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.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a wideband stair-shaped dielectric resonator antenna (DRAs) is designed with one-step or two-steps stair geometries for the X-band.
Abstract: Wideband stair-shaped dielectric resonator antenna (DRAs) are designed. Wide bandwidths are achieved with one-step or two-steps stair geometries. Cricular and square cross-sections are discussed with two different excitation methods: coaxial feed and aperture coupled. The DRAs are designed in the X-band. An impedance bandwidth (S 11 <-10 dB) of 54.3% is obtained with the two-steps stair-shaped DRA. The antennas have broadside radiation patterns in all cases across the matching band. In addition, embedding the base into another dielectric material reduces the size of the stair-shaped DRA. Simulation results are compared with measurements and reasonable agreement is obtained
91 citations
Patent•
14 Sep 1992
TL;DR: In this paper, a metal microstrip dipole resonator was used to measure the dielectric and conductive properties of solids, liquids, or gasses at microwave frequencies.
Abstract: A highly sensitive, direct-contact, in situ sensor for nondestructively measuring or monitoring the complex dielectric and conductive properties of solids, liquids, or gasses at microwave frequencies. A metal microstrip dipole resonator (11) is etched on the surface of a dielectric substrate (12) which is bonded to a copper ground plane (14). The dipole resonator is electromagnetically driven by mutual inductive coupling to a short nonresonant feed slot (13) formed in the ground plane (14). The slot (13) is driven by a coaxial feed line (7) or a microstrip feed line (16) extending from a swept microwave frequency source (2) which excites the incident wave (17). Alternatively, the metal resonator is omitted and the length of the slot (15) is increased so that it becomes the resonator. In use, the sensor is placed in close physical contact with the test material (9) having complex dielectric constant e* (=e'-je") or conductivity σ. As the frequency of the microwave source (2) is swept, a sharp dip in the reflected wave (18) occurs at the resonant frequency, provided that the coaxial feed line (7) or microstrip feed line (16) is nearly critically coupled to the sensor input. Measurement of the resonant frequency and input coupling factor determines small changes in e', e" and σ with great resolution. To diminish the electromagnetic coupling between the resonator (11) and the test material (9), and to protect the resonator (11) from damage and wear, a superstrate (26) may be added.
91 citations
Patent•
18 Sep 2003TL;DR: In this paper, the authors proposed a connection of coupled BAW resonators in the serial branch of a filter circuit with another resonator or resonator stack in the parallel branch of the filter circuit.
Abstract: The invention relates to a resonator operating with bulk acoustic waves (BAW resonator, BAW=Bulk Acoustic Wave) and band-pass filters constructed of such resonators. To increase the edge steepness of the transmission band of a BAW band-pass filter, the invention proposes reducing the effective coupling of a BAW resonator by using the connection in parallel of a BAW resonator and a capacitor instead of only one resonator. In addition, to increase the edge steepness of the transmission band, the use of a connection of coupled BAW resonators in the serial branch of a filter circuit with another resonator or resonator stack in the parallel branch of the filter circuit is proposed, the additional resonator or resonator stack being connected to the center electrode of the resonator stack specified initially.
90 citations
TL;DR: In this paper, a new type of microstrip quarter-wavelength stepped-impedance resonator (SIR) filter with controllable mixed electric and magnetic coupling is proposed.
Abstract: This letter proposes a new type of microstrip quarter-wavelength stepped-impedance resonator (SIR) filter with controllable mixed electric and magnetic coupling. A conducting pin and an open gap between two coupled SIRs are jointly used to create the mixed coupling, and the electric and magnetic coupling can be separately controlled by adjusting the spacing between the gap and the position of the conducting pin. Based on the proposed structure, a second-order filter and a third-order filter are designed and fabricated. Good agreement between the measured and simulated data is obtained.
90 citations
TL;DR: In this paper, a probe-fed hemispherical dielectric resonator antenna with an air gap between the dielectrics and the ground plane is investigated theoretically by using a Green's function formulation, and it is found that with the presence of the airgap, the antenna bandwidth, obtained from the 3dB impedance bandwidth, can be considerably enhanced.
Abstract: A probe-fed hemispherical dielectric resonator antenna with an airgap of hemispherical shape between the dielectric and the ground plane is investigated theoretically by using a Green's function formulation. Input impedance of the efficiently radiating mode of TE/sub 111/ is calculated and analyzed. It is found that, with the presence of the airgap, the antenna bandwidth, obtained from the 3-dB impedance bandwidth, can be considerably enhanced. This study provides a new design for bandwidth enhancement of the dielectric resonator antenna. >
90 citations