Application of Dielectric Resonators in Microwave Components

Plourde, J.K.; Ren, Chung-Li

doi:10.1109/tmtt.1981.1130444

Cited by 237 publications

(48 citation statements)

References 79 publications

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“…If , then , and if , then . With these small argument approximations in which both layers are electrically thin, the field in the air medium is given by (5) It is evident that for , the only way for there to be a zero of close to the interface is when . Also note that there is no -dependence on the electric field when and are both small.…”

Section: Analytical Formulationmentioning

confidence: 99%

“…This effect relies on a specific dispersion relation that requires one of the slabs to have a negative permeability. Conventional cavity resonators are made to be compact by loading them with a high dielectric constant material which reduces their Manuscript effective wavelength, and common techniques for this can be found in [3]- [5]. In contrast, this metamaterial approach can shrink the electrical size of the cavity smaller than half a wavelength.…”

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confidence: 99%

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The Measured Electric Field Spatial Distribution Within A Metamaterial Subwavelength Cavity Resonator

Hand

Cummer

Engheta

2007

IEEE Trans. Antennas Propagat.

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Through experimental investigation, a thin subwavelength cavity resonator was physically realized using a bilayer structure composed of air and a negative permeability metamaterial structure one unit cell in thickness. We designed and built the metamaterial slab with periodic metallic ring structures and measured the spatial electric field magnitude in a cavity formed from this slab and a region of air, showing that a subwavelength cavity can be realized. The measured electric field magnitude distribution in the cavity matched very well with effective medium theory, showing that even a slab one unit cell in thickness may be effectively equivalent to a thin homogeneous medium as far as the construction of a sub-wavelength cavity is concerned, provided that the unit cell size is significantly smaller than the free space wavelength. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Pennsylvania's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Abstract-Through experimental investigation, a thin subwavelength cavity resonator was physically realized using a bilayer structure composed of air and a negative permeability metamaterial structure one unit cell in thickness. We designed and built the metamaterial slab with periodic metallic ring structures and measured the spatial electric field magnitude in a cavity formed from this slab and a region of air, showing that a subwavelength cavity can be realized. The measured electric field magnitude distribution in the cavity matched very well with effective medium theory, showing that even a slab one unit cell in thickness may be effectively equivalent to a thin homogeneous medium as far as the construction of a sub-wavelength cavity is concerned, provided that the unit cell size is significantly smaller than the free space wavelength.Index Terms-Cavity resonator, metamaterials, microwave cavities, negative index of refraction, negative permeability.

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Section: Analytical Formulationmentioning

confidence: 99%

mentioning

confidence: 99%

The Measured Electric Field Spatial Distribution Within A Metamaterial Subwavelength Cavity Resonator

Hand

Cummer

Engheta

2007

IEEE Trans. Antennas Propagat.

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“…Over the past few years' researchers were focusing on investigations of dielectric-resonator antenna (DRA) technology as an alternative to traditional antennas due to its high radiation efficiency, lightweight, small size, low profile and low dissipation loss [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Patch Loaded DRA for Broadband WLAN Applications

Sharma¹,

Khare²,

Srivastava³

et al. 2013

IJCA

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A wideband patch loaded dielectric resonator antenna (DRA) is discussed here. The rectangular ring shaped slot coupling is used to excite the proposed antenna. In this paper, rectangular ring shaped slot coupled DRA and patch loaded DRA is studied and compared. The combined effect of patch radiator with rectangular ring shaped slot coupled DRA, on the return loss is observed. Simulation is done using Ansoft HFSS which is based on finite element method. Simple DRA resonates at two frequencies centered at 2.25 GHz having return loss of -14.41 db and 4.61GHz with a return loss of -19.29db; The patch loaded DRA shows resonance at frequencies centered around 2.19GHz having return loss of -32.3db and 4.4GHz with a return loss of -29.18db.The patch loaded DRA is based on the multi resonance technique that combines the resonance of slot coupled dielectric resonator and micro strip patch antenna. The bandwidth achieved for simple DRA is 26.8 % while patch loaded DRA offers 44.1 %.As the patch loaded DRA has larger bandwidth, may be used for wideband WLAN applications like WiFi, Bluetooth, Wimax etc. General TermsBroadband, WLAN,antenna

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“…Because of this dense frequency spectrum it may become difficult to avoid interference between a desirable operating mode frequency and an undesirable one, leading to the well recognized problem of spurious modes [1]. Though the issue of improvements in spurious response of DRs has been studied for a long time, it still continues to attract attention [2,3].…”

Section: Introductionmentioning

confidence: 99%

Improved Spurious Free Performance of Multi-Layer Multipermittivity Dielectric Resonator in Mic Environment

Chaudhary¹,

Mishra²,

Srivastava

et al. 2011

PIER B

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Abstract-In this paper, a novel approach has been suggested to obtain an improved spurious-free window for dielectric resonator in microwave integrated circuit environment. In microwave integrated circuit environment, the dielectric resonator placed on a thin dielectric substrate gets located asymmetrically with respect to its shielding enclosure. A reduced separation in frequencies (mode separation) is one of a consequence of this asymmetry that may become a cause of spurious modes. This adverse influence of asymmetry is sought to be compensated by proposing a multi-layer multi-permittivity dielectric resonator structure with several layers of differing permittivity. The suggested approach takes advantage of the fact that the mode separation of a dielectric resonator configuration can be correlated to relevant resonance mode fields. By perturbing the resonance mode fields through the suggested multi-layer multi-permittivity approach, the adverse influence of asymmetry is found to reduce considerably over a comparative Conventional Ring dielectric resonator in microwave integrated circuit configuration. Still more improvement in mode separation are shown when the shape of the multi-layer multipermittivity ring dielectric resonator is further modified, suggesting a scope for optimization in present approach.

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Application of Dielectric Resonators in Microwave Components

Cited by 237 publications

References 79 publications

The Measured Electric Field Spatial Distribution Within A Metamaterial Subwavelength Cavity Resonator

The Measured Electric Field Spatial Distribution Within A Metamaterial Subwavelength Cavity Resonator

Patch Loaded DRA for Broadband WLAN Applications

Improved Spurious Free Performance of Multi-Layer Multipermittivity Dielectric Resonator in Mic Environment

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