Compact Multiple-Way Power-Dividing Network with Bandpass-Filtering Response Using Spiral Resonators

A new type of multiple-way out-of-phase power-dividing network with bandpass-filtering response using spiral resonators is proposed. The basic structure unit is a compact two-way out-of-phase power divider with bandpass-filtering response. The introduction of two identical spiral-type resonators can generate transmission zeros in the lower or upper stopband to implement the bandpass-filtering function. Impedance matching and out-of-phase performance are analyzed by using the even- and odd-mode method based on four-port network theory. A four-way out-of-phase power-dividing network with bandpass-filtering response is constructed and designed according to the basic two-way out-of-phase power-dividing structure. The simulated and measured results of the fabricated out-of-phase bandpass-filtering power-dividing network demonstrate the reasonable performance of impedance matching, amplitude balance, and bandpass-filtering function.