- Title
- Stepped impedance key-shaped resonator for bandpass and bandstop filters design
- Creator
- Lek, K. C.; Lum, K. M.
- Relation
- PIERS 2012 Kuala Lumpur: Progress in Electromagnetics Research Symposium. PIERS 2012 Kuala Lumpur: Progress in Electromagnetics Research Symposium: Proceedings (Kuala Lumpur, Malaysia 27-30 March, 2012) p. 588-592
- Relation
- http://piers.org/piersproceedings/piers2012KualalumpurProc.php
- Publisher
- Electromagnetics Academy
- Resource Type
- conference paper
- Date
- 2012
- Description
- In this paper, a bandpass filter (BPF) and bandstop filter (BSF) designs using Key-shaped resonators are presented. The filter designs comprise stepped impedance resonators (SIR) and defective ground structure (DGS). The presence of the DGS creates a coupling capacitor in the ground plane which provides a filtering channel for improving the insertion loss and bandwidth performances. In addition, the DGS leads to reduction of overall circuit size, suppression of harmonic response and high selectivity of the filter response. Conversely, the SIR resonators are laid on the top conductor layer and the structure topology can be varied to obtain the desired performance of the filter. Furthermore, the stopband characteristics can be controlled by arranging the attenuation poles of the passband response. The proposed BPF is fabricated on FR4 substrate having a thickness of 1.6 mm, loss tangent of 0.027 and relative permittivity of 4.7. The best measured S11 response was observed at 2.6 GHz with a value of -20 dB. The corresponding S21 is -4:2 dB, with a stopband attenuation of 21.8 dB/GHz. As an extension of the SIR concept, a BSF is further proposed which consists of an open-ended stepped impedance quarter-wavelength stub. The best measured S11 response was obtained 3.22 GHz with a value of -0:2 dB. The stopband attenuation is 19.4 dB/GHz and the corresponding S21 is -28 dB. The BSF is prototyped using FR4 substrate. The dimensions of both BPF and BSF are 23.5mm by 25.2mm and 25.5mm by 22.5mm respectively. Validation of the BPF design is obtained via good agreement between the simulated and measured results.
- Subject
- stepped impedance; filter designs; bandwidth performance
- Identifier
- http://hdl.handle.net/1959.13/1303024
- Identifier
- uon:20593
- Identifier
- ISBN:9781934142202
- Identifier
- ISSN:1559-9450
- Language
- eng
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