Microstrip antenna with integral low-noise amplifier for use in global positioning system (GPS) receivers
 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. 
Trimble Navigation Limited
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Arthur N. Stanley L. Eugene
Woo Mason Tom