Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1987-11-30
1989-05-23
Nussbaum, Marvin L.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333208, 333212, 333248, H01P 1207, H01P 1213, H01P 512
Patent
active
048334286
ABSTRACT:
A duplexer for use in a feed network for a satellite communications antenna is made in waveguide form and comprises two plate halves each with a pattern of channels on one surface, the pattern on one half being the mirror image of the pattern on the other. When the two halves are assembled with the patterned faces juxtaposed, a receive filter and a transmit filter with receive, transmit and common ports are obtained. Each filter has a main waveguide and several short-circuited half wavelength stubs in serial connection to the main waveguide. The joint between the two halves bisects the waveguide broadwall and is, therefore, of no electrical significance. The simplicity of the design lends itself to fabrication as part of a bigger integral assembly consisting of duplexers and other feed components. After manufacture, no further tuning is necessary.
REFERENCES:
patent: 2421033 (1947-05-01), Mason
patent: 2588226 (1952-03-01), Fox
patent: 2984798 (1961-05-01), Bryan
patent: 3157847 (1964-11-01), Williams
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patent: 3727152 (1973-04-01), Bodonyi
patent: 4200847 (1980-04-01), Nishikawa et al.
IRE Transactions on Microwave Theory and Techniques, vol. MIT-10, No. 6, Nov. 1962, pp. 416-427, New York, US: L. Young et al.: "Microwave Band-Stop Filters with Narrow Stop Bands".
Martin Alain
Mok Chuck K.
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