Design of the Compact Slotted-Ground-plane Resonator

• Main Authors: Wan-ti Wang, 王萬迪
• Other Authors: Chien-Jen Wang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/81869983366698550896

碩士 === 國立臺南大學 === 電機工程學系碩士班 === 101 === In this thesis, a new design for the compact low-pass filter (LPF) with a wide rejection band is presented by utilizing the slotted-ground-plane (SGP) structure. A modified-π slot is etched in the ground plane to excite three different resonant modes. A wide rectangular stub, which overlaps the connection slots, connects to the microstrip transmission line. This technique significantly enhances the rejection characteristics. A reversed-C slot is embedded inside the modified-π slot in order to lower the initial resonant frequency of the LPF. In particular, two shorted quarter-wavelength branch slots are used to generate two transmission zeros such that the high-frequency rejection performance can improve. An equivalent RLC circuit is proposed to model the introduced LPF and corresponding RLC parameters are extracted. A fabricated filter rejects the signals at the frequencies from 1.97 to 12.0 GHz with more that -20-dB suppression.