부산대학교 도서관

This letter presents a high-gain, low-coupling, omnidirectional, and dual-polarized dielectric resonator antenna (DRA). The high-order TE 021+δ and TM 02δ modes of the cylindrical DRA are used in the design. The TE 021+δ mode is excited by four radial slots with in-phase and equal-magnitude inputs, which produces a horizontal-polarized omnidirectional radiation pattern. A central probe is used to excite the TM 02δ mode, which generates a vertical-polarized omnidirectional radiation pattern. The relatively narrow impedance bandwidths of the two high-order modes present a challenge for the design. To solve this problem, the “×” shape and central air layers are introduced at the vertical planes of the E-fields of the TE 021+δ and TM 02δ modes, respectively, which are found to enhance the impedance bandwidths of the corresponding DRA modes effectively and almost independently. The proposed DRA has an overlapping bandwidth of 7.7%, with a low coupling of −34 dB achieved. Most importantly, it offers a high peak gain of 6.0 dBi.