Substrate-Integrated Rectangular Waveguide Bandpass Filters

• Main Authors: Jhih-Heng Jian, 簡誌亨
• Other Authors: 陳俊雄
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/42086306967810794337

碩士 === 國立臺灣大學 === 電信工程學研究所 === 95 === This thesis uses two kinds of methods to construct vertical metal walls in printed circuit board (PCB), thereby forming the substrate integrated waveguide (SIW) bandpass filters. Several filters are designed by those structures , using the PCB of Ro4003. Firstly, a three-pole bandpass filter is constructed, using the method of K-inverter. The resonator is made of a half-wavelength rectangular waveguide. The vertical metal walls of the waveguide are realized by the silver glue. For the purpose of measurement, a transition circuit to transform rectangular waveguide to 50ohm microstrip line in both ports of waveguide is designed. Another design uses the via-holes to construct the vertical metal walls, thereby realizing the rectangular resonant cavities. For excitation, the input and output resonant cavities are fed by the properly designed slotline-to-waveguide transition circuits. The filter is designed by the method of coupling coefficient and the frequency responses are Butterworth and linear phase. Lastly, the rectangular resonant cavities are replaced by triangular resonant cavities so as to reduce the circuit area. Specifically a three-pole bandpass filter and a six-pole bandpass filter with Chebyshev and Butterworth responses are implemented and examined.