Title :
A miniaturized net-type microstrip bandpass filter using λ/8 resonators
Author :
Chen, Chi-Feng ; Huang, Ting-Yi ; Wu, Ruey-Beei
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
7/1/2005 12:00:00 AM
Abstract :
A novel miniaturized three-pole net-type bandpass filter using λ/8 resonators has been proposed. Asymmetric frequency characteristics of this filter exhibit a single transmission zero on the lower side of the passband at finite frequency, which is attributed to multi-path effect. Full-wave simulator IE3D is used to extract the coupling coefficients and external quality factor in order to determine the physical dimensions of this filter. The measured results are in good agreement with the simulated predictions. The overall size of the filter is only about 0.22λg by 0.2 λg. As a result, the filter has not only a small size but also a wider upper stopband up to 6.5 f0.
Keywords :
band-pass filters; microstrip filters; microstrip resonators; poles and zeros; λ/8 resonators; IE3D; coupling coefficients; finite frequency; full-wave simulator; microstrip filter; miniaturized net-type microstrip bandpass filter; multipath effect; passband filter; stepped impedance resonator; stopband filter; transmission zero; Band pass filters; Couplings; Filtering theory; Frequency; Microstrip filters; Microstrip resonators; Passband; Predictive models; Q factor; Resonator filters; Coupling coefficient; microstrip filter; net-type bandpass filter; stepped impedance resonator;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.851577
