Effects on the radiation characteristics of using a corrugated reflector with a helical antenna and an electromagnetic band-gap reflector with a spiral antenna

Nakano, Hisamatsu; Hitosugi, K.; Tatsuzawa, N.; Togashi, D.; Mimaki, H.; Yamauchi, Junji

doi:10.1109/tap.2004.840755

Cited by 55 publications

(23 citation statements)

References 14 publications

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“…Therefore, we would expect that, at frequencies near the frequency that satisfies , the antenna characteristics do not deteriorate when the antenna height is reduced. So far, this expectation has been confirmed for thin wire antennas backed by an EBG reflector, such as dipole, curl, and small Archimedean spiral antennas [14], [15].…”

Section: B Equiangular Spiral With An Ebg Reflectormentioning

confidence: 67%

Low-Profile Equiangular Spiral Antenna Backed by an EBG Reflector

Nakano

Kikkawa

Kondo

et al. 2009

IEEE Trans. Antennas Propagat.

100

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Abstract-The bi-directional beam from an equiangular spiral antenna (EAS) is changed to a unidirectional beam using an electromagnetic band gap (EBG) reflector. The antenna height, measured from the upper surface of the EBG reflector to the spiral arms, is chosen to be extremely small to realize a low-profile antenna: 0.07 wavelength at the lowest analysis frequency of 3 GHz. The analysis shows that the EAS backed by the EBG reflector does not reproduce the inherent wideband axial ratio characteristic observed when the EAS is isolated in free space. The deterioration in the axial ratio is examined by decomposing the total radiation field into two field components: one component from the equiangular spiral and the other from the EBG reflector. The examination reveals that the amplitudes and phases of these two field components do not satisfy the constructive relationship necessary for circularly polarized radiation. Based on this finding, next, the EBG reflector is modified by gradually removing the patch elements from the center region of the reflector, thereby satisfying the required constructive relationship between the two field components. This equiangular spiral with a modified EBG reflector shows wideband characteristics with respect to the axial ratio, input impedance and gain within the design frequency band (4-9 GHz). Note that, for comparison, the antenna characteristics for an EAS isolated in free space and an EAS backed by a perfect electric conductor are also presented.Index Terms-Electromagnetic band gap (EBG) reflector, equiangular spiral, extremely low-profile structure, wideband operation.

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Section: B Equiangular Spiral With An Ebg Reflectormentioning

confidence: 67%

Low-Profile Equiangular Spiral Antenna Backed by an EBG Reflector

Nakano

Kikkawa

Kondo

et al. 2009

IEEE Trans. Antennas Propagat.

100

View full text Add to dashboard Cite

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“…A monopole curl antenna [1] and a square spiral antenna above a mushroom-like EBG surface [3] have been studied for circular polarization. A single loop wire antenna with rhombic configuration has been first proposed in [4].…”

Section: Introductionmentioning

confidence: 99%

Wideband low-profile circular polarized rectangular loop antenna over a mushroom-like EBG structure

Moghadasi

Attari

Mirsalehi

2008

IEICE Electron. Express

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Abstract:In this paper, a wideband dual rectangular loop antenna over an EBG surface is proposed for low profile wireless applications. A low frequency mushroom-like EBG surface is used as the antenna ground plane. In comparison with a PEC ground plane, design of antenna above an EBG ground plane results in 60% reduction of the structure thickness. The investigated antenna is designed for circular polarization. It is shown that the axial ratio bandwidth (< 3 dB) and return loss bandwidth (< 10 dB) of the dual rectangular loop antenna above the designed EBG surface are 18% and 14%, respectively. The simulated and measured results are in good agreement.

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“…The EBG reflector has been used as the ground plane of the wire antenna to achieve the low profile design [6], [7]. However, for the slot antenna with the tilted beam, such as the switched-beam slot antenna, it is not clear whether the utilization of the EBG reflector yields the low profile antenna.…”

Section: Introductionmentioning

confidence: 99%