TWI774281B - Antenna system - Google Patents

Abstract

An antenna system includes a first antenna, a second antenna, and a third antenna. The third antenna is disposed between the first antenna and the second antenna. Both the first antenna and the second antenna operate in a first frequency band. The third antenna operates in a second frequency band which is different from the first frequency band. The first antenna, the second antenna, and the third antenna are disposed on the same plane. The first antenna includes a first ground plane, a first feeding connection element, a first radiation element, and a first shorting element. The third antenna includes a third ground plane, a third feeding connection element, a third radiation element, a fourth radiation element, and a third shorting element

Description

Antenna system

The present invention relates to an antenna system (Antenna System), in particular to an antenna system capable of improving isolation (Isolation).

With the development of mobile communication technology, mobile devices have become more and more common in recent years, such as laptop computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-distance wireless communication range, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and their frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz for communication, While some cover short-range wireless communication range, for example: Wi-Fi, Bluetooth systems use the 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

Antenna System is an indispensable component in mobile devices supporting wireless communication. However, due to the small space inside the mobile device, the antennas are often arranged very close together, and are prone to interfere with each other. Therefore, it is necessary to design a new antenna system to improve the problem of poor isolation in the conventional antenna system.

In a preferred embodiment, the present invention provides an antenna system, comprising: a first antenna; a second antenna; and a third antenna, interposed between the first antenna and the second antenna; The first antenna and the second antenna both operate in a first frequency band, and the third antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, the second antenna The antenna and the third antenna are all arranged on the same plane; wherein the first antenna includes: a first ground plane; a first feeding connection part with a first feeding point; a first radiating part , coupled to the first feed-in connection portion; and a first short-circuit portion, wherein the first feed-in connection portion is coupled to the first ground plane through the first short-circuit portion; wherein the third antenna includes: a third ground plane; a third feed-in connection part with a third feed-in point; a third radiator part coupled to the third feed-in connection part; a fourth radiator part coupled to the first feed-in connection part three feed-in connection parts; and a third short-circuit part, wherein the third feed-in connection part is coupled to the third ground plane through the third short-circuit part.

In some embodiments, the distance between the first antenna and the third antenna is greater than or equal to 5 mm, and the distance between the second antenna and the third antenna is greater than or equal to 5 mm.

In some embodiments, the first frequency band covers a first frequency interval between 2400MHz and 2500MHz, and a second frequency interval between 4800MHz and 6000MHz, wherein the second frequency band covers the interval A third frequency interval between 680MHz and 960MHz, a fourth frequency interval between 1700MHz and 2200MHz, and a fifth frequency interval between 2500MHz and 2700MHz.

In some embodiments, the first short-circuit portion is surrounded by the first ground plane, the first feed-in connection portion, and the first radiation portion.

In some embodiments, a combination of the first feed-in connection portion and the first radiating portion presents an inverted U-shape.

In some embodiments, the first feed-in connection part, the first radiation part, and the first short-circuit part are jointly excited to generate the first frequency range, and the first feed-in connection part and the first short-circuit part Partial co-excitation produces the second frequency interval.

In some embodiments, the second antenna includes: a second ground plane; a second feed-in connection portion having a second feed-in point; a second radiator portion coupled to the second feed-in connection part; and a second short-circuit part, wherein the second feed-in connection part is coupled to the second ground plane through the second short-circuit part.

In some embodiments, the second short-circuit portion is surrounded by the second ground plane, the second feed-in connection portion, and the second radiation portion.

In some embodiments, a combination of the second feed-in connection portion and the second radiating portion presents an inverted U-shape.

In some embodiments, the second short-circuit portion has an inverted L-shape.

In some embodiments, the second feed-in connection part, the second radiation part, and the second short-circuit part are jointly excited to generate the first frequency range, and the second feed-in connection part and the second short-circuit part Partial co-excitation produces the second frequency interval.

In some embodiments, the fourth radiating portion is surrounded by the third feeding connection portion, the third radiating portion, and the third short-circuiting portion.

In some embodiments, the fourth radiating portion further includes a rectangular widening portion at an end.

In some embodiments, the third radiating portion presents an inverted U-shape.

In some embodiments, the third short-circuit portion has an inverted U-shape.

In some embodiments, the third feeding connection part, the third radiating part, and the third short circuit part are jointly excited to generate the third frequency range, wherein the third feeding connecting part and the fourth radiating part , and the third short-circuit part is co-excited to generate the fourth frequency range, and the third feed-in connection part and the third short-circuit part are co-excited to generate the fifth frequency range.

In another preferred embodiment, the present invention provides an antenna system, comprising: a first antenna; a second antenna; and a third antenna, interposed between the first antenna and the second antenna between; wherein both the first antenna and the second antenna operate in a first frequency band, and the third antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, The second antenna and the third antenna are all disposed on the same plane; wherein the third antenna includes: a ground plane; a feeding connection part with a feeding point; a first sub-radiating part, coupled to to the feed-in connection part; a second sub-radiation part coupled to the feed-in connection part, wherein the second sub-radiation part further includes a rectangular widened portion at the end; and a short-circuit part, wherein the feed-in connection The part is coupled to the ground plane through the short-circuit part.

In some embodiments, the first frequency band covers a first frequency interval between 2400MHz and 2500MHz, and a second frequency interval between 4800MHz and 6000MHz, wherein the second frequency band covers the interval A third frequency interval between 680MHz and 960MHz, a fourth frequency interval between 1700MHz and 2200MHz, and a fifth frequency interval between 2500MHz and 2700MHz.

In some embodiments, the second sub-radiation portion is surrounded by the feed-in connection portion, the radiation portion, and the short-circuit portion.

In some embodiments, the first sub-radiation portion has an inverted U-shape.

In some embodiments, the short-circuit portion has an inverted U-shape.

In another preferred embodiment, the present invention provides an antenna system, comprising: a first antenna; a second antenna; and a third antenna interposed between the first antenna and the second antenna between; wherein both the first antenna and the second antenna operate in a first frequency band, and the third antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, the The second antenna and the third antenna are all disposed on the same plane; wherein the third antenna includes: a ground plane; a feeding connection part with a feeding point; a first sub-radiating part, coupled to the the feed-in connection part; a second sub-radiation part coupled to the feed-in connection part, wherein the first sub-radiation part presents an inverted U-shape; and a short-circuit part, wherein the feed-in connection part passes through the feed-in connection part The short-circuit portion is coupled to the ground plane.

In another preferred embodiment, the present invention provides an antenna system, comprising: a first antenna; a second antenna; and a third antenna interposed between the first antenna and the second antenna between; wherein both the first antenna and the second antenna operate in a first frequency band, and the third antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, the The second antenna and the third antenna are all disposed on the same plane; wherein the third antenna includes: a ground plane; a feeding connection part with a feeding point; a first sub-radiating part, coupled to the the feed-in connection part; a second sub-radiation part coupled to the feed-in connection part, wherein the first sub-radiation part presents an inverted U shape; and a short-circuit part, wherein the short-circuit part presents an inverted U shape and the feed-in connection portion is coupled to the ground plane through the short-circuit portion.

In order to make the objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are given in the following, and are described in detail as follows in conjunction with the accompanying drawings.

Certain terms are used throughout the specification and claims to refer to particular elements. It should be understood by those skilled in the art that hardware manufacturers may refer to the same element by different nouns. This specification and the scope of the patent application do not use the difference in name as a way to distinguish elements, but use the difference in function of the elements as a criterion for distinguishing. The words "including" and "including" mentioned in the entire specification and the scope of the patent application are open-ended terms, so they should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. Furthermore, the term "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connecting means. Second device.

FIG. 1 is a schematic diagram of an antenna system 100 according to an embodiment of the present invention. As shown in FIG. 1, the antenna system 100 includes a first antenna 110, a second antenna 120, and a third antenna 130, wherein the third antenna 130 is approximately between the first antenna 110 and the second antenna between lines 120. In a preferred embodiment, both the first antenna 110 and the second antenna 120 operate in a first frequency band, and the third antenna 130 operates in a second frequency band that is completely different from the first frequency band . For example, the first antenna 110, the second antenna 120, and the third antenna 130 can all be disposed on the same plane or on the same straight line. The distance D1 between the first antenna 110 and the third antenna 130 may be greater than or equal to 5 mm, and the distance D2 between the second antenna 120 and the third antenna 130 may also be greater than or equal to 5 mm. Since the third antenna 130 has different resonant frequencies, this design can prevent the third antenna 130 from causing interference to the first antenna 110 and the second antenna 120, thereby enhancing the first antenna 110, the second antenna 120, and the Isolation between any two of the third antennas 130 . In addition, by designing the third antenna 130 in the gap between the first antenna 110 and the second antenna 120, the overall size of the antenna system 100 can be further reduced.

In some embodiments, the aforementioned first frequency band is a WLAN (Wireless Local Area Networks) band, and the aforementioned second frequency band is a WWAN (Wireless Wide Area Network) band. Specifically, the aforementioned first frequency band may cover a first frequency interval between 2400MHz and 2500MHz, and a second frequency interval between 4800MHz and 6000MHz, and the aforementioned second frequency band A third frequency interval between 680MHz and 960MHz, a fourth frequency interval between 1700MHz and 2200MHz, and a fifth frequency interval between 2500MHz and 2700MHz can be covered. Therefore, the antenna system 100 can support at least broadband operation of WLAN and WWAN, but not limited thereto.

The following embodiments will introduce the detailed structure of the antenna system 100 . It must be understood that these drawings and descriptions are only examples and are not intended to limit the present invention.

FIG. 2 shows a schematic diagram of an antenna system 200 according to an embodiment of the present invention. As shown in FIG. 2, the antenna system 200 includes a first antenna 300, a second antenna 400, and a third antenna 500, wherein the third antenna 500 is interposed between the first antenna 300 and the second antenna between 400. Both the first antenna 300 and the second antenna 400 can operate in the aforementioned first frequency band (eg, WLAN frequency band), while the third antenna 500 can operate in the aforementioned second frequency band (eg, WWAN frequency band). In some embodiments, the antenna system 200 further includes a dielectric substrate (Dielectric Substrate) 210, such as: a FR4 (Flame Retardant 4) substrate, a printed circuit board (Printed Circuit Board, PCB), or a flexible circuit board ( Flexible Circuit Board, FCB), wherein the first antenna 300 , the second antenna 400 , and the third antenna 500 are at least partially disposed on the dielectric substrate 210 .

The first antenna 300 includes a first ground plane 310 , a first Feeding Connection Element 320 , a first Radiation Element 330 , and a first Shorting Element) 340. The aforementioned elements of the first antenna 300 can be made of metal materials. The first ground plane 310 may be a ground copper foil (Ground Copper Foil) extending to the dielectric substrate 210, and the first feed-in connection portion 320, the first radiation portion 330, and the first short-circuit portion 340 are all disposed on on the dielectric substrate 210 . The first feed-in connection portion 320 may be approximately a rectangle. The first feeding connection part 320 has a first end 321 and a second end 322 , wherein a first feeding point (Feeding Point) FP1 is located at the first end 321 of the first feeding connection part 320 . The first feeding point FP1 may further be coupled to a first signal source (not shown). For example, the first signal source can be a first radio frequency (RF) module, which can be used to excite the first antenna 300 . The first radiating portion 330 may substantially present an inverted L shape. A combination of the first feed-in connection portion 320 and the first radiation portion 330 may substantially present an inverted U-shape. The first radiating part 330 has a first end 331 and a second end 332 , wherein the first end 331 of the first radiating part 330 is coupled to the second end 322 of the first feeding connecting part 320 , and the first radiating The second end 332 of the portion 330 is an open end and extends toward the direction close to the first ground plane 310 . The first short-circuit portion 340 may approximately have an inverted L-shape. The first short circuit portion 340 has a first end 341 and a second end 342 , wherein the first end 341 of the first short circuit portion 340 is coupled to the first ground plane 310 , and the second end 342 of the first short circuit portion 340 It is coupled to a first connection point (Connection Point) CP1 on the first feed-in connection part 320 , so that the first feed-in connection part 320 is coupled to the first ground plane 310 through the first short-circuit part 340 . The first short-circuit portion 340 is surrounded by the first ground plane 310 , the first feed-in connection portion 320 , and the first radiation portion 330 . A first gap (Gap) G1 is formed between the first radiation portion 330 and the first short-circuit portion 340 , and a second gap G2 is formed between the first short-circuit portion 340 and the first ground plane 310 . The width is greater than the width of the first gap G1. In addition, the width W1 of the first feed connection portion 320 is larger than the width of the first radiation portion 330 and the width of the first short circuit portion 340 , and this design can increase the high frequency operating bandwidth of the first antenna 300 .

The principle of operation and component dimensions of the first antenna 300 may be as follows. The first feed connection portion 320 , the first radiation portion 330 , and the first short-circuit portion 340 are jointly excited to generate the aforementioned first frequency range (eg, 2400MHz to 2500MHz). The first feed connection portion 320 and the first short circuit portion 340 are jointly excited to generate the aforementioned second frequency range (eg, 4800MHz to 6000MHz). The total length of the first feed connection portion 320, the first radiation portion 330, and the first short-circuit portion 340 (for example, from the first end 341, through the first connection point CP1 and the first end 331, and then to the second end 332) may be approximately equal to 0.25 wavelengths (λ/4) of the center frequency of the first frequency interval. The total length of the first feed connection portion 320 and the first short-circuit portion 340 (for example, the total length from the first end 341, through the first connection point CP1, and then to the second end 322) may be approximately equal to the second frequency range 0.25 times the wavelength (λ/4) of the center frequency. The width W1 of the first feeding connection portion 320 may be between 2.9 mm and 3.5 mm (eg, 3.2 mm). The width of the first gap G1 may be between 1.3 mm and 1.7 mm (eg, 1.5 mm). The width of the second gap G2 may be between 1.5 mm and 2.3 mm (eg, 1.9 mm). The above size ranges are obtained according to multiple experimental results, which help to optimize the operation bandwidth and impedance matching of the first antenna 300 .

The second antenna 400 includes a second ground plane 410 , a second feed connection portion 420 , a second radiation portion 430 , and a second short-circuit portion 440 . The aforementioned elements of the second antenna 400 can be made of metal materials. The second ground plane 410 can be a ground copper foil, which extends to the dielectric substrate 210 , and the second feed connection portion 420 , the second radiation portion 430 , and the second short circuit portion 440 are all disposed on the dielectric substrate 210 . The second feed-in connection portion 420 may be approximately in a U-shape, an H-shape, or a rectangle. The second feeding connection part 420 has a first end 421 and a second end 422 , wherein a second feeding point FP2 is located at the first end 421 of the second feeding connection part 420 . The second feeding point FP2 can further be coupled to a second signal source (not shown). For example, the second signal source can be a second radio frequency module, which can be used to excite the second antenna 400 . The second radiating portion 430 may substantially present an inverted L-shape. A combination of the second feed-in connection portion 420 and the second radiation portion 430 may substantially present an inverted U-shape. The second radiating part 430 has a first end 431 and a second end 432 , wherein the first end 431 of the second radiating part 430 is coupled to the second end 422 of the second feeding connection part 420 , and the second radiating The second end 432 of the portion 430 is an open end and extends toward the direction close to the second ground plane 410 . The second short-circuit portion 440 may approximately have an inverted L-shape. The second short circuit portion 440 has a first end 441 and a second end 442 , wherein the first end 441 of the second short circuit portion 440 is coupled to the second ground plane 410 , and the second end 442 of the second short circuit portion 440 is coupled to a second connection point CP2 on the second feed-in connection part 420 , so that the second feed-in connection part 420 is coupled to the second ground plane 410 through the second short-circuit part 440 . The second short circuit portion 440 is surrounded by the second ground plane 410 , the second feed connection portion 420 , and the second radiation portion 430 . A third gap G3 is formed between the second radiation portion 430 and the second short circuit portion 440 , and a fourth gap G4 is formed between the second short circuit portion 440 and the second ground plane 410 , wherein the width of the fourth gap G4 is greater than The width of the third gap G3. In addition, the width W2 of the second feed connection portion 420 is greater than the width of the second radiation portion 430 and the width of the second short circuit portion 440 , and this design can increase the high frequency operating bandwidth of the second antenna 400 .

The principle of operation and component dimensions of the second antenna 400 may be as follows. The second feed connection portion 420 , the second radiation portion 430 , and the second short circuit portion 440 are jointly excited to generate the aforementioned first frequency range (eg, 2400MHz to 2500MHz). The second feed connection portion 420 and the second short circuit portion 440 are jointly excited to generate the aforementioned second frequency range (eg, 4800MHz to 6000MHz). The total length of the second feed connection portion 420, the second radiation portion 430, and the second short-circuit portion 440 (for example, from the first end 441, through the second connection point CP2 and the first end 431, and then to the second end 432) may be approximately equal to 0.25 wavelengths (λ/4) of the center frequency of the first frequency interval. The total length of the second feed-in connection portion 420 and the second short-circuit portion 440 (for example, the total length from the first end 441, through the second connection point CP2, and then to the second end 422) may be approximately equal to the second frequency range 0.25 times the wavelength (λ/4) of the center frequency. The width W2 of the second feeding connection portion 420 may be between 3.1 mm and 3.7 mm (eg, 3.4 mm). The width of the third gap G3 may be between 1 mm and 1.4 mm (eg, 1.2 mm). The width of the fourth gap G4 may be between 1.6 mm and 2.2 mm (eg, 1.9 mm). The above size ranges are obtained based on multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the second antenna 400 .

The third antenna 500 includes a third ground plane 510 , a third feed connection portion 520 , a third radiation portion 530 , a fourth radiation portion 540 , and a third short circuit portion 550 . The aforementioned elements of the third antenna 500 can be made of metal materials. The third ground plane 510 can be a ground copper foil, which extends to the dielectric substrate 210 , and the third feed connection portion 520 , the third radiation portion 530 , the fourth radiation portion 540 , and the third short circuit portion 550 are all provided on the dielectric substrate 210 . The third feed-in connection portion 520 may be roughly in the shape of a straight bar with unequal width. The third feed-in connection part 520 has a first end 521 and a second end 522 , wherein the width of the second end 522 of the third feed-in connection part 520 is greater than the width of the first end 521 of the third feed-in connection part 520 width, and a third feeding point FP3 is located at the first end 521 of the third feeding connecting portion 520 . The third feeding point FP3 can further be coupled to a third signal source (not shown). For example, the third signal source can be a third radio frequency module, which can be used to excite the third antenna 500 . The third radiating portion 530 may substantially present an inverted U-shape. The third radiating part 530 has a first end 531 and a second end 532 , wherein the first end 531 of the third radiating part 530 is coupled to the second end 522 of the third feeding connection part 520 , and the third radiating The second end 532 of the portion 530 is an open end and extends toward the direction close to the third short-circuit portion 550 . The width of the first end 531 of the third radiation portion 530 may be greater than the width of the second end 532 of the third radiation portion 530 . The fourth radiating part 540 may be roughly in the shape of a straight bar. The fourth radiating part 540 has a first end 541 and a second end 542 , wherein the first end 541 of the fourth radiating part 540 is coupled to a third connection point CP3 on the third feeding connection part 520 , and The second end 542 of the fourth radiation portion 540 is an open end. In some embodiments, the fourth radiating portion 540 further includes a rectangular widened portion 545 at the end, so that the width W3 of the second end 542 of the fourth radiating portion 540 is greater than the width W3 of the first end 541 of the fourth radiating portion 540 , this design can increase the IF operating bandwidth of the third antenna 500 . The fourth radiating portion 540 is surrounded by the third feeding connection portion 520 , the third radiating portion 530 , and the third short-circuiting portion 550 . The third short-circuit portion 550 may be approximately in an inverted U-shape, wherein the third feed point FP3 may be located in a notch region (Notch Region) 556 defined by the third short-circuit portion 550 . The third short-circuit portion 550 has a first end 551 and a second end 552 , wherein the first end 551 of the third short-circuit portion 550 is coupled to the third ground plane 510 , and the second end 552 of the third short-circuit portion 550 is coupled to a fourth connection point CP4 on the third feed-in connection part 520 , so that the third feed-in connection part 520 is coupled to the third ground plane 510 through the third short-circuit part 550 . In some embodiments, the third short-circuit portion 550 further includes a central rectangular widened portion 555, and the width W4 of the central rectangular widened portion 555 is greater than the width of the rest of the third short-circuit portion 550, so as to fine-tune the third short-circuit portion 550. The impedances of the three antennas 500 are matched. A fifth gap G5 is formed between the third radiating part 530 and the third feeding connection part 520 , and a sixth gap G6 is formed between the fourth radiating part 540 and the third short-circuiting part 550 , wherein the width of the fifth gap G5 is is larger than the width of the sixth gap G6.

The principle of operation and component dimensions of the third antenna 500 may be as follows. The third feed connection portion 520 , the third radiation portion 530 , and the third short circuit portion 550 are jointly excited to generate the aforementioned third frequency range (eg, 680MHz to 960MHz). The third feed connection portion 520 , the fourth radiation portion 540 , and the third short circuit portion 550 are jointly excited to generate the aforementioned fourth frequency range (eg, 1700MHz to 2200MHz). The third feeding connection portion 520 and the third short-circuiting portion 550 are jointly excited to generate the aforementioned fifth frequency range (eg, 2500MHz to 2700MHz). The total length of the third feed connection portion 520, the third radiation portion 530, and the third short circuit portion 550 (for example, from the first end 551, through the fourth connection point CP4 and the first end 531, and then to the second end 532) may be approximately equal to 0.25 wavelengths (λ/4) of the center frequency of the third frequency interval. The total length of the third feed connection part 520, the fourth radiation part 540, and the third short circuit part 550 (for example, from the first end 551, through the fourth connection point CP4 and the third connection point CP3, and then to the second The total length of the ends 542) may be approximately equal to 0.25 wavelengths (λ/4) of the center frequency of the fourth frequency interval. The total length of the third feed-in connection portion 520 and the third short-circuit portion 550 (for example, the total length from the first end 551, through the fourth connection point CP4, and then to the second end 522) may be greater than or equal to the fifth frequency 0.25 times the wavelength (λ/4) of the center frequency of the interval. The width W3 of the rectangular widened portion 545 at the end of the fourth radiating portion 540 may be between 2.3 mm and 2.9 mm (eg, 2.6 mm). The width W4 of the central rectangular widened portion 555 of the third short-circuit portion 550 may be between 5 mm and 5.6 mm (eg, 5.3 mm). The width of the fifth gap G5 may be between 2.9 mm and 3.5 mm (eg, 3.2 mm). The width of the sixth gap G6 may be between 0.5 mm and 0.9 mm (eg, 0.7 mm). The above size ranges are obtained based on multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the third antenna 500 .

In some embodiments, the main beam (Main Beam) of the first antenna 300 is directed to a first direction (for example: -Y axis direction), and the main beam of the second antenna 400 is directed to a first direction perpendicular to the first direction Two directions (eg: +X axis direction), and the main beam of the third antenna 500 is directed to a third direction (eg: +Y axis direction) opposite to the first direction, so that the space diversity gain of the antenna system 200 can be improved. (Spatial Diversity Gain). In order to improve the isolation between the antennas, the distance D3 between the first antenna 300 and the third antenna 500 can be greater than or equal to 5 mm, and the distance D4 between the second antenna 400 and the third antenna 500 can also be greater than or equal to 5mm. The distance D6 between the second ground plane 410 and the third ground plane 510 may be much greater than the distance D5 between the first ground plane 310 and the third ground plane 510 . For example, the aforementioned distance D6 may be more than 5 times the aforementioned distance D5 to further reduce the interference between the second antenna 400 and the third antenna 500 .

FIG. 3A shows an isolation diagram between the first antenna 300 and the third antenna 500 according to an embodiment of the present invention. FIG. 3B shows an isolation diagram between the second antenna 400 and the third antenna 500 according to an embodiment of the present invention. FIG. 3C shows an isolation diagram between the first antenna 300 and the second antenna 400 according to an embodiment of the present invention. According to the measurement results in Figures 3A, 3B, and 3C, within the extremely wide operating bandwidth of 600MHz to 6000MHz, the difference between any two of the first antenna 300, the second antenna 400, and the third antenna 500 The isolation can be greater than 17dB (or its S21 parameter is less than -17dB), which can already meet the practical application requirements of general antenna systems.

The present invention proposes a novel antenna system. By inserting a different-frequency antenna between two same-frequency antennas, the present invention can achieve the dual advantages of improving the isolation of the antenna system and reducing the overall size of the antenna system. It is very suitable for use in various miniaturized mobile communication devices.

It is worth noting that the above-mentioned component size, component shape, and frequency range are not limitations of the present invention. Antenna designers can adjust these settings according to different needs. The antenna system of the present invention is not limited to the state illustrated in FIGS. 1-3. The present invention may include only any one or more of the features of any one or more of the embodiments of Figures 1-3. In other words, not all of the features shown in the figures must be simultaneously implemented in the antenna system of the present invention.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., do not have a sequential relationship with each other, and are only used to mark and distinguish two identical different elements of the name.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

100,200: Antenna System 110,300: First Antenna 120,400: Second Antenna 130,500: Third Antenna 210: Dielectric Substrate 310: First ground plane 320: first feed-in connection 321: the first end of the first feed-in connection 322: the second end of the first feed-in connection 330: First Radiation Division 331: The first end of the first radiation part 332: The second end of the first radiation part 340: The first short circuit 341: The first end of the first short-circuit part 342: The second end of the first short circuit 410: Second ground plane 420: Second feed-in connection 421: the first end of the second feed-in connection 422: the second end of the second feed-in connection 430: Second Radiation Department 431: The first end of the second radiation part 432: The second end of the second radiation part 440: Second short circuit 441: The first end of the second short circuit 442: The second end of the second short circuit 510: Third ground plane 520: Third feed-in connection 521: the first end of the third feed-in connection 522: the second end of the third feed-in connection 530: Third Radiation Division 531: The first end of the third radiating part 532: The second end of the third radiating part 540: Fourth Radiation Division 541: The first end of the fourth radiant 542: The second end of the fourth radiant 545: Rectangular widening part at the end of the fourth radiating part 550: The third short circuit 551: The first end of the third short circuit 552: The second end of the third short-circuit part 555: The central rectangular widened part of the third short-circuit part 556: Gap area of the third short circuit CP1: First connection point CP2: Second connection point CP3: Third connection point CP4: Fourth connection point D1, D2, D3, D4, D5, D6: distance FP1: First Feed Point FP2: Second Feed Point FP3: Third Feed Point G1: first gap G2: Second Gap G3: Third Gap G4: Fourth Gap G5: Fifth Gap G6: Sixth Gap W1,W2,W3,W4: width X: X axis Y: Y axis Z: Z axis

FIG. 1 shows a schematic diagram of an antenna system according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing an antenna system according to an embodiment of the present invention. FIG. 3A shows an isolation diagram between the first antenna and the third antenna according to an embodiment of the present invention. FIG. 3B shows an isolation diagram between the second antenna and the third antenna according to an embodiment of the present invention. FIG. 3C shows an isolation diagram between the first antenna and the second antenna according to an embodiment of the present invention.

100: Antenna System

110: The first antenna

120: The second antenna

130: The third antenna

D1, D2: distance

Claims (21)

An antenna system, comprising: a first antenna; a second antenna; and a third antenna, interposed between the first antenna and the second antenna; wherein the first antenna and the second antenna The antennas all operate in a first frequency band, and the third antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, the second antenna, and the third antenna are all set on the same plane; wherein the first antenna includes: a first ground plane; a first feed-in connection part with a first feed-in point; a first radiation part coupled to the first feed-in connection part; and a first short-circuit part, wherein the first feed-in connection part is coupled to the first ground plane through the first short-circuit part; wherein the third antenna includes: a third ground plane; a third feeder The input connecting part has a third feeding point; a third radiating part is coupled to the third feeding connecting part; a fourth radiating part is coupled to the third feeding connecting part; and a third a short-circuit part, wherein the third feed-in connection part is coupled to the third ground plane through the third short-circuit part; wherein the first frequency band covers a first frequency range between 2400MHz and 2500MHz, and the medium A second frequency between 4800MHz and 6000MHz interval, and wherein the second frequency band covers a third frequency interval between 680MHz and 960MHz, a fourth frequency interval between 1700MHz and 2200MHz, and a fifth frequency interval between 2500MHz and 2700MHz frequency interval. The antenna system of claim 1, wherein the distance between the first antenna and the third antenna is greater than or equal to 5 mm, and the distance between the second antenna and the third antenna is greater than or equal to 5 mm. The antenna system of claim 1, wherein the first short-circuit portion is surrounded by the first ground plane, the first feed-in connection portion, and the first radiation portion. The antenna system of claim 1, wherein a combination of the first feeding connection portion and the first radiating portion presents an inverted U-shape. The antenna system of claim 1, wherein the first feed-in connection part, the first radiation part, and the first short-circuit part are jointly excited to generate the first frequency range, and wherein the first feed-in connection part and the The first short-circuit part is jointly excited to generate the second frequency range. The antenna system of claim 1, wherein the second antenna comprises: a second ground plane; a second feeding connection part having a second feeding point; a second radiating part coupled to the second a feed-in connection part; and a second short-circuit part, wherein the second feed-in connection part is coupled to the second ground plane through the second short-circuit part. The antenna system of claim 6, wherein the second short-circuit portion is surrounded by the second ground plane, the second feed-in connection portion, and the second radiation portion. The antenna system of claim 6, wherein a combination of the second feeding connection portion and the second radiating portion presents an inverted U-shape. The antenna system of claim 6, wherein the second short-circuit portion presents an inverted L-shape. The antenna system of claim 6, wherein the second feeding connection part, the second radiating part, and the second short-circuit part are jointly excited to generate the first frequency range, and wherein the second feeding connection part and the The second short-circuit part is jointly excited to generate the second frequency range. The antenna system of claim 1, wherein the fourth radiating portion is surrounded by the third feeding connection portion, the third radiating portion, and the third short-circuiting portion. The antenna system of claim 1, wherein the fourth radiating portion further comprises an end rectangular widening portion. The antenna system of claim 1, wherein the third radiating portion presents an inverted U-shape. The antenna system of claim 1, wherein the third short-circuit portion presents an inverted U-shape. The antenna system of claim 1, wherein the third feeding connection part, the third radiating part, and the third short-circuit part are jointly excited to generate the third frequency range, wherein the third feeding connection part, the third The four radiating parts and the third short-circuit part are jointly excited to generate the fourth frequency range, and the third feed-in connection part and the third short-circuit part are jointly excited to generate the fifth frequency range. An antenna system, comprising: a first antenna; a second antenna; and a third antenna, interposed between the first antenna and the second antenna; wherein the first antenna and the second antenna The antennas all operate in a first frequency band, and the third The antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, the second antenna, and the third antenna are all arranged on the same plane; wherein the third antenna includes: a connection ground; a feed-in connection part with a feed-in point; a first sub-radiation part, coupled to the feed-in connection part; a second sub-radiation part, coupled to the feed-in connection part, wherein the second sub-radiation part The sub-radiation portion further includes a rectangular widened portion at an end; and a short-circuit portion, wherein the feed connection portion is coupled to the ground plane through the short-circuit portion; wherein the first frequency band covers between 2400MHz and 2500MHz a first frequency interval, and a second frequency interval between 4800MHz and 6000MHz, wherein the second frequency band covers a third frequency interval between 680MHz and 960MHz, a frequency interval between 1700MHz and 2200MHz a fourth frequency interval between 2500MHz and 2700MHz, and a fifth frequency interval between 2500MHz and 2700MHz. The antenna system of claim 16, wherein the second sub-radiation portion is surrounded by the feed connection portion, the radiation portion, and the short-circuit portion. The antenna system of claim 16, wherein the first sub-radiating portion presents an inverted U-shape. The antenna system of claim 16, wherein the short-circuit portion presents an inverted U-shape. An antenna system, comprising: a first antenna; a second antenna; and a third antenna interposed between the first antenna and the second antenna; wherein both the first antenna and the second antenna operate in a first frequency band, and the third antenna operates in the same A second frequency band different from the first frequency band, wherein the first antenna, the second antenna, and the third antenna are all arranged on the same plane; wherein the third antenna includes: a ground plane; a feed The connecting part has a feeding point; a first sub-radiating part is coupled to the feeding connecting part; a second sub-radiating part is coupled to the feeding connecting part, wherein the first sub-radiating part presents an inverted U-shape; and a short-circuit portion, wherein the feed-in connection portion is coupled to the ground plane through the short-circuit portion; wherein the first frequency band covers a first frequency range between 2400MHz and 2500MHz, and a second frequency interval between 4800MHz and 6000MHz, and wherein the second frequency band covers a third frequency interval between 680MHz and 960MHz and a fourth frequency interval between 1700MHz and 2200MHz, and a fifth frequency range between 2500MHz and 2700MHz. An antenna system, comprising: a first antenna; a second antenna; and a third antenna, interposed between the first antenna and the second antenna; wherein the first antenna and the second antenna The antennas all operate in a first frequency band, and the third antenna operates in a second frequency band different from the first frequency band, wherein the first antenna, the second antenna, and the third antenna are all set on the same plane; The third antenna includes: a ground plane; a feed-in connection part with a feed-in point; a first sub-radiation part, coupled to the feed-in connection part; a second sub-radiation part, coupled to the feed-in connection part a feed-in connection portion, wherein the first sub-radiation portion presents an inverted U-shape; and a short-circuit portion, wherein the short-circuit portion presents an inverted U-shape, and the feed-in connection portion is coupled to the short-circuit portion through the short-circuit portion ground plane; wherein the first frequency band covers a first frequency interval between 2400MHz and 2500MHz, and a second frequency interval between 4800MHz and 6000MHz, and wherein the second frequency band covers between 680MHz A third frequency range to 960MHz, a fourth frequency range to range from 1700MHz to 2200MHz, and a fifth frequency range to range from 2500MHz to 2700MHz.

Images