CN107786215A - A kind of radio-frequency antenna interface electrostatic protection circuit and adjustment method - Google Patents
A kind of radio-frequency antenna interface electrostatic protection circuit and adjustment method Download PDFInfo
- Publication number
- CN107786215A CN107786215A CN201610797822.6A CN201610797822A CN107786215A CN 107786215 A CN107786215 A CN 107786215A CN 201610797822 A CN201610797822 A CN 201610797822A CN 107786215 A CN107786215 A CN 107786215A
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- China
- Prior art keywords
- radio
- frequency
- quarter
- antenna interface
- frequency antenna
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Abstract
The present invention proposes a kind of radio-frequency antenna interface electrostatic protection circuit, including：Wireless communication module, radio-frequency antenna interface, quarter-wave microstrip line and impedance matching capacitances, the radio-frequency antenna interface, for sending and receiving wireless signal；The wireless communication module, it is connected by radio frequency primary path with the radio-frequency antenna interface, for handling the wireless signal of the radio-frequency antenna interface, and the processing radio-frequency antenna interface sends required wireless signal；The quarter-wave microstrip line, one end are connected with the radio frequency primary path, and one end is connected to ground, and its length is a quarter of the operation wavelength determined by the center operating frequency of the radio frequency primary path, and its impedance is identical with the radio frequency primary path impedance；The impedance matching capacitances, one end are connected with the earth terminal of the quarter-wave microstrip line, and one end is directly grounded.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of radio-frequency antenna interface electrostatic protection circuit and debugging side
Method.
Background technology
Now widely used 3G, 4G wireless communication industry terminal, in the specific industry application demand of such as vehicular applications
In, the vehicle-mounted whip-shaped antenna of metallic rod shaped is often used, in the directly exposed air of such car antenna, strong electrostatic, induction lightening
The damage of device interior radio-frequency devices may be caused by being introduced directly into equipment by exposed antenna Deng stronger surge impact electric current.
Such sector application terminal, often there is higher transmission power, integrated surge protective device is short to the surge impact response time,
Electrostatic class surge impact can be protected well, but such device typically can not persistently bear the larger transmission power of equipment；And can
Persistently bearing the surge protective device of larger transmission power can not typically protect surge action time very short such as electrostatic class well
Surge impact.Using cavity body filter and the effective scheme of antenna opening carrying out surge protection, but cavity body filter volume is big, Shi Bizeng
The volume and weight of wireless device is added.
The content of the invention
In order to solve the problems, such as background technology proposition, the present invention proposes a kind of radio-frequency antenna interface electrostatic protection circuit, should
Circuit includes：
Wireless communication module, radio-frequency antenna interface, quarter-wave microstrip line and impedance matching capacitances,
The radio-frequency antenna interface, for sending and receiving wireless signal；
The wireless communication module, it is connected by radio frequency primary path with the radio-frequency antenna interface, for handling described penetrate
The wireless signal that frequency antennal interface receives, and the processing radio-frequency antenna interface send required wireless signal；
The quarter-wave microstrip line, one end are connected with the radio frequency primary path, and one end is connected to ground, and its length is
The a quarter of the operation wavelength determined by the center operating frequency of the radio frequency primary path, its impedance and the radio frequency primary path
Impedance is identical；
The impedance matching capacitances, one end are connected with the earth terminal of the quarter-wave microstrip line, and one end directly connects
Ground.
Preferably, the circuit uses PCB mask-making technologies.It is further preferred that according to PCB mask-making technology situations, it is described
The length of quarter-wave microstrip line can be 0.95~1.05 times of a quarter of the operation wavelength.
The present invention also proposes a kind of adjustment method of radio-frequency antenna interface electrostatic protection circuit, including：By described in regulation
The radio-frequency power of the radio frequency primary path is lost to reduce the quarter-wave microstrip line for the size of impedance matching capacitances.
Further, the radio frequency primary path one terminates signal source, a termination frequency spectrograph, the radio frequency work(is tested by the frequency spectrograph
Rate is lost.
Radio-frequency antenna interface electrostatic protection circuit provided by the invention, radio frequency mouth can be effectively protected because exposed radio frequency day
Radio-frequency devices damage caused by the surge current that line imports, and the circuit small volume, and in light weight, design and manufacture cost is low.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the radio-frequency antenna interface electrostatic protection circuit schematic diagram of the embodiment of the present invention；
Fig. 2 is that the radio-frequency antenna interface electrostatic protection circuit PCB of the embodiment of the present invention makes schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments；It should be noted that in the case where not conflicting, in the application
Embodiment and embodiment in feature can be mutually combined.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The structure of the radio-frequency antenna interface electrostatic protection circuit of the present embodiment as shown in figure 1, including：Wireless communication module
101st, radio-frequency antenna interface 102, quarter-wave microstrip line 103, impedance matching capacitances 104.
Wireless communication module 101 is a wireless communication process unit that can launch, receive wireless signal, passes through radio frequency master
Path is connected with radio-frequency antenna interface 102, is responsible for wireless signal and radio-frequency antenna interface that processing radio-frequency antenna interface 102 receives
102 send required wireless signal.
One end of quarter-wave microstrip line 103 is connected with radio frequency primary path, and one end is connected to ground.Design a quarter
During wavelength line, it is main consider it is following some：1, operation wavelength is determined according to the center operating frequency of main radio frequency path, then with four
/ mono- wavelength determines micro-strip line length；2, the impedance of quarter-wave microstrip line is identical with main radio frequency path；3, to bear
Larger surge current, quarter-wave microstrip line should be as wider as possible.
The reason for because of manufacturing process, the actually impedance of quarter-wave microstrip line 103 may not be in earth terminal
Existing infinity, so as to cause radio frequency main path signal to be decayed.In order to realize that the impedance of quarter-wave microstrip line 103 adjusts work(
Can, also in quarter-wave microstrip line 103, closely interface arranges several impedance matching capacitances 104, impedance to this circuit
It is connected with the one end of electric capacity 104 with quarter-wave microstrip line 103, one end is directly grounded, thus can be by adjusting impedance
The size of matching capacitance 104 so that ground connection of the working electromagnet ripple signal of radio frequency primary path in quarter-wave microstrip line 103
Hold as infinite-impedance, so as to reduce the radio-frequency power loss of radio frequency primary path as far as possible.
When adjusting impedance matching capacitances 104, signal source, a termination frequency spectrum can be terminated in original radio frequency primary path one
Instrument, frequency spectrograph are used for the power attenuation for testing radio frequency primary path.Adjust the work that impedance matching capacitances 104 cause radio frequency primary path
Infinite-impedance is presented in the earth terminal of quarter-wave microstrip line 104 in electromagnetic wave signal, is so measured on frequency spectrograph
Radio frequency main path signal power attenuation is minimum value.
The present embodiment circuit preferably directly using PCB mask-making technologies manufacture, PCB design making circuit diagram as shown in Fig. 2
Between wireless communication module and antennal interface and quarter-wave microstrip line is accessed (according to PCB mask-making technology situations, micro-strip
Line length can be quarter-wave 0.95~1.05 times), realized using quarter-wave microstrip line to radiofrequency signal
Isolation, because the quatrter-wavelength line line footpath is wide and short, and end is directly connected to ground, and is gushed when antenna opening has compared with high seas
During impact, the surge current can quickly introduce the earth by quatrter-wavelength line, realize the surge to radio frequency primary path device
Safeguard function.For the higher radio communication of working frequency, such as 1GHz working frequency, quarter-wave microstrip line only has
7.5cm, the quarter-wave microstrip line can be manufactured very easily using PCB microstrip designs, and volume is very small, makes life
It is very low to produce cost.
Compared with prior art, a kind of radio-frequency antenna interface electrostatic protection circuit of the present invention and designing and debugging methods are implemented
Have the advantages that：This method manufacturing cost is low, the simple compact of circuit, it is very low to original circuit loss and
It can effectively solve the problem that radio-frequency antenna mouth carrying out surge protection problem.
One of ordinary skill in the art will appreciate that：Realize above method embodiment all or part can still use it is other
Alternative performs：For example, in quarter-wave microstrip line end, the present embodiment can be replaced using inductance earthing mode
Quarter-wave microstrip line is directly grounded.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (5)
1. a kind of radio-frequency antenna interface electrostatic protection circuit, it is characterised in that the circuit includes：
Wireless communication module, radio-frequency antenna interface, quarter-wave microstrip line and impedance matching capacitances,
The radio-frequency antenna interface, for sending and receiving wireless signal；
The wireless communication module, it is connected by radio frequency primary path with the radio-frequency antenna interface, for handling the radio frequency day
The wireless signal that line interface receives, and the processing radio-frequency antenna interface send required wireless signal；
The quarter-wave microstrip line, one end are connected with the radio frequency primary path, and one end is connected to ground, and its length is by institute
State a quarter of the operation wavelength of the center operating frequency determination of radio frequency primary path, its impedance and the radio frequency primary path impedance
It is identical；
The impedance matching capacitances, one end are connected with the earth terminal of the quarter-wave microstrip line, and one end is directly grounded.
2. circuit according to claim 1, it is characterised in that：
The circuit uses PCB mask-making technologies.
3. circuit according to claim 2, it is characterised in that：
According to PCB mask-making technology situations, the length of the quarter-wave microstrip line is a quarter of the operation wavelength
0.95~1.05 times.
A kind of 4. adjustment method of the radio-frequency antenna interface electrostatic protection circuit of claim 1, it is characterised in that methods described bag
Include：
The quarter-wave microstrip line is reduced by adjusting the size of the impedance matching capacitances to lead to the radio frequency master
The radio-frequency power loss on road.
5. adjustment method according to claim 4, it is characterised in that：
The radio frequency primary path one terminates signal source, a termination frequency spectrograph, tests the radio-frequency power by the frequency spectrograph and damages
Consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610797822.6A CN107786215A (en) | 2016-08-31 | 2016-08-31 | A kind of radio-frequency antenna interface electrostatic protection circuit and adjustment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610797822.6A CN107786215A (en) | 2016-08-31 | 2016-08-31 | A kind of radio-frequency antenna interface electrostatic protection circuit and adjustment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107786215A true CN107786215A (en) | 2018-03-09 |
Family
ID=61451822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610797822.6A Withdrawn CN107786215A (en) | 2016-08-31 | 2016-08-31 | A kind of radio-frequency antenna interface electrostatic protection circuit and adjustment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107786215A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020100970A1 (en) * | 2000-12-27 | 2002-08-01 | Shoichi Kitazawa | High frequency switch, two-band type high frequency switch, three-band type high frequency switch, and mobile communication equipment |
| CN1370340A (en) * | 2000-06-14 | 2002-09-18 | 三菱电机株式会社 | Impedance matching circuit and antenna device |
| CN101282127A (en) * | 2007-04-06 | 2008-10-08 | 中兴通讯股份有限公司 | Transmit-receive switching mechanism for TDD radio communication system |
| CN201774730U (en) * | 2010-06-14 | 2011-03-23 | 国基电子（上海）有限公司 | Radio frequency device with function of electrostatic protection |
| CN202772566U (en) * | 2012-08-15 | 2013-03-06 | 杭州华三通信技术有限公司 | Radio frequency port circuit protector and PCB |
| CN104659480A (en) * | 2015-02-13 | 2015-05-27 | 深圳市大疆创新科技有限公司 | Impedance matching structure, antenna assembly and aircraft as well as impedance matching method of aircraft |
-
2016
- 2016-08-31 CN CN201610797822.6A patent/CN107786215A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370340A (en) * | 2000-06-14 | 2002-09-18 | 三菱电机株式会社 | Impedance matching circuit and antenna device |
| US20020100970A1 (en) * | 2000-12-27 | 2002-08-01 | Shoichi Kitazawa | High frequency switch, two-band type high frequency switch, three-band type high frequency switch, and mobile communication equipment |
| CN101282127A (en) * | 2007-04-06 | 2008-10-08 | 中兴通讯股份有限公司 | Transmit-receive switching mechanism for TDD radio communication system |
| CN201774730U (en) * | 2010-06-14 | 2011-03-23 | 国基电子（上海）有限公司 | Radio frequency device with function of electrostatic protection |
| CN202772566U (en) * | 2012-08-15 | 2013-03-06 | 杭州华三通信技术有限公司 | Radio frequency port circuit protector and PCB |
| CN104659480A (en) * | 2015-02-13 | 2015-05-27 | 深圳市大疆创新科技有限公司 | Impedance matching structure, antenna assembly and aircraft as well as impedance matching method of aircraft |
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| PB01 | Publication | ||
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Application publication date: 20180309 |