Isolation Enhancement in Dual-Band Microstrip Antenna Array Using Asymmetric Loop Resonator

Dhevi, B. Lakshmi; Vishvaksenan, K. S.; Kalidoss, R.

doi:10.1109/lawp.2017.2781907

Cited by 45 publications

(21 citation statements)

References 17 publications

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“…Adding resonant structures [8], [12], [14] or modifying ground planes [5], [9] can reduce mutual coupling. Inserting an optimized isolation structure between antenna elements, the mutual coupling between them can be reduced by generating resonance or disturbing surface current.…”

Section: Design Of Isolation Structure a Mimo Antenna Geometrymentioning

confidence: 99%

“…A variety of solutions have been suggested to reduce mutual coupling of MIMO antennas [5]- [15]. By using neutralization lines [5], electromagnetic bandgap structures [6], decoupling networks [7], resonant structures [8], etc., good decoupling effects have been achieved for single-polarized MIMO antennas, even for those with spacing less than 0.5λ 0 (λ 0 is the free space wavelength). While with the use of cutting slots [9], decoupling branches [10], baffles [11], metal cavities [12], coupled metamaterial slabs [13], resonant metastructures [14], decoupling surfaces [15], etc., mutual coupling levels of dual-polarized MIMO antennas have been reduced.…”

Section: Introductionmentioning

confidence: 99%

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Mutual Coupling Reduction of ±45° Dual-Polarized Closely Spaced MIMO Antenna by Topology Optimization

et al. 2020

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A hybrid topology optimization (HTO) method is adopted to reduce the mutual coupling of a ±45 • dual-polarized closely spaced MIMO antenna. In order to shorten the optimization time, only the isolation structure region of the two-element MIMO antenna is selected for optimization. More importantly, by exploiting the symmetry of both the MIMO antenna and the isolation structure, only a quarter of the isolation structure needs to be optimized to achieve good antenna performance. In this way, not only the optimization variables, but also the optimization sub-objectives are greatly reduced, and the optimization time is further diminished. The performance of the dual-polarized MIMO antenna with the optimized isolation structure (OIS) is validated by both simulation and measurement. The OIS resonates in both polarizations, thus lowering the mutual coupling between co-polarization ports (|S 31 | and |S 42 |) and between cross-polarization ports (|S 41 | and |S 32 |) simultaneously. With the center distance of only 0.35λ 0 , the measured mutual coupling between different ports are reduced by 6∼11 dB within the 10-dB impedance bandwidth (Reflection coefficients < −10 dB) by adding the OIS, and the highest mutual coupling between different ports is reduced from −15 to −21 dB. Besides, the antenna maintains a low profile (0.026λ 0), low cross-polarization and excellent radiation pattern performance. INDEX TERMS Mutual coupling, dual-polarized antenna, MIMO antenna, isolation structure, hybrid topology optimization (HTO).

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Section: Design Of Isolation Structure a Mimo Antenna Geometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mutual Coupling Reduction of ±45° Dual-Polarized Closely Spaced MIMO Antenna by Topology Optimization

et al. 2020

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“…Regarding importance of this topic, this article deals with approaches conducted in service level agreement and its comparison regarding improved parameters, simulation or implementation environment, workload and application. In [8][9][10][11][12][13][14][15][16][17], various performance enhancement techniques are discussed.…”

Section: Related Workmentioning

confidence: 99%

Analytic Hierarchy Process for ResourceAllocation in Cloud Environment

Revathy¹,

Sekar

2018

JCSM

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Resource management is the primary issue as the demand grows for provisioning resources and computation in cloud systems. When the resource management fails to meet the QoS parameter (response time) requirements, there occurs the due-date assignment problem leading to "resource allocation problem". This can be optimized by various scheduling algorithms. In this paper analytic hierarchy process is discussed for resource sharing. The results demonstrates that this approach reduces the execution time of algorithm and effectively handles vertical elasticity by adding resources in cloud server. Moreover, the experimental results shows that proposed method can effectively allocates the resources than any other algorithms. Finally, this algorithm is also focused on how efficiency is effectively handled in cloud computing environment while allocating resources since efficiency based resource allocation scheme has been taken into account.

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“…Increasing the edge-to-edge separation between antennas or orthogonally arranging antennas 1,2 can reduce mutual coupling between antennas without any isolation or decoupling structures, but this undoubtedly makes antennas occupy larger space. More literatures on antenna decoupling are to add resonant structures such as asymmetric loop resonator, 3 well-designed ground, 4 electromagnetic bandgap (UC-EBG), cross slots, 5 etc. to suppress the coupling caused by surface wave between antennas or new coupling paths to offset the space wave coupling [6][7][8][9][10] to realize higher isolation.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band decoupling and wideband harmonic suppression for asymmetric antenna pair by using filtering structures

Zhai

Zhong

et al. 2020

Micro & Optical Tech Letters

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In this letter, a new method is proposed to achieve high port isolation and wideband harmonic suppression for two closely placed asymmetric antennas by using integrated filtering structures cascaded on the feeding microstrip lines. The proposed asymmetric antenna pair operates normally at 2.34 to 2.6 GHz and 3.31 to 3.69 GHz, respectively, containing the WLAN band (2.4‐2.484 GHz) and the fifth generation (5G) bands of China Telecom (3.4‐3.5 GHz) and China Unicom (3.5‐3.6 GHz). Compared to the reference antenna pair, the proposed antenna pair has an enhancement in isolation of 40.8 and 38.1 dB at 2.45 and 3.5 GHz individually, and the higher harmonics of up to 18 GHz generated by the reference antenna pair can be suppressed. The gain of the proposed antenna pair decreases by an average of 8.8 dB in the higher harmonic frequency bands. The measured results of the manufactured antenna pair agree well with the simulated results, indicating that the designed antenna pair has good dual‐band decoupling and wideband harmonic suppression characteristics. This method particularly reduces the complexity of the decoupling antenna design and is suitable for the future multi‐functional terminals.

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Isolation Enhancement in Dual-Band Microstrip Antenna Array Using Asymmetric Loop Resonator

Cited by 45 publications

References 17 publications

Mutual Coupling Reduction of ±45° Dual-Polarized Closely Spaced MIMO Antenna by Topology Optimization

Mutual Coupling Reduction of ±45° Dual-Polarized Closely Spaced MIMO Antenna by Topology Optimization

Analytic Hierarchy Process for ResourceAllocation in Cloud Environment

Dual‐band decoupling and wideband harmonic suppression for asymmetric antenna pair by using filtering structures

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