Mode filter
Band-pass
with variable passband
Band-pass
with variable centre frequency
Variable band-stop filter
Electronic Filter Symbols © ASUTPP - Some rights reserved - This file is licensed under the Creative Commons (CC BY-NC 4.0) license - https://creativecommons.org/licenses/by-nc/4.0/deed.en - Rev.07 All Electrical & Electronic Symbols in https://www.asutpp.com (based on IEC and IEEE standarts)
High-pass filter Filter, general symbol
Low-pass filter Band-pass filter Band-stop filter
Band-pass
filter
switched by gas discharge
filter
filter
Surface acoustic wave (SAW) filter