Abstract: The cabtyre cables are widely used in power distribution systems. It is necessary to have an accurate cable models to predict switching or lightning surges. Transient characteristics on the cabtyre cable are measured. The cabtyre cable frequency characteristic of characteristic impedance and propagation constant are studied and discussed for aerial mode. It is found for the aerial mode-2 cable characteristic impedance can be represented by RL series circuit. The attenuation increases as the frequency increases. This study supports to develop a generalized frequency dependent cabtyre cable model.

• Publication Date: 12-Mar-2012
• DOI: 10.15224/978-981-07-1847-3-743
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Abstract: Ultra wide band (UWB) leads promising technology for next generation communication especially for high data rate & short range application. Existing secure RFID tags rely on digital cryptographic primitives in the form of hashes & blocks ciphers which leads to large system latencies. Existing RFID systems can easily be eavesdropped or jammed. To overcome the above problem we propose a new approach for secure passive RFIDs based on UWB communication. In architecture of UWB the time hopped pulse position modulation (TH-PPM), in which the hopping sequence is known only to the reader & the tag. Eavesdropping of the communication is extremely difficult by adopting the hopping sequence as a secret parameter, thus by using UWB modulation technique we can avoid digital cryptography

• Publication Date: 12-Mar-2012
• DOI: 10.15224/978-981-07-1847-3-749
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