Abstract
Two dual-band bandpass niters (BPFs) based on the dou bly parallel-coupled stepped impedance resonators (SIRs) structures have been proposed in this paper. The coupled-SIRs with/without open-stub-loads are introduced in the filter design. The dual-band filters exhibit ing multiple zeros design operate at 2.45/5.2-GHz for the WLAN appli cations. Two three-staged filters composed of four SIRs have been pro posed with the tapped-line adapted in the I/O sections. A five-staged fil ter is constructed based on the same design principle to achieve a better band-rejection. The proposed filters have the advantages of a much wider bandwidth in both the passbands without sacrificing the passband's inser tion loss and passband flatness. The design procedure for a conventional parallel-coupled microstrip lines model is still suitable to design the pro posed filters. The proposed filters have achieved almost twice the band width of a conventional parallel-coupled lines configuration under the same design parameters. The experiments have been conducted to verify filter performance. Measured results are in good agreement with the full-wave simulation results.
Original language | English |
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Pages (from-to) | 949-955 |
Number of pages | 7 |
Journal | IEICE Transactions on Electronics |
Volume | E91-C |
Issue number | 6 |
DOIs | |
Publication status | Published - 2008 Jun |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering