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Novel U-Slot and V-Slot DGSs for Bandstop Filter With Improved Q Factor
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- Authors
- Duk Jae Woo, Taek Kyung Lee, Jae Wook Lee, Cheol Sig Pyo, Won Kyu Choi
- Issue Date
- 2006-06
- Citation
- IEEE Transactions on Microwave Theory and Techniques, v.54, no.6, pp.2840-2847
- ISSN
- 0018-9480
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- Novel slot-shaped defected ground structures (DGSs) on the microstrip line are presented to provide a band-rejection property with an improved Q factor. Two different geometries (U-slot and V-slot) are investigated. U-slot and V-slot DGSs have simple shapes compared to the conventional DGSs, however, they provide more steep rejection characteristics. The Q factor of the band-rejection property for the U-slot DCS increases when the distance between two slots in the U-shape decreases. Similarly, the V-slot DCS provides a higher Q characteristic when the slot angle is reduced. Two bandstop filters are designed and fabricated employing three cascaded U-slot DGSs and V-slot DGSs, respectively. Experimental result shows that the high-Q band-rejection filter with three U-slot DGSs provides Q of 38.6. A fabricated filter with three cascaded V-slot DGSs also rejects the signals at the frequencies from 3.5 to 4.3 GHz with more than 20-dB suppression. © 2006 IEEE.
- KSP Keywords
- Band rejection filters, Different geometries, Experimental Result, High Q, Microstrip Line, Q-band, Quality-factor(Q-factor), U-shape, U-slot, V-slot, band-stop filter