Simple Millimeter Wave Dielectric Disc Filter with Very Flat Passband Characteristic
Author: Geist, T.
Source: International Journal of Infrared and Millimeter Waves, Volume 19, Number 6, June 1998 , pp. 887-893(7)
A particular fitter design suitable for millimeter- and submillimeter-waves is presented. By mounting equally spaced dielectric discs of identical thickness inside an overmoded circular waveguide very flat bandpass-filters with a relative bandwidth of about ±6% can be achieved. Normalized to the guided wavelength the air spacing corresponds to 1/4, 3/4, … whereas the thickness of the dielectric disc is an integer multiple of 1/2. This particular design is possible for an odd number of discs only. A design example shows 19 GHz bandwidth at 150 GHz. A typical application is side-band filtering for radiometers at plasma experiments.
Document Type: Research Article
Affiliations: Max-Planck-Institut für-Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany
Publication date: June 1, 1998