Analysis of circular patch antenna tuned by a ferrite post

Mavridis, A. A.; Kyriacou, George A.; Sahalos, John N.

doi:10.1002/mop.20954

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…The subject was extensively investigated in our previous work [2] where a ratio of α/b ≈ 0.3 was found to be a good compromise between ferrite material reduction and electronic tuning.…”

Section: Results Of a Circular Patch Antenna Tuned By A Ferrite Postmentioning

confidence: 99%

“…Moreover, for a single post the central location is preferable as it preserves a strong interaction with the magnetic field. The detailed analysis was performed in our previous work [2]. Herein we only include the characteristic equation in order for this to be re-examined in view of the novel resonance in the negative µ ef f range.…”

Section: Circular Patch Antenna Tuned By Ferrite Postmentioning

confidence: 99%

“…A circular patch antenna tuned by a ferrite post was studied in our previous work [2]. A very strange phenomenon concerning the antenna tuneability was observed when the ferrite losses were ignored.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Design of Patch Antennas Tuned by Transversely Magnetized Lossy Ferrite Including a Novel Resonating Mode

Mavridis¹,

Kyriacou²,

Sahalos³

2006

PIER

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Abstract-Circularly symmetric patch antennas tuned by transversely magnetized lossy ferrite are studied. The circular and ring patch geometries printed on ferrite substrate or tuned by ferrite post and ferrite toroid are studied. Both saturated and partially magnetized ferrite are considered. Strong effects on the dispersive properties of modes propagating under the patch and in turn on the antenna resonant frequency and input impedance are observed when the ferrite losses are taken into account. The patch antennas resonance at a novel mode propagating in the traditionally assumed switch-off frequency range of negative effective permeability constitutes an essential original contribution of this work. In all cases the dynamic control of the patch resonant frequency through the DC-biasing field is investigated. The "perfect magnetic walls approximation" was employed in the analysis since it offers a valuable physical insight as well as simplified closed form expressions for the resonant conditions. These are used as engineering design formulas for an initial antenna design, which is in turn fine tuned with the aid of a numerical simulation-optimization scheme. The validity of the present method was verified through comparisons with published experimental results and numerical simulations.

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“…The subject was extensively investigated in our previous work [2] where a ratio of α/b ≈ 0.3 was found to be a good compromise between ferrite material reduction and electronic tuning.…”

Section: Results Of a Circular Patch Antenna Tuned By A Ferrite Postmentioning

confidence: 99%

Section: Circular Patch Antenna Tuned By Ferrite Postmentioning

confidence: 99%

See 1 more Smart Citation

On the Design of Patch Antennas Tuned by Transversely Magnetized Lossy Ferrite Including a Novel Resonating Mode

Mavridis¹,

Kyriacou²,

Sahalos³

2006

PIER

View full text Add to dashboard Cite

show abstract

“…In other research, microstrip patch antennas on a normally magnetized ferrite substrate were found to radiate a CP pattern [18][19][20]; however, the corresponding AR bandwidths and beamwidths were quite narrow as the clockwise and counter clockwise resonant modes were close in frequency and the coupling between these two opposite modes degraded the AR figures. To overcome these problems, Ghalibafan et al presented a wide-angle circularly polarized antenna [21] designed to operate in the frequency range where ferrite has a negative effective permeability.…”

Section: Introductionmentioning

confidence: 93%

Ferrite‐based wideband circularly polarized microstrip antenna design

Mashhadi

Komjani

Rejaei³

et al. 2019

ETRI Journal

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In this paper, a wideband, circularly polarized patch antenna is proposed that leverages the unidirectional resonant modes of a circular patch mounted on top of a grounded dielectric‐ferrite substrate. The proposed antenna is fed via the proximity coupling method and several parasitically coupled patches are placed on a dielectric superstrate to enhance the impedance bandwidth of the antenna. The resonant modes of the structure rotate only in the clockwise or counter clockwise directions. In the frequency range where the effective permeability of the ferrite layer is negative, the resonance frequencies of these modes differ significantly, which produces a large axial ratio (AR) bandwidth. For the proposed antenna, the numerical results show the 10 dB impedance bandwidth to be around 44% and the 3 dB axial ratio bandwidth to be higher than 64%.

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“…Microstrip patch CPA (MP-CPA) can be designed as a single feed [2][3][4][5][6][7][8][9] and dual (multiple) feed types. [10][11][12][13] Ferrite-based CPA's [14][15][16][17][18][19] provide a number of attractive features like beam scanning, 20,21 low radar crosssection scattering, 22,23 frequency tunability 24 and possible surface-wave reduction. 25 These properties can be achieved by the dynamic control of ferrite permeability tensor using a dc, bias magnetic field.…”

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

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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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Analysis of circular patch antenna tuned by a ferrite post

Cited by 9 publications

References 2 publications

On the Design of Patch Antennas Tuned by Transversely Magnetized Lossy Ferrite Including a Novel Resonating Mode

On the Design of Patch Antennas Tuned by Transversely Magnetized Lossy Ferrite Including a Novel Resonating Mode

Ferrite‐based wideband circularly polarized microstrip antenna design

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

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