TW201421799A - An octa-band and single pole antenna for LTE/WWAN operation - Google Patents

Abstract

An octa-band and single pole antenna for LTE/WWAN operation is suitable for connecting with the ground unit of a electronic device and transmit/receive a antenna signal. It comprises a base board, a first transceiver unit, a second transceiver unit and a third transceiver. Also, these transceiver units set upon the same surface of the base board. Hence, this invention provides a octa-band antenna that could be cover the LTE/WWAN/GSM/UMTS band. At the same time, the area overhead of the invention is almost zero and provide the better radiation efficiency.

Description

Eight-band planar monopole antenna for LTE/WWAN

The invention relates to an antenna applied to LTE/WWAN, in particular to an eight-band planar monopole antenna applied to LTE/WWAN.

With the increasing popularity of wireless communication, today's wireless transmission interface has gradually evolved from the third generation (3G) mobile communication system to the fourth generation (4G) mobile communication system, and the Long Term Evolution (LTE) is the fourth generation. One of the communication protocols for mobile communication systems.

Compared with the Wireless Wide Area Network (WWAN), the Long Term Evolution (LTE) technology has a higher amount of data transmission and is therefore more practical. The operating bandwidth of LTE can be divided into three types: the operating bandwidth of LTE 700 is between 698 and 787 MHz, the operating bandwidth of LTE 2300 is between 2300 and 2400 MHz, and the operating bandwidth of LTE 2500 is between 2,500. Between 2690MHz, since LTE is regarded as the mainstream specification for next-generation mobile communication devices, quite a number of prior technologies have been developed. For example, KLWong et al. have recently proposed in Microwave and Optical Technology Letters. "Simple printed monopole slot antenna for penta-band wireless wide area network operation in the mobile handset", "Surface-mount WWAN monopole slot antenna for mobile handset", "Uniplanar coupled-fed printed PIFA for WWAN operation in the laptop computer" The related literatures all propose an antenna device suitable for WWAN/LTE specifications.

In addition, due to the portable electronic devices such as laptop computers or tablet computers, most of them have built-in antenna devices that can operate at bandwidths such as GSM 850/900/1800/1900/UMTS. The corresponding frequency bands are 824~896MHz, 880~960MHz, 1710~1800MHz, 1850~1990MHz, 1920~2170MHz. Therefore, most developers of portable electronic device products today are all actively planning to adopt LTE/ The WWAN specification is integrated with existing GSM/UMTS to provide a built-in antenna device that supports eight bands (including four GSM bands, three LTE bands, and one UMTS band).

However, the above-mentioned technical methods proposed by KL Wong et al. are mainly based on inverted L-shaped microstrip lines, regardless of antenna area, Radiation Efficiency or frequency band. The radiation efficiency of these technologies is mostly between 60% and 80%, or the coverage of the LTE overall frequency band is not effectively covered, or the antenna area is not small enough. There is still considerable room for improvement, and even within the eight bands, it can be fully supported at this stage. The technology of building antenna devices is almost incomprehensible, so this is still a very important topic for people in related fields.

Therefore, the object of the present invention is to provide an eight-band planar monopole antenna for WWAN/LTE, which is suitable for being electrically connected to a grounding unit of an electronic device for transmitting and receiving an antenna signal, comprising: a substrate; a transceiver unit is disposed on the substrate, and includes: a first line segment for feeding the antenna signal, and the grounding unit Electrically connecting; a second line segment electrically connected to the first line segment and disposed on the substrate in a direction perpendicular to the first line segment; a third line segment electrically connected to one end of the second line segment, and And disposed on the substrate in a direction opposite to the second line segment; and a fourth line segment electrically connected to the other end of the second line segment and disposed on the substrate in a direction perpendicular to the second line segment; a second transceiver unit is disposed on the substrate and coupled to the first transceiver unit, and includes: a coupling component disposed on the substrate and coupled to the first transceiver unit; a fifth line segment, and the coupling component Electrically connecting; a sixth line segment electrically connected to the fifth line segment and disposed on the substrate in a direction perpendicular to the fifth line segment; a seventh line segment parallel to the sixth line segment and spaced apart from the substrate And a first connecting segment electrically connected to the sixth segment and the seventh segment; and a third transceiver unit disposed on the substrate and electrically connected to the second transceiver unit, comprising: an eighth Line segment, and the second transceiver unit Connected, and the seventh line segment parallel to and are spaced apart on the substrate; a ninth line electrically connected to one end of the eighth segment, and to the The eighth line segment is disposed on the substrate in a vertical direction; and a tenth line segment is electrically connected to the other end of the ninth line segment and disposed on the substrate in a direction perpendicular to the ninth line segment; wherein the antenna signal is The first line segment is fed into and coupled to the coupling element, and then transmitted to the eighth line segment via the fifth line segment, the sixth line segment, the first connecting segment and the seventh line segment to radiate.

Thus, the present invention is effective in covering the eight most important frequency bands in the field of current antenna design, while at the same time providing relatively effective radiation efficiency with little additional area cost.

The details of the related patents and the technical contents of the present invention will be apparent from the following detailed description of a preferred embodiment of the drawings.

1 and 2, a preferred embodiment of the present invention is adapted to be electrically connected to a grounding unit 9 of an electronic device for transmitting and receiving an antenna signal, comprising: a substrate 5, a first transceiver unit 6, and a a second transceiver unit 7 and a third transceiver unit 8 , wherein the first, second and third transceiver units 6 , 7 , 8 are disposed on the same plane of the substrate 5 , and preferably, the substrate 5 It is an FR4 substrate (FR4 Substrate) having a dielectric constant ε _r of 4.3 and a loss tangent (Loss Tangent) of 0.02.

The first transceiver unit 6 includes a first line segment 61, a second line segment 62, a third line segment 63, and a fourth line segment 64. The first line segment 61 has a first length L1 and a first width W1 for feeding the antenna signal, and the second line segment 62 is electrically connected to one end of the first line segment 61. Extending in a direction perpendicular to the first line segment 61, the length extending to one side is a second length L2, and the length extending to the other side is a third length L3. Therefore, the second line segment 62 The length is L2+W1+L3, that is, the second line segment 62 and the first line segment 61 are disposed in a T-shape, and the connection point between the first line segment 61 and the second line segment 62 is a boundary. One length of the second line segment 62 is the second length L2, and the other length is the third length L3.

The third line segment 63 and the fourth line segment 64 are respectively electrically connected to one end of the second line segment 62 and disposed in a direction perpendicular to the second line segment 62, wherein the third line segment 63 has a fourth length L4, and the third line segment 63 has a fourth length L4. The fourth line segment 64 has a fifth length L5. The first, second, and third line segments 61, 62, 63 form an inverted U-shaped structure, and the first, second, and fourth line segments 61, 62, 64 also form an inverted U-shaped structure.

It should be noted that the first line segment 61 is electrically connected to the grounding unit 9 by a thin coaxial line segment 90. Preferably, in the preferred embodiment, the resistance of the thin coaxial segment 90 is The value is 50Ω.

Preferably, the second, third, and fourth line segments 62, 63, 64 each have a second width W2.

The second transceiver unit 7 includes a coupling element 71, a fifth line segment 72, a sixth line segment 73, a first connecting portion 74, a seventh line segment 75, and a second connecting portion 76. The coupling element 71 And disposed in the inverted U-shaped structure formed by the first, second, and fourth line segments 61, 62, 64 and having four coupled line segments 711-714 to form a rectangle, wherein a first coupling line segment 711 and the The first line segments 61 are parallel and spaced apart by a first spacing S1, one One end of the second coupling line segment 712 is electrically connected to one end of the first coupling line segment 711 and is parallel and spaced apart from the second line segment 62. One end of a third coupling line segment 713 and the other end of the second coupling line segment 711 Electrically connected, and parallel to the fourth line segment 64 and spaced apart by a second spacing S2, two ends of a fourth coupling line segment 714 are electrically connected to one ends of the first and third coupling line segments 711, 713, respectively, to form A rectangular structure, it is worth noting that the lengths of the first and third coupling line segments 711, 713 are D1, and the lengths of the second and fourth coupling line segments 712, 714 are D2.

One end of the fifth line segment 72 is electrically connected to the junction of the third coupling line segment 713 and the fourth coupling line segment 714, and has a sixth length L6, and one end of the sixth line segment 73 and the fifth line segment 72 One end is electrically connected, and has a seventh length L7. The seventh line segment 75 is parallel to the sixth line segment 73 and spaced apart by a third distance S3. The first connecting portion 74 and the sixth line segment 73, respectively One end of the seven-wire segment 75 is electrically connected. Finally, the second connecting segment 76 is electrically connected to the other end of the seventh segment 75 and extends in a direction perpendicular to the seventh segment 75. The sixth and seventh line segments 73 and 75 and the first connecting portion 74 form an inverted U-shaped structure.

Preferably, the coupled line segments 711-714, the fifth line segment 72, the sixth line segment 73, and the seventh line segment 75 respectively have the second width W2.

The third transceiver unit 8 includes an eighth line segment 81, a ninth line segment 82, and a tenth line segment 83. One end of the eighth line segment 81 is electrically connected to the second connecting portion 76, and the seventh line segment 75 is parallel and spaced apart by a fourth spacing S4, one end of the ninth line segment 82 is electrically connected to the other end of the eighth line segment 81, and extends in a direction perpendicular to the eighth line segment 81, the tenth One end of the line segment 83 is electrically connected to the other end of the ninth line segment 82, and is disposed in a direction parallel to the eighth line segment 81. It should be noted that the eighth line segment 81 has an eighth length L8, and the tenth line segment has a tenth length L10, and the ninth line segment 82 has a length of L9+D3+D4, and the ninth line segment 82 is electrically connected to the eighth line segment 81 to extend a length D3, and the corresponding width is the second width W2, and then continues to extend a ninth length L9, and the corresponding width is a third width W3, and finally continues A length D4 is extended, and the corresponding width is the second width W2. Preferably, the third width W3 is greater than the second width W2.

Preferably, in the preferred embodiment, the length parameters are respectively designed as follows: the first length L1 is 8.6 mm, the second length L2 is 15.5 mm, and the third length L3 is 7.15 mm. The fourth length L4 is 5.4 mm, the fifth length L5 is 6.5 mm, the sixth length L6 is 13.8 mm, the seventh length L7 is 12 mm, the eighth length L8 is 15 mm, and the ninth length L9 is 31 mm. The tenth length L10 is 14 mm, the first width W1 is 1 mm, the second width W2 is 0.5 mm, the third width W3 is 3.4 mm, the first pitch S1 is 0.2 mm, and the second pitch S2 is 0.4 mm. The third pitch S3 is 0.5 mm, the fourth pitch S4 is 0.7 mm, D1 is 7.1 mm, D2 is 5 mm, D3 is 4.5 mm, and D4 is 3.9 mm.

In the preferred embodiment, the length L is 40 mm and the width W is 15 mm, so the overall area is 40×15 mm ² , and for a grounding unit of a 9.7-inch tablet, the area is approximately 200×150 mm ^{2 .} .

In the preferred embodiment, the transmission path of the transceiver antenna signal has three :

1. The antenna signal is fed by the first line segment 61 (point A) and coupled to the coupling element 71 (point H), and then via the fifth line segment 72 (K point), the sixth line segment 73, A connecting section 74, a seventh line segment 75, and a second connecting section 76 are finally radiated through the eighth line segment 81 (point F).

2. The antenna signal is fed by the first line segment 61 (point A), transmitted to the third line segment 63 (point D) via the second line segment 62 (point C), and radiated through the third line segment 63. .

3. The antenna signal is fed by the first line segment 61 (point A), then passes through the thin coaxial line segment 90 to the ground unit 9, and via the eighth line segment 81 (point F), the ninth line segment 82. It is transmitted to the tenth line segment (point E) and radiated.

Referring to FIG. 3, the actual measurement results and computer simulation results of the 3:1 Voltage Standing Wave Radio (VSWR) of the preferred embodiment are observed, that is, the bandwidth performance under the 6 dB reflection loss is measured. The low frequency part is about 262MHz (from 698~960MHz), and the high frequency part is about 1610MHz (from 1540~3150MHz). Therefore, the preferred embodiment can be applied to four GSM bands (824~896MHz, 880~). 960MHz, 1710~1800MHz, 1850~1990MHz), three LTE bands (698~787MHz, 2300~2400MHz, 2500~2690MHz) and one UMTS band (1920~2170MHz)), so this is the preferred implementation. The example can be effectively applied to an antenna device of a new generation of portable electronic devices. In addition, the preferred embodiment has a radiation efficiency of about 85% at low frequencies and a radiation efficiency of about 98% at high frequencies, which is superior to similar ones. previously The technology, and the area is about 40×15mm2, which is not much different from the similar prior art. Therefore, the preferred embodiment can effectively cover the eight most important frequency bands in the current antenna design field, and at the same time, The radiation efficiency is provided at a relatively high cost without additional area cost, so that the above is achieved, and the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

5‧‧‧Substrate

6‧‧‧First transceiver unit

61‧‧‧First line

62‧‧‧second line

63‧‧‧ third line segment

64‧‧‧Fourth line

7‧‧‧second transceiver unit

71‧‧‧Coupling components

711~714‧‧‧coupled line segments

72‧‧‧ fifth line

73‧‧‧ sixth line

74‧‧‧First connection segment

75‧‧‧ seventh line

76‧‧‧Second connection

8‧‧‧3rd transceiver unit

81‧‧‧ eighth line

82‧‧‧ ninth line

83‧‧‧10th line

9‧‧‧ Grounding unit

1 is a schematic diagram of an eight-band planar monopole antenna for LTE/WWAN electrically connected to the grounding unit of the present invention; FIG. 2 is a circuit diagram of the preferred embodiment; and FIG. 3 is a frequency of the preferred embodiment - Reflection loss waveform.

6‧‧‧First transceiver unit

61‧‧‧First line

62‧‧‧second line

63‧‧‧ third line segment

64‧‧‧Fourth line

7‧‧‧second transceiver unit

71‧‧‧Coupling components

711~714‧‧‧coupled line segments

72‧‧‧ fifth line

73‧‧‧ sixth line

74‧‧‧First connection segment

75‧‧‧ seventh line

76‧‧‧Second connection

8‧‧‧3rd transceiver unit

81‧‧‧ eighth line

82‧‧‧ ninth line

83‧‧‧10th line

9‧‧‧ Grounding unit

Claims (8)

An eight-band planar monopole antenna for LTE/WWAN, which is adapted to be electrically connected to a grounding unit of an electronic device for transmitting and receiving an antenna signal, comprising: a substrate; a first transceiver unit disposed on the substrate The method includes: a first line segment for feeding the antenna signal and electrically connected to the grounding unit; a second line segment electrically connected to the first line segment and perpendicular to the first line segment Disposed on the substrate; a third line segment electrically connected to one end of the second line segment, and disposed on the substrate in a direction extending opposite to the second line segment; and a fourth line segment, and the second line segment The other end is electrically connected to the substrate and disposed on the substrate in a direction perpendicular to the second line segment. A second transceiver unit is disposed on the substrate and coupled to the first transceiver unit, and includes: a coupling component disposed on the The substrate is coupled to the first transceiver unit; a fifth line segment is electrically connected to the coupling element; a sixth line segment is electrically connected to the fifth line segment and disposed in a direction perpendicular to the fifth line segment On the substrate; Seven-segment, disposed parallel to and spaced apart on the substrate and the sixth line segment; and a first connection segment is electrically connected to the sixth line segment and the seventh line segment respectively; and a third transceiver unit is disposed on the substrate and electrically connected to the second transceiver unit, and includes: an eighth line segment, and The second transceiver unit is electrically connected to and parallel to the seventh line segment and disposed on the substrate; a ninth line segment is electrically connected to one end of the eighth line segment and disposed in a direction perpendicular to the eighth line segment And the tenth line segment is electrically connected to the other end of the ninth line segment, and is disposed on the substrate in a direction perpendicular to the ninth line segment; wherein the antenna signal is fed by the first line segment And coupled to the coupling element, and then transmitted to the eighth line segment via the fifth line segment, the sixth line segment, the first connecting segment and the seventh line segment to radiate. The eight-band planar monopole antenna applied to the LTE/WWAN according to claim 1, wherein the coupling unit has four coupled line segments, and the coupled line segments are surrounded by a rectangle. The eight-band planar monopole antenna applied to the LTE/WWAN according to claim 2, wherein the coupled line segment, the second line segment, the third line segment, the fourth segment segment, the fifth segment segment, and the sixth segment segment The seventh line segment, the eighth line segment, and the tenth line segment respectively have a second width. The eight-band planar monopole antenna for LTE/WWAN according to claim 1, wherein the first line segment has a first width. The eight-band planar monopole antenna applied to the LTE/WWAN according to claim 1, wherein the second line segment, the third line segment, the fourth line segment, the fifth segment segment, the sixth segment segment, and the seventh segment segment, The eighth line segment and the tenth line segment respectively have a second width. The eight-band planar monopole antenna for LTE/WWAN according to claim 1, wherein the ninth line segment has a second width and a third width, and the third width is greater than the second width. . An eight-band planar monopole antenna for use in an LTE/WWAN according to claim 6, wherein a length of the ninth line segment and the eighth line segment are electrically connected to each other, and the width is the second width. And extending another length with the ninth line segment electrically connected to the tenth line segment, the width is the second width, the remaining portion of the ninth line segment is a ninth length, and the corresponding width is the third width . The eight-band planar monopole antenna applied to the LTE/WWAN according to claim 1, wherein the first line segment is electrically connected to the ground unit by a thin coaxial line segment.