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The RF front-end complexity in 4G multimode multiband cellular radios has increased dramatically, requiring integration of PAs, filters and switches in a single module to reduce the RF footprint. This paper presents a fully integrated multimode TDD transmit front-end module (TXM) supporting GSM/EDGE/TD-SCDMA/TD-LTE in multiple bands. The TXM is implemented with three die on a 2-layer laminate LGA...
Vibration-based electromagnetic power generators are a green power technology that can solve the power supply problems of distributed sensors and wireless communication systems existing in vibrational environments. A 2 DOF model with nonlinear and non-autonomous characteristics is developed as the system model of vibration-based power generators. The magnetic field is calculated using the finite-element...
The flashover process during ice-melting period of polluted and ice-covered insulator string was studied by experiment in this paper. Arc development, evolution of leakage current and its frequency representation (FFT) were analyzed. The results indicated that the flashover process can be divided into five stages, named initial stage, intermittence local arc stage, arc propagation stage, critical...
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