Microwave distributed-constant band-pass filter comprising proje

Details Microwave distributed-constant band-pass filter comprising proje Microwave distributed-constant band-pass filter comprising proje

1978-01-20

1980-08-05

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333206, 333212, H01P 120, H01P 706, H01P 704

Patent

active

042164486

ABSTRACT:
A microwave distributed-constant filter of a band-pass characteristic having at least one attenuation pole comprises resonator rods, each of which has an open and a shorted end and of which two first 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 projection 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 inductively 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 resonator 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.

REFERENCES:
patent: 2749523 (1956-06-01), Dishal
patent: 3737816 (1973-06-01), Honicke
IEEE Trans. on Microwave Theory and Techniques, Jun. 1966, pp. 295-296, Kurzok, R. M. "General Four-Resonator Filters at Microwave Frequencies".

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