Compact dual-band filter design using crossly coupled λ/4 SIRs embedded with spur-line for WLAN applications
✍ Scribed by Pow-Wen Chen; Min-Hua Ho; Wanchu Hong
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 202 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
This article presents a compact dual‐band bandpass filter (BPF) design using λ/4 stepped impedance resonators (SIRs) embedded with spur‐line for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2–5.8 GHz. The crossly coupled mechanism is used in the filter design to provide attenuation poles by the passband edges for enhancing the signal selectivity and increasing stopband rejection levels. The tapped‐line is incorporated in feed structure to save the circuit space. The spur‐line is embedded in each I/O SIRs to push the upper stopband limit to a higher frequency. Experiments are conducted to verify the circuit performance. A good agreement is observed between the simulation and the measurement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2807–2810, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23846