1-D Wideband Phased Dielectric Resonator Antenna Array With Improved Radiation Performance Using Characteristic Mode Analysis
Yanting Liu, Wei Zhao, Boyuan Ma, Shaode Huang, Jian Ren, Wen Wu, Hanqing Ma, Zhang Ju Hou
Abstract
A 1-D wideband phased array of the rectangular ring dielectric resonator antenna (RRDRA) is presented for millimeter-wave (mmWave) applications. By using the characteristic mode analysis, it is found that the unwanted higher order mode (HOM) of the RRDRA results in severe gain degradation and high cross-polarization when the array scans. To remedy the problem, each RRDRA is loaded with a pair of silver strips. They can suppress unwanted HOM and enable good scanning performance in a wide frequency range. To demonstrate the idea, a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1\times $ </tex-math></inline-formula> 4 phased RRDRA array was designed, fabricated, and measured for the licensed mmWave bands (24.25–29.5 GHz). Reasonable agreement between the measured and simulated results is observed.