Computed Modal Field Distributions of Isolated Dielectric Resonators

Kajfez, D.; Glisson, A.W.; James, J.R.

doi:10.1109/mwsym.1984.1131876

Cited by 87 publications

(126 citation statements)

References 2 publications

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“…Figure 4 displays E-field variation on the ring DRA at 3.0 GHz and 5.8 GHz, respectively. From Figure 4, it is confirmed that HEM 11δ and HEM 12δ modes are created inside the ring DRA at 3.0 GHz and 5.8 GHz, respectively [23]. This can also be confirmed by the following mathematical formulation [24]: …”

Section: Dual Band Generationsupporting

confidence: 57%

Investigation on Circularly Polarized Ring Dielectric Resonator Antenna for Dual-Band Wireless Applications

Pathak¹,

Sharma²,

Kushwah³

2017

PIER M

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Abstract-In this article, design and analysis of a dual-band ring dielectric resonator based radiator with circular polarization features is explored. The presented ring DRA is excited with the help of a tilted modified square-shaped aperture. Two important attractive features of the present article are: (i) two radiating modes originated inside the ring DRA, i.e., HEM 11δ and HEM 12δ mode; (ii) tilted modified square aperture generates circular polarized (CP) wave in both the operating frequency bands. For verifying the simulated results, practical model of the proposed antenna has been fabricated and verified. Experimental outcomes display that the proposed radiator functions over dual frequency bands, i.e., 2.8-3.58 GHz and 5.5-5.92 GHz respectively. 3-dB axial ratio (AR) frequency ranges of the proposed radiator are 2.8-3.2 GHz and 5.85-6.0 GHz, respectively. These appearances make it appropriate for some important wireless applications such as wireless LAN (2.4/5.2 GHz) and WiMAX (2.5 GHz) applications.

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Section: Dual Band Generationsupporting

confidence: 57%

Investigation on Circularly Polarized Ring Dielectric Resonator Antenna for Dual-Band Wireless Applications

Pathak¹,

Sharma²,

Kushwah³

2017

PIER M

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“…been studied by various authors [21]- [23], [24]- [30], only a brief summary of the basic theory will be given here.…”

Section: B Surface Integral Equation and Mommentioning

confidence: 99%

“…These equivalent surface currents are related to the total tangential magnetic and electric field by and respectively, where the upper sign holds for the exterior and the lower sign for the interior region. Coupled integral equations (13a) (13b) for the surface currents are obtained by satisfying the boundary conditions at the interface [27]- [30], where represent the tangential components of the incident field. Herein the electric and magnetic vector and scalar potentials are defined as…”

Section: B Surface Integral Equation and Mommentioning

confidence: 99%

“…For purely imaginary frequencies, the wavenumber is real. Assuming real permeabilities and a highly conducting target from the theory of cavities or dielectric resonators [37], [28]- [30], the product of the real resonant wavenumber and a characteristic dimension of the object does not change for a given shape. This results in (20)…”

Section: B Surface Integral Equation and Mommentioning

confidence: 99%

“…After using circuit theory to explain the basic wave phenomenology, numerical damping coefficients and currents are computed for the special case of conducting, permeable BOR's. While such analyses have been applied to the case of scattering from perfectly conducting and lowloss dielectric BOR's [21]- [24], [25]- [30], its application to calculation of natural modes for highly (but not perfectly) conducting, permeable targets is new. To validate the accuracy of the numerical data, comparisons are made with measured data [31]- [32] for several variations in material properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the low-frequency natural response of conducting and permeable targets

Geng

Baum

Carin

1999

IEEE Trans. Geosci. Remote Sensing

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Abstract-The low-frequency natural response of conducting, permeable targets is investigated. We demonstrate that the source-free response is characterized by a sum of nearly purely damped exponentials, with the damping constants strongly dependent on the target shape, conductivity, and permeability, thereby representing a potential tool for pulsed electromagnetic induction (EMI) identification (discrimination) of conducting and permeable targets. This general concept is then specialized to the particular case of a body of revolution (BOR), for which the Method-of-Moments (MoM)-computed natural damping constants from several targets are compared with measurements. Moreover, theoretical natural (equivalent) surface currents and damping coefficients are shown for other targets of interest. Finally, we investigate the practical use of such natural signatures in the context of identification, wherein Cramer-Rao bound (CRB) studies address signal-to-noise ratio (SNR) considerations.

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Rotating algal biofilm reactor and spool harvester for wastewater treatment with biofuels by‐products

Christenson

Sims

2012

Biotech & Bioengineering

334

219

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Maximizing algae production in a wastewater treatment process can aid in the reduction of soluble nitrogen and phosphorus concentrations in the wastewater. If harvested, the algae-based biomass offers the added benefit as feedstock for the production of biofuels and bioproducts. However, difficulties in harvesting, concentrating, and dewatering the algae-based biomass have limited the development of an economically feasible treatment and production process. When algae-based biomass is grown as a surface attached biofilm as opposed to a suspended culture, the biomass is naturally concentrated and more easily harvested. This can lead to less expensive removal of the biomass from wastewater, and less expensive downstream processing in the production of biofuels and bioproducts. In this study, a novel rotating algal biofilm reactor (RABR) was designed, built, and tested at bench (8 L), medium (535 L), and pilot (8,000 L) scales. The RABR was designed to operate in the photoautotrophic conditions of open tertiary wastewater treatment, producing mixed culture biofilms made up of algae and bacteria. Growth substrata were evaluated for attachment and biofilm formation, and an effective substratum was discovered. The RABR achieved effective nutrient reduction, with average removal rates of 2.1 and 14.1 g m(-2) day(-1) for total dissolved phosphorus and total dissolved nitrogen, respectively. Biomass production ranged from 5.5 g m(-2) day(-1) at bench scale to as high as 31 g m(-2) day(-1) at pilot scale. An efficient spool harvesting technique was also developed at bench and medium scales to obtain a concentrated product (12-16% solids) suitable for further processing in the production of biofuels and bioproducts.

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Computed Modal Field Distributions of Isolated Dielectric Resonators

Abstract: Equivalentsurface currents obtained from

Cited by 87 publications

References 2 publications

Investigation on Circularly Polarized Ring Dielectric Resonator Antenna for Dual-Band Wireless Applications

Investigation on Circularly Polarized Ring Dielectric Resonator Antenna for Dual-Band Wireless Applications

On the low-frequency natural response of conducting and permeable targets

Rotating algal biofilm reactor and spool harvester for wastewater treatment with biofuels by‐products

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