Configuration of a stepped impedance bandpass filter

✍ Scribed by Xuedong Wang; Bin You; Wusheng Ji; Ying Li

• Book ID: 102515657
• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 121 KB
• Volume: 39
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.11224

✦ Synopsis

Abstract

This paper describes the design of a compact stripline ceramic filter, using short‐circuit stepped‐impedance resonators (SIRs) to enhance the harmonic stop‐band response. Moreover, this filter has a very small size of 3.6 mm × 3.0 mm × 0.5 mm and a low insertion loss of 0.6 dB in the passband. The filter's response, with a design center frequency of 2390 MHz and 3‐dB bandwidth at 250 MHz (10.4%), shows an increase in the first harmonic frequency to 9004 MHz. At three times the fundamental passband frequency (7160 MHz), stop‐band attenuation is better than −40 dB. The results demonstrate the usefulness of SIRs for improving the stop‐band performance of bandpass filters. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 380–383, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11224