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Dual-bandpass filters with serial configuration using LTCC technology

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4 Author(s)
Ke-Chiang Lin ; Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu ; Chun-Fu Chang ; Min-Chung Wu ; Shyh-Jong Chung

A dual-bandpass filter that utilizes a serial configuration of the inductive coupled-line (ICL) filter and the capacitive coupled-line (CCL) filter is investigated in this study. Numerical analysis is presented for the difference between the ICL and CCL filters. The dual-bandpass filter has a similar behavior to the individual single-band filter around the corresponding passband. An extra transmission zero can be generated between the two passbands of the dual-bandpass filter in that the ICL and CCL filters exhibit an out-of-phase response. Four architectures of dual-bandpass filters are proposed for the 2.4/5-GHz systems. Two of them are demonstrated by the low-temperature co-fired ceramic multilayer technology. Measurements results agree quite well with the simulation ones

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 6 )