NDLI: High performance circularly polarized microstrip antenna

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High performance circularly polarized microstrip antenna

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1997
Description	A microstrip antenna for radiating circularly polarized electromagnetic waves comprising a cluster array of at least four microstrip radiator elements, each of which is provided with dual orthogonal coplanar feeds in phase quadrature relation achieved by connection to an asymmetric T-junction power divider impedance notched at resonance. The dual fed circularly polarized reference element is positioned with its axis at a 45 deg angle with respect to the unit cell axis. The other three dual fed elements in the unit cell are positioned and fed with a coplanar feed structure with sequential rotation and phasing to enhance the axial ratio and impedance matching performance over a wide bandwidth. The centers of the radiator elements are disposed at the corners of a square with each side of a length d in the range of 0.7 to 0.9 times the free space wavelength of the antenna radiation and the radiator elements reside in a square unit cell area of sides equal to 2d and thereby permit the array to be used as a phased array antenna for electronic scanning and is realizable in a high temperature superconducting thin film material for high efficiency.
File Size	1552541
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980029702
Archival Resource Key	ark:/13960/t3033sc9k
Language	English
Publisher Date	1997-08-26
Access Restriction	Open
Subject Keyword	Communications And Radar Patents Superconductivity Scanners Planar Structures Electromagnetic Radiation Dividers High Temperature Rotation Thin Films Phased Arrays Microstrip Antennas Bandwidth Resonance Impedance Quadratures Antenna Arrays Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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