Study On THz High Frequency Structure With Double Channels

Frequency range and wavelengths of THz(terahertz) waves is O.1THz-10THz and 30um-3mm, respectively. Recently, terahertz science and technology has become one of the most attractive and promising topics in the scientific community, because of potential applications include high data rate communications, concealed weapon or threat detection, remote high resolution imaging, chemical spectroscopy, materials research, deep space research and communications, basic biological ectroscopy and biomedical diagnostics.The lack of convenient and inexpensive power amplifier has limited developments in THz applications. Vacuum electronic devices(VEDs) are intrinsically superior at handling high power or high average power density. The scaling of vacuum electron devices to create micro vacuum electron devices (μVEDs) is a promising approach towards compact, efficient, powerful amplifier in the sub-terahertz to terahertz (THz) regime, which permits the fabrication and on-chip integration of μVED circuit elements based on photolithography and chemical etching.Based on the new rectangular slow wave structure, a novel of slow wave structure with dual-gratings in parallel based on staggered double channels is proposed. The structure formed by double beams and a focusing system has two-dimensional structure. Dispersion characteristics of slow-wave structure was simulated and analyzed in detail. The high frequency structure is consisted of power dividers and transmissions, and its output ports are standard wave-guide named WR-2.8. The transmission losses of the whole RF structure S21>-4.4dB and the reflection.The beam-wave interaction property of single channel and double channels was also simulated, and its gain can reach 12.13dB with 53.57A/cm2. Because of lower current density and simple structure, the RF system shows the application potential for terahertz TWT.