Symbol	Parameter Definition
${\overline{E}}_0$	electric field intensity of the initial state
${\overline{H}}_0$	magnetic field intensity of the initial state
$\overline{E}$	electric field intensity of the subtracting state
$\overline{H}$	magnetic field intensity of the subtracting state
$f_0$	resonant frequencies of the initial state
$f_1$	resonant frequencies of subtracting state
$\mu$	magnetic permeability
$\epsilon$	dielectric constant
$\Delta \mu$	change of magnetic permeability
$\Delta \epsilon$	change of dielectric constant
$\mathrm{j}$	complex vector
$V_0$	volume of the cavity
$\Delta V_1$	subtracted area in the steep gradient region
$\Delta V_2$	added area in the steep gradient region
$f_2$	resonant frequencies of the adding state in the steep gradient region
$f_{2c}$	resonant frequencies of the adding state in the flat gradient region
$\Delta V_{1c}$	subtracted area in the flat gradient region
$\Delta V_{2c}$	added area in the flat gradient region
$d$	diameter of a helical antenna
$n$	number of turns of a helical antenna
$h$	spacing between adjacent turns of a helical antenna
$m$	length of a silicon rod
$d_s$	diameter of a silicon rod
$l$	total length of the wire of helical antenna
$k$	order of resonant frequencies of the helical antenna
${\lambda }_p$	wave length of helical antenna
$f$	resonant frequencies of the helical antenna in design occasion