CN105116261A - Method for measuring corrugated horn loss - Google Patents
Method for measuring corrugated horn loss Download PDFInfo
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- CN105116261A CN105116261A CN201510566760.3A CN201510566760A CN105116261A CN 105116261 A CN105116261 A CN 105116261A CN 201510566760 A CN201510566760 A CN 201510566760A CN 105116261 A CN105116261 A CN 105116261A
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- corrugated horn
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Abstract
The invention discloses a method for measuring corrugated horn loss. According to the method, the noise power of a directional normal temperature load and cold load of a corrugated horn are measured respectively, and the noise temperature of the corrugated horn is determined, and therefore, the loss of the corrugated horn can be calculated. The method is simple and feasible, and has popularization and application values.
Description
Technical field
The present invention relates to the corrugation loudspeaker feed source of reflector antenna, be specially adapted to the measurement of corrugated horn loss.
Background technology
As everyone knows, corrugated horn can in the wide-band of 2:1, there is the electric property that the main polarization directional diagram of axisymmetry, pole low-cross polarization peak level, good matching properties and splendid low sidelobe characteristic etc. are excellent, be widely used in the high efficiency feed of reflector antenna.But corrugated horn is in radio astronomy and survey of deep space application, the loss of corrugated horn is also very important index.Corrugated horn loss is very little, measures very difficult, usually adopts hydraucone short-circuit method to measure.The method is measured corrugated horn loss and be there is following limitation:
1, traditional short-circuit method measures corrugated horn loss, and when corrugated horn is single mode operation, because the loss of corrugated horn is very little, and the impact of measuring system multipath reflection is inevitable, is difficult to accurately measure;
2, traditional short-circuit method measures corrugated horn loss, and when corrugated horn is multimode operation, due to the impact of corrugated horn multimode, measuring error is very large.
Summary of the invention
The object of the invention is to avoid the weak point in above-mentioned background technology and propose a kind of method measuring corrugated horn loss.Noise power when the method points to normal temperature load and cold load respectively by measuring corrugated horn, calculates the noise temperature of corrugated horn, calculates the loss of corrugated horn thus.
Measure a method for corrugated horn loss, it is characterized in that comprising the following steps:
(1) noise temperature of corrugated horn is measured: measure noise power during noise power and the corrugated horn sensing cold load of corrugated horn sensing normal temperature load with spectrum analyzer respectively, utilize following formula to calculate the noise temperature of corrugated horn:
In formula:
T '
cthe noise temperature of-corrugated horn, K;
T
0the environment temperature of-Feed Horn, K;
T
lNAthe noise temperature of-low noise amplifier, K;
N
hotwhen-corrugated horn points to normal temperature load, the noise power that spectrum analyzer is measured, dBm;
N
coldwhen-corrugated horn points to cold load, the noise power that spectrum analyzer is measured, dBm;
(2) the loss IL of corrugated horn is calculated
horn: the corrugated horn noise temperature obtained according to step (1), is calculated the loss of corrugated horn by following formula:
In formula:
T
cthe noise temperature of-cold load, K;
Complete the measurement of corrugated horn loss.
Wherein, be specially by the method that the noise power that corrugated horn points to when the noise power of normal temperature load and corrugated horn point to cold load measured respectively by spectrum analyzer in step (1): set up test macro, corrugated horn is pointed to normal temperature load, by the size of spectrum analyzer measurement noises power, use N
hotrepresent; Then corrugated horn is pointed to cold load, keep the state parameter of spectrum analyzer to arrange constant, by the size of spectrum analyzer measurement noises power, use N
coldrepresent.
Wherein, described normal temperature load is microwave absorbing material, and its size should be greater than the area of corrugated horn mouth.
Wherein, described cold load for being immersed in microwave absorbing material in cryogenic liquid, and requires that microwave absorbing material is submerged in cryogenic liquid completely, and described cryogenic liquid comprises liquid nitrogen and liquid helium.
The present invention's tool compared with background technology has the following advantages:
1, utilize the loss of cold and hot load measure corrugated horn, measuring accuracy is high;
2, the method test macro is simple, and can reduce the impact of multipath reflection on measurement result, measuring repeatability is good;
3, the present invention has good promotion and application value.
Accompanying drawing explanation
Fig. 1 is measuring principle figure of the present invention.
Embodiment
With reference to Fig. 1, test macro is made up of normal temperature load, cold load, low noise amplifier, radio frequency testing cable, spectrum analyzer and corrugated horn to be measured.By measuring noise power when corrugated horn sensing normal temperature load and cold load respectively, calculating the noise temperature of corrugated horn, being calculated the loss of corrugated horn by corrugated horn noise temperature.
Shown in accompanying drawing 1, measure the principle schematic of corrugated horn loss.In the middle of specific embodiment, corrugated horn to be measured works in X-band, operating frequency range 7.25GHz ~ 7.75GHz.Test frequency is the noise temperature T of 7.5GHz, low noise amplifier
lNA=80K, the noise temperature T of normal temperature load
0=290K, the noise temperature T of cold load
c=77K.Then the measuring method step of corrugated horn mouth loss is as follows:
1st step: the noise temperature measuring corrugated horn.Shown in accompanying drawing 1, first set up test macro, then corrugated horn is pointed to normal temperature load, by the size of spectrum analyzer measurement noises power, use N
hotrepresent; Subsequently corrugated horn is pointed to cold load, keep the state parameter of spectrum analyzer to arrange constant, in like manner use the size of spectrum analyzer measurement noises power, use N
coldrepresent.By the noise temperature T ' of the noise power calculation corrugated horn measured
c.
In the middle of embodiment, when corrugated horn points to normal temperature load, the noise power-67.38dBm that spectrum analyzer is measured; When corrugated horn points to cold load, the noise power that spectrum analyzer is measured is-71.02dBm.The noise temperature of corrugated horn is:
2nd step: by the noise temperature of the corrugated horn measured, is calculated the loss of corrugated horn by following formula:
The loss of the corrugated horn in the middle of embodiment is:
Principle of work of the present invention is as follows:
The present invention proposes a kind of method measuring corrugated horn loss.
The method, by measuring the noise power that corrugated horn points to normal temperature load and cold load respectively, calculates the noise temperature of corrugated horn, determines the loss of corrugated horn thus.
Claims (4)
1. measure a method for corrugated horn loss, it is characterized in that comprising the following steps:
(1) noise temperature of corrugated horn is measured: measure noise power during noise power and the corrugated horn sensing cold load of corrugated horn sensing normal temperature load with spectrum analyzer respectively, utilize following formula to calculate the noise temperature of corrugated horn:
In formula:
T '
cthe noise temperature of-corrugated horn, K;
T
0the environment temperature of-Feed Horn, K;
T
lNAthe noise temperature of-low noise amplifier, K;
N
hotwhen-corrugated horn points to normal temperature load, the noise power that spectrum analyzer is measured, dBm;
N
coldwhen-corrugated horn points to cold load, the noise power that spectrum analyzer is measured, dBm;
(2) the loss IL of corrugated horn is calculated
horn: the corrugated horn noise temperature obtained according to step (1), is calculated the loss of corrugated horn by following formula:
In formula:
T
cthe noise temperature of-cold load, K;
Complete the measurement of corrugated horn loss.
2. a kind of method measuring corrugated horn loss according to claim 1, it is characterized in that: be specially by the method that the noise power that corrugated horn points to when the noise power of normal temperature load and corrugated horn point to cold load measured respectively by spectrum analyzer in step (1): set up test macro, corrugated horn is pointed to normal temperature load, by the size of spectrum analyzer measurement noises power, use N
hotrepresent; Then corrugated horn is pointed to cold load, keep the state parameter of spectrum analyzer to arrange constant, by the size of spectrum analyzer measurement noises power, use N
coldrepresent.
3. a kind of method measuring corrugated horn loss according to claim 1 and 2, it is characterized in that described normal temperature load is microwave absorbing material, its size should be greater than the area of corrugated horn mouth.
4. a kind of method measuring corrugated horn loss according to claim 1 and 2, it is characterized in that described cold load is for being immersed in microwave absorbing material in cryogenic liquid, and requiring that microwave absorbing material is submerged in cryogenic liquid completely, described cryogenic liquid comprises liquid nitrogen and liquid helium.
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Cited By (4)
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CN107202929A (en) * | 2017-06-23 | 2017-09-26 | 中国电子科技集团公司第五十四研究所 | A kind of method for measuring the loss of rectangular waveguide component |
CN110082610A (en) * | 2019-04-26 | 2019-08-02 | 中国电子科技集团公司第五十四研究所 | A kind of method of measurement standard electromagnetic horn gain |
CN110907733A (en) * | 2019-12-04 | 2020-03-24 | 上海航天测控通信研究所 | Method for testing energy leakage of quasi-optical feed network system |
CN110932696A (en) * | 2019-11-16 | 2020-03-27 | 中国电子科技集团公司第三十九研究所 | Single microwave quantum source device based on low-sidelobe corrugated horn working at normal temperature |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107202929A (en) * | 2017-06-23 | 2017-09-26 | 中国电子科技集团公司第五十四研究所 | A kind of method for measuring the loss of rectangular waveguide component |
CN107202929B (en) * | 2017-06-23 | 2019-05-07 | 中国电子科技集团公司第五十四研究所 | A method of measurement rectangular waveguide component loss |
CN110082610A (en) * | 2019-04-26 | 2019-08-02 | 中国电子科技集团公司第五十四研究所 | A kind of method of measurement standard electromagnetic horn gain |
CN110082610B (en) * | 2019-04-26 | 2021-03-09 | 中国电子科技集团公司第五十四研究所 | Method for measuring standard horn antenna gain |
CN110932696A (en) * | 2019-11-16 | 2020-03-27 | 中国电子科技集团公司第三十九研究所 | Single microwave quantum source device based on low-sidelobe corrugated horn working at normal temperature |
CN110907733A (en) * | 2019-12-04 | 2020-03-24 | 上海航天测控通信研究所 | Method for testing energy leakage of quasi-optical feed network system |
CN110907733B (en) * | 2019-12-04 | 2021-08-10 | 上海航天测控通信研究所 | Method for testing energy leakage of quasi-optical feed network system |
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