Radio receiver filter with image rejection

Details Radio receiver filter with image rejection Radio receiver filter with image rejection

1990-06-15

1991-07-30

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333176, 455286, H01P 120

Patent

active

050363026

ABSTRACT:
A band pass filter for radio frequencies uses helical resonators arranged to have a transmission notch on the high frequency side of the pass band. A plurality of resonators housed in a shield are formed by quarter-wavelength transmission lines wound in a helix, with adjacent resonators being wound in opposite directions and grounded at opposite ends to provide a transmission notch at the high frequency side of the passband. One or more grounded shielding pins are arranged between adjacent resonators to adjust the frequency of the notch to be at or near an image frequency. The grounded end of each of the resonators may be coupled to a varicap diode network for electronically tuning the filter.

REFERENCES:
patent: 3939443 (1976-02-01), Biro et al.
patent: 4490699 (1984-12-01), Yanagida

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