การพฒนานวตกรรมการเรยนรสำหรบศกษาการรบกวนสนามแมเหลกไฟฟาในวงจรอเลกทรอนกสความถสง

This research presents the development and evaluation of an educational innovation kit designed to facilitate the study of electromagnetic interference (EMI) occurrences in high-frequency circuits. The primary objective is to enhance in-depth understanding of EMI mechanisms and signal filtering techniques through the application of passive frequency filters, such as Butterworth and Chebyshev filters, to reduce unwanted noise within specific frequency ranges. The developed kit comprises a low-pass filter (LPF) with a cutoff frequency of approximately 11.5 kHz, a high-pass filter (HPF) with a cutoff frequency of approximately 300 kHz, and a band-pass filter (BPF) targeting the radio frequency range of 88–108 MHz. Additionally, MATLAB-based simulation software was developed to support the calculation and design of various filter configurations. Experimental results demonstrate that the LPF effectively reduces signals above 11.5 kHz, with a transmission coefficient (S21) of -2.932 dB at the cutoff frequency. The HPF successfully reduces signals below 300 kHz, with an S21 value of -5.36 dB at the cutoff point. Furthermore, the signal generator circuit developed as part of the kit can produce sinusoidal waveforms within the 20 Hz–20 kHz range with high accuracy. The findings indicate that this innovation kit holds significant potential as an instructional tool in electrical and telecommunications engineering education, providing a practical and systematic approach to understanding signal filtering and EMI mitigation.