TW201828535A - Antenna system - Google Patents

Abstract

An antenna system includes at least a first tunable antenna. The first tunable antenna includes a first radiation element, a second radiation element, a transmission line, and a switch circuit. The transmission line includes a first segment, a second segment, and a phase-adjustment segment. The first radiation element is coupled through the first segment to a first feeding point. The second radiation element is coupled through the second segment to a second feeding point. The switch circuit is configured to switch between the first feeding point and the second feeding point, such that the first feeding point or the second feeding point is arranged for receiving a feeding signal. The phase-adjustment segment has a first end and a second end. The first feeding point is positioned at the first end of the phase-adjustment segment. The second feeding point is positioned at the second end of the phase-adjustment segment.

Description

   Antenna system   

The present invention relates to an antenna system, in particular to an antenna system capable of generating different radiation patterns.

With the development of mobile communication technology, mobile devices have become more and more common in recent years. Common examples include: portable 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-range wireless communication ranges, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz frequency bands to communicate, and Some cover short-range wireless communication ranges, such as: Wi-Fi, Bluetooth systems use the 2.4GHz, 5.2GHz, and 5.8GHz bands for communication.

Antenna is an indispensable component in mobile devices that support wireless communication functions. However, the general antenna can only generate a fixed radiation pattern. If the signal receiving direction is toward the null point of the antenna radiation field type, it will cause the problems of reduced data transmission rate and poor communication quality. In view of this, a new solution must be proposed to overcome the dilemma faced by the previous technology.

In a preferred embodiment, the present invention provides an antenna system including: a first tunable antenna including: a transmission line including a first section, a second section, and a phase adjustment section; a first A radiating section, wherein the first radiating section is coupled to a first feeding point via the first section; a second radiating section, wherein the second radiating section is coupled to a first section through the second section; A second feeding point; and a switching circuit for switching between the first feeding point and the second feeding point so that the first feeding point or the second feeding point can receive a feeding signal ; Wherein the phase adjustment section has a first end and a second end, the first feed point is located at the first end of the phase adjustment section, and the second feed point is located at the phase adjustment area Paragraph the second end.

In some embodiments, by switching between the first feeding point and the second feeding point, the first tunable antenna can generate different radiation field patterns.

In some embodiments, the phase adjustment section has an inverted U-shape.

In some embodiments, the switching circuit is at least partially disposed in a gap of the inverted U-shape of the phase adjustment section.

In some embodiments, the first radiating portion and the second radiating portion each have a straight bar shape or an L-shape.

In some embodiments, the antenna system covers an operating frequency band between 5150 MHz and 5875 MHz.

In some embodiments, the length of the phase adjustment section is less than or equal to 0.25 times the wavelength of a center frequency of the operating frequency band.

In some embodiments, the distance between the first radiating portion and the second radiating portion is approximately equal to 0.25 times the wavelength of a center frequency of the operating frequency band.

In some embodiments, the length of each of the first radiating portion and the second radiating portion is approximately equal to 0.25 times the wavelength of a center frequency of the operating frequency band.

In some embodiments, the switching circuit includes: a single pole double throw switch having a common end, a first end, and a second end, wherein the common end of the single pole double throw switch is coupled to a signal source The first end of the single pole double throw switch is coupled to the first feed point, and the second end of the single pole double throw switch is coupled to the second feed point.

In some embodiments, the switching circuit further includes: a first capacitor coupled between the signal source and the common end of the single-pole double-throw switch; a second capacitor coupled to the first feeding point And the first end of the single pole double throw switch; and a third capacitor coupled between the second feeding point and the second end of the single pole double throw switch.

In some embodiments, the first tunable antenna further includes: a dielectric substrate having an upper surface and a lower surface, wherein the first radiating portion and the second radiating portion are disposed on the upper surface of the dielectric substrate; A metal trace is disposed on the upper surface of the dielectric substrate; and a ground plane is disposed on the lower surface of the dielectric substrate; wherein the transmission line is a microstrip line formed by the metal trace and the ground plane .

In some embodiments, the ground plane is an inverted T-shape.

In some embodiments, a vertical projection of the metal trace on the lower surface of the dielectric substrate is completely inside the ground plane.

In some embodiments, the phase adjustment section is in a straight bar shape.

In some embodiments, a third feed point is further located at the center of one of the phase adjustment sections, and the switching circuit is further than the first feed point, the second feed point, and the third feed point. The input points are switched so that the first feed point, the second feed point, or the third feed point can receive the feed signal.

In some embodiments, the antenna system further includes a second tunable antenna, wherein the second tunable antenna has the same structure as the first tunable antenna.

In some embodiments, the first tunable antenna and the second tunable antenna are respectively disposed at two opposite corners of a display of a mobile device.

In some embodiments, the mobile device is a laptop computer.

In some embodiments, the first tunable antenna and the second tunable antenna can generate different synthetic radiation field patterns.

100, 300, 400, 600‧‧‧ antenna systems

110, 310, 411, 610‧‧‧ first tunable antenna

120, 320‧‧‧ First Radiation Department

130, 330‧‧‧Second Radiation Department

140, 340‧‧‧ the first section of the transmission line

Second section of 150, 350‧‧‧ transmission line

Phase adjustment section of 160, 360, 660‧‧‧ transmission line

161, 361, 661‧‧‧ the first end of the phase adjustment section

Second end of 162, 362, 662‧‧‧‧ phase adjustment section

165‧‧‧ gap

170‧‧‧switching circuit

Common end of 171‧‧‧ single pole double throw switch

172‧‧‧The first end of single pole double throw switch

173‧‧‧Second end of single pole double throw switch

175‧‧‧Single pole double throw switch

199‧‧‧Signal Source

380‧‧‧ Dielectric Substrate

390‧‧‧metal wiring

395‧‧‧ ground plane

412‧‧‧Second Tunable Antenna

420‧‧‧mobile device

430‧‧‧ Display

431, 432‧‧‧ corner of the display

C1‧‧‧First capacitor

C2‧‧‧Second capacitor

C3‧‧‧Third capacitor

D1‧‧‧Pitch

E1‧‧‧ top surface of dielectric substrate

E2‧‧‧ the lower surface of the dielectric substrate

FP1‧‧‧First feed point

FP2‧‧‧Second Feed Point

FP3‧‧‧ Third Feed Point

L1, L2, L3‧‧‧ length

SF‧‧‧Feed signal

X‧‧‧X axis

Y‧‧‧Y axis

Z‧‧‧Z axis

FIG. 1 is a schematic diagram showing an antenna system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a switching circuit according to an embodiment of the present invention.

FIG. 3A is a front view showing an antenna system according to an embodiment of the present invention.

FIG. 3B is a rear view of the antenna system according to an embodiment of the present invention.

Fig. 4 is a schematic diagram showing an antenna system according to an embodiment of the present invention.

FIG. 5A is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

FIG. 5B is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

FIG. 5C is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

FIG. 5D is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing an antenna system according to another embodiment of the present invention.

FIG. 7A is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

FIG. 7B is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

FIG. 7C is a diagram showing a synthetic radiation field pattern of an antenna system according to an embodiment of the present invention.

In order to make the objects, features, and advantages of the present invention more comprehensible, specific embodiments of the present invention are specifically listed below, and described in detail with the accompanying drawings.

Certain terms are used in the description and the scope of patent applications to refer to specific elements. Those skilled in the art will understand that hardware manufacturers may use different terms to refer to the same component. The scope of this specification and the patent application does not take the difference in names as a way to distinguish components, but the difference in function of components as a criterion for distinguishing components. The terms "including" and "including" mentioned throughout the specification and the scope of patent applications are open-ended terms and should be interpreted as "including but not limited to." The term "approximately" means that within the acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the term "coupled" includes any direct and indirect electrical connection means in this specification. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be electrically connected directly to the second device, or indirectly electrically connected to the first device via other devices or connection means.二 装置。 Two devices.

FIG. 1 is a schematic diagram showing an antenna system 100 according to an embodiment of the present invention. The antenna system 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer. As shown in FIG. 1, the antenna system 100 includes at least a first tunable antenna 110, wherein the first tunable antenna 110 includes a first radiating element 120 and a second radiating element 130. A transmission line and a switch circuit 170, wherein the aforementioned transmission line includes a first segment 140, a second segment 150, and a phase-adjustment segment ) 160.

The first radiating portion 120, the second radiating portion 130, the first section 140, the second section 150, and the phase adjustment section 160 can be made of a conductive material, such as a metal material. It must be understood that the shapes and types of the first radiating portion 120, the second radiating portion 130, the first section 140, the second section 150, and the phase adjustment section 160 are not particularly limited in the present invention. For example, the first radiating part 120 and the second radiating part 130 may jointly form a monopole antenna (Dipole Antenna), a dipole antenna (Dipole Antenna), a patch antenna (Patch Antenna), or Chip Antenna; and the aforementioned transmission lines (including the first section 140, the second section 150, and the phase adjustment section 160) may be a microstrip line, a stripline Or a Coplanar Waveguide (CPW).

The first tunable antenna 110 has a first feeding point FP1 and a second feeding point FP2. The first radiating portion 120 and the second radiating portion 130 may each have a straight bar shape or a rectangular shape. The first radiating portion 120 is coupled to the first feeding point FP1 via the first section 140, and the second radiating portion 130 is coupled to the second feeding point FP2 via the second section 150. The phase adjustment section 160 is interposed between the first feeding point FP1 and the second feeding point FP2 and is used to change the feeding phases of the first radiating portion 120 and the second radiating portion 130. In detail, the phase adjustment section 160 has a first end 161 and a second end 162. The first feed point FP1 is located at the first end 161 of the phase adjustment section 160, and the second feed point FP2 is Located at the second end 162 of the phase adjustment section 160. The switching circuit 170 can switch between the first feeding point FP1 and the second feeding point FP2, so that either the first feeding point FP1 or the second feeding point FP2 can receive a feeding signal SF. A signal source (Signal Source) 199 can be a radio frequency (RF) module, which can be used to generate a feed signal SF or process a received signal. The signal source 199 is coupled to one of the first feeding point FP1 or the second feeding point FP2 via the switching circuit 170 to excite the first tunable antenna 110. In some embodiments, the phase adjustment section 160 is roughly an inverted U-shape, wherein the switching circuit 170 is at least partially disposed in a notch 165 of the inverted U-shape of the phase adjustment section 160 to reduce the first adjustable The overall size of the antenna 110. In other embodiments, the phase adjustment section 160 may have different shapes, such as a straight bar shape, a W-shape, or a C-shape. By switching between the first feed point FP1 and the second feed point FP2, the first tunable antenna 110 will generate different radiation patterns due to a change in the feed phase, so that it can receive or transmit various radiation patterns. Directional wireless signal.

In some embodiments, the antenna system 100 covers an operating frequency band between 5150 MHz and 5875 MHz to support WLAN (Wireless Local Area Networks) applications at 5 GHz. It must be noted that the aforementioned operating frequency band can also be adjusted according to different needs. In some embodiments, the component dimensions of the antenna system 100 are as described below. The length L1 of the phase adjustment section 160 may be equal to 0.25 times the wavelength (λ / 4) of the center frequency of one of the aforementioned operating frequency bands to provide a feed-in phase difference of approximately 90 degrees. Since the switching circuit 170 itself can contribute a little feed-in phase difference, in other embodiments, the length L1 of the phase adjustment section 160 may be slightly smaller than the wavelength (λ / 4) of the center frequency of the aforementioned operating band. The distance D1 between the first radiating portion 120 and the second radiating portion 130 may be approximately equal to a wavelength (λ / 4) of 0.25 times the center frequency of the aforementioned operating frequency band. The length L2 of each of the first radiating portion 120 and the second radiating portion 130 may be approximately equal to a wavelength (λ / 4) of 0.25 times the center frequency of the aforementioned operating frequency band. The above element size range is obtained based on the results of multiple experiments, which helps to optimize the radiation field pattern and impedance matching of the antenna system 100.

FIG. 2 is a schematic diagram showing a switching circuit 170 according to an embodiment of the present invention. In the embodiment of FIG. 2, the switching circuit 170 includes at least a Single Port Double Throw (SPDT) switch 175, which has a common terminal 171, a first terminal 172, and a second terminal 173. The common end 171 of the single pole double throw switch 175 is coupled to the signal source 199, the first end 172 of the single pole double throw switch 175 is coupled to the first feed point FP1, and the second end 173 of the single pole double throw switch 175 is Coupled to the second feed point FP2. In some embodiments, the switching circuit 170 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. In detail, the first capacitor C1 is coupled between the signal source 199 and the common terminal 171 of the single-pole double-throw switch 175, and the second capacitor C2 is coupled between the first feeding point FP1 and the single-pole double-throw switch 175. The third capacitor C3 is coupled between the second feeding point FP2 and the second terminal 173 of the single pole double throw switch 175. The first capacitor C1, the second capacitor C2, and the third capacitor C3 are used to block direct current (DC) noise from entering the first radiating portion 120 and the second radiating portion 130. In other embodiments, the first capacitor C1, the second capacitor C2, and the third capacitor C3 may also be removed, and each of them may be replaced by a Shorted-Circuit Path, so that the single-pole double-throw switch 175 can be directly connected to the signal source 199, the first feeding point FP1, and the second feeding point FP2.

FIG. 3A is a front view of an antenna system 300 according to an embodiment of the present invention. FIG. 3B is a rear view of the antenna system 300 according to an embodiment of the present invention. Please refer to Figures 3A and 3B together. 3A and 3B are similar to FIG. 1 and can be regarded as an actual circuit layout of the antenna system 100. In the embodiment shown in FIGS. 3A and 3B, the antenna system 300 includes a first tunable antenna 310, wherein the first tunable antenna 310 includes a first radiating portion 320, a second radiating portion 330, a transmission line, and A switching circuit 170, wherein the aforementioned transmission line includes a first section 340, a second section 350, and a phase adjustment section 360. The phase adjustment section 360 has a first end 361 and a second end 362. The first radiating part 320 is coupled to one of the first ends at the first end 361 of the phase adjustment section 360 via the first section 340. The input point FP1, and the second radiating portion 330 is coupled to one of the second feeding points FP2 at the second end 362 of the phase adjustment section 360 via the second section 350. The structures and functions of the switching circuit 170 and the signal source 199 are as described in the embodiments of FIGS. 1 and 2.

In detail, the first tunable antenna 310 further includes a dielectric substrate 380, a metal trace 390, and a ground plane 395. The dielectric substrate 380 has an upper surface E1 and a lower surface E2, wherein the first radiating portion 320 and the second radiating portion 330 are disposed on the upper surface E1 of the dielectric substrate 380. For example, the first radiating portion 320 and the second radiating portion 330 may each be an L-shaped metal sheet and printed on the upper surface E1 of the dielectric substrate 380. The ends of both the first radiating portion 320 and the second radiating portion 330 may be Extend towards each other. On the other hand, the metal trace 390 is provided or printed on the upper surface E1 of the dielectric substrate 380, and the ground plane 395 is provided or printed on the lower surface E2 of the dielectric substrate 380. The metal trace 390 may present a meandering shape, and the ground plane 395 may present an inverted T-shape. Among them, a vertical projection of the metal trace 390 on the lower surface E2 of the dielectric substrate 380 may be completely located on the ground plane 395. internal. Under this design, the aforementioned transmission line (including the first section 340, the second section 350, and the phase adjustment section 360) may be a microstrip line formed by the metal trace 390 and the ground plane 395. Line). It must be noted that the shape of the ground plane 395 can be adjusted and scaled according to the shapes of the first section 340, the second section 350, and the phase adjustment section 360. Since the ground plane 395 occupies only a small area of the lower surface E2 of the dielectric substrate 380, this can prevent the radiation characteristics of the first radiating portion 320 and the second radiating portion 330 from being disturbed by an excessively large ground plane. The antenna system 300 can be implemented by using a general printed circuit board (PCB) manufacturing process, so it has the advantages of low design complexity and low cost. The remaining features of the antenna system 300 in FIGS. 3A and 3B are similar to those of the antenna system 100 in FIG. 1, and thus the two embodiments can achieve similar operating effects.

FIG. 4 is a schematic diagram showing an antenna system 400 according to an embodiment of the present invention. In the embodiment shown in FIG. 4, the antenna system 400 includes a first tunable antenna 411 and a second tunable antenna 412, which are applied to a mobile device 420. The second tunable antenna 412 has the same structure as the first tunable antenna 411. For example, the structure of each of the first tunable antenna 411 and the second tunable antenna 412 may be the same as the first tunable antenna 110 in FIG. 1. Therefore, the antenna system 400 can support a multi-input and multi-output (MIMO) function. In detail, the mobile device 420 may be a notebook computer, wherein the first tunable antenna 411 and the second tunable antenna 412 may be respectively disposed at two corners 431 and 432 of one display 430 of the mobile device 420 (for example, The first tunable antenna 411 and the second tunable antenna 412 may be disposed parallel to the XZ plane). Both the first tunable antenna 411 and the second tunable antenna 412 can generate different synthetic radiation field patterns.

FIG. 5A shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 5A, the first tunable antenna 411 is switched to its second feed point, and the second tunable antenna 412 is switched to its second feed point to increase the -X axis direction (or Azimuth angle of 180 degrees). FIG. 5B shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 5B, the first tunable antenna 411 is switched to its second feeding point, and the second tunable antenna 412 is switched to its first feeding point to uniformize the radiation intensity in all directions. . FIG. 5C shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 5C, the first tunable antenna 411 is switched to its first feeding point, and the second tunable antenna 412 is switched to its second feeding point to uniformize the radiation intensity in all directions. . Fig. 5D shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 5D, the first tunable antenna 411 is switched to its first feed point, and the second tunable antenna 412 is switched to its first feed point to increase the + X axis direction (or Azimuth 0 degrees). According to the measurement results in Figs. 5A-5D, it can be known that by the first of each of the first tunable antenna 411 and the second tunable antenna 412 (the actual structure is the same as the first tunable antenna 110 in Fig. 1) Switching between the feed point and the second feed point, the antenna system 400 can generate four different synthetic radiation field patterns. It must be noted that the present invention is not limited to this. In other embodiments, the antenna system 400 may include more tunable antennas to generate more synthetic radiation field patterns.

FIG. 6 is a schematic diagram showing an antenna system 600 according to another embodiment of the present invention. Figure 6 is similar to Figure 1. In the embodiment shown in FIG. 6, the antenna system 600 includes a first tunable antenna 610, wherein the first tunable antenna 610 includes a first radiating portion 120, a second radiating portion 130, a transmission line, and a switch Circuit 670, wherein the aforementioned transmission line includes a first section 140, a second section 150, and a phase adjustment section 660. The phase adjustment section 660 has a first end 661 and a second end 662. The first radiating part 120 is coupled to one of the first ends at the first end 661 of the phase adjustment section 660 via the first section 140. The input point FP1, and the second radiating portion 130 is coupled to one of the second feeding points FP2 at the second end 662 of the phase adjustment section 660 via the second section 150. The aforementioned transmission line (including the first section 140, the second section 150, and the phase adjustment section 660) may be a microstrip line, a strip line, or a coplanar waveguide. The structures and functions of the first radiating section 120, the second radiating section 130, the first section 140, the second section 150, and the signal source 199 are as described in the embodiments of FIGS. 1 and 2.

The phase adjustment section 660 may have a substantially straight bar shape. The length L3 of the phase adjustment section 660 can be less than or equal to 0.25 times the wavelength (λ / 4) of a center frequency of one of the operating frequency bands of the antenna system 600, so it can provide a feed-in phase difference of approximately 90 degrees. A third feed point FP3 is located at a center of one of the phase adjustment sections 660 (for example, one of the first feed point FP1 and the second feed point FP2 is a center point), and the switching circuit 670 may be located at the first A feed point FP1, a second feed point FP2, and a third feed point FP3 are switched, so that the signal source 199 can be coupled to the first feed point FP1, the second feed point FP2 through the switching circuit 670. , Or the third feed point FP3. Therefore, the first feed point FP1, the second feed point FP2, or the third feed point FP3 can receive a feed signal SF from the signal source 199. Similarly, as described in the embodiment in FIG. 2, an individual capacitor may be coupled to either end of the switching circuit 670 and the first feeding point FP1, the second feeding point FP2, the third feeding point FP3, and Between any one of the signal sources 199, DC noise is blocked from entering the first radiating portion 120 and the second radiating portion 130. By switching between the first feed point FP1, the second feed point FP2, and the third feed point FP3, the first tunable antenna 610 will generate a different radiation field pattern due to a change in the feed phase, so that Receive or transmit wireless signals in various directions.

Please refer to Figure 4 again. In some embodiments, the structure of each of the first tunable antenna 411 and the second tunable antenna 412 may be the same as the first tunable antenna 610 of FIG. 6 to generate different synthetic radiation field patterns. FIG. 7A shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 7A, the first tunable antenna 411 is switched to its first feed point, and the second tunable antenna 412 is also switched to its first feed point to improve the + X axis direction (or Azimuth 0 degrees). FIG. 7B shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 7B, the first tunable antenna 411 is switched to its second feed point, and the second tunable antenna 412 is also switched to its second feed point to improve the -X axis direction (or Azimuth angle of 180 degrees). FIG. 7C shows a synthetic radiation field pattern of the antenna system 400 according to an embodiment of the present invention, which is measured on the XY plane. In the embodiment of FIG. 7C, the first tunable antenna 411 is switched to its third feed point, and the second tunable antenna 412 is also switched to its third feed point to uniformize the radiation intensity in all directions. . According to the measurement results in FIGS. 7A-7C, it can be known that the first tunable antenna 411 and the second tunable antenna 412 each Switching between the feed point, the second feed point, and the third feed point, the antenna system 400 can generate three different synthetic radiation field patterns. It must be noted that the present invention is not limited to this. In other embodiments, the antenna system 400 may include more tunable antennas to generate more synthetic radiation field patterns.

In some embodiments, the third feeding point FP3 of FIG. 6 and the alternative switching circuit 670 may also be applied to the first tunable antenna 110 in FIG. 1 or the first tunable antenna 310 in FIGS. 3A and 3B. Therefore, the antenna systems 100 and 300 can generate more different radiation field types.

In some embodiments, the aforementioned switching circuit executes a feeding point selection procedure according to a control signal, and the control signal may be generated by a processor module. For example, the processor module can control the switching circuit to switch to all feed point combinations one by one, and finally select a specific feed point combination corresponding to the maximum received signal strength indicator (RSSI) to optimize the antenna System communication quality. The aforementioned processor module may be implemented by a hardware circuit, or may be implemented by executing a computer software program. For example, the processor module may be a Wi-Fi module, and its control signal may be transmitted to the switching circuit through a General-Purpose Input / Output (GPIO) interface, but it is not limited to this.

The invention proposes a novel antenna system, which can be switched between various feeding points, so that one or more tunable antennas can generate different radiation field patterns. In detail, the present invention can equalize the received signal strength index (RSSI) of each tunable antenna, so it can improve the throughput of the overall antenna system. According to the actual measurement results, if the antenna system 400 in FIG. 4 is implemented with two first tunable antennas 110 that are also in FIG. 1, the null point of its radiation field type can be enhanced by about 69% to 633%. , And its average data transmission rate can be increased by about 22% to 90%. In addition, if the antenna system 400 in FIG. 4 is implemented with two first tunable antennas 610, which are also in FIG. 6, the zero point of its radiation pattern can be enhanced by about 56%, and its average data transmission rate can be increased by twenty two%. The above improvements can meet the practical application requirements of general mobile communication devices.

It is worth noting that the above-mentioned component size, component shape, and frequency range are not the limiting conditions of the present invention. The antenna designer can adjust these settings according to different needs. The antenna system of the present invention is not limited to the state shown in Figs. 1-7. The invention may include only any one or more of the features of any one or more of the embodiments of Figures 1-7. In other words, not all the illustrated features have to be implemented in the antenna system of the present invention at the same time.

The ordinal numbers in this specification and the scope of patent application, such as "first", "second", "third", etc., do not have a sequential relationship with each other, they are only used to indicate that two have the same Different components of the name.

Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications and decorations without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (20)

    An antenna system includes: a first tunable antenna including: a transmission line including a first section, a second section, and a phase adjustment section; a first radiating section, wherein the first radiating section Is coupled to a first feeding point via the first section; a second radiating section, wherein the second radiating section is coupled to a second feeding point through the second section; and a switching circuit Switching between the first feed point and the second feed point, so that the first feed point or the second feed point can receive a feed signal; wherein the phase adjustment section has a first One end and a second end, the first feed point is located at the first end of the phase adjustment section, and the second feed point is located at the second end of the phase adjustment section.         The antenna system according to item 1 of the scope of patent application, wherein the first tunable antenna can generate different radiation field patterns by switching between the first feeding point and the second feeding point.         The antenna system according to item 1 of the scope of patent application, wherein the phase adjustment section presents an inverted U-shape.         The antenna system according to item 3 of the scope of patent application, wherein the switching circuit is at least partially disposed in a gap of the inverted U-shape of the phase adjustment section.         The antenna system according to item 1 of the scope of patent application, wherein the first radiating portion and the second radiating portion each have a straight bar shape or an L-shape.         The antenna system according to item 1 of the patent application scope, wherein the antenna system covers an operating frequency band between 5150 MHz and 5875 MHz.         The antenna system according to item 6 of the scope of patent application, wherein the length of the phase adjustment section is less than or equal to 0.25 times the wavelength of a center frequency of the operating frequency band.         The antenna system according to item 6 of the patent application, wherein a distance between the first radiating portion and the second radiating portion is approximately equal to a wavelength of 0.25 times a center frequency of the operating frequency band.         The antenna system according to item 6 of the application, wherein the length of each of the first radiating portion and the second radiating portion is approximately equal to 0.25 times the wavelength of a center frequency of the operating frequency band.         The antenna system according to item 1 of the patent application range, wherein the switching circuit includes: a single pole double throw switch having a common end, a first end, and a second end, wherein the common of the single pole double throw switch The terminal system is coupled to a signal source, the first terminal of the single pole double throw switch is coupled to the first feed point, and the second terminal of the single pole double throw switch is coupled to the second feed. point.         The antenna system according to item 10 of the patent application scope, wherein the switching circuit further includes: a first capacitor coupled between the signal source and the common end of the single-pole double-throw switch; a second capacitor coupled Connected between the first feed point and the first end of the single pole double throw switch; and a third capacitor coupled between the second feed point and the second end of the single pole double throw switch .         The antenna system according to item 1 of the patent application scope, wherein the first tunable antenna further comprises: a dielectric substrate having an upper surface and a lower surface, wherein the first radiating portion and the second radiating portion are disposed on The upper surface of the dielectric substrate; a metal trace disposed on the upper surface of the dielectric substrate; and a ground plane disposed on the lower surface of the dielectric substrate; wherein the transmission line is formed by the metal trace and the connection A microstrip line formed by the ground.         The antenna system according to item 12 of the patent application scope, wherein the ground plane presents an inverted T shape.         The antenna system according to item 12 of the scope of patent application, wherein a vertical projection of the metal trace on the lower surface of the dielectric substrate is completely located inside the ground plane.         The antenna system according to item 1 of the scope of patent application, wherein the phase adjustment section has a straight bar shape.         According to the antenna system described in item 1 of the patent application scope, a third feed-in point is further located at a center of one of the phase adjustment sections, and the switching circuit is further provided than the first feed-in point and the second feed-in Switching between the input point and the third input point, so that the first input point, the second input point, or the third input point can receive the input signal.         The antenna system according to item 1 of the patent application scope further includes a second tunable antenna, wherein the second tunable antenna has the same structure as the first tunable antenna.         The antenna system according to item 17 of the scope of patent application, wherein the first tunable antenna and the second tunable antenna are respectively disposed at two opposite corners of a display of a mobile device.         The antenna system as described in claim 18, wherein the mobile device is a notebook computer.         The antenna system according to item 17 of the scope of patent application, wherein the first tunable antenna and the second tunable antenna can generate different synthetic radiation field patterns.