Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1983-08-15
1985-06-11
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
29600, 333203, 333204, H01P 1205
Patent
active
045231621
ABSTRACT:
Microwave devices are fabricated by a method wherein a block of dielectric material is conformed to the physical configuration of a required microwave device, and it is then coated with electrically conductive material. Portions of the coating material are removed from predetermined regions of the block to implement a predetermined microwave device. One microwave device fabricated in accordance with the foregoing method is shown, and comprises an interdigital bandpass filter in which the block is shaped and drilled with a line of parallel holes to define the physical configuration of an interdigital filter in which the interiorly-coated drilled holes comprise resonator rods within a microwave cavity formed by the exteriorly-coated remaining portions of the dielectric material block. Coating material is removed from end portions of the rods formed by the coated holes in order to fine-tune the filter to a desired center frequency in the band of operation.
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Panasonic Industrial Company Data Sheets (Microwave Dielectric Duplexer and Microwave Bandpass Filter) (Numbered (010S) 83 5 on final page of each).
Electronics, Jul. 14, 1983, "Ceramic-filled Resonator Cuts Costs of Radio-Telephone Filters," T. Uwano, pp. 129-131.
AT&T Bell Laboratories
Nussbaum Marvin L.
Phelan Charles S.
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