| As a novel waveguide structure, substrate integrated waveguide(SIW) with high integration, high Q value, low cost, etc., are widely used in microwave and millimeter wave circuits and systems.Based on SIW structure, several power dividers with different performance were proposed. The main research works of this dissertation are arranged as follows:1. By analyzing the characteristics of QMSIW(quarter mode substrate integrated waveguide) resonator and HMSIW(half mode substrate integrated waveguide) resonator, two filtering power were proposed based on the quasi-Wilkinson power divider structure. On this basis, by embedding a dual-mode resonator and multiple isolation resistors, the frequency selectivity and isolation performance of the dual-band filtering power divider are improved greatly. Odd-even mode analysis method and coupled resonator theory were used to analyze and design these circuits. Meanwhile, by employing SIW radial cavity, hybrid multi-via probe and radial slots, a wideband filtering power divider was designed.2. Based on the HMSIW, a wideband power divider was realized by putting the feedline on the short-circuited side. Moreover, by introducing slot isolation technology on the bottom plane, the isolation performance was enhanced. By embedding dual-mode SIR resonator, the upper stopband suppression was also improved. Based on these analysis, two-way and four-way power divider were designed. Furthermore, a high power capacity, high isolation Gysel power divider was also presented based on HMSIW.3. With the theoretical basis of holographic, a four-way power divider was designed by using SIW. The input/output horn antenna and parabolic mirror were both realized by metal via technology. The phase grate was achieved by subtracting the substrate in some certain positions. Meanwhile, the efficiency analysis of the overall circuit is carried out in-depth, which laid the foundation for the future design of such kind of power dividers. |
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