Patent ID: 9590314
Date: 2017-03-07
CPC Classifications: H01Q

Claim:
1. A circularly polarized connected-slot antenna configured to receive radiation at global navigation satellite system (GNSS) frequencies, comprising: a dielectric substrate; a circular patch overlying the dielectric substrate; a first conductive ring surrounding the circular patch and overlying the dielectric substrate, the first conductive ring separated from the circular patch by a first connected slot; at least four impedance transformers overlying the dielectric substrate, each of the at least four impedance transformers including a microstrip and a ground pad that are separated by a first dielectric, each microstrip comprising at least two conductive traces, a first one of the at least two conductive traces having one end coupled to a first feed from a coaxial cable at an input and another end coupled to the circular patch at an output, a second one of the at least two conductive traces having one end coupled to the first feed and another end free from connection with a conductor, and each ground pad coupled to a ground from the coaxial cable and coupled to the first conductive ring, wherein the output associated with each microstrip is spaced from adjacent outputs associated with other microstrips by approximately equal angular intervals; and a metamaterial ground plane comprising: