Switchless band separation for transceivers

摘要

A system includes a plurality of band pass filters to pass signals in separated frequency bands to or from an antenna. A matching network provides characteristic impedances. The system is designed such that the configuration of the matching network and BPFs provides high impedance to the band pass filters for those routing paths other than the band pass path as these routing paths do not transmit or receive the signals at this particular pass band. The system is further designed such that the configuration of the matching network and BPFs provides minimal insertion loss for the band pass path of for transmission and receipt of signals at this particular pass band, where each routing path has a corresponding pass band. The matching network is for coupling to an amplifier, when frequency separation is needed at the output of the amplifier to the BPFs. In one embodiment an impedance network tunes the impedance by using varying length transmission lines.

主权项

1. A system, comprising:
a signal source; a first plurality of impedance matched networks connected to the signal source; a plurality of band pass filters to pass signals in separated frequency bands, connected to respective ones of the first plurality of impedance matched networks; and a second plurality of impedance matching networks, connected to respective ones of the plurality of band pass filters (BPF); a transmit antenna connected to the second plurality of impedance matching networks; wherein the first plurality of impedance matched networks is configured to provide frequency band selection and direct signals in respective band to the corresponding one of the plurality of band pass filters; wherein the second plurality of impedance matched networks is configured to direct signals in the respective bands to the transmit antenna and prevent signal leakages into incorrect signal paths; wherein the first and second matching networks are switchless.