Accession Number : ADD013271

Title :   Microwave Recursive Filter.

Descriptive Note : Patent, Filed 17 Jul 85, patented 28 Apr 87,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Rauscher, Christen

Report Date : 28 Apr 1987

Pagination or Media Count : 8

Abstract : A broadband microwave recursive filter that provides sharp transitions in the frequency domain between adjacent stop and passbands comprising a signal input node; a signal output node; a filter circuit connected between the signal input node and the signal output node for providing a signal flow therebetween which has a predetermined frequency bandwidth characteristic; a microwave transistor circuit, with the microwave transistor circuit being band-limited to provide gain in only a restricted window of frequencies within the predetermined frequency bandwidth and connected for providing amplification to signals flowing in the filter circuit between the signal input node and the signal output node while suppressing out-of-window signals resulting from design approximations. The filter circuit includes a plurality of distributed feedback loop circuits, with each of the feedback loop circuits including the microwave transistor circuit therein, and wherein each of the feedback loop circuits has a different electrical length in relation to the other of the plurality of feedback loop circuits. (Patent)

Descriptors :   *PATENTS, *RECURSIVE FILTERS, *MICROWAVE FILTERS, *BANDPASS FILTERS, AMPLIFICATION, FIELD EFFECT TRANSISTORS, SIGNALS, DELAY LINES, CIRCUITS, APPROXIMATION(MATHEMATICS), FREQUENCY, FEEDBACK, TRANSISTORS, LIMITATIONS, WINDOWS, GAIN

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE