Isolation Enhancement for MIMO Patch Antennas Sharing a Common Thick Substrate: Using a Dielectric Block to Control Space-Wave Coupling to Cancel Surface-Wave Coupling

Li, Min; Jamal, Muhammad Yasir; Jiang, Lijun; Yeung, Kwan L.

doi:10.1109/tap.2020.3026897

Cited by 59 publications

(41 citation statements)

References 38 publications

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“…For Combination A, the MC is below Table 1 shows that the proposed TPCFMAA has the minimum inter-element spacing (λ h ) except that in [25] but [25] occupies 64 times more volume (in λ 3 h ) than TPCF-MAA. The TPCFMAA has broader percentage bandwidth than [24], comparable percentage bandwidth with [7] but lesser percentage bandwidth than [8], [9], [25], [26] and [27]. However, excellent bandwidth improvements will be shown for TPDRAA employing meta-grid lines in the ground plane as discussed in section IV.…”

Section: Introductionmentioning

confidence: 94%

“…Capacitively loaded loop based MTM superstrate and metasurface (MS)-based decoupling techniques are used for isolation enhancement in [24] and [25]. The decoupling in [26] is realized by adding a pure DB above the coupled array, and a ceramic superstrate in [27]. All these four designs have decoupling structures between or above the antenna elements, which significantly increase the antenna footprint.…”

Section: Introductionmentioning

confidence: 99%

“…However, excellent bandwidth improvements will be shown for TPDRAA employing meta-grid lines in the ground plane as discussed in section IV. The TPCFMAA is a very low profile antenna which occupies 48.6, 3.95, 44, 101.6, 64, 236 and 205 times lower volume than that of [7], [8], [9], [24], [25], [26] and [27] respectively. In fact, elements of this highly compact MIMO antenna satisfy criterion (ka < 1) for electrically small antennas [35].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, elements of this highly compact MIMO antenna satisfy criterion (ka < 1) for electrically small antennas [35]. Furthermore, the TPCF-MAA design is simple, compact and especially, does not have a multi-layer arrangement contrary to the antennas of [7], [24], [25], [26] and [27] that add excess heights to these antenna profiles.…”

Section: Introductionmentioning

confidence: 99%

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Space Efficient Meta-Grid Lines for Mutual Coupling Reduction in Two-Port Planar Monopole and DRA Array

et al. 2022

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Traditionally used mutual coupling (MC) reduction techniques such as electromagnetic bandgap structures, isolators and neutralization lines require extra space between radiators. Besides, metamaterial-based techniques require multi-layer arrangements. However, the proposed meta-grid lines overcomes the above demerits by integrating meta-grid lines in the ground plane itself. As a proof-ofconcept, two-port CPW-fed monopole antenna array (TPCFMAA) and two-port DRA array (TPDRAA) are designed, fabricated and tested. It has been observed that the TPCFMAA has mutual coupling below -20 dB for frequency between 2.6 to 4.4 GHz. The envelope correlation coefficient reduces from 0.072 to 0.026 by integrating meta-grid lines in the ground plane of the TPCFMAA. At 3.5 GHz, the inter-element distance between the antennas is noted to be 0.015λ h (λ h = highest operating wavelength). The TPDRAA's operating frequency can be tuned by changing the parameters of the annular ring slot in the excitation patch. The bandwidth of TPDRAA can be further increased by merging the two resonances of the two annular ring slots in the excitation patch. For TPDRAA, the measured -10 dB impedance bandwidth is from 5.65 to 6.55 GHz. The mutual coupling between the antenna elements is seen to be below -16 dB for an inter-element spacing of 4.8 mm, which is 0.090λ h . The measured gain of TPDRAA within the bandwidth is from 4.17 dBi to 5.2 dBi. The TPCFMAA can be used in 3.5 GHz Internet of Vehicles (IoV) multi-user MIMO service, whereas the TPDRAA can be used for satellite communication in the 5.925 to 6.425 GHz frequency band, WiMAX in the 5.7 to 5.85 GHz band, ISM in the 5.725 to 5.85 GHz band, and WLAN in the 5.8 GHz band.INDEX TERMS MIMO antenna, CPW-fed printed monopole antenna array, Cylindrical dielectric resonator antenna (CDRA) array, Single negative (SNG) meta-grid lines.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Space Efficient Meta-Grid Lines for Mutual Coupling Reduction in Two-Port Planar Monopole and DRA Array

et al. 2022

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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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A simple decoupling method applied in gain improvement of a planar array antenna

et al. 2023

Micro & Optical Tech Letters

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A 4 × 4 patch array antenna based on loading shorting vias is proposed in this letter. The excitation method of the array antenna adopts stripline coupling feed, leading to a strong mutual coupling between the adjacent elements. The realized gain and impedance match are deteriorated seriously. Then, eight groups of metallic vias are introduced to the array antenna. By adjusting their number and spacing, the radiation performance of the array antenna can be improved significantly. Finally, the experiment results show that the proposed array antenna resonates at 5.4 GHz. Compared with the antenna without shorting vias, one resonance point caused by the mutual coupling can be removed within 5.34 GHz to 5.46 GHz. The gain drops unexpectedly, which is improved as well.

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Isolation Enhancement for MIMO Patch Antennas Sharing a Common Thick Substrate: Using a Dielectric Block to Control Space-Wave Coupling to Cancel Surface-Wave Coupling

Cited by 59 publications

References 38 publications

Space Efficient Meta-Grid Lines for Mutual Coupling Reduction in Two-Port Planar Monopole and DRA Array

Space Efficient Meta-Grid Lines for Mutual Coupling Reduction in Two-Port Planar Monopole and DRA Array

Dual‐band stacked base station antenna array with high isolation

A simple decoupling method applied in gain improvement of a planar array antenna

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