Trimble Navigation Limited

Eugene Tom

Arthur N Woo

Stanley L Mason

An embodiment of the present invention is a diagonally fed electric microstrip RHP antenna having a ceramic substrate, a groundplane on one side of the substrate, a rectangularly-shaped radiator attached to the other side of the substrate, and a via that passes through the substrate and connects to a point on the radiating electrode that provides a predetermined impedance Z.sub.o, the via has an inductance L.sub.via such that an optimum impedance for a minimum noise figure .GAMMA..sub.o is presented to the opposite end of the via. A groundplane relief in the first side of the dielectric substrate allows an active device to be connected to the second end of the via and placed within the groundplane relief. An output matching network also inside the groundplane relief is used for coupling the active device to an external system, such as a Global Positioning System (GPS) receiver.

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San Francisco, CA, United States of America

Eugene Tom