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A Novel Microstrip Square-Loop Dual-Mode Bandpass Filter With Simultaneous Size Reduction and Spurious Response Suppression.
- Source :
-
IEEE Transactions on Microwave Theory & Techniques . May2006, Vol. 54 Issue 5, p2033-2041. 9p. 5 Diagrams, 3 Charts, 14 Graphs. - Publication Year :
- 2006
-
Abstract
- In this paper, a new capacitively stepped-impedance resonator (CSIR) is proposed to develop the microstrip square-loop dual-mode bandpass filter. Using this new design, simultaneous size reduction and spurious response suppression for the dual-mode bandpass filter can be achieved. An analytical formulation of this novel resonator is given in order to elucidate the spurious frequencies relocation design. Together with this formulation, a generalized dual-mode bandpass filter model is developed so as to ease the analysis of transmission zero and insertion loss. A prototype filter is designed at 900 MHz with 1.5% fractional bandwidth. Significant spurious suppressions up to 33 and 35 dB are measured at 1.8 and at 2.7 GHz, respectively. A circuitry size reduction of 54% is achieved when compared with that of the conventional structure. Moreover, the CSIR allows frequency tuning and, thus, a varactor-tuned filter is designed and a measured tunable center frequency between 1.5-1.62 GHz is demonstrated. Utilizing the proposed structure, not only size reduction, as well as spurious response suppression, but also center frequency tuning can be achieved. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189480
- Volume :
- 54
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Microwave Theory & Techniques
- Publication Type :
- Academic Journal
- Accession number :
- 21127602
- Full Text :
- https://doi.org/10.1109/TMTT.2006.873626