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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Robust 3D Eccentric Field Synthesis for OTA Testing via an Enhanced Spherical Vector Wave Approach.

Jianchuan Wei¹, Zhanying Peng¹, Xiaoming Chen¹

¹School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Sensors (Basel, Switzerland)

|July 15, 2026

Summary

A new method enables flexible over-the-air (OTA) testing by overcoming limitations of traditional methods. This spatial-spectral composite operator improves accuracy and stability for eccentric device testing in anechoic chambers.

Keywords:

eccentric testing multiprobe anechoic chamber (MPAC)over-the-air (OTA) testing three-dimensional (3D) field synthesis

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Area of Science:

Electromagnetics
Wireless Communication Testing
Computational Electromagnetics

Background:

Traditional over-the-air (OTA) testing requires devices at the chamber center, limiting flexible evaluation.
Spherical vector wave (SVW) methods struggle with eccentric testing due to coefficient-domain overfitting and unstable reconstruction.
Existing methods like plane wave synthesis (PWS) lack accuracy in eccentric scenarios.

Purpose of the Study:

To develop a novel method for accurate and stable 3D eccentric field synthesis in anechoic chambers.
To overcome the limitations of coefficient-domain overfitting in traditional SVW methods for off-center testing.
To enable flexible and reliable over-the-air testing of modern wireless terminals in non-central positions.

Main Methods:

Development of a unified 3D eccentric spatial-spectral composite operator.
Reformulation of the synthesis problem from coefficient-domain fitting to field-domain matching.
Incorporation of 3D offset directly into the field evaluation process.

Main Results:

The proposed operator achieves stable, oscillation-free reconstruction under significant eccentric conditions.
Numerical simulations show the method outperforms PWS by 5-15 dB in accuracy.
The conventional SVW method fails under significant eccentric conditions, while the proposed scheme maintains performance.

Conclusions:

The developed spatial-spectral composite operator provides a robust solution for 3D eccentric field synthesis.
This method enhances numerical stability and accuracy for flexible OTA testing of wireless terminals.
The findings offer a promising approach for evaluating large-scale wireless terminals in off-center configurations.