Dual-band radio terminal and filter structure

A terminal for dual-band radio communication with spacecrafts, the terminal comprising:

• an antenna unit configured to exchange radio-frequency signals (RFR;
• RFT) bidirectionally with the spacecrafts;
• a first amplifying and frequency-mixing circuitry con-figured to up convert an outgoing modulated signal (Tx) to be fed through a first waveguide conduit connected to the antenna unit;
• a second amplifying and frequency-mixing circuitry configured to down convert an incoming signal (RW) received through a second waveguide conduit connected to the antenna unit;
• and
• a modulator-demodulator unit configured to transform an outgoing baseband signal (BBT) into the outgoing modulated signal (Tx) and transform the incoming signal (RW) into a received baseband signal (BBR),
• wherein each of the first and second waveguide conduits is arranged to forward radio-frequency signals on at least two separate bands (F1H, F1L;
• F2H, F2L),
• wherein the first and second waveguide conduits comprise a respective or a common filter compartment being rotatable a predetermined angle around a rotation axis (AV, AP) relative to a frame so as to either engage a first waveguide filter pair (F1H, F2H) or a second waveguide filter pair (F1L, F2L) in the first and second waveguide conduits, which first waveguide filter pair (F1H, F2H) is adapted for radio communication at a higher band than the second waveguide filter pair (F1L, F2L).