# Reliability Evaluation Method for Array Antenna Considering Performance Changes

## TL;DR

This paper introduces a more accurate method for evaluating the reliability of array antennas by considering performance changes due to failed components.

## Contribution

A new reliability evaluation method for array antennas that accounts for performance degradation from T/R module failures.

## Key findings

- The existing n/k system overestimates array antenna reliability by ignoring performance changes.
- A method considering performance changes improves reliability evaluation accuracy.
- The method is extended to large-scale array antennae by analyzing subarrays.

## Abstract

The existing array antenna reliability evaluation method based on the n/k system is analyzed. As the failed T/R module’s influence on the array antenna’s performance is not considered, the reliability of the array antenna is overestimated. To improve the accuracy of the array antenna reliability evaluation, the performance changes caused by T/R failures in different locations are considered. The reliability evaluation method considering the performance changes is established. The performance and probability of the array antenna’s state are calculated, and accurate reliability is obtained by calculating all the available state’s probabilities. The complexity of the reliability evaluation method is analyzed, and the reliability evaluation method for large-scale array antennae is established. The large-scale array antenna is divided into several subarrays. The performance and reliability of each subarray are analyzed, and the array antenna’s reliability is calculated through subarrays. The array antenna’s performance changes are considered with the proposed method, the overestimation problem of the existing reliability evaluation method is solved, and the accuracy of the array antenna reliability evaluation is improved.