Multiplexer for cellular telephone
First Claim
Patent Images
1. A multiplexer circuit comprising:
- a first connection terminal for connection to a first antenna arranged for transmitting and receiving signals in a first cellular frequency range;
a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second cellular frequency range, discrete from and higher than said first cellular frequency range; and
a third connection terminal for connection to a cellular telephone adapted to receive both first and second cellular frequency ranges;
said multiplexer circuit further comprising a first single receiving and transmitting filter circuit connected between said first connection terminal and said third connection terminal for excluding signals outside of said first cellular frequency range and a second single receiving and transmitting filter circuit connected between said second connection terminal and said third connection terminal for excluding signals outside said second cellular frequency range.
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Accused Products
Abstract
A multiplexer circuit adapted to receive standard cellular telephone signals and PCS signals without user intervention comprises two filter circuits. The first filter circuit presents a high impedance to signals outside the standard cellular frequency range from one antenna and the second circuit presents a high impedance to signals outside the higher PCS frequency range from a second antenna. A cell phone adapted to receive both frequency ranges will automatically detect the appropriate signal.
36 Citations
12 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 cellular frequency range;
a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second cellular frequency range, discrete from and higher than said first cellular frequency range; and
a third connection terminal for connection to a cellular telephone adapted to receive both first and second cellular frequency ranges;
said multiplexer circuit further comprising a first single receiving and transmitting filter circuit connected between said first connection terminal and said third connection terminal for excluding signals outside of said first cellular frequency range and a second single receiving and transmitting filter circuit connected between said second connection terminal and said third connection terminal for excluding signals outside said second cellular frequency range. - View Dependent Claims (2, 3)
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4. A multiplexer circuit for coupling antennae to radio apparatus operative in a CB frequency range and in a weather band frequency range and to cellular telephone apparatus operating in first and second cellular frequency ranges, the multiplexer circuit comprising:
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a plurality of input terminals for connection to said antennae;
a first output conductor for connection to said radio apparatus;
a second output conductor for connection to said cellular apparatus;
a first series L-C circuit connected between a first of said input terminals and said first output conductor, said first series L-C circuit providing a blocking impedance to signals outside of the CB frequency range;
a second series L-C circuit connected in parallel with said first series L-C circuit, said second L-C circuit providing a blocking impedance to signals outside of said weather band frequency range;
a third series L-C circuit connected between one of said input terminals and said second output conductor and providing a blocking impedance to signals outside said first cellular frequency range; and
a fourth series L-C circuit connected between one of said input terminals and said second cellular output conductor and providing blocking impedance to signals outside said second cellular frequency range.
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5. A multiplexer circuit for selectively coupling an antenna to CB radio apparatus and to FM radio apparatus and to cellular telephone apparatus, the multiplexer circuit comprising:
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an input conductor for connection to the antenna;
a first output conductor for connection to a CB radio apparatus;
a second output conductor for connection to a FM radio apparatus;
a third output conductor for connection to a cellular telephone apparatus; and
a series L-C circuit connected between the input conductor and the first output conductor and comprising a first inductor and a first capacitor connected in series and providing a blocking impedance to signals in the FM range. - View Dependent Claims (6, 7)
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8. 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 cellular frequency range;
a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second cellular frequency range, discrete from and higher than said first cellular frequency range; and
a third connection terminal for connection to a cellular telephone adapted to receive both first and second cellular frequency ranges;
said multiplexer circuit further comprising a first single receiving and transmitting filter circuit connected between said first connection terminal and said third connection terminal for excluding signals in said second cellular frequency range and a second single receiving and transmitting filter circuit connected between said second connection terminal and said third connection terminal for excluding signals in said first cellular frequency range. - View Dependent Claims (9, 10)
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11. 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 cellular frequency range;
a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second cellular frequency range, discrete from and higher than said first cellular frequency range; and
a third connection terminal for connection to a cellular telephone adapted to receive both first and second cellular frequency ranges;
said multiplexer circuit further comprising a first filter circuit connected between said first connection terminal and said third connection terminal for excluding signals outside of said first cellular frequency range and a second filter circuit connected between said second connection terminal and said third connection terminal for excluding signals outside said second cellular frequency range wherein the first filter circuit comprises a first capacitor and a first inductor connected in series and wherein the second filter circuit comprises a second capacitor and a second inductor connected in series. - View Dependent Claims (12)
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Specification