4.7 Article

A Circuit-Driven Design Methodology for a Circular Polarizer Based on Modified Jerusalem Cross Grids

Journal

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 65, Issue 10, Pages 5322-5331

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2017.2740972

Keywords

Circular polarization; equivalent circuit models; frequency-selective surfaces (FSSs); impedance surfaces; polarizers

Funding

  1. Natural Sciences and Engineering Research Council of Canada

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This paper presents an accelerated methodology to design a circular polarizer based on modified Jerusalem cross unit cells. The proposed three-layer planar polarizer features a high transparency to both TE and TM polarized fields while providing a quadrature phase difference between them, as required for the generation of circularly polarized fields. The structure is designed employing a circuit-driven approach in which two independent equivalent circuits describe the behavior of TE and TM modes through the polarizer. Featuring a unit cell volume of 0.17 lambda(0) x 0.17 lambda(0) x 0.21 lambda(0), the polarizer offers axial ratios of less than 3 and 1 dB over 20% and 7% bandwidths around 20 GHz, respectively, with an insertion loss less than 0.4 dB. Full-wave numerical simulations and experimental measurements verify not only the performance of the proposed polarizer but also the accuracy of the circuit-driven approach and its ability as a design tool.

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