Vector Network Analyzer Summing Line Architecture
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Solution Overview
Problem
Traditional vector network analyzers (VNAs) are bulky, expensive, and unreliable due to their complex architecture, which includes multiple mechanical switches and directional couplers, requiring multiple receivers for each port, making them costly and difficult to maintain.
Innovation Solution
A compact VNA design that uses a reduced number of receivers and directional couplers, with a summing line configuration to combine signals, eliminating the need for dedicated receivers at each port and incorporating directional couplers with cascaded transmission lines for efficient signal sampling, and utilizing hole couplers for directional coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional VNA architecture with multiple receivers and directional couplers is used for each port, then measurement accuracy is maintained, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple receiver functions into a single shared receiver by using a summing line that aggregates signals from multiple directional couplers. Instead of having dedicated receivers for each port, the system merges signal paths so that one receiver can process combined signals from multiple sources through the summing line, thereby reducing the total number of receivers while maintaining measurement capability
Solution Approach 2:
The single receiver is designed to universally handle signals from multiple ports through the summing line configuration. The receiver performs multiple functions by processing combined signals that represent measurements from different ports, making it a multi-functional component that replaces what would traditionally require multiple dedicated receivers
2Ease of operation
If mechanical switches are used for signal routing in VNA, then signal direction control is achieved, but reliability decreases due to frequent switching
Solution Approach 1:
The patent replaces mechanical switches with an electrical signal routing system based on directional couplers and a summing line. Instead of using mechanical components to route signals between ports, the system uses electromagnetic signal coupling and constructive interference principles to achieve signal direction control electronically, eliminating the reliability issues associated with mechanical switching
3Measurement precision
If multiple directional couplers are used for signal sampling at each port, then measurement completeness is improved, but device size and cost increase
Solution Approach 1:
The patent merges multiple signal sampling paths into a single physical location by using a summing line that combines signals from multiple directional couplers. The coupled ports of the directional couplers are connected to the summing line, which aggregates the sampled signals so they can be processed by a single receiver, thereby reducing the device footprint while maintaining complete signal sampling capability
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 results in a more affordable, portable, and reliable VNA with reduced complexity, requiring only two receivers for four ports, enhancing reliability and simplifying calibration while maintaining accurate signal measurement capabilities.
Implementation Method 1
a plurality of couplers for coupling a plurality of coupled signals, wherein said plurality of coupled signals are combined to provide a sum signal
Data Source
AI summary
A vector network analyzer (VNA) for analyzing the response of a device under test (DUT), the VNA comprising a plurality of VNA ports configured to be connected to the DUT; a plurality of source ports configured to be connected to the VNA ports; a plurality of couplers for coupling a plurality of coupled signals, wherein said plurality of coupled signals are combined to provide a sum signal; and a receiver configured to receive said forward sum signal.