## Abstract This paper presents a compact microstrip low‐pass filter with ultra‐wide stopband and sharp cutoff frequency response. The conventional shunt open‐stub filter with a slot on the ground plane has a wide stopband at high frequency, and the coupled open‐stub microstrip filter has a sharp c
Ultra-wide stopband microstrip low-pass filter for harmonics suppression
✍ Scribed by Haiwen Liu; Tieying Bai; Reinhard H. Knoechel; Lingling Sun; Klaus F. Schuenemann
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 134 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
An ultra‐wide stopband microstrip lowpass filter(LPF) for harmonics suppression is introduced in this letter. The LPF is composed of three open stubs, a pair of spur‐lines, and a pair of parallel coupled‐lines with symmetrical structure. Measured results verify that the filter has a return loss better than −20 dB within 4.8–25 GHz, which is about eight times the filter cutoff frequency. The ultra‐wide stopband performance for higher harmonics suppression has great potential applications in wideband microstrip circuit and systems. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2148–2150, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22707
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