System for transmitting digital signals with FM signals

Details System for transmitting digital signals with FM signals System for transmitting digital signals with FM signals

2005-08-23

2005-08-23

Matar, Ahmad F. (Department: 2642)

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

C455S103000, C455S104000, C455S105000

Reexamination Certificate

active

06934514

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.

REFERENCES:
patent: 5555016 (1996-09-01), Rhodes et al.
patent: 6549242 (2003-04-01), Plonka

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