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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29 Oct 2002
TL;DR: In this paper, a tunable superconductor resonator is described, which is adjustable to a first resonant and a second resonant frequency by electrically coupling a variable capacitance portion to the resonator coil.
Abstract: A tunable superconductor resonator including a superconductor resonator coil and a variable capacitance portion. The superconductor resonator is adjustable to a first resonant frequency and a second resonant frequency. A variable capacitance portion is electrically coupled to the superconductor resonator coil to vary electrical capacitance between a first capacitance and a second capacitance. The variable capacitance portion providing the first capacitance adjusts the superconductor resonator to its first resonant frequency. The variable capacitance portion providing the second capacitance adjusts the superconductor resonator to its second resonant frequency. Different aspects of the tunable superconductor resonator can be tuned using dynamic tuning and/or static tuning techniques.
73 citations
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TL;DR: In this article, a dielectric resonator antenna with waveguide slots is proposed as an alternative to traditionally used excitation mechanisms in order to enhance the frequency bandwidth of slotted waveguide radiators.
Abstract: Excitation of dielectric resonator antennas (DRAs) by waveguide slots is proposed as an alternative to traditionally used excitation mechanisms in order to enhance the frequency bandwidth of slotted waveguide radiators and to control the power coupled to the DRA. The analysis is based on the numerical solution of coupled integral equations discretized using the method of moments (MoM). The dielectric resonator (DR) is modeled as a body-of-revolution based on the integral equation formulation for the equivalent electric and magnetic surface current densities. The analysis of an infinite or a semi-infinite waveguide containing longitudinal or transverse narrow slots uses the appropriate dyadic Green's function resulting in closed-form analytical expressions of the MoM matrix. The scattering parameters for a slotted waveguide loaded with a dielectric resonator antenna disk are calculated and compared with finite-difference time-domain results. Bandwidth enhancement is achieved by the proper selection for the antenna parameters.
72 citations
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22 Jul 2010TL;DR: In this paper, a dielectric resonator antenna is described that includes a multi-layer substrate on which a plurality of insulating layers and conductor layers are alternately stacked.
Abstract: A dielectric resonator antenna is disclosed that includes a multi-layer substrate on which a plurality of insulating layers and conductor layers are alternately stacked. The dielectric resonator antenna also includes a first conductor plate that has an opening part on the upper portion of the top insulating layer of the multi-layer substrate and a second conductor plate that is formed on the lower portion of the bottom insulating layer from the first conductor plate. The insulating layer is formed with at least two stacked layers and is disposed at a position corresponding to the opening part. The dielectric resonator antenna also includes a plurality of first metal via holes, a feeding part and a matching substrate that is stacked on the opening part and is stacked with at least one insulating layer.
72 citations
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02 Apr 2007TL;DR: An acoustic resonator assembly includes a layer of high-acoustic-impedance material and a layer made of a low-electrical-permittivity material as mentioned in this paper, which may support the resonator over an interconnect layer or act as a decoupling assembly between two active elements.
Abstract: An acoustic resonator assembly includes a layer of high-acoustic-impedance material and a layer of low-acoustic-impedance material made of a low-electrical-permittivity material. This assembly may support the resonator over an interconnect layer or act as a decoupling assembly between two active elements of the resonator. The assembly may alternatively include three low-acoustic impedance layers. Alternatively, the assembly may include three acoustic impedance layers wherein two of the layers are low acoustic impedance layers and the third layer has a higher acoustic impedance than the first two or alternatively is a high-acoustic impedance layer.
72 citations
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TL;DR: In this article, a compact quasi-isotropic dielectric resonator antenna (DRA) with filtering response is investigated in a communication. But the authors only evaluated the performance of the DRA at 2.4 GHz.
Abstract: A compact quasi-isotropic dielectric resonator (DR) antenna (DRA) with filtering response is first investigated in this communication. The cylindrical DRA is fed by a microstrip-coupled slot, exciting in its ${\text {HEM}}_{11 \delta }$ mode which radiates like a magnetic dipole. A small ground plane is used for this DRA and it radiates like an electric dipole. The combination of the two orthogonal dipoles leads to a quasi-isotropic radiation pattern, with gain deviation as low as 5.8 dB in the 360° full space. To integrate the filtering function, the microstrip feed-line and the ground plane are turned upside down, and further two stubs with different lengths are used together to excite the DR. Due to the different loading effects of the feeding stubs, two resonances of the DR ${\text {HEM}}_{11 \delta }$ mode are excited in the passband, effectively enhancing the bandwidth of DRA ( $\varepsilon _{r} = 20$ ) to 7%. Furthermore, two controllable radiation nulls are generated by the DR loaded microstrip feed-line, bringing about high frequency selectivity at the edges of the passband and a quasi-elliptic bandpass response. For demonstration, a prototype operating at 2.4 GHz was fabricated and tested; reasonable agreement is obtained between the simulated and measured results.
72 citations