Improved DGS parameter extraction method for the polarization purity of circularly polarized microstrip antenna

An improved method of parameter extraction of the most popular dumbbell shaped defected ground structure (DGS) is developed, which removes the drawbacks of the earlier approaches of parameter extraction methods. The proposed method is validated considering a circularly polarized (CP) microstrip antenna integrated with dumbbell shaped DGS for application of suppression of cross polarization. A set of fabricated laboratory prototypes, with and without DGS, is experimentally studied. The results show that the integration of DGS with antenna provides polarization purity of about 10 dB compared to the same patch without DGS at bore-sight of the patch and enhances the return loss bandwidth about 40%. Good agreement among theory, simulated results, and the experimental results qualifies the proposed method as an effective tool for parameter extraction of the DGS. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2016.

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