Multiple ring microstrip antenna

摘要

A broadband microstrip antenna including two overlapping PC boards. A plurality of concentric spaced apart radiating rings and an upper ground plane layer are etched in the conductive upper surface of the upper PC board. An RF feedline network is etched in the conductive lower surface of the upper PC board. A continuous ground plane layer overlies the lower surface of the lower PC board. Plated through holes in the upper PC board connect a pair of 90 DEG spaced feed points on each of the rings to the feedline network. The feedline network is made of a plurality of conductive strips and matching stubs which are dimensioned and interconnected to permit the transmission/reception of circular polarized RF electromagnetic radiation while also matching the impedance of the rings to the impedance of a plurality of coaxial connectors mounted to the lower PC board.