H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/69
H01P 1/207 (2006.01) H01P 1/205 (2006.01) H01P 1/208 (2006.01) H03H 9/54 (2006.01)
Patent
CA 1094178
ABSTRACT OF THE DISCLOSURE A microwave distributed-constant filter of a band-pass characteris- tic having at least one attenuation pole comprises resonator rods, each of which has an open and a shorted end and of which two first rods are inductively coupled in series through at least one second resonator rod. The first resonator rods are capacitively coupled direct to each other with a pro- jection attached adjacent on at least one of the first resonator rods to the open end thereof. The first resonator rods may be coupled directly to input and output terminals of the filter. Alternatively, two third resonator rods may be interposed between the respective ones of the first resonator rods and the input and the output terminals. The third resonator rods may be induc- tively coupled direct to each other. As a further alternative, two fourth resonator rods may be interposed between the respective ones of the third resonator rods and the input and the output terminals with the third resona- tor rods inductively coupled direct to each other or with the third resonator rods capacitively coupled direct to each other by a projection attached adjacent on at least one of the third resonator rods to the open end thereof. The filter may be of the various coaxial types including the interdigital type.
295343
Kasuga Osamu
Kyuzaki Tsutomu
Omi Satoru
Nippon Electric Co. Ltd.
Smart & Biggar
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