Design of High-Isolation Wideband Dual-Polarized Compact MIMO Antennas With Multiobjective Optimization

Lu, Diqun; Wang, Lu; Yang, Erfu; Wang, Gang

doi:10.1109/tap.2017.2784446

Cited by 44 publications

(25 citation statements)

References 24 publications

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“…For reducing mutual coupling of MIMO antennas, various optimization methods have also been used, including optimizing both antenna elements [16] and isolation structures [17]- [20]. In [17] and [18], fragment-type isolation structures were optimized by multi-objective evolutionary algorithm based on decomposition for single-polarized MIMO antenna and orthogonally polarized MIMO antenna. In [20], a dual-layer isolation structure was optimized for a single-polarized MIMO antenna by a hybrid topology optimization method.…”

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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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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…A fragmented type ground plane (Wang et al., 2014) as represented in Figure 4c, a modified dumbbell‐shaped DGS (Numan et al., 2013), three rectangular slots etched in the ground plane (Irene & Rajesh, 2018a, 2018b), Y‐shaped DGS (Zhu et al., 2016), partially connected two rectangular slots in one case, while two crossed rectangular slots in another trial (Ghouz, 2015), modified π‐shaped strip and two shorted T‐shaped strips (Wu et al., 2019) as represented in Figure 5a, a funnel‐shaped ground plane with an open‐ended slot (Gautam et al., 2019) as depicted in Figure 5b, dumbbell‐shaped modified CSSR DGS (Kumar et al., 2020b), as represented in Figure 5c, T‐stub loaded DGS (Y et al., 2020), U‐shaped modified ground plane embedded with T‐shaped slot (Li et al., 2019), a novel fractal DGS (FDGS) (Wei et al., 2016a) as represented in Figure 6a, partially stepped ground (PSG) (Malviya et al., 2016b), H‐dumbbell‐shaped DGS (Abbosh, 2007; Acharjee et al., 2018) shown in Figure 6b, a ladder‐shaped modified ground plane (Asghar et al., 2018) shown in Figure 6c, compact DGS filtering structure (Abdalla & Ibrahim, 2013), square ring DGS (Anitha et al., 2014), meandered DGS (Chen & Chang, 2016; Dhar & Sharawi, 2014), different shapes of DGSs (Elsheakh et al., 2010) as represented in Figure 7, slotted ground plane (Abid et al., 2018), two columns of folded split‐ring resonator (FSRR) etched in the ground plane Habashi et al. (2011) as represented in Figure 8a, annular slots etched DGS (Hussain et al., 2018), a λ /4 stub filter along with supplemental ground structure (Kim et al., 2008), fragmented structured DGS (Lu et al., 2018), shorted meandered line type DGS (Li et al., 2018) as represented in Figure 8b, forked shaped etched slot DGS (Singh et al., 2015), S‐shaped periodic DGS (Wei et al., 2016b) as depicted in Figure 8c, another periodic spiral‐shaped DGS (Wei et al., 2017) and slotted CSRR etched DGS (Yang et al., 2014) have been used in the existing literature to isolate the elements of the tightly packed MIMO antenna.…”

Section: Isolation Techniques Discussionmentioning

confidence: 99%

A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures

et al. 2021

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With the advancement in the high data rates wireless transmission, the demand for high channel capacity planar antennas, especially for handheld devices, has shown a significant market. Multiple-Input-Multiple-Output (MIMO) antennas can fulfill the top requirement. MIMO antenna helps in increasing data throughput and link coverage without sacrificing additional bandwidth or increased transmit power (Kumar et al., 2018a, 2018b). The MIMO antenna's other advantages are: high data throughput and link range without additional spectrum requirement, increased transmit power, spatial diversity and pattern diversity, and less signal dropout (Kumar et al., 2019a). In MIMO, multiple antennas radiate simultaneously and act as a transmitter or receiver depending upon its purpose. Multiple antennas placed on a single substrate sharing at least one standard radiating frequency will be considered an MIMO antenna. The MIMO antenna should have a common ground, easing the integration with monolithic integrated circuits (ICs) (Kumar et al., 2020a). However, sometimes the MIMO antenna does not have a common ground plane, but such cases should be avoided for better integration purposes and standard voltage levels. MIMO antenna should be more compact to have a reduced form factor. The MIMO antenna's compactness is another primary concern when multiple antennas are placed on a single substrate. If the antenna element spacing is less than the λ 0 /2, i.e., half of the free-space wavelength, then the antenna suffers from the surface wave and the space wave coupling effect between the antenna elements (Dama et al., 2011). For that reason, as the compactness increases, the chances of MC effect increase, resulting in degradation in the MIMO antenna performance due to power losses in a rich scattering environment. Therefore, an effective isolation technique is a must in the design of a compact MIMO antenna. Besides this, pattern and spatial diversity

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“…The proposed method is flexible and can be readily applied to the design of planar MIMO antennas under a variety of geometric and performance constraints. Though other optimization techniques for MIMO antennas have been proposed [20][21][22], these other methods must assume an initial antenna shape or feed position. The systematic design process described here does not make these assumptions and so provides many more degrees of freedom in both antenna shape and feed placement while reducing the time that would normally be required for a direct search of the design space by dividing the optimization into two sequential steps.…”

Section: Discussionmentioning

confidence: 99%

A Shape-First, Feed-Next Design Approach for Compact Planar Mimo Antennas

Yang¹,

Zhou²,

Adams³

2019

PIER M

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Employing characteristic mode theory (CMT), a shape-first feed-next design methodology for compact planar antennas is proposed, which facilitates rapid and systematic design of self-matched, multi-port antennas with optimal bandwidth and high isolation. First, the optimal antenna shape with multiple self-resonant modes is synthesized using a binary genetic algorithm. Then, the optimal feed positions that provide good input matching and high isolation between the excitation ports are specified using a virtual probe modeling technique. A two-port microstrip antenna with an electrical size of 0.45λ d × 0.297λ d is designed, fabricated and measured. The measured operating frequency is within 1% of the full wave simulation, and the overall S parameter characteristics and far field patterns agree well with the simulation result, validating our design methodology. Mutual coupling S 21 < −35 dB at the center frequency is achieved in this design.

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Design of High-Isolation Wideband Dual-Polarized Compact MIMO Antennas With Multiobjective Optimization

Cited by 44 publications

References 24 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

A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures

A Shape-First, Feed-Next Design Approach for Compact Planar Mimo Antennas

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