A planar wideband quasi-isotropic antenna based on triple current line sources theory

A planar quasi-isotropic antenna is proposed in this paper. The proposed antenna is analyzed based on the theory of triple current line sources. Quasi-isotropic radiation is produced when three dipoles are arranged in H-shape. The proposed H-shape antenna is compared to the existing U-shape antenna to show its advantages in both impedance bandwidth and 3dB gain variation bandwidth. The use of printed dipoles also reduces the difficulty of feeding. The simulated results show that the antenna provides a 10.2% impedance bandwidth from 2.33 GHz to 2.58 GHz. The peak gain is 0.95 dBi and the gain variation of the entire impedance bandwidth is less than 3 dB.