Microstrip antenna with integral low-noise amplifier for use in global positioning system (GPS) receivers
First Claim
1. A microstrip antenna system, comprising:
- a flat dielectric substrate having a pair of opposite first and second sides;
a high-gain, low-noise transistor mounted to the dielectric substrate on said first side and having a first port impedance;
a groundplane electrode disposed on said first side of the dielectric substrate and including an opening for surrounding the transistor;
a rectangularly-shaped, diagonally-fed dipole antenna radiating electrode disposed on said second side of the dielectric substrate and opposite to the transistor and groundplane electrode; and
an inductive connection between the transistor and the radiating electrode at a critical diagonal feeding point on the radiating electrode that matches said first port impedance, wherein the inductive connection has an inductance value and makes connection to said critical point on the radiating electrode that is equivalent to a predetermined impedance Zo and a noise figure minimum, with respect to the transistor.
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Accused Products
Abstract
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 Zo, the via has an inductance Lvia such that an optimum impedance for a minimum noise figure Γo 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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Citations
11 Claims
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1. A microstrip antenna system, comprising:
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a flat dielectric substrate having a pair of opposite first and second sides; a high-gain, low-noise transistor mounted to the dielectric substrate on said first side and having a first port impedance; a groundplane electrode disposed on said first side of the dielectric substrate and including an opening for surrounding the transistor; a rectangularly-shaped, diagonally-fed dipole antenna radiating electrode disposed on said second side of the dielectric substrate and opposite to the transistor and groundplane electrode; and an inductive connection between the transistor and the radiating electrode at a critical diagonal feeding point on the radiating electrode that matches said first port impedance, wherein the inductive connection has an inductance value and makes connection to said critical point on the radiating electrode that is equivalent to a predetermined impedance Zo and a noise figure minimum, with respect to the transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification