Patent ID: 6748197
Filing Date: 2004-06-08
Classification: H04B

Abstract:
A method for using a single antenna for simultaneously receiving radio frequency signals in a first L-band radio frequency and Global Positioning System (GPS) data signals in a second radio frequency band very near the first L-band radio frequency, the method comprising:coupling a shared antenna to a four-way directional coupler; tuning the coupler to L-band and GPS data band radio frequencies; feeding a received radio frequency into the coupler and dividing and phase shifting the energy in the received radio frequency signal into a first L-band radio frequency signal and a second GPS data band radio frequency signal; feeding the first L-band radio frequency signal into a first band pass filter and reflecting back into said coupler the energy in said two received radio frequency signals in frequency bands other than the first L-band radio frequency; using a bandpass filter, feeding the second GPS data band radio frequency signal into a second band pass filter and reflecting back into said coupler the energy in said two received radio frequency signals in frequency bands other that the second GPS data radio frequency band; and combining said energy in said two reflected signals into a first radio frequency output signal.