A Novel Dual-Band (38/60 GHz) Patch Antenna for 5G Mobile Handsets

A compact dual-frequency ([Formula: see text]) 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 ([Formula: see text]). 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 ([Formula: see text]). Numerical and experimental results show good performance regarding return loss, bandwidth, radiation patterns, radiation efficiency, and gain. The impedance matching bandwidths achieved in the [Formula: see text] and [Formula: see text] bands are about [Formula: see text] and [Formula: see text] , respectively. The minimum value of the return loss is [Formula: see text] dB for the [Formula: see text] band and [Formula: see text] for the [Formula: see text] 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.