Mutual coupling reduction in array elements using EBG structures
01 Mar 2017-pp 1-2
TL;DR: In this paper, a 2D electromagnetic band gap (EBG) structure is designed on the ground plane of 1×2 rectangular patch antenna array to reduce the mutual coupling between the two elements and enhance the radiation pattern.
Abstract: A 2D electromagnetic band gap (EBG) structure is designed on the ground plane of 1×2 rectangular patch antenna array to reduce the mutual coupling between the two elements and enhance the radiation pattern. An isolation of −41 dB has been achieved with the EBG structure relative to −20 dB without the EBG.
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07 Nov 2020
TL;DR: In this paper, the mutual coupling compensation in uniform linear and circular receiving antenna arrays of thin wire dipoles is presented, and it is observed that the mutual impedance is independent of the incident angle and depends solely on the geometry of the array.
Abstract: Mutual coupling compensation in uniform linear and circular receiving antenna arrays of thin wire dipoles is presented. It was observed that the mutual impedance is independent of the incident angle and depends solely on the geometry of the array. By using only one measurement, decoupling matrix is computed and direction of arrival is estimated.
5 citations
TL;DR: Simulation results show that mutual coupling degrades the sum-rate performance of the NOMA system in all three array structures, especially in the UCA structure due to the smaller spacing of the array element in a circular shape, but compensating the mutual coupling effect by the MOM technique in the case of unknown MC or matrix inversion significantly improves the system sum- rate in all scenarios.
Abstract: This paper investigates the impact of mutual coupling (MC) on the achievable sum-rate of power-domain non-orthogonal multiple access (NOMA) system in both uplink (UL) and downlink (DL) transmissions. We assume a single-antenna user NOMA system with directional beamforming in the millimeter wave (mmW) channel. Due to the electromagnetic interaction between the antenna elements, called mutual coupling, at the base station (BS), the steering vector of the channel is affected. Consequently, this leads to distorted antenna pattern pointing towards different directions and reduction in channel gain, based on antenna array structure. In this paper, different antenna geometries and configurations, such as one-dimensional (1D) uniform linear array (ULA), two-dimensional (2D), and three-dimensional (3D) uniform circular array (UCA), are implemented at the BS, where induced electromotive force (EMF) and method of moment (MOM) techniques are used to generate the MC coefficients. We first examine the antenna patterns affected by MC, followed by channel gains of user terminals (UT)s. Then sum-rate of the NOMA system is modified in the presence of MC. Furthermore, mutual coupling is compensated successfully for both UL and DL systems for the given antenna structures. Simulation results show that mutual coupling degrades the sum-rate performance of the NOMA system in all three array structures, especially in the UCA structure due to the smaller spacing of the array element in a circular shape, resulting in symmetric mutual coupling from both sides of the circle. On the other hand, it is also shown that compensating the mutual coupling effect by the MOM technique in the case of unknown MC or matrix inversion in the case of known MC significantly improves the system sum-rate in all scenarios.
4 citations
Cites background from "Mutual coupling reduction in array ..."
...However, invasive techniques result in the complexity of the system due to physical modification of the antenna array structure [21]....
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01 Jan 2018
TL;DR: In this paper, a numerical technique for the compensation of mutual coupling in transmitting arrays of thin wire antennas is presented, where the method of moments is used to compute the scattering parameters of the array.
Abstract: This paper presents a numerical technique for the compensation of mutual coupling in transmitting arrays of thin wire antennas. The Method of Moments is used to compute the scattering parameters of the array. Using these parameters and the original excitations, a set of new excitation values are computed. The new excitation values compensate the effect of the mutual coupling. Computed results are given for linear, circular, and 3-Dimensional arrays. Uniform and binomial excitations are studied. Results obtained are compared with other available data and very good agreement is observed.
2 citations
01 Oct 2017
TL;DR: In this article, a low-profile PAA with parasitic element for wide angle scanning is designed, which can achieve a 3.2:1 bandwidth while scanning to ±75° in the E-plane, and up to ±45 degrees in the H-plane.
Abstract: In this paper, a low-profile wideband phased array antenna (PAA) with parasitic element for wide angle scanning is designed. The antenna based on tightly coupled dipole elements. With the working of parasitic element, it can achieve a 3.2:1 (from 1.35 GHz to 4.35 GHz) bandwidth while scanning to ±75° in the E-plane, scanning to ±45° in the H-plane, subject to VS WR < 2.5. The antenna unit has a very low profile (0.3λ, λ is the minimum free-space wavelength in the operating band) and large size (0.48λ).
1 citations
Cites background from "Mutual coupling reduction in array ..."
...ANTENNA DESIGN Several other designs strive to minimize the mutual coupling or suppress surface waves over the array aperture using electromagnetic band gap (EBG) [4] and ground slits [5]....
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...[4] H. Sajjad, S. Khan and E. Arvas, "Mutual coupling reduction in array elements using EBG structures," 2017 International Applied Computational Electromagnetics Society Symposium - Italy (ACES), Firenze, Italy, 2017, pp. 1-2....
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...Several other designs strive to minimize the mutual coupling or suppress surface waves over the array aperture using electromagnetic band gap (EBG) [4] and ground slits [5]....
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11 Nov 2022
TL;DR: In this paper , a circular patch microstrip antenna integrated with FSS at 8.8GHz was proposed to reduce mutual coupling between closely spaced microstrip antennas elements, which severely degrades the antenna performances.
Abstract: This paper presents the design of a circular patch microstrip antenna integrated with FSS at 8.8GHz. The proposed antenna structure reduces mutual coupling (MC) between closely spaced microstrip antenna elements. This structure also reduces cross polarization (XP) radiation, which severely degrades the antenna performances. Here, we have taken two circular patches (centre-to-centre spacing is $\mathbf{0.028}\boldsymbol{\lambda} \mathbf{g},\boldsymbol{\lambda} \mathbf{g}=\mathbf{guided}$ wavelength) and the FSS structure is inserted in between them in order to reduce the MC. In this work, the suppression of MC of 33dB and XP of 9dB are reported. This antenna structure is used as a multiple-input and multiple-output (MIMO) antenna in X-band.
1 citations
References
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TL;DR: In this paper, a mushroom-like E-plane coupled E-strip antenna array on a thick and high permittivity substrate has been analyzed using the finite-difference time-domain (FDTD) method.
Abstract: Utilization of electromagnetic band-gap (EBG) structures is becoming attractive in the electromagnetic and antenna community. In this paper, a mushroom-like EBG structure is analyzed using the finite-difference time-domain (FDTD) method. Its band-gap feature of surface-wave suppression is demonstrated by exhibiting the near field distributions of the electromagnetic waves. The mutual coupling of microstrip antennas is parametrically investigated, including both the E and H coupling directions, different substrate thickness, and various dielectric constants. It is observed that the E-plane coupled microstrip antenna array on a thick and high permittivity substrate has a strong mutual coupling due to the pronounced surface waves. Therefore, an EBG structure is inserted between array elements to reduce the mutual coupling. This idea has been verified by both the FDTD simulations and experimental results. As a result, a significant 8 dB mutual coupling reduction is noticed from the measurements.
1,394 citations
"Mutual coupling reduction in array ..." refers background in this paper
...These periodic structures can suppress surface waves to reduce mutual coupling between array elements as suggested in [3], where a mushroom-like EBG structure is analyzed and an 8 dB reduction in mutual coupling is achieved....
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Book•
24 Nov 2008TL;DR: In this paper, the FDTD method for periodic structure analysis is used for periodic structures analysis of EBG surfaces and low profile wire antennas are used for EBG surface wave antennas.
Abstract: Preface 1. Introduction 2. FDTD Method for periodic structure analysis 3. EBG Characterizations and classifications 4. Design and optimizations of EBG structures 5. Patch antennas with EBG structures 6. Low profile wire antennas on EBG surfaces 7. Surface wave antennas Appendix: EBG literature review.
634 citations
"Mutual coupling reduction in array ..." refers background in this paper
...Researchers are making use of defected ground structures (DGS), a simplified form of EBG, to enhance the radiation properties of microstrip patch antenna arrays [2]....
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03 Nov 2012
TL;DR: In this article, a micro strip patch antenna mounted over a high impedance electromagnetic band gap (EBG) substrate is proposed, which has a compact structure with a total size of 60x60mm2.
Abstract: In this paper, a micro strip patch antenna mounted over a high impedance electromagnetic band gap (EBG) substrate is proposed. The proposed antenna design is simulated on electromagnetic (EM) simulation software using FR-4 substrate with dielectric constant of 4.54 and thickness of 1.60mm. The proposed antenna has a compact structure with a total size of 60x60mm2. The bandwidth of micro strip patch antenna is enhanced by adjusting the parameters such as the gaps between adjacent patches in two orthogonal directions- the X-direction and the Y-direction respectively and the radii of the related vias. In addition, the EBG cells are placed in E-plane for surface wave reduction. A novel design of this micro strip patch antenna using mushroom-like EBG structure is integrated with these efficient methods which exhibits distinctly wider bandwidth than the conventional one. The simulated results show the good agreement with the proposed scheme.
7 citations
"Mutual coupling reduction in array ..." refers background in this paper
...These structures can help in improving the operation bandwidth [4] of the microstrip antennas which are considered narrow band antennas....
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02 Apr 2015
TL;DR: A broadband electrical metamaterial is proposed in this paper to improve the performance of microstrip antenna and improve bandwidth of micro Strip antenna as well as miniaturize it.
Abstract: A broadband electrical metamaterial is proposed in this paper to improve the performance of microstrip antenna. With the help of metamaterial we can improve bandwidth of microstrip antenna as well as miniaturize it. The properties and applications of metamaterial, three half split ring resonator metamaterial and the performance of a system contributing two patch antennas separated by means of a metamaterial based surface at 9.6 GHz for multiple input and multiple output (MIMO) application is explained in this paper. The functioning of two air spaced patch antennas is studied for comparison with that of metamaterial spaced antennas.
2 citations
"Mutual coupling reduction in array ..." refers background in this paper
...Substrates of different permittivities, different thicknesses, negative permittivity, and negative permeability are being used [1]....
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