Results 281 to 290 of about 750,689 (337)
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IEEE Antennas and Propagation Magazine, 2001
When compared to printed cavity-backed spirals, slot spiral antennas offer the possibility of designs that are conformal and very thin. We discuss the physical characteristics of a cavity-backed slot spiral, as well as the associated infinite balun and termination designs.
J.L. Volakis +2 more
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When compared to printed cavity-backed spirals, slot spiral antennas offer the possibility of designs that are conformal and very thin. We discuss the physical characteristics of a cavity-backed slot spiral, as well as the associated infinite balun and termination designs.
J.L. Volakis +2 more
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Curved spiral antennas for freshwater applications
2015 IEEE Radio and Wireless Symposium (RWS), 2015Using FEKO EMSS simulation software we performed a numerical investigation of prototype, curved spiral antennas for underwater applications. We simulated flat and curved spiral antennas mounted on a pocketbook mussel (lampsilis cardium) in river water. The simulation incorporated the antenna, the mussel shell, the mussel tissue and freshwater as medium.
R. A. Llamas +2 more
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IEEE Transactions on Antennas and Propagation, 2021
An ultrawideband circularly polarized (CP) planar array antenna built by new radiation elements, the bold-C spiral elements, in millimeter-wave band is presented in this article.
Tianling Zhang +4 more
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An ultrawideband circularly polarized (CP) planar array antenna built by new radiation elements, the bold-C spiral elements, in millimeter-wave band is presented in this article.
Tianling Zhang +4 more
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Archimedean Spiral Slotted Leaky-Wave Antenna
IEEE Transactions on Antennas and Propagation, 2022In this work, a novel leaky-wave antenna (LWA) with Archimedean spiral slots is proposed for realizing high radiation efficiency and stable gain performance in both frequency-controlled and fixed-frequency beam-scanning applications.
Xiaowen Li +6 more
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IEE Proceedings F Communications, Radar and Signal Processing, 1985
The reason for the popularity of the cavity-backed spiral antenna in ESM systems is discussed, together with the surprising lack of supporting analysis and detailed understanding of its operation. In the absence of any published mathematical analysis of the complete antenna, the function and principle of operation of the three main antenna components ...
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The reason for the popularity of the cavity-backed spiral antenna in ESM systems is discussed, together with the surprising lack of supporting analysis and detailed understanding of its operation. In the absence of any published mathematical analysis of the complete antenna, the function and principle of operation of the three main antenna components ...
openaire +1 more source
Natural and metamaterial spiral antennas
2012 IEEE International Workshop on Antenna Technology (iWAT), 2012A low-profile cavity-backed spiral antenna with an absorbing strip exhibits wideband radiation characteristics. An EBG reflector is useful in designing a small spiral for medium frequency bandwidth operation. A modified EBG reflector contributes to mitigation of the partial deterioration of the antenna characteristics in a low-profile equiangular ...
H. Nakano +3 more
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Performance enhancement of shorted polygonal archimedean spiral antenna using hybrid reflector
AEU - International Journal of Electronics and Communications, 2019In this paper, performance enhancement in a shorted polygonal archimedean spiral antenna has been proposed by backing it with a hybrid reflector. In the proposed work, two arms of the polygonal spiral antenna are shorted at an outer octagonal conductive ...
Udaiyakumar Ramamoorthy +5 more
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Ultrawideband, high-gain, high-efficiency, circularly polarized Archimedean spiral antenna
AEU - International Journal of Electronics and Communications, 2019This paper presents an ultrawideband (UWB) circularly polarized (CP) two-arm Archimedean spiral antenna with unidirectional radiation patterns. The antenna is directly fed by a 50-Ω coaxial cable and reflected by a circular cavity. The proposed design is
H. Tran, T. T. Le
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IEEE Antennas and Propagation Society Symposium, 2004., 2004
A spiral antenna is a radiation element that radiates a circularly polarized (CP) wave over a wide frequency bandwidth. The spiral is often backed by a conducting plane to change the inherently bidirectional beam to a unidirectional one. The radiation pattern has been qualitatively and quantitatively investigated (Nakano, H. 1987; Nakano et al., 1988).
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A spiral antenna is a radiation element that radiates a circularly polarized (CP) wave over a wide frequency bandwidth. The spiral is often backed by a conducting plane to change the inherently bidirectional beam to a unidirectional one. The radiation pattern has been qualitatively and quantitatively investigated (Nakano, H. 1987; Nakano et al., 1988).
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IEEE transactions on dielectrics and electrical insulation, 2019
Partial discharge inception voltage measurements under repetitive impulsive voltages play an essential role in evaluating the reliability of inverter-fed low voltage rotating machines.
Wanya Zhou +4 more
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Partial discharge inception voltage measurements under repetitive impulsive voltages play an essential role in evaluating the reliability of inverter-fed low voltage rotating machines.
Wanya Zhou +4 more
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