Pass-band filter having electronically adjustable midfrequency专利检索-梳状滤波器线性滤波器信号处理专利检索查询-专利查询网

Pass-band filter having electronically adjustable midfrequency

阅读：310发布：2022-03-05

专利汇可以提供Pass-band filter having electronically adjustable midfrequency专利检索，专利查询，专利分析的服务。并且A pass-band comb filter utilizes a series of strips and varactors in combination to form parallel resonant circuits at a particular frequency. The pass-band midfrequency can be varied in response to the bias voltage applied to the varactors. Additional capacitors and input and output strips are used to compensate for the insertion attenuation and for matching source and load impedance.，下面是Pass-band filter having electronically adjustable midfrequency专利的具体信息内容。

权利要求

1. An improved midfrequency bandpass comb filter of the type having a casing consisting of a pair of opposing side walls, a plurality of parallel strips, and a number of first capacitors, each of said strips directly connected at one end to one of the side walls, and serially connected at the other end to the other of said side walls by means of each of said first capacitors wherein the improvement comprises: a plurality of varactor diodes having first and second terminals, each of said varactor diodes in common connection with each of said first capacitors by means of said first terminals; and a first source of variable bias voltage, each of said varactor diodes in common connection with said first bias voltage by means of said second terminals, whereby the midfrequency is displaced in response to variations in bias voltage causing variations in capacitance to occur therein said varactor diodes.

2. The bandpass comb filter of claim 1 further including a plurality of second capacitors having first and second terminals, each of said second capacitors connected directly to the other of said side walls by means of said first terminals, and connected serially to the other end of said strip by means of said second terminals, and a plurality of pin diodes each of said pin diodes connected to said second capacitors by means of said second terminals, said filter further including a plurality of surge inductors each of said surge inductors commonly connected between said second capacitors by means of said second terminals, and a second bias voltage source, said pin diodes in combination with said second bias voltage thereby controlling electrical continuity between said second capacitors and said strips depending on bias voltage values applied thereto said pin diodes.

3. The bandpass comb filter of claim 2 further including first and second protection resistors, said first protection resistor serially connected between said first bias voltage source and said plurality of varactor diodes, and said second protection resistor serially connected between said second bias voltage source and said plurality of surge inductors.

4. The bandpass comb filter of claim 1 wherein said plurality of strips comprise four metal strips equidistantly located from each other and wherein said plurality of varactor diodes comprise four varactor diodes each of said foUr varactor diodes coupled with each of said four strips, and wherein each of said varactor diodes is connected in common with said first bias voltage source by means of four electrical connecting members extending through four insulated passages in the other of said side walls.

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Pass-band filter having electronically adjustable midfrequency

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