Abstract
In this paper, a dual-band radiation system for a complex magnetically insulated line oscillator (MILO) is designed and investigated numerically. The radiation system comprises a coaxial plate-inserted mode converter, a power combiner and a conical horn antenna. The mode converter converts the coaxial TEM mode microwaves (1.775 GHz and 3.175 GHz) which are generated by the complex MILO into the coaxial TE11 mode microwaves, and then the coaxial TE11 mode microwaves are combined by the power combiner in a circular waveguide. Lastly, the microwaves are radiated by a conical horn antenna into the air. The gains of the dual-band radiation system are calculated to be 17.8 dB at 1.775 GHz and 18.9 dB at 3.175 GHz. The 3 dB beam widths are 20.5° in E-plane, 26.4° in H-plane at 1.775 GHz and 20.8° in E-plane, 15.1° in H-plane at 3.175 GHz. The power transmission efficiencies of the dual-band radiation system are 98.5% at 1.775 GHz and 95.7% at 3.175 GHz respectively. The power handling capacities of the dual-band radiation system are 4.2 GW at 1.775 GHz and 4.7 GW at 3.175 GHz, respectively.
Highlights
In the past few decades, with the fast development of pulsed power technology and intense electron beam generation from conventional accelerators, the high power microwave (HPM) technology has achieved significant progress
Among so many HPM sources, magnetically insulated transmission line oscillator (MILO) is attracting more attention due to that it has angular guidance field generated by self-load current, which does not require an external magnetic field, it has a simple and light structure, and it is easy to realize compactness for an HPM system
The magnetic insulation current of MILO-1 is used to generate HPM in the MILO-2, and MILO-2 is the load of MILO-1
Summary
In the past few decades, with the fast development of pulsed power technology and intense electron beam generation from conventional accelerators, the high power microwave (HPM) technology has achieved significant progress. If the magnetic insulation current is used to generate another band HPM, a new dual-band HPM source will be formed, and the overall efficiency of the device will be greatly improved. Based on this idea, a novel complex MILO is proposed.[11,12] Fig. 1 shows the model of it. The dual-band microwaves generated by the complex MILO are TEM modes. The dualband radiation system converts the dual TEM modes generated by the complex MILO into TE11. Modes efficiently, combines the dual-band microwaves in a waveguide, and radiates the dual-band microwaves into the air
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