Compact Dual Band Notch Semicircular Patch Antenna for C/X/Ku/K Band Applications

A compact (17 × 10 mm²) microstrip patch antenna with dual-band notch characteristics is presented in this article. The designed antenna consists of a semicircular radiating patch and defected ground structure to cover the bandwidths for C/X/Ku/K-band applications. The Defected ground is created by the introduction of slot, slit and copper connecting strip on the ground plane. The measured dual-band notches (6.96–11.12 GHz and 12.97–16.28 GHz) and measured resonating impedance bandwidth 35.53% (4.97–6.96 GHz), 15.06% (11.12–12.97 GHz) and 17.76% (16.28–19.35 GHz) are obtained. The proposed antenna resonates in the quad-band at resonant frequencies of 5.5, 12.4 and 17.3 GHz. The proposed antenna exhibits a nearly stable radiation pattern with a maximum measured gain of 5.17 dBi. The simulated results are validated with experimental results.