Coplanar waveguide‐based ultra‐wide band antenna with switchable filtering of WiMAX 3.5 GHz and WLAN 5 GHz signals

Abstract

Abstract This paper presents a compact single‐layer UWB antenna based on a coplanar waveguide structure. The antenna operates within bandwidth from 3 to 10.6 GHz (111.76%). The antenna incorporates two notch‐filters, designed to mitigate possible interference with WiMAX and WLAN. This filtering function can be switched on or off, independently for each band, by using pin diodes. This feature allows fast adaptation, supporting spectrum sharing solutions with a compact and planar antenna. The simulated and measured results of the proposed antenna are in good agreement, with the maximum antenna gains dropping after activation of the filtering from 2.5 to −10 dBi in WiMAX 3.5 GHz band and from 3 to −8 dBi in WLAN 5 GHz band.