Multilayer Ceramic Band Pass Filters Walsin Multilayer Ceramic Band Pass Filters are designed to pass frequencies in the range of 2400MHz to 2500MHz. These multilayer ceramic bandpass filters feature a miniature footprint, low insertion loss, 50Ω or 75Ω impedance, and Low-Temperature Co-fired Ceramics (LTCC) process. The multilayer ceramic bandpass filters are ideal for 2.4GHz ISM band applications, BLUETOOTH®, HomeRF, and wireless LAN 802.11b/g/n.