Design of the Compact Microstrip Bandpass Filter With Wide Passband and Broad Stopband and Substrate Integrated Waveguide Power Divider with Isolation

• Main Authors: HUANG,PO-LIN, 黃柏林
• Other Authors: TANG,CHING-WEN
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/2s4867

碩士 === 國立中正大學 === 電機工程研究所 === 104 === The topic of the thesis is “Design of the Compact Microstrip Bandpass Filter With Wide Passband and Broad Stopband and Substrate Integrated Waveguide Power Divider with Isolation” First, a compact microstrip bandpass filter with a wide passband and broad stopband is proposed. In order to miniaturize the circuit size, the interdigital capacitor is adopted. Moreover, the open- and short-circuited coupled lines are also employed to generate the transmission zeros around the passband skirts. The bandpass filter is developed at 2.45 GHz for the central frequency. The measured bandwidth is 45% with 10-dB for the return loss. Furthermore, the stopband can be extended to 11.7 GHz (4.8f0) with 27 dB for the suppression. In addition, the circuit size is 0.14λg0.15λg. Second, a substrate integrated waveguide power divider with isolation is presented. In order to enhance the performance of isolation, the resistor is adopted. Moreover, the miniaturization of the circuit size can be provided by the technique of half mode substrate integrated waveguide. The power divider is developed at 15 GHz for the central frequency and 10GHz for the cutoff frequency.