Utilización de mezcladores PHEMT subarmónicos en transpondedores activos para identificación de RF

The design of active transponders for radiofrequency identification has become popular during the last decade, being the subharmonic interrogation one of the preferred formats. The anti-parallel diode connection has been the classical choice for implementing this solution, despite of its critical characteristics. In this paper, the use of PHEMTbased subharmonic transponders is discussed. Some criteria for optimizing their performance are presented, and the potentialities of different topologies for implementing this kind of application are analyzed