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This paper introduces a compact millimeter-wave tunable filtenna with defected ground-plane structure (DGS) resonators for future fifth generation (5G) applications. An approach of adding the lumped and tunable elements within the DGS resonating structure is introduced. The designed filtenna has achieved a good reflection coefficient $\left |{ \mathrm {S}_{11} }\right |$ lower than -25 dB with a realized gain higher than 9 dB at any of the tuned frequency bands. A good agreement is achieved between the measurements and the simulated results those produced from both the finite difference time domain method (FDTD) Matlab coded and the CST-MWS simulation program. Furthermore, a circular array consists of 16 antenna elements is designed to be integrated into 5G router device. Different scenarios have been considered to show the array performance capability to maximize the array directionality in certain directions at certain frequency and in other directions with another frequency band. Finally, the scan pattern with the coverage efficiency are presented to illustrate the capability of the designed array as a key piece of future 5G routers.

Design of Compact mm-wave Tunable Filtenna Using Capacitor Loaded Trapezoid Slots in Ground Plane for 5G Router Applications