Title :
Dual-Band Balun Bandpass Filter With Hybrid Structure
Author :
Huang, Guo-Shu ; Chen, Chun Hsiung
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
7/1/2011 12:00:00 AM
Abstract :
Dual-band balanced-to-unbalanced (balun) bandpass filter (BPF) is proposed, using the hybrid structure with resonators implemented on the upper microstrip plane and bottom coplanar-waveguide (CPW) plane, respectively. By providing two coupling paths through microstrip and CPW planes, one may separately control the two passbands and also increase the freedom in filter design. The implemented dual-band balun BPF centered at 2.4 and 5.4 GHz shows the desired filtering performance with good amplitude and phase imbalances, which are less than 0.13/0.08 dB and 0.82°/1.65° in the two passbands, respectively.
Keywords :
baluns; band-pass filters; coplanar waveguides; microstrip filters; microwave filters; resonator filters; coplanar-waveguide plane; dual-band balanced-to-unbalanced bandpass filter; dual-band balun bandpass filter; frequency 2.4 GHz; frequency 5.4 GHz; hybrid structure; microstrip plane; resonator; Band pass filters; Coplanar waveguides; Dual band; Impedance matching; Microstrip; Passband; Resonant frequency; Bandpass filter (BPF); dual-band balanced-to-unbalanced (balun);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2144965
