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Transformer-based series power combiners are analyzed within the context of reconfigurable, watt-level, wideband digital envelope tracking transmitters. A model is developed for designing and analyzing transformer-based switchable series combiners. This model takes into account losses in the windings and nonideal mutual coupling, as well as the effect of switching and scaling the input amplifiers...
A compact tunable internal antenna using a composite right/left handed transmission line (CRLH-TL) for personal communication handset application is presented in this paper. The antenna consists of two lumped inductors, and a variable capacitor to adjust the resonant frequency by controlling the DC bias voltage. Simulation results show that the required frequency can be tuned nearly from 1.8GHz to...
In this paper, wideband LC balun using coupled LC resonator has been designed, simulated and fabricated for being embedded into an organic packaging substrate. The proposed balun has a novel scheme which consists of two pair of coupled embedded LC resonators which share one resonator with each other. The coupled resonators are applied to obtain a precise phase difference of 180 degree and an identical...
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