Designs for Ultra Broad-Band Band-Pass Filters Using Microstrip Cavity-Couplers

• Main Authors: Chin-Chung Chuang, 莊志忠
• Other Authors: Eric S. Li
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/qsjd8e

碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 96 === This thesis mainly focuses on the the structure of microstrip vertical transitions of circular cavity-couplers by changing the geometric shapes of slot aperture and microstrip terminated by open-circuited stubs，to achieve the purpose of bandwidth enhancement. By cascading other filter techniques can minimize the pass-band insertion loss and furthermore expand the rejection-band to 30 GHz，which allows this ultra broad-band band-pass filter to become high selectivity. The first model of stepped impedance low-pass filter, under certain modifications, can extend the range of rejection-band to attenuate the unnecessary signals to pass-band while the second model of low-pass filter, constructed of high quality slow-wave resonator, can effectively diminish the noises near the pass-band. Lastly, by using the interdigital from microstrip can further reduce the noises from other places. This paper uses FEM as a base to develop a stimulation of High Frequency Structure Simulation, which focuses on the past precise simulation experiences of the structure of microstrip vertical transitions, the results of such stimulation is yet to be proven from statistical results.