Yang Q, Liu S, Xu K-D, Zhang A. Compact Octa-band Bandpass Filter based on Controllable Transmission Zeros with Wide Upper Stopband. ACES Journal [Internet]. 2021 Nov. 6 [cited 2024 Jul. 14];36(09):1159-63. Available from: https://journals.riverpublishers.com/index.php/ACES/article/view/12129