The characteristics of the dipole espar antenna using the cross‐coplanar waveguide feed

Park, Jaesung; Lee, Seung Hwan; Choi, Hak-Keun

doi:10.1002/mop.29319

Cited by 5 publications

(9 citation statements)

References 10 publications

(12 reference statements)

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“…In Ref. 6, we initially presented an optically controlled CdSpolymer metal insulator metal (MIM) capacitor where a change of its capacitance could be achieved when illuminated. In that preliminary work, the large loss tangent of the CdS-polymer mixture together with the poor high frequency conductivity of the optically transparent metal ITO electrodes made that capacitor unsuitable for microwave applications.…”

Section: Resultsmentioning

confidence: 99%

Design of broadband double‐curved cross dipole ESPAR antennas

Kyaw

Choi

2016

Micro & Optical Tech Letters

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The design of a broadband ESPAR (electrically steerable passive array radiator) antenna for broadband modern communication systems is proposed in this article. A compact broadband cross dipole ESPAR antenna comprises of single active element with cross type and six parasitic elements with cylindrical type. The cross dipole of active element modified with double-curved each radius. Reactance devices are loaded on each parasitic element to control radiation pattern. It satisfied return loss less than 210 dB from bandwidth 2.35 GHz and 2.48 GHz. The radiation patterns are in the same direction and gain has each 4.5 dBi, 4.6 dBi, and 5.3 dBi at resonant frequencies 2.35 GHz, 2.42 GHz, and 2.48 GHz, respectively.ABSTRACT: A new optically tunable low-pass filter (LPF) is presented with a cutoff frequency ranging from 13.71 GHz to 14.79 GHz. Tunability is achieved based on a novel metal insulator metal (MIM) capacitor having a photorefractive insulator that shows 13% change in capacitance. The LPF has been fabricated and measured, and a simple lumped element model extracted to analyze its behavior. The improved meshed MIM capacitor employed in the LPF marks a practical demonstration of an optically tuned filter.

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Section: Resultsmentioning

confidence: 99%

Design of broadband double‐curved cross dipole ESPAR antennas

Kyaw

Choi

2016

Micro & Optical Tech Letters

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“…Active elements used in the existing ESPAR antenna include a circular dipole antenna and cross CPW antenna …”

Section: Active Element Of Espar Antennamentioning

confidence: 99%

“…Active elements used in the existing ESPAR antenna include a circular dipole antenna and cross CPW antenna. 6,7 These active elements exhibit the drawback of low gain due to their structural characteristics. Figure 2B shows the active element proposed to improve on this drawback.…”

Section: A Cti Ve E Lem Ent O F E S P Ar An Tenn Amentioning

confidence: 99%

Characteristics of high‐gain ESPAR antenna using collinear dipole array

Lee

Choi

2018

Micro & Optical Tech Letters

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In this study, a high‐gain electrically steerable parasitic array radiator (ESPAR) antenna using a collinear dipole array as a feed element is proposed, and its radiation characteristic is discussed. The feed element of the proposed antenna has a higher gain than existing ESPAR antennas, and it makes impedance matching easier via a length of coaxial cable between the arrayed feed elements and the thickness of the dielectric, using a collinear dipole array of circular dipole antennas. The proposed antenna is structured with feed elements of two‐layer collinear circular dipole arrays surrounded by four parasitic elements with an array radius of λ/16. The variable directional radiation pattern and high‐gain characteristic can be achieved through changes in reactance between the parasitic elements. The gain of the proposed antenna is 7.2 dBi approximately at the center frequency, and the return loss is less than −15 dB at the used frequencies of 2.4–2.5 GHz.

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“…The concept of ESPAR has been adopted in designing phase array antenna . In recent years, different topologies have been proposed to improve the performance of the ESPAR antenna . A simple control circuitry for ESPAR antenna was proposed in .…”

Section: Introductionmentioning

confidence: 99%

“…A simple control circuitry for ESPAR antenna was proposed in . The cross coplanar waveguide feed has been adopted in to achieve more rigidness in ESPAR antenna configuration. Annular ring slot active element was used in ESPAR antenna to introduce better topology for impedance matching .…”

Section: Introductionmentioning

confidence: 99%