A circular polarizer designed with a dielectric septum loading

Author

Wang, Shih-Wei ; Chien, Chih-Hung ; Wang, Chun-Long ; Wu, Ruey-Beei

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

52

Issue

7

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

1719

Lastpage

1723

Abstract

This paper presents a simple method to realize a circular polarizer by inserting a dielectric septum in the middle of the cylindrical waveguide. Since fixing slots are built to precisely locate the septum, dual-compensation slots are made in the orthogonal plane to balance the effects of the fixing slots. The measured axial ratio is smaller than 0.5 dB and the phase difference is flat in the frequency range from 60 to 62.25 GHz. In addition, the return losses are better than -13 dB for both E_x and E_y polarizations in the same frequency range. This design has the added advantage that poor phase differences resulting from fabrication error or an inaccurate dielectric constant can easily be improved by adjusting the length of the inserted dielectric septum.

Keywords

circular waveguides; dielectric-loaded waveguides; waveguide components; 60 to 62.25 GHz; circular polarizer; cylindrical waveguide; dielectric constant; dielectric septum loading; fixing slots; phase differences; Dielectric constant; Dielectric measurements; Fabrication; Frequency measurement; Phase measurement; Polarization; Propagation constant; Reflection; Slabs; Waveguide discontinuities; Circular polarizer; cylindrical waveguide; dielectric septum;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2004.830487

Filename

1310669