Zhaoming Feng, Xiaojun Bi 0003, Zilan Cao, Andy Shen, Qichao Ding, Qinfen Xu. A Filtering Balun Utilizing Multi-Ring Loaded Vertical Transition Structure With 161% Fractional Bandwidth and >5.8f₀ Stopband. IEEE Trans. Circuits Syst. II Express Briefs, 69(4):2061-2065, 2022. [doi]
Abstract is missing.