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The high frequency characteristics have been researched on overmoded traveling-wave tube (TWT) at W-band. A new slow-wave structure (SWS) is presented. The high frequency parameters including dispersion, interaction impedance, and cold loss are calculated using the 3-D full wave simulation tool CST MWS. The new structure is working at the fourth mode with the frequency of 100.5 GHz. The cross-section...
In this paper, the TWT nonlinear equations are newly derived by considering the higher harmonics. The nonlinear process is also simulated by the Russian simulation code TWTSNU. Compared with the simulations, the derivations of this paper have the discrepancy of about 2%, while the old equations of about 10%. Also, it can be clearly seen from this paper that the output power of fundamental harmonic...
The electrical and thermal characteristics have been researched on overmoded traveling-wave tube (TWT) at W-band. A new slow-wave structure (SWS) is presented. The beam-wave interaction is calculated using the 1-D large signal simulation tool TWTSNU. The results show the new structure is working at the fourth mode with the average output power 1.25 kW, electronic efficiency 17.8%, and stable thermal...
This paper describes the investigation of broadband interaction and harmonic suppression. A special dispersion shape used in broadband traveling-wave tubes (TWT) is obtained. The and simulation studies of negative dispersion are presented. On the basis of these studies, a broadband TWT used in microwave power module (MPM) is designed. Compared with the old TWT with flat dispersion, the new one with...
An ultralow-profile antenna based on a typical magnetic metamaterial unit cell, i.e., complementary electric resonator (CELC) structure, is introduced in this paper. The antenna behaves with an attractive performance of operating in induced “TM120 mode” as the fundamental resonance mode, which is much lower than TM100 mode. Compared to the reported miniature microstrip antennas based on slotting patch/ground...
Dispersion characteristics and interaction impedance is the key parameter for travelling wave tube design. This paper demonstrate the travelling wave tube method for dispersion test. A helix slow wave structure was chosen as sample for test validation. Also, the test results are compared with the simulations of CST Microwave Studio (MWS) and High Frequency Structure Simulator (HFSS). Test results...
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