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Front-end HPA/antenna for multi-radio

Published online by Cambridge University Press:  01 May 2012

Antoine M. Diet ,
Nicolas Ribière-Tharaud ,
Martine Villegas  and
Geneviève Baudoin
Antoine M. Diet*
Affiliation:
UMR 8506, Département de Recherche en Électromagnétisme (DRÉ), Laboratoire des Signaux et Systèmes (L2S), Supélec, plateau du Moulon, F-91192 Gif S/Yvette, France. Phone: +33 169851560
Nicolas Ribière-Tharaud
Affiliation:
CEA, DAM, GRAMAT, F-46500 Gramat, France
Martine Villegas
Affiliation:
Université Paris-Est, Equipe SYstèmes de COmmunication et Micro-systèmes ESYCOM, EA 2552, Groupe ESIEE, BP 99, Noisy-Le-Grand 93162, Cedex, France
Geneviève Baudoin
Affiliation:
Université Paris-Est, Equipe SYstèmes de COmmunication et Micro-systèmes ESYCOM, EA 2552, Groupe ESIEE, BP 99, Noisy-Le-Grand 93162, Cedex, France
*
Corresponding author: A. Diet Email: antoine.diet@lss.supelec.fr
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Abstract

This paper focuses on multi-radio front-end transmitter, a function implied by cognitive radio (0.5–6 GHz). S and C bands standards (wireless local and metropolitan area networks) present a challenge, due to the signal modulation schemes (orthogonal frequency division multiplex (OFDM)/WCDMA, wideband code division multiple access) dynamic (tens of dBs), driving us to a mandatory transmitter linearization. The idea is to provide frequency, flexibility, and average power control of a multi-radio high-efficiency front end for such signals (polar/envelope elimination and restoration (EER) structure). The study implies antennas design and average power control demonstration. Based on a switched mode power amplifier (PA), a discrete detuning is possible to adapt the PA at both “WiMAX” and “Wifi5” frequencies. This architecture amplifies signals with amplitude information. This is coded here by the ΣΔ/PWM (pulse width modulation) technique, to present a constant envelope signal. The amplitude information is restored by a pass-band radio frequency (RF) filter. The antenna can be designed with a notch, to reduce the filtering constraints (selectivity and standards coexistences) and to help in the restoration of amplitude information. Average power control is illustrated by voltage supply variation and results are a possible dynamic of 9.5 dB. To complete the analysis, the simulation of the propagation channel, including antennas, with CST (free space, line of sight) is imported under AGILENT-ADS.

Keywords

Power amplifiers and linearizersAntennas
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 4 , Issue 5 , October 2012 , pp. 483 - 493
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2012

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