A compact dual-frequency ( $38/60 \mathrm{GHz}$ ) microstrip patch antenna with novel design is proposed for 5G mobile handsets to combine complicated radiation mechanisms for dual-band operation. The proposed antenna is composed of two electromagnetically coupled patches. The first patch is directly fed by a microstrip line and is mainly responsible for radiation in the lower band ( $38 \mathrm{GHz}$ ). The second patch is fed through both capacitive and inductive coupling to the first patch and is mainly responsible for radiation in the upper frequency band ( $60 \mathrm{GHz}$ ). Numerical and experimental results show good performance regarding return loss, bandwidth, radiation patterns, radiation efficiency, and gain. The impedance matching bandwidths achieved in the $38 \mathrm{GHz}$ and $60 \mathrm{GHz}$ bands are about $2 \mathrm{GHz}$ and $3.2 \mathrm{GHz}$ , respectively. The minimum value of the return loss is $-42$ dB for the $38 \mathrm{GHz}$ band and $-47$ for the $60 \mathrm{GHz}$ band. Radiation patterns are omnidirectional with a balloon-like shape for both bands, which makes the proposed single antenna an excellent candidate for a multiple-input multiple-output (MIMO) system constructed from a number of properly allocated elements for 5G mobile communications with excellent diversity schemes. Numerical comparisons show that the proposed antenna is superior to other published designs.

Beryl mineralization represents one of the most significant gemstones. The radioactive concentrations of ²³⁸U, ²³²Th, and ⁴⁰K in beryl-bearing rocks in South Sinai, Central and South Eastern Desert, Egypt were measured using a portable RS230 gamma spectrometer. ²³⁸U (40 ± 14), ²³²Th (51 ± 19), and ⁴⁰K (1176 ± 277 Bq/kg) are recorded for Ghazala, 54 ± 16, 36 ± 12, and 921 ± 243 Bq/kg for Sedri, 39 ± 15, 27 ± 12, and 842 ± 356 Bq/kg for Igla, 69 ± 16, 34 ± 3, and 1572 ± 83 Bq/kg for Homrit-Akarem, 89 ± 21, 130 ± 16, and 1439 ± 175 Bq/kg for Homrit-Mikpid, and 35 ± 13, 21 ± 12, and 940 ± 645 Bq/kg for Zabara-Um Addebaa. Radiological risk assessment parameters (e.g., annual effective dose, radium equivalent activity) were estimated to deduce the radiation effects on human organs. The obtained results are within acceptable limits.

Direction of Arrival estimation (DoA) is one of the most demanding problems which one has to solve for localizing and tracking multiple rapidly moving targets as in radar, mobile communication and in other areas. In this paper, two new techniques for DoA estimation of signals impinging on the array are proposed. First, the usage of an electronically rotation of the plane of the linear array by small ang le in one dimension DoA estimation is presented. Second, a modified Matrix Pencil (MP) technique for two dimensional DoA estimation is presented. The analysis of the two algorithms is discussed. The accuracy of the DoA estimation of the two proposed techniques is observed through simulated numerical examples.