New Research Power Dividers With Bandpass Response

With the rapid growth of wireless technologies, there are ever higher requirements for the volume, performance and integration of the RF devices. Filters and power dividers are two important passive devices in the system. they are usually arranged in a cascade fashion in circuits. Therefore, the integration of both functions into a single device will be beneficial to reduce the interconnection loss, circuit area and manufacturing costs. According to the theory of filter design theory and the power divider, the several filtering power divider are designed with the different structures and bandwidth. They are with a good filter performance and amplitude-phase relationship.Firstly, based on the basic ultra-wideband (UWB) filtering theory of signal interference technology and the power divider design theory, a ultra-wideband filtering power divider structure is proposed, and transmission line theory is utilized to analyze, initial parameters of design can be obtained. In addition, with the slot-line isolation technology, a novel and compact structure is proposed. Then, a notch UWB filtering power divider is designed through a combination of defects microstrip (DMS) structure. The measure results proved themselves good performance.Secondly, the coupling resonance theory is utilized to design the filtering power divider. The synthesis of multi-output network is given in detail. Based on the theory, the T-type Topological model is proposed, and some design equations are given. Meanwhile, the simulation response curve of the nine-order filtering power divider function with equal and un-equal power ratio are utilized to describe the performance; Then, based on the substrate integrated waveguide (SIW), a four-orders X-band filtering power divider is designed. Besides, a new structure is proposed to improve the isolation, and according to equivalent circuit extraction and simulation, performance of model is showed, and electromagnetic simulation and physical testing are used to verify its performance; and based on the previous structure, the source/load coupling is introduced to improve the filter sharp-off factor, and the measured results verify its good performance. Finally, comparative study analysis on the spiral resonator is done. Then, the coupled resonator theory is utilized to design compact filtering in-phase power divider; then the theory of balun based on the four-port network is given, and double spiral resonators are used to achieve a four-port filtering feed network. Those devices are fabricated and measured, the results show good performance.