Phased Array Antenna Calibration Using Lookup-Table Phase Offsets
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Solution Overview
Problem
Existing phased array antenna calibration methods require repeated measurements and struggle with calculating definite control values due to assembly differences and nonlinearity issues between radiating elements and the antenna module.
Innovation Solution
A calibration method and system that determines an optimal phase offset for all radiating elements based on actual measurement values, using a lookup table to store characteristics of multi-function chips and account for assembly differences and nonlinearity, eliminating the need for repeated calibration measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repeated calibration measurements are performed to achieve accurate phase matching, then calibration accuracy is improved, but calibration time and operational efficiency deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-calibrating each radiating element individually before array operation. The phase offset for each element is determined in advance through separate measurement and stored in a lookup table, eliminating the need for repeated calibration measurements during operational phases. This preliminary characterization of individual element properties enables rapid phase matching when elements are combined in the array.
2Device complexity
If traditional calibration methods using representative gain and phase are used, then device complexity is reduced, but manufacturing precision deteriorates due to assembly differences and nonlinearity
Solution Approach 1:
The patent applies segmentation by dividing the calibration process into two independent stages: individual radiating element calibration and array-level phase matching. Each element is calibrated separately to determine its unique phase offset, and these individual characteristics are stored and reused during array operation. This segmentation allows precise accounting of assembly differences and nonlinearities for each element without requiring complex real-time measurements of the entire array.
3Manufacturing precision
If lookup table-based control value matching is applied to account for assembly differences and nonlinearity, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies copying by creating a lookup table that stores the pre-determined phase offsets for each radiating element. Instead of performing complex real-time measurements and calculations during array operation, the system copies and applies the stored phase offset values from the lookup table to achieve precise phase matching. This copying approach captures the effects of assembly differences and nonlinearities in advance and reuses them efficiently during operational phases.
Data Source
AI summary
A calibration system of a phased array antenna is disclosed, including an antenna device comprising the phased array antenna, a measurement device configured to measure outputted signals from each radiating element arrayed in the phased array antenna to generate measured value data, and an analysis device configured to analyze the measured value data to generate and transmit analysis data to the antenna device, wherein the antenna device is configured to determine a phase offset to be applied to each radiating element based on the analysis data.