Defected ground structure (DGS)‐integrated rectangular microstrip patch for improved polarisation purity with wide impedance bandwidth

Abstract

Defected ground structure (DGS)‐integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields. Width to length ratio (aspect ratio) of a patch attributes different characteristic features. Therefore present experimental studies have been executed for four different aspect ratio values like 1.6, 1.3, 1.0 and 0.8. Folded defects have been employed in H ‐plane. Possibility of achieving high polarisation purity (over 25 dB isolation between co‐ to cross‐polarised fields) with improved impedance bandwidth has been demonstrated. The variation in XP fields as a function of the patch aspect ratio has been investigated and a strong physical insight into the modal fields with and without DGS has been developed.