System for transmitting digital signals with FM signals
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1. A system for transmitting digital signals with FM signals, comprising:
- a coupler means for splitting a digital signal into a first digital signal part and a second digital signal part, and for splitting an FM signal into a first FM signal part and a second FM signal part;
a first transmission line means and a second transmission line means coupled to the coupler means for transmitting the first digital signal part, the second digital signal part, the first FM signal part, and the second FM signal part; and
antenna means for receiving the first digital signal part, the second digital signal part, the first FM signal part, and the second FM signal part from the first transmission line means and the second transmission line means.
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Abstract
A system for transmitting digital signals in the same band and on the same channel with FM signals is disclosed. The design of the system according to the present invention includes a coupler, which may be a +3 dB hybrid quadrature coupler, and circularly polarized antenna. The +3 dB hybrid quadrature coupler maintains isolation between the FM signals and the digital signals. The circularly polarized antenna receives the FM signals and the digital signals, and transmits the signals after they have each been separately received at the circularly polarized antenna.
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17 Claims
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1. A system for transmitting digital signals with FM signals, comprising:
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a coupler means for splitting a digital signal into a first digital signal part and a second digital signal part, and for splitting an FM signal into a first FM signal part and a second FM signal part;
a first transmission line means and a second transmission line means coupled to the coupler means for transmitting the first digital signal part, the second digital signal part, the first FM signal part, and the second FM signal part; and
antenna means for receiving the first digital signal part, the second digital signal part, the first FM signal part, and the second FM signal part from the first transmission line means and the second transmission line means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for transmitting digital signals and FM signals, comprising:
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splitting a digital signal into a first digital part and a second digital part, such that there is a 90 degrees phase difference between each part using a hybrid quadrature coupler;
splitting an FM signal into a first FM part and a second FM part, such that there is a 90 degrees phase difference between each part using a +3 dB hybrid quadrature coupler; and
transmitting a first pair of signals and a second pair of signals using a first transmission line and a second transmission line, wherein each pair of signals includes at least one of the digital signal first part and the digital signal second part, and including at least one of the FM signal first part and the FM signal second part, wherein there is a 90 degrees phase difference between the pair of signals. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus for transmitting digital and analog FM signals, comprising:
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a +3 db hybrid quadature coupler having at least a first and second input, and at least a first and second output;
a first input signal having at least one of a digital and analog FM signal;
a second input signal having at least one of a digital and analog FM signal; and
an antenna having at least a first and second radiator of orthogonal polarization, wherein the hybrid coupler splits each of the at least one of the digital and FM signals, of both the first and second inputs, into substantially equal parts, each part being shifted approximately 90 degrees from its split part, and wherein the antenna radiates the split parts having the shifted phases to form a radiated digital and radiated analog FM signal. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification