This article presents a novel high gain rotated circular patch antenna operating at S-band. Circular patches are arranged with probe feeding in a particular order to get circular polarization. By employing sequential rotation technique, the proposed antenna is giving an impedance bandwidth of more than 40% (return loss less than-10 dB) and 3dB axial ratio bandwidth of 15% in the operating band with peak gain around 13 dB. Array antenna is fabricated on RT-duroid substrate and the measured results are showing good agreement with the simulation results.

An efficient triband metamaterial absorber is presented for X- and K-band applications. The unit cell is of simple shape. The absorber is fabricated on a thin polyamide, which makes it flexible. The parameters of the designed absorber are optimized. The simulated results show that it has good absorption rate and polarization stability. The stability is exhibited over a wide range in both TE and TE modes of the incident waves. The measured results are on par with the simulated results. The measurement is carried out with the waveguide measurement method.

In this work, an asymmetric ground structured hybrid reconfigurable antenna is designed, on a polyimide substrate material. The antenna model occupies dimensions of 43 × 28 × 0.2 mm, with two F-shaped slots and a U-shaped slot in the radiating structure. The antenna provides an impedance bandwidth of 44% (2.3-3.8 GHz), 12% (4.5-5.1 GHz), and 7% (6.3-6.8 GHz) at three resonant frequencies. Parametric analysis with respect to dimensional parameters is conducted in order to optimize the performance characteristics of the antenna. The asymmetric ground with slots on the radiating structure provides frequency and pattern reconfigurability by means of the placement of BAR 64 diodes , and tunability by means of switching conditions. The proposed antenna provides frequency and pattern reconfigurability in 'S' and 'C' bands for LTE, Wi-Fi, WLAN, and fixed satellite applications. A peak realized gain of 4 dB, and anefficiency of more than 74% is achieved at the fundamental resonant band of the antenna. Four -state frequency reconfigurability, and two -state pattern reconfigurability is achieved with beam steering at 30 • and 330 • in the azimuthal plane. The flexible behavior of the antenna is also analyzed at various bending angles in X and Y-directions, and found to show good agreement with simulation results obtained from Ansys HFSS tool, and with the measurement results of a combinational analyzer in the anechoic chamber.

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