Low-Interacted Multiple Antenna Systems Based on Metasurface-Inspired Isolation Approach for MIMO Applications

Althuwayb, Ayman A.

doi:10.1007/s13369-021-05720-6

Cited by 47 publications

(37 citation statements)

References 34 publications

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“…The contributions of different sets can be added or averaged. Experiments show that the PSF function obtained by directly accumulating have a lower sidelobe level which is better for imaging application [27]. This conclusion will be applied again in next part when deriving the modified incoherent power calculation formula.…”

Section: Psm Algorithm For Mimo-sar Imagingmentioning

confidence: 65%

“…With the growing demand for compact array antennas, the physical footprint of the arrays needs to be smaller and the consequence of this is severe degradation in the performance of the array resulting from strong mutual-coupling and crosstalk effects between adjacent radiating elements. Thus, many researchers have conducted in-depth research on this problem and provided some solutions to the coupling problem in the imaging system such as metamaterial (MTM) [26], metasurface (MTS) [27] and hybrid coupler approaches [28], which promoted the development of the terahertz imaging system.…”

Section: Introductionmentioning

confidence: 99%

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Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band

Yang

et al. 2021

Remote Sensing

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In multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) systems, sparse arrays are usually applied, resulting in increased sidelobes of the point spread function. In this paper, a phase shift migration (PSM) imaging algorithm based on the explosion reflection model with modified coherent factor was proposed for sidelobe suppression in MIMO-SAR three-dimensional (3D) imaging application. By defining the virtual difference wavenumber, reconstructing the raw echo by data rearrangement in wavenumber domain, the original coherent factor algorithm operating in spatial domain can be achieved by the PSM algorithm frame in the wavenumber domain, which means two orders of magnitude increase in computational efficiency. The correctness of the theory is verified by simulation. Finally, a bistatic prototype imaging system in the 0.3 THz band was designed for the proof-of-principle experiments. The experimental results show that the proposed algorithm has a 0.948 structural similarity value to the original coherent factor back-projection algorithm (CF-BPA) which means comparable image quality with much superior efficiency.

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Section: Psm Algorithm For Mimo-sar Imagingmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band

Yang

et al. 2021

Remote Sensing

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“…This mutual coupling impact distorts the radiation pattern of antennas, alters antenna's impedance matching, all of which led to a decrement in MIMO device power [18,19]. Furthermore, the metasurface isolation technique used by [20] to increase the isolation and reduce the coupling effects. A wideband antenna was designed with low sidelobe [21] and inter-port isolation to reduce the coupling [22].…”

Section: Introductionmentioning

confidence: 99%

A Bra Monitoring System Using a Miniaturized Wearable Ultra-Wideband MIMO Antenna for Breast Cancer Imaging

et al. 2021

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This paper represents a miniaturized, dual-polarized, multiple input–multiple output (MIMO) wearable antenna. A vertically polarized, leaf-shaped antenna and a horizontally polarized, tree-shaped antenna are designed, and the performance of each antenna is investigated. After designing the MIMO antenna, it is loaded with stubs, parasitic spiral, and shorting pins to reduce the coupling effects and remove the unwanted resonances. Afterward, the two-port MIMO cells are spaced by 2 mm and rotated by 90° to create three more cells. The antennas are designed using two layers of denim and felt substrates with dielectric constants of 1.2 and 1.8, and thicknesses of 0.5 mm and 0.9 mm, respectively, along with the ShieldIt™ conductive textile. The antenna covers a bandwidth of 4.8–30 GHz when the specific absorption rate (SAR) meets the 1 g and 10 g standards. Isolation greater than 18 dB was obtained and mutual coupling was reduced after integrating shorting pins and spiral parasitic loadings. A maximum radiation efficiency and directive gain of 96% and 5.72 dBi were obtained, respectively, with the relatively small size of 11 × 11 × 1.4 mm3 for the single element and final dimensions of 24 × 24 × 1.4 mm3 for the full assembly. The antenna’s performance was examined for both on-body (breast) and free space conditions using near-field microwave imaging. The achieved results such as high fidelity, low SAR, and accuracy in localization of the tumour indicate that the MIMO antenna is a decent candidate for breast cancer imaging.

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“…This has the merits of simple structure and symmetrical radiation pattern. In addition, the low mutual coupling is needed in many wireless systems [35][36][37]. Thanks to no overlapping radiating aperture, the proposed antenna can achieve high port isolation in the two bands.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Antenna with Equal Beamwidth in Two Frequency Bands for Radar Applications

2021

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This paper presents a novel hybrid antenna with equal beamwidth in two frequency bands for short-range radar applications. The proposed design consists of a 2 × 2 patch array and a SIW-fed dielectric rod antenna. The two kinds of radiators are responsible for the 5.8 GHz and 24 GHz ISM bands, respectively. Pencil beams are obtained in both lower and upper bands. The beamwidth generated by the dielectric rod can be flexibly tuned to coincide with that of the patch array. Magneto-electric (ME) dipole, composed of a slot and two parasitic monopoles, is constructed to replace the conventional 3-D waveguide feeder, which can excite the dielectric rod effectively. The complementary structure is helpful to obtain a pencil beam. The 2 × 2 patch array has the size of 70 × 70 mm2 and is fed by a four-way power divider. Due to no overlapping radiating aperture, the two radiators can work independently with high port isolation. The measured peak gain in the two bands is 12.5 dBi and 12.7 dBi. The measured 3-dB beamwidth at 5.8 GHz and 24 GHz is 42° and 39° in x-z plane, and 43° and 42° in the y-z plane. The proposed antenna features a small beamwidth difference in two frequency bands, thus being attractive for dual-band radar systems.

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Low-Interacted Multiple Antenna Systems Based on Metasurface-Inspired Isolation Approach for MIMO Applications

Cited by 47 publications

References 34 publications

Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band

Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band

A Bra Monitoring System Using a Miniaturized Wearable Ultra-Wideband MIMO Antenna for Breast Cancer Imaging

A Hybrid Antenna with Equal Beamwidth in Two Frequency Bands for Radar Applications

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