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A novel type klystron using sector-ring multiple beam (SRMB) is analyzed in this paper. The SRMB klystron is improved from the conventional multiple beam klystron (MBK) and annular beam klystron (ABK). It has the advantages of both of the two types. In this paper, the SRMB electron gun was simulated and analyzed using two different software, CST and CHIPIC. This paper gives the design of the SRMB...
Based on single-particle model, the propagation of hollow beam electronics was analyzed by calculating the outer electronic motion equation. In the condition without the magnetic field, the relation of the radial motion depending on beam radius and voltage values was indicated and the physical reason was addressed. In this paper, the motion equation of outer electrons was deviated to explain the influence...
The paper presents a novel cascaded folded waveguide traveling wave tube (FW-TWT) interacting with two beams operating at TE20 mode. This cascaded structure is constructed by two sections. The downstairs section interacts with the two beams to amplify the signal initially. It also provides the upstairs section with small input power. The upstairs section continues to amplifying the signal. Both the...
In this paper, a dielectric loaded grating is proposed to enhance the Smith-Purcell (SP) radiation at terahertz frequencies. By using two-dimensional particleincell (PIC) code, the radiation power of dielectric loaded grating with different currents is simulated. The results show that compared with the metal grating, the dielectric loaded grating can decrease the threshold current and improve the...
A novel type of slow-wave structure for Smith-Purcell device called dielectric loaded metal grating, is proposed in this article. The three-dimensional (3D) analytical theory for the “hot” dispersion relation is derived using the field matched method and the results accord well with the simulation data performed by using 3D particle-in-cell (PIC) code.
Two beams are introduced into the folded waveguide (FW) slow wave structure. The transmission modes in the longitudinal and transverse two-beam FW were compared. The dispersion of longitudinal and transverse two-beam FW was calculated by CST Microwave Studio (MWS). The results of simulation show that the transverse two-beam FW has wider bandwidth than the longitudinal two-beam FW. The S parameter...
In this paper, an equivalent circuit model is adopted to research on the dispersion characteristics of terahertz (THz) two-beam folded waveguide (FW). Firstly, two different equivalent circuit models of beam holes are compared. Secondly, the results from HFSS and CST Microwave Studio (MWS) are compared with above results. Besides, some improvements on the equivalent circuit model are conducted to...
The additive-increase multiplicative-decrease MAC (AIMD-MAC) protocol is a distributed multi-access algorithm proposed in our earlier work and it is controlled by three parameters: the update cycle, the additive increase term and the multiplicative decrease factor. It was designed to exploit the multi-packet reception (MPR) capability in wireless networks. We describe the AIMD-MAC protocol and study...
The increasing demands on wideband satellite services and wider band transponder architecture have imposed research on the full-wave electromagnetic (EM) design of wideband output multiplexer (OMUX) for satellite payload subsystems. In this paper, three common spurious mode effects existed in the design of a waveguide manifold multiplexer, namely cavity higher-order mode resonance, manifold higher-order...
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