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Electronics & Communication Engineering Journal

Issue 6 • Date Dec 2002

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Displaying Results 1 - 8 of 8
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  • Future radar developments

    Page(s): 250 - 251
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  • Hidden antennas for vehicles

    Page(s): 253 - 262
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    The introduction of new telematics and broadcast systems into vehicles has led to a requirement for multiple antennas that can be hidden from view. This paper commences by presenting the results of simulations to identify the components of a car's structure that influence the radiation pattern of a printed VHF antenna on the rear windscreen. Two dual-band antenna designs are then presented for operation in the 900 and 1800 MHz telephone bands. The first is a planar inverted-F antenna that can be concealed in the bumpers, the second a hybrid structure based on the top-loaded monopole principle and mounted beneath the vehicle's roof. View full abstract»

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  • GPS and GIS technology trends

    Page(s): 292 - 294
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  • WWRF - the Wireless World Research Forum

    Page(s): 283 - 291
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    Third generation mobile radio systems are currently being deployed in different regions of the world. Future systems beyond the third generation are already under discussion in international bodies and forums such as ITU, WWRF and R&D programmes of the European Union and in other regions. These systems will determine the research and standardisation activities in mobile and wireless communication in the next years. Based on experience of the third generation, future systems will be developed mainly from the user perspective with respect to potential services and applications including traffic demands. Therefore, the Wireless World Research Forum was launched in 2001 as a global and open initiative of manufacturers, network operators, SMEs, R&D centres and the academic domain. WWRF is focused on the vision of such systems - the Wireless World-and potential key technologies. This paper describes the international context of activities on systems beyond third generation, the goals, objectives and structure of WWRF, the user perspective as the starting point for a future system design and the key enabling technologies for the Wireless World. View full abstract»

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  • SIP-based VoIP network and its interworking with the PSTN

    Page(s): 273 - 282
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    The Session Initiation Protocol (SIP) is considered to be a future powerful alternative to the H.323 standard as the signalling system for the dominant Voice over IP (VoIP) communications. This paper provides an in-depth analysis of SIP by describing the SIP protocol stack, summarising the main features of the protocol, and illustrating its architecture, message and operation. The paper also explains the architecture and the two key aspects of signalling interworking when SIP is interconnected with the PSTN. View full abstract»

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  • Opportunities in radar-2002

    Page(s): 263 - 272
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    This paper addresses some of the potential opportunities for achieving advances in radar systems and technology. It is not a summary of current interests in radar, nor is it a forecast of what 'will be', but is speculation about what 'could be' based on the limited experiences and personal biases of the writer. Included are the replacement of existing radars that have been in use for some time, 'on-the-shelf' concepts and demonstrated technology that have yet to be employed, a few new directions that might offer capabilities that do not currently exist, and areas of basic technology that could be further explored to provide new understanding and new capabilities. Although much is included in the paper, it is not meant to be an exhaustive enumeration of the many possible directions for future radar. View full abstract»

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