Simple Millimeter Wave Dielectric Disc Filter with Very Flat Passband Characteristic |
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Authors: | Thomas Geist |
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Institution: | (1) EURATOM Association, Max-Planck-Institut für-Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany |
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Abstract: | 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. |
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Keywords: | Plasma diagnostic filter radiometry |
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