Quasi-optical narrow-band notch filters

G. G. Denisov

doi:10.1117/12.2298611

30 August 1993 Quasi-optical narrow-band notch filters

G. G. Denisov

Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21044Z (1993) https://doi.org/10.1117/12.2298611
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom

Abstract

A narrow frequency band (20...600 MHz) at frequencies 50...200 GHz and highsuppression (more than 40 dB) are the typical requirements for notch filters used in plasmadiagnostic during experiments with fusion installations. A very narrow frequency bandwidthAf/f=ia3...1a4 in the short millimeter wavelength range implies using of quasi-optical high- quality (Q ?_ 1(1') cavities as elementary cells that constitute a filter, and quasi-optical opentransmission line as a primary waveguide. We considered two possible ways to produce suchcavities (Fig. 1): 1) two-mirror cavity with a standing wave (a), 2) ring cavity with a travelingwave (b). For both cavities coupling is provided by a semi-transparent film or by diffractiongrating. In the first scheme there is a reflected wave, so phase shift (mutual position ofcavities) is important. The second scheme uses only a one-way wave and thus all cells areindependent.

Citation Download Citation

G. G. Denisov "Quasi-optical narrow-band notch filters", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21044Z (30 August 1993); https://doi.org/10.1117/12.2298611

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