Title :
LTCC Balun Bandpass Filters Using Dual-Response Resonators
Author :
Huang, Guo-Shu ; Wu, Chung-Hwa ; Chen, Chun Hsiung
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
The design of compact balanced-to-unbalanced (balun) bandpass filters (BPFs) in the low temperature co-fired ceramic (LTCC) technology is presented. By incorporating the proposed dual-response resonators, an LTCC balun filter with desired bandpass response in differential mode and bandstop response in common mode is obtained. To further improve the out-band suppression response of the filter, another LTCC balun BPF with two controllable transmission zeros is described. Both balun BPFs are practically implemented showing the desired filtering performance with good amplitude and phase imbalances, which are less than 0.05 dB/0.26 dB and 1.9°/2.3° in the passbands, respectively.
Keywords :
baluns; band-pass filters; resonators; LTCC balun bandpass filters; bandpass response; bandstop response; compact balanced-to-unbalanced BPF; controllable transmission zeros; differential mode; dual-response resonators; low temperature co-fired ceramic technology; outband suppression response; Band pass filters; Filtering theory; Impedance matching; Inductors; Nonhomogeneous media; Passband; Wireless communication; Balanced-to-unbalanced (balun) bandpass filter (BPF); low temperature co-fired ceramic (LTCC);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2162622
