论文信息 - On single‐mode transmission of variable ferrite polarizers in circular waveguide

On single‐mode transmission of variable ferrite polarizers in circular waveguide

High‐order modes are a problem in the design of many ferrite devices. The characteristic equation for the modes in a ferrite variable polarizer, implemented in a dielectric‐filled circular waveguide, is obtained using the mode‐matching method. The conditions to guarantee single‐mode (TE11) operation are also determined. It is shown that when the ferrite thickness has been chosen as t = 0.0377λ0, the valid range of the dielectric thickness should be 0.01λ0 < d < 0.0146λ0 for single‐mode operation. It is shown that the dielectric ring filling can improve the figure of the merit and help to realize the single‐mode transmission in the device. Experimental results from a prototype polarizer are provided as verification of the analysis presented here. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 348–353, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20466

W. Che | E. Yung

[1] E. Yung,et al. Cutoff Characteristics of Modes in a Circular Waveguide Filled With Microwave Ferrite , 2002 .

[2] W. Che,et al. Quadrupole gyromagnetic ferrite circular variable polariser loaded with a dielectric ring , 2001 .

[3] L. Shafai,et al. Cutoff frequencies of circular waveguide loaded with eccentric dielectric cylinder , 1997 .

[4] D. J. Lynch,et al. Normal mode nomenclature of quadrupole gyromagnetic waveguides , 1991 .

[5] W. E. Hord,et al. A New Type of Fast Switching Dual-Mode Ferrite Phase Shifter , 1987, 1987 IEEE MTT-S International Microwave Symposium Digest.

[6] C. R. Boyd,et al. A Dual-Mode Latching, Reciprocal Ferrite Phase Shifter , 1970 .

[7] W. Clark. A Technique for Improving the Figure-of-Merit of a Twin-Slab Nonreciprocal Ferrite Phase Shifter (Correspondence) , 1968 .

[8] E. Stern,et al. Nonreciprocal Remanence Phase Shifters in Rectangular Waveguide , 1967 .

[9] M. C. Mohr,et al. Circularly Polarized Phase Shifter for Use in Phased Array Antennas , 1966 .