A Compact Wideband Bandpass Filter Using Transversal Resonator and Asymmetrical Interdigital Coupled Lines
- 5 March 2008
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Microwave and Wireless Components Letters
- Vol. 18 (3), 173-175
- https://doi.org/10.1109/lmwc.2008.916780
Abstract
A compact wideband microstrip bandpass filter using transversal resonator and asymmetrical interdigital coupled lines is proposed in this letter. A wide passband is first constructed using transversal signal-interference technique, resulting a pair of transmission zeros at each side of the desired passband. By driving this transversal resonator with two asymmetrical interdigital coupled lines at two sides, five extra transmission zeros are generated in the lower/upper stopbands with excellent dc-choked property, thus making up a wide passband with improved out-of-band performance. This wideband microstrip filter is then designed, implemented and experimented. Good insertion/return losses, flat group delay and good out-of-band rejections are achieved as demonstrated in both simulation and experiment.Keywords
This publication has 12 references indexed in Scilit:
- Asymmetric Parallel-Coupled Lines for Notch Implementation in UWB FiltersIEEE Microwave and Wireless Components Letters, 2007
- EBG-Embedded Multiple-Mode Resonator for UWB Bandpass Filter With Improved Upper-Stopband PerformanceIEEE Microwave and Wireless Components Letters, 2007
- Folded Compact Ultra-Wideband Stepped-Impedance Resonator FiltersIEEE/MTT-S International Microwave Symposium, 2007
- A Novel Ultra-Wideband (UWB) Bandpass Filter (BPF) With Pairs of Transmission ZeroesIEEE Microwave and Wireless Components Letters, 2007
- Application of Electromagnetic Bandgaps to the Design of Ultra-Wide Bandpass Filters With Good Out-of-Band PerformanceIEEE Transactions on Microwave Theory and Techniques, 2006
- Compact Ultra-Wideband Bandpass Filters Using Composite Microstrip–Coplanar-Waveguide StructureIEEE Transactions on Microwave Theory and Techniques, 2006
- High-rejection wideband signal-interference microstrip filters using rat-race couplersElectronics Letters, 2006
- Ultra-wideband (UWB) bandpass filters using multiple-mode resonatorIEEE Microwave and Wireless Components Letters, 2005
- Using the branch-line directional coupler in the design of microwave bandpass filtersIEEE Transactions on Microwave Theory and Techniques, 2005
- Design of sharp-rejection and low-loss wide-band planar filters using signal-interference techniquesIEEE Microwave and Wireless Components Letters, 2005