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Main >> Applications >> Sample problems >> Bandpass filter simulation

Bandpass filter transfer function

QuickField simulation example

This is an example of the bandpass filter simulation, performed with QuickField software.

Problem Type
Plane-parallel problem of AC magnetics.

Geometry
bandpass filter circuit

Given
R1 = 150 Ohm, R2 = 150 Ohm;
C1 = 840 pF, C2 = 0.1637 uF, C3 = 852 pF, C4 = 0.0558 uF;
L1 = 12.11 mH, L2 = 62.08 uH, L3 = 11.91 mH, L4 = 182.3 uH.

Task
Calculate the filter transfer function.

Solution
The set of QuickField problems is automatically generated by the Label Mover tool. The input signal value is set to 1 V. The output signal is measured at R2.
QuickField cannot simulate standalone circuits. Therefore the artificial AC magnetic problem field simulation problem with specified circuit was created. The results are taken from the circuit only.
Study was performed in two stages. During the first stage wide frequency range was analyzed (from 0 Hz to 1 MHz with step of 50 kHz). Then the band pass was analyzed in more detail (from 40 to 60 kHz with step of 0.1 kHz).

Results
Amplitude transfer function k(f) (scaled 1000 times), and phase transfer function of the bandpass filter.