Sharply tuned bandpass filter

Details Sharply tuned bandpass filter Sharply tuned bandpass filter

2005-08-23

2005-08-23

Yenke, Brian P. (Department: 2614)

Television

Receiver circuitry

Tuning

C348S021000, C348S725000, C348S726000, C348S728000, C348S731000, C348S733000, C348S735000, C375S350000

Reexamination Certificate

active

06933986

ABSTRACT:
A sharply tuned bandpass RF filter is presented herein. The filter has an input port for receiving television RF signals and passing same to an output port for application to a load. The filter is tuned such that it exhibits the characteristic of passing only RF signals having frequencies within a given frequency channel out of a plurality of channels, all having the same frequency bandwidth while rejecting all other frequencies. The bandwidth of each channel is on the order of W MHz. The filter exhibits an amplitude response within a mandated mask such that when operated in an RF transmitter the amplitude of the response is attenuated uniformly about the center frequency of the given channel within a frequency range of about ±0.5W MHz to a maximum of about ±(0.5W+0.45) MHz and extending to an attenuated level of about −1 to −18 dB from the in-band power level.

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