Abstract
A Ku-band (12–18 GHz) waveguide bandpass filter has been designed, fabricated using stereolithography (SLA) printing, measured, and presented. The filter is composed of five coupled TE101 resonators, where the external/internal couplings are implemented through the rotation of resonators. This novel filter structure is superior to conventional filters based on irises, in terms of reduced sensitivity to fabrication inaccuracies (i.e., allowing larger tolerance in the fabrication process), as the coupling strength depends on the mutual rotation angle between resonators and input/output waveguides. This simple inline filter structure also allows the generation of transmission zero (TZ), by altering the rotation angles of resonators. A Ku-band prototype filter, with a center frequency of 14 GHz, a bandwidth of 0.8 GHz, a return loss of 20 dB, and a TZ at 14.8 GHz, has been successfully demonstrated, and this verifies the proposed concept.
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