Coupler with waveguide transition for an antenna in a radar-based level measurement system
First Claim
1. A coupler mechanism for coupling a coaxial waveguide with a circular waveguide having a TE11 waveguide mode of operation, said coupler mechanism comprising:
- a coaxial waveguide port for receiving said coaxial waveguide, said coaxial waveguide having a coaxial waveguide impedance;
a port for coupling said circular waveguide, said circular waveguide having a circular waveguide impedance;
an impedance transformer;
a matching waveguide; and
a body member, said body member having a stepped section, said stepped section receiving said impedance transformer;
said matching waveguide being coupled to said coaxial waveguide port, said matching waveguide having an impedance matching the impedance of said coaxial waveguide and said matching waveguide further comprising a rounded rectangular waveguide having a quasi-TE10 waveguide mode of operation;
said impedance transformer having a first port for receiving said matching waveguide, a second port for said circular waveguide and a transition section, said transition section having one or more waveguide transitions and serving to match the impedance of said circular waveguide with the impedance of said matching waveguide; and
said stepped section in said body member having one or more steps corresponding to said waveguide transitions.
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Accused Products
Abstract
A mechanism for coupling a coaxial waveguide to another waveguide. The mechanism includes a lower or matching waveguide and an impedance transformer. A coaxial port couples the coaxial waveguide to the matching waveguide. The matching waveguide has a waveguide impedance which is close to the impedance of the coaxial waveguide. This arrangement allows matching between the coaxial waveguide and the matching waveguide over a wider frequency band. The impedance transformer couples the matching waveguide to the other waveguide. The impedance transformer comprises a single-stage, double-stage, or multi-stage transformer. The mechanism is suitable for coupling an antenna to a coaxial cable interface in a radar or microwave based level measurement or time of flight ranging systems.
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Citations
16 Claims
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1. A coupler mechanism for coupling a coaxial waveguide with a circular waveguide having a TE11 waveguide mode of operation, said coupler mechanism comprising:
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a coaxial waveguide port for receiving said coaxial waveguide, said coaxial waveguide having a coaxial waveguide impedance; a port for coupling said circular waveguide, said circular waveguide having a circular waveguide impedance; an impedance transformer; a matching waveguide; and a body member, said body member having a stepped section, said stepped section receiving said impedance transformer; said matching waveguide being coupled to said coaxial waveguide port, said matching waveguide having an impedance matching the impedance of said coaxial waveguide and said matching waveguide further comprising a rounded rectangular waveguide having a quasi-TE10 waveguide mode of operation; said impedance transformer having a first port for receiving said matching waveguide, a second port for said circular waveguide and a transition section, said transition section having one or more waveguide transitions and serving to match the impedance of said circular waveguide with the impedance of said matching waveguide; and said stepped section in said body member having one or more steps corresponding to said waveguide transitions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for coupling a coaxial waveguide with a circular waveguide having a TE11 waveguide mode of operation, said apparatus comprising:
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a coaxial waveguide port for receiving said coaxial waveguide, said coaxial waveguide having a coaxial waveguide impedance, and said circular waveguide having an associated impedance; an impedance transformer; a matching waveguide; said matching waveguide being coupled to said coaxial waveguide port, said matching waveguide having an impedance matching the impedance of said coaxial waveguide and said matching waveguide further comprising a rectangular waveguide having a TE10 waveguide mode of operation; said impedance transformer having a first port for receiving said matching waveguide, a port for coupling to said circular waveguide and a transition section, said transition section having one or more waveguide transitions, said transition section serving to match the associated impedance of said circular waveguide with the impedance of said matching waveguide; a stepped section, said stepped section receiving said impedance transformer, and said stepped section having one or more steps corresponding to said waveguide transitions. - View Dependent Claims (12, 13, 14, 15)
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16. Apparatus for coupling a coaxial waveguide with a circular waveguide having a TE11 waveguide mode of operation, said apparatus comprising:
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a coaxial waveguide port for receiving said coaxial waveguide, said coaxial waveguide having a coaxial waveguide impedance, and said circular waveguide having an associated impedance; an impedance transformer; a matching waveguide; said matching waveguide being coupled to said coaxial waveguide port, and said matching waveguide having an impedance matching the impedance of said coaxial waveguide and said matching waveguide further comprising a rounded rectangular waveguide having a TE10 waveguide mode of operation; said impedance transformer having a first port for receiving said matching waveguide, a port for coupling to said circular waveguide and a transition section, said transition section having one or more waveguide transitions, said transition section serving to match the associated impedance of said circular waveguide with the impedance of said matching waveguide; a stepped section, said stepped section receiving said impedance transformer, and said stepped section having one or more steps corresponding to said waveguide transitions.
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Specification