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

Volume

15

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

481

Lastpage

483

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 0.22λ_g by 0.2 λ_g. 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;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2005.851577

Filename

1458816