A New Differentially-Fed Frequency Reconfigurable Antenna for WLAN and Sub-6GHz 5G Applications

A new differentially fed frequency reconfigurable antenna adopting proximity-coupling feeding for WLAN and sub-6-GHz 5G applications is proposed in this paper. It consists of two substrates that are separated by a 2.5-mm-thick air gap. By configuring the four p-i-n diode switches arranged on the two substrates, the excitation of the radiating patch and the length of the feed-lines can be controlled, and then, two different operating frequency bands can be obtained. The experiments indicate that the designed antenna can be switched between two states operating at 2.45- and 3.50-GHz band, respectively. Good agreement between the simulated and measured results is achieved, and the radiation patterns and gains are similar for the two states. The proposed antenna is a good candidate for WLAN (2.45 GHz) and sub-6-GHz 5G (3.50 GHz) applications.