TWI484697B - Antenna module and dual-band antenna - Google Patents

Description

Antenna module and dual-frequency antenna

The present invention relates to a wireless signal transmission dual frequency antenna; in particular, a wireless signal transmission dual frequency antenna for the IEEE 802.11 standard.

With the evolution of technology, human technology in wireless communications has continued to improve. In recent years, various wireless communication network technologies and standards have been continuously updated, and the amount of wireless data transmission has been greatly increased. For example, the Wi-Fi wireless network standard defined by the International Institute of Electrical Engineers (IEEE) in the 802.11 standard, and the recent Worldwide Interoperability for Microwave Access (WiMax) standard defined by the 802.16 standard.

In order to cope with the improvement of wireless communication network technology, the dual-band antenna used for wireless signal transmission and reception must also be improved in order to cooperate with new technologies. FIG. 1 shows a conventional antenna module 10 for a wireless network portable dual-band antenna (WiFi USB Dongle). As shown in FIG. 1 , the conventional antenna module 10 includes a conventional dual-frequency antenna 20 , wherein the dual-frequency antenna 20 further includes a radiator 21 and a signal feeding portion 22 . As shown in FIG. 1, the radiator 21 and the signal feeding portion 22 are connected to the metal ground layer 23, wherein the signal is input through the signal feeding portion 22 in a direct feeding manner to excite the radiator 21 to generate a high frequency mode and a low frequency mode. The operating center frequencies of the above high frequency mode and low frequency mode generally fall at 5.2 GHz and 2.4 GHz, respectively.

The conventional dual frequency antenna 20 described above typically requires a length of approximately 20 mm and a width of 7 mm to efficiently transmit and receive wireless signals. However, the conventional antenna module 10 will inevitably occupy a large printed circuit board space of the wireless network portable dual frequency antenna. As a result, the conventional antenna module 10 will increase the cost of the printed circuit board and increase the appearance of the product, thus failing to meet the current miniaturization of electronic products. It can be seen that how to reduce the overall volume and area of the antenna module while maintaining the performance requirements of wireless signal transmission is one of the important topics of the current antenna module.

It is an object of the present invention to provide a miniaturized antenna module for space saving and manufacturing cost.

The antenna module of the present invention comprises a substrate, a grounding metal layer, a dual-frequency antenna and a signal feeding portion, wherein the signal feeding portion is for receiving an external signal. The substrate includes a first surface, and the grounded metal layer is disposed on the first surface of the substrate. The dual frequency antenna includes a ground portion, a first radiating unit, and a second radiating unit. The grounding portion is connected to the grounding metal layer, wherein one end of the first radiation strip is connected to the grounding portion, and the other end is spirally extended to enclose an incompletely closed region.

The second radiating element is connected to the other end of the first radiating unit, wherein the second radiating unit comprises a connecting portion, a first adjusting arm and a second adjusting arm. The connecting portion is connected to one end of the first radiating unit and extends toward the incompletely closed region. The first adjustment arm is coupled to one end of the connecting portion and extends in one direction. The second adjustment arm is coupled to one end of the connecting portion and extends in another direction away from the first adjusting arm. In addition, the antenna module of the embodiment adjusts the overall impedance matching of the antenna module by capacitive coupling formed between at least a portion of the first radiating element and the grounded metal layer.

In various embodiments of the invention, at least a portion of the dual frequency antenna and the grounded metal layer may be sandwiched by an angle of 180[deg.]. Furthermore, the second radiating element further comprises a third adjusting arm, wherein the third adjusting arm is connected to one end of the second adjusting arm and extends out.

In another preferred embodiment, the antenna module of the present invention comprises a substrate, a grounding metal layer, and a dual-frequency antenna, wherein the grounding metal layer is disposed on the first surface of the substrate. The dual-frequency antenna includes a grounding portion, a radiating unit, and a signal feeding portion, wherein the radiating unit further includes a long arm, a short arm, a tail end, and a first adjusting arm.

One end of the grounding portion is connected to the grounding metal layer, and the other end is a long arm connecting the radiating elements. The short arm of the radiating element is formed by rewinding from the other end of the long arm, wherein the extending directions of the long arm and the short arm are substantially parallel to each other. The tail end of the radiating element is formed by rewinding from the other end of the short arm and between the long arm and the short arm. In another aspect, the first adjustment arm is coupled to the trailing end proximate one end of the short arm and extends away from the trailing end. The antenna module of this embodiment adjusts the overall impedance matching of the antenna module by capacitive coupling formed between at least a portion of the short arm and the grounded metal layer.

The present invention relates to a wireless signal transmission dual frequency antenna; in particular, a wireless signal transmission dual frequency antenna for the IEEE 802.11 standard. In the embodiment of the present invention, the wireless signal transmission dual-frequency antenna of the present invention is used for transmitting and receiving wireless signals for various electronic devices, including the notebook computer, the desktop computer, the mobile phone, and the personal digital assistant ( PDA) and electronic game instruments. In addition, the antenna module of the present invention can also be used for a small wireless transmission device such as a wireless network portable dual-frequency antenna (WiFi USB Dongle).

2 is a schematic diagram of an antenna module 100 of the present invention. As shown in FIG. 2, the antenna module 100 of the present embodiment includes a substrate 200, a grounding metal layer 210, a signal feeding portion 220, and a dual-frequency antenna 300. The grounding metal layer 210, the signal feeding portion 220, and the dual frequency of the embodiment are shown. The antennas 300 are all disposed on the first surface 201 of the substrate 200. In this embodiment, the antenna module 100 is substantially used in a wireless network dual-band antenna (WiFi USB Dongle) for receiving and outputting wireless signals. The grounding metal layer 210 of the antenna module 100 can also be used for Set up other electronic components to save the overall space of the wireless network portable dual-band antenna. Further, the substrate 200 of the present invention includes a conventional circuit board such as a printed circuit board and a flexible printed circuit. In addition, the substrate 200 of the present invention is preferably made of a plastic material such as polyethylene terephthalate (PET) or other dielectric material, but is not limited thereto.

In the embodiment shown in FIG. 2, the signal feeding unit 220 is electrically connected to an external signal source (not shown) and receives the electrical signal output by the external signal source. The signal feed unit 220 then excites the dual frequency antenna 300 with the electrical signal to form at least one high frequency mode and at least one low frequency mode. In this embodiment, the high frequency mode includes the 5 GHz wireless frequency band defined in the wireless network communication standard IEEE 802.11, and the low frequency mode includes the 2 GHz wireless frequency band defined in the IEEE 802.11, but is not limited thereto; The dual-band antenna 300 can also generate wireless signals of other frequency bands due to different signals.

In this embodiment, the dual-frequency antenna 300 is a metal wire or a metal microstrip having a geometric shape disposed on the first surface 201 in a printed manner, but is not limited thereto; in different embodiments, the dual-frequency antenna 300 can also be formed over the substrate by etching.

The dual-frequency antenna 300 of the present embodiment includes a ground portion 310, a first radiating unit 320, and a second radiating unit 330. As shown in FIG. 2 , the grounding portion 310 is electrically connected to the ground metal layer 210 . One end of the first radiating unit 320 is electrically connected to the ground portion 310, and the other end is spirally extended to enclose an incompletely enclosed region 400. In addition, the signal feeding portion 220 for receiving the external signal is electrically connected to the first radiating unit 320 and located in the incompletely enclosed region 400. The first radiating element 320 of the present embodiment is a ㄇ-type radiating unit, wherein the present invention utilizes the ㄇ-type structure of the first radiating element 320 to maintain its equivalent current path length at a quarter wavelength of the low frequency and Thereby, the area occupied by the antenna module 100 is effectively reduced. However, in various embodiments, the first radiation strip 320 may have other shapes for attachment to other metal strips or metal microstrips.

In the embodiment shown in FIG. 2, the end of the portion of the first radiating element 320 is located between the incompletely enclosed region 400 and the grounded metal layer 210 and forms a space D, wherein the capacitive coupling is established in the portion of the first radiating element. 320 and the grounding metal layer 210 for adjusting the overall impedance matching between the antenna module 100 of the present invention and the external signal transmission line. In the present embodiment, the interval D between the end of the first radiation strip 320 and the ground metal layer 210 is substantially 1.0 mm, but is not limited thereto. The manufacturer can adjust the capacitive coupling between the two and the corresponding impedance matching by selectively changing the length of the end of the first radiation strip 320 and the spacing of the end from the ground metal layer 210.

As shown in FIG. 2, the second radiating unit 330 is located in the incompletely enclosed region 400 enclosed by the first radiating unit 320 and electrically connected to the other end of the first radiating strip 320. The second radiating unit 330 includes a connecting portion 331 , a first adjusting arm 332 and a second adjusting arm 333 , wherein the connecting portion 331 is electrically connected to one end of the first radiating unit 320 and extends toward the incompletely enclosed region 400 . The first adjusting arm 332 and the second adjusting arm 333 are electrically coupled to one end of the connecting portion 331 , wherein the first adjusting arm 332 and the second adjusting arm 333 extend in different directions. As shown in FIG. 2, the first adjusting arm 332 extends in a direction toward the center of the incompletely closed region 400. On the other hand, the second adjusting arm 333 is in the other direction away from the first adjusting arm 332. The entrance 220 extends out. In this way, the second radiating element 330 in this embodiment is substantially a radiating unit having a T shape. In addition, the length and width of the dual-band antenna 300 in this embodiment are much smaller than that of the conventional dual-band antennas of 14 mm and 2.5 mm; thus, the dual-band antenna 300 can further save the space required for the antenna module 100, but Not limited to this. In different embodiments. The length and width of the dual-frequency antenna 300 can be adjusted according to the size or performance requirements of the corresponding antenna module 100.

FIG. 3 is another schematic diagram of the antenna module 100 shown in FIG. 2 , wherein the antenna module 100 similarly includes a substrate 200 , a ground metal layer 210 , a signal feeding portion 220 , and a dual-frequency antenna 300 . In addition, the dual-frequency antenna 300 of the present embodiment includes a grounding portion 310 and a radiating unit 340.

In this embodiment, the radiating unit 340 includes a long arm 341, a short arm 342, a tail end 343, and a first adjusting arm 332. The signal feeding portion 220 extends from the long arm 341 to the grounding metal layer 210 and is external to the signal source. The electrical signal is received to excite the dual frequency antenna 300 to form at least one high frequency mode and at least one low frequency mode. In this embodiment, the high frequency mode includes the 5 GHz wireless frequency band defined in the wireless network communication standard IEEE 802.11, and the low frequency mode includes the 2 GHz wireless frequency band defined in the IEEE 802.11, but is not limited thereto; The dual-band antenna 300 can also generate wireless signals of other frequency bands due to different signals.

As shown in FIG. 3, the long arm 341 of the radiating unit 340 is connected to one end of the ground portion 310 and extends along one side of the shorter side of the substrate 200. The short arm 342 extends from the other end of the long arm 341 in a wraparound manner, and a portion of the short arm 342 extends along one of the longer sides of the substrate 200. Further, the directions of the long arms 341 and at least a portion of the short arms 342 are substantially parallel to each other. On the other hand, the trailing end 343 extends from the other end of the short arm 342 in a wraparound manner and is located between the long arm 341 and the short arm 342. In other words, the trailing end 343 is located in the unsealed region formed between the long arm 341 and the short arm 342.

In addition, the first adjustment arm 332 is connected to the end 343 near one end of the short arm 342 and extends away from the tail end 343. In the embodiment shown in FIG. 3, a portion of the short arm 342 is formed between the ground metal layer 210 and a space D, and a capacitive coupling is established between the short arm 342 and the ground metal layer 210 for adjustment. The overall impedance matching between the antenna module 100 and the external signal transmission line of this embodiment. In the present embodiment, the interval D between the short arm 342 and the ground metal layer 210 is substantially 1.0 mm, but is not limited thereto. The manufacturer can adjust the capacitive coupling between the two and the corresponding impedance matching by selectively changing the length of the end of the first radiation strip 320 and the spacing of the end from the ground metal layer 210. In addition, the antenna modules 100 shown in FIG. 2 and FIG. 3 are substantially the same except for the components included in the radiating unit 340 and the manner in which the respective components are distributed, and thus are not described herein.

4A and 4B are schematic diagrams showing the voltage standing wave ratio distribution of the antenna module 100 shown in FIG. 2 in different frequency bands. The left-to-right response measurement curves A to E shown in FIG. 4A correspond to second adjustment arms 333 having lengths of 3 mm, 2.5 mm, 2 mm, 1.5 mm, and 0.5 mm, respectively, wherein the antenna module 100 will be according to the second The length of the arm 333 is adjusted to produce different response measurement curves, respectively. As can be seen from FIG. 4A, the center bandwidth of the response measurement curve generated by the antenna module 100 of the present invention is mainly distributed in the 2.4 GHz frequency band defined by the WiFi standard. However, the response measurement curve shown in FIG. 4A does not substantially differ in the shape of the curve and the return loss. It can be seen that the length of the second adjusting arm 333 affects the frequency distribution of the antenna module 100, but does not affect the strength loss of the wireless signal transmission.

On the other hand, the right-to-left response measurement curves F to J shown in FIG. 4B correspond to the first adjustment arms 332 having lengths of 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm, respectively, wherein the antenna module 100 will be adjusted according to the first The length of the arms 332 produces different response measurements, respectively. As can be seen from FIG. 4B, the center bandwidth of the response measurement curve generated by the antenna module 100 of the present invention is mainly distributed in the 5.5 GHz band defined by the WiFi standard. Therefore, the antenna module 100 of the present invention can be applied to wireless transmission standards corresponding to frequencies of 5 GHz or higher, such as IEEE 802.11a, IEEE 802.11n, HiperLAN1, and HiperLAN2. It can be seen that the antenna module 100 of the present invention has a dual frequency wireless transmission function. However, since the return loss of each response measurement curve in the frequency band, the effect bandwidth corresponding to VSWR=2, and the center bandwidth are large, the manufacturer of the antenna module 100 can be based on the wireless transmission band, The length of the first adjustment arm 332 and the second adjustment arm 333 are adjusted as needed for signal strength or other performance. In addition, in the embodiment shown in FIG. 4A and FIG. 4B, the inventor only adjusts the length of one of the first adjustment arm 332 or the second adjustment arm 332, but is not limited thereto; in different embodiments, simultaneously The lengths of the first adjustment arm 332 and the second adjustment arm 333 are adjusted to obtain an ideal response measurement curve.

FIG. 5 shows a modified embodiment of the antenna module 100 of the present invention. In the present embodiment, the dual-frequency antenna 300 is vertically erected from the grounded metal layer 210 and has an angle θ of less than 180° with the grounded metal layer 210. Since the dual-band antenna 300 is raised from the grounded metal layer 210, the overall length of the antenna module 100 of the present invention can be reduced and the corresponding electronic device (such as a notebook computer or a communication handset) can be further reduced in size. In this embodiment, the angle θ between the dual-band antenna 300 and the grounded metal layer 210 is preferably 90°, but is not limited thereto; in different embodiments, the angle θ may also be based on size or other performance. Adjust as needed. The antenna modules 100 shown in FIGS. 2 and 5 are substantially equal except for the rise of the angle θ from the grounded metal layer 210, and thus are not described herein.

FIG. 6 shows another variation of the antenna module 100 of the present invention. The antenna module 100 of the present embodiment further includes a third adjustment arm 334 (or an adjustment arm), wherein the third adjustment arm 334 is electrically connected to one end of the second adjustment arm 333 and extends out. The third adjustment arm 334 is used to change the capacitive coupling between the dual frequency antenna 300 and the ground metal layer 210 to further adjust the impedance matching between the antenna module 100 and the external signal transmission line. In addition, the second adjusting arm 333 and the third adjusting arm 334 of the embodiment are substantially perpendicular to each other, but are not limited thereto; in different embodiments, the adjusting arms 333 and 334 may also be in accordance with performance requirements. Clips have other suitable angles.

While the foregoing description and drawings have been shown in the preferred embodiments of the embodiments of the invention The spirit and scope of this creative principle. Those skilled in the art will appreciate that the present invention may be modified in many forms, structures, arrangements, proportions, materials, components and components. Therefore, the embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of this creation is defined by the scope of the appended patent application and covers its legal equivalents and is not limited to the foregoing description.

100. . . Antenna module

200. . . Substrate

201. . . First surface

210. . . Ground metal layer

220. . . Signal feed

300. . . Dual frequency antenna

310. . . Grounding

320. . . First radiation unit

330. . . Second radiating element

331. . . Connection

332. . . First adjustment arm

333. . . Second adjustment arm

334. . . Third adjustment arm

340. . . Radiation unit

341. . . Long arm

342. . . Short arm

343. . . Tail end

400. . . Incompletely enclosed area

D. . . interval

θ. . . angle

1 is a schematic diagram of a conventional antenna module;

2 is a schematic diagram of an antenna module of the present invention;

FIG. 3 is another schematic diagram of the antenna module shown in FIG. 2;

4A and 4B are schematic diagrams showing the distribution of voltage standing wave ratios of the antenna modules of FIG. 2 in different frequency bands;

5 and 6 show a modified embodiment of the antenna module of the present invention.

100. . . Antenna module

200. . . Substrate

201. . . First surface

210. . . Ground metal layer

220. . . Signal feed

300. . . Dual frequency antenna

310. . . Grounding

320. . . First radiation unit

330. . . Second radiating element

331. . . Connection

332. . . First adjustment arm

333. . . Second adjustment arm

400. . . Incompletely enclosed area

D. . . interval

Claims (12)

A dual-frequency antenna module includes: a substrate including a first surface; a grounding metal layer disposed on the first surface; and a dual-frequency antenna comprising: a grounding portion connecting the grounding metal layer; a radiating unit, one end is connected to the grounding portion, the other end is spirally extended to enclose an incompletely closed area; a second radiating unit is connected to the other end of the first radiating unit, wherein the second radiating element comprises; a connecting portion connecting the other end of the first radiating unit and extending toward the incompletely closed region; a first adjusting arm connecting one end of the connecting portion and extending in a direction; and a second adjusting arm connecting the connecting portion The end of the portion extends in another direction away from the direction; and a signal feed portion extending from the first radiation unit and located in the incompletely closed region; wherein at least a portion of the end of the first radiating unit is located at the A capacitive coupling is formed between the completely enclosed region and the grounded metal layer to adjust impedance matching of the dual frequency antenna. The antenna module of claim 1, wherein at least a portion of the dual-frequency antenna and the grounded metal layer are sandwiched by an angle of less than 180°. The antenna module of claim 2, wherein the angle is substantially 90°. The antenna module of claim 1, wherein the second radiating unit further comprises a third adjusting arm, wherein the third adjusting arm is connected to one end of the second adjusting arm. The antenna module of claim 4, wherein the second adjustment arm and the third adjustment The arms are substantially perpendicular to each other. A dual-frequency antenna comprising: a grounding portion connected to a grounding metal layer; a first radiating unit having one end connected to the grounding portion, the other end extending helically to enclose an incompletely enclosed region; and a second radiating element Connecting the other end of the first radiating unit, wherein the second radiating unit comprises: a connecting portion connecting the other end of the first radiating unit and extending toward the incompletely closed region; a first adjusting arm, Connecting one end of the connecting portion and extending in a direction; and a second adjusting arm connecting the end of the connecting portion and extending in another direction away from the direction; and a signal feeding portion extending from the first radiating unit And a portion of the first radiating element is located between the incompletely enclosed region and the grounded metal layer and forms a capacitive coupling to adjust impedance matching of the dual-frequency antenna. An antenna module includes: a substrate including a first surface; a grounding metal layer disposed on the first surface of the substrate; and a dual-frequency antenna comprising: a grounding portion, one end connected to the grounding metal layer; The radiating unit comprises: a long arm connected to the other end of the grounding portion; a short arm formed by rewinding from the other end of the long arm, wherein the extending direction of the long arm and at least part of the short arm are substantially parallel to each other; a trailing end formed by rewinding from the other end of the short arm and located between the long arm and the short arm; a first adjusting arm connecting the tail end to one end of the short arm and extending away from the tail end; and a signal feeding portion extending from the long arm of the radiating unit; wherein the short arm and the short arm The ground metal layer forms a capacitive coupling to adjust the impedance matching of the dual frequency antenna. The antenna module of claim 7, wherein at least a portion of the dual-frequency antenna and the grounded metal layer are sandwiched by an angle of less than 180°. The antenna module of claim 8, wherein the angle is substantially 90°. The antenna module of claim 7, further comprising a second adjustment arm connected to one end of the first adjustment arm and extending out. The antenna module of claim 10, wherein one of the first adjustment arm and the second adjustment arm has an angle of substantially 90°. A dual-frequency antenna includes: a grounding portion for connecting a grounded metal layer; and a dual-frequency antenna comprising: a grounding portion connected to the grounding metal layer at one end; and a radiating unit comprising: a long arm connected to the grounding portion The other end; a short arm formed by rewinding from the other end of the long arm, wherein the long arm and the short arm extend substantially parallel to each other; and a tail end rewinding from the other end of the short arm a long arm and the short arm; and a first adjusting arm connecting the tail end to one end of the short arm and extending away from the tail end; and a signal feeding portion from the long arm of the radiating unit Extending out; wherein the short arm forms a capacitive coupling with the ground metal layer to adjust impedance matching of the dual frequency antenna.