CN101819236A - Method for testing antenna gain by using GTEM cell - Google Patents
Method for testing antenna gain by using GTEM cell Download PDFInfo
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- CN101819236A CN101819236A CN201010137145A CN201010137145A CN101819236A CN 101819236 A CN101819236 A CN 101819236A CN 201010137145 A CN201010137145 A CN 201010137145A CN 201010137145 A CN201010137145 A CN 201010137145A CN 101819236 A CN101819236 A CN 101819236A
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Abstract
The invention discloses a method for testing an antenna gain by using a GTEM cell. The method comprises the following steps of: placing an antenna to be tested on a special non-metal turntable in the GTEM cell; arranging a radio frequency signal generator on the port of the GTEM cell; connecting the output end of the antenna with a frequency spectrograph through a cable; testing the receiving power of the antenna; monitoring the rotation of the turntable and data of the frequency spectrograph in real time so as to obtain a maximum value of the receiving power of the antenna; and calculating the gain of the antenna by using a formula provided by the invention. The method has the characteristics of simple operation and low cost.
Description
Technical field
The present invention relates to a kind of application of gtem cell, relate in particular to a kind of method with the gain of gtem cell test antenna.
Background technology
In the test of antenna and communications transmit equipment, the test of antenna gain is an important content.Traditional method need be placed on receiving antenna in free space or the darkroom, need use the canonical reference antenna simultaneously.These test environments or inevitably be subjected to electromagnetic interference (EMI) make measuring error bigger, perhaps waste time and energy, cost height and floor area be big.
Therefore, need a kind of simple, cheap relatively testing apparatus, the test of carrying out antenna gain with gtem cell but is a most suitable selection.With anechoic chamber,, half darkroom relatively, the major advantage of doing antenna measurement with gtem cell provide electric field intensity value accurately, and equipment cost is cheap, floor area is little for can shield outside electromagnetic interference preferably.
Summary of the invention
The purpose of this invention is to provide a kind of method with the gain of gtem cell test antenna simple to operate, with low cost.
The objective of the invention is to be achieved through the following technical solutions:
Of the present invention with gtem cell test antenna gain method, comprise step:
A, antenna to be measured is placed on the special nonmetal turntable in the gtem cell, connects the gtem cell port to radio-frequency signal generator, and antenna output end mouth to be measured is connected with frequency spectrograph by cable;
The radio-frequency signal generator of B, connection port, turntable is rotated a circle along Y-axis, measure the received power value of antenna in this process by frequency spectrograph, find out the position when receiving maximum, on this maximum position, rotate a circle along X-axis again, measure the received power of antenna in this process by frequency spectrograph, the position when power is maximum is the maximum receive direction of antenna for this reason.
C, according to the maximal received power value of measured antenna to be measured under certain power input, this can be worth the gain of calculating antenna in the formula that substitution this method proposed.
As seen from the above technical solution provided by the invention, method with the gain of gtem cell test antenna of the present invention, by rotation to special nonmetal turntable, draw the received power of antenna maximum, calculate with formula proposed by the invention afterwards.Simple to operate, equipment cost is cheap.
Description of drawings
Fig. 1 is the layout synoptic diagram of gtem cell test antenna gain among the present invention;
Fig. 2 is gtem cell coordinate and EUT position view among the present invention;
Fig. 3 is gtem cell, EUT and testing tool connection diagram among the present invention;
Among the figure: 1, gtem cell, 2, middle plate, 3, base plate, 4, port, 5, turntable, 6, antenna to be measured (EUT), 7, radio-frequency signal generator 8, frequency spectrograph.
Embodiment
Method with the gain of gtem cell test antenna of the present invention, the embodiment that it is preferable such as Fig. 1, Fig. 2, shown in Figure 3 comprise step:
A, antenna 6 to be measured is placed on the special nonmetal turntable 5 in the gtem cell, connects the gtem cell port to radio-frequency signal generator 7, and antenna output end mouth 4 to be measured is connected with frequency spectrograph 8 by cable;
The radio-frequency signal generator 7 of B, connection port, turntable 5 is rotated a circle along Y-axis, measure the received power value of antenna 6 in this process by frequency spectrograph 8, find out the position when receiving maximum, on this maximum position, rotate a circle along X-axis again, measure the received power of antenna in this process by frequency spectrograph 8, the position when power is maximum is the maximum receive direction of antenna for this reason.
C, according to the maximal received power value of measured antenna to be measured 6 under certain power input, this can be worth the gain of calculating antenna in the formula that substitution this method proposed.
Described antenna to be measured is placed in the middle plate 2 and 1/3～2/3 zone between the base plate 3 of described gtem cell.
Described antenna to be measured 6 need carry out multi-faceted test, by the rotation of special nonmetal turntable 5 and the reading in the frequency spectrograph 8, under the certain condition of frequency and power, finally can obtain the maximal received power value of antenna 6 to be measured.
According to the test result of gained, calculate the gain of antenna with computing formula proposed by the invention:
G＝10lg?P
out-10lgP
in+10lgh-20lgλ+19.76
In the formula, P
OutBe the received power of antenna to be measured, P
InBe the power input of gtem cell, h is that plate is to the distance between base plate in the measurement point, and λ is a wavelength.
Specific embodiment:
Again referring to Fig. 1, Fig. 2, Fig. 3, with the gain of gtem cell test antenna, it is pyramidal that gtem cell is, and typical length has 7 meters, 4 meters and 3 meters etc., and it is rectangle awl coaxial transmission line model in theory.
The present invention is applied to gtem cell in the measurement of antenna gain, has chosen gtem cell as testing apparatus; In test, used specific nonmetal turntable is with the difference of general turntable: antenna is located at an arbitrary position and can be rotated around X-axis, thereby can access the maximum receive direction of antenna.
The sharpest edges that gtem cell is done antenna gain test be test very simple and floor area little, cheap.Except the requirement of size, this method is treated observation line itself without any restriction, and does not need to dispose other standard antennas and make comparisons.The present invention can test yardstick be 50cm with interior antenna, the test frequency scope is 10KHz to 3GHz.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (6)
1. the method with the gain of gtem cell test antenna is characterized in that, comprises step:
A, antenna to be measured is placed on the special nonmetal turntable in the gtem cell, connects the gtem cell port to radio-frequency signal generator, and antenna output end mouth to be measured is connected with frequency spectrograph by cable;
The radio-frequency signal generator of B, connection port, turntable is rotated a circle along Y-axis, measure the received power value of antenna in this process by frequency spectrograph, find out the position when receiving maximum, on this maximum position, rotate a circle along X-axis again, measure the received power of antenna in this process by frequency spectrograph, the position when power is maximum is the maximum receive direction of antenna for this reason;
C, according to the maximal received power value of measured antenna to be measured under certain power input, this can be worth the gain of calculating antenna in the formula that substitution this method proposed.
2. the method with the gain of gtem cell test antenna according to claim 1 is characterized in that described antenna to be measured is placed in the middle plate and 1/3～2/3 zone between the base plate of described gtem cell.
3. the method with the gain of gtem cell test antenna according to claim 2 is characterized in that, need obtain the maximal received power in all directions of antenna to be measured.
4. the method with the gain of gtem cell test antenna according to claim 3 is characterized in that the mensuration of the maximal received power of antenna to be measured obtains by specific turntable is carried out twice rotation.
5. the method with the gain of gtem cell test antenna according to claim 4, it is characterized in that specific turntable is made of nonmetallic materials, it can do 360 degree rotations along the y axle, and, can do 360 degree rotations around the x axle again on any position of y axle rotation.
6. the method with the gain of gtem cell test antenna according to claim 5 is characterized in that, according to measured antenna maximal received power value, and the gain of calculating antenna to be measured with following described method:
G＝10lgP
out-10lgP
in+10lgh-20lgλ+19.76
In the formula, P
OutBe the received power of antenna to be measured, P
InBe the power input of gtem cell, h is that plate is to the distance between base plate in the measurement point, and λ is a wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010137145A CN101819236A (en) | 2010-04-01 | 2010-04-01 | Method for testing antenna gain by using GTEM cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010137145A CN101819236A (en) | 2010-04-01 | 2010-04-01 | Method for testing antenna gain by using GTEM cell |
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| CN101819236A true CN101819236A (en) | 2010-09-01 |
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| CN201010137145A Pending CN101819236A (en) | 2010-04-01 | 2010-04-01 | Method for testing antenna gain by using GTEM cell |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866375A (en) * | 2012-09-07 | 2013-01-09 | 广东电网公司电力科学研究院 | System and method for calibrating receiving performance of partial-discharge ultrahigh frequency detection device |
| CN106018979A (en) * | 2016-05-19 | 2016-10-12 | 深圳市轱辘车联数据技术有限公司 | FM radiation intensity testing system for vehicle FM intelligent device |
| CN112730996A (en) * | 2020-12-21 | 2021-04-30 | 中国信息通信研究院 | Antenna and passive device measuring method |
Citations (3)
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| CN1242838A (en) * | 1996-06-28 | 2000-01-26 | 西门子信息及通讯网络公司 | Apparatus and method for tetermining source and strength of electro-magnetic emissions |
| KR20090012913A (en) * | 2007-07-31 | 2009-02-04 | 한국전기연구원 | Gtem cell |
| CN101477154A (en) * | 2009-02-13 | 2009-07-08 | 北京邮电大学 | Method for testing antenna omnidirectional radiation total power by using GTEM closet |
-
2010
- 2010-04-01 CN CN201010137145A patent/CN101819236A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1242838A (en) * | 1996-06-28 | 2000-01-26 | 西门子信息及通讯网络公司 | Apparatus and method for tetermining source and strength of electro-magnetic emissions |
| KR20090012913A (en) * | 2007-07-31 | 2009-02-04 | 한국전기연구원 | Gtem cell |
| CN101477154A (en) * | 2009-02-13 | 2009-07-08 | 北京邮电大学 | Method for testing antenna omnidirectional radiation total power by using GTEM closet |
Non-Patent Citations (3)
| Title |
|---|
| MAX W. MUTERSPAUGH 等: "Measurement of Indoor Antennas using GTEM Cell", 《IEEE TRANSACTIONS ON CONSUMER ELECTRONICS》, vol. 49, no. 3, 31 August 2003 (2003-08-31), XP001172095, DOI: doi:10.1109/TCE.2003.1233768 * |
| PING HUI: "Small Antenna Measurements Using a GTEM Cell", 《ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, 2003. IEEE》, vol. 4, 27 June 2003 (2003-06-27), XP010651302, DOI: doi:10.1109/APS.2003.1220373 * |
| 王蔚 等: "GTEM辐射发射自动测试系统", 《电讯技术》, vol. 34, no. 3, 30 June 1994 (1994-06-30) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866375A (en) * | 2012-09-07 | 2013-01-09 | 广东电网公司电力科学研究院 | System and method for calibrating receiving performance of partial-discharge ultrahigh frequency detection device |
| CN106018979A (en) * | 2016-05-19 | 2016-10-12 | 深圳市轱辘车联数据技术有限公司 | FM radiation intensity testing system for vehicle FM intelligent device |
| CN112730996A (en) * | 2020-12-21 | 2021-04-30 | 中国信息通信研究院 | Antenna and passive device measuring method |
| CN112730996B (en) * | 2020-12-21 | 2023-06-16 | 中国信息通信研究院 | Method for measuring antenna and passive device |
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Application publication date: 20100901 |