Single antenna for receipt of signals from multiple communications systems

A method for using a single antenna for simultaneously receiving first radio frequency signals in a first radio frequency L-band and second radio signals in a second Global Positioning System (GPS) navigation data radio frequency band different from the first radio frequency band, the method comprising:

• introducing a first received radio frequency signal in the first radio frequency L-band into a first port of a coupler;
• dividing the energy in the first received signal into two first received signals;
• introducing each of said two first received signals into second and third ports of said coupler;
• reflecting the energy in said two first received signals in frequency bands other than the second GPS navigation data radio frequency band;
• combining said energy in said two reflected first received signals into a first radio frequency L-band output signal;
• introducing a second received radio frequency signal in a second GPS navigation data radio frequency band different from the first radio frequency L-band into said first port of said coupler;
• dividing the energy in the second received signal into two second received signals;
• introducing each of said two second received signals into second and third ports of said coupler;
• and
• combining the energy in said two second received signals in the second GPS navigation data radio frequency band into a second GPS navigation data radio frequency band output signal.