<scp>Three‐port</scp> circularly polarized <scp>MIMO</scp> antenna for <scp>WLAN</scp> application with pattern and polarization diversity

Jaiswal, Rahul Kumar; Kumari, K. Nalini; Sim, Chow‐Yen‐Desmond; Srivastava, Kumar Vaibhav

doi:10.1002/mop.32847

Cited by 14 publications

(3 citation statements)

References 17 publications

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“…Diversity parameters such as ECC (< 0.2), DG (> 9.6 dB), and mean effective gain (MEG = ± 0.3 dB) were observed to fall within satisfactory ranges; but the gain was low and only a layer of textile was used [24]. All the presented MIMO antennas in [14][15][16][17][18][19][20][21][22][23][24][25][26][27] were designed on either only rigid or textile substrates. There were also low gains and efficiency, with relatively larger sizes than their operating frequency and covering only a single or two bands.…”

Section: Introductionmentioning

confidence: 99%

Enhancing connectivity/mobility in WBAN applications through detachable wearable multi-band MIMO antenna

Saeidi,

Saleh,

Timmons

et al. 2024

Phys. Scr.

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The connectivity and mobility of a miniaturized multi-band four-port textile leaky wave multiple-input multiple-output (MIMO) antenna designed on a layer of denim (εr = 1.6, tanδ = 0.006) is enhanced by integrating it with two detachable spiral buttons designed on circular PTFE substrate (εr = 2.1, tanδ = 0.001). The connectivity and mobility enhancement of the proposed antenna is evaluated in terms of radiation and diversity parameters. Nested hexagonal split rings behind the buttons, U-shaped slots on textiles, a comb-shaped neutralization network, and an aperture-coupled feed technique are utilized. The unique structure of the buttons on a rigid substrate and the leaky wave antenna on the textile and their integration, the periodic nested elliptical and circular split ring resonators (CSRRs) slots on the aperture coupled to ground, are to expand the connectivity and mobility of the proposed MIMO antenna by offering multiple bands, higher isolation, broadside radiation, and low specific absorption rate (SAR). The leaky wave and button antennas have dimensions of 40 × 30 × 1 mm3 and a diameter of only 13 mm, respectively. The operational bands are 0.86–2.75 GHz, 2.9–4.85 GHz, 5.75–6.15 GHz, and 8–9.85 GHz, covering the L, C, S, and X bands. Additionally, diversity performance is evaluated by defining the envelope correlation coefficient (ECC), diversity gain (DG), Channel Capacity Loss (CCL), and mean effective gain (MEG). The simulation and measurement findings are in good agreement. Following that, it offers a maximum gain of 8.25 dBi, low SAR (<0.05), an ECC below 0.05, DG above 9.85 dB, CCL< 0.25 bits/s/Hz, MEG <−3 dB, Circular polarization (CP), and strong isolation (>22 dB) between every two ports. These features make the proposed antenna an ideal option for MIMO communications and suitable for wireless local area network (WLAN) and fifth-generation (5G) communications.

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Section: Introductionmentioning

confidence: 99%

Enhancing connectivity/mobility in WBAN applications through detachable wearable multi-band MIMO antenna

Saeidi,

Saleh,

Timmons

et al. 2024

Phys. Scr.

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“…These techniques include polarization diversity, 2–4 electromagnetic bandgap structures, neutralization line, 5 defected ground structures (DGS), 6 placement of absorbers between antennas, 7 feed‐forward loop with phase shifter and attenuator, 8 circulator, 9 circular array, 10 wavetraps, 180° hybrid, 11,12 phase shifter and power divider 13,14 filter, 15 reflective terminal 16 . Among the above reported techniques, pattern/polarization diversity, 2 neutralization line, 5 DGS 6 are widely used in multiple input multiple output (MIMO) antenna. Using these techniques, reported isolation level for single‐band is 20, 2 15, 5 and 20 dB 6 .…”

Section: Introductionmentioning

confidence: 99%

“…Among the above reported techniques, pattern/polarization diversity, 2 neutralization line, 5 DGS 6 are widely used in multiple input multiple output (MIMO) antenna. Using these techniques, reported isolation level for single‐band is 20, 2 15, 5 and 20 dB 6 . A loop‐slot planar antenna 3 and a patch with layered configuration 4 is used to get dual‐ band dual polarization behavior.…”

Section: Introductionmentioning

confidence: 99%

An in‐band full‐duplex antenna for dual‐band application

Kumari

Jaiswal

Srivastava

2021

Micro & Optical Tech Letters

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A dual‐band, dual‐polarized in‐band full‐duplex antenna with good isolation performance is presented for wireless local area network (WLAN) applications. A neutralization line is connected between the grounds of the transmitter (Tx) and receiver (Rx) antennas to enhance the isolation. Further enhancement in isolation is achieved by using a 180° ring hybrid coupler between receiving antenna elements. Here the dual‐band monopole antennas are used as transmitting and receiving antenna elements. For better isolation, the receiving antenna elements are placed opposite to each other and fed through the differential ports of the 180° ring hybrid coupler. The proposed structure is fabricated, and the comparison of measured results and simulated results are studied. The simulated and measured impedance bandwidths (≤−10 dB) of the antenna cover the entire 2.4 GHz WLAN band (2.4–2.48 GHz), and for this band, the measured isolation is better than 40 dB. For the higher band, the measured isolation is more than 40 dB for 200 MHz (5.15–5.35 GHz) of bandwidth. The simulated radiation patterns of the antenna are well‐matched with the measured patterns at both the frequencies.

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Wideband low‐profile endfire circularly polarized antenna using mode superposition technique

Jaiswal

Ojha

Kumari

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this article, a wideband low-profile endfire circularly polarized (CP) antenna using magnetoelectric dipole is proposed. Designing a wideband electric dipole element is easy and well-studied in the literature. However, designing a compact wideband magnetic dipole element is still a challenge. In this paper, the impedance bandwidth (IBW) of the magnetic dipole is enhanced by reducing the resonance frequency of higher-order mode half-TE 310 with the help of rectangular slots placed at the null of mode half-TE 310 . By combining the resonance frequency of mode half-TE 110 and mode half-TE 310 , the magnetic dipole can yield a larger IBW (6.86-7.67 GHz, 11.14%) with smaller planar dimensions of 1.259λ 0 Â 0.363λ 0 Â 0.038λ 0 (λ 0 is the free space wavelength at the centre frequency). To generate a wideband endfire CP wave, a horizontally polarized electric dipole with a feed line is combined with the vertically polarized magnetic dipole. The measured IBW and axial ratio bandwidth (ARBW) are 11.65% and 12.02%, respectively, with a measured peak endfire gain of 5 dBic. The overall dimension of the proposed wideband lowprofile endfire CP antenna is 1.11λ 0 Â 0.66λ 0 Â 0.033λ 0 .

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Three‐port circularly polarized MIMO antenna for WLAN application with pattern and polarization diversity

Cited by 14 publications

References 17 publications

Enhancing connectivity/mobility in WBAN applications through detachable wearable multi-band MIMO antenna

Enhancing connectivity/mobility in WBAN applications through detachable wearable multi-band MIMO antenna

An in‐band full‐duplex antenna for dual‐band application

Wideband low‐profile endfire circularly polarized antenna using mode superposition technique

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