A compact wideband four-element multiple-input-multiple-output (MIMO) antenna with high isolation is proposed in this Letter. The proposed MIMO antenna consists of a tapered microstrip line fed rectangular monopole antenna arranged in orthogonal symmetric fashion on the interconnected partial ground plane. The overall size of the proposed antenna is 35 × 35 × 0.8 mm 3 with 9.5 mm edge-to-edge separation between a pair of radiating elements. The proposed MIMO antenna has a −10 dB fractional impedance bandwidth of 49.57% covering 4.4-7.3 GHz, encompassing sub-6 GHz 5G (4.5 GHz), WLAN (5/5.2/5.8 GHz), WiMAX (5.5 GHz), HYPERLAN/1, 2, and ISM bands (5.2/5.8 GHz) applications. The proposed MIMO antenna has a minimum isolation value of 21 dB, maximum envelope correlation coefficient (ECC) value of 0.014 between antenna elements throughout the band. The measured results are found in good agreement with the simulated S-parameters, radiation patterns, ECC, total active reflection coefficient, and channel capacity loss.

Remote Malignant tumor diagnostics plays a significant role in the ability of contemporary medicine to treat cancer illnesses because early stage cancer can be treated successfully by well-developed conventional techniques. Various techniques have been used so far to design such antennas for different type of diseases. This review paper is an output of a detailed survey of various available techniques. The objective of this paper is to provide an overview of these challenges, a nd discuss the ways in which they have been dealt with so far in the literature.