The design of wideband Quasi-Yagi elliptic dipole antenna with split-ring resonator (SRR) structures

A gain enhancement wideband Quasi-Yagi elliptic dipole antenna is presented in this letter. The gain enhancement is achieved by loading with spliting-ring resonator (SRR) structures in the endfire direction while broad bandwidth is realized by using a microstrip-to-coplanar balun and elliptic dipole elements. The measurement results show the SRRs-loaded antenna presents around 5GHz-8GHz dB gain in the whole working band (5GHz-11GHz), which is around 2 dB more than the unloaded one. This antenna can be used in wireless communication systems for its advantages of broad bandwidth, endfire radiation and high gain.