A Novel Reflective Surface for an UHF Spiral Antenna

Kramer, B.A.; Koulouridis, Stavros; Chen, Chi‐Chih; Volakis, J. L.

doi:10.1109/lawp.2005.863613

Cited by 44 publications

(22 citation statements)

References 2 publications

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“…Ferrites have many important applications in industry, modern telecommunication and electronic devices and they are still of interest as promising materials for miniature electro-optic modulators, pyroelectric detectors, piezoelectric sensors, high quality filters, transformer cores, ferrite isolators, memory core industry, multilayer chip inductor, rod antennas, radiofrequency circuits, wave guides and electronic memory elements as well as a recording media (Muralidharan et al, 2010;Wu et al, 2011;Kramer et al, 2006;Ahmed et al, 2007). The Mg-Cu-Zn ferrites have become important to industry because of their applications in intermediate frequency transformer and antenna cores.…”

Section: Introductionmentioning

confidence: 99%

THE ELECTRICAL PROPERTIES OF Mg-Cu-Zn FERRITES IRRADIATED BY Î³-RAYS OF <sup>60</sup>Co SOURCE

Eltabey

Hassan²,

Ali

2014

American Journal of Applied Sciences

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Ferrite samples with chemical formula Mg x Cu 0.5-x Zn 0.5 Fe 2 O 4 (x = 0.0, 0.2 and 0.4) was prepared by the conventional ceramic method. The enhanced changes in the dc/ac resistivity and the dielectric constant due to γ-rays irradiation by 60 Co source were measured using the two probes technique. The samples showed decreasing of their resistivity at room temperature after irradiation for both dc and ac applied electric fields. Temperature dependence curves of the dc resistivity, before and after irradiation, showed three regions with different activation energies. It was also observed that the activation energy decreased after irradiation at every region. The frequency dependence of ac resistivity and dielectric constant parameters were investigated before and after irradiation process. Both real part (ε') and imaginary part (ε'') of the dielectric constant were decreased due to irradiation. These results were discussed in the view of gamma rays interaction with ferrite lattice.

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Section: Introductionmentioning

confidence: 99%

THE ELECTRICAL PROPERTIES OF Mg-Cu-Zn FERRITES IRRADIATED BY Î³-RAYS OF <sup>60</sup>Co SOURCE

Eltabey

Hassan²,

Ali

2014

American Journal of Applied Sciences

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“…These specifications require an axial ratio lower than 3 dB on an extended angular range and a pattern amplitude roll-off of at least 10 dB from zenith to horizon [1]. At present, spiral antennas [2], linear arrays of dipoles, and patch antennas placed on choke rings [3], if properly designed, will match the requirements but they are not suited for aerospace applications as they are limited by space, weight and some other aspects.…”

Section: Introductionmentioning

confidence: 99%

Broadband Multipath-Rejection Shorted Annular Patch Antenna for GPS Applications

Ji¹,

Fu²,

Zhang³

et al. 2013

PIER Letters

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Abstract-A compact shorted annular patch antenna for global positioning system is presented in this paper. Multipath-rejection capability is realized with two stacked shorted annular patches (SAP). The broadband characteristic of the (−10 dB return loss) input impedance bandwidth and the 3 dB bandwidth of axial ratio is achieved by employing capacitively coupled feed structure while the shorted pins located between the upper and the lower patches will realize the impendence matching of the high frequency, which can cover L5/L2/L1 bands for GPS and the relative input impedance bandwidth can achieve 50.6%. The size is 0.3λ × 0.3λ for 1.1 GHz.

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“…To improve the UHF broadband spiral antenna gain, a reflective surface consisting of a ferrite and conductive coating was proposed in [9]. Inspired by [9], we put forward the hybrid backed-cavity with EBG structure and PEC in the paper.…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by [9], we put forward the hybrid backed-cavity with EBG structure and PEC in the paper. Based on AMC characteristic, the EBG structure is placed in the outer region of backed-cavity to improve the blind spot gain in low frequency.…”

Section: Introductionmentioning

confidence: 99%

The Numerical Simulation of the Broadband Spiral Antenna Design Based on Hybrid Backed-Cavity

Liu

et al. 2009

J Infrared Milli Terahz Waves

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In the paper, the hybrid backed-cavity with EBG (Electromagnetic Band-Gap) structure and PEC (Perfect Electronic Conductor) is proposed for Archimedean spiral antenna, which can make the spiral antenna work over the 10:1 bandwidth, without the loss introduced by absorbing materials. Based on the AMC characteristic (Artificial Magnetic Conductor), the EBG is placed in the outer region of backed-cavity to improve the blind spot gain in the low frequency. The PEC at the center of the structure is used to obtain high gain at high frequency. The better antenna performances are achieved in the low profile spiral antenna. A typical spiral antenna with hybrid backed cavity is numerically studied. The novel spiral antenna design with hybrid backed cavity is validated by simulated results.

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A Novel Reflective Surface for an UHF Spiral Antenna

Cited by 44 publications

References 2 publications

THE ELECTRICAL PROPERTIES OF Mg-Cu-Zn FERRITES IRRADIATED BY Î³-RAYS OF <sup>60</sup>Co SOURCE

THE ELECTRICAL PROPERTIES OF Mg-Cu-Zn FERRITES IRRADIATED BY Î³-RAYS OF <sup>60</sup>Co SOURCE

Broadband Multipath-Rejection Shorted Annular Patch Antenna for GPS Applications

The Numerical Simulation of the Broadband Spiral Antenna Design Based on Hybrid Backed-Cavity

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