Technical Papers
A Design Method of Compact Lumped-Element Matching Circuits for Diplexers Using SAW Filters
2018 Volume 11 Pages E17-015-1-E17-015-8
Details
2018 Volume 11 Pages E17-015-1-E17-015-8
In this paper, a design method of compact matching circuits based on lumped elements for diplexers is proposed. This method only uses four elements for impedance matching of a common port and it is not required to modify a part of the filters. It is useful for fabricating compact diplexers on a printed circuit board. It can be applied to the diplexers with a wide band gap between two passbands. A prototype diplexer is designed. It is used as a receiver of the wideband code division multiple access Band 5 and the global positioning system. The diplexer achieves a compact size (8 mm × 8 mm) and insertion losses are less than 2.0 dB in each passband.
