Custom LC Filter_Passive Filter

I. Product Features and Description

LC filters (also known as LC passive filters) operate on the principle of using series and parallel combinations of inductors and capacitors to achieve filtering. Inductors exhibit inductive reactance to high-frequency signals, while capacitors exhibit capacitive reactance to low-frequency signals. By adjusting the values of the inductors and capacitors, signals within specific frequency ranges can be selectively transmitted or blocked. LC filters offer excellent selectivity and roll-off characteristics, enabling steep attenuation near the cutoff frequency, thereby effectively eliminating high-frequency noise or low-frequency clutter.

LC filters can be broadly categorized into four basic types: LC high-pass filters, LC low-pass filters, LC band-pass filters, and LC band-stop filters. Among these, LC low-pass filters have an upper frequency limit of 300MHz to 8GHz; LC high-pass filters have a lower frequency limit of 500MHz to 18GHz; LC band-pass filters cover a frequency range of 0.5MHz to 6GHz; and LC band-stop filters can achieve a low-end frequency of 50MHz and a high-end frequency of 4GHz. These filters feature a 0.05dB Chebyshev function, a 3dB standard bandwidth of 0.5% to 150%, orders ranging from 2 to 12, easy soldering installation, good solderability, compact size (L: 20-70 mm; W: 10-20 mm; H: 7-12 mm), lightweight, convenient soldering, easy debugging, and straightforward maintenance.

II. Product Models and Parameters

III. Precautions and Applications

LC filters (also known as LC passive filters) are widely used in aerospace, aviation, maritime, radar, electronic countermeasures, remote sensing, telemetry, navigation, civil aviation, airport control towers, ships, microwave communications, subway communications, public security and firefighting, mobile communications, satellite communications, scientific research, medical equipment, deep-sea exploration, high-definition image transmission, broadcasting, television, and other microelectronic communication devices. During use, the input and output ports are interchangeable, but it is important to ensure that the casing is properly grounded; otherwise, out-of-band rejection and flatness performance may be affected. When soldering, the temperature should not be too high, and the duration should not be too long. If reflow soldering is used, the recommended solder melting point temperature is 180°C; wave soldering is not recommended. Products should be stored in a warehouse with an ambient temperature of -10°C to 40°C, relative humidity not exceeding 80%, and free from acidic, alkaline, or other harmful gases. Immersion cleaning is prohibited; it is recommended to wipe with alcohol.

Our company offers LC filters (passive filters) with various interface types. Customized LC band-pass filters, LC high-pass filters, LC low-pass filters, and LC band-stop filters can be produced with orders ranging from 3 to 7, 3dB bandwidth from 3% to 200%, frequency range from 0.5MHz to 6GHz, and dimensions (length: 10-20mm; width: 7-12mm; height: 5-10mm). LC filters can be customized according to user requirements.