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In this paper, multisine excitation signals are used to extend the reading range of commercial RFID readers. To do so, a commercial reader is equipped with an external multisine front-end that implements previous mathematical proposals. A reading range improvement is achieved when compared with conventional single carrier approaches, even with the same average power being transmitted. A reading range...
A pentagonal patch-excited sectorized antenna (SA) suitable for 2.4–2.5 GHz localization systems was studied and developed. The integration of six patch-excited structures converges into a sectorized antenna called Hive5 that provides gain improvement compared to a patch antenna, maximum variation of 3 dB beam width over the radiation pattern and circular polarization (CP). This antenna is presented...
This paper presents an approach to signal excitation specially designed to improve the DC power obtained in a RF to DC converter and consequently its RF-DC efficiency conversion. In this sense a multisine signal is used as the excitation, and it is proved either theoretically, by simulations and by measurements, that a multisine signal with 0° phase relationship between the tones can give better DC...
This paper presents a new time-frequency characterization method for extracting the linear and third-order nonlinear parameters of a PA including long term memory. A dynamic frequency two-tone test signal is developed where the frequency separation between tones increases over time to enable third-order measurements over frequency from a single measurement. A measurement technique is presented using...
This paper presents a new type of analog-digital mixed-domain instrument that is specially tailored for software-defined-radio characterization. The instrument allows the utilization of analog instruments such as vector signal analyzers and network analyzers to characterize components based in the digital domain, such as analog-to-digital converters or field-programmable gate arrays. In this paper...
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