Title :
Asymmetric Dual-Passband Coplanar Waveguide Filters Using Periodic Composite Right/Left-Handed and Quarter-Wavelength Stubs
Author :
Mao, Shau-Gang ; Chueh, Yu-Zhi ; Wu, Min-Sou
Author_Institution :
Graduate Inst. of Comput. & Commun. Eng., Nat. Taipei Univ. of Technol.
fDate :
6/1/2007 12:00:00 AM
Abstract :
A novel dual-passband coplanar waveguide (CPW) filter periodically loaded with the composite right/left-handed (CRLH) short-circuited stubs and the quarter-wavelength open-circuited stubs in asymmetric configuration is presented. The unit-cell equivalent circuit of the periodic structure in conjunction with Floquet´s theorem is employed to find the propagation characteristics of passband and stopband regions. Unlike the conventional quarter-wavelength transmission-line inverter suitable only for a narrow frequency range, the dual-band inverter is adopted in the dual-passband filter to achieve a better frequency response within two operating bands. The performance of the 2.4/5.8-GHz third-order CRLH CPW dual-passband filter with 52% and 23% bandwidths is measured and validated by full-wave simulation. Two arbitrary passband regions are presented and the stopband within the passbands can be controlled by varying the length of open-circuited stub, supporting the flexibility and compactness of the proposed dual-passband filter
Keywords :
UHF filters; band-pass filters; coplanar waveguide components; equivalent circuits; frequency response; microwave filters; periodic structures; waveguide filters; 2.4 GHz; 5.8 GHz; Floquet theorem; asymmetric dual-passband coplanar waveguide filters; dual-band inverter; equivalent circuit; frequency response; full-wave simulation; passband region; periodic composite right/left-handed stubs; periodic structure; propagation characteristics; quarter-wavelength stubs; short-circuited stubs; stopband regions; Band pass filters; Bandwidth; Coplanar waveguides; Dual band; Equivalent circuits; Frequency response; Inverters; Passband; Periodic structures; Transmission lines; Composite right/left-handed (CRLH) coplanar waveguide (CPW); dual-passband filter; periodic structure;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.897787
