Accession Number : ADA017564

Title :   Design of a Tunable Magnetic Circuit for K and Ka Band Microwave Filters.

Descriptive Note : Technical rept.,


Personal Author(s) : Leupold,Herbert A. ; Rothwarf,Frederick ; Edmiston,Doyle

Report Date : NOV 1975

Pagination or Media Count : 32

Abstract : A tunable permanent magnet structure was designed for use in microwave filters for the K and Ka bands. To avoid the excessive bulk and power consumption of the prototype electromagnet structures previously available, two high energy (1 inch x 3/8 inch) samarium-cobalt-5 permanent magnets were used as field sources and made tunable via electrical solenoids in the flux circuit. Magnetic circuit design calculations predicted that the necessary ambient fields (7.8 and 11.8 kilo-oersteds for the K and Ka bands respectively) were easily attainable in gaps of sufficient size to accommodate the necessary waveguides. Experimental values of field obtained in the gap of a prototype model agreed with the calculated values to within about 3%. The magnets also proved to be tunable over the ranges of both bands. Comparison of the permanent magnet design with existing electromagnet structures shows substantial advantages of the former with regard to weight, bulk and power expenditure.

Descriptors :   *Microwave filters, *Magnetic circuits, K band, Ka band, Samarium intermetallics, Cobalt compounds, Samarium compounds, Magnets, Tuning devices, Permanent magnets

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE