Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1988-06-14
1989-04-18
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333134, 333202, 455 78, H01P 1202, H01P 1213
Patent
active
048230987
ABSTRACT:
A ceramic filter includes a multiple zero bandstop filter function. The ceramic filter has a dielectric block with top and bottom surfaces and at least two holes, including a first hole and a second hole, extending from the top surface toward the bottom surface of the block. The block is selectively covered with a conductive material to provide a transmission line resonator for each of the two holes. The filter also includes an input electrode coupled to the dielectric means at a predetermined distance from the first hole, and an output electrode coupled to the dielectric means at a predetermined distance from the second hole. Finally, conductive plating, in the form of a transmission line, is contiguously disposed on the dielectric means adjacent the two holes and coupled thereto to provide a bandstop filter function with a zero represented at each hole.
REFERENCES:
patent: 3656162 (1972-04-01), Mee
patent: 4418324 (1983-11-01), Higgins
patent: 4423396 (1983-12-01), Makimoto et al.
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4703291 (1987-10-01), Nishikawa et al.
patent: 4740765 (1988-04-01), Ishikawa et al.
patent: 4742562 (1988-05-01), Kommrusch
Schematic of a Motorola transceiver (interconnection diagram); Motorola No. 41A72-C 7/15/77-UP, publication date of Jul. 15, 1977; 1 page.
"Microwave Filters, Impedance Matching Networks and Coupling Structions", by Matthaei, Young & Jones, Figure 12.07-1 (A Strip-Line Band-Stop Filter with Three Resonators) publication date of 1964; 1 page.
Agahi-Kesheh Darioush
DeMuro David M.
Crawford Robert J.
Motorola Inc.
Nussbaum Marvin L.
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