Bandpass filters are mainly classified into the following categories:
Classified by structure
· LC bandpass filter : It achieves filtering through the series and parallel combination of inductors (L) and capacitors (C). It features a small size (size range: 10-20mm in length, 7-12mm in width, 5-10mm in height), light weight, and easy soldering. It is widely used in communication equipment.
· Ceramic bandpass filter : based on the material resonance effect, it features a wide frequency range (300MHz-10GHz), low insertion loss, and good thermal stability, and is often used in military equipment.
Classify by application scenarios
· Microwave communication category : suitable for high-frequency scenarios such as satellite communication and radar systems, with a frequency range of up to 6GHz or more.
· Mobile communication category : used for medium and high-frequency band applications such as mobile phone base stations and wireless local area networks.
· Electronic countermeasure type : specifically designed for military interference signals, it needs to maintain stable performance in harsh environments.
Classify by performance parameters
· High Q value type : with a high Q value (quality factor), it has a strong ability to suppress signals of specific frequencies and is often used in precision measuring instruments.
· Wideband type : bandwidth up to 10GHz, suitable for broadband communication systems.
There are significant differences among various categories in terms of materials, processes and performance. When making a selection, it is necessary to take into account the frequency range, volume limitations and environmental requirements of the specific application scenario.