This diplexer integrates multiple passive elements into a single monolithic structure, enabling slim, compact, and reliable microelectronic solutions. The FDP2009N122157H4 diplexer operating frequency ranges correspond to GNSS L-band signals, including L1, L2, and L5. This diplexer features 50Ω impedance, 3W maximum power capacity, 10dB minimum return loss, and 1.2dB maximum insertion loss (at -40°C to +105°C).