Small size receiver band self-interference cancellation amplifier for 4G transceivers

One of the main challenges in 4G base station transceivers today is to achieve high enough RF isolation between the transmitter and the receiver. Conventionally a large and expensive cavity filter design is required. We propose a novel small size receiver band self-interference cancellation amplifier solution that can reduce the filtering requirements up to 40dB and thus reduce filter size significantly (e.g. 30...40%).