An on-glass optically transparent monopole antenna with ultrawide bandwidth is presented\nin this work, and the proposed antenna is of ring shape and coplanar waveguide fed structure. Optically\ntransparent indium tin oxide (ITO) thin film with a thickness of Approximately 160 nm is used as the conductive\nlayer, which is sputtered on an optically transparent glass substrate. An impedance bandwidth of\n6 GHz from 1 to 7 GHz is achieved, with a return loss lower than -10 dB, meaning a fractional\nbandwidth of 150%. The proposed antenna exhibits reasonable radiations of omni-directionality\nin the H plane and bi-directionality in the E plane. Like other transparent antennas discussed in\nliterature, the antenna gain is relatively low (-4 dBi at 5 GHz)...................
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