1. Communication Field:

Used for signal modulation, demodulation, frequency selection, anti-interference, etc. In wireless communication systems, filters can help select specific communication frequency bands, suppress interference signals in other frequency bands, and improve communication quality.

2. Power System:

Used for harmonic suppression, reactive power compensation and power quality improvement. For example, by installing passive or active filters, high-order harmonics in the power system can be suppressed, the damage of harmonics to electrical equipment can be reduced, and the stability and reliability of the power grid can be improved.

3. Audio Processing:

In audio equipment, filters can perform frequency equalization on audio signals, remove noise, and improve sound quality. For example, low-pass filters can remove high-frequency noise, high-pass filters can remove low-frequency hum, and band-pass filters can highlight audio components of specific frequencies.

4. Industrial Control:

In industrial automation systems, filters can be used for signal filtering and shaping, remove interference noise in sensor signals, and improve the accuracy and stability of control systems.

5. Aerospace:

In aerospace equipment, filters are essential to ensure the normal operation of electronic equipment and reliable signal transmission. They can suppress electromagnetic interference, ensure that signals between devices do not interfere with each other, and improve the system's anti-interference ability.