An Effective Approach to Suppressing the Spurious Mode in Rectangular Waveguide Filters

In this letter, a new method for rectangular waveguides bandpass filters with improved stopband performance is presented. By setting the position of the coupling window, the coupling of the high-order mode can be attenuated, which makes it difficult to form parasitic passbands. It can significantly...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 29; no. 11; pp. 703 - 705
Main Authors Wu, Q., Zhu, F., Yang, Y., Shi, X.
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2019
Subjects
Couplings
High-order mode suppression
Microwave filters
Passband
Rectangular waveguides
Resonant frequency
stopband improvement of filters
Time-frequency analysis
waveguide filters
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Summary:In this letter, a new method for rectangular waveguides bandpass filters with improved stopband performance is presented. By setting the position of the coupling window, the coupling of the high-order mode can be attenuated, which makes it difficult to form parasitic passbands. It can significantly improve the stopband rejection of the filter without introducing additional elements. Furthermore, the whole structure can be fabricated using the conventional computer numerical control (CNC) milling technology. A Ka -band waveguide filter is designed and tested. The stopband rejection of the design is increased from 1.4 times to 1.94 times the center frequency of the filter with the insertion loss of 0.5 dB. Finally, the measurement results validated the proposed design.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2019.2939887