  Electromagnetic Interference that is created by any methods can have an
important effect on electronic and telecommunication devices. Thus, the effect
of electromagnetic waves on communication systems is particularly important.
Nowadays, the slot antennas are an inseparable part of many communication
devices. In this paper, two methods have been introduced to evaluate the effect
of interference wave on slot antennas. The first method is a classic technique
based on Maxwell's equations that studied the impact of electromagnetic waves
on slot antennas by using of the radiation integrals. In the second method, the
slots, by using the Babinets principle are modeled with the linear antenna.
Then, using linear antenna circuit and then, the equivalent circuit antennas at
the receiver mode is used. Eventually, the effect of interfering waves, by
calculating the voltage induced in the antenna port, is investigated.
Simulation results are given to verify the usefulness of the two introduced
methods. The results clearly show the reasonable outcome of the proposed
methods in study of electromagnetic interference compared to the simulation
results.
