Printed bandpass filter for a double conversion tuner

Wave transmission lines and networks – Resonators

Reexamination Certificate

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Details

C333S202000, C333S204000

Reexamination Certificate

active

07071798

ABSTRACT:
A printed bandpass filter is mounted on a precision substrate to eliminate the need for post-fabrication tuning. The filter input is capacitively coupled to a series of quarter wavelength resonators and the filter output. The quarter wavelength resonators are printed as spirals to reduce filter size. The resonators define the bandpass characteristics of the filter. The filter also weakly couples the input signal to the filter output in a manner to cancel the signal image. Mechanical clips mitigate thermal stress on solder connections when the precision substrate is mounted on a second printed circuit board.

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