Design of Low-Pass Filters Using Discrete-Time Domain Techniques

Lin-Chuan TSAI
Kuo-Chih CHU

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B    No.10    pp.3162-3165
Publication Date: 2008/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.10.3162
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Devices/Circuits for Communications
Keyword: 
open stubs,  Z-plane,  low-pass filter,  microstrip line,  

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Summary: 
In this paper, a new formulation of equal-length three-section open stubs having two zeros located on the unit circle and one zero at z=-1 (θ=π) in the Z-plane is presented. In particular, new filter configurations consisting of equal-length two-section open stubs, cascade lines, open stubs, and three-section open stubs are employed to emulate the discrete-time filters. To examine the validity of our formulation, we realized two discrete-time Chebyshev type II low-pass filters in the form of microstrip lines. The frequency responses of these two filters are measured to validate this new formulation.