CN111337758A - Antenna radiation efficiency measuring method based on reverberation chamber - Google Patents

Antenna radiation efficiency measuring method based on reverberation chamber Download PDF

Info

Publication number
CN111337758A
CN111337758A CN202010164355.XA CN202010164355A CN111337758A CN 111337758 A CN111337758 A CN 111337758A CN 202010164355 A CN202010164355 A CN 202010164355A CN 111337758 A CN111337758 A CN 111337758A
Authority
CN
China
Prior art keywords
antenna
port
reverberation chamber
radiation efficiency
network analyzer
Prior art date
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.)
Pending
Application number
CN202010164355.XA
Other languages
Chinese (zh)
Inventor
王敏
卢田丰
赵永久
陈都
徐千
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing University of Aeronautics and Astronautics
Original Assignee
Nanjing University of Aeronautics and Astronautics
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nanjing University of Aeronautics and Astronautics filed Critical Nanjing University of Aeronautics and Astronautics
Priority to CN202010164355.XA priority Critical patent/CN111337758A/en
Publication of CN111337758A publication Critical patent/CN111337758A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08Measuring electromagnetic field characteristics
    • G01R29/10Radiation diagrams of antennas

Abstract

The invention discloses an antenna radiation efficiency measuring method based on a reverberation chamber, which simplifies the traditional antenna radiation efficiency measuring scheme based on a reverberation chamber reference antenna method on the premise that the reverberation chamber is fully stirred, directly uses a reference antenna with known radiation efficiency as a transmitting antenna and a to-be-measured antenna as a receiving antenna, deduces a measuring equation of the radiation efficiency of the to-be-measured antenna according to the reverberation chamber backscattering theory, and describes the measuring steps in detail. Compared with the traditional reverberation chamber reference antenna method, the measurement scheme provided by the invention reduces the use of the antenna, does not need to change the antenna midway, and can acquire all data samples at one time through the two-port vector network analyzer, thereby reducing half of the measurement workload and improving the stability of the measurement result.

Description

Antenna radiation efficiency measuring method based on reverberation chamber
Technical Field
The invention relates to the field of antenna application and test, in particular to an antenna radiation efficiency measuring method based on a reverberation chamber.
Background
Antenna radiation efficiency is one of the main characteristics of an antenna, being the ratio of the power radiated by the antenna to the real power fed to the antenna, describing the ability of the antenna to transmit and receive signals. The radiation efficiency of the antenna does not need to consider the radiation direction of the antenna, so the antenna is a useful performance index for measuring the efficiency of the mobile equipment with an omnidirectional radiation mode, determines the dynamic range and the useful coverage range of a communication system, and is particularly important for a wireless communication system.
Reverberation chamber environment a microwave reverberation chamber, which is originally evolved from an acoustic reverberation chamber and is composed of a metal shielded resonant cavity and a plurality of irregular metal stirrers, provides a complex electromagnetic environment with high Q value and strong reflection unlike the non-reflection environment provided by a microwave dark chamber, and electromagnetic measurements based on the reverberation chamber are generally performed based on statistical post-processing of sampling parameters. In the measuring process, the state of the stirrer is changed through the control of the motor, so that the field distribution characteristic in the reverberation chamber is changed randomly, and meanwhile, the field intensity in a working area or network parameters between the transmitting antennas and the receiving antennas are sampled. It has been shown that with sufficient agitation, the electromagnetic field distribution within the operating region of an ideal reverberation chamber is a statistically uniform field and is insensitive to the position and polarization direction of the antenna. Based on this characteristic, in recent years, the reverberation chamber has been widely used in the field of electromagnetic measurement, such as an electromagnetic compatibility test, an antenna radiation efficiency measurement, a MIMO throughput test, and the like.
The conventional reverberation room reference antenna method requires an arbitrary antenna as a transmitting antenna and an antenna with known radiation efficiency as a reference antenna. The antenna setting in the reverberation room of the scheme is shown in figure 1, the measurement process is carried out in two steps, the first step is to connect a transmitting antenna with a port 1 of a two-port vector network analyzer, a reference antenna as a receiving antenna is connected with a port 2 of the vector network analyzer, an antenna to be measured is connected with a matched load, the reverberation room is stirred for one period, and samples of the reflection coefficient of the port of the transmitting antenna and the transmission coefficient between a receiving antenna and a transmitting antenna are respectively recorded asAndthe second step is to keep the transmitting antenna unchanged, replace the reference antenna with the antenna to be tested to connect with the vector network analyzer port 2, connect the reference antenna with the matched load, stir the reverberation chamber for a period, measure the reflection coefficient of the transmitting antenna port and the transmission coefficient sample between the transmitting and receiving antennas and respectively mark asAndradiation efficiency η of antenna to be testedAUTThe calculation formula of (2) is as follows:
the traditional measuring method has large workload and insufficient stability of the measuring result.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an antenna radiation efficiency measuring method based on a reverberation chamber aiming at the defects involved in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a method for measuring the radiation efficiency of an antenna based on a reverberation chamber comprises the following steps:
step 1), selecting a radiation efficiency ηREFThe known transmitting antenna is simultaneously used as a reference antenna, is fixed on an antenna turntable through an antenna support and is arranged in a working area of a reverberation room;
step 2), taking an antenna to be detected as a receiving antenna, fixing the receiving antenna through a bracket and placing the receiving antenna in a working area of a reverberation room;
step 3), connecting the reference antenna and the antenna to be measured to a port 1 and a port 2 of the two-port vector network analyzer through cables respectively, and carrying out double full-port calibration on the two-port vector network analyzer, wherein the calibration plane is the tail end of the cable, and the measurement parameter is S11、S12、S21And S22Wherein S is11Is a terminalReflection coefficient of mouth 1, S12For port 2 to port 1 transmission coefficient, S21Is the transmission coefficient from port 1 to port 2, S22Is the reflection coefficient of port 2;
step 4), setting measurement parameters of the two-port vector network analyzer, wherein the measurement parameters comprise a test frequency range, a frequency step length, namely frequency point number, source power and intermediate frequency bandwidth;
step 5), after the reverberation chamber is fully stirred, controlling a horizontal stirrer, a vertical stirrer and an antenna rotary table in the reverberation chamber to rotate, wherein the rotation period step number is N respectivelystirrer1、Nstirrer2And NplatformSimultaneously controlling a two-port vector network analyzer to measure S parameters between the transmitting and receiving antennas, and acquiring N samples of the S parameterssample=Nstirrer1Nstirrer2NplatformLet the k-th set of S parameters as
Step 6), calculating the backscattering coefficient e of each position in the working area of the reverberation chamber by the following formulab
Wherein the content of the first and second substances,i. j is a natural number which is more than or equal to 1 and less than or equal to 2;
step 7), calculating the radiation efficiency of the antenna to be measured according to the following formula:
compared with the prior art, the invention adopting the technical scheme has the following technical effects:
according to the invention, an additional unknown antenna is not needed to be used as a transmitting antenna, the connection between a vector network analyzer and the antenna is not needed to be switched in the measuring process, and all needed parameters can be obtained through the two-port measurement of the stirring period of a single reverberation chamber.
Drawings
FIG. 1 is a block diagram of antenna radiation efficiency measurement based on a conventional reverberation chamber reference antenna method;
FIG. 2 is a schematic flow diagram of the present invention;
FIG. 3 is a schematic diagram of a module for performing measurements according to the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
The invention provides a novel measurement method based on a traditional reverberation chamber reference antenna method of antenna radiation efficiency and on the premise that the reverberation chamber is fully stirred according to the backscattering theory of the reverberation chamber, wherein an antenna in the reverberation chamber is arranged as shown in figure 3, an antenna to be measured is fixed in the reverberation chamber through an antenna support, a reference antenna is fixed in an antenna turntable through the antenna support and then is arranged in the reverberation chamber, a motor control motor, a computer and a two-port vector network analyzer are arranged outside the reverberation chamber, the motor control motor is used for controlling the horizontal stirrer and the vertical stirrer of the reverberation chamber to work, and the computer is used for controlling the motor control motor and the two-port vector network analyzer. During the measurement process, the reverberation chamber is kept in a shielding and closed state.
The specific implementation steps of the invention are shown in fig. 2, and comprise the following steps:
step 1), selecting a radiation efficiency ηREFKnown transmitting antennas are used simultaneously as referenceThe test antenna is fixed on the antenna turntable through an antenna support and is arranged in a working area of the reverberation room;
step 2), taking an antenna to be detected as a receiving antenna, fixing the receiving antenna through a bracket and placing the receiving antenna in a working area of a reverberation room;
step 3), connecting the reference antenna and the antenna to be measured to a port 1 and a port 2 of the two-port vector network analyzer through cables respectively, and carrying out double full-port calibration on the two-port vector network analyzer, wherein the calibration plane is the tail end of the cable, and the measurement parameter is S11、S12、S21And S22Wherein S is11Is the reflection coefficient, S, of port 112For port 2 to port 1 transmission coefficient, S21Is the transmission coefficient from port 1 to port 2, S22Is the reflection coefficient of port 2;
step 4), setting measurement parameters of the two-port vector network analyzer, wherein the measurement parameters comprise a test frequency range, a frequency step length, namely frequency point number, source power and intermediate frequency bandwidth;
step 5), after the reverberation chamber is fully stirred, controlling a horizontal stirrer, a vertical stirrer and an antenna rotary table in the reverberation chamber to rotate, wherein the rotation period step number is N respectivelystirrer1、Nstirrer2And NplatformSimultaneously controlling a two-port vector network analyzer to measure S parameters between the transmitting and receiving antennas, and acquiring N samples of the S parameterssample=Nstirrer1Nstirrer2NplatformLet the k-th set of S parameters as
Step 6), calculating the backscattering coefficient e of each position in the working area of the reverberation chamber by the following formulab
Wherein the content of the first and second substances,i. j is a natural number which is more than or equal to 1 and less than or equal to 2;
step 7), calculating the radiation efficiency of the antenna to be measured according to the following formula:
according to the invention, an additional unknown antenna is not needed to be used as a transmitting antenna, the connection between a vector network analyzer and the antenna is not needed to be switched in the measuring process, and all needed parameters can be obtained through the two-port measurement of the stirring period of a single reverberation chamber.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A method for measuring the radiation efficiency of an antenna based on a reverberation chamber is characterized by comprising the following steps:
step 1), selecting a radiation efficiency ηREFThe known transmitting antenna is used as a reference antenna at the same time, is fixed on an antenna rotary table through an antenna support and is arranged on the antenna rotary tableWithin the working area of the reverberation chamber;
step 2), taking an antenna to be detected as a receiving antenna, fixing the receiving antenna through a bracket and placing the receiving antenna in a working area of a reverberation room;
step 3), connecting the reference antenna and the antenna to be measured to a port 1 and a port 2 of the two-port vector network analyzer through cables respectively, and carrying out double full-port calibration on the two-port vector network analyzer, wherein the calibration plane is the tail end of the cable, and the measurement parameter is S11、S12、S21And S22Wherein S is11Is the reflection coefficient, S, of port 112For port 2 to port 1 transmission coefficient, S21Is the transmission coefficient from port 1 to port 2, S22Is the reflection coefficient of port 2;
step 4), setting measurement parameters of the two-port vector network analyzer, wherein the measurement parameters comprise a test frequency range, a frequency step length, namely frequency point number, source power and intermediate frequency bandwidth;
step 5), after the reverberation chamber is fully stirred, controlling a horizontal stirrer, a vertical stirrer and an antenna rotary table in the reverberation chamber to rotate, wherein the rotation period step number is N respectivelystirrer1、Nstirrer2And NplatformSimultaneously controlling a two-port vector network analyzer to measure S parameters between the transmitting and receiving antennas, and acquiring N samples of the S parameterssample=Nstirrer1Nstirrer2NplatformLet the k-th set of S parameters as
Step 6), calculating the backscattering coefficient e of each position in the working area of the reverberation chamber by the following formulab
Wherein the content of the first and second substances,i. j are all 1 or more and 2 or lessA natural number;
step 7), calculating the radiation efficiency of the antenna to be measured according to the following formula:
CN202010164355.XA 2020-03-11 2020-03-11 Antenna radiation efficiency measuring method based on reverberation chamber Pending CN111337758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010164355.XA CN111337758A (en) 2020-03-11 2020-03-11 Antenna radiation efficiency measuring method based on reverberation chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010164355.XA CN111337758A (en) 2020-03-11 2020-03-11 Antenna radiation efficiency measuring method based on reverberation chamber

Publications (1)

Publication Number Publication Date
CN111337758A true CN111337758A (en) 2020-06-26

Family

ID=71186646

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010164355.XA Pending CN111337758A (en) 2020-03-11 2020-03-11 Antenna radiation efficiency measuring method based on reverberation chamber

Country Status (1)

Country Link
CN (1) CN111337758A (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63165773A (en) * 1986-12-27 1988-07-09 Toshiba Corp Method for measuring radiation efficiency of antenna
US5300939A (en) * 1991-03-14 1994-04-05 Kabushiki Kaisha Toshiba Method and apparatus for measuring antenna radiation efficiency
US20040183547A1 (en) * 2000-03-13 2004-09-23 Per-Simon Kildal Method and an apparatus for measuring the performance of antennas, mobile phones and other wireless terminals
WO2005003795A1 (en) * 2003-06-30 2005-01-13 Telefonaktiebolaget L M Ericsson Testing radiation efficiency of an antenna
JP2008089567A (en) * 2006-09-06 2008-04-17 Yokohama National Univ Radiation efficiency measuring device
CN101675345A (en) * 2007-05-07 2010-03-17 株式会社村田制作所 Radiation efficiency measuring device and radiation efficiency measuring method
CN105227249A (en) * 2015-10-23 2016-01-06 中国人民解放军海军工程大学 A kind of short wavelength emissions antenna radiation efficiency automatic monitoring method and monitoring system
CN107238825A (en) * 2017-06-09 2017-10-10 中国电子科技集团公司第四十研究所 RCS method of testing when a kind of utilization vector network instrument realizes antenna transmitting
CN107942146A (en) * 2017-10-31 2018-04-20 西安空间无线电技术研究所 A kind of microwave radiometer antenna radiation efficiency test method and system
CN108132390A (en) * 2017-12-21 2018-06-08 中国舰船研究设计中心 The method and system of field strength and analog composite field electromagnetic environment in a kind of promotion reverberation chamber
CN108254629A (en) * 2017-12-15 2018-07-06 北京无线电计量测试研究所 A kind of antenna efficiency measuring device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63165773A (en) * 1986-12-27 1988-07-09 Toshiba Corp Method for measuring radiation efficiency of antenna
US5300939A (en) * 1991-03-14 1994-04-05 Kabushiki Kaisha Toshiba Method and apparatus for measuring antenna radiation efficiency
US20040183547A1 (en) * 2000-03-13 2004-09-23 Per-Simon Kildal Method and an apparatus for measuring the performance of antennas, mobile phones and other wireless terminals
WO2005003795A1 (en) * 2003-06-30 2005-01-13 Telefonaktiebolaget L M Ericsson Testing radiation efficiency of an antenna
JP2008089567A (en) * 2006-09-06 2008-04-17 Yokohama National Univ Radiation efficiency measuring device
CN101675345A (en) * 2007-05-07 2010-03-17 株式会社村田制作所 Radiation efficiency measuring device and radiation efficiency measuring method
CN105227249A (en) * 2015-10-23 2016-01-06 中国人民解放军海军工程大学 A kind of short wavelength emissions antenna radiation efficiency automatic monitoring method and monitoring system
CN107238825A (en) * 2017-06-09 2017-10-10 中国电子科技集团公司第四十研究所 RCS method of testing when a kind of utilization vector network instrument realizes antenna transmitting
CN107942146A (en) * 2017-10-31 2018-04-20 西安空间无线电技术研究所 A kind of microwave radiometer antenna radiation efficiency test method and system
CN108254629A (en) * 2017-12-15 2018-07-06 北京无线电计量测试研究所 A kind of antenna efficiency measuring device
CN108132390A (en) * 2017-12-21 2018-06-08 中国舰船研究设计中心 The method and system of field strength and analog composite field electromagnetic environment in a kind of promotion reverberation chamber

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
CHRISTOPHER L.HOLLOWAY 等: "Reverberation Chamber Techniques for Determining the Radiation and Total Efficiency of Antennas", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 *
CHRISTOPHER L.HOLLOWAY 等: "Validation of a Two-Antenna Reverberation-Chamber Technique for Estimating the Total and Radiation Efficiency of Antennas", 《INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY-EMC EUROPE》 *
QIAN XU 等: "A Modified Two-Antenna Method to Measure the Radiation Efficiency of Antennas in a Reverberation Chamber", 《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》 *
QIAN XU 等: "Measure the Radiation Efficiency of Antennas in a Reverberation Chamber without Calibration", 《2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING》 *
吕财海: "混响室法天线参数测试研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 *
曾梦薇: "基于混响室天线效率测试技术研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 *

Similar Documents

Publication Publication Date Title
US10306494B2 (en) System and method for over-the-air testing of milli-meter wave and other beamforming technologies
US9596039B2 (en) Method and device for testing radio frequency index and wireless index of active antenna system
CN104267265B (en) Evaluating system and method based on radio astronomical instrument device electromagnetic radiation
Holloway et al. Reverberation chamber techniques for determining the radiation and total efficiency of antennas
CN103414526B (en) The test system of a kind of wireless radio frequency index and method of testing
US6853198B2 (en) Method and apparatus for performing multiport through-reflect-line calibration and measurement
US8805290B2 (en) Method and system for spatial radio-frequency performance testing based on multiple-antenna system
Kildal et al. OTA testing in multipath of antennas and wireless devices with MIMO and OFDM
Rosengren et al. Characterization of antennas for mobile and wireless terminals in reverberation chambers: Improved accuracy by platform stirring
US20140273873A1 (en) System and method for testing radio frequency wireless signal transceivers using wireless test signals
US7068049B2 (en) Method and apparatus for measuring a device under test using an improved through-reflect-line measurement calibration
US8103470B2 (en) Method, coupler and apparatus for measuring radiated power
US7034548B2 (en) Balanced device characterization including test system calibration
KR101832906B1 (en) Improved method and apparatus for measuring the performance of antennas, mobile phones and other wireless terminals
US9699678B2 (en) Plane wave generation within a small volume of space for evaluation of wireless devices
EP2003800B1 (en) System for determining total isotropic sensitivity (TIS) using target received signal strength indicator (RSSI) value and related methods
US7224941B2 (en) System and method for multi-path simulation
US20050059355A1 (en) System and method for multi-path simulation
GB2519946A (en) Active antenna system and methods of testing
US20030008620A1 (en) Field test chamber arrangement
KR20140093995A (en) Transmit power calibration in a communication system
CN101931472B (en) Benchmark test system and method for adjacent channel interference resisting capacity of RFID reader-writer
CN107543978A (en) The system and method for calibrating radiation channel matrix in MIMO via OTA radiation test system
EP2178222A1 (en) Multi-antenna measurement method and multi-antenna measurement system
CN102158242B (en) System and method for testing antijamming capability of wireless communication products operating at ISM (Industry, Science and Medical) frequency range

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination