Topic
Dielectric resonator antenna
About: Dielectric resonator antenna is a research topic. Over the lifetime, 8199 publications have been published within this topic receiving 111090 citations. The topic is also known as: DRA.
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TL;DR: In this paper, a low-cost and high-gain microstrip/dielectric resonator hybrid antenna was proposed for short-range millimeter-wave communication systems operating in the 57-65 GHz frequency band.
Abstract: A new low-cost and high-gain microstrip/dielectric resonator hybrid antenna is described for short-range millimeter-wave communication systems operating in the 57-65 GHz frequency band. The impedance bandwidth (VSWR < 2) of the proposed antenna is wide enough to entirely cover this portion of unlicensed spectrum (ap 5%). Furthermore, the measured high gain (11.9 plusmn 0.9 dB) is fairly constant across the operating band. A study of the electric and magnetic fields inside the hybrid structure concludes that the excitation of a higher-order mode inside the dielectric resonator (namely the HEM15delta hybrid mode) is responsible for the improved gain since the electrical size of the antenna is increased. In order to validate the proposed design, theoretical calculations and measurements from a fabricated prototype are provided.
83 citations
TL;DR: In this article, the authors proposed a cross-shaped dielectric resonator antenna (DRA) with separately fed broadside circularly polarized (CP) and omnidirectional linearly polarized (LP) radiation patterns.
Abstract: This letter proposes a multifunction cross-shaped dielectric resonator antenna (DRA) with separately fed broadside circularly polarized (CP) and omnidirectional linearly polarized (LP) radiation patterns. These distinct radiation patterns are achieved in overlapping frequency bands by exciting two different modes in a single dielectric resonator (DR) volume. This letter also investigates the effect of the feeding geometry on the mutual coupling between the modes and concludes that an asymmetric feeding degrades the orthogonality of the modes and thus increases the interport coupling coefficient. By using a symmetric feeding, the coupling coefficient can be significantly reduced to below - 30 dB in the frequency band common to both operation modes. The experimental results show a good agreement with simulation and demonstrate a broadside CP operation over a bandwidth of 6.8%, which overlaps with the omnidirectional LP impedance bandwidth of 38.5%. The proposed antenna could be used not only as multifunction, but also as polarization diversity antenna due to the overlapping dual-feed CP and LP operation.
82 citations
TL;DR: In this article, a 50-MHz DRA that uses water as the dielectric was presented, and an electronic technique for retuning the feed probe is also presented where varactor diodes are biased to provide a good impedance match across a range of approximately 50 to 100 MHz.
Abstract: Dielectric resonator antennas (DRAs) have in the past been used most often at frequencies in the GHz portion of the spectra. This letter presents a novel 50-MHz DRA that uses water as the dielectric. For purposes of keeping the antenna tuned to a specific frequency, ande for using the antenna at different frequencies, this antenna can utilize a pump to alter the level of water in the DRA, thus, altering its resonant frequency. An electronic technique for retuning the feed probe is also presented where varactor diodes are biased to provide a good impedance match across a range of approximately 50 to 100 MHz. These antennas may provide a compact solution at lower frequencies especially where a directional pattern may be required. The liquid dielectric not only provides frequency tuning but simple deployment and a reducible radar cross section.
82 citations
TL;DR: In this article, a new class of reconfigurable antenna based on monopole structures containing liquid dielectrics is presented, and it is determined that the operating principle of this class of antenna is essentially that of a dielectric resonator, where salt (in solution) modifies the Dielectric properties.
Abstract: A new class of reconfigurable antenna based on monopole structures containing liquid dielectrics is presented. It was determined that the operating principle of this class of antenna is essentially that of a dielectric resonator, where salt (in solution) modifies the dielectric properties. The resonator column height determined the operating frequency, allowing match and frequency of operation to be fully tunable over 1–2.5 GHz while salinity mainly influences the bandwidth.
82 citations
TL;DR: In this paper, an aperture-coupled equilateral-triangular dielectric resonator antenna (DRA) of very high permittivity was investigated experimentally.
Abstract: An aperture-coupled equilateral-triangular dielectric resonator antenna (DRA) of very high permittivity (/spl epsiv//sub r/=82) is investigated experimentally. The triangular DRA is more compact in size than rectangular and circular disk DRAs operating at the same frequency. The impedance matching, radiation patterns and antenna gain of the triangular DRA are presented.
81 citations