3D Microwave Directional Coupler Multi-Plane Energy Transfer
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Solution Overview
Problem
Conventional directional couplers face manufacturing challenges and performance limitations, particularly in achieving a preselected degree of coupling of 3 dB or less, which requires closely positioned transmission lines, leading to yield problems and increased costs.
Innovation Solution
A directional coupler with a three-dimensional structure that allows coupling on multiple planes, featuring transmission line segments on two planes connected by conductive segments, enabling energy transfer between them, and adjustable gap spacings to achieve desired coupling levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If transmission lines are positioned very close together to achieve a preselected degree of coupling of 3 dB or less, then coupling performance is improved, but manufacturing and fabrication yield problems occur
Solution Approach 1:
The patent transitions from conventional two-dimensional planar coupling to three-dimensional coupling by positioning transmission line segments on multiple planes (first plane and second plane spaced apart). This dimensional change allows achieving precise coupling levels without requiring extremely close spacing on a single plane, thereby improving manufacturing feasibility while maintaining coupling precision.
2Manufacturing precision
If transmission lines are positioned very close together to achieve a preselected degree of coupling of 3 dB or less, then coupling performance is improved, but costs increase
Solution Approach 1:
By utilizing three-dimensional space with transmission line segments on multiple planes connected by conductive segments, the patent achieves precise coupling levels without the need for extremely tight tolerances and expensive fabrication processes required by conventional close-spaced planar designs, thereby reducing manufacturing costs while maintaining coupling precision.
3Ease of manufacture
If conventional interdigitated coupling segments are used on a flat surface, then manufacturing is simplified, but performance is limited
Solution Approach 1:
The patent extends the conventional two-dimensional interdigitated structure into three dimensions by adding transmission line segments on a second plane spaced apart from the first plane, connected by conductive segments. This maintains manufacturing simplicity through standardized multi-layer construction while significantly improving coupling performance by enabling energy coupling across multiple planes.
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 enhances coupling performance beyond conventional couplers, achieving greater than 3 dB coupling with improved manufacturing feasibility and reduced costs by allowing energy transfer on multiple planes and optimizing gap spacings for efficient energy distribution.
Implementation Method 1
the first and second transmission line segments are configured to couple energy therebetween, and where the third and fourth transmission line segments are configured to couple energy therebetween
Implementation Method 2
two transmission lines set close enough together such that energy passing through one line is coupled to the other line
Data Source
AI summary
Directional couplers are provided. In one embodiment, the directional coupler includes first and second transmission line segments positioned on a first plane and spaced apart by a first distance, third and fourth transmission line segments positioned on a second plane and spaced apart by a second distance, the second plane spaced apart from the first plane, a first conductive segment connecting the first and third transmission line segments, and a second conductive segment connecting the second and fourth transmission line segments, where the first and second transmission line segments are configured to couple energy therebetween, and where the third and fourth transmission line segments are configured to couple energy therebetween.