Mutual Coupling Reduction of Slot Antenna Array by Controlling Surface Wave Propagation

Self Cite

In this article, we present an efficient approach to reduce mutual coupling in a planar slot antenna array by using high refractive index metamaterial. The metamaterial structure is employed to steer the propagation of the surface wave. For this purpose, array of complementary slot coupled split‐ring resonator structures are designed on the two sides of the slot array. The proposed configuration is fabricated and both simulation and measurement results confirm that an average of 10 dB improvements in isolation level is achieved throughout the wide operating bandwidth. Moreover, due to the implementation of the complementary metamaterial structure, the proposed configuration becomes planar and easy to fabricate.

Section: Mutual Coupling Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A technique for reduction of mutual coupling by steering surface wave propagation

Ghosh

Mitra

2020

Self Cite

“…Since split ring resonator (SRR) was proposed by Pendry et al, many magnetic metamaterials (MM) have been proposed to obtain negative permeability at microwave frequencies . Due to the negative permeability, MM can inhibit the penetration of magnetic fields and thus hinder the propagation of EM waves.…”

Section: Magnetic Metamaterials Designmentioning

confidence: 99%

“…Since split ring resonator (SRR) was proposed by Pendry et al, 21 many magnetic metamaterials (MM) have been proposed to obtain negative permeability at microwave frequencies. [22][23][24][25][26][27] Due to the negative permeability, MM can inhibit the penetration of magnetic fields and thus hinder the propagation of EM waves. Inspired by this, we proposed to reduce enhance isolation between identical antenna elements using MM in our previous work.…”

Section: Magnetic Metamaterials Designmentioning

confidence: 99%

Harmonic interference suppression within a multiple‐antenna system using integrated slender magnetic metamaterials

Yang

Wang

Han

et al. 2019

In a multiple‐antenna system, harmonics of lower‐frequency antennas will interfere with higher‐frequency antennas, especially when the latter operates around the harmonic frequencies of the former. In this communication, we propose to suppress harmonic interferences in multiple‐antenna systems using integrated magnetic metamaterials (MM). To this end, we firstly designed a slender MM suitable for integration. Interdigital capacitor is adopted to make the MM slender enough to accommodate itself within the narrow gap between antennas. When magnetic field lines thread through the MM, negative permeability can be achieved due to strong magnetic resonance, which will block harmonic magnetic fields of an antenna penetrating into its neighbors. As an example, we investigated a dual patch‐antenna system, where the smaller one operates at the second‐harmonic frequency of the larger one and the MM is integrated in the gap between them. By adjusting structural parameters, the second‐harmonic magnetic fields of the larger antenna are blocked from penetrating into the smaller antenna. In this way, harmonic interferences within the antenna system can be suppressed. A prototype, together with a reference sample, was fabricated and measured. Both the measured and simulated results verify that with the MM, the harmonic coupling is reduced down to below −20 dB even when the gap between the two antennas is only about 0.06λ. Compared with the reference sample, the harmonic coupling is reduced by more than 7 dB. This work provides an alternative method of reducing harmonic interferences within multiple‐antenna systems to enhance the electromagnetic compatibility.

“…Also, in Reference , the authors recorded 13 dB mutual coupling reduction at 5 GHz using fractal EBG structure. Isolation between 2 slot antennas was increased by 14 dB using (Complementary Split Ring Resonator) CSRR and fishnet structure between 8 and 10 GHz . A novel fractal EBG structure was used between planar inverted‐F (PIFA) antennas to achieve about 27 and 40 dB mutual coupling reduction in the E‐plane and H‐plane, respectively, around 2.65 GHz .…”

Section: Introductionmentioning

confidence: 99%

Highly reduced mutual coupling between wideband patch antenna array using multiresonance EBG structure and defective ground surface

Sokunbi

Attia

2019

This paper presents a novel slotted wideband microstrip patch antenna array with 2 decoupling structures that enabled isolation enhancement between 10 and 40 dB throughout the operating bandwidth of 4‐6.5 GHz. Four asymmetrical patches were first used as a unit cell to produce a multiresonance electromagnetic band gap (EBG) structure capable of increasing the isolation between the patch array by about 50 dB within the impedance bandwidth of 5.8‐6.4 GHz. By introducing 3 double F‐shaped etchings in the array ground plane, the isolation bandwidth is extended to 4.0‐6.5 GHz (ie, 48%) with measured isolation improvement of 10‐40 dB over the entire isolation bandwidth. The multiresonance EBG structure mitigates the surface waves propagating in the substrate while the double F‐shaped ground plane reduces the surface waves traveling on the ground plane. The edge‐to‐edge spacing between the 2 patch antennas is 25.2 mm which is equivalent to 0.42 λ0 (λ0 is the free‐space wavelength at the center frequency of 5.0 GHz). After loading the decoupling structures in the antenna array, the gain increased from 5.6 dB to 7 dB. The proposed antenna is fabricated and there is an acceptable agreement between the simulated and measured results. The antenna radiation characteristics are observed to be fairly consistent over the large operating bandwidth of 4‐6.5 GHz. The proposed antenna is a potential candidate for wideband wireless applications in the sub‐6 GHz band.