Compact wideband differential bandpass filter based on the double-sided parallel-strip line and transversal signal-interaction concepts
- 1 January 2012
- journal article
- Published by Institution of Engineering and Technology (IET) in IET Microwaves, Antennas & Propagation
- Vol. 6 (2), 186-195
- https://doi.org/10.1049/iet-map.2011.0400
Abstract
Two compact wideband differential bandpass filters based on the double-sided parallel-strip line (DSPSL) and transversal signal-interaction concepts are proposed in this study. Two transmission zeros and good harmonic suppression can be achieved for the first wideband differential DSPSL filter, because of the two transmission paths with different lengths for input/output ports. In addition, another improved common suppression wideband differential DSPSL filter with two 180° phase inverters is introduced. Four λ/4 shorted lines are added to improve the passband transmission characteristic for the two differential DSPSL filters. Two prototypes with 3 dB fractional bandwidth of 94 and 117.6%, and return loss greater than 15 dB for differential mode are designed and fabricated. The measured results show good agreement with the theoretical expectations.Keywords
This publication has 19 references indexed in Scilit:
- Compact Planar Magic-T Based on the Double-Sided Parallel-Strip Line and the Slotline CouplingIEEE Transactions on Microwave Theory and Techniques, 2010
- Dual-Band and Wide-Stopband Single-Band Balanced Bandpass Filters With High Selectivity and Common-Mode SuppressionIEEE Transactions on Microwave Theory and Techniques, 2010
- A Novel Ultra-Wideband Differential Filter Based on Double-Sided Parallel-Strip LineIEEE Microwave and Wireless Components Letters, 2010
- Balanced Bandpass Filters Using Center-Loaded Half-Wavelength ResonatorsIEEE Transactions on Microwave Theory and Techniques, 2010
- Analysis and design of out-of-phase power divider with arbitrary division ratioIET Microwaves, Antennas & Propagation, 2010
- A Differential-Mode Wideband Bandpass Filter on Microstrip Line for UWB ApplicationIEEE Microwave and Wireless Components Letters, 2009
- Compact Microwave Six-Port Vector Voltmeters for Ultra-Wideband ApplicationsIEEE Transactions on Microwave Theory and Techniques, 2007
- Stopband-Extended Balanced Bandpass Filter Using Coupled Stepped-Impedance ResonatorsIEEE Microwave and Wireless Components Letters, 2007
- Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise SuppressionIEEE Transactions on Microwave Theory and Techniques, 2007
- Ultrawide-Band Transitions and New Microwave Components Using Double-Sided Parallel-Strip LinesIEEE Transactions on Microwave Theory and Techniques, 2004