A novel conical choke ring ground plane is proposed for GPS antennas used in precise geodetic applications. The proposed choke ring configuration allows better reception of low elevation angle GPS satellites and improved multipath rejection. The proposed ground plane is composed as a three-dimensional array of coaxial slots. To further reduce the reception of multipath signals generated below the horizon, an additional array of coaxial slots is disposed underneath the ground plane. This arrangement reduces the overall weight of the structure. This paper will describe the mechanical structure of the three-dimensional choke ring ground plane, as well as present test results of the new design compared with traditional two-dimensional ground planes.
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