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Abstract of GB2103021
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diplexing orthogonal mode transducer for isolating the signals which
are transmitted and received in the two different frequency bands of a
satellite communications system comprises a smooth walled inner
waveguide (1) which is partly overlapped by a coaxial outer waveguide
(2) having an internally corrugated section (2b) adjacent the aperture
(4) of the inner waveguide arranged so that signals in the higher
frequency band are confined to a central region coupled with the inner
waveguide (1) and signals in the lower frequency band are confined to a
peripheral region which couples with the section (2c) of the outer
waveguide surrounding the inner waveguide (1). The annular section (2c)
of the outer waveguide splits into four evenly arranged branches (5)
which peel away from the inner waveguide (1) and transform smoothly
into rectangular waveguides (6), the orthogonal polarisation components
of received low frequency energy being isolated and conducted away by
the branching waveguides (5, 6). The internal corrugations are
dimensioned to present a capacitive reactance to the higher frequency
signal and an inductive reactance to the lower frequency signal. Each
branch (5) is provided with a central rib (7) along its inner wall, the
ribs (7) commencing on the outside of the inner waveguide (1) before
the outer waveguide branches. |
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Data supplied from the esp@cenet database - Worldwide
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