The Experts below are selected from a list of 5040 Experts worldwide ranked by ideXlab platform

A M Abbosh - One of the best experts on this subject based on the ideXlab platform.

  • in road microwave sensor for electronic vehicle identification and tracking Link Budget Analysis and antenna prototype
    IEEE Transactions on Intelligent Transportation Systems, 2018
    Co-Authors: Yifan Wang, Konstanty Bialkowski, Albertus J Pretorius, Abraham G W Du Plooy, A M Abbosh
    Abstract:

    To reduce the cost and increase reliability of the vehicle radio-frequency identification and tracking systems, an alternative placement of the interrogator is investigated. Conventional systems make use of an overhead interrogator that reads a tag in a windscreen or a license plate. The alternative approach is to embed the interrogator in the road and exclusively read license plate tags. In this paper, the Link Budget of such a system is fully characterized assuming the ISO/IEC 18000-63 UHF Type-C RFID standard. The obtained results indicate that a microwave sensor that has an elevated toroidal radiation pattern at around a 20°–30° elevation angle above the horizon is desired. This is a challenging task as road regulations dictate that the sensor cannot exceed a profile of 2.5 cm above the road surface. As an example of a sensor that meets those requirements, a modified discone antenna with an improved impedance matching method is presented. To reduce the antenna’s profile and give the required mechanical strength to withstand the weight of different vehicles on the road, the area between the disc and the cone is filled with Acetal, which has a high dielectric constant. The proposed microwave sensor is fabricated and successfully tested in a real-road environment. The results confirm that the sensor meets the aforementioned strict requirements from the Link Budget Analysis.

Dennis R Alexander - One of the best experts on this subject based on the ideXlab platform.

  • free space optical data center architecture design with fully connected racks
    Global Communications Conference, 2014
    Co-Authors: Abdelbaset S Hamza, Jitender S. Deogun, Dennis R Alexander
    Abstract:

    In this paper, we propose a novel design of a data center (DC) using free space optical (FSO) technology. The proposed FSO-DC design is based on fixed, non-mechanical, FSO Links facilitating the realization of fully connected FSO racks and rows/columns of racks. Each rack becomes a point of intersection of three fully connected sub-networks. We investigate requirements, advantages and challenges of the proposed design. We develop and analyze a switch-free, fully connected FSO rack, present its Link Budget Analysis and validate it by simulation. Results establish the feasibility of a switch-free FSO rack based on the proposed FSO-DC design. A cost estimate for the proposed FSO-DC design is also presented and compared to three well-known conventional DC designs.

  • free space optical data center architecture design with fully connected racks
    Global Communications Conference, 2014
    Co-Authors: Abdelbaset S Hamza, Jitender S. Deogun, Dennis R Alexander
    Abstract:

    In this paper, we propose a novel design of a data center (DC) using free space optical (FSO) technology. The proposed FSO-DC design is based on fixed, non-mechanical, FSO Links facilitating the realization of fully connected FSO racks and rows/columns of racks. Each rack becomes a point of intersection of three fully connected sub-networks. We investigate requirements, advantages and challenges of the proposed design. We develop and analyze a switch-free, fully connected FSO rack, present its Link Budget Analysis and validate it by simulation. Results establish the feasibility of a switch-free FSO rack based on the proposed FSO-DC design. A cost estimate for the proposed FSO-DC design is also presented and compared to three well-known conventional DC designs.

Yifan Wang - One of the best experts on this subject based on the ideXlab platform.

  • in road microwave sensor for electronic vehicle identification and tracking Link Budget Analysis and antenna prototype
    IEEE Transactions on Intelligent Transportation Systems, 2018
    Co-Authors: Yifan Wang, Konstanty Bialkowski, Albertus J Pretorius, Abraham G W Du Plooy, A M Abbosh
    Abstract:

    To reduce the cost and increase reliability of the vehicle radio-frequency identification and tracking systems, an alternative placement of the interrogator is investigated. Conventional systems make use of an overhead interrogator that reads a tag in a windscreen or a license plate. The alternative approach is to embed the interrogator in the road and exclusively read license plate tags. In this paper, the Link Budget of such a system is fully characterized assuming the ISO/IEC 18000-63 UHF Type-C RFID standard. The obtained results indicate that a microwave sensor that has an elevated toroidal radiation pattern at around a 20°–30° elevation angle above the horizon is desired. This is a challenging task as road regulations dictate that the sensor cannot exceed a profile of 2.5 cm above the road surface. As an example of a sensor that meets those requirements, a modified discone antenna with an improved impedance matching method is presented. To reduce the antenna’s profile and give the required mechanical strength to withstand the weight of different vehicles on the road, the area between the disc and the cone is filled with Acetal, which has a high dielectric constant. The proposed microwave sensor is fabricated and successfully tested in a real-road environment. The results confirm that the sensor meets the aforementioned strict requirements from the Link Budget Analysis.

Kenichi Takizawa - One of the best experts on this subject based on the ideXlab platform.

  • antenna system design for improved wireless capsule endoscope Links at 433 mhz
    IEEE Transactions on Antennas and Propagation, 2019
    Co-Authors: Md Suzan Miah, Ahsan Noor Khan, Clemens Icheln, Katsuyuki Haneda, Kenichi Takizawa
    Abstract:

    Wireless capsule endoscopy (WCE) systems are used to capture images of the human digestive tract for medical applications. The antenna is one of the most important components in a WCE system. In this paper, we present novel small antenna solutions for a WCE system operating at the 433 MHz ISM band along with a Link Budget Analysis. The in-body capsule transmitter uses an ultrawideband outer wall conformal loop antenna, whereas the on-body receiver uses a printed monopole antenna with a partial ground plane. A colon-equivalent tissue phantom and CST Gustav voxel human body model were used for the numerical studies of the capsule antenna. The simulation results in the colon-tissue phantom were validated through in vitro measurements using a liquid phantom. According to the phantom simulations, the capsule antenna has −10 dB impedance matching from 309 to 1104 MHz. The ultrawideband characteristic enables the capsule antenna to tolerate the detuning effects due to electronic modules in the capsule and due to the proximity of various different tissues in gastrointestinal tracts. The same design methodology was applied to on-body antennas followed by in vitro and ex vivo measurements for validation. The on-body antenna exceeds −10 dB impedance matching from 385 to 502 MHz both in simulations and measurements. The path loss for the radio Link between an in-body capsule transmitter and an on-body receiver using our antenna solutions, in simulations and measurements, is less than 50 dB for any capsule orientation and location, ensuring sufficient signal level at the receiver, hereby enabling an improved capsule endoscope.

Abdelbaset S Hamza - One of the best experts on this subject based on the ideXlab platform.

  • free space optical data center architecture design with fully connected racks
    Global Communications Conference, 2014
    Co-Authors: Abdelbaset S Hamza, Jitender S. Deogun, Dennis R Alexander
    Abstract:

    In this paper, we propose a novel design of a data center (DC) using free space optical (FSO) technology. The proposed FSO-DC design is based on fixed, non-mechanical, FSO Links facilitating the realization of fully connected FSO racks and rows/columns of racks. Each rack becomes a point of intersection of three fully connected sub-networks. We investigate requirements, advantages and challenges of the proposed design. We develop and analyze a switch-free, fully connected FSO rack, present its Link Budget Analysis and validate it by simulation. Results establish the feasibility of a switch-free FSO rack based on the proposed FSO-DC design. A cost estimate for the proposed FSO-DC design is also presented and compared to three well-known conventional DC designs.

  • free space optical data center architecture design with fully connected racks
    Global Communications Conference, 2014
    Co-Authors: Abdelbaset S Hamza, Jitender S. Deogun, Dennis R Alexander
    Abstract:

    In this paper, we propose a novel design of a data center (DC) using free space optical (FSO) technology. The proposed FSO-DC design is based on fixed, non-mechanical, FSO Links facilitating the realization of fully connected FSO racks and rows/columns of racks. Each rack becomes a point of intersection of three fully connected sub-networks. We investigate requirements, advantages and challenges of the proposed design. We develop and analyze a switch-free, fully connected FSO rack, present its Link Budget Analysis and validate it by simulation. Results establish the feasibility of a switch-free FSO rack based on the proposed FSO-DC design. A cost estimate for the proposed FSO-DC design is also presented and compared to three well-known conventional DC designs.