DEVELOPMENT OF C-BAND FERRITE DUPLEXER.
Technical rept. no. 4 (Final), 1 Nov 63-15 May 65,
SPERRY RAND CORP CLEARWATER FLA SPERRY MICROWAVE ELECTRONICS DIV
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The development of a C band, all solid state radar front end utilizing high quality state-of-the-art ferrite devices, completely passive in nature, and serving as a fail-safe duplexer-limited with the option of frequency preselection is presented. The duplexers consist of a 4 port singlejunction circulator and associated limiters. The ferrite limiter assembly is made up of a waveguide subsidiary resonance limiter with a dual-sphere, broadband, gyromagnetic coupling limiter or a single-sphere, narrow band, gyromagnetic coupling limiter and a varactor cleanup limiter. The theory and development of the circulator and limiter are discussed in detail. The circulator consists of ferrimagnetic disks placed at the center of a coplanar 90 degrees, WR187 waveguide junction. The ferrimagnetic disks are biased close to resonance and support circulation to one adjacent port while isolating all others. The dualsphere limiter is constructed in strip transmission line and utilizes both first and second order limiting processes to obtain the desired dynamic range and low level limiting threshold. Gyromagnetic coupling techniques and modern network synthesis have been employed to obtain the instantaneous bandwidth of greater than 10 percent. Final high power and low power test results are reported and analyzed. Author