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<p>Numerical modelling is performed to determine the optimal location geometry of a&#xa0;GaAs-based photoconductive semiconductor switch in a&#xa0;7.2×3.4 mm rectangular waveguide with an opening for microwave wave irradiation at a&#xa0;frequency of 37.28 GHz and an E10 mode. The simulation is performed in a&#xa0;CST Microwave Studio with the determination of the scattering parameters and the optimal-geometry EM field distribution. The scattering parameters calculated for locked and shorted photoconductive semiconductor switches (PCSS) make it possible to attenuate the impacting signal by 17.8 dB or 7.8&#xa0;times and match the reflected signal level within −20 dB. Under these conditions, the principal mode of the impacting signal is transformed, allowing a&#xa0;standing wave to be generated with the PCSS locked and transmitted with low distortion along the waveguide with the PCSS shorted. The geometry calculated in this study would allow solving an important problem of the external field availability for the PCSS transition to a&#xa0;shorted state without any additional external electric field on the PCSS electrodes and to get rid of the microwave signal distortion from the constant component, which needs a&#xa0;further experimental confirmation.</p>

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Calculation of the properties of a rectangular waveguide exposed to 8-mm wavelength microwave radiation

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • V. V. Barmin,
  • P. Yu. Chumerin,
  • I. V. Romanchenko

摘要

Numerical modelling is performed to determine the optimal location geometry of a GaAs-based photoconductive semiconductor switch in a 7.2×3.4 mm rectangular waveguide with an opening for microwave wave irradiation at a frequency of 37.28 GHz and an E10 mode. The simulation is performed in a CST Microwave Studio with the determination of the scattering parameters and the optimal-geometry EM field distribution. The scattering parameters calculated for locked and shorted photoconductive semiconductor switches (PCSS) make it possible to attenuate the impacting signal by 17.8 dB or 7.8 times and match the reflected signal level within −20 dB. Under these conditions, the principal mode of the impacting signal is transformed, allowing a standing wave to be generated with the PCSS locked and transmitted with low distortion along the waveguide with the PCSS shorted. The geometry calculated in this study would allow solving an important problem of the external field availability for the PCSS transition to a shorted state without any additional external electric field on the PCSS electrodes and to get rid of the microwave signal distortion from the constant component, which needs a further experimental confirmation.