Shared Through-Line Directional Coupler for Low-Loss VNA Reflectometry
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Solution Overview
Problem
Existing directional couplers in measurement systems, particularly in vector network analyzers (VNAs), suffer from large size and significant signal loss, which reduces output power and dynamic range, especially at high frequencies.
Innovation Solution
Implementing a dual directional coupler configuration where two couplers share a common section of the signal line, reducing the overall length and signal loss by half, allowing for improved power monitoring and increased dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional directional couplers are used in measurement systems, then signal coupling and measurement functions are achieved, but the device size becomes large and signal loss increases
Solution Approach 1:
The patent combines two directional couplers into a single integrated structure where they share a common through-line section. This merging reduces the overall device length and minimizes signal loss by eliminating redundant transmission line sections while maintaining the dual-directional coupling functionality.
Solution Approach 2:
The patent transitions from a linear sequential arrangement of couplers to a parallel configuration where both couplers operate simultaneously on the same through-line. This dimensional reorganization reduces the total length required and decreases cumulative signal loss.
2Power
If traditional directional couplers are used in measurement systems, then signal coupling and measurement functions are achieved, but the output power and dynamic range are reduced
Solution Approach 1:
By merging two directional couplers into a shared configuration, the patent reduces cumulative signal loss in the through-line, thereby preserving more output power. The shared through-line eliminates redundant transmission sections that would otherwise attenuate the signal further.
3Adaptability or versatility
If two directional couplers are implemented separately, then dual-directional measurement capability is achieved, but the device complexity and size increase
Solution Approach 1:
The patent merges two directional couplers into a single integrated device that maintains dual-directional measurement capability. The shared through-line configuration allows both couplers to operate simultaneously in opposite directions without requiring separate independent structures, thereby reducing overall complexity.
4Adaptability or versatility
If two directional couplers are implemented separately, then dual-directional measurement capability is achieved, but the overall device length increases
Solution Approach 1:
The patent reorganizes the coupler configuration from a linear sequential arrangement to a parallel structure where both couplers share the same through-line space. This dimensional change enables dual-directional measurement capability within a compact length by utilizing the same physical space for both measurement functions.
Data Source
AI summary
A reflectometer may include two directional couplers configured in parallel by being disposed across from each other on opposite sides of a shared section of a signal line. One of the couplers may couple, to a first port of the reflectometer, a portion of the signal power of a first signal flowing from the first end of the shared through-line to the second end of the shared through-line, and the other coupler may couple, to a second port of the reflectometer, a portion of the signal power of a second signal flowing from the second end of the shared through-line to the first end of the shared through-line. The reflectometer benefits from reduced size and signal loss relative to a serial coupler configuration. When used in vector network analyzer (VNA) systems, this results in higher output power and higher dynamic range of the VNA.