Method and device for measuring axis ratio of waveguide circular polarizer
A circular polarizer and measurement device technology, applied in the field of satellite communication, can solve problems such as difficulty in fast measurement, inspection and application, open test site environment is easily interfered, and antenna beam center is difficult to accurately align, achieving shortened Measuring time, improving stability and accuracy, avoiding the effects of test condition requirements
Active Publication Date: 2018-03-30
苏州达顺威尔科技有限公司
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Problems solved by technology
The first method needs to accurately test the amplitude and phase of the two signals, so the test time is long, the requirements for instruments and personnel are high, and it is difficult to use in mass production of waveguide circular polarizers
The second method is difficult to accurately align the center of the antenna beam, and the open test site environment is susceptible to interference, etc., the test cost is high, and it is also difficult to meet the needs of rapid measurement, inspection and application
Method used
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Embodiment 1
[0050] Taking the axial ratio measurement of Ka broadband satellite communication waveguide circular polarizer as an example, the operating frequency of the waveguide circular polarizer to be tested is 20GHz for receiving, 30GHz for transmitting, and the circular waveguide with an output waveguide diameter of 11.264mm has an axial ratio of about 1dB. The standard waveguide circular polarizer is also a broadband waveguide circular polarizer for receiving 20GHz and transmitting 30GHz, and its axial ratio is <0.3dB. According to the waveguide transmission theory, the output circular waveguide will have high-order modes in the transmitting frequency band, and the reflection of the high-order modes will seriously affect the test accuracy (fluctuation greater than 2dB) during the reverse polarization test.
[0051] In order to ensure matching with the waveguide circular polarizer to be tested, the influence of high-order modes is eliminated. A dual-polarization attenuator was used i...
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The invention discloses a method and device for measuring the axis ratio of a waveguide circular polarizer. The device comprises a signal source, a first coaxial waveguide converter, a standard waveguide circular polarizer, a dual polarization attenuator, a second coaxial waveguide converter, a spectrum analyzer and a computer connected between the signal source and the spectrum analyzer, whereinthe dual polarization attenuator comprises a tubular shell and an inner cylinder embedded in the shell, the dual polarization attenuator is connected with the standard waveguide circular polarizer anda waveguide circular polarizer to be measured respectively through flanges at two sides, and a waveguide of the inner cylinder and waveguides of the polarizers are communicated and the same in diameter. According to the invention, the cross-polarization isolation between the waveguide circular polarizer to be measured and the standard waveguide circular polarizer is measured, the required axis ratio is automatically converted according to a formula, the measurement time is greatly shortened, the measurement accuracy is improved, and the test result is accurate. The whole measuring device is simple in structure and convenient to use, and can be popularized and used in various production, research and development and test links.
Description
technical field [0001] The invention relates to a method and device for measuring the axial ratio of a waveguide circular polarizer, belonging to the technical field of satellite communication. Background technique [0002] In the field of digital communication or radar technology, waveguide circular polarizers are often used for signal conversion and transmission, and one of the key performance indicators of waveguide circular polarizers is the axial ratio of waveguide circular polarizers. [0003] The traditional waveguide circular polarizer axial ratio measurement method needs to accurately measure the amplitude and phase difference of the signal through the network analyzer, that is, to measure the distance between the two linearly polarized wave components (vertical polarization and horizontal polarization) that make up the circularly polarized wave. The magnitude and phase difference of , so as to complete the calculation of the axial ratio. Or install the circular ...
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Login to View More IPC IPC(8): G01R29/10
CPCG01R29/10
Inventor 吴宏伟王家齐董红
Owner 苏州达顺威尔科技有限公司