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3. A highly selective balanced wideband bandpass filter based on nested split‐ring resonators;Xu L;Int J RF Microw Comput Aided Eng,2019
4. A novel wideband bandpass filter based on CSRR‐loaded substrate integrated folded waveguide;Yang L;Int J RF Microw Comput Aided Eng,2020
5. Compact wideband filtering microstrip crossover with separated operating frequencies