Waveguide Spatial Power Combiner Amplitude Balance
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Solution Overview
Problem
Existing rectangular waveguide spatial power combiner configurations suffer from imbalance in signal amplitude, where central slotline modules receive more power than edge modules, leading to reduced power-combining efficiency due to sinusoidal field intensity distribution.
Innovation Solution
A power combiner apparatus with varying characteristics of slotline modules, including position-dependent slotline antennas and dielectric substrate thickness, to achieve signal amplitude balance matching a specified contour, along with slotline-to-microstrip transitions and delay equalization structures to enhance power combining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional rectangular waveguide spatial power combiner configuration is used, then the structure is simple and easy to manufacture, but the signal amplitude is unbalanced with central modules receiving more power than edge modules, reducing power-combining efficiency
Solution Approach 1:
The patent applies local quality by varying the characteristics of slotline modules based on their positions in the array. Central modules have different characteristics (e.g., different dielectric substrate thicknesses or antenna configurations) compared to edge modules, allowing each module to be optimized for its local field conditions. This compensates for the sinusoidal field distribution in rectangular waveguides, balancing the signal amplitude across all modules and improving power-combining efficiency without significantly increasing manufacturing complexity
Solution Approach 2:
The patent changes physical parameters of the slotline modules, such as dielectric substrate thickness, conductor dimensions, or antenna geometry, depending on the module's position in the array. By adjusting these parameters, the coupling efficiency and signal amplitude are optimized for each local position, transforming the uniform structure into a position-dependent optimized structure that achieves better power combining while maintaining reasonable manufacturing simplicity
2Device complexity
If slotline modules are uniformly configured throughout the waveguide array, then the device complexity is low, but the signal amplitude distribution is unbalanced, leading to reduced overall performance
Solution Approach 1:
The patent implements local quality by making different slotline modules have different characteristics based on their positions. Central modules, which experience higher field intensity, are configured with parameters that reduce their coupling efficiency (e.g., thicker dielectric substrates or smaller antenna apertures), while edge modules, experiencing lower field intensity, are configured with parameters that enhance their coupling (e.g., thinner substrates or larger apertures). This position-dependent configuration balances the signal amplitude across the array, improving reliability without requiring complex control systems
Solution Approach 2:
The patent introduces asymmetry by deliberately making the slotline module characteristics non-uniform across the array. Instead of symmetric uniform configuration, the design employs asymmetric parameter distribution where modules at different positions have deliberately different properties. This asymmetric configuration counteracts the inherent asymmetric field distribution in rectangular waveguides, achieving balanced signal amplitude and improved performance
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 achieves balanced signal amplitude distribution among slotline modules, increasing the performance of spatially-combined arrays by optimizing power handling and reducing spectral regrowth, thereby improving overall power-combining efficiency and stability.
Implementation Method 1
Structures transform the microwave energy from the slotline mode to a microstrip mode
Implementation Method 2
a waveguide enclosure defined on an input side by an input waveguide section supporting an input field, and on an output side by an output waveguide section supporting an output field
Data Source
AI summary
A power combining array and method of increasing performance in a power combining array includes a waveguide enclosure having a plurality of slotline modules disposed therein. The slotline modules include input and output antennas that have varying physical characteristics to overcome differences in field intensity across the slotline module configuration and to account for phase changes. The varying physical characteristics include differences in longitudinal position, thickness, dielectric constant, and circuit element configurations. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.