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A Varactor-Based Very Compact Tunable Filter with Wide Tuning Range for 4G and Sub-6 GHz 5G Communications. - Yasir Al-Yasir; Naser Ojaroudi Parchin; Yuxiang Tu; Ahmed Maan Abdulkhaleq; Issa T. E. Elfergani; Jonathan Rodriguez 001; Raed A. Abd-Alhameed (Sensors, 2020)