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In this letter, we propose a practical three-section dual-band transformer, which can terminate frequency-dependent complex load impedance at two arbitrary bands simultaneously. Analytical equations are derived to achieve the exact closed-form solutions. Numerical examples are examined to verify the validity. This three-section transformer can be utilized to match the complex load impedance with unequal...
Neural network techniques have been widely applied to areas of such as data mining, information integration and grid computing. This paper proposes a new learning algorithm based on trust region optimization theory. In the paper, the Dogleg-algorithm to obtain the valid trust region steps is presented, and a self-adjustable method with variable coefficients is given to resolve the problem of oscillatory...
Cognitive Radio (CR) is an attractive technology to alleviate spectrum scarcity in wireless communications. It allows secondary users (SUs) to opportunistically access the licensed spectrum of primary users (PUs) so long as these users' communications are protected. Therefore, protection of the PUs is central to the adoption of this technology. In this paper, we consider an SU that must protect multiple...
In order to calculate the overvoltage of transformer windings under the very fast transient overvoltages (VFTOs) more efficiently, a fast time-domain algorithm is presented based on the compact finite difference (CFD) and the backward differentiation formulas (BDF) in this paper, in which a hybrid model is used consisting of multi-conductor transmission-line (MTL) and equivalent frequency-dependent...
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