Design of Ultra-Wideband Bandpass Filters and Dual-Band Bandpass Filters with Controllable Passband Frequency and Bandwidth

• Main Authors: Hung, Tsung-Yi, 洪宗益
• Other Authors: Tang, Ching-Wen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/32199265642787682192

碩士 === 國立中正大學 === 電機工程研究所 === 99 === The article is divided into two parts. The introduction in the first part is design of wideband bandpass filters and wideband bandstop filter. The wideband bandpass filter can be analyzed with even-odd mode method. Moreover, passband’s bandwidth can be controlled by properly select the impedances within the wideband bandpass filter. Furthermore, the cascaded bandstop filter is used to suppress the harmonics which come from the wideband bandpass filter. Likewise, the stopband’s bandwidth can be controlled by properly select the impedances within the wideband bandstop filter. The design of the dual-band bandpass filters are introduced in the second part. The passband’s central frequency and bandwidth of these filters can be controlled by properly choosing the impedances of the open stubs and coupled lines. All of the above mentioned circuits are simulated with the full-wave electromagnetic simulator IE3D. Moreover, the prototypes of these circuits are fabricated and measured. The good matched results between electromagnetic simulation and measurement can evidence the availability of all proposed circuits.