The BD0919N08054T from Frontier Electronics is an RF Balun that operates from 869 to 960 MHz and 1805 to 1990 MHz. It has an insertion loss of less than 1.8 dB and an impedance ratio of 1:4 (50 ? unbalanced and 200 ? balanced impedance). The balun has an amplitude balance of up to 2 dB and a phase difference of 180°± 15°. It is available as a ceramic surface mount package that measures 2.00 x 1.25 x 0.90 mm.