Title :
Coplanar Waveguide Bandpass Filters With Compact Size and Wide Spurious-Free Stopband Using Electromagnetic Bandgap Resonators
Author :
Mao, Shau-Gang ; Chueh, Yu-Zhi
Author_Institution :
Graduate Inst. of Comput. & Commun. Eng., Nat. Taipei Univ. of Technol.
fDate :
3/1/2007 12:00:00 AM
Abstract :
This work presents a novel coplanar waveguide (CPW) bandpass filter (BPF) that uses electromagnetic bandgap (EBG) resonators to reduce the size and suppress the harmonic responses. The propagation characteristic of the EBG structure is investigated by its associated equivalent circuit model. Compared with the conventional half-wavelength resonator at 5GHz, the EBG resonator is 60.5 % more compact. Based on the EBG CPW resonators, the inductively-coupled two-pole BPF with 3.8% 3-dB bandwidth and 2-dB insertion loss at 5GHz is implemented. This structure generates a 59.6% reduction in size and suppresses a second harmonic passband when compared with a conventional filter. To eliminate the third harmonic response, the proposed EBG CPW BPF further incorporates two EBG structures into its input and output ports and has the merit of a small circuit area
Keywords :
band-pass filters; coplanar waveguide components; equivalent circuits; harmonics suppression; microstrip resonators; microwave filters; photonic band gap; waveguide filters; 2 dB; 5 GHz; bandpass filters; compact filter; coplanar waveguide filter; electromagnetic bandgap resonators; equivalent circuit model; harmonic suppression; inductively-coupled filter; propagation characteristic; two-pole filter; wide spurious-free stopband filter; Band pass filters; Bandwidth; Coplanar waveguides; Electromagnetic propagation; Electromagnetic waveguides; Equivalent circuits; Insertion loss; Metamaterials; Periodic structures; Power harmonic filters; Bandpass filter (BPF); coplanar waveguide (CPW); electromagnetic bandgap (EBG) structure;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.890461