Waveguide Bend Gap Enlargement for Impedance Matching
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Solution Overview
Problem
Waveguide devices with bends experience impedance mismatching, leading to unwanted reflection and propagation loss of electromagnetic waves, which results in signal noise and reduced transmission efficiency.
Innovation Solution
A waveguide device with an enhanced impedance matching at bends by enlarging the gap between the conductive surface and the waveguide face, incorporating an artificial magnetic conductor with a recess or chamfered structure to introduce inductance components that cancel out capacitance components, ensuring improved impedance matching across a broad frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a waveguide member has a bend, then the waveguide can change direction, but impedance mismatching occurs causing signal reflection and propagation loss
Solution Approach 1:
The patent applies local quality by modifying only the specific region where the bend occurs. A recess is formed at the bend portion of the waveguide member, creating a localized gap enlargement only where needed, while the rest of the waveguide maintains its original structure. This localized modification introduces inductance components precisely at the bend to cancel capacitance components and improve impedance matching, resolving the contradiction between directional flexibility and propagation loss.
Solution Approach 2:
The patent changes the geometric parameter of the waveguide by forming a recess that enlarges the gap between the waveguide face and the opposing conductive surface at the bend portion. This parameter change (increased gap size) modifies the electromagnetic field distribution and introduces inductance, which compensates for the capacitance effect at the bend and improves impedance matching, thereby reducing propagation loss while maintaining directional flexibility.
2Reliability
If the gap between conductive surface and waveguide face is enlarged at bend, then impedance matching is improved, but the overall waveguide size increases
Solution Approach 1:
The recess is formed only at the bend portion of the waveguide member, not throughout the entire waveguide structure. This localized gap enlargement improves impedance matching specifically where needed (at the bend) while minimizing the overall volume increase. The rest of the waveguide maintains its compact original dimensions, thus resolving the contradiction between reliability through improved impedance matching and minimal waveguide volume.
3Reliability
If a recess structure is added to the waveguide member, then inductance components are introduced to cancel capacitance, but device complexity increases
Solution Approach 1:
The recess structure is implemented only at the bend portion of the waveguide member, creating a localized modification rather than a complex overall structure. This simple geometric change (forming a recess) is sufficient to introduce the necessary inductance components locally, canceling capacitance effects without requiring complex additional components or structures throughout the entire waveguide, thus improving reliability while minimizing device complexity.
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
The solution effectively suppresses signal wave reflection, reduces power loss, and improves phase disorder, leading to enhanced propagation efficiency and communication signal quality, as well as improved radar precision in distance and direction-of-arrival estimation.
Implementation Method 1
A waveguide device with an enhanced impedance matching at bends by enlarging the gap between the conductive surface and the waveguide face, incorporating an artificial magnetic conductor with a recess or chamfered structure to introduce inductance components that cancel out capacitance components
Implementation Method 2
incorporating an artificial magnetic conductor with a recess or chamfered structure to introduce inductance components
Implementation Method 3
an electromagnetic wave of a wavelength which is contained in the propagation-restricted band of the artificial magnetic conductor propagates along the ridge
Data Source
AI summary
A waveguide device includes: an electrically conductive member having an electrically conductive surface; a waveguide member having an electrically-conductive waveguide face of a stripe shape opposing the electrically conductive surface, the waveguide member extending along the electrically conductive surface; and an artificial magnetic conductor extending on both sides of the waveguide member. The waveguide member has a bend at which the direction that the waveguide member extends changes. A waveguide which is defined by the electrically conductive surface, the waveguide face, and the artificial magnetic conductor includes a gap enlargement where a gap between the electrically conductive surface and the waveguide face is locally increased. In a perspective view along a direction perpendicular to the electrically conductive surface, at least a portion of the bend has an overlap with the gap enlargement.