Accession Number : AD0800823

Title :   NOVEL MICROWAVE FILTER DESIGN TECHNIQUES.

Descriptive Note : Quarterly rept. no. 4 (Final), 1 Jan-30 Apr 66,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s) : Adams, David K. ; Robinson, L. A. ; Karp, A. ; Cristal, Edward G. ; Young, Leo

Report Date : SEP 1966

Pagination or Media Count : 66

Abstract : Earlier work previously reported in Quarterly Progress Reports 1, 2, and 3 is briefly summarized. This work included research on comb-line filters with capacitively coupled terminations; two types of UHF magnetically tunable filters having spherical and disk-shaped resonators; elliptic-function bandstop filters in strip transmission line with quarterly wave and half-wave stubs; circular-iris susceptances in circular TE sub 01-mode waveguide; unloaded-Q measurements in rectangular and circular waveguides with open and conventional walls; nomograms for asymmetric spur-line and parallel-coupled sections; coupled transmission-line couplers with coupled lines of unequal impedances; and data on modified re-entrant directional couplers. The third section of the report describes the application of novel microwave techniques to up-converter design, which has led to the development of a 500- to 1300-MHz tunable up-converter with 20-MHz instantaneous bandwidth. The design method is applicable to other tuning ranges and involves simple construction methods. In the next section, experimental results on a trial capacitively coupled comb-line filter are presented. The trial filter was designed to have a center frequency of 150 MHz and a fractional bandwidth of 0.075. Finally, measured values are given for the unloaded Q of two open-wall cavities. For the TE sub 011-mode in a circular cavity, the cylindrical wall is replaced by a single radial plate midway between the input and output walls. The dissipation loss associated with this open wall is 2.4 times that associated with a solid cylindrical wall. The resulting unloaded Q for an optimum open-wall is 54 percent of that for an optimum solid-wall cavity. (Author)

Descriptors :   (*ELECTRIC FILTERS, MICROWAVE FREQUENCY), (*MICROWAVE EQUIPMENT, ELECTRIC FILTERS), CIRCUITS, CAPACITORS, COILS, RESONATORS, STRIP TRANSMISSION LINES, WAVEGUIDES, TUNING DEVICES, PARAMETRIC AMPLIFIERS, FREQUENCY CONVERTERS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE