Frequency Diversity Array for Near-Field Focusing

Han, Xinjie; Ding, Shuai; Huang, Yong Mao; Zhou, Yuliang; Tang, Huan; Wang, Bing‐Zhong

doi:10.3390/electronics9060958

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…FDA has been receiving increasing attention due to its unique range and angular spatial focusing properties [11][12][13][14]. To optimize the FDA dot-shaped beampattern, rangeangle coupling in the FDA beampattern can be removed by using nonlinear array element spacing to break the periodicity of FDA [15] and by using a logarithmically increasing frequency offset [16].…”

Section: Introductionmentioning

confidence: 99%

Beampattern Synthesis and Optimization for Frequency Diverse Arc Array Based on the Virtual Element

Huang

Tan

et al. 2023

Electronics

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With its special, arch-shaped array structure, a frequency diverse arc array (FDAA) can perform beam scanning in 360 degrees in azimuth and in arbitrary ranges by selectively activating array elements in different positions, utilizing array element phase compensation, and adopting a frequency offset design. In this paper, a beampattern synthesis and optimization method for FDDA using the virtual array element based on the geometric configuration of FDDA is proposed. First, the position of the virtual array element is determined by the direction of the target, and then activated array elements are selected. Afterwards, the frequency offset of each array element is set up on the equiphase surface to obtain the dot-shaped beampattern. Finally, amplitude weighting is introduced to suppress the increased sidelobe level of the dot-shaped beampattern, which is caused by inverse density weighting of the arch-shaped array structure. Simulation results validate the proposed method for beampattern synthesis and optimization in FDAA.

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Section: Introductionmentioning

confidence: 99%

Beampattern Synthesis and Optimization for Frequency Diverse Arc Array Based on the Virtual Element

Huang

Tan

et al. 2023

Electronics

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“…By adjusting the radius of the circles, the antenna achieves a controllable focal distance. A numerical optimization method was proposed to achieve the near-field focusing of square arrays and circular arrays, using the frequency diversity array approach to adjust the initial amplitude and operating frequency [19]. Numerical methods and full-wave simulation were used to verify the design.…”

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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Frequency Diversity Array for Near-Field Focusing

Cited by 2 publications

References 34 publications

Beampattern Synthesis and Optimization for Frequency Diverse Arc Array Based on the Virtual Element

Beampattern Synthesis and Optimization for Frequency Diverse Arc Array Based on the Virtual Element

A Circular Array with Improved Focusing Properties

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