RF Waveguide Array Ground Electrodes for Crosstalk Reduction
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Solution Overview
Problem
Dual parallel I/Q modulators experience high frequency losses and unwanted crosstalk due to the spread of electrical fields between RF transmission lines, which affects the performance of RF waveguide arrays.
Innovation Solution
Incorporating downwardly extending portions into the ground electrodes of the RF waveguide array, either by filling trenches in the substrate with metal or sputtering metal into the substrate, to limit the spread of electrical fields and reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ground electrodes are placed on the substrate surface without extending into the substrate, then the device complexity is low and manufacturing is easy, but electrical fields spread between adjacent RF transmission lines causing high frequency losses and crosstalk
Solution Approach 1:
The ground electrodes are extended from the two-dimensional substrate surface into the third dimension by forming downwardly extending portions that penetrate into the substrate. This dimensional change creates a three-dimensional electrode structure that effectively contains electrical fields within each transmission line, preventing field spread and crosstalk between adjacent lines, thereby reducing frequency losses without significantly complicating the manufacturing process
Solution Approach 2:
The downwardly extending portions of the ground electrodes act as intermediaries that penetrate through the substrate to provide electrical shielding between adjacent RF transmission lines. These extensions serve as field-containing structures that mediate the interaction between neighboring lines, preventing harmful electromagnetic coupling and reducing crosstalk while maintaining a relatively simple overall device architecture
2Object-generated harmful factors
If ground electrodes are extended into the substrate to limit electrical field spread, then crosstalk between adjacent lines is reduced, but the manufacturing process becomes more complex requiring trench formation and metal filling
Solution Approach 1:
The ground electrodes are extended from the two-dimensional substrate surface into the third dimension by forming downwardly extending portions that penetrate into the substrate. This dimensional change creates a three-dimensional electrode structure that effectively contains electrical fields within each transmission line, preventing field spread and crosstalk between adjacent lines, thereby reducing frequency losses without significantly complicating the manufacturing process
Solution Approach 2:
The downwardly extending portions of the ground electrodes act as intermediaries that penetrate through the substrate to provide electrical shielding between adjacent RF transmission lines. These extensions serve as field-containing structures that mediate the interaction between neighboring lines, preventing harmful electromagnetic coupling and reducing crosstalk while maintaining a relatively simple overall device architecture
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
Significantly improves the cross-talk and S21 curve performance of the RF transmission line array, reducing frequency losses and interference between adjacent lines.
Implementation Method 1
limit the spread of electrical fields and reduce crosstalk
Data Source
AI summary
There is described an RF waveguide array. The array comprises a substrate comprising a plurality of optical waveguides, each waveguide being elongate in a first direction. An electrical RF transmission line array is located on a face of the substrate and comprises a plurality of signal electrodes and a plurality of ground electrodes, each electrode extending in the first direction. Each signal electrode is positioned to provide a signal to two respective waveguides. The ground electrodes include at least one intermediate ground electrode positioned between each pair of signal electrodes. Each intermediate ground electrode includes a portion extending into the substrate.