VNA Receiver Bandwidth Extension via Segmented Reflectometers
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Solution Overview
Problem
Existing vector network analyzers (VNAs) have limited bandwidth due to the restricted wave-separation capabilities of directional couplers, which limits their ability to effectively measure frequency responses across wide frequency ranges.
Innovation Solution
The implementation of one or more integrated and/or remote reflectometer receivers along the RF source path, activated by switches that connect the main strobe source and IF channels to appropriate ports when the frequency range coincides with the sweeping RF source, expanding the operating bandwidth of the VNA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If directional couplers are used for wave separation in VNA, then signal separation capability is improved, but bandwidth is limited
Solution Approach 1:
The system divides the frequency range into multiple segments, each handled by a dedicated reflectometer receiver tuned to a specific frequency range. This segmentation allows each receiver to optimize wave separation for its designated band while collectively covering a much wider bandwidth than a single coupler could provide.
Solution Approach 2:
The VNA system is designed with multiple reflectometer receivers that can be selectively activated based on the frequency range being measured. This multi-functionality allows the same basic receiver architecture to serve multiple frequency bands, extending the overall bandwidth capability while maintaining measurement precision through appropriate receiver selection.
2Adaptability or versatility
If multiple reflectometer receivers are added to extend bandwidth, then usable bandwidth is improved, but device complexity increases
Solution Approach 1:
The system employs dynamic switching between multiple reflectometer receivers based on the frequency range being measured. Only the necessary receiver for the current frequency band is activated, while others remain inactive. This dynamic operation extends the usable bandwidth without requiring all receivers to operate simultaneously, thereby managing system complexity effectively.
3Measurement precision
If additional reflectometer receivers are activated, then measurement sensitivity is improved, but power consumption increases
Solution Approach 1:
Instead of activating all reflectometer receivers simultaneously, the system activates only the specific receiver needed for the current measurement frequency range. This partial action approach maintains measurement sensitivity by using the appropriate specialized receiver while avoiding the excessive power consumption that would result from running all receivers at once.
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 approach allows for a substantial extension of the usable bandwidth of VNAs, enabling them to cover the entire targeted frequency range by activating additional reflectometer receivers as needed, thereby improving measurement sensitivity and dynamic range.
Implementation Method 1
A reflectometer receiver uses a local oscillator (LO) to mix a radio frequency (RF) signal or stimulus from an RF source down to a lower intermediate frequency (IF) signal
Data Source
AI summary
A system for measuring a frequency response of an electrical network includes a signal source, a signal source path, a reflectometer receiver interactively associated with the signal source path by a directional coupler, and one or more additional reflectometer receivers arranged in series along the signal source path and associated with the signal source path by one or more respective additional directional couplers. The directional coupler and one or more respective additional directional couplers operate at different frequency ranges.