Slots-Fed Polarization- and Pattern-Diversity Cylindrical Dielectric Resonator Antenna With High-Gain Characteristic

Abstract

This paper proposes a high-gain polarization- and pattern-diversity dielectric resonator antenna (DRA). It makes use of the high-order HEM <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{31δ}$</tex-math></inline-formula> and TE <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{02δ+1}$</tex-math></inline-formula> modes of the cylindrical DRA. To facilitate this diversity design, the dielectric waveguide model (DWM) 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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{31δ}$</tex-math></inline-formula> x and HEM <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{31δ}$</tex-math></inline-formula> y 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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{02δ+1}$</tex-math></inline-formula> mode of the cylindrical DRA is excited, which combines with the previous broadside HEM <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{31δ}$</tex-math></inline-formula> 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.