Isolation Improvement of Compact Microbase Station Antenna Based on Metasurface Spatial Filtering

Yin, Bo; Zhao, Shiwei; Wang, Ping; Feng, Xi‐Qiao

doi:10.1109/temc.2020.3004189

Cited by 20 publications

(7 citation statements)

References 19 publications

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“…In the study by Feng et al, 21 an artificial magnetic conductor-backed reflector and the orthogonal differentially fed structure are added in designing of a low-profile dual-polarized antenna, which can enhance the gain, bandwidth, and port isolation. The symmetrical feeding network is used to reduce the coupling of the antennas, furthermore, a modified closed-loop metasurface structure is used to suppress spatial coupling in Yin et al 22 Metamaterial structures are added to enhance the port isolation of patch antenna arrays 23,24 However, the above-mentioned decoupling structures have strong pertinence, which is particularly designed for specific MIMO antennas. In other words, the above-mentioned decoupling techniques have no universality.…”

Section: Introductionmentioning

confidence: 99%

Wideband decoupling technique for two‐element antenna array by using pixel neutralization line

Cheng

et al. 2022

Micro & Optical Tech Letters

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This letter proposes a high isolation two-element multiple input multiple output (MIMO) antenna by using a wideband pixel neutralization line (NL). The design procedures are simplified as follows: (1) Obtaining the Y-parameters of the original two-element antenna with a grid of microstrip stubs, and discrete ports are inserted among microstrip stubs; (2) obtaining the binary codes of the optimum route. Importing Y-parameters into MATLAB, and using a genetic algorithm to obtain the optimum connection route by design formulas upon scattering matrix which guarantees high isolation; (3) translating the binary codes into the actual connection metallic lines; (4) adding the designed pixel NL and appropriate matching branches into EM simulator to optimize the antenna; (5) obtaining a high isolation two-element antenna. The original two-element antenna has poor isolation with the main path coupling, and the pixel NL provides an auxiliary coupling path between two elements. By adjusting pixel NL, the magnitude strengths of two coupling signals realize the same, while the phases are exactly opposite. Therefore, the wideband high isolation between antenna elements is realized. To verify the practicability of the proposed pixel decoupling neutral line, a reference and proposed two-element MIMO antennas are fabricated and measured. In the experiment, the isolation of the proposed two-element antenna with an edgeto-edge distance of 0.0943λ 0 (λ 0 is the wavelength in free space at the center frequency) is enhanced by about 17 dB in the working frequency band from 0.975 to 1.025 GHz. Besides, an L-typed feeding network is added to guarantee a good matching condition. The proposed two-element antenna has a size of 0.617λ 0 × 0.667λ 0 , and the dimension of each radiation patch is 0.3267λ 0 × 0.0725λ 0 . The proposed GA algorithm-based decoupling technique has a significant superiority over traditional ones. Efficient, simple, and onetime EM simulation are its major advantages, which can liberate the RF engineer from the heavy debugging work.

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Section: Introductionmentioning

confidence: 99%

Wideband decoupling technique for two‐element antenna array by using pixel neutralization line

Cheng

et al. 2022

Micro & Optical Tech Letters

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“…To achieve in-band decoupling (IBD), it is intuitive to insert a band-stop FSS wall between antennas, 16,17 or arrange a single-negative metasurface above antennas. [18][19][20][21] Besides, over-the-air coupling can be canceled out by loading antenna decoupling surface (ADS), 22,23 dielectric superstrate [24][25][26][27][28] or parasitic structures, 29 since they introduce an additional coupling path with equal magnitude and opposite phase.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band stacked base station antenna array with high isolation

Chu

2022

Int J RF Mic Comp-Aid Eng

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A high‐isolation dual‐band base station antenna array is proposed. At first, a 5‐element high‐band (HB) dipole antenna array with inter‐element distance of 0.4 λH0 (the free‐space wavelength at the center frequency of the HB) is decoupled. With the main antenna decoupling surface (ADS), metal baffles and auxiliary ADS, the E‐plane and H‐plane couplings can be reduced to <−23.1 dB (<−11.4 dB without decoupling) and <−22.6 dB (<−14.8 dB without decoupling), respectively. The dual‐layer ADS design successfully resolves the contradiction between decoupling performance and matching. The ground plane of the 5‐element array is then exploited as the low‐band patch radiator, forming the proposed dual‐band antenna array. Measured results show that satisfactory cross‐band isolation (>33.1 dB), in‐band isolation (>22.2 dB) and polarization isolation (>30 dB) are obtained. Stable unidirectional radiation patterns are also acquired.

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“…High isolation is achieved with a mirrored F-shaped DGS which is accordingly improved from around 10 dB to 25 dB [5]. In [6], by introducing rectangular metal parasitic radiation patches, the isolation of the dual-polarized antenna is improved by 8 dB. Complementary split-ring resonator (CSRR) can represent an LC circuit resonator because it can store low-frequency energy and "trap" ground currents, inhibiting currents from reaching other components [7].…”

Section: Introductionmentioning

confidence: 99%

A Dual-Band Compact Four-Port Mimo Antenna Based on Ebg and CSRR for Sub-6 GHZ Applications

Sun¹,

Pan²,

Wang³

et al. 2022

PIER Letters

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A compact sub-6 GHz multiple-input multiple-output (MIMO) antenna based on a complementary split-ring resonator (CSRR) and electromagnetic bandgap (EBG) is proposed in this paper. The antenna has an interesting structure and a compact size of 38 × 38 mm 2 . Four identical antenna elements are deposited orthogonally to each other, using polarization diversity and adding decoupling structures, so that good isolation and miniaturized size can be obtained. The isolation is less than −17.5 dB in the operating bandwidth of 3.28-3.62 GHz and −19.5 dB in 4.78-5.04 GHz. The simulation results are consistent with the measured ones, indicating that the antenna is suitable for Sub-6 GHz communication equipment.

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Isolation Improvement of Compact Microbase Station Antenna Based on Metasurface Spatial Filtering

Cited by 20 publications

References 19 publications

Wideband decoupling technique for two‐element antenna array by using pixel neutralization line

Wideband decoupling technique for two‐element antenna array by using pixel neutralization line

Dual‐band stacked base station antenna array with high isolation

A Dual-Band Compact Four-Port Mimo Antenna Based on Ebg and CSRR for Sub-6 GHZ Applications

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