A compact broadband quadrature power splitter on LTCC

In this paper a compact broadband quadrature power splitter (QPS) on LTCC and its design procedure are presented. With suitable design of layout and fabricated on LTCC (low temperature cofired ceramic), both the high pass network and parasitic component are considered for bandwidth extension. This will enhance the fractional bandwidth of the phase adjusting network as well as the input matching bandwidth for QPS. The measured results show a phase error of less than +/- 5° and a power imbalance at output port of less than 0.6dB from 2.9~7.2GHz. The return loss and isolation is better than 10 dB. The size of QPS excluding pad is 7.1mm×6.2mm.