A Compact Lowpass Filter Using Interdigital Line Resonator with Wide Stopband

A compact (0.14 λ g  × 0.18 λ g ), low-cost microstrip lowpass filter of 2 GHz cut-off frequency is presented in this paper. The proposed filter structure is designed using interdigital line resonator (ILR) which makes it compact in size. The inclusion of dumbbell-shaped defected ground structures w...

Full description

Saved in:
Bibliographic Details
Published in:Iranian journal of science and technology. Transactions of electrical engineering 2019-09, Vol.43 (3), p.469-478
Main Authors: Sen, Sarbani, Moyra, Tamasi
Format: Article
Language:English
Subjects:
Electrical Engineering
Engineering
Research Paper
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A compact (0.14 λ g  × 0.18 λ g ), low-cost microstrip lowpass filter of 2 GHz cut-off frequency is presented in this paper. The proposed filter structure is designed using interdigital line resonator (ILR) which makes it compact in size. The inclusion of dumbbell-shaped defected ground structures with the ILR structure offers excellent harmonic suppression and broader attenuation band up to 20 GHz, i.e. stopband rejection is almost 164%. The insertion loss of the filter is lower than 0.3 dB. A modification in J-inverter topology is further proposed to demonstrate the coupling behaviour of the presented ILR unit. The lumped equivalent circuit of the designed ILR-based lowpass filter is derived and simulated. Finally, the proposed microstrip filter is fabricated and measured. A good agreement is found among EM-simulated results, circuit-simulated results and the measured results. Such low-loss, high-performance lowpass filter can be used in surface ship radar and satellite communications.
ISSN:2228-6179
2364-1827
DOI:10.1007/s40998-019-00191-w