CN203135864U - Automatic switching circuit of internal antenna and external antenna - Google Patents
Automatic switching circuit of internal antenna and external antenna Download PDFInfo
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- CN203135864U CN203135864U CN201320096414XU CN201320096414U CN203135864U CN 203135864 U CN203135864 U CN 203135864U CN 201320096414X U CN201320096414X U CN 201320096414XU CN 201320096414 U CN201320096414 U CN 201320096414U CN 203135864 U CN203135864 U CN 203135864U
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Abstract
The utility model discloses an automatic switching circuit of an internal antenna and an external antenna. The automatic switching circuit of the internal antenna and the external antenna comprises an automatic switching circuit and a radio frequency switch, wherein the radio frequency switch is provided with an internal active antenna input port, an external active antenna input port, a signal output port, a control port, a grounding port and a power supply port; and the radio frequency switch is electrically connected with the automatic switching circuit by the external active antenna input port and the signal output port. By adopting the utility model, the radio frequency switch with high isolation is arranged in the automatic switching circuit, and under the control of the automatic switching circuit, the radio frequency signals of the internal antenna and the external antenna are connected to a main board and automatically switched, the interference of the external active antenna interface on the internal active antenna signal is effectively solved, and the isolation degree between the external active antenna interface and the internal active antenna interface is improved.
Description
Technical field
The utility model relates to a kind of commutation circuit, relates in particular to be equipped with the source antenna automatic switch-over circuit inside and outside a kind of.
Background technology
Distinguish from modes of emplacement, the active antenna of satellite navigation terminal can be divided into and is built-in with source antenna and external active antenna.Generally speaking, the satellite navigation terminal acquiescence is used and is built-in with source antenna, when being built-in with the poor signal of source antenna, can insert external active antenna, and automatically switch to external active antenna operating state.That is: when not connecing external active antenna, be built-in with source antenna energy operate as normal, mainboard receives the radiofrequency signal that is built-in with source antenna; When plugging external active antenna, be built-in with source antenna and quit work automatically, mainboard receives the radiofrequency signal of external active antenna; If pull out external active antenna, be built-in with source antenna and start working again.
At present, as shown in Figure 1, the automatic switchover that is equipped with source antenna inside and outside the satellite navigation terminal realizes by being equipped with the source antenna automatic switch-over circuit inside and outside one of the design in low noise amplifier circuit, and the radio frequency output that is equipped with source antenna inside and outside in the automatic switch-over circuit directly is connected to the rf inputs mouth of mainboard by microstrip line.When not connecing external antenna, mainboard is for the low-noise amplification circuit that is built-in with source antenna provides the DC power supply of 3V, make be built-in with source antenna can operate as normal, and receive its radiofrequency signal; When plugging external active antenna, mainboard provides the DC power supply of 3V for external active antenna, make external active antenna work and receive its radiofrequency signal, cut off mainboard simultaneously and be connected with the power supply of the low-noise amplification circuit that is built-in with source antenna, make to be built-in with source antenna and to quit work.But, since inside and outside to be equipped with between the interface of source antenna isolation too low, external active antenna port produces shunting to the radiofrequency signal that is built-in with source antenna, and the coaxial line length (L place) that causes connecting external active antenna seriously influences being built-in with source antenna to the radio signal transmission process of mainboard.When the wire length of external active antenna interface is improper, may cause being built-in with the radiofrequency signal of source antenna can not normal transmission to mainboard, the operation of receiver instability.
Summary of the invention
Technical problem to be solved in the utility model is, provide and be equipped with the source antenna automatic switch-over circuit inside and outside a kind of, in the inside and outside radio-frequency (RF) switch that high-isolation is set in the source antenna automatic switch-over circuit that is equipped with, the radiofrequency signal that is equipped with source antenna inside and outside the realization is connected to the automatic switchover of mainboard, effectively solve external active antenna interface to being built-in with the interference of source antenna signal, improve external active antenna interface and be built-in with isolation between the source antenna interface.
In order to solve the problems of the technologies described above, the utility model provides and has been equipped with the source antenna automatic switch-over circuit inside and outside a kind of, comprises automatic switch-over circuit and radio-frequency (RF) switch; Described radio-frequency (RF) switch is provided with and is built-in with source antenna input port, external active antenna input port, signal output port, control port, grounding ports and power port; Described radio-frequency (RF) switch is electrically connected with described automatic switch-over circuit by external active antenna input port and signal output port.
As the improvement of such scheme, the signal output port of described radio-frequency (RF) switch is electrically connected with described automatic switch-over circuit by first electric capacity.
As the improvement of such scheme, described automatic switch-over circuit comprises the first positive-negative-positive triode, the second positive-negative-positive triode, the 3rd positive-negative-positive triode, NPN type triode, first inductance, second inductance, the 3rd inductance, the 4th inductance, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity; The base stage of the described first positive-negative-positive triode is connected with the collector electrode of NPN type triode by first resistance, the emitter of the emitter of the described first positive-negative-positive triode and the second positive-negative-positive triode, one end of the 3rd resistance, one end of the 4th resistance connects, the base stage of the base stage of described the 3rd positive-negative-positive triode and the second positive-negative-positive triode, one end of the 6th resistance connects, one end of the collector electrode of described the 3rd positive-negative-positive triode and second resistance, one end of the 5th resistance connects, the other end of the emitter of described the 3rd positive-negative-positive triode and the 3rd resistance, one end of first inductance, one end of second electric capacity connects, the collector electrode of described NPN type triode is connected with the other end of second resistance, one end of the other end of described first inductance and the 3rd electric capacity, one end of second inductance connects, the other end of described second inductance is connected with the external active antenna input port of radio-frequency (RF) switch by the 6th electric capacity, one end of the other end of described the 4th resistance and the 3rd inductance, one end of the 4th electric capacity connects, one end of the other end of described the 3rd inductance and the 4th inductance, one end of the 5th electric capacity connects, the other end of described the 4th inductance is connected described the 5th resistance by first electric capacity with the signal output port of radio-frequency (RF) switch, the 6th resistance, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the emitter of NPN type triode is ground connection respectively.
As the improvement of such scheme, described second inductance is provided with coaxial line to be connected external active antenna with the junction of the 6th electric capacity.
As the improvement of such scheme, the source antenna input port that is built-in with of described radio-frequency (RF) switch is electrically connected with the radio-frequency (RF) output end mouth that is built-in with source antenna by the 7th electric capacity; The external active antenna input port of described radio-frequency (RF) switch is electrically connected with the radio-frequency (RF) output end mouth of external active antenna by the 6th electric capacity, coaxial line; The signal output port of described radio-frequency (RF) switch is electrically connected with the rf inputs mouth of mainboard by first electric capacity.
As the improvement of such scheme, described radio-frequency (RF) switch is the single-pole double-throw radio frequency electronic switch.
The enforcement the beneficial effects of the utility model are:
When not connecting external active antenna, under the control of automatic switch-over circuit, mainboard provides the DC power supply of 3V for being built-in with source antenna, makes to be built-in with the source antenna operate as normal.When connecting external active antenna and connect, under the control of automatic switch-over circuit, mainboard provides the DC power supply of 0V for being built-in with source antenna, makes to be built-in with source antenna and to quit work, thereby realizes from being built-in with source antenna to the switching of external active antenna.
In the inside and outside radio-frequency (RF) switch that high-isolation is set in the source antenna automatic switch-over circuit that is equipped with, make the source antenna input port that is built-in with of radio-frequency (RF) switch connect the radio-frequency (RF) output end mouth that is built-in with source antenna, external active antenna input port connects the radio-frequency (RF) output end mouth of external active antenna by one section coaxial line, signal output port connects the rf inputs mouth of mainboard, control port connects the DC power supply of the low-noise amplification circuit that is built-in with source antenna, thereby improved external active antenna interface and be built-in with isolation between the source antenna interface, can effectively solve external active antenna interface to being built-in with the interference of source antenna signal, the length that connects the coaxial line of external active antenna no longer obviously influences the transmission that is built-in with the source antenna radiofrequency signal.
Description of drawings
Fig. 1 is equipped with the source antenna automatic switch-over circuit inside and outside existing;
Fig. 2 is the structural representation that the utility model is equipped with radio-frequency (RF) switch in the source antenna automatic switch-over circuit inside and outside a kind of;
Fig. 3 is the circuit diagram that the utility model is equipped with the source antenna automatic switch-over circuit inside and outside a kind of.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail.
As shown in Figure 3, be equipped with the source antenna automatic switch-over circuit inside and outside and comprise automatic switch-over circuit and radio-frequency (RF) switch M.
As Fig. 2, shown in Figure 3, described radio-frequency (RF) switch M is provided with and is built-in with source antenna input port 9, external active antenna input port 12, signal output port 3, control port 2, grounding ports and power port 1.Wherein, be built-in with source antenna input port 9 and connect the radio-frequency (RF) output end mouth that is built-in with source antenna, external active antenna input port 12 connects the radio-frequency (RF) output end mouth of external active antenna, signal output port 3 connects the rf inputs mouth of mainboard, control end 2 connects the DC power supply of the low-noise amplification circuit that is built-in with source antenna, simultaneously, described radio-frequency (RF) switch M is electrically connected with described automatic switch-over circuit by external active antenna input port 12 and signal output port 3.
Need to prove that the high-low level of control port 2 is respectively 3V and 0V.
When external active antenna input port 12 does not connect external active antenna, under the control of automatic switch-over circuit, mainboard provides the DC power supply of 3V for being built-in with source antenna, DC power supply is entered by control port 2, control port 2 is in high level, the source antenna input port 9 that is built-in with of radio-frequency (RF) switch M is connected with signal output port 3, and the signal that is built-in with source antenna transfers to mainboard, is built-in with the source antenna operate as normal.
When the external active antenna of external active antenna input port 12 connections connects, under the control of automatic switch-over circuit, mainboard provides the DC power supply of 0V for being built-in with source antenna, DC power supply is entered by control port 2, control port 2 is in low level, and the external active antenna input port 12 of radio-frequency (RF) switch M and signal output port 3 are connected, and the signal of external active antenna transfers to mainboard, be built-in with source antenna and quit work, thereby realize from being built-in with source antenna to the switching of external active antenna.
More preferably, the signal output port 3 of described radio-frequency (RF) switch is electrically connected with described automatic switch-over circuit by first capacitor C 1.
As shown in Figure 2, described automatic switch-over circuit comprises the first positive-negative-positive triode Q1, the second positive-negative-positive triode Q2, the 3rd positive-negative-positive triode Q3, NPN type triode Q4, first inductance L 1, second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5 and the 6th capacitor C 6.
The base stage of the described first positive-negative-positive triode Q1 is connected with the collector electrode of NPN type triode Q4 by first resistance R 1, and the emitter of the described first positive-negative-positive triode Q1 is connected with the emitter of the second positive-negative-positive triode Q2, an end of the 3rd resistance R 3, an end of the 4th resistance R 4.
The base stage of described the 3rd positive-negative-positive triode Q3 is connected with the base stage of the second positive-negative-positive triode Q2, an end of the 6th resistance R 6, the collector electrode of described the 3rd positive-negative-positive triode Q3 is connected with an end of second resistance R 2, an end of the 5th resistance R 5, and the emitter of described the 3rd positive-negative-positive triode Q3 is connected with an end of the other end of the 3rd resistance R 3, first inductance L 1, an end of second capacitor C 2.
The collector electrode of described NPN type triode Q4 is connected with the other end of second resistance R 2.
The other end of described first inductance L 1 is connected with an end of the 3rd capacitor C 3, an end of second inductance L 2, and the other end of described second inductance L 2 is connected with the external active antenna input port 12 of radio-frequency (RF) switch by the 6th capacitor C 6.
The other end of described the 4th resistance R 4 is connected with an end of the 3rd inductance L 3, an end of the 4th capacitor C 4, the other end of described the 3rd inductance L 3 is connected with an end of the 4th inductance L 4, an end of the 5th capacitor C 5, and the other end of described the 4th inductance L 4 is connected with the signal output port 3 of radio-frequency (RF) switch by first capacitor C 1.
The emitter of described the 5th resistance R 5, the 6th resistance R 6, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, NPN type triode Q4 is ground connection respectively.
Need to prove, when external active antenna input port 12 does not connect external active antenna, the first positive-negative-positive triode Q1 conducting, mainboard provides the DC power supply of 3V for being built-in with source antenna, DC power supply is entered by control port 2, and control port 2 is in high level, and the source antenna input port 9 that is built-in with of radio-frequency (RF) switch M is connected with signal output port 3, the signal that is built-in with source antenna transfers to mainboard, is built-in with the source antenna operate as normal; When the external active antenna of external active antenna input port 12 connections connects, the electric current of mainboard output flows through the 3rd resistance R 3, the electromotive force that causes A to be ordered reduces, voltage reduces, the emitter voltage of the 3rd positive-negative-positive triode Q3 is less than cut-in voltage, the collector electrode reverse bias, so the 3rd positive-negative-positive triode Q3 ends, there is not electric current to flow through NPN type triode Q4, then NPN type triode Q4, the first positive-negative-positive triode Q1 ends, this moment, control port 2 places were 0V voltage, low level can not be powered for being built-in with source antenna, is built-in with source antenna and quits work, at this moment, the external active antenna input port 12 of radio-frequency (RF) switch M is connected with signal output port 3, and the signal of external active antenna transfers to mainboard, thereby realizes from being built-in with source antenna to the switching of external active antenna.
More preferably, described second inductance L 2 is provided with coaxial line to be connected external active antenna with the junction of the 6th capacitor C 6.
More preferably, the source antenna input port 9 that is built-in with of described radio-frequency (RF) switch M is electrically connected with the radio-frequency (RF) output end mouth that is built-in with source antenna by the 7th capacitor C 7, the external active antenna input port of described radio-frequency (RF) switch is electrically connected with the radio-frequency (RF) output end mouth of external active antenna by the 6th electric capacity, coaxial line, and the signal output port of described radio-frequency (RF) switch is electrically connected with the rf inputs mouth of mainboard by first electric capacity
More preferably, described radio-frequency (RF) switch M is the single-pole double-throw radio frequency electronic switch.Preferably, described single-pole double-throw radio frequency electronic switch is by the manufacturing of Mini-Circuits company, and model is VSWA2-63DR+.
Need to prove, radio-frequency (RF) switch M can effectively solve the interference that the coaxial pair that connects external active antenna input port 12 is built-in with the source antenna signal, improve external active antenna input port 12 and be built-in with isolation between the source antenna input port 9, be equipped with the radiofrequency signal of source antenna and being connected of mainboard inside and outside the control, the length L of coaxial line no longer obviously influenced be built-in with source antenna to the radio signal transmission of mainboard.
Need to prove that described automatic switch-over circuit M is electrically connected with the DC power supply N of low-noise amplification circuit by the collector electrode of the first positive-negative-positive triode Q1.
When external active antenna input port 12 does not connect external active antenna, the first positive-negative-positive triode Q1 conducting, the power supply that mainboard provides exports the DC power supply N of low-noise amplification circuit to by the collector electrode of the first positive-negative-positive triode Q1, and the 3V DC power supply after the DC power supply N of low-noise amplification circuit handles enters radio-frequency (RF) switch M by control port 2; When the external active antenna of external active antenna input port 12 connections connect, the first positive-negative-positive triode Q1 ended, and the power supply that mainboard provides can't export the DC power supply N of low-noise amplification circuit to, and making control port 2 places is 0V voltage.
Be described in further detail below in conjunction with the utility model of embodiment.
Comparative Examples 1: be under the situation of 1238 MHz in frequency, adopt and shown in Figure 1 be equipped with the source antenna automatic switch-over circuit inside and outside existing, make the coaxial line length L that connects external active antenna be respectively 0 mm, 5.3 mm, 6.3 mm, measure the gain (dB) that is built-in with source antenna.
Embodiment 1: be under the situation of 1238 MHz in frequency, increase radio-frequency (RF) switch, adopt to be equipped with the source antenna automatic switch-over circuit inside and outside shown in Figure 3, make the coaxial line length L that connects external active antenna be respectively 0 mm, 5.3 mm, 6.3 mm, measure the gain (dB) that is built-in with source antenna.
Comparative Examples 2: be under the situation of 1590 MHz in frequency, adopt and shown in Figure 1 be equipped with the source antenna automatic switch-over circuit inside and outside existing, make the coaxial line length L that connects external active antenna be respectively 0 mm, 5.3 mm, 6.3 mm, measure the gain (dB) that is built-in with source antenna.
Embodiment 2: be under the situation of 1590 MHz in frequency, increase radio-frequency (RF) switch, adopt to be equipped with the source antenna automatic switch-over circuit inside and outside shown in Figure 3, make the coaxial line length L that connects external active antenna be respectively 0 mm, 5.3 mm, 6.3 mm, measure the gain (dB) that is built-in with source antenna.
The gain data that is built-in with source antenna among Comparative Examples 1, embodiment 1, Comparative Examples 2 and the embodiment 2 is as shown in table 1.
As seen from Table 1, be equipped with the source antenna automatic switch-over circuit if use inside and outside existing, the coaxial line length L that connects external active antenna has a significant effect to the gain that is built-in with the source antenna radiofrequency signal, can cause the operation of receiver instability; If increase radio-frequency (RF) switch inside and outside being equipped with in the source antenna automatic switch-over circuit, when being built-in with source antenna work, the length that connects the coaxial line of external active antenna interface no longer obviously influences the transmission that is built-in with the source antenna radiofrequency signal, the coaxial line length L that connects external active antenna can be ignored to the influence of the radiofrequency signal overall gain that is built-in with source antenna, and operation of receiver is stable.
As from the foregoing, when external active antenna input port 12 does not connect external active antenna, under the control of automatic switch-over circuit, mainboard provides the DC power supply of 3V for being built-in with source antenna, DC power supply is entered by control port 2, and control port 2 is in high level, and the source antenna input port 9 that is built-in with of radio-frequency (RF) switch M is connected with signal output port 3, the signal that is built-in with source antenna transfers to mainboard, is built-in with the source antenna operate as normal; When the external active antenna of external active antenna input port 12 connections connects, under the control of automatic switch-over circuit, mainboard provides the DC power supply of 0V for being built-in with source antenna, DC power supply is entered by control port 2, control port 2 is in low level, and the external active antenna input port 12 of radio-frequency (RF) switch M and signal output port 3 are connected, and the signal of external active antenna transfers to mainboard, be built-in with source antenna and quit work, thereby realize from being built-in with source antenna to the switching of external active antenna.Can effectively solve the coaxial line length L of the external active antenna of connection to being built-in with the interference of source antenna signal, improve external active antenna interface and be built-in with isolation between the source antenna interface, guarantee to connect the coaxial line length L of external active antenna to being built-in with source antenna to the not influence of radio signal transmission of mainboard.
The above is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.
Claims (6)
1. be equipped with the source antenna automatic switch-over circuit inside and outside one kind, it is characterized in that, comprise automatic switch-over circuit and radio-frequency (RF) switch;
Described radio-frequency (RF) switch is provided with and is built-in with source antenna input port, external active antenna input port, signal output port, control port, grounding ports and power port;
Described radio-frequency (RF) switch is electrically connected with described automatic switch-over circuit by external active antenna input port and signal output port.
2. be equipped with the source antenna automatic switch-over circuit inside and outside as claimed in claim 1, it is characterized in that, the signal output port of described radio-frequency (RF) switch is electrically connected with described automatic switch-over circuit by first electric capacity.
3. be equipped with the source antenna automatic switch-over circuit inside and outside as claimed in claim 2, it is characterized in that described automatic switch-over circuit comprises the first positive-negative-positive triode, the second positive-negative-positive triode, the 3rd positive-negative-positive triode, NPN type triode, first inductance, second inductance, the 3rd inductance, the 4th inductance, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity;
The base stage of the described first positive-negative-positive triode is connected with the collector electrode of NPN type triode by first resistance, the emitter of the emitter of the described first positive-negative-positive triode and the second positive-negative-positive triode, one end of the 3rd resistance, one end of the 4th resistance connects, the base stage of the base stage of described the 3rd positive-negative-positive triode and the second positive-negative-positive triode, one end of the 6th resistance connects, one end of the collector electrode of described the 3rd positive-negative-positive triode and second resistance, one end of the 5th resistance connects, the other end of the emitter of described the 3rd positive-negative-positive triode and the 3rd resistance, one end of first inductance, one end of second electric capacity connects, the collector electrode of described NPN type triode is connected with the other end of second resistance, one end of the other end of described first inductance and the 3rd electric capacity, one end of second inductance connects, the other end of described second inductance is connected with the external active antenna input port of radio-frequency (RF) switch by the 6th electric capacity, one end of the other end of described the 4th resistance and the 3rd inductance, one end of the 4th electric capacity connects, one end of the other end of described the 3rd inductance and the 4th inductance, one end of the 5th electric capacity connects, the other end of described the 4th inductance is connected described the 5th resistance by first electric capacity with the signal output port of radio-frequency (RF) switch, the 6th resistance, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the emitter of NPN type triode is ground connection respectively.
4. be equipped with the source antenna automatic switch-over circuit inside and outside as claimed in claim 3, it is characterized in that described second inductance is provided with coaxial line to be connected external active antenna with the junction of the 6th electric capacity.
5. be equipped with the source antenna automatic switch-over circuit inside and outside as claimed in claim 4, it is characterized in that the source antenna input port that is built-in with of described radio-frequency (RF) switch is electrically connected with the radio-frequency (RF) output end mouth that is built-in with source antenna by the 7th electric capacity;
The external active antenna input port of described radio-frequency (RF) switch is electrically connected with the radio-frequency (RF) output end mouth of external active antenna by the 6th electric capacity, coaxial line;
The signal output port of described radio-frequency (RF) switch is electrically connected with the rf inputs mouth of mainboard by first electric capacity.
6. be equipped with the source antenna automatic switch-over circuit inside and outside as claimed in claim 1, it is characterized in that described radio-frequency (RF) switch is the single-pole double-throw radio frequency electronic switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320096414XU CN203135864U (en) | 2013-03-04 | 2013-03-04 | Automatic switching circuit of internal antenna and external antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320096414XU CN203135864U (en) | 2013-03-04 | 2013-03-04 | Automatic switching circuit of internal antenna and external antenna |
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| Publication Number | Publication Date |
|---|---|
| CN203135864U true CN203135864U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320096414XU Expired - Lifetime CN203135864U (en) | 2013-03-04 | 2013-03-04 | Automatic switching circuit of internal antenna and external antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759137A (en) * | 2014-12-19 | 2016-07-13 | 神讯电脑(昆山)有限公司 | Coaxial pass-through testing method for machine |
| CN115001622A (en) * | 2022-08-03 | 2022-09-02 | 南京尤尼泰信息科技有限公司 | Radio frequency isolation system and isolation method |
-
2013
- 2013-03-04 CN CN201320096414XU patent/CN203135864U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759137A (en) * | 2014-12-19 | 2016-07-13 | 神讯电脑(昆山)有限公司 | Coaxial pass-through testing method for machine |
| CN105759137B (en) * | 2014-12-19 | 2018-09-18 | 神讯电脑(昆山)有限公司 | The coaxial via test method of board |
| CN115001622A (en) * | 2022-08-03 | 2022-09-02 | 南京尤尼泰信息科技有限公司 | Radio frequency isolation system and isolation method |
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