Slots-Fed Polarization- and Pattern-Diversity Cylindrical Dielectric Resonator Antenna With High-Gain Characteristic
Xiao Sheng Fang, Lin Luo, Yu Jun Xu, Yu‐Xiang Sun
Abstract
This letter proposes a high-gain polarization- and pattern-diversity dielectric resonator antenna (DRA). It makes use of the high-order HEM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31δ</sub> and TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">02δ+1</sub> modes of the cylindrical DRA. To facilitate this diversity design, the dielectric waveguide model is applied to seek the solution for these two DRA modes. In the design, two sets of slot pairs completely underneath the DRA are employed to excite the HEM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31δ</sub> <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sup> and HEM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31δ</sub> <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</sup> modes separately, which produces the polarization-diversity performance. When these two slot pairs (totally four slots) have equal-amplitude and in-phase inputs, the omnidirectional TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">02δ+1</sub> mode of the cylindrical DRA is excited, which combines with the previous broadside HEM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31δ</sub> modes to obtain the pattern-diversity performance. For demonstrating the idea, a slots-fed polarization- and pattern-diversity cylindrical DRA made of K9 glass is designed for WLAN-5.8 GHz application. Measured result show the proposed DRA provides a peak gain of 6.02 dBi, which is a new high by compared with other reported polarization- and pattern-diversity DRAs. Besides, the proposed DRA is more appropriate for the microwave integrated circuit since only the planar slot-feeding is required.