Miniaturized Dual-Band Bandpass Filter Using T-Shaped Line Based on Stepped Impedance Resonator with Meander Line and Folded Structure
- Authors
- Lee, Tae-Hyeon; Yoon, Ki-Cheol; Kim, Kwang Gi
- Issue Date
- Jan-2022
- Publisher
- MDPI
- Keywords
- Dual-band filter; Folded structure; Meander line; Stepped impedance resonator; T-shaped line
- Citation
- Electronics, v.11, no.2
- Journal Title
- Electronics
- Volume
- 11
- Number
- 2
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83383
- DOI
- 10.3390/electronics11020219
- ISSN
- 2079-9292
- Abstract
- A stepped impedance resonator (SIR) is suitable for designing a dual-band bandpass filter (BPF) that can be adjusted to reject spurious bands. A BPF is proposed using an SIR T-shaped meander line and folded structure. The BPF mainly comprises a meander line, a folded structure, and a T-shaped line. A novel BPF is used for the T-shaped line, which operates as a band-stop filter connecting to the center of the BPF. As a result, the complete BPF enables dual-band operation. The insertion and return losses of the first frequency passband (f01) are 0.024 and 17.3 dB, respectively, with a bandwidth of 46% at a center frequency of 2.801 GHz (2.2–3.48 GHz). The insertion and return losses of the second frequency passband (f02) are 0.026 and 17.2 dB, respectively, with a bandwidth of 10% at a center frequency of 4.351 GHz (4.13–4.55 GHz). The proposed BPF provides low loss, a simple structure, and a small size of only 4.29 × 4.08 mm, and it can be integrated into mobile communications systems. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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