Abstract
A simple wide-band rectangular dielectric resonator antenna (DRA) is designed for the X-band and Ku-band applications. The DRA is excited by a vertical strip placed on the middle of the DRA wide side wall through a coaxial probe attached to a finite size ground plane. Good agreement between measured and simulated results is obtained. The measured 10 dB return loss bandwidth of the antenna is about 7.8 GHz (63%). The simulated gain of the antenna is 6.1 dBi at 12 GHz. The antenna excites undesired modes that perturb the radiation patterns and increase the cross-polarization level. The dielectric resonator is wrapped by a conducting strip to suppress some modes and improve the radiation characteristics of the antenna. Adding the strip reduces the cross polarization level and improves the co-polarization radiation pattern.
Highlights
Dielectric resonator antennas (DRAs) have recently been investigated and found to be efficient radiators
In order to excite the DRA [13], different techniques have been used, such as probe feeding, in which the probe can be placed adjacent to the DRA [14]; an aperture-coupled dielectric resonator antenna using a strip-line feed [15]; an aperture-fed DRA using a dielectric image guide [16]; and direct coupling using a dielectric image guide [17]
In the radiation pattern at 12 GHz, there is a null at about 55°
Summary
Dielectric resonator antennas (DRAs) have recently been investigated and found to be efficient radiators. In order to excite the DRA [13], different techniques have been used, such as probe feeding, in which the probe can be placed adjacent to the DRA [14]; an aperture-coupled dielectric resonator antenna using a strip-line feed [15]; an aperture-fed DRA using a dielectric image guide [16]; and direct coupling using a dielectric image guide [17]. One method was to use stacked antennas of different sizes and/or dielectric materials [18], but this increases the size and cost of the antenna Another approach was to use specially shaped DRAs [7], but these are not easy to fabricate. Cross-polarization reduction is studied in Section 4, which is followed by the conclusion
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