All-band GNSS Antenna with Artificial Magnetic Conductor

With the introduction of multiple GNSS service providers, antennas that cover all GNSS bands become especially important. All-band GNSS antenna must cover 1146 MHz-1610 MHz band, have high front to back ratio, and good axial ratio with large beamwidth for better satellite coverage. Although many antenna topologies exist for broadband operation, circularly polarized (CP) broadband antennas that simultaneously have impedance and axial ratio wide bandwidths are scarce. Especially for GNSS applications, antenna performance can be demanding depending on the application and limited space provided for the antenna. To overcome these shortcomings, crossed pie-shaped printed dipole antenna with artificial magnetic conductor (AMC) reflector is proposed. We also propose a unique feed structure that does not utilize hybrid coupler and provide wideband operation for the target frequency band. The proposed antenna is realized and measurement results are corroborated with simulations.