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Optical control of wave propagation in microstrip-slot lines at D band

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3 Author(s)
Tsutsumi, M. ; Fac. of Eng. & Design, Kyoto Inst. of Technol., Japan ; Shimasaki, H. ; Morgan, G.B.

The dispersion relationships for microstrip-slot lines are analysed by the spectral domain method and evaluated numerically as a function of plasma density for an optically induced plasma. The frequency range considered corresponds to the W and D band range, and the microstrip is realised on high-resistivity silicon. The experimental work was undertaken at frequencies ranging from 90 to 170 GHz using 5 kΩ cm silicon substrates with different strip widths irradiated by light emitting diodes radiating at a wavelength of 820 nm. Optical control was confirmed by measuring the change in propagation loss resulting from the illumination. A wave attenuation of 10 dB was determined for a line length of 30 mm, and a plasma relaxation time of 120 μs was measured at 137 GHz. Applications of this line are briefly discussed

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Microwaves, Antennas and Propagation, IEE Proceedings H  (Volume:138 ,  Issue: 6 )