Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6879471 | AEU - International Journal of Electronics and Communications | 2018 | 18 Pages |
Abstract
In this paper, two compact tuneable bandpass filters (BPFs) based on the coupled feed lines are introduced. To approach a compact size, the coupled feed lines are bended. To design a high performance single-band bandpass filter (BPF), coupled feed lines are loaded by T-shaped stubs (as main resonators) and rectangular stubs (as suppressor stubs). Also, the mechanism of coupled feed lines combining with T-shaped open stubs is analyzed to show a tunable passband. The dual-band BPF includes two big radial-stubs, two small radial-stubs, two T-shaped structures and spiral coupled feed lines. The LC model of big radial-stubs is analyzed to compute the equation of transmission zero using its transfer function. The passband frequency of single-band BPF resonates at 2.12â¯GHz (3G) with corresponded insertion loss of 0.83â¯dB. Also, for dual-band BPF, the measured insertion-losses of first and second passbands are close to 0.8 and 1.1â¯dB, respectively. The frequency responses of BPFs are easily adjusted by altering the physical dimensions, demonstrating a adjustable performance. To verify the correct operation of circuits, the proffered filters are implemented and tested.
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Computer Networks and Communications
Authors
Amirhossein Ghaderi, Alireza Golestanifar, Farzin Shama,