Ka/Ku dual band feedhorn and orthomode transduce (OMT)
First Claim
1. A dual band, higher and lower frequency range transducer with a circular coaxial waveguide feed having a longitudinal axis, a first junction for connection of a lower frequency range outer waveguide of the coaxial waveguide feed to at least two rectangular or ridge waveguides offset from the longitudinal axis of the transducer, a second junction for connection of the at least two rectangular or ridge waveguides to a further lower frequency range waveguide and a third junction for connecting an inner higher frequency range waveguide of the coaxial waveguide feed to a further higher frequency range waveguide, wherein the transducer comprises at least first and second parts joined across a first plane substantially perpendicular to the longitudinal axis and including at least a portion of the further higher frequency range waveguide extending within the first plane of the join.
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Accused Products
Abstract
A dual band, higher and lower frequency range transducer with a circular coaxial waveguide feed is described having a first junction for connection of a lower frequency range outer waveguide of the coaxial waveguide feed to at least two rectangular or ridge waveguides offset from the longitudinal axis of the transducer and a second junction for connection of the at least two rectangular or ridge waveguides to a further waveguide. A third junction is provided for connecting an inner waveguide of the coaxial waveguide feed to a higher frequency range waveguide. The transducer comprises at least first and second parts joined across a first plane substantially perpendicular to the longitudinal axis and including at least a portion of the higher frequency range waveguide extending within the first plane of the join. A seal such as an “O” ring seal may be placed easily in the plane of the join thus preventing moisture ingress. Similarly, a feed horn and input and output ports may be sealingly attached to the first and second parts of the transducer. The first and second junctions are preferably impedance matched turnstile junctions.
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Citations
16 Claims
- 1. A dual band, higher and lower frequency range transducer with a circular coaxial waveguide feed having a longitudinal axis, a first junction for connection of a lower frequency range outer waveguide of the coaxial waveguide feed to at least two rectangular or ridge waveguides offset from the longitudinal axis of the transducer, a second junction for connection of the at least two rectangular or ridge waveguides to a further lower frequency range waveguide and a third junction for connecting an inner higher frequency range waveguide of the coaxial waveguide feed to a further higher frequency range waveguide, wherein the transducer comprises at least first and second parts joined across a first plane substantially perpendicular to the longitudinal axis and including at least a portion of the further higher frequency range waveguide extending within the first plane of the join.
Specification