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This paper proposed a novel disc-cone-shaped antenna (NDA) used in a radiating high-power wideband system. The NDA is a kind of wideband biconical antennas and has a number of advantages such as structural simpleness, compactness and efficiency. In the test, when the the NDA was rapidly charged to about 300kV by a Marx generator, it shew an ultra wide-band gain of 0.65. The radiated electric fields...
An optical coupler composed of gold cylinder arrays overlaid with a gold film was proposed for quantum well infrared photo-detector. Finite difference time-domain method was used to numerically investigate the near-field enhancement. The result showed that for the x-polarized light normally incident from the backside, strong electric field component perpendicular to the quantum well can be generated,...
If not well designed, high voltage composite insulators are prone to ageing and failure due to corona and electric field stress. Particular care is required designing areas where the metal end connections meet the insulator core, otherwise a large electric field enhancement is observed. It is difficult to completely eradicate corona on any insulator, thus manufacturers try and minimise this phenomenon...
The use of composite insulators for overhead transmission lines has increased in the past decade. Various designs and models are now available for a wide range of voltages. The 3D Finite Element Analysis electric field distribution of such composite insulators has been of considerable interest due to its differences to ‘conventional’ glass or ceramic insulators. Results of such analysis are now widely...
The dynamic behaviour of water droplets subject to AC electric fields is investigated by experiment and finite element modelling. The motion of a water droplet is considered on the surface of a metallic sphere. To understand the consequences of vibration, the FEA model is introduced to study the dynamics of a single droplet in terms of phase shift between vibration and exciting voltage. Moreover,...
The surface potential gradient is a critical design parameter for planning overhead lines, as it determines the level of corona loss (CL), radio interference (RI), and audible noise (AN). The majority of existing models for surface gradient calculation are based on analytical methods which restrict their application in simulating complex surface geometry. This article proposes a novel method which...
A new high voltage buried P+ layer membrane SOI (BP+M SOI) is proposed. Its Breakdown voltage (BV) is only decided by lateral breakdown voltage like Camsemi SOI. Introducing of P+ layer can effectively reduce specific on-resistance and alleviate self-heating effect (SHE). The electric characterizations are researched for the new structure by using 2D MEDICI software. The simulation results show that...
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