Microwave filter

Details Microwave filter Microwave filter

1976-09-20

1978-02-14

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

325446, 333 35, 333 82R, 333 84M, 363158, H01P 120, H01P 700, H04B 126, H01P 308

Patent

active

040742148

ABSTRACT:
A precisely controlled bandpass/bandstop filter is fabricated by coupling open circuit stubs to a transmission line. The first and second stubs are designed to resonate with the third stub at the center frequency of the passband. Both the first and third stubs are one quarter wavelength long at the center frequency of the stopband, thereby attenuating transmission line signals within this band. The second stub is of a predetermined dimension to attenuate signals at a flyback frequency which occurs within the stopband as a result of interreaction between the stubs.
In a particular application, the filter may be used to significantly enhance the signal to noise characteristic of the mixer portion of a radio receiver.

REFERENCES:
patent: 2915716 (1959-12-01), Hattersley
patent: 3437935 (1969-04-01), Webb
patent: 3497835 (1970-02-01), Tsuda
patent: 3659206 (1972-04-01), Hallford
patent: 3662294 (1972-05-01), Jacobs et al.
patent: 3737815 (1973-06-01), Low et al.
patent: 3870960 (1975-03-01), Hallford et al.
patent: 3943450 (1976-03-01), Otremba

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