NOVEL MICROWAVE FILTER DESIGN TECHNIQUES.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1966
- Accession Number
- AD0800823
Entities
People
- A. Karp
- David K. Adams
- Edward G. Cristal
- L. A. Robinson
- Leo Young
Organizations
- SRI International