Transmitting and receiving apparatus for satellite communication via dual-polarized signals

An apparatus for transmitting signals to and receiving signals from a source, comprising:

• a transmit/receive feed operable to transmit signals to and receive signals from a source, wherein the received signals comprise simultaneously dual-polarized signals containing two components of different polarizations;
• a waveguide assembly coupled with the transmit/receive feed for propagating transmitted and received signals to and from the transmit/receive feed;
• and
• a receive isolation filter coupled with the waveguide assembly and operable to filter the dual-polarized received signals without separating the two components thereof and to provide the filtered dual-polarized received signals to a receiver so as to isolate the receiver from signals transmitted by the transmit/receive feed, wherein the receive isolation filter comprises a plurality of sequentially arranged cylindrical cavities of different internal diameters.