Suitably shaped metal nanostructures acts as resonant optical antennas that efficiently collect light an confine it to a sub wavelength volume which has been modified by using the dielectric resonators working at optical frequencies. In radio frequencies and microwaves a category of antenna known as dielectric resonator antenna (DRA), whose radiant element is dielectric resonator (DR). In this ...

A novel half Hemispherical Dielectric Resonator Antenna (HDRA) with an array of slots has been designed. The dielectric material used is Rogers TMM10, which is a ceramic thermoset polymer composite material having a dielectric constant of εr = 9.2. Periodic holes lower down the Q factor of the antenna and hence enhance the impedance bandwidth. The measured value of the 10 dB bandwidth is close ...

The Dielectric Resonator Antenna (DRA) is one of the efficient radiator which is used to achieve broadband and cost effective communication in wireless technology. The Substrate Integrated Waveguide (SIW) technology is the most assuring structure for implementation of circuits and components for millimeter wave and microwave applications. A design approach to improve the impedance bandwidth of ...

A novel wideband rectangular dielectric resonator antenna (DRA) is proposed in this paper. A hybrid structure with an isolated dielectric resonator (DR) and an equivalent air-dielectric DR is introduced by lifting the resonator from the ground plane. The hybrid structure is excited by a slot-fed mechanism to obtain a smooth transition between each resonant mode. The resonant modes of the isolat...

A frequency tunable ring dielectric resonator antenna is presented in the paper. Advantages of the proposed antenna design are the wide range of adjustments and increasing of the radiation efficiency. The basic antenna characteristics, and also analysis of dependencies of the antenna’s central operating frequency, voltage standing wave ratio and radiation pattern versus the relative position of...

A vertical-strip-fed dielectric resonator antenna exhibiting broadband circular polarization characteristics is presented. A broad 3 dB axial ratio bandwidth (ARBW) is achieved by combining multiple orthogonal modes due to the use of a special-shaped dielectric resonator. The proposed antenna is fabricated to evaluate its actual performance capabilities. The antenna exhibits a measured 3 dB ARB...

This paper presents the design of a wideband circularly polarized antenna using a multiple-circular-sector dielectric resonator (DR). The DR is composed of twelve circular-sector DRs with identical central angles of 30 ∘ but with different radii. A genetic algorithm is utilized to optimize the radii of the twelve circular-sector DRs to realize wideband circular polarization. The proposed antenn...

A Dielectric Resonator loaded Substrate integrated waveguide cavity backed slot antenna (SIDRA) is proposed for two slot polarizations and orientation. A SIW-fed cylindrical DRA using rectangular slot is used for obtaining bandwidth of about 5% at 6.15 GHz. For enhancing bandwidth, a plus shaped slot with bandwidth of about 8.80% and gain of 3.7 dB is proposed. The proposed antenna represents S...

A new design of Dielectric Resonator Antenna (DRA) for mobile handsets is presented: the off-centre ring dielectric resonator antenna (OCRDRA). This achieved 15.9% impedance bandwidth (for S11 < -10 dB) by using high dielectric constant material (εr = 77) with coaxial probe feed. The geometry of the antenna is small, having key dimensions of the order of λo/10. Different inner diameters were te...