Balun filter apparatus

Details Balun filter apparatus Balun filter apparatus

1979-10-12

1980-12-16

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333 26, 333177, 333204, 333246, H01P 1203, H01P 510, H03H 742, H03H 709

Patent

active

042400520

ABSTRACT:
The present invention uses two interconnected baluns with the balanced output of one feeding a balanced input of the other. When this filter is used in conjunction with a signal frequency converter, the balun pair not only provides extremely effective bandpass filtering so as to pass the RF frequencies and not the IF frequencies but, in addition, provides a condition which appears to the IF as a nearly open circuit and thus provides a large amount of reflection or return of the IF signals to the signal converter. Through the use of additional grounding stubs, additional coupling means, increased separation between coupling means and separated ground planes each singularly or in combination, improved performance has been obtained as compared to the prior art.

REFERENCES:
patent: 3818385 (1974-06-01), Mouw
patent: 3835421 (1974-09-01), DeBrecht et al.
patent: 3846721 (1974-11-01), Fritz et al.
patent: 3913037 (1975-10-01), Himino et al.
patent: 4186352 (1980-01-01), Hallford

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