Improvement of the gain and the axial ratio of a circular polarization microstrip antenna by using a metamaterial superstrate

Dehnavi, Mahboubeh Safari; Razavi, S.M.J.; Armaki, S. H. Mohseni

doi:10.1002/mop.31886

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…Table 2 summarizes the key performance indicators of recently reported CP antennas based on metasurfaces for comparison. It can be seen that both the S 11 bandwidth and ARBW of the proposed CP metasurface antenna are much wider than those of the designs in [8][9][10][11]20]. Moreover, the size of the proposed antenna is much smaller in comparison.…”

Section: Measured Results Analysismentioning

confidence: 89%

“…A metasurface with a unit cell consisting of five horizontal strips and a single diagonal strip realized the conversion from LP waves to CP waves [9], while a metasurface with square rings and splits achieved circular polarization and high gain [10]. By putting a double-stacked metasurface layer over a CP microstrip antenna, the ARBW was increased by 3% [11]. However, the sizes of the above designs were large, and their S 11 bandwidth and ARBW were narrow, which limited the use of these antennas.…”

Section: Introductionmentioning

confidence: 99%

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A Low-Profile Wideband Linear-to-Circular Polarization Conversion Slot Antenna Using Metasurface

Dong

Ding

2020

Materials

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A new low-profile wideband linear-to-circular polarization conversion microstrip slot antenna based on a metasurface for C-band satellite communication applications is proposed in this paper. The metasurface basically consists of four unit cells with parasitic square cross gaps arranged in a 2 × 2 layout. By loading the metasurface on the microstrip slot antenna, linearly polarized (LP) waves from the source antenna are converted into circularly polarized (CP) waves. Then, by etching three more parasitic square cross gaps in the middle of the metasurface, enhanced impedance bandwidth and axial ratio bandwidth (ARBW) are achieved. Furthermore, an equivalent circuit and a phase analysis are presented to explain how a wide ARBW is realized by the metasurface. A final model with an overall size of 36 × 36 × 3.5 mm3 (approximately 0.65λ0 × 0.65λ0 × 0.06λ0 at 5.5 GHz) was designed and fabricated. The measured S11 bandwidth and 3 dB ARBW were 39.25% from 4.28 GHz to 6.37 GHz and 17.77% from 5.18 GHz to 6.19 GHz, respectively. As a result, the proposed antenna shows great potential for satellite communication applications due to its low profile and compact structure, wide impedance bandwidth, and wide axial ratio bandwidth.

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Section: Measured Results Analysismentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

A Low-Profile Wideband Linear-to-Circular Polarization Conversion Slot Antenna Using Metasurface

Dong

Ding

2020

Materials

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“…The array has an AR bandwidth of 4.3 GHz from 3 to 7.3 GHz which is wider than AR bandwidth reported in refs. [2–8]. The gain was measured using the comparison method where the power of reference horn antenna and antenna under test were calculated separately.…”

Section: Measured Resultsmentioning

confidence: 99%

“…Among the general methods to feed the CP array antenna, sequentially rotation method (SRM) has been shown in refs. [3][4][5][6][7][8][9][10][11] to be effective for improving the polarisation purity and symmetrical radiation patterns over the operational frequency range of the array. Different methodologies have been reported in literature of realising broadband CP antennas which include: (1) loading coplanar waveguide (CPW) fed square aperture antenna with U-shape strip [2][3][4][5]; (2) applying slots on the grounded strips [3][4][5][6]; and (3) etching a modified T-shaped patch inserted diagonally with respect to the slot [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Novel antenna array configuration using miniature double box branch‐line couplers for wideband circularly polarised applications

Virdee,

Aribi,

Sedghi

2023

IET Microwaves Antenna & Prop

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This article presents a wideband circularly polarised (CP) antenna array using a miniaturised double box branch‐line coupler. This was achieved by creating a slow wave structure by introducing open‐circuit stubs on the inside arms of the branch‐line coupler. The 2 × 2 antenna array is made of four CP slot radiating elements excited through 1 × 4 feeding network. Moreover, sequentially rotation method is used to increase the axial‐ratio (AR) bandwidth of the array. The CP slot radiating element is fed by coplanar waveguide. The feedline of the horn‐shaped radiator includes a circular matching stub. Ground connected asymmetric T‐shaped stub, a pair of grounded L‐shaped square strips, and single strip line are shown to induce CP and enhance the antenna's 3 dB impedance bandwidth and AR performance. The antenna constituting the array has impedance bandwidth of 2.45 GHz from 4.8 to 7.25 GHz that corresponds to a fractional bandwidth of 40%, and its 3 dB AR extends between 4.8 and 6.25 GHz. Compared to a conventional double‐box branch‐line coupler the size of the proposed coupler is reduced by 35% by increasing the capacitance of the coupler's arms. This also is shown to increase the impedance bandwidth of the coupler. A 2 × 2 array was fabricated, and its performance verified. Measured results confirm the proposed antenna array exhibits CP covering the bands of WiMAX IEEE 802.16, C‐band and ITU‐R F386.9. The measured 3 dB AR bandwidth of the antenna array extend from 3 to 7.3 GHz and its impedance bandwidth extends from 3.2 to 9.0 GHz. The antenna array radiates with a peak gain of 11.5 dBic.

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“…1 More recently, there has been growing interest in the metasurface (MS), which is the two-dimensional counterpart of metamaterials. [2][3][4] Because of its significant advantages in electromagnetic wave controls, the MS has been widely adopted to improve the antenna performances, such as bandwidth expansion, 5,6 polarization conversion, [7][8][9][10] gain enhancement, [11][12][13] and so forth.…”

Section: Introductionmentioning

confidence: 99%

Low‐profile high‐gain broadband circularly polarized slot antenna with RCS reduction using polarization conversion metasurface

Deng

Zhang

Ding

et al. 2022

Micro & Optical Tech Letters

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A novel design of circularly polarized broadband slot antenna with high gain, low profile, and low radar cross‐section (RCS) is proposed by employing polarization conversion metasurface (MS). By introducing sawtooth corner‐truncated square MS with diagonal gaps, a compact circularly polarized antenna composed of 4 × 4 unit cells is presented. It is found that a smaller MS slot antenna can achieve an impedance bandwidth of 42.9% (3.7–5.72 GHz) and a 3‐dB axial ratio (AR) bandwidth of 22.8% (4.55–5.72 GHz). Simultaneously, the MS can realize polarization conversion. The MS and its orthogonal units were arranged in a chessboard‐type pattern and applied as the radiator of a larger MS slot antenna, which was fed by a sequentially rotated feeding network. In addition, owing to the anti‐phase cancellation and scattering, the 5‐dB average RCS reduction can be obtained within the frequency range from 3.8 to 6.9 GHz. For verification, the proposed larger circularly polarized antenna was fabricated and tested. The operating bandwidth was measured as 44% (3.78–5.91 GHz) with a 3‐dB AR bandwidth of 39.6% and a high gain of 10.3 dBic. Furthermore, the larger antenna produces a useful RCS reduction from 3.7 to 6.7 GHz. The simulated and measured results are in good agreement.

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Improvement of the gain and the axial ratio of a circular polarization microstrip antenna by using a metamaterial superstrate

Cited by 14 publications

References 15 publications

A Low-Profile Wideband Linear-to-Circular Polarization Conversion Slot Antenna Using Metasurface

A Low-Profile Wideband Linear-to-Circular Polarization Conversion Slot Antenna Using Metasurface

Novel antenna array configuration using miniature double box branch‐line couplers for wideband circularly polarised applications

Low‐profile high‐gain broadband circularly polarized slot antenna with RCS reduction using polarization conversion metasurface

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