TW201616807A - Impedance matching circuit - Google Patents

Impedance matching circuit Download PDF

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Publication number
TW201616807A
TW201616807A TW103137207A TW103137207A TW201616807A TW 201616807 A TW201616807 A TW 201616807A TW 103137207 A TW103137207 A TW 103137207A TW 103137207 A TW103137207 A TW 103137207A TW 201616807 A TW201616807 A TW 201616807A
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TW
Taiwan
Prior art keywords
end
coupled
capacitor
inductor
antenna
Prior art date
Application number
TW103137207A
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Chinese (zh)
Inventor
葉明豪
Original Assignee
深圳市南方硅谷微電子有限公司
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Filing date
Publication date
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Priority to TW103137207A priority Critical patent/TW201616807A/en
Publication of TW201616807A publication Critical patent/TW201616807A/en

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Abstract

An impedance matching circuit is coupled to an antenna. The impedance matching circuit includes a standard impedance adjustment circuit and a passive component. The standard impedance adjustment circuit adjusts the impedance between the antenna and the signal feed 等于 equal to the standard impedance value. Passive components are used to provide a non-zero reactance. The passive component generates at least one intersection of the reflection coefficient curve of the antenna and the impedance matching circuit through the provided reactance.

Description

Impedance matching circuit

The present invention relates to an impedance matching circuit, and more particularly to an antenna impedance matching circuit that increases bandwidth.

With the evolution of electronic technology, electronic products with communication capabilities have become a must-have tool for modern people's daily lives. In order to provide convenient and fast wireless communication capabilities, it is an important issue to provide an excellent antenna device on an electronic device.

In terms of the performance of the antenna device, the performance of the antenna device can be calculated by the ratio of the energy emitted by the antenna to the energy of the signal being fed. The factors affecting the performance of the antenna device may include antenna impedance matching, space for configuring the antenna, material of the antenna, mechanism design of the antenna device mechanism, and radiation energy loss caused by the surrounding environment of the antenna.

Under the general definition, the antenna bandwidth is the observation antenna reflection coefficient, based on -10dB as the design basis. Under such conditions, about 90% of the energy can be smoothly transmitted to the body of the antenna for radiation. The impedance of the antenna device can be designed with a standard impedance of 50 ohms. Referring to FIG. 10 , it can be seen from the frequency response diagram of the conventional antenna shown in FIG. 10 that the impedance is often used by conventional techniques. The circuit is designed with a 50 ohm standard impedance in conjunction with a planar inverted-F antenna (PIFA) with a bandwidth of approximately 120 megahertz (MHz).

When the impedance of the antenna device is closer to the standard impedance, it means that the system has better impedance matching, thereby improving the radiation efficiency of the antenna. In contrast, as the impedance of the antenna device is farther away from the standard impedance, the energy of the wireless signal radiated by the antenna is reduced and the quality of the transmitted signal may be mutated. This situation is more pronounced for the channel for signal transmission at the edge of the bandwidth edge.

It can be seen from the above that if the bandwidth of the antenna device can be increased, the performance of the antenna device can be improved. Therefore, designing a large bandwidth antenna device is an important issue in wireless signal transmission.

The invention provides a plurality of impedance matching circuits applied to an antenna, which effectively increases the bandwidth of the antenna.

The invention provides an impedance matching circuit, and an impedance matching circuit is coupled to the antenna. The impedance matching circuit includes a standard impedance adjustment circuit and a passive component. The first end of the standard impedance adjustment circuit is coupled to the signal feed port to adjust the impedance between the antenna and the signal feed port to be equal to the standard impedance value. The passive component is configured to provide a non-zero reactance coupled to the second end of the standard impedance adjustment circuit and to the antenna. Wherein, the passive component generates at least one intersection of the reflection coefficient curve of the antenna through the provided reactance.

In an embodiment of the invention, the passive component includes at least one first inductance. The first end of the first inductor is coupled to the second end of the standard impedance adjustment circuit And an antenna, the second end of the first inductor is coupled to the reference ground.

In an embodiment of the invention, the antenna is a dual frequency antenna.

In an embodiment of the invention, the passive component includes at least one first inductance. The first end of the first inductor is coupled to the second end of the standard impedance adjusting circuit, and the second end of the first inductor is coupled to the antenna.

In an embodiment of the invention, the passive component includes at least one first capacitor. The first end of the first capacitor is coupled to the second end of the standard impedance adjusting circuit and the antenna, and the second end of the first capacitor is coupled to the reference ground.

In an embodiment of the invention, the passive component includes at least one first capacitor. The first end of the first capacitor is coupled to the second end of the standard impedance adjusting circuit, and the second end of the first capacitor is coupled to the antenna.

The invention further provides an impedance matching circuit, and the impedance matching circuit is coupled to the dual frequency antenna. The impedance matching circuit includes a standard impedance adjustment circuit and a passive component. The first end of the standard impedance adjustment circuit is coupled to the signal feed port to adjust the impedance between the dual-frequency antenna and the signal feed port to be equal to the standard impedance value. The passive component is used to provide a non-zero reactance coupled to the second end of the standard impedance adjustment circuit and the dual frequency antenna. Wherein, the passive component generates at least one intersection of the reflection coefficient curve of the dual-frequency antenna through the provided reactance.

Based on the above, the present invention generates a passive component that provides a non-zero reactance in the impedance matching circuit, and transmits the reflection coefficient curve of the impedance matching circuit in the Smith chart at least once by configuring the passive component. cross. With such a setting, the bandwidth of the impedance matching circuit can be effectively increased.

The above described features and advantages of the invention will be apparent from the following description.

100, 300, 400, 500, 600, 800‧‧‧ impedance matching circuit

ANT‧‧‧Antenna

ANT2‧‧‧Dual Band Antenna

110, 310, 410, 510, 610, 810‧‧‧ standard impedance adjustment circuit

120, 320, 420, 520, 620, 910~940‧‧‧ Passive components

820‧‧‧ Passive component circuit

FP‧‧‧Signal feed埠

P1~P5‧‧‧ reference point

P7~P8‧‧‧ regional lows

710‧‧‧ frequency response curve

RC, RC1‧‧‧ reflection coefficient curve

C31, C32, C41, C51, C52, C53, C61, C62, C63, C71, C72‧‧‧ capacitors

L31, L32, L41, L42, L43, L51, L61, L71, L72, L73‧‧‧ inductance

GND‧‧‧reference ground

1 is a schematic diagram of an impedance matching circuit of an antenna device according to an embodiment of the present invention.

2A is a Smith chart corresponding to the antenna ANT of the embodiment of FIG. 1 and the impedance matching circuit 100 of the present invention.

2B is a diagram showing the frequency response of the antenna ANT of the embodiment of FIG. 1 corresponding to the impedance matching circuit 100 of the present invention.

3 is a schematic diagram of an impedance matching circuit according to another embodiment of the present invention.

4 is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention.

FIG. 5 is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention.

6 is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention.

FIG. 7 is a diagram showing a frequency response of an embodiment of the present invention.

FIG. 8A is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention.

8B and 8C are respectively a Smith chart and a frequency response diagram of the antenna device of FIG. 8A.

9A-9D are schematic diagrams showing the arrangement of passive components according to an embodiment of the present invention.

FIG. 10 is a diagram showing the frequency response of a conventional antenna.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an impedance matching circuit of an antenna device according to an embodiment of the present invention. The impedance matching circuit 100 is coupled to the antenna ANT, including the standard impedance adjustment circuit 110 and the passive component 120. The first end of the standard impedance adjustment circuit 110 is coupled to the signal feed 埠 FP , and the second end of the standard impedance adjustment circuit 110 is coupled to the passive component 120 . The standard impedance adjustment circuit 110 can be used to adjust the impedance between the antenna ANT and the signal feed 埠FP to a standard impedance value. In this embodiment, the standard impedance value can be 50 ohms. The standard impedance adjustment circuit 110 increases the transmission efficiency of the antenna ANT by adjusting the impedance between the antenna ANT and the signal feed 埠FP to 50 ohms.

The passive component 120 is further coupled to the antenna ANT. The passive component 120 can provide a non-zero reactance and pass the provided reactance to cause the antenna ANT and the impedance matching circuit 100 to produce at least one intersection in the corresponding reflection coefficient curve in the Smith chart. Referring to FIG. 1 , FIG. 2A and FIG. 2B , FIG. 2A illustrates a Smith chart corresponding to the antenna ANT and the impedance matching circuit 100 of the embodiment of the present invention, and FIG. 2B illustrates the antenna of the embodiment of FIG. 1 of the present invention. A frequency response diagram of ANT corresponding to impedance matching circuit 100.

In FIG. 2A, the crossover phenomenon can be generated at the reference point P1 of the reflection coefficient curve RC1 through the reactance provided by the passive element 120. In addition, the standard impedance adjustment circuit 110 adjusts the reference point P1 to a position corresponding to a standard impedance (for example, 50 ohms). As can be understood from the above description, the reference point P1 is actually formed by superimposing two points on the reflection coefficient curve RC1. In the mode of adjusting the reference point P1 to the standard impedance, it can be seen that the reflection coefficient curve RC1 actually has two points matched. To a position close to the standard impedance.

Corresponding to FIG. 2B, the reference points P4 and P5 correspond to a position of -10 dB, and in FIG. 2A, the positions of the reference points P4 and P5 will be far from the center of the circle, that is, the antenna device formed by the impedance matching circuit 100 and the antenna ANT The bandwidth can be effectively increased. In addition, in FIG. 2B, a local minimum is formed between the reference points P4 and P1, and another position low is formed between the reference points P2 and P3 and close to the reference point P3.

The bandwidth of the antenna ANT of the embodiment of the present invention can be effectively expanded to about 220 MHz. Compared with the conventional technique shown in FIG. 10, the bandwidth of the antenna ANT of the embodiment of the present invention is effectively improved.

It is worth mentioning that the passive component 120 in the embodiment of the present invention is a circuit component that can provide a non-zero reactance. For example, passive component 120 can be a capacitor or an inductor. The manner in which the passive component 120 is connected to the antenna ANT and the standard impedance adjustment circuit 110 is not limited. The focus is on the reflection coefficient curve RC of the antenna ANT corresponding to the impedance matching circuit 100 through the passive component 120 in any connection form. Any one of which can be generated at least once can be applied to the present invention.

Please refer to FIG. 3, which is a schematic diagram of an impedance matching circuit according to another embodiment of the present invention. The impedance matching circuit 300 is coupled to the antenna ANT and includes a standard impedance adjustment circuit 310 and a passive component 320. In the present embodiment, the passive component 320 is an inductor L31. One end of the inductor L31 is coupled to the antenna ANT, and the other end is coupled to the standard impedance adjusting circuit 310. The standard impedance adjustment circuit 310 is coupled to the inductor L31 and coupled to the signal feed port FP. Standard impedance adjustment circuit 310 includes Inductor L32 and capacitors C31 and C32. The first end of the capacitor C31 is coupled to the signal feed 埠FP, and the second end of the capacitor C31 is coupled to the reference ground GND. The first end of the inductor L31 is coupled to the first end of the capacitor C31 and the signal is fed to the 埠FP. In addition, the second end of the inductor L31 is coupled to the first end of the capacitor C32. The second end of the capacitor C32 is coupled to the reference ground GND.

In the present embodiment, the inductor L31 connected in series with the antenna ANT and the standard impedance adjusting circuit 310 is used as the passive component 320, and the reflection characteristic curve is generated at least once, and then the intersection is matched by the standard impedance adjusting circuit 310. To standard impedance value. As a result, the bandwidth of the antenna device is effectively increased, and the signal transmission efficiency of the antenna ANT is improved.

Referring to FIG. 4, FIG. 4 is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention. The impedance matching circuit 400 is coupled to the antenna ANT and includes a standard impedance adjustment circuit 410 and a passive component 420. In the present embodiment, the passive component 420 is an inductor L41. One end of the inductor L41 is coupled to the antenna ANT, and the other end is coupled to the reference ground GND. The standard impedance adjustment circuit 410 is coupled between the inductor L41 and the signal feed 埠FP. The standard impedance adjustment circuit 410 includes inductors L42 and L43 and a capacitor C41. The first end of the inductor L42 is coupled to the signal feed 埠FP, and the second end of the inductor L42 is coupled to the first end of the inductor L43. The second end of the inductor L43 is coupled to the reference ground GND. The first end of the capacitor C41 is coupled to the second end of the inductor L43. In addition, the second end of the capacitor C41 is the antenna ANT and the first end of the inductor L41.

In this embodiment, the antenna is connected to the reference ground GND through the antenna ANT. The inductor L41 acts as the passive component 420, and thereby causes the reflection characteristic curve to intersect at least once, and then the standard impedance adjustment circuit 410 matches the intersection point to the standard impedance value to improve the bandwidth of the antenna device and its signal transmission efficiency.

Referring to FIG. 5, FIG. 5 is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention. The impedance matching circuit 500 is coupled to the antenna ANT and includes a standard impedance adjustment circuit 510 and a passive component 520. In the present embodiment, the passive component 520 is a capacitor C51. The first end of the capacitor C51 is coupled to the antenna ANT, and the second end is coupled to the reference ground GND. The standard impedance adjustment circuit 510 is coupled between the capacitor C51 and the signal feed 埠FP. The standard impedance adjustment circuit 510 includes an inductor L51 and capacitors C52 and C53. The first end of the capacitor C52 is coupled to the signal feed 埠FP, and the second end of the capacitor C52 is coupled to the first end of the capacitor C53. The second end of the capacitor C53 is coupled to the reference ground GND. The first end of the inductor L51 is coupled to the first end of the capacitor C53, and the second end of the inductor L51 is coupled to the antenna ANT and the first end of the capacitor C51.

In the present embodiment, the capacitor C51 connected between the antenna ANT and the reference ground GND is used as the passive component 520, and the reflection characteristic curve is generated at least once, and then the intersection is matched to the intersection by the standard impedance adjustment circuit 510. Standard impedance value to increase the bandwidth of the antenna device and its signal transmission efficiency.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention. The impedance matching circuit 600 is coupled to the antenna ANT and includes a standard impedance adjustment circuit 610 and a passive component 620. In the present embodiment, the passive component 620 is a capacitor C61. The first end of the capacitor C61 is coupled to the antenna ANT, and the second end thereof Then coupled to the standard impedance adjustment circuit 610. The standard impedance adjustment circuit 610 is coupled between the capacitor C61 and the signal feed 埠FP. The standard impedance adjustment circuit 610 includes an inductor L61 and capacitors C62 and C63. The first end of the capacitor C62 is coupled to the signal feed 埠FP, and the second end of the capacitor C62 is coupled to the reference ground GND. The first end of the capacitor C63 is coupled to the signal feed 埠FP, and the second end of the capacitor C63 is coupled to the first end of the inductor L61. The second end of the inductor L61 is coupled to the reference ground GND.

In this embodiment, the capacitor C61 connected between the antenna ANT and the standard impedance adjusting circuit 610 is used as the passive component 620, and the reflection characteristic curve is generated at least once, and then the intersection is matched to the standard impedance adjusting circuit 610. Standard impedance value to increase the bandwidth of the antenna device and its signal transmission efficiency.

It should be noted that the antenna ANT in the foregoing embodiments of FIG. 3 to FIG. 6 may be any single-frequency antenna, such as a Planar Inverted F Antenna (PIFA) or an inverted F antenna (IFA type antenna). ), a monopole antenna, an open slot antenna, a chip antenna, etc., without a fixed limit.

It is particularly noteworthy that, by the above-described embodiments, by adjusting the capacitance of the capacitor and the inductance of the inductor, the single-frequency antenna ANT can generate a signal transmission effect with dual frequency. The frequency response diagram is as shown in FIG. In FIG. 7, through the passive component and the impedance matching circuit, the frequencies corresponding to the low points P7 and P8 of the two regions in the frequency response curve 710 of the antenna ANT can be effectively pulled apart, so that the antenna ANT can have double The effect of frequency signal transmission.

With the above embodiments, the antenna ANT of the embodiment of the present invention can be It is allocated to the frequency band 38 and the frequency band 40 of the 4G Time Division Long Term Evolution (TD-LTE) format. Among them, the frequency band of the frequency band 38 is between 2570MHz and 2620MHz, and the frequency band of the frequency band 38 is between 2300MHz and 2400MHz.

In addition, the embodiment of the present invention can also be applied to a multi-frequency antenna. Referring to FIG. 8A, FIG. 8A is a schematic diagram of an impedance matching circuit according to still another embodiment of the present invention. The impedance matching circuit 800 is coupled to the dual frequency antenna ANT2 and includes a standard impedance adjustment circuit 810 and a passive component circuit 820. The dual-frequency antenna AN2 can be a dual-frequency antenna. For example, the dual-band antenna ANT2 can be applied to the Global System for Mobile Communications (GSM) 900 and the Digital Cellular System (DCS) 1800. The format of the signal transmission action.

The passive component circuit 820 includes an inductor L71 and a capacitor C71. The inductor L71 and the capacitor C71 are connected to each other and are coupled between the dual-band antenna ANT2 and the reference ground GND.

The standard impedance adjustment circuit 810 includes capacitors C72, C73 and inductors L72 and L73. The first end of the capacitor C72 is coupled to the signal feed 埠FP, and the second end of the capacitor C72 is coupled to the reference ground GND. The inductor L72 is connected in parallel with the capacitor C72, wherein the inductor L72 is coupled between the signal feed 埠FP and the reference ground GND. The first end of the inductor L73 is coupled to the signal feed 埠FP, and the second end of the inductor L73 is coupled to the first end of the capacitor C73. In addition, the second end of the capacitor C73 is coupled to the first end of the inductor L71 and the antenna ANT2.

Regarding the Smith chart and the frequency response map of the antenna device of FIG. 8A, please refer to FIG. 8B and FIG. 8C, respectively. Here, in FIG. 8B, the reflection coefficient curve RC on the Smith chart produces two intersections, and one of the intersections is matched to the position of the standard impedance. Also, in Fig. 8C, the bandwidth of one of the frequency bands is effectively boosted.

Please refer to FIG. 9A to FIG. 9D for a schematic diagram of a configuration of a passive component according to an embodiment of the present invention. In FIG. 9A, the passive component 910 is a single inductor formed in the form of a wire, and one end of the inductor is connected to the antenna ANT, and the other end is directly connected to the ground. In addition, in FIG. 9B, the passive component 920 is formed by connecting two inductors formed by wires. In another aspect, in Figure 9C, the passive component 930 utilizes a short wire segment to form an equivalent inductance, while in Figure 9D, the passive component 940 utilizes a short wire segment as in Figure 9C, plus a parallel connection. The inductance of the lumped (lump) is constructed.

In summary, the present invention provides a non-zero reactance passive component and effectively increases the bandwidth of the antenna device by adjusting the reflection coefficient curve to generate at least one crossing. In this way, the impedance matching effect of the antenna can be improved, and the influence of the RF active component caused by the antenna impedance mismatch is reduced, and the signal transmission efficiency of the antenna is improved. In addition, the practice of the present invention focuses only on the adjustment of the reflection coefficient curve, and there is no limitation on the application level regardless of the type of the antenna.

100‧‧‧ impedance matching circuit

ANT‧‧‧Antenna

110‧‧‧Standard impedance adjustment circuit

120‧‧‧ Passive components

FP‧‧‧Signal feed埠

Claims (10)

  1. An impedance matching circuit is coupled to an antenna, comprising: a standard impedance adjusting circuit, the first end of which is coupled to a signal feeding port for adjusting the impedance between the antenna and the signal feeding port to a standard impedance value And a passive component for providing a non-zero reactance coupled to the second end of the standard impedance adjustment circuit and the antenna, wherein the passive component generates a reflection coefficient curve of the antenna through the provided reactance Cross at least once.
  2. The impedance matching circuit of claim 1, wherein the passive component comprises: at least one first inductor coupled between the standard impedance adjusting circuit and the antenna.
  3. The impedance matching circuit of claim 2, wherein the first end of the first inductor is coupled to the standard impedance adjusting circuit, and the second end of the first inductor is coupled to a reference ground, the standard The impedance adjustment circuit includes: a second inductor having a first end coupled to the signal feed 埠; a third inductor having a first end coupled to the second end of the second inductor, the second inductor being second The first end of the capacitor is coupled to the first end of the third inductor, and the second end of the capacitor is coupled to the first end of the first inductor.
  4. The impedance matching circuit of claim 2, wherein the first end of the first inductor is coupled to the second end of the standard impedance adjusting circuit, and the second end of the first inductor is coupled to the antenna, The standard impedance adjustment circuit includes: a first capacitor having a first end coupled to the signal feed 埠, a second end of the first capacitor coupled to a reference ground; a second inductor coupled to the first end of the first capacitor The first end of the second inductor is coupled to the first end of the first inductor, and the second end is coupled to the second end of the second inductor, the second capacitor is coupled To the reference ground.
  5. The impedance matching circuit of claim 1, wherein the passive component comprises: at least one first capacitor coupled between the standard impedance adjusting circuit and the antenna.
  6. The impedance matching circuit of claim 5, wherein the first end of the first capacitor is coupled to the second end of the standard impedance adjusting circuit and the antenna, and the second end of the first capacitor is coupled to a reference grounding terminal, the standard impedance adjusting circuit includes: a second capacitor having a first end coupled to the signal feed port; a third capacitor having a first end coupled to the first end of the second capacitor a second end of the third capacitor is coupled to the reference ground; and a first end is coupled to the first end of the third capacitor, the second end of the first inductor is coupled to The first end of the first capacitor.
  7. The impedance matching circuit of claim 5, wherein the first end of the first capacitor is coupled to the second end of the standard impedance adjusting circuit, and the second end of the first capacitor is coupled to the antenna, The standard impedance adjustment circuit includes: a second capacitor, the first end of which is coupled to the signal feed port, and the second capacitor The second end is coupled to the first ground end; the first end is coupled to the first end of the second capacitor; and the first end is coupled to the third capacitor The second end of the first inductor is coupled to the first end of the first capacitor.
  8. An impedance matching circuit coupled to a dual-frequency antenna includes: a standard impedance adjustment circuit, the first end of which is coupled to a signal feed port for adjusting an impedance between the dual-frequency antenna and the signal feed-in a standard impedance value; and a passive component circuit for providing a non-zero reactance coupled to the second end of the standard impedance adjustment circuit and the dual frequency antenna, wherein the passive component transmits the reactance provided The reflection coefficient curve of the antenna produces at least one intersection.
  9. The impedance matching circuit of claim 8, wherein the passive component circuit comprises: a first capacitor connected in series between the dual frequency antenna and a reference ground; and a first inductor connected in series Between the dual frequency antenna and the reference ground.
  10. The impedance matching circuit of claim 9, wherein the standard impedance adjusting circuit comprises: a second inductor, the first end of which is coupled to the signal feeding port, and the second end of the second inductor is coupled To the reference ground; a third inductor having a first end coupled to the signal feed port; a second capacitor coupled in series between the signal feed port and the reference ground; A third capacitor is coupled to the second end of the third inductor, and the second end of the third capacitor is coupled to the dual-band antenna.
TW103137207A 2014-10-28 2014-10-28 Impedance matching circuit TW201616807A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
TW103137207A TW201616807A (en) 2014-10-28 2014-10-28 Impedance matching circuit
CN201410720169.4A CN105655726A (en) 2014-10-28 2014-12-02 Impedance matching circuit

Publications (1)

Publication Number Publication Date
TW201616807A true TW201616807A (en) 2016-05-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI662799B (en) * 2018-03-07 2019-06-11 英業達股份有限公司 Antenna and signal input circuit thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108199132A (en) * 2017-12-29 2018-06-22 瑞声精密制造科技(常州)有限公司 A kind of antenna system and terminal
CN108923788A (en) * 2018-06-06 2018-11-30 武汉博畅通信设备有限责任公司 A kind of 30 ~ 88MHZ four-in-one combiner based on impedance matching network

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Publication number Priority date Publication date Assignee Title
JP2826433B2 (en) * 1993-02-26 1998-11-18 アンテン株式会社 Dual frequency matching circuit for antenna
US9270249B2 (en) * 2012-08-20 2016-02-23 Htc Corporation Tunable impedance matching circuit
US10027025B2 (en) * 2012-08-29 2018-07-17 Htc Corporation Mobile device and antenna structure therein

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI662799B (en) * 2018-03-07 2019-06-11 英業達股份有限公司 Antenna and signal input circuit thereof

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