UHF RFID tags have demonstrated considerable degradation of performance when being attached to products. Absorption, reflection, detuning, and other RF effects decrease the sensitivity of the tags. We are presenting an UHF RFID measurement and performance evaluation test system, which allows for evaluations of designs of labels and ICs. Furthermore, it provides means for quantifying tag performance in various applications through measurements and tests.UHF RFID Tag-Messtechnik und Evaluierungssystem.UHF RFID Tags zeigen eine beachtliche Verschlechterung der Leistung, sobald sie an Objekten angebracht werden. Absorption, Reflexion, Verstimmung und andere RF-Effekte vermindern die Transponder-Sensitivitä t. Es wird ein UHF RFID-Mess-und Leistungsevaluationstestsystem vorgestellt, welches bei der Evaluierung von Labeldesigns und ICs zur Anwendung kommt. IntroductionExperience in implementing UHF RFID systems shows that tags optimized for a given frequency band can suddenly become hardly readable, while in other frequency bands they show an improved performance. Similarly, omni directional tags attached to a product suffer from dead-angle behaviors. Performance of applied tags varies according to product materials, sizes, and surrounding objects. Correct design of RFID hardware setups is therefore dependent on the knowledge of how individual materials and products influence the performance of tags. In this paper, we present a platform for real-time evaluation of UHF RFID tags, which is based on a modular hardware system. The platform is one part of a model-based methodology for real-time verification and optimization of UHF RFID systems (Derbek, 2007) as depicted in Fig. 1.The novel method allows for considerations of operating setups in the design flow of components and brings a technique for verification of the system in application specific conditions. While the technique applied on the simulation platform is based on simulating models of UHF RFID systems, the real-time verification platform provides means for verifications of designs, system optimization and evaluation through measurements and tests. The proposed methodology closes the gap between design of components and optimization of real-world setups in which the components operate.Manufactured products intended for labeling need to be evaluated in terms of their effects on tag performance degradation. On one hand this is necessary in order to quantify the effects and accommodate the tags design to the most possible insensitivity to the effects. On the other hand the information leads to a development of a matrix specifying tag performance requirements for product bins. In these terms, the performance of tags applied on various dielectrics is critical. Therefore the European EPC competence center (EECC) (http:==www.eecc.info) has proposed a system to classify products labeled with RFID tags in order to determine tags that are best suitable for given applications. The proposed platform for real-time evaluation of UHF RFID tags is used to execute measure-

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