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Based on the theory of Bethe hole coupling, a broadband directional coupler is designed by combining the attenuation factor of coupled waves and the field averaging correction factor. A 3dB directional coupler at Ka-band is designed in this paper. First, according to the required specification, the relevant parameters of equally spaced waveguide directional coupler are preliminarily designed based...
This paper proposes a novel resonator to achieve miniaturization of combline filter. The proposed resonator is similar to helical resonator. To demonstrate the validity of the proposed resonator, a pass-band filter with a center frequency of 160MHz and a relative bandwidth of 50% is presented. Simulation results show that this new design can reduce the dimensions by 25% compared with the conventional...
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