Quasi Planar Circular Microstrip Antenna with Gap-Coupled Pins to Improve Gain and Polarization Purity in H and Diagonal Planes

A modified circular microstrip antenna is proposed for 3 dB increase in co-polar gain and considerable suppression in cross-polar radiations from H and diagonal (φ=45
⁰
) planes. The proposed antenna shows around 10 dB improvement in cross-polar radiations in diagonal plane (φ=45
⁰
plane), which, increases novelty of the design because, achieving low cross-polar radiations from a microstrip antenna in diagonal plane is undoubtedly challenging task.