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In this paper, microwave breakdown is analyzed in arbitrarily-shaped waveguide with the help of the Spectral Element Method (SEM). Both the electromagnetic fields distributed in the structure and the free electron continuity equation are solved by the SEM. Based on such a highly accurate numerical method, both tail-erosion phenomenon in time domain and bandwidth broaden in frequency domain caused...
In this paper, a new category of waveguide E-plane filters is summarized. This kind of filters use the planar stripline as the resonating element. This kind of filters using split-block substrate insert E-plane technology can achieve very compact filtering structure at millimeter-wave with very low fabrication cost. Four different waveguide E-plane filters are presented.
A microstrip triple band filter using dissimilar quarter-wavelength stepped impedance resonator (SIR) with a source-load coupling feedlines structure is proposed in this paper. Multiple transmission zeros are generated by using source-load coupling structure. Then, multipath coupling diagrams are constructed and the relative phase shifts of each path are studied to explain the responses of the triple-band...
A novel nonreciprocal bandstop filter (NBF) using metamaterial Thue-Morse multiferroic superlattices (MTMMS) is presented, where the multiferroic domains with polarization and magnetization simultaneous are arranged along x-axis according to the iterative rule of the Thue-Morse sequence. The dispersion relation is obtained by the transfer matrix method and indicates that the band gaps for the forward...
This paper investigates and compares the via-coupling and gap-coupling mechanisms in end-coupled structures, in which the former is realized by the shared metallic via between two resonators. Comparisons show that the via-coupling provides more design flexibility, owns better tolerance to fabrication errors and requires more ordinary substrate than the traditional gap-coupling. These merits have been...
In this letter, a low phase-noise microwave oscillator based on a narrowband symmetric structure filter using coupled transmission lines is proposed. The novel structure for a narrowband filter is characterized with a low phase noise due to the good quality factor on transmission zero. An oscillator based on the filter was designed, fabricated and measured. At the oscillation frequency of 1.92 GHz,...
In this paper, a compact third-order balanced filter with quasi-elliptic function response is synthesized based on mixed electric and magnetic(EM) coupled stepped-impedance resonators(SIRs). The filter has enhanced differential-mode(DM) transmission response since two DM transmission zeros(TZs) are generated on both sides of the passband. Existence of these two TZs is investigated by the mixed EM...
A triple-mode wideband bandpass filter (BPF) is proposed in this paper. Three resonant modes, namely, TM01 mode and A pair of TE11 degenerated modes, have been excited in single rectangular waveguide cavity. Meanwhile, a wide pass bandwidth have been realized and the fractional frequency bandwidth of about 29% is achieved at the central frequency of 3.1 GHz. Finally, a filter sample is fabricated...
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