A Broad-Band Microwave Circulator
Ohm, E.A.
Microwave Theory and Techniques, IRE Transactions on
Volume 4, Issue 4, October 1956 Page(s):210 - 217
Digital Object Identifier   10.1109/TMTT.1956.1125064
Summary:The discovery of a simple, low loss way to hold Faraday rotation constant over a broad-band (coupled with the development of wide-band, high return loss, circular-to-rectangular waveguide transformers, and polarization couplers) has made it possible to design and build a high quality circulator for use in the 10.7 kmc to 11.7 kmc band. The essential characteristics of the described unit include a more than 30-db return loss at each terminal, an isolation of 30 db or greater between "isolated" terminals, and a 0.35-db insertion loss between transmission terminals.

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