Abstract
In this paper, we discuss diplexers using a wide-band filter and a SAW filter. The wide-band filter is fabricated in an LTCC substrate. We developed the diplexers for GPS/UWB and Bluetooth/UWB applications. The diplexers are evaluated with commercial simulators and also experimentally. Our results show that the GPS pass band (the range of 1.555 to 1.600 GHz) and the UWB pass band (the range of 3.23 to 5.13 GHz) are realized. We are able to produce the GPS/UWB diplexer at a size of 4.35 mm×5.225 mm×1.06 mm. Moreover, we realize the Bluetooth pass band (the range of 2.37 to 2.54 GHz) and the UWB pass band (the range of 3.23 to 5.21 GHz). For the Bluetooth/UWB diplexer, we achieved a size of 4.35 mm×5.92 mm×1.06 mm.
