A spiral antenna backed by a conducting plane reflector

Nakano, Hisamatsu; Nogami, K.; Arai, Seiichi; Mimaki, H.; Yamauchi, Junji

doi:10.1109/tap.1986.1143893

Cited by 221 publications

(114 citation statements)

References 5 publications

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“…It is found that, as the aspect ratio decreases, the height needs to be increased. The dependence of AR performance on the antenna height above a ground plane has also been observed for other planar CP antennas, such as spiral antennas backed by a conducting plane reflector [19]. Our investigation reveals that a decrease in the antenna height changes the travelling-wave current distribution on driven loops, thus deteriorating the AR performance.…”

Section: Wideband Rectangular-loop Antennassupporting

confidence: 72%

Development of wideband circularly polarised square- and rectangular-loop antennas

Basat

Traille

et al. 2006

IEE Proc., Microw. Antennas Propag.

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New types of wideband circularly polarised (CP) square-and rectangular-loop antennas are developed and discussed. It is shown that the bandwidth for circular polarisation of a loop antenna can be significantly increased by adding a parasitic loop inside the original loop. The addition of the parasitic element can create one more minimum axial ratio (AR) point, which can appropriately combine with the original one, leading to a significant enhancement for the AR bandwidth. It is found that the AR ( r 2 dB) bandwidth of a square-loop antenna can be increased from 6.5% to 20% by adding a parasitic square loop. By replacing the square loop with a rectangular loop, the AR bandwidth can be further enhanced. For a rectangular loop with an aspect ratio of 1/2, a bandwidth of nearly 50% for AR r 2dB is obtained with a gain of 8.5-7.5 dBi. A broadband balun is introduced for impedance matching.

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Section: Wideband Rectangular-loop Antennassupporting

confidence: 72%

Development of wideband circularly polarised square- and rectangular-loop antennas

Basat

Traille

et al. 2006

IEE Proc., Microw. Antennas Propag.

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“…Thus, a bandwidth approximately from 2.8 GHz to 6.7 GHz is considered here in Figure 5. Figure 5 shows that the input reactance is close to zero in the radiation region, which is a well-known property of spiral antenna [7,10,16]. A clearly frequency-independent behavior of input impedance is observed on the self-complementary structure (χ = 0.5) over the bandwidth.…”

Section: Parametric Study Of Archimedean Spiral Antennamentioning

confidence: 74%

“…A number of numerical methods have been developed and utilized to model these broadband attributes. The method of moments (MoM) with thin-wire assumption is applied in several earlier works to investigate the spiral on an infinite reflector [7], impedance loading along the spiral arms [8], and monofilar spiral backed by a ground plane [9] in free space. The printed wire design can also be analysed by MoM on a semi-infinite dielectric substrate [10], an infinite conductor-backed substrate [11,12], and an infinite grounded substrate with superstrate [13].…”

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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“…The fact that (15) and (16) do not include any calculations of integrals reduces the computational burden.…”

Section: Far-zone Fieldsmentioning

confidence: 99%

An integral equation and its application to spiral antennas on semi-infinite dielectric materials

Nakano

Hirose

Ohshima

et al. 1998

IEEE Trans. Antennas Propagat.

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Abstract-This paper presents an integral equation that can handle wire antennas on a semi-infinite dielectric material. The integral equation is reduced to a set of linear equations by the method of moments. For efficiency, the impedance matrix element Zm;n is divided into two parts on the basis of weighted Green's function extractions. The far-zone radiation field, which is formulated using the stationary phase method, is also described. After the validity of the presented numerical techniques is checked using a bow-tie antenna, a spiral antenna is analyzed. The current distribution, radiation pattern, axial ratio, power gain, and input impedance are discussed. It is found that the radiation field inside a dielectric material is circularly polarized. As the relative permittivity of the dielectric material increases, the angle coverage over which the axial ratio is less than 3 dB becomes narrower.Index Terms-Millimeter-wave antennas, spiral antennas.

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A spiral antenna backed by a conducting plane reflector

Cited by 221 publications

References 5 publications

Development of wideband circularly polarised square- and rectangular-loop antennas

Development of wideband circularly polarised square- and rectangular-loop antennas

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

An integral equation and its application to spiral antennas on semi-infinite dielectric materials

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