Broadband polarization rotator for arbitrary angles with enhanced substrate integrated waveguide cavities |
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Authors: | Masoud Sharifian Mazraeh Mollaei Esmaeel Zanganeh Reza Heydarian Fazel Rangriz Rostami Seyyed Mohammad Pourangha |
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Affiliation: | 1. Department of Electronics and Nanoengineering, Aalto University, Espoo, Finland;2. Department of Electrical Engineering, Iran University of Science & Technology, Tehran, Iran;3. Department of Electrical Engineering, University of Guilan, Rasht, Iran;4. Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran |
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Abstract: | A broadband polarization rotator for rotating linear polarization to every intended angle is introduced. The proposed rotator is constituted of frequency selective surface and enhanced substrate integrated waveguide (SIW) cavities. Considering the current distribution of circular or square SIW cavity dominant modes, two slots are inserted on the front and back surfaces of the enhanced SIW cavities where the arrows of distributed current are orthogonal to them. Accordingly, the angle between the input and output slots determines the amount of polarization rotation. Moreover, a method of cascading enhanced circular and square SIW cavities for the proposed structure is analyzed to produce a sharper roll‐off response in stop‐bands. Design and simulation of the proposed method are presented for , , and polarization rotators in Ka frequency band with 35 GHz central frequency. To verify the proposed method, a prototype of polarization rotator is fabricated and measured. The measurement demonstrates 18.8% bandwidth which proves broadband performance of the proposed structure. |
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Keywords: | frequency selective surface polarization substrate integrated waveguide |
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