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Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression

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3 Author(s)
Chung-Hwa Wu ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei ; Chi-Hsueh Wang ; Chun Hsiung Chen

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 examined

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 2 )