Wave transmission lines and networks – Long lines – Strip type
Patent
1981-04-28
1983-07-19
Gensler, Paul L.
Wave transmission lines and networks
Long lines
Strip type
333246, H01P 308
Patent
active
043946330
ABSTRACT:
A microstrip microwave circuit having embedded therein at least one suspended substrate stripline region for high Q circuit elements is disclosed. Each suspended substrate region includes an upper ground plane formed by covering the microstrip circuitry of each region with a metallic housing having holes in the sidewalls thereof to permit passage therethrough for the interconnecting circuit paths of the region and by connecting the housing to the top surface of the microstrip ground plane substrate; and a lower ground plane formed by removing the section of substrate lying substantially underneath each high Q region to form openings in the bottom surface of the substrate which are covered by an individual cover plate. The upper and lower ground planes are separated from their corresponding high Q regions by an air spacing dimensioned as a function of the RF impedance desired. Also disclosed herein is a method of making the microstrip microwave circuit including the steps of embedding the least one suspended substrate stripline region for high Q circuit elements therein.
REFERENCES:
patent: 4131894 (1978-12-01), Schiavone
patent: 4281302 (1981-07-01), Stegens
Gensler Paul L.
Westinghouse Electric Corp.
Zitelli W. E.
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