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Multiband bandpass filter (BPF) design is proposed by utilizing E‐plane septa to introduce transmission zeros in‐band for waveguide application. Due to the unique employment of E‐plane septa, multiband BPF responses are flexible to realize. Since number of transmission zeros is strongly dependent on the structure of employed septa, by adjusting the parameters of septa, dual‐band, tri‐band, and quad‐band,...
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