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A novel frequency diplexer was proposed in this paper, based on the integration of a SIW- CSRR bandpass filter and SIW highpass filter. SIW has the highpass characteristic as RW; CSRR is the image of SRR and takes some metamaterial features. A SIW-CSRR bandpass filter is firstly designed, and then a simple SIW highpass filter. The combination of these two filters thus leads to a simple and compact...
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