A Wideband EzEx Field Probe Integrated With a Strip Line Magic-T

A wideband $E_{\textit {z}}E_{x}$ probe covering the frequency range of 1.4–7.0 GHz is proposed through the integration of a strip line magic-T. By combining a Marchand balun with its complementary structure, the magic-T achieves a wide working frequency band. The magic-T can effectively streamline complex data processing, enabling the proposed probe to offer a flexible instrument selection and achieve high measurement efficiency. A new calibration kit is further developed for the proposed probe. It effectively addresses the challenges associated with the asymmetry and probe movement commonly encountered in traditional probe calibration. A prototype of the probe is fabricated and measured. The results demonstrate a wide 1:5 working band, over 23 dB unwanted field suppression, and a good isotropy.

I. Introduction

In recent years, near-field scanning technology has made significant advancements and plays an important role in various aspects of electromagnetic interference [1] and antenna testing [2]. The electric and/or magnetic probes, typically based on a printed circuit board (PCB), serve as key components in a near-field scanning system [3]. Their performances are instrumental in determining the efficiency and accuracy of near-field scanning [4].