Multiplexer for sorting multiple signals from an antenna
First Claim
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1. A multiplexer circuit comprising:
- a first connection terminal for connection to a first antenna arranged for transmitting and receiving signals in a first frequency range;
a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second frequency range, discrete from and higher than said first frequency range; and
a third connection terminal for connection to a signal processor adapted to receive the first frequency range;
a fourth connection terminal for connection to a signal processor adapted to receive the second frequency range;
said multiplexer circuit further comprising a first filter circuit connected between said first connection terminal and said fourth connection terminal for excluding signals outside of said first frequency range and a second filter circuit connected between said second connection terminal and said third connection terminal for excluding signals outside said second frequency range.
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Abstract
A multiplexer circuit adapted to receive signals comprises two filter circuits. The first filter circuit presents a high impedance to signals outside a first frequency range and the second circuit presents a high impedance to signals outside a second frequency range. Isolation matching circuits enable transmission and reception of one of the signals in the first or second frequency ranges without degradation or interference with the other range. An embodiment allows transmission and reception of satellite Orbcomm frequencies over a standard AM/FM antenna without effect on the AM/FM signal.
49 Citations
3 Claims
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1. A multiplexer circuit comprising:
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a first connection terminal for connection to a first antenna arranged for transmitting and receiving signals in a first frequency range;
a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second frequency range, discrete from and higher than said first frequency range; and
a third connection terminal for connection to a signal processor adapted to receive the first frequency range;
a fourth connection terminal for connection to a signal processor adapted to receive the second frequency range;
said multiplexer circuit further comprising a first filter circuit connected between said first connection terminal and said fourth connection terminal for excluding signals outside of said first frequency range and a second filter circuit connected between said second connection terminal and said third connection terminal for excluding signals outside said second frequency range. - View Dependent Claims (2, 3)
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Specification