This paper proposes the design of a compact sub-6 GHz four-port flexible antenna for utilization in 5G applications. A two-arm monopole with a coplanar waveguide feed line printed on a flexible substrate was proposed to shape the single-element antenna. The single element was designed, fabricated, and measured first; then, four copies of the single element were organized on a single flexible substrate to compose the four-port antenna. The MIMO antenna was simulated, fabricated, and experimentally measured. All the simulations and measurements of the flexible single element and MIMO antennas are presented. The presented MIMO antenna showed good impedance characteristics, with a deep level of −24 dB from 3 to 4.12 GHz. The antenna had omnidirectional and bi-directional patterns in the φ = 0° and φ = 90° planes. As an important parameter evaluation for MIMO, the mutual coupling between the different ports was investigated. The diversity gain (DG), the total active reflection coefficient (TARC), the mean effective gain (MEG), the envelop correlation coefficient (ECC), and the channel capacity loss (CCL) parameters were investigated and showed good performance. All the obtained simulation results were in a high degree of agreement with the measurement results, supporting the usage of the suggested antenna in 5G communications.

This article presents a review of the interstitial microwave cancer ablation. Microwave cancer ablation is an effective technique for the cancer therapy using the electromagnetic radiations in the microwave range. The idea behind using the microwave electromagnetic radiations in cancer therapy is basically based on dielectric heating of the cancerous tissues until the death of the infected cells. This article reviews the theory of operation of the microwave cancer ablation technique with overview of the electrical properties of the biological tissues as they are key parameters to study the behavior of the cancer ablation process. Advantages of microwave cancer ablation technique over the other techniques especially its most related one, i.e., the radiofrequency cancer ablation are highlighted. Although the microwave cancer ablation has attained high attention by the researchers, many of challenges which degrade its performance still exist. The paper discusses the challenges of the microwave cancer ablation and highlights the efforts done by the researchers to tackle them. Different antenna structures utilized for microwave cancer ablation are presented with mention of their behavior, advantages and disadvantages. Moreover, some of the most recent progresses in the microwave cancer ablation field are presented.

This paper presents a compact printed antenna based on two folded U-shaped arms radiator for 5G wireless applications. The proposed antenna is intended to work at the 3.5 GHz frequency band. The two arms of the antenna's radiator are U-shaped to miniaturize the size, while the currents are maintained in the same direction during the folding process. Maintaining the current in the same direction over the surface of the antenna guarantees constructive electromagnetic coupling and improves the radiation characteristics of the antenna. The proposed antenna's radiator is printed on the top of an FR4 substrate with a complete ground plane on the bottom side. Dimensions of the antenna are optimized to satisfy the required electrical and radiation characteristics of 5G standards. The overall size of the antenna is 20 × 29 × 1.6 mm3. The proposed antenna is simulated using HFSS simulator, fabricated, and experimentally tested. The conducted measurements show a properly matched antenna over the frequency band 3.42 to 3.62 GHz with its peak resonance existing at 3.5 GHz. The return loss of the antenna is -30.5 dB at the resonance frequency. The antenna has directional radiation pattern with 2.1 dBi maximum gain at the 3.5 GHz frequency. Measurements of the antenna have proved its good characteristics which come in good agreement with the obtained simulation results. The characteristics of the proposed antenna qualify it to be a good choice for 5G applications.