Radio frequency communication devices and methods
View Patent ↗One embodiment relates to a circuit for efficient wireless communication. The circuit includes a communication port adapted to be coupled to an antenna feed. Multiple communication paths stem from the communication port, where different communication paths are associated with different frequency bands. Multiple phase shift selection circuits are respectively associated with the multiple communication paths. The phase shift selection circuits have different respective impedances relative to the communication port and the respective impedances vary for the different frequency bands. Other methods and systems are also disclosed.
1. A circuit for efficient wireless communication, comprising:
a transmission communication port configured to couple to a single antenna;
a reception communication port, separate from the transmission communication port, and configured to couple to the single antenna, and wherein both the transmission communication port and the reception communication port are configured to interface with the single antenna concurrently when the single antenna is coupled thereto;
a signal generator configured to generate a transmission signal in one of a plurality of different transmission frequency bands;
a plurality of amplifiers, wherein each one of the plurality of amplifiers is associated with a respective one of the plurality of frequency bands, and wherein the signal generator is configured to direct the transmission signal to the appropriate amplifier based on the frequency band in which the generated transmission signal resides;
a plurality of transmission phase shift selection circuits respectively associated with the plurality of amplifiers, wherein each of the plurality of transmission phase shift selection circuits exhibits a unique impedance associated with the respective frequency band, thereby passing signal frequencies within the respective frequency band and rejecting signal frequencies outside the respective frequency band, wherein an output of each of the plurality of transmission phase shift selection circuits is connected to the transmission communication port;
a plurality of reception phase shift selection circuits, wherein each one of the plurality of reception phase shift selection circuits are associated with one of a plurality of different reception frequency bands, and wherein each of the plurality of reception phase shift selection circuits exhibit a unique impedance associated with their respective reception frequency band, thereby passing signal frequencies within the respective reception frequency band and rejecting signal frequencies outside the respective reception frequency band;
a plurality of low noise amplifiers, wherein each one of the low noise amplifiers is associated with a respective one of the plurality of reception phase shift selection circuits; and
a demodulator configured to receive a signal from each of the plurality of low noise amplifiers, wherein the demodulator is configured to receive and demodulate the signals to produce received data.
2. The circuit of claim 1 , where each of the phase shift selection circuits comprise one or more passive circuits that are configured to provide different combinations of filtering and phase shifting for each phase shift selection circuit.
3. The circuit of claim 1 , where each of the phase shift selection circuits comprise:
a filter element adapted to pass the respective frequency band.
4. The circuit of claim 3 , where the phase shift selection circuits further comprise:
a microstrip line between the transmission or reception communication port, respectively, and the filter element.
5. The circuit of claim 1 , wherein the single antenna comprises a high isolation dual feed antenna.
6. The circuit of claim 5 , wherein the transmission communication port is connected to a transmission feed of the high isolation dual feed antenna, and the reception communication port is connected to a reception feed of the high isolation dual feed antenna.
7. The circuit of claim 5 , wherein the high isolation dual feed antenna comprises a planar inverted F antenna.