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Introduction
Along with the growing complexity of logistic chains the demand for transparency of informations has increased. The use of intelligent RFID-Technology offers the possibility to optimize and control all capacities in use, since it enables the identification and tracking of goods alongside the entire supply chain. Every single product can be located at any given time and a multitude of current and historical data can be transferred.
The interaction of the flow of material and the flow of information between the various process steps can be optimized by using RFID-Technology since it guarantees that all required data is available at the right time and at the right place. The local accessibility and convertibility of data allows a flexible, decentralised control of logistic systems. As additional advantages of RFID-Components can be considered that they are individually writable and that their identification can be achieved over considerable distances even if there is no intervisibility between tag and reader. The use of RFID-Transponder opens up new potentials regarding process security, reduction of logistic costs or availability of products.
These advantages depend on reliability of the identification processes. The undisputed potentials that are made accessible by the use of RFID-Elements can only be beneficial when the informations that are decentralised and attached to goods and loading equipment can be reliably retrieved at the required points. The communication between tag and reader can be influenced by different materials such as metal, that can disturbed or complicate the radio contact. The communications reliability is subject of various tests and experiments that analyse the effects of different filling materials as well as different alignments of tags on the loading equipment.

1. RFID technology - basics
RFID stands for radio frequency identification. The term describes the way in which a transponder and the corresponding read/write unit communicate with each other.
The use of RFID technology for identification purposes is superior to the currently used bar-code method due to the following aspects [Overmeyer05]:
• Additional information such as expiration date, origin, etc. can be set directly on the transponder
• Depending on the design of the system transponders can be programmed within the logistics system
• Unambiguous identification of items by means of a unique transponder ID number
• No visual connection is required between the transponder and reader
• Identification without additional handling of the item
• Transponders can be placed in a position where they are protected against mechanical (damage, loss,...) as well as chemical (acids, dirt, …) influences
• Enables recognition of several transponders during a single read operation (bulk recognition)