Wave transmission lines and networks – Long line elements and components – Waveguide elements and components
Patent
1978-07-07
1980-09-09
Nussbaum, Marvin L.
Wave transmission lines and networks
Long line elements and components
Waveguide elements and components
333157, 333242, H01P 116, H01P 313, H01P 118
Patent
active
042220181
ABSTRACT:
The invention relates to mode filters for millimetric waves. The mode filter provided includes a circularly sectioned waveguide divided into a number of equal sectorial channels. Dielectric mode perturbing material is provided in all but one of the channels. This material extends in the direction of the H-field so as not to interfere with a wanted mode of a propagated signal but to perturb the current lines of an unwanted TE.sub.On mode so that an -unwanted TE.sub.On mode in the channel containing the dielectric material undergoes a .pi.radian phase shift relative to the TE.sub.On mode in the remaining channel which remaining channel has a conductive sectorial ridge of the same cross section as the sectorial channels and extending in the direction of the H-field the ridge being of such a radius that differential phase shifts produced by the perturbation effect of the mode perturbing material of the wanted mode cut-off frequency are substantially reduced.
REFERENCES:
patent: 3251011 (1966-05-01), Unger
patent: 3351877 (1967-11-01), Unger et al.
patent: 3787787 (1974-01-01), Shimada et al.
Marcuvitz-"Waveguide Handbook" (Radiation Laboratory Series), Boston Technical Publishers, Inc. 1964; pp. 69-80.
Powell Ian L.
Watson Barry K.
Nussbaum Marvin L.
The Marconi Company Limited
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