Bandpass filter with adjustable rejection characteristics

Details Bandpass filter with adjustable rejection characteristics Bandpass filter with adjustable rejection characteristics

H - Electricity

03

H

H03H 7/12 (2006.01) H01P 1/205 (2006.01)

Patent

CA 2179673

The invention relates to a radio frequency filter based on transmission line resonators and having adjustable frequency response characteristics. The invention relates particularly to a bandpass filter in which the transmission zero, or the highly- attenuated frequency area limiting the pass band can be switched between at least two frequency values. To affect the coupling between the transmission line resonators, an electrically conductive regulating element and a switch are placed in their vicinity, and said regulating element can be connected to ground by means of said switch, thereby affecting either the capacitive or the inductive component of the coupling, depending on the location of the regulating element. Stepless adjustment can be realized by replacing the switch with a reactive component, advantageously a capacitance diode.

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