A Compact Microstrip Lowpass Filter with Ultra-Wide Rejection Band and Sharp Transition Band Utilizing Combined Resonators with Triangular Patches
Loading...
Date
2018-06
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Společnost pro radioelektronické inženýrství
Altmetrics
Abstract
In this paper, a microstrip lowpass filter with -3 dB cut-off frequency of 1.8 GHz consisting of two resonators with different triangular patches and four high-low impedance resonators as suppressing cells has been designed. To design this filter, the influence of each transmission line on the frequency response of the utilized resonators has been clarified by calculating the equations of S21 and S11 based on the lumped circuit of them separately. The designed filter has been constructed and tested, and an good agreement between the simulation and measurement results has been achieved. The stopband covers an ultra-wide frequency range from 1.94 to 34.556 GHz with a suppression level of -21.2 dB. Furthermore, the insertion loss in the passband region is close to zero from DC to 1.68 GHz and an acceptable return loss (17.44 dB) in this band can prove desired in-band character. Moreover, the proposed filter provides a sharp transition band equal to 228 (dB/GHz). The designed lowpass filter has a high figure of merit equal to 26583.4.
Description
Citation
Radioengineering. 2018 vol. 27, č. 2, s. 417-424. ISSN 1210-2512
https://www.radioeng.cz/fulltexts/2018/18_02_0417_0424.pdf
https://www.radioeng.cz/fulltexts/2018/18_02_0417_0424.pdf
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en