Abstract
AbstractCompact‐size quad‐band () microstrip patch antenna is proposed for the fifth generation (5G) mobile handsets. The present paper introduces a new method to reduce the size of a 28‐GHz rhombic patch antenna so as to properly operate at the higher frequency bands () without negative effects on the antenna characteristics at 28 GHz. A novel design is introduced for the quad‐band patch antenna to include complicated radiation mechanisms required for multiple‐band operation. The proposed antenna is constructed as primary and secondary patches which are capacitively coupled and designed to realize impedance matching and to produce appropriate radiation patterns in the four frequency bands. Numerical and experimental investigations are achieved to assess the performance of the proposed antenna including the return loss, radiation patterns, and efficiency. It is shown that the simulation results agree with the experimental measurements and both show good performance. The bandwidths achieved around , , , and are about , , , and , respectively.
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