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General Theory and Computational Techniques

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Duplexing Ferrite Reciprocal Phase Shifters • Charles R. Boyd, Jr.

The basic structure of microwave ferrite reciprocal phase shifters of the Dual-Mode and Rotary-Field types can readily be adapted to incorporate the function of a circulator outside the phase shifting region.

Stress-Related Insertion Loss in Longitudinal-Field Ferrite Devices • Charles R. Boyd, Jr.

Some microwave ferrimagnetic materials, e.g. compositions of the yttrium-iron garnet family, are known to exhibit sensitivity to intrinsic or externally applied mechanical stress.

Optimum Filling of Ferrite Phase Shifters of Uniform Dielectric Constant • IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-22, No. 4, April 1974 • H. Clark Bell, Jr. and Charles R. Boyd, Jr.

Approximation methods are used to calculate the phase shift and loss for phase shifters containing ferrite and dielectric, with a uniform dielectric constant throughout the waveguide.

Design of Ferrite Differential Phase Shift Sections • 1975 IEEE MTT-S International Microwave Symposium, Palo Alto, CA, May 1975 • Charles R. Boyd, Jr.

Ferrite differential phase shift sections are useful as nonreciprocal circular polarizers in dual-mode phase shifters, as half-wave plates in precision rotary- field phase shifters, and in other devices where nonreciprocal birefringence is desirable.

A Transmission Line Model For The Lossless Ferrite-Loaded Nonreciprocal Waveguide • 1985 SBMO International Microwave Symposium, Campinas, SP, Brazil, July 1985 • Charles R. Boyd, Jr.

In this paper, the lossless TE mode waveguide equivalent-circuit model is extended to permit a description of nonreciprocal phase shift effects by incorporation of distributed gyrators into the elemental line length prototype.

Microwave And Millimeter-Wave Ferrite Phase Shifters • Microwave Journal State-of-the-Art Supplement, September 1989 • William E. Hord

Three ferrite phase shifters–the twin toroid, the dual-mode and the rotary-field–which have found widespread application at microwave frequencies are discussed.

Microwave Phase Shift Using Ferrite-Filled Waveguide Below Cutoff • IEEE Transactions on Microwave Theory and Techniques, Vol. 45, No. 12, Dec. 1997 • Charles R. Boyd, Jr.

Unlike conventional waveguides, lossless ferrite-filled guides may exhibit a complex propagation factor below cutoff of the dominant TE mode when a transverse magnetic bias field is applied.

High Power Reciprocal Ferrite Switches Using Latching Faraday Rotators • 2003 IEEE MTT-S International Microwave Symposium, Philadelphia, PA, June, 2003 • Charles R. Boyd, Jr.

This paper reviews the basic properties of the microwave bridge circuit containing Faraday rotators, with particular emphasis on the fact that high isolation can be preserved over moderate frequency and temperature ranges at the expense of a small increase of insertion loss.