Novel Modeling and Design of Circularly Polarized Dielectric Resonator Antenna Array

Abstract

Abstract-This paper presents a design of circularly polarized dielectric resonator antenna (DRA) array. The dielectric resonators (DRs) were excited by rectangular aperture coupling slots feed with a linear microstrip. The slot positions were determined based on the characteristic of standing wave ratio over a short ended microstrip to deliver the maximum amount of coupling power to the DRs, in order to improve the array gain Each DR element was rotated 45 • with respect to the sides of the exciting slot to generate circular polarization pattern. The DRA array was modeled and simulated as a parallel RLC input impedance component using Agilent (ADS) software, since that will ensure the resonant frequency of the antenna as primary design step before simulating in (CST) software and doing the measurements. The results of the return loss, gain radiation and pattern axial ratio are shown. The gain of the proposed array in X band was about 8.5 dBi, while the 3 dB axial ratio bandwidth started from 8.14 to 8.24 GHz. The impedance bandwidths started from 8.14 GHz to 8.26 GHz. The proposed DRA exhibited an enhancement of the gain in comparison to a single pellet DRA. The size of the whole antenna structure is about 40 mm × 50 mm and can potentially be used in wireless systems.

Equivalent circuit model of a coaxial excited microstrip‐fed quasi‐lumped element resonator antenna array

“…The subsequent procedures to realise the approximate model of the proposed array is documented in [13,14] although for the dielectric resonator antenna array excited by a rectangular aperture coupling slots and fed by microstrip line. The equivalent circuit of the microstrip feed line is depicted as shown in Fig.…”

Cylindrical dielectric resonator antenna with TE 011 + δ mode

“…The Equation used to calculate the coupling slot impedance is given as [17] 2 1 6 where Z c is the characteristic impedance of the transmission line. R is the voltage reflection coefficient.…”

Equivalent Lumped-Element Circuit of Aperture and Mutually Coupled Cylindrical Dielectric Resonator Antenna Array

“…To build the lumped-element circuit of the aperture coupled CDRA, the same technique is used as presented in [7]. An equivalent lumpedelement circuit for single dielectric resonator is depicted in Figure 5.…”

“…Different types of feeding techniques have been proposed in the literatures to excite the DRAs arrays, such as probe feed, dielectric image guide, coplanar waveguide and microstrip transmission line. Among these different feeding techniques, the microstrip transmission line is more attractive due to low cost, small in size and ease of fabrication [7,8]. In this proposed work, the microstrip transmission line feed is applied.…”