US 12,341,243 B1
Helix antenna feed structure with coaxial impedance control
Phillip Kness, San Jose, CA (US); John F Sevic, Prescott, AZ (US); Joy Laskar, Cupertino, CA (US); and Romain Pelard, Redwood City, CA (US)
Assigned to Attotude, Inc., Menlo Park, CA (US)
Filed by Attotude, Inc., Menlo Park, CA (US)
Filed on Sep. 13, 2021, as Appl. No. 17/473,377.
Application 17/473,377 is a continuation of application No. 17/189,652, filed on Mar. 2, 2021, abandoned.
Application 17/189,652 is a continuation of application No. 16/893,963, filed on Jun. 5, 2020, abandoned.
Int. Cl. H01Q 1/50 (2006.01); H01Q 1/36 (2006.01); H01Q 11/08 (2006.01)
CPC H01Q 11/083 (2013.01) [H01Q 1/362 (2013.01); H01Q 1/50 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An antenna structure, comprising:
a helix radiating element; and
an impedance controlled coaxial interface having a first end and a second end opposite the first end, the first end coupled to the helix radiating element, the second end configured to receive a coaxial cable connector, the impedance controlled coaxial interface comprising an inner conductor, an outer conductor, and a medium separating the inner conductor from the outer conductor, the medium having a first section and a second section, the first section proximal to the first end and having a first cross-sectional area, the second section proximal to the second end and having a second cross-sectional area, the first cross-sectional area smaller than the second cross-sectional area;
wherein the first cross-sectional area and the second cross-sectional area are selected to achieve a desired controlled impedance so as to improve performance measured by at least one of directivity, gain, side-lobe suppression efficiency, and axial ratio.