Dual-Band Semi-Lumped-Element Power Dividers at UHF/SHF Bands

In this paper, a design method of a semi-lumped-element power divider with dual-band characteristics in UHF/SHF bands is presented. The circuit configuration has the Wilkinson power divider composed of only nine lumped-element components. The design is performed by even-/odd-mode analysis techniques and an impedance matching theory. In order to validate this approach a proposed divider at a center frequency of 920 MHz has been simulated and fabricated. To implement the ideal circuit model, some structures of spiral/meander transmission lines are used as inductors in consideration with high frequency compatible and size reduction. The simulation and experimental results are agreed very well. Over the 45.9% relative bandwidth from 0.80 to 1.28 GHz, return losses of input/output ports are better than 18 dB, maximum power division is -3.40 dB, and phase ripple is about ±2.6°. Finally, good performances of this proposed power divider are experimentally validated, showing the advantages of low cost, small size, and easy fabrication, etc. Also, it presents an excellent candidate for dividing microwave signal in microwave systems of UHF/SHF bands.