Abstract
The improved conflgurations with dual-mode double- square-loop resonators (DMDSLR) for tri-band application are proposed in this paper. Two sets of loops including double-square- loop and G-shaped loop are involved in the resonators. The resonant frequency equations related to DMDSLR geometries are introduced for simply designing tri-band bandpass fllter (BPF). Resonant frequencies and transmission zeroes can be controlled by tuning the perimeter ratio of the square rings and the couples. To obtain lower insertion loss, higher out-of-band rejection level, wider bandwidth of tri-band, and compact applications, the miniaturized DMDSLR structure is designed. The efiective design procedure is provided. The proposed fllter is successfully simulated and measured. It can be applied to WLAN (2.45, 5.20 and 5.80GHz) and WiMAX (3.50GHz) systems.
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