A Wearable Open-Ring Dielectric Resonator Antenna with Frequency Reconfiguration

A wearable open-ring dielectric resonator antenna (DRA) with frequency reconfiguration is proposed in this paper. The travelling wave mode inside DRA is utilized to achieve wideband characteristic. By varying the insertion depth of the feeding probe, three different operating frequencies can be realized located at 21.2 GHz, 26.3 GHz and 32.7 GHz, respectively. The three operating bands achieve relative bandwidths of 15.6% (19.5 GHz - 22.8 GHz), 12.9% (24.6 GHz - 28 GHz) and 12.2% (30.7 GHz - 34.7 GHz), covering several frequency ranges from K band to Ka band. The simple structure and compact size of the proposed antenna present great potential in the millimeter-wave (mmWave) body area network (BAN) applications.