Loop antenna for radiating circularly polarized waves
First Claim
Patent Images
1. A loop antenna for radiating a circularly polarized wave comprising:
- a ground plane;
a C-type loop element having a cutoff part; and
an I-shape conductor having one end connected to the C-type loop element and another end served as a feeding point, said I-shape conductor extending in a radial direction of the C-type loop element, said C-type loop element being located in a plane that is parallel to said ground plane with a predetermined space being provided between said ground plane and the parallel plane in which said C-type loop antenna is located, the I-shaped conductor being at an angle to the cutoff part on the C-type loop element which angle is about ±
35°
˜
±
45°
°
or about ±
135°
˜
±
145°
.
1 Assignment
0 Petitions
Accused Products
Abstract
A loop antenna for a circularly polarized wave can operate in a wide frequency range and can be simply constructed. A radiating power fed to a feeding point via a coaxial line and a feeder conductor is transmitted through an I-shape conductor to a C-type loop element disposed in spaced facing relation to a ground plane. By the action of a cutoff part formed on the C-type loop element, the C-type loop element radiates a circularly polarized wave. An angle of between 35° and 45° formed by the I-shape conductor and the cutoff part.
27 Citations
8 Claims
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1. A loop antenna for radiating a circularly polarized wave comprising:
-
a ground plane; a C-type loop element having a cutoff part; and an I-shape conductor having one end connected to the C-type loop element and another end served as a feeding point, said I-shape conductor extending in a radial direction of the C-type loop element, said C-type loop element being located in a plane that is parallel to said ground plane with a predetermined space being provided between said ground plane and the parallel plane in which said C-type loop antenna is located, the I-shaped conductor being at an angle to the cutoff part on the C-type loop element which angle is about ±
35°
˜
±
45°
°
or about ±
135°
˜
±
145°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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Current AssigneeNippon Antenna Kabushiki Kaishya
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Original AssigneeNippon Antenna Kabushiki Kaishya
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InventorsNakano, Hisamatsu
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Primary Examiner(s)LE, HOANGANH T
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Application NumberUS08/704,696Time in Patent Office791 DaysField of Search343/741, 343/742, 343/866, 343/867US Class Current343/741CPC Class CodesH01Q 11/12 Resonant antennasH01Q 11/14 with parts bent, folded, sh...H01Q 7/00 Loop antennas with a substa...
