1. An Improved Microstrip Open-Loop Resonator Bandpass Filter with DGSS for WLAN Application.
- Author
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Guo, Y. C., Weng, L. H., and Shi, X. W.
- Subjects
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BANDPASS filters , *WIRELESS LANs , *ELECTRICAL harmonics , *STRIP transmission lines , *ELECTRIC resonators , *ELECTRIC lines - Abstract
This paper presents a novel harmonic-suppressed microstrip open-loop resonator bandpass filter with the different transmission line characteristic impedance of the feed line and open-loop resonator for wireless local area network (WLAN) application. To improve the stopband rejection of the filter, the dumbbell-shape defected ground structure (DGS) are applied under the feed lines to suppress the harmonics and the equivalent parameters extraction formulations of double-dumbell-shaped DGSs are the first to proposed. The bandpass filter with center frequency of 2.44 GHz were designed and fabricated on a TLX substrate with thickness of 1 mm and dielectric constant of 2.55. Measurement results show the filter has a wide stopband characteristic with 30 dB attenuation up to 7.5 GHz and only has an โ1.23 dB insertion loss while it is a little larger than the conventional one. The measured results are in good agreement with the simulated results. It can be widely used for WLAN application. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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