Satellite broadcasting receiving tuner

Abstract

A satellite broadcasting receiving tuner having a band-pass filter capable of adequately attenuating and removing disturbing wave components having frequencies in the vicinity of 480 MHz and capable of being easily tuned to the high-end frequency. The tuner has at least the band-pass filter for transmitting a down-converted received satellite broadcasting signal and a frequency converter section for converting the received satellite broadcasting signal transmitted through the band-pass filter into a signal having an intermediate frequency. The band-pass filter has a first variable tuning circuit formed of two inductors connected in series and a variable capacitance element branching off from this series connection, a second variable tuning circuit also formed of two inductors connected in series and a variable capacitance element branching off from this series connection, and a trap element connected to a point of connection of the first and second variable tuning circuits to effect selective attenuation at the intermediate frequency. The trap element is a chip capacitor and inductors are strip lines.

Dependencies are inferred from the claim text.