Antenna-Size Sampling Frequency for Reverberation Chamber Testing
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Solution Overview
Problem
Existing methods for measuring transmission characteristics in radiated emission tests using a reverberation chamber are laborious and time-consuming due to the need for multiple measurements to average out fluctuations in electric field strength.
Innovation Solution
A program and information processing device that calculate a frequency interval based on the size of the transmitting and receiving antennas within the reverberation chamber, using a predetermined percentage of 30% or less to determine sampling frequencies for accurate estimation of transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple measurements are performed while rotating or moving antennas to average out electric field fluctuations, then measurement accuracy is improved, but measurement time and labor increase significantly
Solution Approach 1:
The patent changes the parameter of measurement sampling by determining an optimal sampling frequency based on antenna size. Instead of performing multiple measurements at different positions, the system performs multiple measurements at the same position with a sampling frequency of fs ≤ c/(8L), where c is the speed of light and L is the antenna length. This parameter change allows accurate transmission characteristic estimation without the need to rotate or move antennas, thereby reducing measurement time while maintaining accuracy.
2Measurement precision
If multiple measurements are performed while rotating or moving antennas to average out electric field fluctuations, then measurement accuracy is improved, but operational complexity increases
Solution Approach 1:
The patent simplifies the measurement operation by changing the sampling frequency parameter. The measurement device performs multiple measurements at a fixed position with a sampling frequency determined by the antenna size (fs ≤ c/(8L)), eliminating the need for complex operations of rotating or moving antennas to different positions. This parameter-based approach maintains measurement accuracy while significantly improving operational simplicity.
3Measurement precision
If sampling frequency is increased to capture transmission characteristic variations, then measurement accuracy is improved, but data processing load increases
Solution Approach 1:
The patent optimizes the sampling frequency parameter to balance measurement accuracy and data volume. By setting the sampling frequency to fs ≤ c/(8L) where L is the antenna length, the system captures sufficient frequency spectrum information for accurate transmission characteristic estimation without generating excessive data. This parameter optimization ensures that the sampling frequency is high enough to capture variations but low enough to keep data processing manageable.
Data Source
AI summary
A program causes a computer to execute a decision step of deciding a larger antenna size between antenna sizes of a transmitting antenna provided within a reverberation chamber in which a test object is arranged and a receiving antenna installed within the reverberation chamber as a target antenna size and a first calculation step of calculating a product of a value obtained by dividing a speed of light by the target antenna size decided in the decision step and a predetermined percentage of 30% or less as an interval between sampling frequencies for detecting a first frequency spectrum that is a frequency spectrum of a first transmission characteristic that is a transmission characteristic between the transmitting antenna and the receiving antenna.