Radiation field of spiral antennas employing multimode slow wave techniques

Cubley, H. D.; Hayre, H. S.

doi:10.1109/tap.1971.1139884

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…The' motivation of this research arises from a desire to reveal theoretically the radiation characteristics of a spiral antenna with a conducting plane reflector. The antenna characteristics which are evaluated from the numerically obtained current distributions, not the assumed current distributions [1]- [3], are presented with some experimental data. In order to operate the spiral antenna as a quasiself-complementary antenna [7], we choose the geometrical parameters in such a way that the ratio of the equivalent strip width 4 p (p:wire radius) to the spacing width between the neighboring wires is unity.…”

Section: Introductionmentioning

confidence: 99%

A spiral antenna backed by a conducting plane reflector

Nakano

Nogami

Arai

et al. 1986

IEEE Trans. Antennas Propagat.

221

107

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An Archiedean planar spiral antenna is numerically analyzed in the presence of a conducting plane reflector. The analysis shows that the spiral antenna backed by the plane reflector has two distinct regions in the current distribution, which explain the radiation of a circularly polarized wave for the outer circumference C ranging over shout 1.3 X < C < 1.5 A and C > 2.9 X, where A is a free-space wavelength. Further consideration is given to a truncated spiral antenna whose outer circumference is on the order of 1.4 A. The truncated spiral antenna maintains a decaying current distribution and radiates a circularly polarized wave over a k1.2 frequency bandwidth. It is also demonstrated that a power gain on the order of 8.5 dB is realized over the same frequency range.

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Section: Introductionmentioning

confidence: 99%

A spiral antenna backed by a conducting plane reflector

Nakano

Nogami

Arai

et al. 1986

IEEE Trans. Antennas Propagat.

221

107

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“…Spiral antenna is a slow-wave antenna [15], [16]. Individually, inner radius, outer radius, and the total number of turns all impact the phase velocity of the signal traveling down the antenna.…”

Section: B Main Spiral Arm Design Parameter Variationmentioning

confidence: 99%

Characterization, Analysis, and Implementation of Integrated Bandstop Structures on Ultra-Wideband Archimedean Spiral Antenna

Jeon

Chang

Pham

2016

IEEE Trans. Antennas Propagat.

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Abstract-A subsection of the radiating spiral arm, placed in parallel, induces a bandstop response at a notch frequency proportional to the resonant length of the strip. Detailed parametric study on the effect of variation of design parameters for an Archimedean spiral antenna and the resonant parallel strip (RPS) is presented. Empirical analysis on phase velocity on the radiating spiral arms allows characterization of RPS in terms of its resonant length. Identified systematic relation between design parameters and filter response is applied to design an antenna for the 3.1 -10.5 GHz operating band with the notch response over the IEEE 802.11a band, 5.15 to 5.95 GHz. Successful implementation is demonstrated through performance comparison between simulated and experimental results.

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“…[4][5][6] In past studies, we fabricated an antennacoupled VO x microbolometer detection device using a spiral antenna 7,8 with broadband characteristics and circular polarization characteristics for the antenna, and vandium oxide (VO x ) 9,10 that has a high temperature coefficient of resistance (TCR) and that is fabricated by metal organic deposition (MOD) [11][12][13] for the bolometer. In this method, we proposed using an antenna-coupled device that receives incident electromagnetic waves by an antenna without using a heat absorbing material, and inputs the received power directly into the bolometer.…”

Section: Introductionmentioning

confidence: 99%

“…In this method, we proposed using an antenna-coupled device that receives incident electromagnetic waves by an antenna without using a heat absorbing material, and inputs the received power directly into the bolometer. [4][5][6] In past studies, we fabricated an antennacoupled VO x microbolometer detection device using a spiral antenna 7,8 with broadband characteristics and circular polarization characteristics for the antenna, and vandium oxide (VO x ) 9,10 that has a high temperature coefficient of resistance (TCR) and that is fabricated by metal organic deposition (MOD) [11][12][13] for the bolometer. 14 However, in order to realize even higher sensitivity, it is necessary to improve the structure of the detection device itself in addition to experimenting with the bolometer material.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Characteristics in VOx Microbolometer Fabricated by MOD on Si3N4/SiO2 Membrane

et al. 2018

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VO x thin films were fabricated on Si 3 N 4 /SiO 2 /Si substrates by firing precursor films, which were fabricated by metal-organic decomposition (MOD), with a reduced pressure. Resistance-temperature (R-T) characteristics of the films indicating the phase transition from metal to insulator with about 4 orders of resistance change specified with VO 2 (M) were obtained. Furthermore, the films fabricated with a firing temperature of 580-600 • C had temperature coefficient of resistance (TCR) of −2.8 to −2.9 %/K at room temperature. After fabricating VO x microbolometers with 40 × 10 m 2 using the films on Si 3 N 4 /SiO 2 /Si substrates, Si with a thickness of about 340 m was etched using Deep-RIE and XeF 2 vapor etching from the backside of the substrate.Then, the VO x microbolometer was completed on Si 3 N 4 /SiO 2 membrane. The VO x microbolometer on Si 3 N 4 /SiO 2 membrane had a high DC sensitivity of 2310 W −1 , which was about 15 times higher than that of the microbolometer on the Si 3 N 4 /SiO 2 /Si substrate. K E Y W O R D SDeep-RIE, membranes, metal-organic decomposition (MOD), microbolometers, vanadium oxide (VOx) 12

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Radiation field of spiral antennas employing multimode slow wave techniques

Cited by 7 publications

References 2 publications

A spiral antenna backed by a conducting plane reflector

A spiral antenna backed by a conducting plane reflector

Characterization, Analysis, and Implementation of Integrated Bandstop Structures on Ultra-Wideband Archimedean Spiral Antenna

Evaluation of Characteristics in VO<sub>x</sub> Microbolometer Fabricated by MOD on Si<sub>3</sub>N<sub>4</sub>/SiO<sub>2</sub> Membrane

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