Arcuate-Edge Electromagnetic Coupler for Directivity and Power Handling
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Solution Overview
Problem
Directional electromagnetic couplers face challenges with limited power handling capabilities and poor directivity due to uneven odd and even mode velocities, especially at higher frequencies, where conventional designs with wiggly edges provide some improvement but are not sufficient.
Innovation Solution
The electromagnetic coupler features a substrate with conductors having smooth, wiggly inner edges defined by multiple arcuate formations, which are complementary and follow curved paths to equalize even and odd-mode velocities, enhancing directivity and power handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wiggly edge designs are used to equalize odd and even mode velocities, then directivity is improved, but power handling capability remains limited
Solution Approach 1:
The patent applies curved arcuate formations to the inner edges of the coupled conductors instead of conventional rectangular, triangular, or sawtooth profiles. These smooth curved edges equalize the odd and even mode phase velocities while providing rounded transitions that improve power handling capability by reducing electromagnetic field concentration at sharp corners.
2Adaptability or versatility
If multiple sections are used to expand bandwidth, then bandwidth and flatness are improved, but discontinuities between sections degrade performance at higher frequencies
Solution Approach 1:
The patent implements non-uniform line dimensions with smooth transitions between sections, where the inner edges are profiled with varying arcuate formations along the length of the coupler. This creates locally optimized impedance transformations that maintain broadband performance while eliminating abrupt discontinuities that degrade high-frequency operation.
3Reliability
If the odd mode velocity is slowed to equalize with even mode velocity, then directivity is improved, but the structure becomes more complex
Solution Approach 1:
The patent introduces asymmetry in the inner edge profiling of the coupled conductors, where one conductor has arcuate formations that specifically slow the odd mode velocity. This asymmetric modification to the conductor geometry creates the necessary velocity equalization while maintaining a relatively simple overall structure that can be fabricated using standard PCB techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively equalizes odd and even-mode velocities, improving directivity and increasing the coupler's power handling capacity, allowing for thinner conductive strips and reduced manufacturing complexity while maintaining coupling performance across a wide frequency range.
Implementation Method 1
a smooth wiggly inner edge for substantially equalising even and odd-mode velocities of the electromagnetic signal
Implementation Method 2
a pair of spaced apart electromagnetically coupled conductors mounted on the substrate
Data Source
AI summary
An electromagnetic coupler including: a substrate; and a first conductor mounted to the substrate for receiving a first electromagnetic signal, the first conductor having a first multiple arcuate edge; a second conductor mounted to the substrate, the second conductor being spaced apart from the first conductor and having a second multiple arcuate edge that is opposed to the first edge for generating in the second conductor a second electromagnetic signal that is derived from the first electromagnetic signal.