A Circularly Polarized Antenna Based on the Unidirectional Resonant Modes of a Ferrite Disk

Ghalibafan, Javad; Rejaei, B.; Komjani, Nader

doi:10.1109/tmag.2013.2283655

Cited by 19 publications

(35 citation statements)

References 16 publications

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“…In Reference we proposed a circularly polarized antenna that consists of a normally magnetized ferrite disk mounted on a ground plane and metalized on top. The antenna works in the frequency range where the effective permeability of the ferrite is negative.…”

Section: Introductionmentioning

confidence: 99%

“…The antenna works in the frequency range where the effective permeability of the ferrite is negative. To simplify the analysis, we neglected the variation of the electromagnetic fields along the dc bias field and magnetization (z‐axis) in Reference . While this approximation is valid for thin disks, higher order modes with fields varying normal to the ferrite disk can be excited as the disk thickness increases.…”

Section: Introductionmentioning

confidence: 99%

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Analytical calculation for input impedance of a circularly‐polarized ferrite disk antenna including higher order modes

Ahmadvand

Heydari

Rejaei

et al. 2019

Int J RF Microw Comput Aided Eng

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We propose an accurate analytical model for a circularly polarized antenna comprising a normally magnetized, grounded ferrite disk with a metalized top surface. The antenna is assumed to be excited by a conventional current probe. In the case of a thin ferrite disk, the electromagnetic fields of the dominant mode of the antenna do not vary in the direction normal to the disk. However, with increasing thickness of the ferrite disk, higher order modes start to affect antenna characteristics such as resonance frequency. This work presents an analysis of the structure that takes into account all higher modes of the antenna. To validate the theoretical calculations, HFSS simulations are performed. The antenna can be tuned by changing the magnetic bias field.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical calculation for input impedance of a circularly‐polarized ferrite disk antenna including higher order modes

Ahmadvand

Heydari

Rejaei

et al. 2019

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

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“…In Refs. and , ferrite layers are embedded in the substrate of patch or helical antennas, respectively, and both of them achieve 10% of tunable frequency range. Because of the features of light weight, low profile, high Q factor, and easiness to integrate with other circuits, substrate integrated waveguide (SIW) has been used in RA designs, for example, SIW‐RA using varactors has a tunable frequency range from 4.13 to 4.50 GHz .…”

Section: Introductionmentioning

confidence: 99%

Realizing frequency reconfigurable antenna by ferrite-loaded half-mode SIW

Lou

Meng

et al. 2017

Microw. Opt. Technol. Lett.

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We propose and experimentally demonstrate a frequency reconfigurable antenna using ferrite loaded half‐mode substrate integrated waveguide (SIW). The antenna design is based on a SIW cavity with an embedded ferrite slab, which causes the resonant frequency of the cavity tunable under bias magnetic field. The antenna features omni‐direction radiation and small size. A prototype antenna is designed and fabricated. The measurements show the tunable frequency bandwidth is over 11% covering frequencies 5.04–5.62 GHz in low bias magnetic field region, and 5% covering 4.28–4.5 GHz in high bias magnetic field region. The measurement is in good agreement with simulations. The gain of antenna is all over 1.6 dBi, and the frequency reconfiguration does not affect the radiation pattern of the antenna, providing a preferable feature for frequency reconfigurable antenna. This type of antenna may be a good candidate for practical applications such as base stations and satellites. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1365–1371, 2017

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“…However, this technique may launch undesired surface waves in the substrate, resulting in degrading its AR bandwidth. In [17], the 90 • 3-dB AR beamwidth was achieved by mounting a ferrite disk on a ground plane. In this context, a CP antenna with 85 • 3-dB AR beamwidth was reported and it is formed by integrating two trapezoidal-shaped dipoles with two bowtie patch antennas [18].…”

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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A Circularly Polarized Antenna Based on the Unidirectional Resonant Modes of a Ferrite Disk

Cited by 19 publications

References 16 publications

Analytical calculation for input impedance of a circularly‐polarized ferrite disk antenna including higher order modes

Analytical calculation for input impedance of a circularly‐polarized ferrite disk antenna including higher order modes

Realizing frequency reconfigurable antenna by ferrite-loaded half-mode SIW

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

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