Near-Field Focused Array Microstrip Planar Antenna for Medical Applications

Tofigh, Farzad; Nourinia, Javad; Azarmanesh, Mohammad Naghi; Khazaei, Kayvan M.

doi:10.1109/lawp.2014.2322111

Cited by 98 publications

(54 citation statements)

References 15 publications

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“…where x i and y i are the coordinate of the i th element, z f is focal distance, and k = 2π/λ . It simplifies the antenna model and is applied extensively . The other method is based on maximum power transmission efficiency principle, which can be discussed earlier .…”

Section: Excitation Methodsmentioning

confidence: 99%

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An enhanced circular polarization near‐field focused antenna array by director patches

Huang

Wang

2018

Micro & Optical Tech Letters

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This paper presents an enhanced circular polarization (CP) near‐field focused (NFF) antenna array. There exist three advantages for the CP NFF antenna. First, this study provides an effective way to realize the CP and NFF simultaneously and do not need to design a specific patch shape for CP, which provides more freedom to change the patch shape for improving other performances. The effective way is arranging the element excitation according to maximum power transmission efficiency theory under the condition of a CP testing antenna. Second, the array element consists of a driven and director patches, and the director patches tilt the element beam from broadside direction to focal point, and then obviously enhance the electric field focusing gain. Third, the proposed array antenna achieves much less size of focal point by using much less element number than published papers. The curves for the impedance and axial ratio (AR) as function of frequency, focus width and depth are analyzed. The simulated and measured results basically agree.

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Section: Excitation Methodsmentioning

confidence: 99%

“…Design criteria for NFF antenna has been addressed in earlier study . Many NFF antennas have been proposed these years …”

Section: Introductionmentioning

confidence: 99%

An enhanced circular polarization near‐field focused antenna array by director patches

Huang

Wang

2018

Micro & Optical Tech Letters

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“…Parametric studies are performed using Ansoft Simulation Software High‐Frequency Structure Simulator. To show single‐element radiation pattern improvement, far‐field radiation pattern of pentagon patch antenna including copolarization and cross‐polarization in the y‐z plane is compared with rectangular patch antenna used as a single‐element of NFF array antenna in the previous study as illustrated in Figure . As it is evident from Figure , antenna radiation pattern is nearly directional (leads to higher gain) in zenith plane ( y‐z plane) and exhibits a 2.1 dB improvement in directivity.…”

Section: Antenna Design Proceduresmentioning

confidence: 99%

“…In addition, SLLs reduction and antenna radiation pattern orientation are achieved simultaneously. The phase of feeding currents is adjusted to concentrate the radiated field at 80 cm distance located in Fresnel region (2 L 2 / ƛ = 256 cm) , with 16 radiators, so each radiator element is fed with particular phase. As our goal is to increase power density and minimize the spot size, uniform aperture distribution is considered.…”

Section: Introductionmentioning

confidence: 99%

Characteristic improvement of near‐field focused array microstrip planar antenna in ISM band

Samadi

2015

Micro & Optical Tech Letters

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A variation of the spot size reduction and power density enhancement problem have arisen in the study of focused array antennas for many applications such as hyperthermia. In this letter using nearly directional single‐element patch antenna, and optimizing phase distribution accuracy, power density enhancement, spot size reduction, and a significant reduction in the side lobe levels are achieved. The near‐field focused (NFF) array antenna worked at 2.4 GHz with size of 40 × 40 cm2. Both simulation and experimental studies are performed to validate NFF array antenna design and improvements. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1590–1593, 2015

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“…The design of the near-field (NF) focused antenna is based on tuning the phase of the field, along the aperture of the antenna in order to obtain a locally plane wavefront at a focal point [17]. NF-focused antennas have different applications such as microwave remote sensing, and medical application [18,19]. NF-focused microstrip arrays are designed for gate-access control and industrial heating [20,21].…”

Section: Introductionmentioning

confidence: 99%

Different Designs of Dual-Focus Perforated Transmitarray Antenna in Near/Far-Field Region

Malhat¹,

Hassan

2016

AEM

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In this paper, the design of single-focused and dual-focused transmitarray antennas in the near-field (NF) or/and far-field (FF) applications are proposed. A unit-cell element consists of a dielectric square box with four identical holes is used. The phase compensation of the unit-cell elements depends on changing the hole radii according to the position of the unit-cell element, the feeding horn, and the beam direction. The radiation characteristics of 13×13 unit-cell elements transmitarray antenna focused in the near-and the far-field regions are investigated. A single structure, dual-focused transmitarray is designed using a chess-board arrangement of the unit-cell elements. Double-focused transmitarray antennas for FF/FF, FF/NF, and NF/NF are designed and investigated. The phase distributions and the corresponding hole radii for different configurations of the dual-focused transmitarray antennas are presented. The radiation characteristics of different array configurations are investigated and analyzed using a full-wave simulator CST Microwave Studio.

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Near-Field Focused Array Microstrip Planar Antenna for Medical Applications

Cited by 98 publications

References 15 publications

An enhanced circular polarization near‐field focused antenna array by director patches

An enhanced circular polarization near‐field focused antenna array by director patches

Characteristic improvement of near‐field focused array microstrip planar antenna in ISM band

Different Designs of Dual-Focus Perforated Transmitarray Antenna in Near/Far-Field Region

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