1,721,010 research outputs found
RF Energy Harvesting Using Mobile Phone Base Station Signals
No full textThe fundamental goal of energy harvesting systems is to reduce the need for a wired power supply or battery replacements. Until a few years ago, in integrated electronic systems, detection and communication functions were remarkable challenges with regard to their power supply. There have been advances in the reduction of energy consumption and in battery technology; however, there was always the problem of a wired connection or some battery to replace. This work is aimed to acquire knowledge of RF-DC conversion systems working with mobile phone base station signals; in particular, frequency bands around 806 MHz are considered. The study is carried out, firstly designing and realizing an RF-DC conversion circuit and then measuring the voltage levels obtained from the implemented circuit, at the selected frequency. Ambient radio frequency sources are considered thus, for the circuit design, low power levels around -20 dBm are assumed
A double frequency 180° lumped-element hybrid
No full textIn this letter design formulas for the development of an unusual 180° hybrid working at two distinct frequencies are provided. In particular, the design formulas of a lumped-element rat race are considered
A Dual-Band MMIC Low frequency 180 ° Hybrid
Full text linkIn this paper design formulas,for the development of an unusual 180 ° hybrid working in two distinct frequency bands,are provided.In particular the design formulas of a lumped-element rat race,starting from a conventional transmission-line rat-race,are found out.In order to generalize the matching problem the input and output port impedances are considered to be different
Effective general purpose nonlinear circuit simulator with frequency domain spectral balance method
No full textNew design approach for concurrent dual-band low noise amplifier
No full textThis paper presents a class of lumped element networks, which permit to synthesize impedance values at two frequencies. For each network, in order to infer the related synthesis formulae, mathematical expressions are provided, and for some topologies, the necessary feasibility conditions are defined. Moreover, to stress the usefulness of the presented topologies, a dual-band low noise amplifier is designed utilizing such networks, and the resulting amplifier performances are reported and compare
Matching network design criteria for wideband high frequency amplifier
No full textA powerful design approach for broadband high frequency amplifier has been developed. In particular, the new matching network here presented, based on an extension of the dual frequency transformer, allows to get over the inherent restriction of previously proposed structures. Design relationships are provided and discussed through numerical example. Finally, the proposed structure has been successfully applied to the design of a Ka-band (26-40 GHz) linear amplifier with a minimum return loss of 18dB
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