Yu-Fu Chen and  Zih-Jyun Dai and  Chen-Te Chiu and  Shiue-Chen Chiou and  Yung-Wei Chen and  Yu-Ming Lin and  Kuan-Yu Chen and  Hung-Wei Wu and  Hsin-Ying Lee and  Yan-Kuin Su and  Shoou-Jinn Chang,  Compact Dual-Band Bandpass Filter Based on Quarter Wavelength Stepped Impedance Resonators.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 112(4). 517 - 520
    [viewed 29 May 2020]. Available from: https://publications.waset.org/pdf/10004208.