Correction Due to a Finite Permittivity for a Ring Resonator in Free Space

Smedt, R. De

doi:10.1109/tmtt.1984.1132839

Cited by 35 publications

(14 citation statements)

References 12 publications

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“…Accurate results for the resonant frequency of the TEoll + & mode have also been given by DeSmedt [8]. Using these results, the following formula was obtained for the normalized wavenumber of the TE,)ll+B mode:…”

Section: Teo11+8mentioning

confidence: 90%

Dielectric resonator antennas—a review and general design relations for resonant frequency and bandwidth

Mongia

Bhartia

1994

Int. J. Microw. Mill.‐Wave Comput.‐Aided Eng.

809

478

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Open dielectric resonators (DRs) offer attractive features as antenna elements. These include their small size, mechanical simplicity, high radiation efficiency due to no inherent conductor loss, relatively large bandwidth, simple coupling schemes to nearly all commonly used transmission lines, and the advantage of obtaining different radiation characteristics using different modes of the resonator. In this article, we give a comprehensive review of the modes and the radiation characteristics of DRs of different shapes, such as cylindrical, cylindrical ring, spherical, and rectangular. Further, accurate closed form expressions are derived for the resonant frequencies, radiation Q-factors, and the inside fields of a cylindrical DR. These design expressions are valid over a wide range of D R parameters. Finally, the techniques used to feed DR antennas are discussed.

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Section: Teo11+8mentioning

confidence: 90%

Dielectric resonator antennas—a review and general design relations for resonant frequency and bandwidth

Mongia

Bhartia

1994

Int. J. Microw. Mill.‐Wave Comput.‐Aided Eng.

809

478

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“…In that case, the Q × f product should be independent of t/d and higher Q 's should be observed in thicker pellets where the resonance occurs at a lower frequency. It should be noted that refinements to the above equation are necessary for analysis of Q and f of pellets investigated over a wide range of frequency and aspect ratio, and for ring resonators 20,21 . However, for the range of frequency and aspect ratio of the samples explored in this investigation, the effect of these higher order corrections on the Q 's that we observed is less than 0.1%.…”

Section: Resultsmentioning

confidence: 78%

Influence of Non‐Stoichiometry on the Structure and Properties of Ba(Zn_1/3Nb_2/3)O₃ Microwave Dielectrics. IV. Tuning τ_f and the Part Size Dependence of Q×f

Davies

2006

Journal of the American Ceramic Society

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High Q ceramics of Ba3W2O9 (BW)‐substituted Ba(Zn1/3Nb2/3) O3 (BZN) were prepared with a zero τf through the partial substitution of Zn by Ni and Co. The small concentrations of B‐site vacancies introduced by the substitution of BW accelerated the kinetics and stability of the cation ordering and lowered the sintering temperature. Dense, zero τf, ordered solid solutions such as 0.99Ba(Zn0.3Co0.7)1/3Nb2/3O3–0.01BW with ɛr=34.4 and Q×f=82 000 at ∼8 GHz could be obtained after sintering at 1380°C for 5 h and annealing at 1300°C for 24 h. Partially ordered ceramics in the Zn/Co and Zn/Ni solid solutions show a large gradient in the ordering throughout the pellets, which produces a resonant frequency dependence of their Q×f value. The ordering gradient is associated with the increased constraints on the growth of the 1:2 ordered structure within the interior of larger and thicker pellets and can be minimized by extended annealing.

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“…The relative permittivity of the material ε r and the aspect ratio d / a are varied to observe how the bandwidth and radiation pattern of the DRA depend on these two parameters , while the slot length and stub length are optimized for each combination of permittivity and aspect ratio. The slot is centered at the origin of the DRA to maintain pattern symmetry and maximize the excitation of the dominant TM 110 mode, which is also referred to as the hybrid HEM 111 or HE 11δ mode in the literature.…”

Section: Introductionmentioning

confidence: 99%

A study of the impedance and pattern bandwidths of aperture‐coupled cylindrical dielectric resonator antennas

Huynh

Jackson

Long

et al. 2014

Micro & Optical Tech Letters

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A Q-band injection-locked frequency divider with inductive feedback for a locking range enhancement, IEEE Microwave Wireless Compon Lett 21 (2011), 317-319. 2. Y.-T. Chen, M.-W. Li, and T.-H. Huang, A V-band CMOS direct injection-locked frequency divider using forward body bias technology, IEEE Microwave Wireless Compon Lett 20 (2010), 396-398. 3. T.-N. Luo and Y.-J.E. Chen, A 0.8-mW 55-GHz dual-injection locked CMOS frequency divider, IEEE Trans Microwave Theory Tech 56 (2008), 620-625. 4. A. Katz, O. Degani, and E. Socher, Modeling and design of a lowpower injection-locked frequency divider in 90nm CMOS for 60GHz A 60-GHz 0.13-lm CMOS divide-by-three frequency divider, IEEE Microwave Theory Tech 56 (2008), 2409-2415. 7. Y. Chao and H.C. Luong, Analysis and design of a 2.9-mW 53.4-79.4-GHz frequency-tracking injection-locked frequency divider in 65-nm CMOS, IEEE J Solid-State Circuits 48 (2013), 2403-2418.ABSTRACT: Aperture-coupled cylindrical dielectric resonator antennas (DRAs) fed by a microstrip line are investigated by varying their aspect ratio and permittivity to maximize their impedance bandwidth, while maintaining an acceptable radiation pattern. Although the maximum impedance bandwidth attainable by an aperture-coupled DRA is comparable to that of a probe-fed one (40% vs. 45%), the maximum combined bandwidth (which also accounts for the pattern shape) is smaller-about 30% versus 45%. The study reveals a very important conclusion: while a probe feed is good for obtaining broadband DRAs that are tall or pencil-like, an aperture-coupled feed is more suitable for applications that require low-profile or pancake-like broadband DRAs.

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Correction Due to a Finite Permittivity for a Ring Resonator in Free Space

Cited by 35 publications

References 12 publications

Dielectric resonator antennas—a review and general design relations for resonant frequency and bandwidth

Dielectric resonator antennas—a review and general design relations for resonant frequency and bandwidth

Influence of Non‐Stoichiometry on the Structure and Properties of Ba(Zn_1/3Nb_2/3)O₃ Microwave Dielectrics. IV. Tuning τ_f and the Part Size Dependence of Q×f

A study of the impedance and pattern bandwidths of aperture‐coupled cylindrical dielectric resonator antennas

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Correction Due to a Finite Permittivity for a Ring Resonator in Free Space

Cited by 35 publications

References 12 publications

Dielectric resonator antennas—a review and general design relations for resonant frequency and bandwidth

Dielectric resonator antennas—a review and general design relations for resonant frequency and bandwidth

Influence of Non‐Stoichiometry on the Structure and Properties of Ba(Zn1/3Nb2/3)O3 Microwave Dielectrics. IV. Tuning τf and the Part Size Dependence of Q×f

A study of the impedance and pattern bandwidths of aperture‐coupled cylindrical dielectric resonator antennas

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Influence of Non‐Stoichiometry on the Structure and Properties of Ba(Zn_1/3Nb_2/3)O₃ Microwave Dielectrics. IV. Tuning τ_f and the Part Size Dependence of Q×f