Diversity apparatus for a global positioning system antenna
First Claim
1. A diversity apparatus for a global positioning system antenna comprising;
- a pair of antennas;
a pair of low noise amplifiers, each being connected to a corresponding one of the antennas;
a pair of amplification and comparison units for amplifying an RF signal received through the corresponding antenna and for comparing the amplified signal with a reference signal, each amplification and comparison unit generating an output;
a pair of common lines for passing the received RF signal from the corresponding antenna and for supplying a DC voltage from an external power source to the corresponding low noise amplifier;
a pair of switching units for passing an AC signal from the corresponding one of the common lines and for blocking a DC signal; and
selection means for selecting one of the switching units in response to the outputs from the amplification and comparison units so that a signal from the selected switching unit is output, the selection means comprising a J-K flip-flop being operated in response to outputs of the amplification and comparison units and a pair of diodes with their outputs connected to each other for supplying their connected output signals as a clock pulse to the flip-flop.
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Accused Products
Abstract
A diversity apparatus for a global positioning system antenna capable of selectively using a better receiving sensitivity antenna among antennas is disclosed. The invention includes at least two antennas; first and second amplification comparing means for amplifying signals received from the antenna through a low noise amplifier and a coupling line and for comparing a direct current with a base voltage; selection means for selecting one antenna among the antennas by activating an impedance line; and first and second connection means for determining from the amplified signals, which of the antenna signals to output, and outputting the alternating current signal from that antenna.
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Citations
5 Claims
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1. A diversity apparatus for a global positioning system antenna comprising;
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a pair of antennas; a pair of low noise amplifiers, each being connected to a corresponding one of the antennas; a pair of amplification and comparison units for amplifying an RF signal received through the corresponding antenna and for comparing the amplified signal with a reference signal, each amplification and comparison unit generating an output; a pair of common lines for passing the received RF signal from the corresponding antenna and for supplying a DC voltage from an external power source to the corresponding low noise amplifier; a pair of switching units for passing an AC signal from the corresponding one of the common lines and for blocking a DC signal; and selection means for selecting one of the switching units in response to the outputs from the amplification and comparison units so that a signal from the selected switching unit is output, the selection means comprising a J-K flip-flop being operated in response to outputs of the amplification and comparison units and a pair of diodes with their outputs connected to each other for supplying their connected output signals as a clock pulse to the flip-flop. - View Dependent Claims (2, 3, 4)
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5. A diversity apparatus for a global positioning system antenna, comprising:
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at least two antennas; first and second amplification and comparison means for amplifying signals received from the antennas and for comparing a DC component of the signals with a base voltage, each comparison means generating an output; selection means for receiving the outputs of the comparison means and for selecting one antenna among the antennas based upon the state of the outputs, the selection means comprising i) a plurality of diodes for passing a DC component of the output signals of the comparison means, the outputs of the diodes being connected;
ii) an invertor for inverting the connected outputs of the diodes;
iii) an impedance line for selecting from among the antenna outputs; and
iv) a flip-flop receiving as inputs the connected outputs of the diodes and the outputs of the comparison means, the flip-flop comprising a pair of output terminals connected to the impedance line for controllably selecting from among the antenna outputs based upon the state of the inputs to the flip-flop; andfirst and second connection means for receiving the amplified output of the selected antenna, for cutting off a DC component of the selected amplified antenna output, and for outputting an AC component of the selected amplified antenna output.
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Specification