Miniaturized uni-planar CSRR based quad-band antenna-analysis and investigation

This paper presents the detailed design, analysis and measurements of new configuration of quad-band antenna. The antenna is designed using a new uni-planar complementary split ring resonator (UP-CSRR) unit cell. The UP-CSRR unit cell is etched in the top plane of a microstrip patch which reduces the back radiation and enhances the antenna efficiency. The structure has advantage of the presence of complete ground plane that supports a typical broadside radiation. The designed antenna is resonating at 1.9, 3.3, 3.9 and 4.2 GHz with reflection coefficient lower than –10 dB. Moreover, the antenna has a patch size of 3.5 cm × 4 cm which is a consequence of the new IP-CSRR configuration smaller size compared to conventional CSRR.