Abstract
A new class of miniaturized dual-mode substrate inte- grated waveguide (SIW) band-pass fllters is proposed, which are loaded by double/single T-shaped structures. By introducing a double T- shaped structure in original dual-mode SIW band-pass fllter, the reso- nant frequency is lowered from 9.46GHz to 8.91GHz due to the longer efiective length. The introduced single T-shaped structure performs an even lower resonant frequency of 6.88GHz for the same reason. Compared with dual-mode band-pass fllters in references, the proposed dual-mode SIW band-pass fllters with double/single T-shaped struc- tures have the advantages such as compact size (like microstrip dual- mode fllters) and high Q factors (like SIW dual-mode fllters). The proposed fllters are fabricated and measured, and the experimental results are in good agreement with simulated ones.
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