Results 271 to 280 of about 21,050 (313)
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IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450), 2004
A novel cavity-backed slot antenna is proposed and experimentally studied. The antenna consists of a slot cut in a ground plane and backed by shorting strips, forming a backing cavity. Preliminary results based on a prototype show a 2:1 VSWR input impedance bandwidth of more than 20%, which can be further enhanced.
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A novel cavity-backed slot antenna is proposed and experimentally studied. The antenna consists of a slot cut in a ground plane and backed by shorting strips, forming a backing cavity. Preliminary results based on a prototype show a 2:1 VSWR input impedance bandwidth of more than 20%, which can be further enhanced.
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Electronics and Communications in Japan (Part I: Communications), 1983
AbstractOne of the self‐complementary antennas is axially symmetric and three‐dimensional. Since this antenna has an axially‐symmetrical antenna, made of a finite‐sized plate, it becomes a hard‐to‐control multibeam antenna. to obtain a single beam we remove one of the unipole arrays from a self‐complementary unipole‐slot array antenna made of two ...
Takayuki Ishizone +3 more
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AbstractOne of the self‐complementary antennas is axially symmetric and three‐dimensional. Since this antenna has an axially‐symmetrical antenna, made of a finite‐sized plate, it becomes a hard‐to‐control multibeam antenna. to obtain a single beam we remove one of the unipole arrays from a self‐complementary unipole‐slot array antenna made of two ...
Takayuki Ishizone +3 more
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Wideband columnar slot antenna
Microwave and Optical Technology Letters, 2016ABSTRACTA wideband columnar antenna featuring a radiating slot cut around the outside circumference of a rectangular waveguide is presented. The antenna operates effectively in the frequency band of 1.51–4.75 GHz. The antenna also exhibits a reasonably good omnidirectional pattern in the horizontal plane, with predominantly vertical polarization.
Lev Pazin, Yehuda Leviatan
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IEE Proceedings H Microwaves, Antennas and Propagation, 1991
Two types of dual-spiral slot antennas characterised by their simple feed are studied; one is a bidirectional radiation type (Bi-DSS) and the other is a unidirectional type (Uni-DSS). The radiation characteristics of the Bi-DSS are evaluated using the numerically determined magnetic current distribution.
K. Hirose, H. Nakano
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Two types of dual-spiral slot antennas characterised by their simple feed are studied; one is a bidirectional radiation type (Bi-DSS) and the other is a unidirectional type (Uni-DSS). The radiation characteristics of the Bi-DSS are evaluated using the numerically determined magnetic current distribution.
K. Hirose, H. Nakano
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2007 Loughborough Antennas and Propagation Conference, 2007
In this paper, we provide numerical and experimental verification of the size reduction and polar pattern modification that can be achieved by using a slot excited textured surface antenna as compared to a conventional slot antenna constructed from a flat perfectly conducting metal sheet, PEC.
S.W. Simms, V.F. Fusco
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In this paper, we provide numerical and experimental verification of the size reduction and polar pattern modification that can be achieved by using a slot excited textured surface antenna as compared to a conventional slot antenna constructed from a flat perfectly conducting metal sheet, PEC.
S.W. Simms, V.F. Fusco
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Annular slot monopulse antennas
IRE International Convention Record, 2005This paper describes the design and performance of annular slot planar arrays which generate pencil beams and monopulse tracking beams in both principal planes. These planar arrays consist of a transmission line in the form of a radial waveguide whose upper plate contains annular groups of linear slots.
K. Kelly, F. Goebels
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IETE Journal of Research, 1981
Planar antennas employing printed circuit techniques are ideally suited for aircraft, spacecraft and mobile-land applications. Keeping these in view, a 12×4-element planar array antenna has been developed. The antenna has a power gain of 19 dB. It has a half power beamwidth of 6° in the H-plane and 20° in the E-plane.
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Planar antennas employing printed circuit techniques are ideally suited for aircraft, spacecraft and mobile-land applications. Keeping these in view, a 12×4-element planar array antenna has been developed. The antenna has a power gain of 19 dB. It has a half power beamwidth of 6° in the H-plane and 20° in the E-plane.
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Electrical tuning of phase-change antennas and metasurfaces
Nature Nanotechnology, 2021Kye L Okabe +2 more
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