Patent ID: 9203455
Filing Date: 2015-12-01
Classification: H04B

Abstract:
1. An apparatus, comprising: receiving circuitry configured to form a signal receiving path arranged for transferring communication signals received via air interface; transmitting circuitry configured to form a signal transmission path arranged for transferring communication signals to be transmitted via air interface; and interference cancellation circuitry in operable connection between the signal receiving path and the signal transmission path, wherein the receiving circuitry and the transmitting circuitry are configured to receive and transmit communication signals at the same time and at the same frequency, wherein the interference cancellation circuitry is configured to provide an isolation range between the signal receiving path and the signal transmission path that includes the center of a communication band for the signals received and/or to be transmitted via air interface, the interference cancellation circuitry comprising a first interference cancellation stage which comprises a first circuit design or a second circuit design, wherein the first circuit design comprises a first parallel branch having an inductance element and a second parallel branch having a capacitance element, and the second circuit design comprises a first parallel branch having an inductance element, a second parallel branch having a capacitance element, and a third parallel branch having a resistance element, the interference cancellation circuitry additionally comprising a second interference cancellation stage and a third interference cancellation stage both comprising the second circuit design that is arranged in serial connection with the first interference cancellation stage.