Frequency reconfigurable monopole antenna loaded with dielectric resonator

A frequency reconfigurable antenna using two monopoles integrated on a single ground plane is proposed. One of the monopoles is loaded with ring shaped dielectric resonator for wide-band performance along with frequency agility. The antenna is excited by a switching network consisting of a low loss GaAs SPDT switch for independent operation at different frequencies of 4.53 GHz and 4.82 GHz. Different modes are excited in the DRA for switching conditions of the monopoles which result 23% and 29% of impedance bandwidth, confirming the bandwidth varying characteristic of the antenna. The antenna exhibits stable monopole type omnidirectional radiation pattern with realized gain varying from 1.1 dB-4.6 dB throughout the band which makes suitable for many C-band wireless applications.