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In this article, two configurations of dual-band equilateral triangular dielectric resonator antennas (ETDRAs) for WLAN applications are proposed namely, configuration-I and configuration-II. The configuration-I uses single ETDRA for dual-band operation; whereas, configuration-II includes two ETDRAs to operate as a dual-band antenna. Both the antenna configurations, which uses 99.7% alumina material having a dielectric constant of ε r = 9.9, are excited to operate in the bands of 2.4 to 2.5 GHz and 5.75 to 5.85 GHz. The antennas are excited using a conventional coaxial feed to have a simple feeding mechanism.Prototypes of both the antenna configurations are fabricated and measured. The radiation characteristics of the antennas are discussed. The circuit analysis for the proposed configurations of the dual-band ETDRA is also performed and an appropriate equivalent circuit for each dual-band ETDRA is presented.Further, the performance of the proposed configurations of the dual-band antennas are also compared with other dual-band DRAs reported in the literature.

This paper investigates the crosspolar performance of a coaxial fed dual mode matched rectangular feed horn. The design of rectangular horn as matched feed for an offset parabolic reflector antenna is presented. Dominant TE10 mode is combined with TE11 mode at the horn aperture. A parametric study was carried out using HFSS to evaluate the horn performance under waveport as well as coaxial feed line excitation. Appropriate methods have been proposed for broadening operation bandwidth of the coax fed horn with a small decrease in the crosspolar performance.

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In this article, a new rhombic dielectric resonator antenna (DRA) is proposed. Dominant mode and a few of the higher order modes that are excited in this DRA are identified through eigen mode analysis performed through computer simulation technology (CST) simulation. Empirical formulae for calculating the resonant frequency of these identified modes are developed through curve‐fitting approximation. Feeding techniques and possible ways of exciting some of these modes generated in such DRA are also detailed. Investigations are further carried out to identify appropriate feed positions to achieve broadband operation of such DRA geometry. The radiation patterns at different frequencies and variation of gain within the antenna bandwidth are measured for a fabricated prototype and compared with the simulation results.