Design of an ultra wideband bandpass filter by using microstrip spur-line and ring shaped DGS with improved out of band response

Author

Yadav, Dibakar ; Moyra, Tamasi ; Debbarma, Kaushik

Author_Institution

Nat. Inst. of Technol., Agartala, India

fYear

2014

Firstpage

1

Lastpage

4

Abstract

This paper presents an Ultra Wideband (UWB) microstrip Bandpass Filter (BPF) using spur-line and ring shaped Defected Ground Structure (DGS) with improved out of band rejection. This microstip UWB provides a 3 dB bandwidth from 3.1 GHz to 10.6 GHz, with centre frequency of 6.85 GHz. The attenuation band has been improved using cascaded step-impedance ladder type L-C Low pass filter (LPF) in addition to main ultra wideband filter structure. The final response provides an UWB with a negligible passband insertion loss around the midband. This structure also provides good sharpness factor in the rising edge and falling edge of 10.33 dB/GHz and 18.34 dB/GHz respectively, and attenuation greater than 20 dB up to 32.5 GHz outside the passband.

Keywords

band-pass filters; band-stop filters; defected ground structures; ladder filters; low-pass filters; microstrip filters; microstrip lines; LC low pass filter; LPF; UWB microstrip BPF filter; band rejection; cascaded step-impedance ladder; frequency 3.1 GHz to 10.6 GHz; microstrip spur-line; passband insertion loss; ring shaped DGS; ring shaped defected ground structure; ultra wideband bandpass filter; Band-pass filters; Filtering theory; Microstrip filters; Microwave filters; Passband; Resonator filters; Ultra wideband technology; DGS; LPF; Wideband band pass filter; microstrip; spur-line;

fLanguage

English

Publisher

ieee

Conference_Titel

Convergence of Technology (I2CT), 2014 International Conference for

Print_ISBN

978-1-4799-3758-5

Type

conf

DOI

10.1109/I2CT.2014.7092129

Filename

7092129