A Spiral Antenna Sandwiched by Dielectric Layers

Nakano, Hisamatsu; Ikeda, Masakazu; Hitosugi, K.; Yamauchi, Junji

doi:10.1109/tap.2004.829404

Cited by 35 publications

(18 citation statements)

References 9 publications

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“…satellite communication for GPS applications but when a parallel plate shaped DGS is implemented in the opposite side of patch in ground plane, a significant improvement is achieved. Bandwidth and return loss was highly improved [9][10][11]. Bandwidth has been modified up to 100% and so was the return loss which has been modified above 300 %.…”

Section: Resultsmentioning

confidence: 99%

Microstrip Antenna using DGS for Satellite Communication

Garg¹,

Ghosh²,

Chakrabarti³

2017

IJCA

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In this paper, authors proposed a new design of DGS to improve the characteristics of microstrip antenna for the use of satellite communication using L band frequencies for communication. This proposed antenna is designed at 1.78GHz (L Band). To achieve a very important bandwidth and efficiency enhancement author proposed symmetrical parallel plates shaped DGS in the ground plane. This symmetrical DGS on the other side of the patch increases the fringing field which consequently increased the parasitic capacitance. This coupling of patch and ground made the bandwidth and directivity enhanced from the RMPA without DGS. General Terms

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Section: Resultsmentioning

confidence: 99%

Microstrip Antenna using DGS for Satellite Communication

Garg¹,

Ghosh²,

Chakrabarti³

2017

IJCA

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“…The analysis space is truncated with Liao's secondorder absorbing boundary condition [13]. Based on the electric and magnetic fields obtained using the FDTDM, we calculate the antenna characteristics, including the radiation pattern, axial ratio, input impedance, and gain [14]. Fig.…”

Section: A Helical Antenna Above a Flat Pec Reflector (Determinationmentioning

confidence: 99%

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

Hitosugi

Tatsuzawa

et al. 2005

IEEE Trans. Antennas Propagat.

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Abstract-An axial-mode helical antenna backed by a perfect electric conductor (PEC reflector) is optimized to radiate a circularly polarized (CP) wave, using the finite-difference time-domain method (FDTDM). After the optimization, the PEC reflector is replaced with a corrugated reflector. The effects of the corrugated reflector on the current distribution along the helical arm and the radiation pattern are investigated. A reduction in the backward radiation is attributed to the reduction in the current flowing over the rear surface of the corrugated reflector. A spiral antenna backed by a PEC reflector of finite extent is also analyzed using the FDTDM. As the antenna height decreases, the reverse current toward the feed point increases, resulting in deterioration of the axial ratio. To overcome this deterioration, the PEC reflector is replaced with an electromagnetic band-gap (EBG) reflector composed of mushroom-like elements. Analysis reveals that the spiral radiates a CP wave even when the spiral is located close to the reflector (0.06 wavelength above the EBG surface). The input impedance for the EBG reflector is more stable over a wide frequency band than that for the PEC reflector.Index Terms-Corrugated reflector, electromagnetic band-gap reflector, finite-difference time-domain method (FDTDM), helical antenna, spiral antenna.

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“…For the printed spiral with non-negligible arm width, the thin-wire assumption is less valid due to the fact that the currents will reside on the edges of metal strip. The analysis of them has been performed using various computational techniques, e.g., the finite-volume time-domain (FVTD) method [14], the finite-difference time-domain (FDTD) method [15][16][17][18][19][20], the finite element method (FEM) [21], and commercial full-wave solvers [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Travelling Wave Mechanism and Novel Analysis of the Planar Archimedean Spiral Antenna in Free Space

Chen¹,

Huff²

2014

PIER

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Abstract-While Archimedean spiral antennas were invented a half-century ago, only selfcomplementary impedance can be evaluated directly from the Babinet's principle. This paper examines the effects of metal width and arm spacing on printed spiral's input impedance. A model is proposed based on examination by decomposition of planar spiral. A closed-form expression for the input impedance of Archimedean spiral antenna is obtained by evaluating the proposed model with conformal mapping techniques. Full-wave numerical simulations, Babinet's principle, and a fabricated antenna demonstrate the accuracy of the proposed model. The expression in this work can be used to find the impedance of a variety of spiral complementary structures analytically. The examination and discussion on the effects of other parameters and features in addition to the spiral itself are also provided through numerical simulation.

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A Spiral Antenna Sandwiched by Dielectric Layers

Cited by 35 publications

References 9 publications

Microstrip Antenna using DGS for Satellite Communication

Microstrip Antenna using DGS for Satellite Communication

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

Travelling Wave Mechanism and Novel Analysis of the Planar Archimedean Spiral Antenna in Free Space

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