Mutual Coupling Reduction in an Array of Patch Antennas Using CLL Metamaterial Superstrate for MIMO Applications

Jafargholi, Ali; Jafargholi, Amir; Choi, Jun H.

doi:10.1109/tap.2018.2874747

Cited by 96 publications

(53 citation statements)

References 27 publications

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“…This is due to the unwanted interactions resulting from surface waves and near-field radiation. This is because patch antennas excite surface waves, which are guided by the substrate and the ground-plane [47][48][49].…”

Section: Figure 2 a Typical Microwave Imaging System In Which The Prmentioning

confidence: 99%

Metamaterial-Inspired Antenna Array for Application in Microwave Breast Imaging Systems for Tumor Detection

et al. 2020

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This paper presents a study of a planar antenna-array inspired by the metamaterial concept where the resonant elements have sub-wavelength dimensions for application in microwave medical imaging systems for detecting tumors in biological tissues. The proposed antenna consists of square-shaped concentric-rings which are connected to a central patch through a common feedline. The array structure comprises several antennas that are arranged to surround the sample breast model. One antenna at a time in the array is used in transmission-mode while others are in receive-mode. The antenna array operates over 2-12 GHz amply covering the frequency range of existing microwave imaging systems. Measured results show that compared to a standard patch antenna array the proposed array with identical dimensions exhibits an average radiation gain and efficiency improvement of 4.8 dBi and 18%, respectively. The average reflection-coefficient of the array over its operating range is better than S 11 ≤-20 dB making it highly receptive to weak signals and minimizing the distortion encountered with the transmission of short duration pulse-trains. Moreover, the proposed antenna-array exhibits high-isolation on average of 30dB between radiators. This means that antennas in the array (i) can be closely spaced to accommodate more radiators to achieve higher-resolution imaging scans, and (ii) the imagining scans can be done over a wider frequency range to ascertain better contrast in electrical parameters between malignant tumor-tissue and the surrounding normal breast-tissue to facilitate the detection of breast-tumor. It is found that short wavelength gives better resolution. In this experimental study a standard biomedical breast model that mimics a realhuman breast in terms of dielectric and optical properties was used to demonstrate the viability of the proposed antenna over a standard patch antenna in the detection and the localization of tumor. These results are encouraging for clinical trials and further refinement of the antenna-array.

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Section: Figure 2 a Typical Microwave Imaging System In Which The Prmentioning

confidence: 99%

Metamaterial-Inspired Antenna Array for Application in Microwave Breast Imaging Systems for Tumor Detection

et al. 2020

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“…Moreover, Cheng et al designed an array patch antenna configuration with the integration of an polarization conversion isolator to improve the antenna system parameters distorted by the coupling effect [11]. Additionally, there are many approaches and studies in the related literature focusing on improving the isolation by reducing the coupling effects between closely placed antenna elements in MIMO antennas [12][13][14][15]. In one of the recent studies, a metamaterial absorber structure is designed and integrated to a four-element array antenna for 1.27 GHz band by Zhang et al [14].…”

Section: Of 10mentioning

confidence: 99%

Mutual Coupling Reduction of Cross-Dipole Antenna for Base Stations by Using a Neural Network Approach

et al. 2020

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In this manuscript, a resonator layer is presented for the purpose of reducing the mutual coupling effect between each antenna element of a cross dipole antenna. In design processes, an artificial neural network approach was used for various resonator designs. In the operating frequency band of 2.2–2.7 GHz, 48 different 6 × 6 resonator layers were created and integrated into the cross dipole antenna to reduce transmission and improve isolation between each antenna elements. Moreover, when training an artificial neural network in the Matlab program, 48 different resonator layers were used with the return losses and transmission values of cross dipole antenna elements. After training process, eight unknown resonator designs were tested and accurate results were obtained. Finally, one of the resonator planes, which was obtained from the artificial neural network, was fabricated and experimentally tested, then an accurate result was obtained. This study provides a good solution, especially for improving isolation in multiport antenna systems, using an artificial neural network approach.

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“…In [17], the small size of a proposed uniplanar EBG reduced the distance between two antennas and decreased mutual coupling 19 and 11 dB in the E-plane and H-plane at 5.8 GHz. One of the practical ways of enhancing isolation is a 3D structure, which has been used in [3,13,[18][19][20][21]. One can say that 3D-dimensionality of the structure and egress final antenna from the planar state are the most important disadvantages of the mentioned studies.…”

Section: Introductionmentioning

confidence: 99%

Mutual-coupling reduction in triple-band MIMO antennas for WLAN using CSRRs

Najafy

Bemani

2020

Int. J. Microw. Wireless Technol.

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For the requirements of low mutual-coupling MIMO antennas for WLAN, a new complementary split-ring resonator (CSRR) unit cell is introduced in this paper. A microstrip-fed Vivaldi antenna array is designed for WLAN applications, where compact triple-band gap-complementary split-ring resonator unit cells are loaded between two antennas to examine the effect of unit cells on the rate of mutual-coupling reduction. By inserting the CSRR, the final design offered an improvement in decoupling by 8.5, 10.5, and 18 dB at 3.65, 4.9, and 5.8 GHz, respectively, compared with the reference antenna. By suppressing surface waves, antenna gain and front-to-back ratio are improved.

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Mutual Coupling Reduction in an Array of Patch Antennas Using CLL Metamaterial Superstrate for MIMO Applications

Cited by 96 publications

References 27 publications

Metamaterial-Inspired Antenna Array for Application in Microwave Breast Imaging Systems for Tumor Detection

Metamaterial-Inspired Antenna Array for Application in Microwave Breast Imaging Systems for Tumor Detection

Mutual Coupling Reduction of Cross-Dipole Antenna for Base Stations by Using a Neural Network Approach

Mutual-coupling reduction in triple-band MIMO antennas for WLAN using CSRRs

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