Patent ID: 6181295
Filing Date: 2001-01-30
Classification: H01P,H01Q

Abstract:
A resonant helix antenna comprising at least one helix formed by at least two radiating strands printed on a substrate, characterised in that said antenna comprises a miniturised structure for the wideband supply of said radiating strands, that is printed on said substrate and comprises at least one hybrid coupler made out of semi-localised elements, said semi-localised elements are designed according to following steps:designing said coupler with conventional distributed stripline elements, each of them having at least a .lambda./4 length:turning each of said distributed stripline element into lumped elements, each of them being a .pi. cell made of one capacitance C and two inductances L, L';turning each of said capacitances and inductances into semi-localised elements, each of said inductances being turned into a reduced width line and each of capacitance into a larger width line, each of said line being smaller than .lambda./4;so that the space requirement of said supply structure is smaller than .lambda./4, .lambda. being the maximum wavelength of operation of said antenna.