Abstract
The tunable high power microwave source (HPM’s) is considered to be an important research direction. However, the corresponding mode converter has been researched little. In this paper, a high-efficiency tunable mode converter (HETMC) is investigated for high-power microwave applications. The HETMC that is consisted of coaxial inner and outer conductors, with four metal plates arranged radially, at 90° in the coaxial gap, and matching rods can transform coaxial transverse electromagnetic (TEM) mode to TE11 coaxial waveguide mode. The results show that adjusting the length of the downstream plate, and the distance between the rods installed upstream and the closest edges of the plates, can improve the conversion efficiency and bandwidth remarkably. Moreover, when the frequency ranges from 1.63 GHz to 2.12 GHz, the conversion efficiency is above 95% between 1.63 GHz and 2.12 GHz with a bandwidth of 26.1%. Besides, the unwished reflection and transmission can be eliminated effectively in the HETMC.
Highlights
Many high power microwave (HPM) devices such as virtual cathode oscillator (VCO),[1,2] relativistic magnetron (RM)[3,4,5,6,7] and the magnetically insulated transmission line oscillator (MILO),[8,9,10] can generate symmetric azimuthally output modes including TM01 circular waveguide mode and coaxial transverse electromagnetic (TEM) mode
It is found that the tunable MILO can generate HPM with 3.0 GW and 1.51 GHz
The schematic diagram of the tunable HPM system is illustrated in Fig. 1, which consists of the tunable MILO, the high-efficiency tunable mode converter (HETMC) and the antenna
Summary
Many high power microwave (HPM) devices such as virtual cathode oscillator (VCO),[1,2] relativistic magnetron (RM)[3,4,5,6,7] and the magnetically insulated transmission line oscillator (MILO),[8,9,10] can generate symmetric azimuthally output modes including TM01 circular waveguide mode and coaxial transverse electromagnetic (TEM) mode. Both modes will be consequentially transformed either to TE11 circular waveguide or to TE11 coaxial waveguide in order to get directed radiation.
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