1. Applicable Scenarios

LC filters are still widely used in low- or intermediate-frequency modules (e.g., baseband processing, power management). Examples include:

• Power Decoupling: Filtering power supply noise for chips (MHz range).
• Low-Frequency Signal Conditioning: Used in data conversion interfaces or clock circuits.

2. Limitations

Their application is limited in high-frequency RF front-ends (e.g., millimeter-wave bands):  

• Parasitic Effects: Parasitic parameters (equivalent resistance/capacitance) of inductors and capacitors degrade performance at high frequencies.
• Insufficient Q Factor: The low quality factor of LC filters struggles to achieve the selectivity required for high-frequency narrowband filtering.
• Size Issues: At reduced wavelengths, the physical size of discrete components becomes comparable to the wavelength, introducing distributed parameter problems.

3. Alternatives

High-frequency bands (e.g., Sub-6GHz or millimeter-wave) primarily employ:  

• Dielectric Filters: High Q factor, miniaturized, used in base station antenna channels.
• SAW/BAW Filters: Integrated into mobile phone RF front-ends.
• Cavity Filters: Used in high-performance macro base stations.

In summary, LC filters still hold value in 5G and high-speed communications, mainly in mid-to-low frequency bands or prototype verification, but in terminals and high-frequency equipment, their role is gradually being replaced by more advanced filter technologies.

Yun Micro, as the professional manufacturer of rf passive components, can offer the cavity filters up 40GHz,which include band pass filter, low pass filter, high pass filter, band stop filter.

Welcome to contact us: liyong@blmicrowave.com