Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression
- 5 February 2007
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 55 (2), 287-295
- https://doi.org/10.1109/tmtt.2006.889147
Abstract
Novel balanced coupled-line bandpass filters, using suitable balanced coupled-line sections and quarter-wavelength resonators, are proposed. For design purposes, the differential- and common-mode equivalent half-circuits are established. Based on these circuits, a better balanced filter structure is implemented so that the desired differential-mode response may be realized and the level of common-mode noise may be minimized simultaneously. Besides, a suitable capacitive or inductive cross-coupled effect is introduced so as to create two transmission zeros for improving the filter selectivity; however, it also enhances the signal imbalance and degrades the common-mode rejection. In this study, various second- and fourth-order balanced filters are implemented to discuss the associated differential-mode responses and the signal-imbalance phenomena resulted from the cross-coupled effect. Specifically, the fourth-order filter with a common-mode rejection ratio of 40 dB within the passband is demonstrated and examinedKeywords
This publication has 16 references indexed in Scilit:
- An LTCC balanced-to-unbalanced extracted-pole bandpass filter with complex loadIEEE Transactions on Microwave Theory and Techniques, 2006
- A balance filter with DC supply for Bluetooth/spl trade/ modulePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Implementation of a miniaturized lumped-distributed balun in balanced filtering for wireless applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- A 40 GHz LTCC receiver module using a novel submerged balancing filter structurePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- A miniaturized lumped-distributed balun for modern wireless communication systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- A monolithic or hybrid broadband compensated balunPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Parametric analysis of improved planar balun circuits for wireless microwave and RF applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Compact and broad-band three-dimensional MMIC balunIEEE Transactions on Microwave Theory and Techniques, 1999
- A modified parallel-coupled filter structure that improves the upper stopband rejection and response symmetryIEEE Transactions on Microwave Theory and Techniques, 1991
- Parallel-Coupled Transmission-Line-Resonator FiltersIEEE Transactions on Microwave Theory and Techniques, 1958