A Compact Eighth-Mode Circular SIW Cavity-Based MIMO Antenna

Nandi, Sourav; Mohan, Akhilesh

doi:10.1109/lawp.2021.3098711

Cited by 24 publications

(19 citation statements)

References 14 publications

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“…In recent years, substrate integrated waveguide (SIW) technology [4] emerged as a new planar technology with its cost comparable to microstrip technology, at the same time offering high power handling capability [3]. In the SIW, via walls provide high isolation with other radio circuit components [3]; however, designing a compact MIMO antenna in SIW technology is challenging due to its geometrical constraints [5]. Therefore, most of the MIMO antennas are developed using microstrip technology, and very few works are reported in the literature using SIW technology [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, the sizes of the FMSIW, HMSIW, and QMSIW designs are large compared to the microstrip antennas. To the best of the authors' knowledge, limited studies [5,[17][18][19][20] are available for antenna design using EMSIW, where other reported works are MIMO designs except [19]. Four closely spaced EMSIW elements were used [17], but the gain achieved was very low (−3 dBi).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the four-element EMSIW MIMO antenna [20] reported a gain of 3.1 dBi with good isolation. At the same time, in [5] and [18], two-element EMSIW antennas were reported, operating in the sub-6 GHz band. In earlier work [5], a rectangular slot was used in the ground plane for decoupling purposes to achieve high isolation of 30 dB, and in the latter case [18], no extra decoupling network was used, and a minimum isolation of 18.5 dB was achieved.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, in [5] and [18], two-element EMSIW antennas were reported, operating in the sub-6 GHz band. In earlier work [5], a rectangular slot was used in the ground plane for decoupling purposes to achieve high isolation of 30 dB, and in the latter case [18], no extra decoupling network was used, and a minimum isolation of 18.5 dB was achieved. The SIW MIMO antennas [9][10][11][12][13][14][15][16][17][18][19][20] were developed without considering the space-constrained smartphone scenario, where edges and corners are the only space available for antenna placement [21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, keeping mutual coupling and envelope correlation coefficient (ECC) between antennas below threshold levels [30] is more challenging, especially in a multiantenna environment. The MIMO antennas utilized the SIW via walls [6,11,12], pattern diversity [9], and polarization diversity [13] to achieve isolation; however, in [5], neither via wall nor pattern or polarization diversity was used. Therefore, an extra decoupling network (DN) was employed at the cost of introducing additional design complexity.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A High-Order EMSIW MIMO Antenna for Space-Constrained 5G Smartphone

Ali

Wajid

Usman

et al. 2021

Sensors

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This paper proposes a high-order MIMO antenna operating at 3.5 GHz for a 5G new radio. Using an eighth-mode substrate integrated waveguide (EMSIW) cavity and considering a typical smartphone scenario, a two-element MIMO antenna is developed and extended to a twelve-element MIMO. These MIMO elements are closely spaced, and by employing multiple diversity techniques, high isolation is achieved without using a decoupling network. The asymmetric EMSIW structures resulted in radiation pattern diversity, and their orthogonal placement provides polarization diversity. The radiation characteristics and diversity performance are parametrically optimized for a two-element MIMO antenna. The experimental results exhibited 6.0 dB and 10.0 dB bandwidths of 250 and 100 MHz, respectively. The measured and simulated radiation patterns are closely matched with a peak gain of 3.4 dBi and isolation ≥36 dB. Encouraged with these results, higher-order MIMO, namely, four- and twelve-element MIMO are investigated, and isolation ≥35 and ≥22 dB are achieved, respectively. The channel capacity is found equal to 56.37 bps/Hz for twelve-element MIMO, which is nearly 6.25 times higher than the two-element counterpart. The hand and head proximity analysis reveal that the proposed antenna performances are within the acceptable limit. A detailed comparison with the previous works demonstrates that the proposed antenna offers a simple, low-cost, and compact MIMO antenna design solution with a high diversity performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A High-Order EMSIW MIMO Antenna for Space-Constrained 5G Smartphone

Ali

Wajid

Usman

et al. 2021

Sensors

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Multi‐mode substrate integrated waveguide broadband circularly polarized antenna array based on metasurface

Wang

Zhang

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this paper, a multi-mode substrate integrated waveguide (SIW) broadband circularly polarized antenna array based on metasurface is designed. Firstly, a half-mode SIW and a quarter-mode SIW are formed by etching slots on the top surface of the circular SIW resonant cavity antenna respectively. While miniaturizing the antenna using the multi-mode feature, the antenna bandwidth is expanded by 5.1%. Secondly, the introduction of metasurface further enhances the overall performance of the antenna sub-array and the bandwidth is increased by 1.8% while the gain is 1 dBi. A 2 Â 2 array is designed to verify the accuracy of the design, and a sequential rotating feed network was used to enhance the circular polarization characteristics. The final antenna size is 1.04 Â 1.04 Â 0.08λ 0 , which achieves 15.4% (4.46-5.2 GHz) operating bandwidth, 9.1% (4.55-4.98 GHz) axial ratio bandwidth, and maximum gain of 11.42 dBi in the operating band. The simulated results and measured results agree well which show the validity of the design.

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Compact substrate‐integrated waveguide filtering multiple‐input multiple‐output magnetic dipole antenna with high selectivity and high isolation

Xiao

2023

Micro & Optical Tech Letters

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A compact substrate‐integrated waveguide (SIW) filtering multiple‐input multiple‐output magnetic dipole antenna with high selectivity and high isolation is proposed. Each filtering antenna element contains a SIW cavity, a half‐mode SIW cavity, and a magnetic dipole antenna with backed ground. Meanwhile, the SIW cavity and the half‐mode SIW cavity are vertically connected through magnetic coupling, and second‐order filtering frequency responses can be obtained. Owing to the cross‐coupling between the feeding line and antenna, two radiation nulls can be created to realize high selectivity. Based on the radiation mechanism of the magnetic dipole antenna and polarization diversity, high isolation can be obtained. The measured isolation and the envelope correlation coefficient are greater than 24 dB and less than 0.004, respectively.

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A Compact Eighth-Mode Circular SIW Cavity-Based MIMO Antenna

Cited by 24 publications

References 14 publications

A High-Order EMSIW MIMO Antenna for Space-Constrained 5G Smartphone

A High-Order EMSIW MIMO Antenna for Space-Constrained 5G Smartphone

Multi‐mode substrate integrated waveguide broadband circularly polarized antenna array based on metasurface

Compact substrate‐integrated waveguide filtering multiple‐input multiple‐output magnetic dipole antenna with high selectivity and high isolation

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