Experimental Investigations on Wideband Triangular Dielectric Resonator Antenna

Abstract

An isosceles 30°–75°–75° triangular dielectric resonator antenna (TDRA) is excited using coaxial probe. The antenna gives a measured 47.4% impedance bandwidth, which is much wider than the earlier reported work (5.5%) covering 4.33–7.02 GHz. The wideband is due to the multimode excitation of the ${\mathbf {TM}}_{\mathbf {101}}^{\mathbf {z}}$ and ${\mathbf {TM}}_{\mathbf {103}}^{\mathbf {z}}$ modes. Radiation patterns at different $\vphantom {^{\int }}$ frequencies (5.2, 5.3, 5.8, and 6.5 GHz) are given to show its broadside radiating property. It is found that the TDRA gives good differences between copol and cross-pol (approximately 20 dB) in the broadside direction. This antenna is suitable for IEEE 802.11a/h/j/n, U-NII band applications.