Antenna feed network for full duplex communication

A wireless communication device for effecting two way wireless communication including interconnecting a transmitter, and a receiver, said wireless communication device comprising:

• an antenna structure having first and second antenna structure ports and said antenna structure being configured to:
• accept first and second antenna feed signals respectively at said first and second antenna structure ports with said first antenna feed signal shifted a feed signal phase difference relative to said second antenna feed signal and to emit said first and second antenna feed signals as a common radiated wave, and
• emit at least one of a first received signal or a second received signal respectively from said first and second antenna structure ports in response to excitation by a received radiation wave;
• said antenna structure being configured such that:
• a first antenna structure leakage signal is leaked to said first antenna structure port and is a portion of said second antenna feed signal;
• and
• a second antenna structure leakage signal is leaked to said second antenna structure port and is a portion of said first antenna feed signal;
• an antenna feed network;
• first and second antenna connections respectively connecting said first and second antenna structure ports said antenna feed network;
• said antenna feed network comprising:
• a signal divider for receiving said transmission signal from said transmitter and dividing said transmission signal into first and second divided transmission signals having substantially equal amplitudes and a first relative phase shift therebetween;
• a first routing device having a first port, a second port and a third port, said first routing device routing said first divided transmission signal, applied to said first port, to said second port, said second port being connected to said first antenna structure port via said first antenna connection and outputting said first divided transmission signal as said first antenna feed signal while passing a portion of said first divided transmission signal to said third port as a first routing device leakage signal;
• said first routing device being configured to accept said first received signal at said second port, of said first routing device, from said first antenna structure port, when present, and route said first received signal to said third port of said first routing device;
• a second routing device having a first port, a second port and a third port, said second routing device routing said second divided transmission signal, applied to said first port of said second routing device, to said second port, of said second routing device, said second port being connected to said second antenna structure port via said second antenna connection and outputting said second divided transmission signal as said second antenna feed signal while passing a portion of said second divided transmission signal to said third port, of said second routing device, as a second routing device leakage signal;
• said second routing device being configured to accept said second received signal, when present, at said second port, of said second routing device, from said second antenna structure port, and route said second received signal to said third port of said second routing device;
• a signal combiner having first and second combiner inputs and a received signal output for connection to said receiver to deliver a portion of said first and second received signals thereto, said first and second combiner inputs being respectively connected to said third ports of said first and second routing devices, said signal combiner being configured to introduce a second relative phase shift between signals applied to said first and second combiner inputs and combine said signals applied at said first and second combiner inputs such that:
• at least portions of any of said first or second received signals, when present, respectively at said first and second combiner inputs, are directed to said received signal output to provide said portion of said first and second received signals;
• and
• said first and second routing device leakage signals are directed to and destructively combined at said received signal output;
• said first routing device receiving said first antenna structure leakage signal at said second port and emitting, at said third port thereof, a first antenna structure leakage output signal which is a portion of said first antenna structure leakage signal;
• said second routing device receiving said second antenna structure leakage signal at said second port and emitting, at said third port thereof, a second antenna structure leakage output signal which is a portion of said second antenna structure leakage signal;
• said signal combiner having said first combiner input receiving a first combined signal including at least said first routing device leakage signal and said first antenna structure leakage output signal, and said second combiner input receiving a second combined signal including at least said second routing device leakage signal and said second antenna structure leakage output signal, said signal combiner being so configured as to combine said first and second antenna structure leakage output signals at said received signal output;
• and
• a signal imbalancing device applied to at least one of:
• a first signal path including said first antenna connection and said first routing device;
• or
• a second signal path including said second antenna connection and said second routing device;
• such that an imbalance in transmission characteristics of said first signal path and said second signal path results and imbalances said first combined signal versus said second combined signal to effect at least partial cancellation of said first and second antenna structure leakage output signals at said received signal output.

A wireless communication device for effecting two way wireless communication including interconnecting first and second transmitters, and at least one receiver, said wireless communication device comprising:

• an antenna structure having first, second, third, and fourth antenna structure ports;
• said antenna structure being configured to:
• accept first and second antenna feed signals respectively at said first and second antenna structure ports with said first antenna feed signal shifted a feed signal phase difference relative to said second antenna feed signal and to emit said first and second antenna feed signals as a common radiated wave;
• emit at least one of a first received signal or a second received signal respectively from said first or second antenna structure ports in response to excitation by a received radiation wave;
• accept third and fourth antenna feed signals respectively at said third and fourth antenna structure ports with said third antenna feed signal shifted said feed signal phase difference relative to said fourth antenna feed signal or to emit said third or fourth antenna feed signals as a common radiated wave;
• or
• emit at least one of a third received signal or a fourth received signal respectively from said third or fourth antenna structure ports in response to excitation by a received radiation wave;
• a first antenna feed network having:
• a transmission signal input for receiving a transmission signal from said first transmitter and splitting said transmission signal into first and second antenna feed signals having said feed signal phase difference therebetween;
• and
• a receiver output for outputting a portion of said first or second received signals to said at least one receiver;
• first and second antenna connections respectively connecting said first and second antenna structure ports to said first antenna feed network for outputting said first and second antenna feed signals to said first and second antenna structure ports;
• a second antenna feed network having:
• a transmission signal input for receiving a transmission signal from said second transmitter and splitting said transmission signal into third and fourth antenna feed signals having said feed signal phase difference therebetween;
• and
• a receiver output for outputting a portion of said third or fourth received signals to said receiver;
• and
• third and fourth antenna connections respectively connecting said third and fourth antenna structure ports to said second antenna feed network for outputting said third and fourth antenna feed signals to said third and fourth antenna structure ports.

A wireless communication device for effecting two way wireless communication including interconnecting a transmitter, and a receiver, said wireless communication device comprising:

• an antenna structure including first, second, third, and fourth antenna structure ports;
• said antenna structure configured to:
• accept first and second antenna feed signals respectively at said first and second antenna structure ports with said first antenna feed signal shifted a feed signal phase difference relative to said second antenna feed signal and to emit said first and second antenna feed signals as a common radiated wave;
• and
• emit a first received signal and a second received signal respectively from said third and fourth antenna structure ports having a received signal phase difference therebetween in response to excitation by a received radiation wave;
• a signal splitter device configured to divide a transmission signal into said first and second antenna feed signals having a transmit phase shift therebetween, said antenna feed network having:
• a transmission signal input for receiving said transmission signal from said transmitter;
• first and second splitter ports respectively connected to said first and second antenna structure ports for outputting said first and second antenna feed signals to said first and second antenna structure ports;
• a signal combiner device having:
• first and second combiner ports respectively connected to said third and fourth antenna structure ports for accepting said first and second received signals;
• and
• a receiver output;
• said antenna signal combiner device being configured to combine signals applied to said first and second combiner ports and emit a combined signal output from said receiver output for application to said receiver;
• and
• first and second antenna connections respectively connecting said first and second splitter ports to said first and second antenna structure ports, and third and fourth antenna connections respectively connecting said first and second combiner ports to said third and fourth antenna structure ports.