Circularly polarized broadband microstrip antenna
First Claim
Patent Images
1. A circularly polarized microstrip antenna, comprising:
- a ground plane having a flat plate of conducting material;
a parasitic element disposed parallel to said ground plane, having a flat, generally circular conducting disk having first diametrically opposed portions of a first radius, and second diametrically opposed portions disposed perpendicular to said first diametrically opposed portions, said second diametrically opposed portions having a second radius smaller than said first radius;
a driven element disposed parallel to and between said ground plane and said parasitic element, comprising a flat, generally circular conducting disk having first diametrically opposed portions of a third radius, and second diametrically opposed portions disposed perpendicular to said first diametrically opposed portions of said third radius, said second diametrically opposed portions of said driven element having a fourth radius smaller than said third radius; and
feeding means, coupled to said driven element, for feeding radio-frequency current thereto, wherein said feeding means comprises a conducting strip disposed on an extension of a diameter of said driven element, physically coupled to said driven element and forming a substantially 45°
angle with said first plane of symmetry;
said first diametrically opposed portions of said parasitic element and said driven element being disposed in a first plane of symmetry perpendicular to and passing through centers of said parasitic element and said driven element; and
said second diametrically opposed portions of said parasitic element and said driven element being disposed in another plane of symmetry perpendicular to said first plane of symmetry and to said parasitic and driven elements, and passing through centers of said parasitic element and said driven element.
1 Assignment
0 Petitions
Accused Products
Abstract
A circularly polarized microstrip antenna has a ground plane, a disk-shaped driven element, and a disk-shaped parasitic element. The driven element is located between the ground plane and the parasitic element and is parallel to both of them. The driven element and parasitic element both have diametrically opposed notches, or diametrically opposed projections, or diametrically opposed notches and diametrically opposed projections. The driven element is coupled to a conducting strip that parallels the ground plane to form a microstrip transmission line.
-
Citations
13 Claims
-
1. A circularly polarized microstrip antenna, comprising:
-
a ground plane having a flat plate of conducting material; a parasitic element disposed parallel to said ground plane, having a flat, generally circular conducting disk having first diametrically opposed portions of a first radius, and second diametrically opposed portions disposed perpendicular to said first diametrically opposed portions, said second diametrically opposed portions having a second radius smaller than said first radius; a driven element disposed parallel to and between said ground plane and said parasitic element, comprising a flat, generally circular conducting disk having first diametrically opposed portions of a third radius, and second diametrically opposed portions disposed perpendicular to said first diametrically opposed portions of said third radius, said second diametrically opposed portions of said driven element having a fourth radius smaller than said third radius; and feeding means, coupled to said driven element, for feeding radio-frequency current thereto, wherein said feeding means comprises a conducting strip disposed on an extension of a diameter of said driven element, physically coupled to said driven element and forming a substantially 45°
angle with said first plane of symmetry;said first diametrically opposed portions of said parasitic element and said driven element being disposed in a first plane of symmetry perpendicular to and passing through centers of said parasitic element and said driven element; and said second diametrically opposed portions of said parasitic element and said driven element being disposed in another plane of symmetry perpendicular to said first plane of symmetry and to said parasitic and driven elements, and passing through centers of said parasitic element and said driven element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A circularly polarized microstrip antenna, comprising:
-
a ground plane having a flat plate of conducting material; a parasitic element disposed parallel to said ground plane, having a flat, generally circular conducting disk having first diametrically opposed portions of a first radius, and second diametrically opposed portions disposed perpendicular to said first diametrically opposed portions, said second diametrically opposed portions having a second radius smaller than said first radius; a driven element disposed parallel to and between said ground plane and said parasitic element, comprising a flat, generally circular conducting disk having first diametrically opposed portions of a third radius, and second diametrically opposed portions disposed perpendicular to said first diametrically opposed portions of said third radius, said second diametrically opposed portions of said driven element having a fourth radius smaller than said third radius; and feeding means, coupled to said driven element, for feeding radio-frequency current thereto, wherein said feeding means comprises a conducting strip, said ground plane is disposed between said conducting strip and said driven element, and said ground plane has a slot centered with respect to said driven element for coupling said conducting strip to said driven element; said first diametrically opposed portions of said parasitic element and said driven element being disposed in a first plane of symmetry perpendicular to and passing through centers of said parasitic element and said driven element; and said second diametrically opposed portions of said parasitic element and said driven element being disposed in another plane of symmetry perpendicular to said first plane of symmetry and to said parasitic and driven elements, and passing through centers of said parasitic element and said driven element; said slot being oriented at a substantially 90°
angle to said conducting strip, a substantially 45°
angle to said first plane of symmetry, and a substantially 45°
angle to said other plane of symmetry, and said conducting strip extending across a center of said slot. - View Dependent Claims (10, 11, 12, 13)
-
Specification