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Analysis and Design of Circular Waveguide Polarizers with Elliptical Irises

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4 Author(s)
Bertin, G. ; CSELT - Centro Studi e Laboratori Telecomunicazioni V. Reiss Romoli, 274 - 10148 Torino, Italy ; Piovano, B. ; Accatino, L. ; Mongiardo, M.

A new design of a polarizer realized in circular waveguide with the insertion of short lengths of guide with elliptical cross-section is introduced. The new structure, that requires a manufacturing by milling techniques only, compares favourably with circular waveguide implementations, since it is composed only by waveguides with separable cross-section, hence producing a definite advantage in electromagnetic modeling. With respect to previously known solutions using square waveguide sections it has the intrinsic advantage of avoiding the rectangular-to-circular transition when the component is used, as customary, with a circular feed. Measured and theoretical results for a polarizer with a 90° ± 1° differential phase shift over the operating 7.75-8.55 GHz band show a very good agreement.

Published in:

Microwave Conference, 2000. 30th European

Date of Conference:

Oct. 2000