Model BFCN-1840+ from Mini-Circuits is a bandpass filter with a center frequency of 1840 MHz and passband of 1750 to 1930 MHz. Fabricated with low-temperature-cofired-ceramic (LTCC) technology, the bandpass filter measures only 3.2 x 1.6 mm and is ideally suited for dense printed-circuit-board (PCB) applications. It provides sharp rejection peaks close to the stop-band/passband interface, with only 2 dB typical passband insertion loss. It is priced at only $3.95 in 10 to 49 quantities.