Ultra wide stop band LPF with using defected microstrip structures

Author

Mallahzadeh, Ali Reza ; Rahmati, Bahman ; Alamolhoda, M. ; Sharifzadeh, R. ; Ghasemi, A.H.

Author_Institution

Electr. & Electron. Eng. Dept., Shahed Univ., Tehran, Iran

fYear

2012

fDate

26-30 March 2012

Firstpage

1

Lastpage

3

Abstract

A novel harmonic-suppressed microstrip stepped impedance lowpass filter (LPF) using Defected Microstrip Structure (DMS) is proposed. In order to cause the spurious passband suppression, appropriate geometries of DMS resonators have etched in the low impedance sections. Due to the attenuation poles of two kinds of resonators, it is found that harmonic responses are not only suppressed effectively, but a wide stopband can be also obtained. A demonstration filter with cutoff frequency at 2.5 GHz has been designed, fabricated and measured. The proposed filter also exhibits a very wide stopband of 145% (referred to a suppression degree of 20 dB).

Keywords

band-stop filters; defected ground structures; electric impedance; harmonics suppression; low-pass filters; microstrip resonators; microwave filters; ultra wideband antennas; DMS resonator; attenuation pole; defected microstrip structure; frequency 2.5 GHz; harmonic suppression; lowpass filter; microstrip stepped impedance LPF; passband suppression; ultra wide stop band filter; Filtering theory; Impedance; Low pass filters; Microstrip; Microstrip filters; Microwave filters; Resonator filters; Defected Microstrip Structure (DMS); harmonics suppression; stepped impedance lowpass filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (EUCAP), 2012 6th European Conference on

Conference_Location

Prague

Print_ISBN

978-1-4577-0918-0

Electronic_ISBN

978-1-4577-0919-7

Type

conf

DOI

10.1109/EuCAP.2012.6206280

Filename

6206280