Increase Test Throughput with Multi-Channel Antenna Calibration

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Introduction

For multi-channel antennas (e.g. phased arrays), a significant amount of production test time is spent on calibration. Large arrays can consist of hundreds or thousands of elements and it is necessary to characterize the phase and gain alignment between these elements to ensure precise beamforming. In addition, the test time to align these elements can increase dramatically as the number of elements increases. Hence, the ability to accelerate testing by using multiple coherent measurement channels is a significant benefit. Advancements in antenna and radar technologies also require a scalable and flexible platform that can accommodate future requirements.

This application note describes an innovative solution for accelerating the calibration of multi-channel antennas using a reference solution based on high-speed, multi-channel digitizers with real-time digital down conversion (DDC). The reference solution utilizes narrowband analysis to measure the element-to-element phase and magnitude errors of the antenna elements. This enables the test engineer to quickly and accurately identify misalignment of radiating elements and calibrate them out to ensure efficient operation of the array.

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