LC filters in RF circuits are primarily used to selectively pass desired frequencies, suppress unwanted signals, and enhance overall system performance. First, by leveraging the resonant behavior of inductors (L) and capacitors (C), the filter establishes specific passbands or stopbands, effectively removing undesired high-frequency or low-frequency components and improving signal purity.

In RF front-end architectures, LC filters are commonly implemented as band-pass, low-pass, or high-pass networks to suppress spurious signals, harmonics, and adjacent-channel interference. This helps the receiver accurately capture the target signal while also reducing out-of-band emissions generated by power amplifiers, ensuring compliance with RF regulatory requirements.

Because LC filters offer low insertion loss and high Q-factor characteristics, they maintain minimal signal attenuation and improve system sensitivity and signal-to-noise ratio. With advantages such as simple structure, strong tunability, and low cost, LC filters are widely used in wireless communication systems, IoT devices, and various RF modules.

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