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• W3208034616 endingPage "e0258386" @default.
• W3208034616 startingPage "e0258386" @default.
• W3208034616 abstract "In this article, a new method is developed to design a three-band miniaturized bandpass filter (BPF) that uses two asymmetrically coupled resonators with one step discontinuity and open-circuited uniform impedance resonator (UIR) to achieve Global Interoperability with Microwave Access (WiMAX) and Radio Frequency Identification (RFID) applications. First, a pair of asymmetrical step impedance resonators (ASIR) is used to implement a dual band filter, then a half wavelength uniform impedance resonator is added below to the transmission line to achieve a triple band response. The proposed filter resonates at frequencies of 3.7 GHz, 6.6 GHz, and 9 GHz with the fractional bandwidth of 7.52%, 5.1%, and 4.44%, respectively. By adjusting the physical length ratio (α) and the impedance ratio (R) of the asymmetric SIR, the proposed fundamental frequencies of the triple BPF are obtained. Moreover, the coupling coefficient (Ke) and external quality factor (Qe) are investigated between the resonators and the input/output ports of the transmission line and are calculated using full-wave EM simulator HFSS. In addition, five transmission zeros are introduced near the passbands to increase the filter selectivity. Finally, the proposed filter is designed and fabricated with a size of 13.69 × 25 mm (0.02 λg × 0.03 λg), where λg represents the guiding wavelength in the first passband. The simulated and measured results have a good correspondence, thus confirming the design concept." @default.
• W3208034616 created "2021-11-08" @default.
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• W3208034616 date "2021-10-25" @default.
• W3208034616 modified "2023-09-24" @default.
• W3208034616 title "Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter" @default.
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• W3208034616 doi "https://doi.org/10.1371/journal.pone.0258386" @default.
• W3208034616 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8544848" @default.
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