Publication: Robust tolerance design of bandpass filter with improved frequency response for Q-band satellite applications
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AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/TEC2017-85529-C3-2-R/ES/
Abstract
A rectangular waveguide bandpass filter for Q-band with simple fabrication is proposed in this letter. The design is based on the use of the first passband replica of commensurate-line stepped-impedance structures and achieves the suppression of their inherent low-pass response. In order to do it, the filter is implemented by rectangular waveguide sections with different widths and heights that can be analytically calculated. The technique is validated by a 9th order Chebyshev filter with passband between 40 and 43 GHz and fabrication yield equal to 84 % for a manufacturing error of ± 20 μm. The measured results of the prototype fabricated with CNC milling are in good agreement with the simulated ones.
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