Experimental Investigations on Wideband Triangular Dielectric Resonator Antenna

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 TM
^z
₁₀₁
and TM
^z
₁₀₃
modes. Radiation patterns at different 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.