Design of Microwave Filter Using Equal-Length Line and Embedded Structure

• Main Authors: Chih-Chen Hsu, 徐智禎
• Other Authors: Ching-Wen Hsue
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/48936939176454657798

碩士 === 國立臺灣科技大學 === 電子工程系 === 96 === Microwave band-stop filter is able to filter a given transmitted signal, but its rate of cutoff will affect the degree of signal filtering. In this thesis, we propose a new embedded two-section open-circuited band-stop filter. In this structure, the rate of cutoff is sharper than conventional microstrip line shunted with open stub; moreover, its bandwidth is also narrower. The desired bandwidth of band-stop filter can be obtained by controlling the embedded two-section open stub. Besides, we propose the chain-scattering parameters of equal-length three-section open stub in Z-domain, and then we design a discrete-time low-pass filter using three-section structure and the well-developed two-section open stub. Its performance is better than the conventional low-pass filter using frequency-domain method. Finally, we apply the embedded two-section open stub to the Chebyshev type II low-pass filter to improve its rate of cutoff. Experimental results are presented to illustrate the validity of this design method.