Virtual Vector Network Analyzer Measurement Module for Confined Spaces
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Solution Overview
Problem
Current vector network analyzers are limited by their size and the need for RF test cables, which hinder direct measurement on device-under-test connectors and introduce calibration errors due to confined locations and cable variations.
Innovation Solution
A hand-held virtual vector network analyzer measurement module that separates the user interface from the high-frequency components, using a computer interface for power and communication, allowing direct connection to the device-under-test without test cables and maintaining calibration accuracy through digitized signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a desktop or portable VNA is used with RF test cables, then the VNA can perform measurements, but the large size and cable requirements make it difficult to measure directly on DUT connectors in confined locations
Solution Approach 1:
The VNA is divided into two separate components: a compact measurement module containing only the essential RF measurement circuitry, and a separate user interface (computer). This segmentation allows the measurement module to be small enough to connect directly to DUT connectors while the bulk of the device remains external.
Solution Approach 2:
The user interface components (display, keyboard, processing) are extracted from the measurement module and placed in a separate computer system. This extraction reduces the measurement module to its essential function of signal generation and measurement, enabling direct connection to DUTs without bulky cables or interfaces.
2Measurement precision
If precision test cables are used to connect VNA to DUT, then measurement accuracy can be maintained, but calibration errors are introduced when DUTs are in confined locations where cables cannot be positioned correctly
Solution Approach 1:
A small connector serves as an intermediary between the measurement module and the DUT. This connector is small enough to reach confined locations and allows calibration to be performed directly at the measurement point, eliminating cable-related calibration errors while maintaining measurement precision.
3Device complexity
If the VNA includes built-in user interface components, then the device is self-contained, but the device size increases making it impossible to perform direct measurements on DUT connectors
Solution Approach 1:
The VNA system is segmented into a compact measurement module and a separate user interface. The measurement module contains only the essential RF measurement components, making it small enough for direct connection to DUT connectors, while the user interface resides in the external computer system.
Data Source
AI summary
A hand-carriable, single port measurement module of a virtual vector network analyzer is sized and configured so as to be directly connectable to devices typically located within confined spaces normally requiring the use of an intervening test cable and which may be closely spaced to other devices that may need to be tested by other measurement modules. The measurement module includes a single test port extending from a housing wherein the housing is elongated along the axis of insertion of the test port and has a length substantially less than 12 inches. A circuit disposed within the housing is configured to transmit and receive test signals through the test port for measurement of a device under test and to transmit digitized signals representing the test signals through a communication interface of the module to a user interface separate from the housing for presentation to a user.