Wideband printed loop-dipole antenna with magnetic-electric coupling

In this letter, a wideband printed loop-dipole antenna with magnetic-electric coupling is proposed. The proposed antenna consists of two coupled metallic split rings with slits on opposite sides and a parasitic metal strip. Two coupled split-rings can generate multiple operational modes such that multi-frequencies resonance can be formed. And in order to expand the bandwidth and improve the impedance matching, a parasitic metal strip besides the feed line is added. Simulated results show that the proposed antenna not only covers the low band at approximate 0.82 GHz, but also has a good fractional bandwidth of 66.7% ranging from 2.3 to 4.6 GHz. Stable unidirectional radiation patterns in the operating bandwidth are also achieved.