Innovative Technique to Realize Circular Polarization Using Sinusoidal Perturbation for Square Microstrip Antenna

摘要

Innovative technique to produce circular polarization for square microstrip antenna using sinusoidal perturbation along its length is suggested. In and Out-of phase addition at corners of square patch degenerate orthogonal mode as function of difference between patch diagonal lengths. Depth of perturbation decides separation between orthogonal modes whereas periodicity defines multiband operation for circular polarization. Proposed structure results in bandwidth more than 320 MHz (35%) and circularly polarized bandwidth 55 MHz (6%). The structure give gain more than 6.5 dBi.