The fabricated and tested MIMO antenna shows UWB response and good isolation between the antenna elements, making it suitable for UWB MIMO applications. Ref. [5] proposes efficient helical and FRF interleavers for OFDM systems, enhancing reliability and throughput. The study compares FFT-OFDM with DWT-OFDM using various wavelet families and channel models. The results show DWT-OFDM outperforms FFT-OFDM, particularly with the Haar wavelet. The simulation indicates FRF interleaving improves the BER for FFT-OFDM, while DWT-OFDM's FRF interleaver performs similarly to the helical interleaver. The recommendation is to use FRF interleaving for FFT-OFDM, improving energy efficiency. Further research is needed to compare conventional interleavers with the proposed FRF interleaver. Ref. [6] presents a broadband optical nano-antenna with a hybrid plasmonic feed, designed for nano-photonic applications. The antenna exhibits a gain of up to 11.4 dBi and covers a wide range of optical communication wavelengths. It features a unique hybrid plasmonic waveguide-based feed that enables directional radiation properties. The antenna is suitable for inter- and intra-chip optical communications and sensing applications. The study also explores array configurations to increase gain and directionality, making it useful for optical energy harvesting. Ref. [7] presents the optimization of a coherent dual-beam array feed network for aperiodic concentric ring antennas. The feeding system is based on a reconfigurable topology with alternated power dividers and combiners, providing coherent in-phase outputs. The study analyzes a two-beam architecture with multi-beam shaping and steering features, and optimizes the aperiodic layout based on the radii of the circular rings using the differential evolution method. The numerical experiments validate the improved performance of the proposed dual-beam configuration with a non-uniform layout compared to its uniform counterpart. The results show an enhanced performance in terms of sidelobe level and directivity. Ref. [8] studies a compact concentric structured wideband antenna with triple notch bands was designed and experimentally demonstrated. The antenna exhibited a broad impedance bandwidth of 45.83 GHz (1.67-47.5 GHz) with three notches at 1.8-2.2 GHz, 4-7.2 GHz, and 9.8-10.4 GHz to minimize interference from the AWS, C, and X bands, respectively. The simulated and measured results of the VSWR, gain, and radiation pattern showed good agreement. The antenna also demonstrated excellent time-domain characteristics, including minimal pulse distortion and constant group delay. A comparative analysis with existing designs showed that the proposed antenna outperformed in terms of bandwidth, gain, and rejection levels. Overall, the designed antenna is a promising solution for pulse-based wideband communication systems. Ref. [9] describes a modified Franklin array antenna for 5G wireless applications operating at 22.7 and 34.9 GHz. The antenna consists of a 3 \(\times\) 3 array patch element and a slotted ground plane, designed for broad bandwidth, high directivity, and dual-band operation. The dimensions of the patch antennas are based on \(\lambda\)/2 of the second resonant frequency. The simulation and measurement results show a dual-band operation with good impedance bandwidth. The antenna performance is analyzed through parametric analysis, and the design is carried out using HFSS v.14.0. The proposed antenna overcomes the limitations of previous collinear arrays and Franklin antennas, offering wideband operation, a compact size, and improved performance.