Experimental Investigation on Electromagnetic Coupling Between Two Sensors Working on Different Operating Frequencies

This paper proposes an experimental investigation on electromagnetic (EM) coupling between two sensors, which take a shape of microstrip antenna, in some relative positions. Two sensors, in this case sensor A and sensor B, have different resonant frequency dips, i.e., the sensor A is at 4.1 GHz, 6.62GHz, and 8.47 GHz, whereas the sensor B is at 5.54 GHz, 8.2 GHz, and 10 GHz. EM coupling between the sensors is observed through measurement in the frequency range of 1 GHz to 10 GHz based on scattering parameter of S
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and compared with simulation. The arrangement configuration is carried out in three relative positions, namely facing each other, side by side with the same orientation, and side by side with the opposite orientation. Several distances between the sensors in each configuration are evaluated on the basis of propagation region, i.e., reactive near-field, radiating near-field, and far-field. The results of investigation are then confirmed by observing the leakage of electric field on the sensor B at the frequency of 6.62 GHz when the sensor A acts as a transmitter.