This paper presents an optically transparent circular shaped microstrip patch antenna. The transparent circular microstrip antenna comprises a thin sheet of soda lime glass substrate with conductive ITO film coating for radiating patch and ground plane and is feed through a CPW feeding technique. The circular shaped patch is modified by inserting inset slit, rectangular slit in patch and nearly rectangular slot in the ground plane for more optical transparent characteristics and shifting resonating frequency toward lower side as well. The targeting frequency of this antenna is 2.4 GHz. The impedance bandwidth of proposed antenna is 3.6 GHz(2GHz–5.6GHz), while the radiation efficiency is 89%. The peak gain over the operating bandwidth is 3.6 dB. The optical transparency is enhanced from 90% to 94.44% due to the use of defected structures both in patch and ground plane. The antenna is circular polarization in nature with axial ratio bandwidth of 1.91 GHz and is a candidate of S-band application.
['Jayashree P. Shinde', 'Pratap N. Shinde', 'N.Y. Gondane']
Circular polarization in transparent circular patch with defected structure