Muhammad Haitham Albahnassi and  Adnan Malki and  Shokri Almekdad,  Improving the Frequency Response of a Circular Dual-Mode Resonator with a Reconfigurable Bandwidth.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2020, vol. 159(3). 59 - 62
    [viewed 07 May 2024]. Available from: https://publications.waset.org/pdf/10011105.