CN203747781U - Switching circuit between the inner and outer parts of antenna - Google Patents
Switching circuit between the inner and outer parts of antenna Download PDFInfo
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- CN203747781U CN203747781U CN201420156486.3U CN201420156486U CN203747781U CN 203747781 U CN203747781 U CN 203747781U CN 201420156486 U CN201420156486 U CN 201420156486U CN 203747781 U CN203747781 U CN 203747781U
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- switching device
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- diode
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Abstract
The utility model discloses a switching circuit between the inner and outer parts of an antenna, which comprises a resistor R1, inductances L1 and L2, capacitors C1, C2, and C3 and switch components SA1, SA2, SA3 and SA4. One end of R1, one end of SA 3, one end of SA4 and C2 are connected through their positive electrodes. The other end of R1 is connected to the ground. The other end of SA3 is connected with one end of SA2. The other end of SA2 is connected with the positive electrode of C3 and one end of L2. The other end of SA4 is connected with one end of SA1. The other end of SA1 is connected with the negative electrode of C1 and one end of L1. The utility model solves the problem that when an outer circuit loses current for large resistance imposed thereon, reflected signals will make the outputted standing waves enlarged and the reflected signals also reduce economic gain. In addition, the utility model also requires a low cost to make.
Description
Technical field
The utility model relates to field of antenna, relates in particular to a kind of inside and outside antenna switching circuit.
Background technology
In the handheld device of existing location, for improving accuracy and the reliability of measuring, all leave the interface of external antenna, the radiofrequency signal of external antenna need to be given to subordinate's board and process after built-in aerial delivery outlet closes road, generally closing road scheme has and directly closes road, power splitter He Lu, adds amplifier and close road etc., but all has some problems:
1. when not connecing external antenna, external interface is in open-circuit condition, and the total reflection on microstrip line of built-in aerial signal, causes signal distortion, affects receptivity;
2. reflected signal causes output port standing-wave ratio ripple large, and is difficult to eliminate by other means;
3.Yin He road debugging index is more, and combination loss is difficult to reduce, so external antenna access Insertion Loss is larger;
4. the wire length between external antenna interface and built-in aerial interface is indefinite, so be difficult to solve in the debug phase problem of resonance frequency;
5. while solving the large problem of external Insertion Loss with amplifier, increase power consumption and the size of antenna, improved antenna cost.
Utility model content
The purpose of this utility model is to provide a kind of inside and outside antenna switching circuit, to improve the insertion loss on the impact of built-in antenna performance and external antenna under existing external antenna open circuit and connection status.
The utility model discloses a kind of inside and outside antenna switching circuit, comprise resistance R 1; Inductance L 1, L2; Capacitor C 1, C2, C3 and switching device SA1, SA2, SA3, SA4; Described
Resistance R 1 one end, the positive pole of one end of switching device SA3, SA4 and capacitor C 2 connects;
The other end ground connection of resistance R 1;
The other end of switching device SA3 is connected with one end of switching device SA2, and the other end of switching device SA2 is connected with the positive pole of capacitor C 3 and one end of inductance L 2 respectively;
The other end of switching device SA4 is connected with one end of switching device SA1, and the other end of switching device SA1 is connected with the negative pole of capacitor C 1 and one end of inductance L 1 respectively.
Preferably, between described switching device SA1 and SA4, be also serially connected with N switching device, wherein, N >=1.
Preferably, between described switching device SA2 and SA3, be also serially connected with N switching device, wherein, N >=1.
Preferably, described switching device is diode or triode.
Preferably, described diode is PIN diode.
Preferably, described triode is radio frequency field effect transistor.
The utility model is used switching device to form radio frequency commutation circuit, has realized the isolation of the inside and outside circuits of antenna, and external antenna insertion loss is reduced, and has at least reduced the combination loss of 3dB; While having solved because of external open circuit, reflected signal causes exporting problem and the reflected signal that standing wave is large and causes the problem that gains and reduce, and cost is lower.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a part of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the theory diagram of the utility model preferred embodiment.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, be the theory diagram of the utility model preferred embodiment; In the present embodiment, switching device is selected PIN diode.
The present embodiment circuit comprises resistance R 1; Inductance L 1, L2; Capacitor C 1, C2, C3 and diode D1, D2, D3, D4;
Resistance R 1 one end, the positive pole of the negative pole of diode D3, D4 and capacitor C 2 connects, the other end ground connection of resistance R 1; Diode D1 negative pole is connected with diode D4 is anodal, and positive pole is connected with the negative pole of capacitor C 1 and one end of inductance L 1 respectively; Diode D2 negative pole is connected with diode D3 is anodal, and positive pole is connected with the positive pole of described capacitor C 3 and one end of inductance L 2 respectively.
In figure, X point is built-in aerial start signal, and Y point is external antenna start signal, X/Y two signal mutual exclusions, and when X is high level, Y is low level, vice versa; A is built-in aerial radio frequency output signal, and B is external antenna radio frequency output signal, and C point, for radio frequency closes road output signal, is given to subordinate's board.
When external antenna does not access, built-in aerial is opened, and X level point is high, and Y point is low level, diode D1, D4 diode current flow, and built-in aerial radiofrequency signal arrives C point from A point by diode D1, D4.Now diode D2, D3, because reversed bias voltage ends, realize the isolation of outer circuits.
When external antenna accesses, Y level point is high, and X point is low level, diode D2, D3 conducting, and external antenna radiofrequency signal arrives C point from B point by diode D2, D3.Now diode D1, D4, because reversed bias voltage ends, realize the isolation of built-in circuit.
Because of interior external antenna, realized in time isolation, influenced each other and eliminated, avoided directly closing road, merit combiner, amplifies the problems of closing the schemes such as road.
In other embodiments, switching device can also be diode or the triode of other types, as radio frequency field effect transistor, as long as can realize the components and parts of above-mentioned functions, all can use.
In order to improve the isolation of inside and outside circuits, can increase multiple-pole switch device, as three grades, level Four etc., that is to say, in theory, between diode D1 and D4, also can be serially connected with respectively N switching device between D2 and D3, wherein, N >=1.
Above-mentioned explanation illustrates and has described preferred embodiment of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can, in utility model contemplated scope described herein, by technology or the knowledge of above-mentioned instruction or association area, change.And the change that those skilled in the art carry out and variation do not depart from spirit and scope of the present utility model, all should be in the protection range of the utility model claims.
Claims (6)
1. an antenna switching circuit inside and outside, is characterized in that, described circuit comprises resistance R 1; Inductance L 1, L2; Capacitor C 1, C2, C3 and switching device SA1, SA2, SA3, SA4; Described
Resistance R 1 one end, the positive pole of one end of switching device SA3, SA4 and capacitor C 2 connects;
The other end ground connection of resistance R 1;
The other end of switching device SA3 is connected with one end of switching device SA2, and the other end of switching device SA2 is connected with the positive pole of capacitor C 3 and one end of inductance L 2 respectively;
The other end of switching device SA4 is connected with one end of switching device SA1, and the other end of switching device SA1 is connected with the negative pole of capacitor C 1 and one end of inductance L 1 respectively.
2. inside and outside antenna switching circuit as claimed in claim 1, is characterized in that, is also serially connected with N switching device between described switching device SA1 and SA4, wherein, and N >=1.
3. inside and outside antenna switching circuit as claimed in claim 1 or 2, is characterized in that, is also serially connected with N switching device between described switching device SA2 and SA3, wherein, and N >=1.
4. inside and outside antenna switching circuit as claimed in claim 3, is characterized in that, described switching device is diode or triode.
5. inside and outside antenna switching circuit as claimed in claim 4, is characterized in that, described diode is PIN diode.
6. inside and outside antenna switching circuit as claimed in claim 4, is characterized in that, described triode is radio frequency field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420156486.3U CN203747781U (en) | 2014-04-01 | 2014-04-01 | Switching circuit between the inner and outer parts of antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420156486.3U CN203747781U (en) | 2014-04-01 | 2014-04-01 | Switching circuit between the inner and outer parts of antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747781U true CN203747781U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420156486.3U Expired - Fee Related CN203747781U (en) | 2014-04-01 | 2014-04-01 | Switching circuit between the inner and outer parts of antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747781U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552523A (en) * | 2016-01-22 | 2016-05-04 | 青岛海信移动通信技术股份有限公司 | Mobile terminal and antenna thereof |
| CN105610420A (en) * | 2015-12-21 | 2016-05-25 | 深圳市科陆电子科技股份有限公司 | Multichannel ultrahigh-frequency RFID antenna switch switcher |
| CN109921809A (en) * | 2019-03-28 | 2019-06-21 | 深圳市太赫兹科技创新研究院有限公司 | A kind of double antenna switching circuit and dual-antenna switch mechanism |
-
2014
- 2014-04-01 CN CN201420156486.3U patent/CN203747781U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610420A (en) * | 2015-12-21 | 2016-05-25 | 深圳市科陆电子科技股份有限公司 | Multichannel ultrahigh-frequency RFID antenna switch switcher |
| CN105552523A (en) * | 2016-01-22 | 2016-05-04 | 青岛海信移动通信技术股份有限公司 | Mobile terminal and antenna thereof |
| CN105552523B (en) * | 2016-01-22 | 2019-01-25 | 青岛海信移动通信技术股份有限公司 | A kind of antenna and mobile terminal of mobile terminal |
| CN109921809A (en) * | 2019-03-28 | 2019-06-21 | 深圳市太赫兹科技创新研究院有限公司 | A kind of double antenna switching circuit and dual-antenna switch mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 |