Compact Wideband Quad-Element Mimo Antenna With Reversed S-Shaped Walls

Wang, Fei; Li, Shifeng; Zhou, Qing; Gong, Yandao

doi:10.2528/pierm19010201

Cited by 7 publications

(8 citation statements)

References 22 publications

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“…A central metallic reflector has been placed in the center of two groups of four‐elements of dielectric resonator antennas (DRAs) (Sharawi et al., 2017), as represented in Figure 16b for isolation and tilting the radiation pattern of one group resonating at 5.8 GHz by 45° as compared to another group resonating at 2.45 GHz. Similarly, a simple metallic strip (Roshna et al., 2015), T‐shaped parasitic strip (Kang et al., 2015), a modified interdigital capacitor (Kumar et al., 2018b), a novel ITI‐shaped parasitic structure (Kumar et al., 2019a), parasitic inverted L‐element with an open stub (Lee et al., 2012), H‐shaped strip (Li et al., 2016), floating parasitic decoupling structure (Khan et al., 2014), a rotated “+” shaped rectangular strip pair (Singhal, 2019) as represented in Figure 17a, a rectangular parasitic element is embedded at the substrate backside (Hatami et al., 2019), two separate rectangular shapes and T‐shaped parasitic elements (Faraz et al., 2019), as represented in Figure 17b, cross‐shaped metallic fence (Caizzone, 2017), stepped cross‐shaped reflector strip (Thummaluru et al., 2019), a circular parasitic element at the backside of the radiating patch (Ghimire et al., 2019), a novel reversed S‐shaped walls (Wang et al., 2019), a decoupling metal strip loaded with an inductor (Nie et al., 2019), an optimized parasitic element (Addaci et al., 2012) as represented in Figure 18a, slotted meander‐line resonator (SMLR) (Alsath et al., 2013) as represented in Figure 18b, a simple rectangular parasitic structure at the back (Azarm et al., 2019), diagonal parasitic strip at the back (Chouhan et al., 2019), Minkowski fractal‐shaped isolators (Debnath et al., 2018) as represented in Figure 19a, a complementary pattern (CP) comprised of meandered transmission lines (Hwang et al., 2010), a group of six parasitic elements (Min et al., 2005), as represented in Figure 19b, two parallel strips, or a single strip embedded with patterned meander‐shaped slot (Isaac et al., 2018) as represented in Figures 20a and 20b, two parasitic monopole providing a decoupling path (Li et al., 2012) as represented in Figure 21a, a novel H‐shape parasitic element embedded in the ground plane (Liu et al., 2018) as represented in Figure 21b, a T‐shaped coupling eleme...…”

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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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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“…Electronics 2020, 9, x 12 of 17 The TARC is a measure of diversity array efficiency which involves the effects of mutual coupling [38,47,48]. The TARC can be evaluated by using Equation ( 7 The measured TARC from the reflection coefficient was less than −15.5 dB (as shown in Figure The measured apparent diversity gain for the proposed antenna, calculated using the S-parameter for all frequencies, was greater than 9.9 dB, as depicted in Table 2.…”

Section: Performance Metrics Of the Proposed Diversity Antennamentioning

confidence: 99%

“…The TARC is a measure of diversity array efficiency which involves the effects of mutual coupling [38,47,48]. The TARC can be evaluated by using Equation ( 7 The measured TARC from the reflection coefficient was less than −15.5 dB (as shown in Figure 10), showing that the diversity array efficiency was not affected significantly due to the high isolation factor of the antennas in the diversity set.…”

Section: Performance Metrics Of the Proposed Diversity Antennamentioning

confidence: 99%

“…The TARC can be evaluated by using Equation ( 7 The measured TARC from the reflection coefficient was less than −15.5 dB (as shown in Figure 10), showing that the diversity array efficiency was not affected significantly due to the high isolation factor of the antennas in the diversity set. The TARC is a measure of diversity array efficiency which involves the effects of mutual coupling [38,47,48]. The TARC can be evaluated by using Equation ( 7):…”

Section: Performance Metrics Of the Proposed Diversity Antennamentioning

confidence: 99%

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On the Design and Analysis of Compact Super-Wideband Quad Element Chiral MIMO Array for High Data Rate Applications

et al. 2020

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This paper presents a compact, bouquet-inspired, four-element MIMO array for super wideband (SWB) applications. The proposed unit element monopole antenna has compact geometry, and it is deployed by the fusion of an elliptical and circular-shaped radiator. The convoluted geometry and semi-elliptical ground plane, along with the narrow rectangular slit defected ground structure, provides a wide impedance bandwidth. The designed unit cell has the dimensions of 32 mm × 20 mm × 0.8 mm, operates from 2.9 to 30 GHz (S11 ≤ −10 dB) and provides a bandwidth dimension ratio (BDR) of 2894. The proposed low-profile diversity array without any decoupling structures consists of four orthogonally placed, uncorrelated antennas with an inter element spacing of 0.05 λ0, occupies an area of 57 mm × 57 mm and provides dual polarization. The performance metrics of the diversity array were validated for frequencies over ultra-wideband, using mutual coupling characteristics, envelope correlation coefficient (ECC) by far-field radiation, diversity gain (DG), total active reflection coefficient (TARC), channel capacity loss (CCL) and cumulative distribution function (CDF) analysis. The measured mutual coupling over the operating band was less than −18 dB, the ECC was less than 0.004 and the TARC was less than −15 dB, and a better CCL of ˂0.28 bits/s/Hz was achieved by the fabricated antenna.

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“…Equations (1) and (2) show the definition of the voltage and current vectors at the aforementioned ports:…”

Section: Decoupling and Matching Network (Dmn)mentioning

confidence: 99%

Decoupling and Matching Strategies for Compact Antenna Arrays

Pereira

Nossek

Cavalcanti

2020

JCIS

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Since the MIMO technology presents antenna arrays that can be formatted with tens to hundreds antenna elements, several effects arise due to this array structure, such as mutual coupling and impedance matching among antenna elements in the array. The treatment of these issues seeks to solve problems such as the performance degradation of communication systems. In this context, this paper proposes and evaluates three strategies of joint decoupling and impedance matching networks (DMN) for antenna arrays. The first method, called DMN with Lumped Elements (DMN-LE), performs the decoupling and impedance matching steps with capacitors and inductors. The second method, called DMN with Ring Hybrid (DMN-RH), utilizes a microstrip line in a ring format. The third method, called Networkless Decoupling and Matching (NDM), brings a concept of decoupling without the presence of a network itself, which enables modeling an antenna array that performs DMN operations in a simplified and compact manner. A comparison of the methods is performed both analytically and via computer simulations. The figure-of-merit for this comparison is the antenna bandwidth, for which both matching and decoupling are measured against S-parameters below a given threshold. We conclude that the third method is a promising new alternative approach.

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Compact Wideband Quad-Element Mimo Antenna With Reversed S-Shaped Walls

Cited by 7 publications

References 22 publications

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

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

On the Design and Analysis of Compact Super-Wideband Quad Element Chiral MIMO Array for High Data Rate Applications

Decoupling and Matching Strategies for Compact Antenna Arrays

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