Results 31 to 40 of about 27,684 (298)
Circularly polarized dielectric resonator antenna excited by a conformal wire [PDF]
, 2008 A conformal spiral wire has been used to feed a dielectric resonator antenna to obtain a circular polarization. The parameters of the spiral have been optimized numerically so that minimum axial ratio (AR) and return losses are achieved.
Khamas, S.K.
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International Journal of Antennas and Propagation, 2018 This paper presents, for the first time, the hybrid use of loading techniques (which involve terminating the spiral arms with different structures to give a resistive or capacitive effect) and a novel technique of cavity groove in order to enhance the ...
Muhammad Hamza, Wasif T. Khan
doaj +1 more source
A Novel Four-Arm Planar Spiral Antenna for GNSS Application
IEEE Access, 2021 This letter introduces a novel four-arm planar spiral antenna which provides a perfect circular polarization radiation for Global Navigation Satellite System applications. The antenna mainly consists of four parts: an Archimedes spiral radiation area, an
Lili Guo +4 more
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Millimeter-Wave Lumped Element Superconducting Bandpass Filters for Multi-Color Imaging [PDF]
, 2009 The opacity due to water vapor in the Earth's atmosphere obscures portions of the sub-THz spectrum (mm/sub-mm wavelengths) to ground based astronomical observation.
Day, Peter K. +5 more
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A Novel Square-Spiral Strip Antenna [PDF]
2007 2nd International ITG Conference on Antennas, 2007 A square-spiral strip antenna is designed considering the procedure used to obtain log-periodic antennas. Simulation results of the new design are compared with those of the well known and widely used Archimedean spiral antenna in terms of the frequency dependency. The effect of dielectric substrate used to support the antennas is also investigated.
Saynak, Uğur, Kuştepeli, Alp
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IEEE Access, 2023 In this study, a new spiral dual-band antenna integrated with an optical system for a small CubeSat spacecraft was proposed. It is challenging to design an antenna with a limited space on a CubeSat platform.
Nursultan Meirambekuly +6 more
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Novel Square Spiral Antennas for Broadband Applications [PDF]
Frequenz, 2009 An investigation of novel square spiral antennas is presented. The antennas are designed by considering the special arrangements of spiral arms. The new designs perform much better in terms of the frequency independency of the fundamental antenna parameters, when compared with the well known and widely used Archimedean spiral antenna, which makes the ...
Saynak, Ugur, Kustepeli, Alp
openaire +3 more sources
How to Detect the Signatures of Self-Gravitating Circumstellar Discs with the Atacama Large Millimetre/sub-millimetre Array [PDF]
, 2014 In this paper we present simulated Atacama Large Millimetre/sub-millimetre Array (ALMA) observations of self-gravitating circumstellar discs with different properties in size, mass and inclination, located in four of the most extensively studied and ...
Dipierro, Giovanni +3 more
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FEBS Letters, EarlyView.Cryptochrome and PAS/LOV proteins play intricate roles in circadian clocks where they act as both sensors and mediators of protein–protein interactions. Their ubiquitous presence in signaling networks has positioned them as targets for small‐molecule therapeutics. This review provides a structural introduction to these protein families.
Eric D. Brinckman +2 more
wiley +1 more source
Spiral slotted phased antenna array [PDF]
, 1982 A flush mounting, cavity-backed, dual orthogonal slot antenna for aircraft and space vehicles is described. Improved radiation pattern characteristics are obtained by making the spiral slot pattern elliptical in the aperture plane. A cavity and a flanged
Ellis, H., Jr.
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