Dual band octafilar antenna
AssigneeHarris Solutions Ny, Inc.
InventorsMalcolm J. Packer, Joseph D. Majkowski
Life of this patent
Estimating the term…
Abstract
Antenna system includes first and second quadrifilar radiating elements. A first one of the quadrifilar radiating elements (QRE) is comprised of a plurality of first bifilar helical loops (BHLs). The BHLs are oriented in a mutual orthogonal relationship on a common axis. A second QRE shares a common feed structure with the first QRE. The second QRE comprises a plurality of second BHLs oriented in a mutual orthogonal relationship on the common axis. The first QRE is tuned for operation in a first frequency band, the second QRE is tuned for operation in a second frequency band different from the first frequency band.
Claims25
An antenna system, comprising:
- a first quadrifilar radiating element (QRE) comprising a plurality of first bifilar helical loops (BHLs) oriented in a mutual orthogonal relationship on a common axis, each first BHL comprising a pair of elongated conductive legs which define a plurality of turns about said common axis at a first pitch angle and having a first turn radius;
- a second QRE sharing a common feed structure with the first QRE, the second QRE comprising a plurality of second BHLs oriented in a mutual orthogonal relationship on the common axis, each second BHL comprising a pair of elongated conductive legs which define a plurality of turns about the common axis at a second pitch angle and having a second turn radius;
- wherein the first QRE is tuned for operation in a first frequency band, the second QRE is tuned for operation in a second frequency band different from the first frequency band, and the first radius is substantially the same as the second radius.
A method for providing a dual-band antenna system, comprising:
- for radio frequency operations in a first frequency band using a first quadrifilar radiating element (QRE) comprising a plurality of first bifilar helical loops (BHLs) oriented in a mutual orthogonal relationship on a common axis, each first BHL comprising a pair of elongated conductive legs which define a plurality of turns about said common axis at a first pitch angle and having a first turn radius;
- for radio frequency operations in a second frequency band different from the first frequency band, using a second QRE which shares a common feed structure with the first QRE;
- arranging the second QRE to include a plurality of second BHLs oriented in a mutual orthogonal relationship on the common axis, each second BHL comprising a pair of elongated conductive legs which define a plurality of turns about the common axis at a second pitch angle and having a second turn radius;
- tuning a configuration of the first and second QRE so that the first radius is substantially equal to the second radius, whereby the elongated conductive legs comprising the first QRE can be disposed on a same cylindrical shell as the elongated conductive legs comprising the second QRE.
Dependencies are inferred from the claim text.