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Antennas and antenna arraysMicrostrip antennaSlot antennaSpiral antennaThe design and performance of a 4-arm slot spiral antenna operated in the 2nd (split-beam) mode is presented. The antenna combines Archimedean and equiangular spiral geometries to allow fabrication of a dual-Dyson balun feed with...
microwave antennasbroadband antennasantenna feedsangular momentumantenna radiation patternsfeeding portcorresponding spiral armOAM antenna5.8GHznear‐field phase distributionsAn orbital angular momentum (OAM) antenna based on four-arm planar spiral for multiple OAM modes generation is proposed in this Letter. ...
2^-MODE FOUR-ARM SLOT SPIRAL ANTENNAS Three feeding methods are proposed including a dual infinite or Dyson balun, a dual microstrip feed, and a vertical coaxial probe feed. The Dyson balunN... N Stutzke,N Kefauver,D Filipovic 被引量: 0发表: 2004年 Four-Arm 2nd Mode Equiangular Slot S...
Chou, H.-T., W.-J. Liao, and Y.-C. Hou, "Hybrid applications of RF lines and absorbing material to optimize the radiation patterns of four-arm spiral antennas in the direction finding system," J. of Electromagn. Waves and Applications, Vol. 21, No. 1, 81-96, 2007....
We report the discovery of a Keplerian accretion disk with a spatially resolved four-arm spiral pattern around G358.93-0.03-MM1. This result positively implicates disk accretion and spiral arm instabilities into the episodic accretion high-mass star formation paradigm. This is a preview of ...
Antennas and Propagation, IEEE Transactions onElmansouri, M.A.; Radway, M.J.; Filipovic, D.S., "Frequency- and time- domain performance of four-arm mode-2 spiral antennas," IEEE Trans. Antennas Propag., vol. 60, no. 6, pp. 2627-2634, 2012....
Multi-mode four-arm Archimedean spiral antennas, backed by partially-filled absorber, are investigated. A low-profile structure with an embedded balun is realized to produce balanced spiral modes for both broadside and conical radiation patterns over GPS frequency bands. Prototype antennas are developed...
Investigation of four-arm Archimedean spiral antennas with a built-in balun for balanced multi-mode operations in GPS applicationscircular polarizationlow-profile antennahigher order modesGPS systemsMulti-mode four-arm Archimedean spiral antennas, backed by partially-filled absorber, are investigated. A ...
Filipovic" Simply- Fed Four-Arm Spiral-Helix Antenna" IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 62, NO. 9, SEPTEMBER 2014M. A. Elmansouri, J. B. Bargeron and D. S. Filipovic, "Simply-fed four-arm spiral-helix antenna," IEEE Trans. Antennas Propag., vol. 62, no. 9, ...