Waveguide Combiner Transition Cavity Design
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Solution Overview
Problem
Existing radial waveguide power combiners face limitations in peak and average power handling due to cross-sectional dimension constraints of coaxial transmission lines, leading to undesirable reflections and reduced amplitude and phase balance, and manufacturing limitations result in abrupt discontinuities causing further issues.
Innovation Solution
A combiner/divider design featuring a transition cavity that extends along the inner ports of input/output waveguides, with a three-dimensional transition waveguide coupling these to an output waveguide, allowing for a progressive narrowing of the transition waveguide and tapered input/output waveguides to reduce reflections and enhance power handling capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cross-sectional dimensions of the coaxial transmission line are reduced to maintain TEM mode operation, then amplitude and phase balance is improved, but power handling capability deteriorates
Solution Approach 1:
The patent transitions from coaxial transmission line parameters to waveguide parameters, fundamentally changing the transmission mode from TEM to waveguide modes. This allows the structure to support higher power levels while maintaining amplitude and phase balance through precise waveguide dimension design and mode control.
Solution Approach 2:
The patent replaces the coaxial transmission line mechanical structure with a waveguide structure. This substitution eliminates the cross-sectional dimension constraint that limited power handling in coaxial lines, while the waveguide geometry provides the necessary control for maintaining amplitude and phase balance.
2Ease of manufacture
If the input waveguide walls are truncated to simplify manufacturing, then ease of manufacture is improved, but reflection losses increase
Solution Approach 1:
The patent incorporates tapered sections at the waveguide junctions before the final truncation point. This preliminary tapering action gradually transitions the impedance, reducing reflections that would otherwise occur at abrupt discontinuities, while still allowing the walls to be truncated for manufacturing simplicity.
Solution Approach 2:
The patent uses tapered transitions with curved surfaces instead of abrupt angular truncations. The curved geometry provides a gradual impedance transition that minimizes reflections, while the overall structure remains manufacturable by controlling the taper profile.
3Power
If radial waveguide combiners are used to combine high-power signals, then power combining capability is improved, but cross-sectional dimension constraints limit the achievable power levels
Solution Approach 1:
The patent extends the waveguide structure in the longitudinal dimension rather than being constrained by cross-sectional dimensions. By using longitudinal tapering and extended transition sections, the design achieves high power handling capability without being limited by the cross-sectional area constraints of conventional radial combiners.
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 achieves efficient combining or dividing of high-power signals with reduced loss and increased power handling capacity, approaching the sum of input waveguides' power levels, while minimizing reflections and maintaining amplitude and phase balance.
Implementation Method 1
The input signals are then combined in the center of the radial waveguide by a transition from radial waveguide to a transverse electro-magnetic (TEM) mode coaxial transmission line
Implementation Method 2
Abrupt discontinuities necessarily occur at the truncated input waveguide wall tips that may cause undesirable reflections of the internal guided waves
Data Source
AI summary
A combiner/divider includes a plurality of input/output waveguides distributed in a plane and diverging in at least a partially common direction away from a central point. Each input/output waveguide extends from an outer node disposed distal of the central point to an inner port proximate to and spaced from the central point. Each input/output waveguide has a respective dimension in the plane that increases between the inner port and the outer node. An output/input waveguide has an aggregate port proximate to the central point and facing the inner ports. A transition waveguide defines an open cavity that flares outwardly in the plane from the aggregate port toward the inner ports and communicatively couples the output/input waveguide with the input/output waveguides. Opposing distal surfaces of the transition waveguide and inner port edges are spaced apart by a distance that decreases with increasing distance from the aggregate port.