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Proceedings ArticleDOI

The influence of the dielectric constant in dielectric resonator antennas

09 Jun 2016-pp 111-114
TL;DR: In HFSS software program, the simulations are up to compare the antennas' behavior as a function of different parameters, such as: center frequency, gain, frequency bandwidth etc.
Abstract: This paper presents a comparison between dielectric resonator antennas with different dielectric constant parameter of the resonator. The antenna is fed with microstrip line. The dielectric resonators have cylindrical geometry. In HFSS software program, the simulations are up to compare the antennas' behavior as a function of different parameters, such as: center frequency, gain, frequency bandwidth etc.
References
More filters
Book
01 Jun 1986

1,346 citations

Book ChapterDOI
15 Apr 2005
TL;DR: Linearly and circularly polarized conformal strip-fed dielectric resonator antennas (DRAs) are studied in this article, where a parasitic patch is used to excite a nearly degenerate mode.
Abstract: Linearly and circularly polarized conformal strip-fed dielectric resonator antennas (DRAs) are studied in this article. In the latter case, a parasitic patch is used to excite a nearly degenerate mode. The hemispherical DRA, excited in its fundamental broadside TE111 mode, is used for the demonstration. In the analysis, the mode-matching method is used to obtain the Green's functions, whereas the method of moments is used to solve for the unknown strip currents. In order to solve the singularity problem of the Green's functions, a recurrence technique is used to evaluate the impedance integrals. This greatly increases the numerical efficiency. Measurements were carried out to verify the calculations, with good results. Keywords: circularly polarized antenna; dielectric antennas; mode-matching methods; moment methods; parasitic antennas; resonance

898 citations


"The influence of the dielectric con..." refers background in this paper

  • ...Assuming that the surfaces are perfect magnetic conductors, the below formula calculates the center frequency [4]:...

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Proceedings Article
01 Jan 1988
TL;DR: In this article, the design procedures used to characterize dielectric resonators and their applications in the millimeter-wave frequency band are discussed, focusing on low noise, small size, low cost and high temperature stability.
Abstract: Microwave passive and active devices containing dielectric resonators and the design procedures used to characterize these components are reviewed. The emphasis has been on low noise, small size, low cost and high temperature stability. Both filter and oscillator applications are described. The applications of dielectric resonators in the millimeter-wave frequency band are also discussed. >

452 citations


"The influence of the dielectric con..." refers methods in this paper

  • ...The most used methods to excite a DRA are: probe coupling, aperture coupling, and microstrip line coupling [3]....

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Journal ArticleDOI
TL;DR: In this paper, the authors used HFSS simulations to identify some of the superior modes that appear in cylindrical DRAs situated on a conductor ground plane and excited by a symmetric rectangular slot made in the ground plane.
Abstract: High permittivity materials allow good miniaturization of microwave components, but the dielectric resonator antenna using these materials has the drawback of a reduced bandwidth. To overcome this disadvantage we wanted to obtain a relatively wideband high permittivity DRA using the superior modes. Using HFSS simulations, we identified some of the superior modes that appear in cylindrical DRAs situated on a conductor ground plane and excited by a symmetric rectangular slot made in the ground plane. We identified seven superior modes and, for all of them, the measured and theoretically calculated resonant frequencies did not differ by more than 6%. Knowing the possible excited modes in the antenna and the relations for their resonant frequencies, one can predict the operating frequencies of a cylindrical DRA excited by a central rectangular slot.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used a bistatic stepped-frequency continuous-wave spiral-antenna system for the detection of landmines using both synthetic and experimental data.
Abstract: Images of the subsurface are made for the detection of land-mines using a bistatic steppedfrequency continuous-wave spiral-antenna system. While the system moves along the surface, the emitted electromagnetic wavefields are scattered by objects in the subsurface and cause changes in the voltages measured at the receiver. These changes are formulated as a convolution of a sensitivity function and a complex contrast function. Within the Born approximation, this sensitivity function is equal to the inner product of the wavefield emitted by the transmitter and the field from the receiver operating in transmitting mode. For true amplitude imaging purposes, knowledge of the wavefields in the subsurface is needed. Since it is difficult to obtain a model which describes the radiation characteristics accurately, we measure the footprints of the antennae at one level in the near-field region and propagate the emitted wavefields using Huygens’ principle. We use both synthetic and experimental data to localize objects in a homogeneous space. First, we apply time-domain synthetic-aperture-radar (SAR) imaging in its most basic appearance. Next, we apply a single-step inversion algorithm to the data, where we use the measured radiation characteristics of the antenna system. This results in an increase in resolution.We refer to this method as ‘minimized back-propagation’.

13 citations


"The influence of the dielectric con..." refers background in this paper

  • ...This aspect makes them appropriate for radar and subsurface sensing applications [7, 8]....

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