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Multi-Section Bow-Tie Steps for Full-Band Waveguide Polarization Rotation

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3 Author(s)
Ruiz-Cruz, J.A. ; Escuela Politec. Super., Univ. Autonoma de Madrid, Madrid, Spain ; Montejo-Garai, J.R. ; Rebollar, J.M.

A new compact multi-section structure for broadband waveguide polarization rotation is presented. The twist component is based on cascading multiple steps with bow-tie shape geometry, which are progressively rotated between the input and output rectangular waveguides. The twists show an excellent performance in the full operating frequency band, which is controlled with the number of sections and their shapes and can be designed for any rotation angle. Moreover, the bow-tie sections are very short and compact and can be easily manufactured, being well-suited for satellite applications. The proposed configuration is shown with design tables and curves for different rotation angles. Two 90° twists in WR75 waveguide have been tested, showing measured return losses of 30 dB (one section) and 40 dB (two sections) from 10 to 15 GHz with a total length of 5.6 mm and 8.6 mm, respectively.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:20 ,  Issue: 7 )

Date of Publication:

July 2010

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