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A novel hybrid bandpass filter based on coaxial resonator and evanescent mode waveguide(EMW) with loaded posts is presented. The coaxial resonators are directly coupled to the EMW with posts through air windows. The fundamental TEM mode of the coaxial resonator and the evanescent mode of the EMW constructing the passband of the filter, while the staggered spurious modes of the coaxial rsonator and...
The basic perturbation theory is discussed in this paper to excite a dual mode rectangular resonator cavity. A two order dual mode filter is designed with the center frequency at 35 GHz. An I/O coupling structure is proposed to improve the skirt performance of the filter. Using the I/O coupling greatly increase the out-of-band rejection by introducing transmission zeros on each side of the passband...
A novel structure of coaxial cavity filter is proposed, which is characterized by using mixed-cavities, improved performance, and good tunability. Mixed-cavities mean that the geometry shape of the cavities is different or the type of the resonators is different. In this paper, a high power bandpass filter with two transmission zeros based this new structure with different geometry shapes has been...
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