  This paper systematically studied the simultaneous measurement of two
parameters by a LC-type passive sensor from the theoretical perspective. Based
on the lumped circuit model of the typical LC-type passive dual-parameter
sensor system, the influencing factors of the signal strength of the sensor as
well as the influencing factors of signal crosstalk were both analyzed. It is
found that the influencing factors of the RF readout signal strength of the
sensor are mainly quality factors (Q factors) of the LC tanks, coupling
coefficients, and the resonant frequency interval of the two LC tanks. And the
influencing factors of the signal crosstalk are mainly coupling coefficient
between the sensor inductance coils and the resonant frequency interval of the
two LC tanks. The specific influence behavior of corresponding influencing
factors on the signal strength and crosstalk is illustrated by a series of
curves from numerical results simulated by using MATLAB software. Additionally,
a decoupling scheme for solving the crosstalk problem algorithmically was
proposed and a corresponding function was derived out. Overall, the theoretical
analysis conducted in this work can provide design guidelines for making the
dual-parameter LC-type passive sensor useful in practical applications.
