Compact sub-wavelength microstrip band-reject filter based on inter-digital capacitance loaded loop resonators
✍ Scribed by Yi Peng; Wen-Xun Zhang
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 252 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
In this article, the microstrip band‐reject filters based on inter‐digital capacitance loaded loop resonators (IDCLLRs) are proposed by using meandered microstip‐line, which enhances the coupling to the resonators and provides more structural parameters for flexible design. First, an IDCLLR‐based single‐stage meandered prototype of band‐reject filter has been designed and fabricated. The measured frequency response shows 2.2% relative stop‐bandwidth (−10 dB) with −21 dB maximal insertion‐loss at 3.34 GHz. Furthermore, the resonant frequencies versus inter‐digital length are studied. Finally, an IDCLLR‐based three‐stage meandered prototype of band‐reject filter was designed and fabricated too, the measured relative stop‐bandwidth (−10 dB) is 6.2% and the insertion‐loss at center frequency approaches −42 dB. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 166–169, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24885