Recent advancements in array signal processing focus on enhancing source detection and reducing the effects of mutual coupling among array elements. This has been achieved using direction of Arrival (dOA) estimation v...
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Recent advancements in array signal processing focus on enhancing source detection and reducing the effects of mutual coupling among array elements. This has been achieved using direction of Arrival (dOA) estimation via virtual arrays formed by sparsearrays. Non-Redundant arrays (NRAs) are a very common structure among sparsearrays. Traditionally, one-dimensional NRAs capture either azimuth or elevation angles of sources, but practical scenarios often require both simultaneously. This paper introduces optimized methods for designing twodimensional (2-d) NRAs to address this need. In addition to the optimizeddesign approach for creating 2-d NRAs with minimum aperture, the optimizeddesign approaches for creating 2-d NRAs with desired aperture, with minimized mutual coupling effect and with hybrid of both are proposed. The designedarrays can be in the form of a rectangle or a regular polygon with the number of sides being a multiple of 4. The proposedarraydesign methods significantly enhance the flexibility in designing NRAs, allowing the creation of various array configurations for any desired number of sensors. Simulation results show that the proposedarrays outperform the existing 2-darrays in estimating the dOAs of signal sources and show more robustness against the effects of mutual coupling.
In this letter, we propose a generic design method of spiral multiple-input-multiple-output (MIMO) antenna arrays for short-range ultrawideband imaging applications. This approach offers superior uniformity and low el...
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In this letter, we propose a generic design method of spiral multiple-input-multiple-output (MIMO) antenna arrays for short-range ultrawideband imaging applications. This approach offers superior uniformity and low element shadowing properties in an effective aperture. Moreover, several variables are provided to further tune the positioning of elements. The proposed method avoids a disruptive array topology that exists in the curvilinear array for certain transmit and receive array combinations. Two spiral MIMO arrays are developed and shown to have better focusing property than curvilinear and rectangular arrays. Experimental results are also demonstrated to verify the imaging capability of the proposed spiral array.
An optimization method for ultrawideband multiple-input-multiple-output (MIMO) planar array topology design, which can satisfy both uniformity and lower element shadowing principles, is proposed by extending our previ...
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An optimization method for ultrawideband multiple-input-multiple-output (MIMO) planar array topology design, which can satisfy both uniformity and lower element shadowing principles, is proposed by extending our previous work. Two planar MIMO arrays, namely, the basic optimal array (BOA) and the extended optimal array (EOA) are optimized. The focusing and sidelobe-suppression properties of the BOA and the EOA are demonstrated to be superior to other two previous state-of-the-art planar MIMO arrays. The advantages of the two optimizedarrays in 3-d imaging are further indicated by experimental results for different distributed targets. The validity of the proposed method is verified by the excellent performances of the BOA and the EOA.
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