Abstract
In this paper, a novel microstrip structure is developed to realize a dual-band bandpass filter for 2.4/5.2 GHz WLAN application. The proposed bandpass structure uses two open-loop stepped impedance resonators (SIRs) with two internal and external stubs. The two interest frequency bands may be independently controlled by adjusting the dimensions of the structure. The dual-band bandpass filter developed in this paper exhibits excellent performances with two passbands centered at 2.4 GHz and 5.2 GHz and the fractional bandwidth of 5.0% and 2.7% respectively. The measured results are in good agreement with simulated results. Additionally, it can be easily fabricated and should be used in applications where miniaturization and compatibility with microstrip technology are of primary concern.
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