volume | PIER Journals

Abstract

The circularly polarized design of a 350° sectoral microstrip antenna is proposed. Orthogonal surface current components at TM₁₀ mode on the sectoral patch provide circularly polarized characteristics. With the substrate thickness of 0.087λ_cAR, it yields the simulated axial ratio bandwidth of 18 MHz (1.9%) that lies inside the reflection coefficient bandwidth of 487 MHz (44.66%). A reduction in the substrate thickness by 0.012λ_cAR in the 350° Sectoral design is achieved by employing an H-shape ground plane profile. This design yields the axial ratio bandwidth of 13 MHz (1.45%), which is present inside the reflection coefficient bandwidth of 386 MHz (36.9%). The antenna using modified ground plane offers peak broadside gain of larger than 6 dBi. On conventional and H-shape ground plane design, reconfigurable design of 350° Sectoral patch is presented that offers switching between the wideband and circularly polarized characteristics. For operation at TM₃₀ mode in the Sectoral patch, circularly polarized reconfigurable configuration for sectoral angle decreasing from 340° to 280° is presented. Over this angle variation, antenna offers tuning in the center frequency of axial ratio bandwidth by 367 MHz (20.6%) with a broadside gain of larger than 5 dBi. A design methodology for circularly polarized antennas functioning at TM₁₀ and TM₃₀ modes is proposed. It helps in realizing similar configuration as per specific wireless application. Experimental verifications for all the obtained results are carried out which show close agreement with the simulated results.

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Professor Amit A. Deshmukh

Dr. Heet Mistry

Professor Venkata A. P. Chavali

Dr. Aniruddh Viswanathan

Dr. Prasanna Nadkarni