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Design and implementation of a dualband microwave filter using nonuniform lines

✍ Scribed by Jhin-Fang Huang; Zong-Min Lyu

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
197 KB
Volume
49
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this article, we propose a mapping method in which the system function of filter in z‐domain is founded by discrete‐time domain techniques as well as by chain‐scatte ring matrices of various transmission‐lines is derived to fulfill a dualbandpass microwave filter based on equal‐length nonuniform coupled lines. A dualband filter with the desired bandwidth and low insertion loss is recognized by cascading bandpass and bandstop filters. The five‐order Butterworth bandstop filter, which uses a coupled‐serial‐shunted lines structure, causes the implantation and correct placement of the bandstop filter. The wide‐band bandpass filter is implemented by the five‐order Chebyshev Type II band‐pass filter, which uses serial lines and shunted stubs lines configuration. The design process is finished by using optimization algorithms to tune the values of characteristic impedances of each transmission‐line section. Experimental results significantly agree with the theoretical values. Measurement shows that the 3 dB passband widths are about 20% for the frequency of 2.45 GHz and 10% for the frequency of 5.25 GHz. The insertion loss is about 0.831 dB at the frequency of 2.38 GHz and 1.873 dB at the frequency of 5.216 GHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 210–215, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22075

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