Analysis of a broadband slot‐coupled dielectric‐coated hemispherical dielectric resonator antenna

Chen, Nan-Cheng; Su, Hsin-Cheng; Leung, Kam Lun

doi:10.1002/mop.4650080105

Cited by 26 publications

(17 citation statements)

References 5 publications

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“…It is clearly seen that the resonant frequency decreases profusely with increasing slot length. This result is similar to that of linear slot-coupled DRAs [7], and has the advantage of tuning the CP resonant frequency by changing the slot radius. For a closed annular slot [2,6], the resonant frequency is mainly decided by the chosen DR element rather than the slot radius.…”

Section: Antenna Design and Experimental Resultssupporting

confidence: 76%

Frequency‐adjustable circularly polarized dielectric resonator antenna

Huang

Kuo

2002

Micro & Optical Tech Letters

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energy of each pair, respectively, is 1 ϭ66 mJ, 2 ϭ 71 mJ, and ϭ 1 ϩ 2 ϭ 137 mJ; when two sets of electrode-pairs are triggered synchronously, the output energy is 0 ϭ 180 mJ. The relative energy increase can be worked out as R ϭ 0 Ϫ ϭ 31.4%, and the corresponding the theoretical value is 37.3% with T ϭ 0.2 and A ϭ 0.10.The theoretical value is in agreement with the experimental results.Comparing the experimental results of the above two examples with the respective theoretical values, shows that the experimental value is always a little lower than the theoretical value. Possible reasons are the nonuniform gas discharge in practical operation and the fact that the intracavity photons cannot operate fully in the very short pulse time.Experiments also showed that the output energy of the second electrode-pair set (B) 2 is also slightly higher than the output energy of the first electrode-pair set (A) 1 , and the output energy of the third electrode-pair set (C) 3 is also slightly higher than the output energy of the second electrode-pair set (B) 2 . This may be because under the condition of delay trigger, when the second set of electrode-pair begins to operate after the former pulse ends, there are still some photons present. This leads to the gain threshold condition of the later electrode-pair set being slightly better than that of the former electrode-pair set, thereby increasing the output energy.ABSTRACT: Design of a microstrip-line-feed slot-coupled cylindrical dielectric resonator antenna (DRA) for circular polarization (CP) is investigated experimentally. The occurrence of the two orthogonal neardegenerate resonant modes is mainly excited by a perturbed annular slot that is, a C-shaped slot. The CP resonant frequency can be adjusted by using different slot sizes. Experimental results of the proposed C-slot coupled DRA are presented and discussed.ABSTRACT: A new coplanar coupled waveguide (CCPW) with cylindrical shielding is analyzed with the use of conformal mapping, which can provide accurate and fast calculations. Closed-form expressions for odd-and even-mode capacitances per unit length and characteristic impedances are derived. Numerical results are provided. The accuracy of the closed-form expressions has been confirmed by comparison with results available in the literature for CCPW with planar and rectangular shielded structure.

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Section: Antenna Design and Experimental Resultssupporting

confidence: 76%

Frequency‐adjustable circularly polarized dielectric resonator antenna

Huang

Kuo

2002

Micro & Optical Tech Letters

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“…It should also be noted that though the present technique can only be applied to DRAs of hemispherical shapes, other feed types to the single-layer or multilayer hemispherical DRA structures can be efficiently analyzed using this technique. This includes the fast and efficient computation of input impedance for the case of a coaxial probe coupled single layer hemispherical DRA [3] and the coaxial probe or microstrip slot-coupled multilayer hemispherical DRAs [7]- [10].…”

Section: Numerical Resultsmentioning

confidence: 99%

Efficient Technique for the Analysis of Microstrip Slot Coupled Hemispherical Dielectric Resonator Antenna

Kakade

Ghosh

2008

Antennas Wirel. Propag. Lett.

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In this letter, a novel method for the numerical evaluation of the Green's function for the microstrip slot coupled hemispherical dielectric resonator is presented. The proposed technique is very fast as compared to the conventional method of fourfold integration. In this technique, the homogeneous part of the dielectric resonator antenna (DRA) Green's function is manipulated in such a manner that its source and field terms are expressed in the absolute product form. Then, using method of moments (MoM), the absolute product form is numerically integrated by the product of two double integrations. The input impedance calculation using the proposed technique is almost 48 times faster than conventional technique. The method is very rigorous and general and should find applications in the other hemispherical DRA configurations.Index Terms-Dielectric resonator antenna (DRA), method of moments (MOM), microstrip slot, piecewise sinusoidal (PWS) basis.

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“…By again assuming the narrow slot condition, expanding the unknown equivalent magnetic current in the slot using PWS basis functions, and following the reciprocity theorem and the moment-method formulation described in [4], the input impedance, referenced at the slot position, of the DR antenna can be derived as where the spectral-domain Green's function Gyy") is interpreted and given in [4]. From Eqs.…”

Section: Formulation Of the Hemispherical Dr Antennamentioning

confidence: 99%

“…Although this theoretical approach seems less rigorous than an actual full-wave approach [3], the obtained theoretical results show good agreement with the measurement [l]. This theoretical approach can also be applied to other slotrelated geometries, such as the slot-coupled patch antenna [ l ] and the slot-coupled dielectric resonator (DR) antenna [4]. To analyze more applications of this theoretical approach, a general case of an inclined printed slot (see Figure 1) is treated in this article.…”

Section: Introductionmentioning

confidence: 98%

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Input impedance of inclined printed slot antennas and inclined-slot-coupled dielectric resonator antennas

Chen

Leung

1996

Microw. Opt. Technol. Lett.

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As an example, the dual-reflector antennas of spheroidal wave function distribution and uniform distribution have been used. For spheroidal wave function distribution, we have obtained transmission efficiency of nearly 95%, whereas for the uniform distribution, only 80% has been obtained. CONCLUSIONPrinciples of geometrical optics are used to design dualreflector antennas with nonuniform amplitude and phase distributions, which can achieve maximum power transfer. Such antenna systems have value in the field of materials metrology, especially for dielectric measurements, and where maximum power transfer is required. ABSTRACT The theoretical approach based on a combination of the reciprocity theorem and a moment-method calculation has been applied in the analysis of an inclined printed slot antenna and an inclined-slot-coupled dielectric resonator antenna. The input impedance of the antenna is formulated and calculated. The obtained theoretical results are found to be in good agreement with the experimental data. This theoretical method is good for solving the inclined printed slot and inclined-slot related problems. 0 1996 John W i l e y ABSTRACT The purpose of this communication is to discuss the effect of the mutual coupling between element arrays on the radiation pattern, and to compensate for this effect in introducing them into a power far-jield pattern synthesis array. The synthesized pattern is an optimum approximation to the prescribed power pattern in the minmax sense. A study is realized for shaped seciarian and cosecant beams. 0 1996 John Wiley & Sons, Inc.

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Analysis of a broadband slot‐coupled dielectric‐coated hemispherical dielectric resonator antenna

Cited by 26 publications

References 5 publications

Frequency‐adjustable circularly polarized dielectric resonator antenna

Frequency‐adjustable circularly polarized dielectric resonator antenna

Efficient Technique for the Analysis of Microstrip Slot Coupled Hemispherical Dielectric Resonator Antenna

Input impedance of inclined printed slot antennas and inclined-slot-coupled dielectric resonator antennas

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