A novel wide beamwidth and circularly polarized microstrip antenna loading annular dielectric superstrate with metal ring

Tan, Tianshuang; Xia, Yulong; Zhu, Qi

doi:10.1109/aps.2014.6905268

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…However, these CP antennas suffered from certain difficulties in manufacturing the ground and assembling them with the basic CP radiator in addition to bulky geometry. Later on, parasitic square rings [7]- [10], circle rings [11], or metal cylinders [12] were introduced above or around a CP radiator to make the AR beamwidth wide. Unfortunately, this approach enlarged the overall size and increased the complexity of the entire CP antennas.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Wide-Beamwidth Circularly Polarized Planar Antenna via Two Pairs of Folded Dipoles in a Square Contour

Luo

Chu

2015

IEEE Trans. Antennas Propagat.

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A circularly polarized (CP) antenna with a wide axial-ratio (AR) beamwidth is presented by placing the two pairs of folded dipoles in a square contour. First, our study demonstrates that the CP radiation can be achieved at the broadside by setting a 90 • phase difference between the vertical-and horizontal-paired folded dipole radiators. Second, a radiation pattern subtraction approach is presented to explain how the radiation beamwidth of the paired folded dipoles could be appropriately widened or narrowed according to the radiation pattern subtraction of two opposite electric current densities in the folded dipoles. Using this approach, the E-plane beamwidth of a pair of folded dipoles is made certainly widened, whereas its H-plane counterpart becomes narrowed. On this basis, the Eand H-plane radiation patterns can still be made approximately identical with each other over a wide range of polar angle, even though the distance between dipoles is deliberately shortened. As such, the desired CP antenna with shortened dipole-to-dipole distance and unaffected wide AR beamwidth can be achieved using two pairs of parallel folded dipoles with shortened distance between them instead of linear dipoles in [24]. Finally, a CP printed antenna is designed and fabricated on a single dielectric substrate. Experimental results are found in good agreement with the simulated ones in terms of radiation patterns, gain, AR, efficiency, and reflection coefficient. In particular, the 3-dB AR beamwidth at the central frequency of 1.6 GHz is extended to 135 • at XZ-plane and 142 • at Y Zplane. Moreover, the overall size of the constituted CP antenna with folded dipoles is decreased to 0.43 λ0 × 0.43 λ0 (λ0 is the wavelength in free space).Index Terms-Circularly polarized antenna, folded dipole and radiation pattern subtraction, wide beamwidth. Y. Luo and Q.-X. Chu are with the

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Section: Introductionmentioning

confidence: 99%

A Miniaturized Wide-Beamwidth Circularly Polarized Planar Antenna via Two Pairs of Folded Dipoles in a Square Contour

Luo

Chu

2015

IEEE Trans. Antennas Propagat.

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“…However, the antennas mentioned above have relatively large dimension, and the impedance and AR bandwidths are relatively narrow. On the other hand, many studies have been done to achieve wide ARBW such as loading a magneto-electric dipole in [6,7], introducing parasitic structures around the antenna in [8,9], adopting asymmetric microstrip antennas with integrated circular or stub patches in [10,11] and combining two pairs of linear dipoles in a square contour in [12]. Nevertheless, the HPBW of these antennas is narrower than 80 • .…”

Section: Introductionmentioning

confidence: 99%

A Wideband Circularly Polarized Antenna With Wide Beamwidth for GNSS Applications

Li¹,

Zhang²,

Zhang³

et al. 2018

PIER C

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A wideband circularly polarized antenna with wide half power beamwidth (HPBW) and 3 dB axial-ratio beamwidth (ARBW) is proposed in this paper. The circularly polarized (CP) radiation is realized by feeding two crossed printed dipoles through a wideband feeding network with broadband 90 • phase shift. By adding a thick substrate layer and a notched-corner metal cavity around the antenna, the impedance bandwidth (VSWR < 2) is greatly enhanced. The HPBW of the proposed antenna is greater than 110 • while the ARBW is greater than 130 • in the operating band, simultaneously. The overall dimension of the antenna is only 70 × 70 × 36 mm 3. The measured results show that the impedance bandwidth of the proposed antenna reaches 54.7% (1.06 GHz-1.86 GHz) while the AR bandwidth (AR < 3 dB) is 48.6% (1.08 GHz-1.78 GHz). As such, the proposed antenna can be widely used in various global navigation satellite system (GNSS) applications.

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“…Some techniques have been reported to widen the 3 dB AR beamwidth of basic CP antennas. Among them, parasitic square rings [15–18], circle rings [19, 20] or metal cylinders [21] are employed above or around a CP radiator to increase the AR beamwidth. Unfortunately, such approaches not only increase the overall size but also the complexity of CP antennas.…”

Section: Introductionmentioning

confidence: 99%

Enhancing cross‐polarisation discrimination or axial ratio beamwidth of diagonally dual or circularly polarised base station antennas by using vertical parasitic elements

Luo¹,

Chu

Børnemann³

2017

IET Microwaves, Antennas & Propagation

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The cross-polarisation discrimination (XPD) of a ± 45° dual-polarised base station antenna is enhanced by adding vertical parasitic elements. First, it is established that high XPD can be achieved by employing four vertical parasitic elements between a simple ± 45° dual-polarised radiator and ground. Second, based on the proposed method, a simple ± 45° dualpolarised antenna for a long-term evolution 1.71-2.17 GHz base station is designed, fabricated and measured. Compared with the antenna without vertical elements, XPDs are improved by about 7 dB in the horizontal plane due to the addition of the vertical parasitic elements. Third, with a wideband quadrature hybrid, the proposed antenna is shown to radiate circularly polarised waves. In particular, the 3 dB axial ratio beamwidth of the proposed antenna is increased from 84° to 195° with the addition of the four vertical parasitic elements.

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A novel wide beamwidth and circularly polarized microstrip antenna loading annular dielectric superstrate with metal ring

Cited by 16 publications

References 4 publications

A Miniaturized Wide-Beamwidth Circularly Polarized Planar Antenna via Two Pairs of Folded Dipoles in a Square Contour

A Miniaturized Wide-Beamwidth Circularly Polarized Planar Antenna via Two Pairs of Folded Dipoles in a Square Contour

A Wideband Circularly Polarized Antenna With Wide Beamwidth for GNSS Applications

Enhancing cross‐polarisation discrimination or axial ratio beamwidth of diagonally dual or circularly polarised base station antennas by using vertical parasitic elements

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