L-Shaped Waveguide Transducer for Miniaturization
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Solution Overview
Problem
Existing coaxial waveguide transducers face challenges in achieving miniaturization while maintaining satisfactory reflection characteristics, as increasing the distance between the coaxial line and the short-circuiting plane reduces size but compromises reflection performance.
Innovation Solution
A coaxial waveguide transducer with a substantially L-shaped waveguide configuration, featuring a stepwise step bend part and conductors arranged to match the central conductor's direction, allowing for miniaturization while maintaining reflection characteristics through adjustable gap lengths between conductive plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the coaxial line and the short-circuiting plane is made large, then reflection characteristics are satisfied, but the size of the coaxial waveguide transducer increases
Solution Approach 1:
The patent introduces an L-shaped waveguide configuration that changes the spatial arrangement from a linear distance-based structure to a multi-dimensional folded structure. The waveguide bends at approximately 90 degrees, allowing the coaxial line and short-circuiting plane to be positioned in different spatial dimensions while maintaining an effective electrical distance for satisfactory reflection characteristics, thereby reducing the overall footprint of the transducer.
Solution Approach 2:
The L-shaped waveguide structure effectively nests the signal path within a compact volume by folding the waveguide back on itself. This creates a nested configuration where the waveguide occupies a smaller external envelope while maintaining the required internal path length for proper impedance matching and reflection characteristics.
2Reliability
If the distance between the coaxial line and the short-circuiting plane is made large, then reflection loss is improved, but the transducer cannot be miniaturized
Solution Approach 1:
By transitioning from a linear arrangement to an L-shaped folded arrangement, the patent achieves the required effective length for reflection loss performance while reducing the linear dimension (length) of the transducer. The waveguide extends in one direction and then bends to extend in a perpendicular direction, achieving path length without increasing the maximum linear extent.
Solution Approach 2:
The L-shaped waveguide introduces asymmetry in the spatial configuration, with the bend positioned at a specific location that optimizes the balance between compactness and electrical performance. This asymmetric folding allows the structure to achieve its functional length in a non-linear fashion, reducing the overall transducer length.
Data Source
AI summary
A coaxial waveguide transducer includes: a waveguide having a substantially L shape formed of a first waveguide part and a second waveguide part arranged substantially orthogonal to each other; a stepwise step bend part formed in an outer corner part of an L-shaped bent part of the waveguide; a first conductor and a second conductor arranged in respective inner side walls of the waveguide in such a way that they are extended in a direction in which a central conductor of the coaxial line is extended and are positioned on a plane the same as that where the central conductor is provided; and a third conductor having one end connected to the central conductor and another end connected to one of the first conductor and the second conductor, the third conductor being arranged obliquely with respect to the direction in which the central conductor is extended.