Title :
Synthesis of Butterworth Band-stop Filters Using Discrete-time Techniques
Author :
Tsai, Lin-Chuan ; Wu, Yi-Ting
Author_Institution :
Lunghwa Univ. of Sci. & Technol., Taoyuan
Abstract :
A new formulation of equal-length asymmetric parallel coupled line (APCLs) having zero at z=-1 (thetas = pi ) is employed to study band-stop filters. Such representations offer additional flexibility in the design of filter circuits through two extra variables. An optimization algorithm is used to tune the characteristic impedances of APCLs so that the transfer function of the signal line is close to the system function of an ideal prototype filter. Two Butterworth band-stop filters are realized in the form of microstrip lines and their frequency responses are measured to validate this new formulation.
Keywords :
Butterworth filters; band-stop filters; coupled circuits; discrete time filters; frequency response; microstrip lines; network synthesis; transfer functions; Butterworth filter; band-stop filters; discrete-time techniques; equal-length asymmetric parallel coupled line; filter circuit design; frequency response; microstrip lines; signal line; transfer function; Band pass filters; Bandwidth; Coupling circuits; Cutoff frequency; Distributed parameter circuits; Flexible printed circuits; Impedance; Microstrip filters; Microwave filters; Prototypes;
Conference_Titel :
Electron Devices and Solid-State Circuits, 2007. EDSSC 2007. IEEE Conference on
Conference_Location :
Tainan
Print_ISBN :
978-1-4244-0637-1
Electronic_ISBN :
978-1-4244-0637-1
DOI :
10.1109/EDSSC.2007.4450230
