Balun filter apparatus

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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Details

333 26, 333246, H01P 1203, H01P 510

Patent

active

043027393

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 so that the overall signal converter operation is more efficient in combination with the present invention than with any comparable known prior art signal isolating device.

REFERENCES:
patent: 2266501 (1941-12-01), Lindenblad
patent: 2368694 (1945-02-01), Watts, Jr.
patent: 3571722 (1971-03-01), Vendelin
patent: 4193048 (1980-03-01), Nyhus
Bawer et al., "A Printed Circuit Balun for Use with Spiral Antennas", Ire Trans. on Microwave Theory and Techniques, May 1960, pp. 319-325.

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