Compact Dual-Band Bandpass Filter Based on Quarter Wavelength Stepped Impedance Resonators

Year: 2016 Volume: 10 Issue: 4 517 - 520 Pages

• Authors:
• Yu-Fu Chen
• Zih-Jyun Dai
• Chen-Te Chiu
• Shiue-Chen Chiou
• Yung-Wei Chen
• Yu-Ming Lin
• Kuan-Yu Chen
• Hung-Wei Wu
• Hsin-Ying Lee
• Yan-Kuin Su
• Shoou-Jinn Chang

Abstract: This paper presents a compact dual-band bandpass filter that involves using the quarter wavelength stepped impedance resonators (SIRs) for achieving simultaneously compact circuit size and good dual-band performance. The filter is designed at 2.4 / 3.5 GHz and constructed by two pairs of quarter wavelength SIRs and source-load lines. By properly tuning the impedance ratio, length ratio and radius of via hole of the SIRs, dual-passbands performance can be easily determined. To improve the passband selectivity, the use of source-load lines is to increase coupling energy between the resonators. The filter is showing simple configuration, effective design method and small circuit size. The measured results are in good agreement with the simulation results.

• Keywords:
• Dual-band
• bandpass filter
• stepped impedance resonators
• SIR.

New Triangle-Ring UWB Bandpass Filter with Sharp Roll-Off and Dual Notched Bands

Year: 2012 Volume: 6 Issue: 5 499 - 502 Pages

• Authors:
• Hung-Wei Wu
• Yung-Wei Chen
• Yu-Fu Chen
• Cheng-Yuan Hung

Abstract: This paper presents a new ultra-wideband (UWB) bandpass filter (BPF) with sharp roll-off and dual-notched bands. The filter consists of a triangle ring multi-mode resonator (MMR) with the stub-loaded resonator (SLR) for controlling the two transmission zeros at 2.8 / 11 GHz, the embedded open-circuited stub and the asymmetric tight coupled input/output (I/O) lines for introducing the dual notched bands at 5.2 / 6.8 GHz. The attenuation slope in the lower and higher passband edges of the proposed filter show 160- and 153-dB/GHz, respectively. This study mainly provides a simple method to design a UWB bandpass filter with high passband selectivity and dual-notched bands for satisfying the Federal Communications Commission (FCC-defined) indoor UWB specification

• Keywords:
• steeply slopes transition band
• bandpass filter
• ultra-wideband (UWB)
• triangle-ring
• multi-mode resonator
• stub-loaded resonator.