Circular polarization antenna
AssigneeRadio Research Laboratories, Ministry of Posts and Telecommunications
InventorTasuku Teshirogi
Life of this patent
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Abstract
A circular polarization antenna having wide-band circular polarization characteristics and impedance characteristics is accomplished by feedng N-antenna elements which are shifted at an interval of .pi./N rad. with respect to the boresight direction with differential phase shift of an interval of .pi./N rad. corresponding to the angular orientation of the antenna elements so as to obtain perfect circular polarization with respect to the boresight direction. This antenna construction can be applied to circular polarization antennas of various types, thereby allowing a wide-band circular polarization array antenna or an array antenna for dual orthogonal circular polarizations having high polarization discrimination to be achieved.
Claims5
A circular polarization antenna comprising:
- a plurality of antenna elements having identical polarization characteristics and each having at least one feed point, said antenna elements being N (N.gtoreq.3) in number and spacially positioned on a plane at an orientation angle according to p .pi./N rad. (where p is an integral number of 1.ltoreq.p.ltoreq.N-1 with respect to the boresight direction, and
- a feed section connected to said antenna elements in respective differential phase shifts corresponding to said angular orientation of said antenna elements.
Dependencies are inferred from the claim text.