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MICROWAVE INSULATION OPTIMIZATION OF PHOTOSWITCHES CONSISTING OF A COPLANAR LINE INTRODUCING A SINGLE-ELECTRODE MSM PHOTODETECTOR

M. El Besseghi, A. Aissat and D. Decoster

In this paper, a microwave insulation optimization of photoswitches consisting of a coplanar line introducing single-electrode MSM photodetectors in the central strip is presented. The characterizations in darkness that have been carried out focus on the measurement of the reflection and the transmission coefficients S11 and S21 respectively. In order to improve the microwave insulation, new topologies of coplanar lines introducing tapers having more complex shapes: sinusoidal and exponential, are studied. The tightening effect of the ground planes around the central strip is studied as well. Results show that using tapers of more complex shapes associated with the tightening of the ground planes around the central strip allows to reach very good insulation values arround -59 dB.