Tunable duplexer arrangement configured for TDD operation

A radio frequency (RF) duplexing system comprising:

• a first duplexer comprising a first tunable RF filter and a second tunable RF filter;
• and
• a control circuit operable in a full duplexing transmission mode and in a half duplexing receive mode, wherein the control circuit is configured to:
• tune the first tunable RF filter in the full duplexing transmission mode so that the first tunable RF filter defines a transmission passband;
• tune the second tunable RF filter in the full duplexing transmission mode so that the second tunable RF filter defines a receive passband;
• tune the second tunable RF filter in the half duplexing receive mode so that the second tunable RF filter defines the receive passband;
• and
• tune the first tunable RF filter in the half duplexing receive mode so that the first tunable RF filter enhances the receive passband.

A method of duplexing comprising:

• tuning a first tunable RF filter in a full duplexing transmission mode so that the first tunable RF filter defines a transmission passband;
• tuning a second tunable RF filter in the full duplexing transmission mode so that the second tunable RF filter defines a receive passband;
• tuning the first tunable RF filter in a time division duplexing mode during a transmission time period so that the first tunable RF filter defines the transmission passband;
• tuning the second tunable RF filter in the time division duplexing mode during the transmission time period so that the second tunable RF filter enhances the transmission passband;
• tuning the second tunable RF filter in the time division duplexing mode during a receive time period so that the second tunable RF filter defines the receive passband;
• and
• tuning the first tunable RF filter in the time division duplexing mode during the receive time period so that the first tunable RF filter enhances the receive passband.