Spurious Emission Measurement via EIRP-Based Filter Selection
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Solution Overview
Problem
Existing spurious emission measurement methods are time-consuming due to the need to set and apply filters at multiple measurement points in a three-dimensional measurement grid, particularly for total radiated power metrics.
Innovation Solution
A method to categorize measurement points based on equivalent isotropic radiated power values, dividing them into subsets where filters are necessary and not necessary, allowing selective application of filters only at points with high power emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filters are applied at all measurement points to filter out the wanted signal, then measurement precision is improved, but measurement time increases significantly
Solution Approach 1:
The patent applies filters selectively only at measurement points where the wanted signal power exceeds a threshold, rather than uniformly at all measurement points. This local differentiation allows precise filtering where needed while avoiding unnecessary filtering operations elsewhere, thus maintaining measurement precision where required while significantly reducing overall measurement time.
Solution Approach 2:
The patent performs filtering operations partially - only at measurement points where it is strictly necessary (where wanted signal power exceeds threshold). This partial action approach avoids the excessive time consumption of applying filters at all measurement points while ensuring sufficient filtering where the wanted signal could interfere with spurious emission measurements.
2Measurement precision
If filters are tuned to frequency areas for each measurement point, then filtering effectiveness is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent determines equivalent isotropic radiated power values locally at each measurement point and compares them against a threshold to decide whether filtering is needed. This local assessment approach simplifies the overall system by avoiding the need for complex global filter configuration strategies, reducing both device complexity and operational difficulty.
Solution Approach 2:
The patent changes the operational parameter of filter application from a fixed state (filter always on) to a variable state (filter on only when EIRP exceeds threshold). This parameter-based control simplifies the system by using a clear, measurable criterion (EIRP threshold comparison) to determine filter application, reducing operational complexity.
3Measurement precision
If spurious measurement is repeated for all measurement points in a three-dimensional measurement grid, then measurement completeness is improved, but productivity decreases
Solution Approach 1:
The patent performs spurious emission measurements at all measurement points in the three-dimensional grid (maintaining completeness), but applies filtering operations only locally where needed. This approach preserves measurement completeness while significantly improving productivity by eliminating redundant filtering operations at measurement points where the wanted signal does not interfere.
Solution Approach 2:
The patent applies filtering partially - only where necessary to maintain measurement quality - rather than excessively applying it everywhere. This partial application of filtering maintains the completeness of spurious emission measurements across all measurement points while dramatically improving measurement efficiency by avoiding unnecessary filtering setup and adjustment time.
Data Source
AI summary
The present disclosure provides a method of determining a setting for performing a spurious emission measurement of a device under test. A preliminary total radiated power (TRP) measurement of a wanted signal of the device under test is performed along a three-dimensional measurement grid that includes several measurement points. Equivalent isotropic radiated power (EIRP) values are determined for the measurement points during the preliminary total radiated power measurement. The equivalent isotropic radiated power values gathered are evaluated with respect to a threshold value, thereby determining at least one subset of the equivalent isotropic radiated power values. In addition, a method of performing spurious emission measurements is described.