Abstract
A novel band-pass MIM waveguide filter based on dual-coupler is proposed and investigated. The theoretical model of electric field transmission is established and the filtering characteristics are studied. The results show that the band-pass filtering is realized via constructive interference when the length of the cavity-like structure is equal to an integer multiple of the SPP wavelength. Although the maximum transmissivity decreases gradually as the proportion of SPP power entering into the annular waveguide increases, the 3 dB bandwidth of the filter is narrowed. By changing the structural parameters, the filtering wavelength, transmissivity, and filtering bandwidth can be effectively designed.
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