Broadband omnidirectional patch antenna with horizontal gain enhanced by near‐zero‐index metamaterial cover

Guo, Yujin; Jing, Zhao; Hou, Quanwen; Zhao, Xiaopeng

doi:10.1049/iet-map.2019.0806

Cited by 16 publications

(12 citation statements)

References 26 publications

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“…The comparison of Antenna 2a and 2b with other works in publications is illustrated in Table 3. We can conclude from the [15] and the size of our antenna is larger, but our antenna has great advantage in profile compared with these antennas. When compared with other antennas, the horizontal gain of Antenna 2b is maximum.…”

Section: Comparison and Discussion Of The Measured Resultsmentioning

confidence: 80%

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High‐gain omnidirectional patch antenna for conformal application based on near‐zero‐index metamaterials

Zhang

Jing

Guo

et al. 2021

IET Microwaves Antenna & Prop

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Achieving a high-gain omnidirectional patch antenna with low profile is a challenging task. On the basis of improving antennas by metamaterials, a broadband near-zero-index metamaterial (NZIM) is designed to enhance the horizontal gain of the omnidirectional patch antenna. The zero-index metamaterial is loaded on the substrate of three antennas with different working bands (4.99-5.50 GHz). The results show that the horizontal gain of antennas is enhanced by more than 0.6 dB at various frequencies. The roundness of antennas is also optimised. Therefore, using NZIM can increase the horizontal gain with a low profile (λ/30) structure size. The low profile, high-gain omnidirectional patch antenna has great potential in the conformal field.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Comparison and Discussion Of The Measured Resultsmentioning

confidence: 80%

“…NZIM metamaterials are rarely used to increase the horizontal gain of the omnidirectional antenna. We have successfully improved the gain of omnidirectional antenna by applying epsilon-negative metamaterial (ENG) or NZIM covers in the previous works [14,15]. However, the problem of profile is not well solved.…”

Section: Introductionmentioning

confidence: 99%

High‐gain omnidirectional patch antenna for conformal application based on near‐zero‐index metamaterials

Zhang

Jing

Guo

et al. 2021

IET Microwaves Antenna & Prop

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“…It is observed that bandwidth is decreased for the antenna with MTM with a downward shift of upper cutoff frequency. It can be explained by using the impedance matching of the equivalent circuit of the antenna as impedance, Z and frequency, f of resonance can be expressed 51 as, and respectively, in which L corresponds to total inductance and C is the capacitance. Introducing the MTM with antenna causes a modification of the total capacitance, thus resonance frequency shifts.…”

Section: Gain Enhancement Of Antenna Using Mtm Superstrate With Antennamentioning

confidence: 99%

Gap coupled symmetric split ring resonator based near zero index ENG metamaterial for gain improvement of monopole antenna

Moniruzzaman

Islam

Samsuzzaman

et al. 2022

Sci Rep

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In this article, a symmetric split ring resonator (SRR) based metamaterial (MTM) is presented that exhibits three resonances of transmission coefficient (S21) covering S, C, and X-bands with epsilon negative (ENG) and near zero index properties. The proposed MTM is designed on an FR4 substrate with the copper resonator at one side formed with two square rings and one circular split ring. The two square rings are coupled together around the split gap of the outer ring, whereas two split semicircles are also coupled together near the split gaps. Thus, gap coupled symmetric SRR is formed, which helps to obtain resonances at 2.78 GHz, 7.7 GHz and 10.16 GHz with desired properties of the MTM unit cell. The MTM unit cell's symmetric nature helps reduce the mutual coupling effect among the array elements. Thus, different array of unit cells provides a similar response to the unit cell compared with numerical simulation performed in CST microwave studio and validated by measurement. The equivalent circuit is modelled for the proposed MTM unit cell in Advanced Design System (ADS) software, and circuit validation is accomplished by comparing S21 obtained in ADS with the same of CST. The effective medium ratio (EMR) of 10.7 indicates the compactness of the proposed MTM. A test antenna is designed to observe the effect of the MTM over it. Numerical analysis shows that the proposed MTM have an impact on the antenna when it is used as the superstrate and helps to increase the gain of the antenna by 95% with increased directivity. Thus, compact size, high EMR, negative permittivity, near zero permeability and refractive index makes this MTM suitable for S, C and X band applications, especially for antenna gain with directivity enhancement.

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“…33 b. Thus, MTM cover helps to increase horizontal electromagnetic wave, which in turn enhance horizontal gain due to the change of direction of the main beam 53 . 3D far-field radiation pattern is presented in Fig.…”

Section: Application: Gain Enhancement Of Tapered Log Periodic Dipole(tlpd) Antenna Using An Array Of Proposed Mtmmentioning

confidence: 99%

Inductively tuned modified split ring resonator based quad band epsilon negative (ENG) with near zero index (NZI) metamaterial for multiband antenna performance enhancement

Moniruzzaman

Islam

Misran

et al. 2021

Sci Rep

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An inductively tuned modified split-ring resonator-based metamaterial (MTM) is presented in this article that provides multiple resonances covering S, C, X, and Ku-bands. The MTM is designed on an FR-4 substrate with a thickness of 1.5 mm and an electrical dimension of 0.063λ × 0.063λ where wavelength, λ is calculated at 2.38 GHz. The resonator part is a combination of three squared copper rings and one circular ring in which all the square rings are modified shaped, and the inner two rings are interconnected. The resonance frequency is tuned by adding inductive metal strips in parallel two vertical splits of the outer ring that causes a significant shift of resonances towards the lower frequencies and a highly effective medium ratio (EMR) of 15.75. Numerical simulation software CST microwave studio is used for the simulation and performance analysis of the proposed unit cell. The MTM unit cell exhibits six resonances of transmission coefficient (S21) at 2.38, 4.24, 5.98, 9.55, 12.1, and 14.34 GHz covering S, C, X, and Ku-bands with epsilon negative (ENG), near-zero permeability, and near-zero refractive index (NZI). The simulated result is validated by experiment with good agreement between them. The performance of the array of the unit cells is also investigated in both simulation and measurement. The equivalent circuit modeling has been accomplished using Advanced Design Software (ADS) that shows a similar S21 response compared to CST simulation. Noteworthy to mention that with the copper backplane, the same unit cell provides multiband absorption properties with four major absorption peaks of 99.6%, 95.7%, 99.9%, 92.7% with quality factors(Q-factor) of 28.4, 34.4, 23, and 32 at 3.98, 5.5, 11.73 and 13.47 GHz, respectively which can be applied for sensing and detecting purposes. The application of an array of the unit cells is investigated using it as a superstrate of an antenna that provides a 73% (average) increase of antenna gain. Due to its simple design, compact dimension with high EMR, ENG property with near-zero permeability, this multiband NZI metamaterial can be used for microwave applications, especially for multiband antenna gain enhancement.

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Broadband omnidirectional patch antenna with horizontal gain enhanced by near‐zero‐index metamaterial cover

Cited by 16 publications

References 26 publications

High‐gain omnidirectional patch antenna for conformal application based on near‐zero‐index metamaterials

High‐gain omnidirectional patch antenna for conformal application based on near‐zero‐index metamaterials

Gap coupled symmetric split ring resonator based near zero index ENG metamaterial for gain improvement of monopole antenna

Inductively tuned modified split ring resonator based quad band epsilon negative (ENG) with near zero index (NZI) metamaterial for multiband antenna performance enhancement

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