Importance

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Abstract

An apparatus comprising:

a first waveguide port configured to support first signals having a first polarisation state;a second waveguide port configured to support second signals having a second polarisation state orthogonal to the first polarisation state;a third waveguide port configured to support combined signals comprising a first signal component having the first polarisation state and a second signal component having the second polarisation state;a waveguide structure, disposed between the first waveguide port, the second waveguide port and the third waveguide port, configured to:split a combined signal received via the third waveguide port into first and second signal components and to provide the first signal component to the first waveguide port and the second signal component to the second waveguide port,and/orcombine a first signal received via the first waveguide port and a second signal received via the second waveguide port into a combined signal and to provide the combined signal to the third waveguide port;wherein an end portion of the first waveguide port, adjacent the waveguide structure, comprises, at a first side, a first curved portion having a first radius of curvature, r1, and, at a second side, a second curved portion having a second, different radius of curvature, r2.

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First Claim