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Transient scattering properties of variety dipole antenna in time domain are analyzed using Finite-Difference Time Domain (FDTD) method and PML technology. L-shape, U-shape and Z-shape dipole antenna with open circuit and short circuit feeding are considered respectively. The monostatic scattering pulse waveforms and radiation energy patterns of the antennas are given, when Gaussian pulse is incident...
In this paper, a 3 W high power LED array system with an in-line pin fin heat sink is designed, fabricated, and investigated for thermal transient analysis. Preliminary finite element simulation is conducted by ANSYS, and LED array average junction temperature is about 40.9°C. In the experiment, electrical test method is used to evaluate the heat dissipation effect of the LED array system. Experiment...
Terahertz (THz) technology has recently attracted much attention due to a very broad range of potential applications, such as security and medical imaging, radio astronomy, and ultra-fast electronics for future generation computation and communications. However, the THz field is still largely unexploited due to the bottleneck issue that is the lack of compact, solid-state, room-temperature emitters...
Terahertz (THz) technology has recently attracted much attention due to a very broad range of potential applications, such as security and medical imaging, radio astronomy, and ultra-fast electronics for future generation computation and communications. However, the THz field is still largely unexploited due to the bottleneck issue that is the lack of compact, solid-state, room-temperature emitters...
Radial line helical array antenna is a novel antenna which realizes the directional radiation of circularly polarized high power microwave. This paper put forward a rectangular radial line helical array antenna (subarray), which uses short helical antenna as its radiation element, each helix is excited by the energy coupled by a probe from a radial line waveguide, especially it can be simply assembled...
The High-power radial line helical circular array antenna is a novel antenna developed to realize directional radiation of high-power microwaves. This kind of antenna uses short helical antenna as its radiation element, and uses radial line as its feeding waveguide. New probes that can be fixed directly on the radial waveguide (without the need for medium support) are used to couple energy from the...
Mode matching method is a useful way to analyze the mode characteristics during the section change of the waveguide. By applying this method to the radial waveguide and solving specific problems due to the radial transmission of electromagnetic wave, a calculating method in radial waveguide based on mode matching is presented. The scattering characteristic of metallic plates in radial waveguide is...
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