Systematic Characterization of Dual Probes for Electromagnetic Near-Field Measurement

Design and characterisation of a dual probe with double‐loop structure for simultaneous near‐field measurement

“…And E meas is the electric field ( Z ‐direction) measured by the dual probe as shown in Figure 4. On the contrary, if the measured magnetic field component is larger than E meas − γ e + 6 dB, where 6 dB is the margin of measurement [32], the measured magnetic field is accurate [29]. Similarly, the magnetic field isolation is calculated by the same way.…”

“…The isolation of magnetic field and electric field is a very important parameter for the dual probe. It is related to the design of the probe [29]. This parameter evaluates the interaction between the measured electric field and magnetic field components.…”

“…Since the electric field or magnetic field component can not be totally suppressed in the actual measurement process, it is necessary to construct an environment with strong electric field component, weak magnetic field component, strong magnetic field component and weak electric field component respectively. Therefore, the magnetic field isolation (γ h ) and electric field isolation (γ e ) are characterised as follows [29].…”

“…In Equations ( 14) and ( 15), S ds,max , S cs,min , S cs,max and S ds,min are the maximum magnetic field response, the minimum electric field response, the maximum electric field response and the minimum magnetic field response respectively. According to the standing wave principle, the open or short load is connected to the microstrip terminal to generate standing waves [29]. In Figure 4, when y = 0, θ = 0°, the dual probe measures the field component of the microstrip line along the x-direction, where the probe moving step is 0.1 mm and liftoff = 1 mm.…”

“…Since the electric field or magnetic field component can not be totally suppressed in the actual measurement process, it is necessary to construct an environment with strong electric field component, weak magnetic field component, strong magnetic field component and weak electric field component respectively. Therefore, the magnetic field isolation ( γ h ) and electric field isolation ( γ e ) are characterised as follows [29]. $$$\begin{array}{rl}\hfill {\gamma }_{h}& =\frac{{E}_{\text{max}}}{{H}_{\text{min}}}\hfill \\ \hfill & ={S}_{cs,\mathrm{m}\mathrm{a}\mathrm{x}}-{S}_{ds,\mathrm{m}\mathrm{i}\mathrm{n}}+\zeta \ [\mathrm{d}\mathrm{B}\cdot V/A],\hfill \end{array}$$$ $$$\begin{array}{rl}\hfill {\gamma }_{e}& =\frac{{H}_{\text{max}}}{{E}_{\text{min}}}\hfill \\ \hfill & ={S}_{ds,\mathrm{m}\mathrm{a}\mathrm{x}}-{S}_{cs,\mathrm{m}\mathrm{i}\mathrm{n}}-\zeta \ [\mathrm{d}\mathrm{B}\cdot A/V],\hfill \end{array}$$$ where the term ζ is denoted by $$$\zeta =C{F}_{e}-C{F}_{h},$$$ …”