Patent ID: 7142170
Filing Date: 2006-11-28
Classification: H01Q

Abstract:
1. A multifilar helix antenna comprising: a cylindrical substrate; and a plurality of helical antenna filaments spaced apart from each other at a regular interval about a longitudinal axis of the antenna, wherein each of said helical antenna filaments has a length, each of said helical antenna filaments comprises a track located on the cylindrical substrate, and each of said helical antenna filaments has a periodic meander along its length, the periodic meander having a square wavelength pattern of periodic elements, each periodic element having a length 2ΔL, the square wavelength pattern having a height ΔA=W−w, where W is width of each periodic element and w is width of the track of said filament, and β=ΔA/ΔL and is at least 0.25.