A Near-Field Focused Circular Array Based on Dielectric Resonator Antenna

Huang, Runze; Liu, Beijia; Tan, Qi

doi:10.1109/aps/ursi47566.2021.9704092

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…It is seen that as the focus is shifted away from the array, the peak value of the field decreases, as it is affected by the 1/R propagation factor. Therefore, the variation of the actual focal length has been achieved by using a single variable phase shifter, which is much easier than the method reported in [19], where the radius of the array has to be adjusted or by changing the thickness of a metallic layer containing the radiating holes as suggested in [21].…”

Section: Computer Simulations In Matlabmentioning

confidence: 99%

“…The 2-ring designed array was then developed into a 3-ring array comprising two phase shifters to achieve a smaller focal spot [18]. A focused circular array antenna operating at 2.45 GHz and employing 16 elements placed on two circles was reported in [19]. The elements were rectangular dielectric resonators fed by coaxial feeders.…”

Section: Introductionmentioning

confidence: 99%

“…The variation of the focal length is achieved by feeding the elements of the inner ring through a single variable phase shifter that compensates the path difference of the two rings and yields focusing at a certain distance from the array. The proposed design offers flexibility and easy implementation, as it offers an electronic means to vary the focal distance in contrast to the designs presented in [19] and [21] where one of the array dimensions has to be changed.…”

Section: Introductionmentioning

confidence: 99%

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A Focused Circular Array with Variable Focal Length

Sayidmarie,

Fwzi

2023

PIER M

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Focused arrays are attracting increased interest because of their wide range of applications. Focusing the antenna's radiation in the near field requires proper phase distribution of the array elements that must be fed through many phase shifters. This work presents a design idea for a focused circular array antenna, whose focal distance can be varied by only a single variable phase shifter. The idea is implemented on a dual ring circular array having a six-wavelength diameter and focused at five wavelengths by using a single fixed phase shifter. Theoretical analysis and computer simulations of a sample design using MATLAB and CST Microwave Studio show that a phase change of 0.9π leads to a four wavelength change in the focal distance. A formula for the estimation of the depth of field DOF is derived. The proposed array offers a simple method to vary the focal length continuously by a single variable phase shifter. This idea can be utilized in hyperthermia, RFID, and imaging applications, where the position of the focal spot needs to be moved along the normal to the array.

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Section: Computer Simulations In Matlabmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Focused Circular Array with Variable Focal Length

Sayidmarie,

Fwzi

2023

PIER M

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“…The proposed design employed cavity-backed radiating slots placed on a circle, which are covered by a metasurface layer. A near-field focused circular array antenna operating at 2.45 GHz was reported in [18]. The array has 16 rectangular dielectric resonator elements fed by coaxial feed and placed on two circles.…”

Section: Introductionmentioning

confidence: 99%

A Circular Array with Improved Focusing Properties

Fwzi¹,

Sayidmarie²

2022

PIER C

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A concentric circular array consisting of two rings is proposed to focus the radiated field at a point in the near-field zone. In the proposed two-ring array, the radius of the outer ring was chosen so that the radiated fields from all elements on the two rings add constructively at the focal point, thus no phase shifter is needed in this design. The N elements of the inner ring are uniformly excited in unity amplitude and zero phase, while the M elements on the outer ring are excited uniformly in phase, and given uniform magnitude excitations of N/M . Therefore, two deep nulls are achieved on both sides of the focus to enhance the focal width. The focusing properties are investigated by exploring the array parameters, such as variation of the focused field along the normal to the array, field distribution on the focal plane, and depth of field (size of the focal spot). Computer simulations using the MATLAB environment are performed by point source radiators. For verification, the array was simulated using the CST microwave studio, and the obtained results showed good agreement. The array is useful for hyperthermia and imaging applications.

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Formation of the Electric Field Strength Maximum at a Given Point in Space by a Focused Linear Antenna Array

Iuzvik,

Stepanov

2023

2023 IEEE 24th International Conference of Young Professionals in Electron Devices and Materials (EDM)

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A Near-Field Focused Circular Array Based on Dielectric Resonator Antenna

Cited by 3 publications

References 6 publications

A Focused Circular Array with Variable Focal Length

A Focused Circular Array with Variable Focal Length

A Circular Array with Improved Focusing Properties

Formation of the Electric Field Strength Maximum at a Given Point in Space by a Focused Linear Antenna Array

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