The distribution cable may be considered the most critical element for power system operation through the key functions of electricity supplement and control and instrumentation signal transmission. Hence, there is a growing need for cable diagnostic techniques that enable accurate condition monitoring and fault detection in cables where external artifact signals are to be continuously measured. This research presents a technique for detecting cable faults based on autoencoder regression-based reflectometry with multiple frequency sinusoidal signals. Estimations of the reflected signal and preliminary test results of a non-faulty cable are used to train the time-series signal reconstruction and anomaly detection, allowing the distinguishment between a fault-induced reflected signal and various artifacts resulting from noise, input mismatch, or other factors. Experiment results on fault location in bypass cable and the reflected signal discrimination on branched network cable have validated the usefulness of the proposed algorithm.

In the current study, a coupled line coupler with smooth passband based on two-layer structure is proposed. By using second dielectric material slab, the smoothness of coupled line coupler can be refined under the same area of microstrip circuits. The 1dB-fluctuation passband of this coupler is from 12.6GHz to 13.4GHz with maximum S₃₁ of -8.23dB at center frequency of 13GHz whose variance D is 0.069. The applying of second dielectric material slab restructures the coupling length of electrical and magnetic field leading to the refinement of passband. This method is based on the change of wavelength of signal, which means the changing of passband is more obvious in higher operating frequency under a certain variation of wavelength. The second dielectric material slab shall be placed on an accurate position to achieve best smoothness which needed to be well calculated and simulated.

A novel Snapback-free RC-LIGBT with Separated LIGBT for forward conduction and anti-parallel FWD (SLF) for the reverse conduction, named SLF LIGBT is proposed and investigated. The SLF features independent LIGBT with N-pillar drift and FWD with P-pillar drift of the Superjunction, which is dielectric isolated by the sio₂, thus the carrier conduction region of the drift is divided into top and bottom two layers. The results show that the snapback is completely eliminated for the proposed SLF-LIGBT, and the excellent forward conduction V_ON and reverse conduction V_R are achieved.

This letter presents a compact reconfigurable feeding network, which can provide four polarizations. The feeding network includes a branch-line hybrid, two p-i-n diodes, and two grounded capacitors. By manipulating the on/off states of the two diodes, the capacitor can be selectively integrated into the hybrid circuit. Hence, the power distribution of the output ports is changed. The feeding network operating in state I provides a pair of orthogonal linear polarizations (LPs) when both diodes are turned off. The feeding network operating in state II provides a pair of orthogonal circular polarizations (CPs) when both diodes are turned on. Experimental results show that the proposed feeding network has a wide operating bandwidth from 3400 to 3800MHz with S₁₁≤-20dB and isolation level >20dB in two states. Moreover, the amplitude imbalance of the output ports is less than 1.3dB with a 90^° stable phase difference when the feeding network operates in state II. The presented reconfigurable feeding network is suitable for fifth-generation (5G) quadri-polarization antennas.

In this paper, the impact of ground solder ball failure in ball grid array (BGA) package on near electric field radiation was investigated from the perspectives of both theoretical modelling and experimental testing. Based on the structural and material parameters, a 3D electromagnetic field numerical calculation model of circuit boards with failed ground solder balls was developed. The influences of both different number of failed ground solder balls and different signal frequencies on near electric field radiation was calculated. The electromagnetic field model results are validated using experimental tests.

This paper proposes an improved current decoupling method (ICDM) combined with forgetting factor recursive least square (FFRLS) of interior permanent magnet synchronous machine (IPMSM). The framework of the proposed model includes the complex vector decoupling module and the approximate voltage compensation module. The strategy of complex vector decoupling is extended to IPMSM, and the parameters setting of current loops is more flexible. Considering the inaccuracy of resistance measurement and parameter variation with temperature, FFRLS model is applied to update the voltage compensation online. The experiments results demonstrated that better dynamic response performance could be achieved using the proposed control method.