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Method for measuring corrugated horn loss

A corrugated horn and noise measurement technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of large measurement error and difficult measurement, and achieve the effects of reducing influence, high measurement accuracy and simple test system

Active Publication Date: 2015-12-02
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0003] 1. The traditional short-circuit method is used to measure the loss of the corrugated horn. When the corrugated horn works in single mode, it is difficult to measure accurately because the loss of the corrugated horn is very small and the influence of multiple reflections in the measurement system is inevitable;
[0004] 2. The traditional short-circuit method measures the loss of the corrugated speaker. When the corrugated speaker is multi-mode, the measurement error is large due to the influence of the multi-mode of the corrugated speaker.

Method used

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  • Method for measuring corrugated horn loss
  • Method for measuring corrugated horn loss
  • Method for measuring corrugated horn loss

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Embodiment Construction

[0028] refer to figure 1 , The test system consists of a normal temperature load, a cold load, a low noise amplifier, a radio frequency test cable, a spectrum analyzer and a corrugated horn to be tested. The noise temperature of the corrugated horn is calculated by measuring the noise power of the corrugated horn pointing to the normal temperature load and the cold load respectively, and the loss of the corrugated horn is calculated from the noise temperature of the corrugated horn.

[0029] attached figure 1 Shown is a schematic diagram of the principle of measuring corrugated horn loss. In the specific embodiment, the corrugated horn to be tested works in the X-band, and the working frequency ranges from 7.25 GHz to 7.75 GHz. The test frequency is 7.5GHz, the noise temperature T of the low noise amplifier LNA =80K, the noise temperature T of normal temperature load 0 =290K, the noise temperature T of the cold load C =77K. The steps of the measurement method for corruga...

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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 [0001] The invention relates to a corrugated horn feed source of a reflector antenna, and is especially suitable for measuring the corrugated horn loss. Background technique [0002] As we all know, the corrugated horn can have excellent electrical characteristics such as a rotationally symmetrical main polarization pattern, extremely low cross-polarization peak level, good matching characteristics and excellent low sidelobe characteristics in a wide frequency band of 2:1. performance, widely used in high-efficiency feeds for reflector antennas. However, in the application fields of radio astronomy and deep space exploration of the corrugated horn, the loss of the corrugated horn is also a very important indicator. Corrugated horn loss is very small, it is very difficult to measure, and the horn mouth short circuit method is usually used for measurement. This method for measuring corrugated horn loss has the following limitations: [0003] 1. The tradition...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 秦顺友杜彪邹火儿李振生张立军吴伟伟
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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