A low profile wideband probe-fed dielectric resonator antenna

Abstract

Many approaches have been presented to broaden the impedance bandwidths of low profile dielectric resonator antennas (DRAs). However, few of them can achieve a balanced behaviour in terms of bandwidth, gain, radiation patterns, antenna size, etc. In this paper, a low profile wideband probe-fed DRA is proposed. By centrally placing a probe-fed strip DR in a 2×2 parasitic DR lattice, balanced antenna performance can be achieved. A DRA prototype was fabricated and tested for demonstration. Measured results show that the antenna can achieve an impedance bandwidth of 24%, a peak gain of 7.92 dBi with a compact DR size of 0.47×0.47×0.07λ₀³ (λ₀ is the wavelength of the center frequency). Besides, symmetrical and consistent radiation patterns can be maintained within the band.