Patent ID: 9614292
Date: 2017-04-04
CPC Classifications: H01Q

Claim:
1. A broad-band circularly-polarized antenna comprising: at least four monopole antenna elements having respective at least four radiating surfaces with respective at least four normals, the at least four monopole antenna elements arranged around a vertical axis so that the at least four normals of the at least four respective radiating surfaces are perpendicular to the vertical axis and point away from the vertical axis, wherein the at least four monopole antenna elements are connected to a ground reference; at least one feed network having at least four contact regions, wherein the feed network is communicatively coupled to at least four respective edge portions of the at least four monopole antenna elements via the at least four contact regions, wherein a first monopole antenna element is driven with a first driving phase offset by 90 degrees from a second driving phase used to drive a second monopole antenna element, wherein a second radiating surface of the second monopole antenna element is orthogonally arranged with reference to a first radiating surface of the first monopole antenna element, wherein the second driving phase is offset by 90 degrees from a third driving phase used to drive a third monopole antenna element, a third radiating surface of the third monopole antenna element being orthogonally arranged with reference to the second radiating surface of the second monopole antenna element, and the third radiating surface of the third monopole antenna element being oppositely directed from the first radiating surface of the first monopole antenna element, wherein the third driving phase is offset by 90 degrees from a fourth driving phase used to drive a fourth monopole antenna element, a fourth radiating surface of the fourth monopole antenna element being orthogonally arranged with reference to both the third radiating surface of the third monopole antenna element and the first radiating surface of the first monopole antenna element, and the fourth radiating surface of the fourth monopole antenna element being oppositely directed from the second radiating surface of the second monopole antenna element.