LC Filter

LC filter is a passive electronic filter composed of inductors (L) and capacitors (C) arranged in various topologies, such as low-pass, high-pass, band-pass, or band-stop configurations. It offers design flexibility, low cost, and good performance across a wide frequency range, making it widely used in RF and analog circuits for signal selection, noise suppression, and impedance matching.

LC duplexer integrates two LC filters—typically a transmit filter and a receive filter—into a single module with a common antenna port. It enables simultaneous transmission and reception over a single antenna while providing sufficient isolation between the TX and RX paths. With its compact size and low cost, it is commonly used in wireless communication devices such as handsets, routers, and small base stations.

Navigation IF (intermediate frequency) filter is an LC-based filter designed for the intermediate frequency stage of GNSS receivers, supporting systems such as GPS, Beidou, Galileo, and GLONASS. It provides narrow bandwidth, low insertion loss, and high out-of-band rejection to suppress interference and noise, ensuring accurate signal processing for reliable positioning, timing, and navigation performance.