Patent ID: 8909161

Claim:
A transceiver front-end of a communication device comprising: a transmit frequency blocking arrangement connected to a signal transmission and reception node and a transmitter node, transmit frequency blocking arrangement having a blocking frequency interval associated with the transmit frequency and a non-blocking frequency interval associated with the receive frequency, said transmit frequency blocking arrangement being configured to block passage of transmit frequency signals between the signal transmission and reception arrangement and the receiver; a receive frequency blocking arrangement connected to the signal transmission and reception node and a receiver node, said receive frequency blocking arrangement having a blocking frequency interval associated with the receive frequency and a non-blocking frequency interval associated with the transmit frequency, said receive frequency blocking arrangement being configured to block passage of transmit frequency signals between the signal transmission and reception arrangement and the transmitter; wherein said transmit frequency blocking arrangement comprises a network of passive components including at least one transformer and a first filter arrangement configured to have a higher impedance value at the transmit frequency than at the receive frequency; and wherein said receive frequency blocking arrangement comprises a second filter arrangement configured to have a higher impedance value at the transmit frequency than at the receive frequency, and a third filter arrangement configured to have a higher impedance value at the receive frequency than at the transmit frequency.