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Design of Band-Notched UWB BPF with Very Wide Upper Stopband Using Combined λ/4 TSSIR.
- Source :
-
Journal of Electromagnetic Waves & Applications . Feb2009, Vol. 23 Issue 2/3, p183-194. 12p. 1 Black and White Photograph, 3 Diagrams, 4 Graphs. - Publication Year :
- 2009
-
Abstract
- In this paper, a new band-notched UWB BPF with a very wide upper stopband is designed using a λ/4-type multi-mode resonator (MMR). The proposed MMR, being formed by combining two identical λ/4 tri-section stepped-impedance resonators (TSSIRs) in a structure-shared fashion, exhibits both λ/4 and embedded λ/2 types of resonance with a relatively smaller circuit size. By properly locating the first four resonant modes of the MMR and the coupling peaks of the input/output parallel-coupled lines, a five-transmission-pole UWB BPF is realized with a favorable uniform in-band UWB response. Besides the good UWB performance, a 5-GHz notched band is created by embedding in the output feed line a T-shape lumped-element bandstop structure to reject the influence from WLAN signals. Also, a very wide upper stopband is achieved by implementing a compact bandstop filter structure in the input feed line together with the properly located transmission zeros generated by the input/output interdigital-coupled lines and the second harmonic of the T-shape bandstop structure. A prototype of the proposed UWB BPF was fabricated and measured for performance verification. The measured results show a return loss of higher than 10 dB, a minimum insertion loss of 0.41 dB, and a group delay variation of less than 0.11 ns in the UWB passband except the notch. The notched band has a 3-dB bandwidth of 18%. The measured upper-end –20-dB stopband ranges from 11.94 to 30.56 GHz, with a bandwidth of 18.62 GHz. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09205071
- Volume :
- 23
- Issue :
- 2/3
- Database :
- Academic Search Index
- Journal :
- Journal of Electromagnetic Waves & Applications
- Publication Type :
- Academic Journal
- Accession number :
- 36820978
- Full Text :
- https://doi.org/10.1163/156939309787604463