CN213186119U - 27.095MHz calibration device for transponder test antenna - Google Patents
27.095MHz calibration device for transponder test antenna Download PDFInfo
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- CN213186119U CN213186119U CN202021226986.1U CN202021226986U CN213186119U CN 213186119 U CN213186119 U CN 213186119U CN 202021226986 U CN202021226986 U CN 202021226986U CN 213186119 U CN213186119 U CN 213186119U
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Abstract
The utility model relates to an 27.095MHz calibrating device for transponder test antenna, including the signal generation subassembly, signal reception subassembly and power detection subassembly, the output connection signal input interface of signal generation subassembly, the signal reception subassembly includes balanced-unbalanced transformer and 27.095MHz signal reference ring, 27.095MHz signal reference ring and 27.095MHz signal transmission antenna inductive coupling, the signal output part of 27.095MHz signal reference ring is connected with balanced-unbalanced transformer's input, balanced-unbalanced transformer's output and first power acquisition interface are connected with the power detection subassembly respectively. Compared with the prior art, the utility model discloses simple structure, low cost, occupation space is little, and the less consumption of accessible and simple circuit design satisfy 27.095MHz signalling's of test antenna detection, calibration demand.
Description
Technical Field
The utility model belongs to the technical field of transponder detection and specifically relates to an 27.095MHz calibrating device for transponder test antenna is related to.
Background
The transponder is used for realizing high-speed point type data transmission between the ground and vehicle-mounted equipment at a specific place by utilizing the electromagnetic induction principle. The transponder is arranged at the center of the two steel rails, is in a dormant state at ordinary times, works only by instantly receiving the power of the vehicle-mounted antenna, and can send message information to the vehicle-mounted antenna while receiving 27.095MHz signals sent by the vehicle-mounted antenna. An on-board antenna CAU mounted at the bottom of the locomotive continuously transmits power to the ground and receives coded information from the ground transponder as the locomotive passes by the transponder. When a train passes above the transponder, the transponder receives electromagnetic energy transmitted by the vehicle-mounted antenna (27.095 MHz sine wave signals are input), converts the electromagnetic energy into electric energy, enables an electronic circuit in the transponder to work, and sends 1023 bit data messages stored in the transponder out in a circulating mode (4.23 MHz message signals are output) until the electric energy disappears (namely the vehicle-mounted antenna leaves).
When the transponder is in a factory detection room, a test antenna is required to be used for detecting the 27.095MHz signal receiving function and the 4.23MHz signal output function of the transponder. If the 27.095MHz signal transmission function of the test antenna is inaccurate, the test result deviation during the test of the transponder is overlarge, and the current calibration device for the 27.095MHz signal transmission function of the test antenna has a complex structure, high circuit design and device cost and poor use convenience.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to provide an 27.095MHz calibration device for a transponder test antenna, which has a simple structure and low cost, so as to overcome the drawbacks of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides an 27.095MHz calibrating device for transponder test antenna, the test antenna include 27.095MHz signal transmission antenna, 27.095MHz signal transmission antenna on be equipped with signal input interface and first power acquisition interface, calibrating device include signal generation subassembly, signal reception subassembly and power detection subassembly, the output of signal generation subassembly connect signal input interface, the signal reception subassembly include balun and 27.095MHz signal reference ring, 27.095MHz signal reference ring and 27.095MHz signal transmission antenna inductive coupling, the signal output part of 27.095MHz signal reference ring be connected with balun's input, balun's output and first power acquisition interface be connected with power detection subassembly respectively.
Preferably, the signal generating assembly includes a signal generator, a first attenuator, a radio frequency power amplifier and a second attenuator, an output end of the signal generator is connected to an input end of the first attenuator, an output end of the first attenuator is connected to an input end of the radio frequency power amplifier, an output end of the radio frequency power amplifier is connected to an input end of the second attenuator, and an output end of the second attenuator is connected to the signal input interface.
Preferably, the first attenuator is a TS5-6dB attenuator, and the second attenuator is a WDTS-100-3-2.5-C attenuator.
Preferably, the test antenna further comprises a 4.23MHz signal receiving antenna, the 4.23MHz signal receiving antenna is provided with a second power acquisition interface, the calibration device further comprises a simulation resistor, and the simulation resistor is connected with the second power acquisition interface.
Preferably, the power detection assembly includes a first power meter and a second power meter, the first power meter is connected to the first power collecting interface, and the second power meter is connected to the output end of the balun.
Preferably, the power detection assembly further includes a third attenuator, and the third attenuator is connected in series between the second power meter and the balun.
Preferably, the third attenuator is a 20DB-10W attenuator.
Preferably, the signal generator is a Tektronix AWG 5202 signal generator.
Preferably, the radio frequency power amplifier is an AR100a400A power amplifier.
Preferably, the first power meter and the second power meter are both NRX radio frequency power meters.
Compared with the prior art, the utility model has the advantages of as follows:
(1) the utility model combines the signal generating component, the signal receiving component and the power detecting component, and can detect and correspondingly calibrate the 27.095MHz signal transmitting antenna of the testing antenna, thereby improving the reliability of the testing antenna;
(2) the utility model has simple structure, low cost and small occupied space, can meet the detection and calibration requirements of the test antenna through less consumption and simple circuit design, ensure the accuracy of the test antenna for detecting the transponder, and further improve the quality of the transponder when leaving the factory;
(3) the utility model discloses utilize 27.095MHz signal reference ring as the standard component, detect 27.095MHz signal emission antenna to the test antenna, improve the accuracy that detects.
Drawings
Fig. 1 is a schematic structural view of the present invention;
the device comprises a signal generator 1, a signal generator 2, a first attenuator 3, a radio frequency power amplifier 4, a second attenuator 5, a signal input interface 6, a first power acquisition interface 7, a second power acquisition interface, a 8, 27.095MHz signal reference ring 9, a balun 9, a third attenuator 10, a first power meter 11, a 12, a second power meter 13, an antenna support 14, a 27.095MHz signal transmitting antenna, a 15, 4.23MHz signal receiving antenna, and an analog resistor 16.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the following description of the embodiments is merely an example of the nature, and the present invention is not intended to limit the application or the use thereof, and the present invention is not limited to the following embodiments.
Examples
An 27.095MHz calibrating device for a transponder test antenna is used for calibrating 27.095MHz signal output of the test antenna, and the test antenna is used for debugging input signals of the transponder.
Specifically, the test antenna comprises an 27.095MHz signal transmitting antenna 14 and a 4.23MHz signal receiving antenna 15, a signal input interface 5 and a first power acquisition interface 6 are arranged on the 27.095MHz signal transmitting antenna 14, and a second power acquisition interface 7 is arranged on the 4.23MHz signal receiving antenna 15. The test antenna further comprises an antenna support 13, and the 4.23MHz signal receiving antenna 17 and the 27.095MHz signal receiving antenna 16 are erected on the antenna support 13.
The calibration device comprises a signal generating component, a signal receiving component and a power detection component.
Specifically, the output end of the signal generating assembly is connected with the signal input interface 5, the signal receiving assembly comprises a balun 9 and an 27.095MHz signal reference ring 8, the 27.095MHz signal reference ring 8 is inductively coupled with the 27.095MHz signal transmitting antenna 14, the signal output end of the 27.095MHz signal reference ring 8 is connected with the input end of the balun 9, and the output end of the balun 9 and the first power acquisition interface 6 are respectively connected with the power detection assembly.
Further, the signal generating assembly comprises a signal generator 1, a first attenuator 2, a radio frequency power amplifier 3 and a second attenuator 4, wherein an output end of the signal generator 1 is connected with an input end of the first attenuator 2, an output end of the first attenuator 2 is connected with an input end of the radio frequency power amplifier 3, an output end of the radio frequency power amplifier 3 is connected with an input end of the second attenuator 4, and an output end of the second attenuator 4 is connected with a signal input interface 5.
Further, the power detection assembly comprises a first power meter 11 and a second power meter 12, the first power meter 11 is connected with the first power collecting interface 6, and the second power meter 12 is connected with the output end of the balun 9.
In order to improve the stability of power detection, the power detection assembly further includes a third attenuator 10, and the third attenuator 10 is connected in series between the second power meter 12 and the balun 9.
In order to simulate the use state and use environment of the test antenna, the calibration device further comprises a simulation resistor 16, and the simulation resistor 16 is connected with the second power acquisition interface 7.
Preferably, in this embodiment, in order to improve the accuracy and stability of the debugging device, the first attenuator 2 is a TS5-6dB attenuator, the second attenuator 4 is a WDTS-100-3-2.5-C attenuator, the third attenuator 10 is a 20dB-10W attenuator, the signal generator 1 is a Tektronix AWG 5202 signal generator, the radio-frequency power amplifier 3 is an AR100a400A power amplifier, and both the first power meter 11 and the second power meter 12 are NRX radio-frequency power meters.
The calibration procedure will give a P for each test position specified in the standard27RLThe reference value is compared with the transponder test result P27BA of the corresponding position. Reference value P27RLProportional to the square of the transmit loop current, which can cause the magnetic flux through the reference region to be Φdl. The transmit loop current is measured by the first power meter 11(PM2) and compensated as P27RL。
The calibration environment is built and calibrated as follows:
a) the test antenna was placed at a position relative to the 27.095MHz signal reference ring 8[ X0, Y0, Z220 ], the electrical center of the test antenna aligned with the electrical center of the 27.095MHz signal reference ring 8, and the alignment of the X, Y, Z axis of the 27.095MHz signal reference ring 8 with the X, Y, Z axis of the positioning system was checked.
b) When the magnetic flux passing through the 27.095MHz signal reference ring 8 is "Φdl"while the corresponding power P on the 27.095MHz signal reference ring 8 is calculated according to equation 1LA value; measuring the attenuation value and calculating P according to equation 2M3(in dBm) and is denoted PM3REF。
Specifically, equation 1:
in the formula:
the frequency of f is 27.095 MHz;
Zloopthe actual impedance of the reference loop 8 for the 27.095MHz signal without the antenna;
PLthe reference loop 8 output power is measured for the 27.095MHz signal in watts (W);
b is the matching transmission ratio of the 27.095MHz signal reference loop 8.
Equation 2:
PM3＝10*log(PL1000) -attenuation value
In the formula:
the attenuation value [ dBm ] is generally a 20dB attenuator.
c) The signal generator 1 is arranged to generate continuous waves with the frequency of 27.095 MHz;
d) the test antenna input power is adjusted so that the magnetic flux through the 27.095MHz signal reference ring 8 is ΦdlRecording the reading of the second power meter 12 as PM3；
e) Recording the first power meter 11 reading as PM2；
f) Compensating the reading of PM2 according to formula 3 by the difference between the reading of PM3 and the reading of PM3REF calculated in step b), and recording the new value as P27RL (unit of dBm);
equation 3:
P27RL＝PM2+(PM3REF-PM3) In dBm.
g) Repeating steps d), e) and f) according to all positions specified in the standard, wherein the position of the excitation antenna relative to the transponder is fixed;
note: calculation in step b), assuming ZloopRelatively small at 50 Ω, phid 1 ═ 7.7nVs, with a delta attenuation equal to 20dB, PM3 equals-4.6 dBm for a large 27.095MHz signal reference loop 8. And for a standard size 27.095MHz signal reference ring 8, phidlPM3 at 4.9nVs equals-8.6 dBm. The reason for the compensation in step f) is that the higher relative accuracy of P27RL between the different positions is required, and this process compensates for the errors introduced when adjusting the signal generator.
The utility model discloses during the use, the signal generation subassembly is to the 27.095MHz signal transmission antenna 14 input 27.095MHz signal of test antenna, and 27.095MHz signal transmission antenna 14 sends 27.095MHz signal and is received by 27.095MHz signal reference ring 8, and first dynamometer detects 27.095MHz signal transmission antenna 14's power, and second dynamometer 12 detects 27.095MHz signal reference ring 8's power.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. The utility model provides an 27.095MHz calibrating device for transponder test antenna, characterized in that, test antenna include 27.095MHz signalling antenna (14), 27.095MHz signalling antenna (14) on be equipped with signal input interface (5) and first power acquisition interface (6), calibrating device include signal generation subassembly, signal reception subassembly and power detection subassembly, the output of signal generation subassembly connect signal input interface (5), the signal reception subassembly include balanced-unbalanced transformer (9) and 27.095MHz signal reference ring (8), 27.095MHz signal reference ring (8) and 27.095MHz signalling antenna (14) inductive coupling, the signal output part of 27.095MHz signal reference ring (8) be connected with the input of balanced-unbalanced transformer (9), the output of balanced-unbalanced transformer (9) and first power acquisition interface (6) examine power respectively and examine power and examine And connecting the measuring components.
2. An 27.095MHz calibration device for a transponder test antenna according to claim 1, wherein the signal generating assembly comprises a signal generator (1), a first attenuator (2), a radio frequency power amplifier (3) and a second attenuator (4), an output of the signal generator (1) is connected to an input of the first attenuator (2), an output of the first attenuator (2) is connected to an input of the radio frequency power amplifier (3), an output of the radio frequency power amplifier (3) is connected to an input of the second attenuator (4), and an output of the second attenuator (4) is connected to the signal input interface (5).
3. An 27.095MHz calibration device for a transponder test antenna as claimed in claim 2, wherein said first attenuator (2) is a TS5-6dB attenuator and said second attenuator (4) is a WDTS-100-3-2.5-C attenuator.
4. The 27.095MHz calibration device for transponder test antenna of claim 1, wherein the test antenna further comprises a 4.23MHz signal receiving antenna (15), the 4.23MHz signal receiving antenna (15) is provided with a second power harvesting interface (7), the calibration device further comprises an analog resistor (16), and the analog resistor (16) is connected with the second power harvesting interface (7).
5. An 27.095MHz calibration device for a transponder test antenna according to claim 1, wherein the power detection assembly comprises a first power meter (11) and a second power meter (12), the first power meter (11) being connected to the first power harvesting interface (6), the second power meter (12) being connected to the output of the balun (9).
6. The 27.095MHz calibration device for a transponder test antenna of claim 5, wherein the power detection assembly further comprises a third attenuator (10), the third attenuator (10) being disposed in series between the second power meter (12) and the balun (9).
7. An 27.095MHz calibration device for a transponder test antenna according to claim 6, wherein said third attenuator (10) is a 20DB-10W attenuator.
8. An 27.095MHz calibration device for a transponder test antenna according to claim 2, wherein said signal generator (1) is a Tektronix AWG 5202 signal generator.
9. An 27.095MHz calibration device for a transponder test antenna as claimed in claim 2, wherein said radio frequency power amplifier (3) is an AR100A400A power amplifier.
10. An 27.095MHz calibration device for a transponder test antenna according to claim 5, wherein the first power meter (11) and the second power meter (12) are NRX radio frequency power meters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226986.1U CN213186119U (en) | 2020-06-29 | 2020-06-29 | 27.095MHz calibration device for transponder test antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021226986.1U CN213186119U (en) | 2020-06-29 | 2020-06-29 | 27.095MHz calibration device for transponder test antenna |
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| CN213186119U true CN213186119U (en) | 2021-05-11 |
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