Rajeev Singh

A circularly polarized stub-matched inverted L-shaped antenna for C-band applications is presented in this communication. Antenna parameters of inverted L-shape on the radiating patch and slits, notch, square strips and stub on the ground plane and the effect of these are analyzed. The proposed optimized antenna (A₅: 0.54λ₀ × 0.54λ₀ × 0.02λ₀ mm³) is selected among antennas (A₁ – A₅) with 5.1 GHz design frequency after simulation through high-frequency structure simulator (HFSS). Circular polarization is obtained by introducing stub/perturbation on the ground plane. By introducing stub, the highest measured (S₁₁ < − 10 dB) impedance bandwidth of 50.9% (3.48 – 5.86 GHz) is observed amongst the reported and compared bandwidths. Peak gain of 5.32 dBi and 3 dB axial ratio bandwidth of 16.2% (4.71 – 5.54 GHz) is reported in the present work. An antenna is useful in the entire downlink frequency (3.7 – 4.2 GHz) of the C band.

A compact dual wideband semi‐circular shape micro‐strip patch antenna is proposed for Ku/K band applications. The proposed antenna structure comprises of a modified T‐shape slot on the patch. Simulated and measured bandwidths of 2.12 GHz and 1.92 GHz at lower frequency bands (16.60‐18.72 GHz) and (16.78‐18.70 GHz) respectively are reported. We observe simulated and measured bandwidths of 0.77 GHz and 0.81 GHz at higher frequency bands (22.66‐23.43 GHz) and (22.56‐23.37 GHz), respectively. Ringing resonating frequencies are observed at lower operating band and are responsible for gain degradation.