Compact planar near-field resonant parastic antenna for multiple-input multiple-output applications

2012 ◽  
Vol 54 (3) ◽  
pp. 580-584
Author(s):  
Chia-Ching Lin ◽  
Peng Jin ◽  
Richard W. Ziolkowski
Keyword(s):  
Near Field ◽  
Multiple Input Multiple Output ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Compact Planar

scholarly journals Design and Imaging of Ground-Based Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO SAR) with Non-Collinear Arrays

2017 ◽  
Author(s):  
Cheng Hu ◽  
Jingyang Wang ◽  
Weiming Tian ◽  
Tao Zeng ◽  
Rui Wang
Keyword(s):  
Coupling Effect ◽  
Near Field ◽  
Multiple Input Multiple Output ◽  
Far Field ◽  
Imaging Result ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Edge Points ◽  
Virtual Array ◽  
Field Edge

MIMO (multiple-input multiple-output) radar provides much more flexibility than the traditional radar for its ability to realize far more observation channels than the actual number of T/R (transmit and receive) elements. Designing the array of MIMO imaging radar, the commonly used virtual array theory generally assumes that all elements are placed on the same line. However, due to the physical size of the antennas and coupling effect between T/R elements, a certain height difference between T/R arrays is essential, resulting in the defocusing of edge points of the scene. On the other hand, the virtual array theory implies far-field approximation, leading to inevitable high grating lobes in the imaging result of near-field edge points of the scene observed by common MIMO array. To tackle these problems, this paper derives the relationship between target’s PSF (point spread function) and pattern of T/R arrays, by which the design criterion of near-field imaging MIMO array is presented. Firstly, the proper height between T/R arrays is designed to focus the near-field edge points well. Secondly, the far-field array is modified to suppress the grating lobes in the near-field area. Finally, the validity of the proposed methods is verified by simulations and an experiment.

scholarly journals Dual Band Notched UWB MIMO Antenna for Surfaces Penetrating Application

2019 ◽  
Vol 8 (3) ◽  
pp. 6-15
Author(s):  
A. Chaabane ◽  
A. Babouri
Keyword(s):  
Low Cost ◽  
Multiple Input Multiple Output ◽  
Ultra Wideband ◽  
Dual Band ◽  
Mimo Antenna ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
White Portland Cement ◽  
Compact Planar

This paper introduces a novel compact planar Ultra-Wideband (UWB) Multiple-Input-Multiple-Output (MIMO) antenna with dual-band notched performance for Surfaces Penetrating (SP) application. To avoid interference from co-existing systems, two notched bands are introduced by including strips inside the radiating patches. The two ports MIMO antenna is printed on the low-cost FR4 substrate having a compact size of 56×32.47×1.5 mm3. The measured results indicate that the −10 dB bandwidth of the proposed MIMO antenna covers a wide bandwidth from 1.57 GHz to 12.4 GHz (155.05%) with dual-band rejection (2.04 GHz – 3.98 GHz and 4.8 GHz – 6.22 GHz). The effects of numerous construction and decoration surfaces on the antenna’s reflection coefficients are measured. Gypsum, White Portland Cement, Slate, Marble, Wood and Reinforced Concrete were tested. A good penetrating capability is measured which confirms the aptitude of the proposed MIMO antenna to work as SP antenna.

scholarly journals Design and Analysis of Ultra-Wideband Split Transmit Virtual Aperture Array for Through-the-Wall Imaging

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Biying Lu ◽  
Yang Zhao ◽  
Xin Sun ◽  
Zhimin Zhou
Keyword(s):  
Near Field ◽  
Multiple Input Multiple Output ◽  
Equivalence Theorem ◽  
Ultra Wideband ◽  
Multiple Input ◽  
Spread Function ◽  
Input Multiple Output ◽  
Active Imaging ◽  
Imaging Performance ◽  
Wall Imaging

The concept of virtual aperture and the point spread function for designing and characterizing ultra-wideband near-field multiple-input multiple-output active imaging array are investigated. Combining the approach of virtual aperture desynthesis with the monostatic-to-bistatic equivalence theorem, a kind of linear UWB MIMO array, the split transmit virtual aperture (STVA) array, was designed for through-the-wall imaging. Given the virtual aperture, the STVA array is the shortest in physical aperture length. The imaging performance of the designed STVA array in the near field is fully analyzed through both numerical and measured data. The designed STVA array has been successfully applied to imaging moving targets inside buildings.

scholarly journals Design of SWB MIMO Antenna with Extremely Wideband Isolation

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 194 ◽  
Author(s):  
Habib Ullah ◽  
Saeed Ur Rahman ◽  
Qunsheng Cao ◽  
Ijaz Khan ◽  
Hamid Ullah
Keyword(s):  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Swb Applications ◽  
Compact Planar

This paper presents a compact planar multiple input multiple output (MIMO) antenna for super wide band (SWB) applications. The presented MIMO antenna comprises two identical patches on the same substrate. Dimensions of the MIMO antenna are 0.17λ × 0.20λ × 0.006λ mm3, with respect to the lowest resonance of 1.30 GHz. The SWB antenna was manufactured using F4B substrate having a dielectric constant of 2.65 that provides a percent impedance bandwidth and bandwidth ratio of 187% and 30.76:1, respectively. The mutual coupling between the antenna elements is suppressed by placing a T-shaped corrugated strip in the mid of two antenna elements. The proposed MIMO antenna exhibits maximum diversity gain of 10 dB, low mutual coupling (<−20 dB), low envelope correlation coefficient (ECC < 0.02), efficiency >80%, and low reflection coefficient (<−10 dB) in the SWB frequency range (1.30 GH–40 GHz). The presented antenna is a good candidate for SWB applications. The designed antenna has been experimentally validated, and the simulated results were also verified.

scholarly journals Fourier Compatible Near-Field Multiple-Input Multiple-Output Terahertz Imaging with Sparse Non-Uniform Apertures

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Amir Masoud Molaei ◽  
Shaoqing Hu ◽  
Vasiliki Skouroliakou ◽  
Vincent Fusco ◽  
Xiaodong Chen ◽  
...  
Keyword(s):  
Near Field ◽  
Multiple Input Multiple Output ◽  
Terahertz Imaging ◽  
Multiple Input ◽  
Input Multiple Output

scholarly journals Multiple Target Localization with Bistatic Radar Using Heuristic Computational Intelligence Techniques

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Fawad Zaman ◽  
Ijaz Mansoor Qureshi ◽  
Ata Ur Rehman ◽  
Shujaat Ali Khan Tanoli
Keyword(s):  
Computational Intelligence ◽  
Figure Of Merit ◽  
Near Field ◽  
Multiple Input Multiple Output ◽  
Bistatic Radar ◽  
Coherent Signals ◽  
Active Set ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Cover Up

We assume Bistatic Phase Multiple Input Multiple Output radar having passive Centrosymmetric Cross Shape Sensor Array (CSCA) on its receiver. Let the transmitter of this Bistatic radar send coherent signals using a subarray that gives a fairly wide beam with a large solid angle so as to cover up any potential relevant target in the near field. We developed Heuristic Computational Intelligence (HCI) based techniques to jointly estimate the range, amplitude, and elevation and azimuth angles of these multiple targets impinging on the CSCA. In this connection, first the global search optimizers, that is,are developed separately Particle Swarm Optimization (PSO) and Differential Evolution (DE) are developed separately, and, to enhance the performances further, both of them are hybridized with a local search optimizer called Active Set Algorithm (ASA). Initially, the performance of PSO, DE, PSO hybridized with ASA, and DE hybridized with ASA are compared with each other and then with some traditional techniques available in literature using root mean square error (RMSE) as figure of merit.

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