CN110677202A - Array antenna intermodulation and active impedance test system - Google Patents
Array antenna intermodulation and active impedance test system Download PDFInfo
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- CN110677202A CN110677202A CN201910997170.4A CN201910997170A CN110677202A CN 110677202 A CN110677202 A CN 110677202A CN 201910997170 A CN201910997170 A CN 201910997170A CN 110677202 A CN110677202 A CN 110677202A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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Abstract
The invention discloses an array antenna intermodulation and active impedance test system, wherein the output end of a transmitting device is connected with the inlet and outlet of a combining unit, the output port of the combining unit is connected with the transmitting TX port of a duplexer module, the ANT port of the duplexer module is connected with a first channel of a 64-channel radio frequency switch, a second channel of the 64-channel radio frequency switch is connected with the input end of the active impedance test system, a COM channel of the 64-channel radio frequency switch is connected with a tested port of a multi-port antenna array, a radio frequency signal of the duplexer module is transmitted to the tested port of the multi-port antenna array through the COM port of the 64-channel radio frequency switch, and phase shift amplitude modulation parameter signals of each port of the multi-port antenna array are switched to the active impedance test system through the second channel of the 64-channel radio. The invention can realize multifunctional test, and integrates intermodulation test and active impedance test.
Description
Technical Field
The invention relates to the field of testing of intermodulation products and active impedance of passive devices, in particular to an array antenna intermodulation and active impedance testing system.
Background
Active impedance parameters of real-time antennas for phased array beam scanning work are key indexes of phased array antennas, and are directly related to the coverage area of phased array beams, the gain and the safety of T/R equipment. The beam scanning is realized by adjusting the phase on each antenna unit, and the change of the phase directly affects the mutual coupling between the antenna units, so as to change the impedance characteristic parameters of the antenna units, thereby possibly forming signal reflection at the ports of the antenna units, being incapable of realizing the beam and gain required by design, and burning the power amplifier unit under extreme conditions. Therefore, when the phased array antenna is in scanning operation, the port impedance parameter of each antenna unit, namely the active impedance parameter, is a key index for describing the characteristics of the phased array. While precise testing of active impedance parameters requires simultaneous testing of a group of cells at a given amplitude and phase, conventional test systems cannot provide simultaneous testing of port parameters of multiple channels, thereby disturbing effective design and performance assurance of phased arrays.
Therefore, it is urgently needed to design a passive intermodulation tester which can measure the intermodulation index of the passive device and can also measure the phase shift amplitude modulation index of the passive device.
Disclosure of Invention
The invention aims to provide an array antenna intermodulation and active impedance test system to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an array antenna intermodulation and active impedance test system comprises a transmitting device, a receiving device, a combiner unit, a duplexer module, a 64-channel radio frequency switch, a multi-port antenna array and an active impedance test system; the output end of the transmitting device is connected with the inlet and the outlet of the combining unit, the output port of the combining unit is connected with the transmitting TX port of the duplexer module, the ANT port of the duplexer module is connected with the I-path channel of the 64-path radio frequency switch, the II-path channel of the 64-path radio frequency switch is connected with the input end of the active impedance test system, the COM channel of the 64-path radio frequency switch is connected with the tested port of the multi-port antenna array, the radio frequency signal of the duplexer module is transmitted to the tested port of the multi-port antenna array through the COM port of the 64-path radio frequency switch, and the phase shift amplitude modulation parameter signal of each port of the multi-port antenna array is switched to the active impedance test system through the II-.
Furthermore, the transmitting device includes a first signal source, a second signal source, a first power amplifier, a second power amplifier, a combiner, and a combiner module, where the first signal source is connected to the first power amplifier, the second signal source is connected to the second power amplifier, an output end of the first power amplifier is connected to a first input end of the combiner, an output end of the second power amplifier is connected to a second input end of the combiner, an input end of the combiner is connected to an input port of the combiner module, an output port of the combiner module is connected to a TX reflection port of the duplexer module, the combiner is configured to perform power combining on the two received signals, and the combined power signal transmits the power signal to a TX port of the duplexer module through the combiner module.
Furthermore, the receiving device includes a radio frequency switch unit, a receiving filter and a digital receiver module, an output end of the radio frequency switch unit is connected to an RX channel of the duplexer module, a COM port of the radio frequency switch unit is connected to an input end of the receiving filter, and an output end of the receiving filter is connected to an input end of the digital receiver module.
Further, the active impedance testing system comprises a phase matrix, a switch matrix and a vector network analyzer, wherein the phase matrix is connected with a circulator through a first coupling unit, the circulator is connected with II channels of 64 radio frequency switches, a coupling port of the first coupling unit is connected with an input port of the switch matrix, a 3 rd port of the circulator is connected with a second coupling unit, a coupling port of the second coupling unit is connected with an input port of the switch matrix, and a COM port of the switch matrix is connected with a second port of the vector network analyzer.
Compared with the prior art, the invention has the advantages that: the invention can measure the intermodulation index of the passive device and the active impedance parameter index, and integrates the intermodulation test and the phase shift amplitude modulation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an array antenna intermodulation and active impedance test system of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Referring to fig. 1, the present invention provides an array antenna intermodulation and active impedance test system, which includes a transmitter, a receiver, a combiner unit, a duplexer module 500, a 64-channel rf switch 801, a multi-port antenna array, and an active impedance test system; the output end of the transmitting device is connected with the inlet and outlet of the combining unit, the output port of the combining unit is connected with the transmitting TX port of the duplexer module 500, the ANT port of the duplexer module 500 is connected with the I-channel (occupying 32 channels altogether) of the 64-channel radio frequency switch 801, the II-channel of the 64-channel radio frequency switch 801 is connected with the input end of the active impedance test system, the COM channel of the 64-channel radio frequency switch 801 is connected with the tested port of the multi-port antenna array, the radio frequency signal of the duplexer module 500 is transmitted to the tested port of the multi-port antenna array through the COM port of the 64-channel radio frequency switch 801, and the phase-shift amplitude modulation parameter signal of each port of the multi-port antenna array is switched to the active impedance test system through the II-channel.
In this embodiment, the intermodulation signal generated by the multi-port antenna array is transmitted to the RX port of the duplexer module 500 (total 32 duplexers) through the i channel of the 64 rf switches 801.
In this embodiment, the transmitting device includes a first signal source 101, a second signal source 102, a first power amplifier 201, a second power amplifier 202, a combiner 301, and a combining module 302, where the first signal source 101 is connected to the first power amplifier 201, the second signal source 102 is connected to the second power amplifier 202, an output end of the first power amplifier 201 is connected to a first input end of the combiner 301, an output end of the second power amplifier 202 is connected to a second input end of the combiner 301, an output end of the combiner 301 is connected to an input port of the combining module 302, an output port of the combining module 302 is connected to a TX reflective port of the duplexer module 500, the combiner 301 is configured to perform power combining on the two received signals, and the combined power signal transmits the power signal to a TX port of the duplexer module 500 through the combining module 302.
In this embodiment, the receiving apparatus includes a radio frequency switch unit, a receiving filter, and a digital receiver module 401, an output end of the radio frequency switch unit is connected to an RX channel of the duplexer module 500, a COM port of the radio frequency switch unit is connected to an input end of the receiving filter, and an output end of the receiving filter is connected to an input end of the digital receiver module 401.
In this embodiment, the rf switch unit includes an rf switch 401, an rf switch 402, an rf switch 403, and an rf switch 404, the RX ports of 8 duplexers in the duplexer module 500 are respectively connected to eight channels of the rf switch 402, the RX ports of 8 duplexers are respectively connected to eight channels of the rf switch 403, the RX ports of 8 duplexers are respectively connected to eight channels of the rf switch 404, the RX ports of 8 duplexers are respectively connected to eight channels of the rf switch 405, the rf switch 401 is connected to the rf switch 402, the rf switch 403, the rf switch 404, and the rf switch 405, the common port of the rf switch 401 is connected to the input port of the receiving filter 1101, the output port of the input port of the receiving filter 1101 is connected to the input port of the digital receiver module 1201, and the digital receiver module 1201 converts the received intermodulation rf signal into a digital signal and transmits the digital signal to the upper computer software for reading.
Because the port to be tested of the multi-port antenna is connected with the COM port of the 64-path radio frequency switch 801, the intermodulation index of the multi-port antenna can be tested, and meanwhile, the active impedance parameter of the multi-port antenna can also be tested. The II channels of 64 radio frequency switches 801 are directly connected with an active impedance test system, a phase matrix 607(1 x N) is connected in series with a port 1 of a vector network analyzer 702, a phase shifter and an attenuator module are arranged in the phase matrix 607, the air interface analog channel simulation is realized by numerical control phase shifting and amplitude modulation technology, a beam forming network matrix controlled by phase and amplitude is realized by using a scheme of a highest-precision numerical control phase shifter and a numerical control attenuator aiming at the characteristics of a super-large-scale multi-input and multi-output system, compared with the existing software algorithm in the industry, the channel simulation is more real, and the requirements of a 5G Massive MIMO test system are met by combining a high-precision phase amplitude calibration algorithm.
In this embodiment, the active impedance testing system includes a phase matrix 607, a switch matrix 701, and a vector network analyzer 1001, where the phase matrix 607 is connected to a circulator 901 through a first coupling unit, the circulator 901 is connected to a channel ii of a 64-channel radio frequency switch 801, a coupling port of the first coupling unit is connected to an input port of the switch matrix 701, a port 3 of the circulator 901 is connected to a second coupling unit, a coupling port of the second coupling unit is connected to an input port of the switch matrix 701, and a COM port of the switch matrix 701 is connected to a second port of the vector network analyzer 1001.
The first coupling unit comprises couplers (601,602,603) and a coupler (604,605,606), wherein the couplers (601,602,603) are connected in series behind a phase matrix 607, a circulator (901,902,903) is connected in series behind the couplers (601,602,603) and transmits phase signals to a channel II of a 64-channel radio frequency switch 801, coupling ports of the couplers (601,602,603) output coupled forward coupling signals to input ports of a switch matrix 701, a port 3 of the circulator (901,902,903) is respectively connected with the input ports of the couplers (604,605,606), a coupling port of the coupler (604,605,606) outputs reverse coupling signals to the input ports of the switch matrix 701, the forward coupling and the backward coupling radio frequency signals collect forward and reverse power and transmit the forward and reverse power to the input ports of the switch matrix 701, a COM port of the switch matrix 701 is connected with a port 2 of a vector network analyzer 702, and active impedance parameters of the antenna are calculated.
In this embodiment, the switch matrix 701 may extend and add multiple ports, flexibly configure units, and perform corresponding channel addition on units divided by the switch matrix of the multiband intermodulation test system, that is, add coaxial switches, when the types of units to be tested are increased and the number of channels to be tested is increased.
In this embodiment, the vector network analyzer 1001 is an Agilent high-performance vector network analyzer, the frequency covers 10MHz to 50GHz, the receiver has high test sensitivity, and can meet the test dynamic range requirements of various tested devices and accurately test the active impedance parameters of passive devices.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes or modifications may be made by the patentees within the scope of the appended claims, and within the scope of the invention, as long as they do not exceed the scope of the invention described in the claims.
Claims (4)
1. The utility model provides an array antenna intermodulation and active impedance test system which characterized in that: the device comprises a transmitting device, a receiving device, a combiner unit, a duplexer module, a 64-channel radio frequency switch, a multi-port antenna array and an active impedance test system; the output end of the transmitting device is connected with the inlet and the outlet of the combining unit, the output port of the combining unit is connected with the transmitting TX port of the duplexer module, the ANT port of the duplexer module is connected with the I-path channel of the 64-path radio frequency switch, the II-path channel of the 64-path radio frequency switch is connected with the input end of the active impedance test system, the COM channel of the 64-path radio frequency switch is connected with the tested port of the multi-port antenna array, the radio frequency signal of the duplexer module is transmitted to the tested port of the multi-port antenna array through the COM port of the 64-path radio frequency switch, and the phase shift amplitude modulation parameter signal of each port of the multi-port antenna array is switched to the active impedance test system through the II-.
2. The array antenna intermodulation and active impedance test system of claim 1, characterized in that: the transmitting device comprises a first signal source, a second signal source, a first power amplifier, a second power amplifier, a combiner and a combiner module, wherein the first signal source is connected with the first power amplifier, the second signal source is connected with the second power amplifier, the output end of the first power amplifier is connected with the first input end of the combiner, the output end of the second power amplifier is connected with the second input end of the combiner, the output end of the combiner is connected with the input port of the combiner module, the output port of the combiner module is connected with the TX reflection port of the duplexer module, the combiner is used for power combining two received signals, and the combined power signal transmits the power signal to the TX port of the duplexer module through the combiner module.
3. The array antenna intermodulation and active impedance test system of claim 1, characterized in that: the receiving device comprises a radio frequency switch unit, a receiving filter and a digital receiver module, wherein the output end of the radio frequency switch unit is connected with an RX channel of the duplexer module, a COM port of the radio frequency switch unit is connected with the input end of the receiving filter, and the output end of the receiving filter is connected with the input end of the digital receiver module.
4. The array antenna intermodulation and active impedance test system of claim 1, characterized in that: the active impedance test system comprises a phase matrix, a switch matrix and a vector network analyzer, wherein the phase matrix is connected with a circulator through a first coupling unit, the circulator is connected with II channels of 64-path radio frequency switches, a coupling port of the first coupling unit is connected with an input port of the switch matrix, a 3 rd port of the circulator is connected with a second coupling unit, a coupling port of the second coupling unit is connected with an input port of the switch matrix, and a COM port of the switch matrix is connected with a second port of the vector network analyzer.
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| CN201910997170.4A CN110677202A (en) | 2019-10-20 | 2019-10-20 | Array antenna intermodulation and active impedance test system |
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| CN201910997170.4A CN110677202A (en) | 2019-10-20 | 2019-10-20 | Array antenna intermodulation and active impedance test system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205336291U (en) * | 2015-12-30 | 2016-06-22 | 奥维通信股份有限公司 | Multisystem intermodulation test platform |
| US20170176507A1 (en) * | 2014-04-08 | 2017-06-22 | Analog Devices Global | Active antenna system and methods of determining intermodulation distortion performance |
| CN108931704A (en) * | 2018-06-19 | 2018-12-04 | 南京纳特通信电子有限公司 | A kind of 32 ports band S parameter passive cross modulation test instrument |
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- 2019-10-20 CN CN201910997170.4A patent/CN110677202A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170176507A1 (en) * | 2014-04-08 | 2017-06-22 | Analog Devices Global | Active antenna system and methods of determining intermodulation distortion performance |
| CN205336291U (en) * | 2015-12-30 | 2016-06-22 | 奥维通信股份有限公司 | Multisystem intermodulation test platform |
| CN108931704A (en) * | 2018-06-19 | 2018-12-04 | 南京纳特通信电子有限公司 | A kind of 32 ports band S parameter passive cross modulation test instrument |
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