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Design and cold test of an S-band waveguide dual circular polarizer

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Abstract

Purpose

An S-band dual circular polarizer has been designed and tested with low power in the paper, which will be applied in a spherical cavity pulse compressor. It converts the TE\(_{10}\) mode in rectangular waveguide into two polarization degenerated TE\(_{11}\) modes in cylindrical waveguide.

Methods

The general scattering matrix of the dual circular polarizer has been deduced based on the properties of the passive microwave network, which is suitable for the usual 3 dB coupler, as well as the left/right hand circular polarizer. Based on the 3D code software CST, the dual circular polarizer was numerically simulated. Then, two prototypes have been manufactured and tested with the vector network analyzer (VNA).

Results

The simulation results show that the magnitudes and phase difference of the two TE\(_{11}\) modes are − 3.0103/− 3.0104 dB and 89.79 degrees, respectively. The cold test results show good agreement with CST simulation.

Conclusion

The method of analyzing the relationship between the voltage standing wave ratio (VSWR) and the errors of the magnitudes and phase difference of the two TE\(_{11}\) modes was given, which can be used to qualitatively analyze the properties of the circular polarizer. The S-band waveguide dual circular polarizer can be applied in the pulse compressor, phase shifter or other frequency bands.

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Authors and Affiliations

  1. Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Jie Lei, Xiang He, Guo-Xi Pei, Mi Hou, Hui Wang & Jian-Bing Zhao

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jie Lei

Authors
  1. Jie Lei
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  2. Xiang He
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  3. Guo-Xi Pei
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  4. Mi Hou
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  5. Hui Wang
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  6. Jian-Bing Zhao
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Corresponding author

Correspondence to Jie Lei.

Additional information

Supported by the Youth Found of National Natural Science Foundation of China (11505199).

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Lei, J., He, X., Pei, GX. et al. Design and cold test of an S-band waveguide dual circular polarizer. Radiat Detect Technol Methods 1, 26 (2017). https://doi.org/10.1007/s41605-017-0028-9

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  • DOI: https://doi.org/10.1007/s41605-017-0028-9

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