The Experts below are selected from a list of 2256 Experts worldwide ranked by ideXlab platform

Tatsuo Itoh - One of the best experts on this subject based on the ideXlab platform.

  • composite right left handed transmission line based compact resonant antennas for rf Module Integration
    IEEE Transactions on Antennas and Propagation, 2006
    Co-Authors: Kevin M K H Leong, Tatsuo Itoh
    Abstract:

    Several electrically small resonant antennas employing the composite right/left-handed transmission line (CRLH-TL) are presented for Integration with portable RF Modules. The proposed antenna designs are based on the unique property of anti-parallel phase and group velocity of the CRLH-TL at its fundamental mode. In this mode, the propagation constant increases as the frequency decreases, therefore, a small guided wavelength can be obtained at a lower frequency to provide the small lambdag/2 resonant length used to realize a compact antenna design. Furthermore, the physical size and the operational frequency of the antenna depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL, including series inductance, series capacitance, shunt inductance and shunt capacitance. Optimization of these parameters as well as miniaturization techniques of the physical size of unit cell is investigated. A four unit-cell resonant antenna is designed and tested at 1.06 GHz. The length, width and height of the proposed antenna are 1/19lambda0, 1/23lambda0 and 1/83lambda0, respectively. In addition, a compact antenna using a 2-D three by three mushroom like unit cell arrangement is developed at 1.17 GHz, showing that an increased gain of 0.6 dB and higher radiation efficiency can be achieved over the first prototype antenna. The same design is applied in the development of a circularly polarized antenna operating at 2.46 GHz. A 116deg beamwidth with axial ratio better than 3 dB is observed. The physical size of the proposed mushroom type small antenna and the circularly polarized antenna is 1/14lambda0 by 1/14lambda0 by 1/39lambda0 and 1/10lambda0 by 1/10lambda 0 by 1/36lambda0, respectively

  • Composite right/left-handed transmission line based compact resonant antennas for RF Module Integration
    IEEE Transactions on Antennas and Propagation, 2006
    Co-Authors: Cheng Jung Lee, Kevin M K H Leong, Tatsuo Itoh
    Abstract:

    Several electrically small resonant antennas employing the composite right/left-handed transmission line (CRLH-TL) are presented for Integration with portable RF Modules. The proposed antenna designs are based on the unique property of anti-parallel phase and group velocity of the CRLH-TL at its fundamental mode. In this mode, the propagation constant increases as the frequency decreases, therefore, a small guided wavelength can be obtained at a lower frequency to provide the small lambdag/2 resonant length used to realize a compact antenna design. Furthermore, the physical size and the operational frequency of the antenna depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL, including series inductance, series capacitance, shunt inductance and shunt capacitance. Optimization of these parameters as well as miniaturization techniques of the physical size of unit cell is investigated. A four unit-cell resonant antenna is designed and tested at 1.06 GHz. The length, width and height of the proposed antenna are 1/19lambda0, 1/23lambda0 and 1/83lambda0, respectively. In addition, a compact antenna using a 2-D three by three mushroom like unit cell arrangement is developed at 1.17 GHz, showing that an increased gain of 0.6 dB and higher radiation efficiency can be achieved over the first prototype antenna. The same design is applied in the development of a circularly polarized antenna operating at 2.46 GHz. A 116deg beamwidth with axial ratio better than 3 dB is observed. The physical size of the proposed mushroom type small antenna and the circularly polarized antenna is 1/14lambda0 by 1/14lambda0 by 1/39lambda0 and 1/10lambda0 by 1/10lambda 0 by 1/36lambda0, respectively

Kevin M K H Leong - One of the best experts on this subject based on the ideXlab platform.

  • composite right left handed transmission line based compact resonant antennas for rf Module Integration
    IEEE Transactions on Antennas and Propagation, 2006
    Co-Authors: Kevin M K H Leong, Tatsuo Itoh
    Abstract:

    Several electrically small resonant antennas employing the composite right/left-handed transmission line (CRLH-TL) are presented for Integration with portable RF Modules. The proposed antenna designs are based on the unique property of anti-parallel phase and group velocity of the CRLH-TL at its fundamental mode. In this mode, the propagation constant increases as the frequency decreases, therefore, a small guided wavelength can be obtained at a lower frequency to provide the small lambdag/2 resonant length used to realize a compact antenna design. Furthermore, the physical size and the operational frequency of the antenna depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL, including series inductance, series capacitance, shunt inductance and shunt capacitance. Optimization of these parameters as well as miniaturization techniques of the physical size of unit cell is investigated. A four unit-cell resonant antenna is designed and tested at 1.06 GHz. The length, width and height of the proposed antenna are 1/19lambda0, 1/23lambda0 and 1/83lambda0, respectively. In addition, a compact antenna using a 2-D three by three mushroom like unit cell arrangement is developed at 1.17 GHz, showing that an increased gain of 0.6 dB and higher radiation efficiency can be achieved over the first prototype antenna. The same design is applied in the development of a circularly polarized antenna operating at 2.46 GHz. A 116deg beamwidth with axial ratio better than 3 dB is observed. The physical size of the proposed mushroom type small antenna and the circularly polarized antenna is 1/14lambda0 by 1/14lambda0 by 1/39lambda0 and 1/10lambda0 by 1/10lambda 0 by 1/36lambda0, respectively

  • Composite right/left-handed transmission line based compact resonant antennas for RF Module Integration
    IEEE Transactions on Antennas and Propagation, 2006
    Co-Authors: Cheng Jung Lee, Kevin M K H Leong, Tatsuo Itoh
    Abstract:

    Several electrically small resonant antennas employing the composite right/left-handed transmission line (CRLH-TL) are presented for Integration with portable RF Modules. The proposed antenna designs are based on the unique property of anti-parallel phase and group velocity of the CRLH-TL at its fundamental mode. In this mode, the propagation constant increases as the frequency decreases, therefore, a small guided wavelength can be obtained at a lower frequency to provide the small lambdag/2 resonant length used to realize a compact antenna design. Furthermore, the physical size and the operational frequency of the antenna depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL, including series inductance, series capacitance, shunt inductance and shunt capacitance. Optimization of these parameters as well as miniaturization techniques of the physical size of unit cell is investigated. A four unit-cell resonant antenna is designed and tested at 1.06 GHz. The length, width and height of the proposed antenna are 1/19lambda0, 1/23lambda0 and 1/83lambda0, respectively. In addition, a compact antenna using a 2-D three by three mushroom like unit cell arrangement is developed at 1.17 GHz, showing that an increased gain of 0.6 dB and higher radiation efficiency can be achieved over the first prototype antenna. The same design is applied in the development of a circularly polarized antenna operating at 2.46 GHz. A 116deg beamwidth with axial ratio better than 3 dB is observed. The physical size of the proposed mushroom type small antenna and the circularly polarized antenna is 1/14lambda0 by 1/14lambda0 by 1/39lambda0 and 1/10lambda0 by 1/10lambda 0 by 1/36lambda0, respectively

Cheng Jung Lee - One of the best experts on this subject based on the ideXlab platform.

  • Composite right/left-handed transmission line based compact resonant antennas for RF Module Integration
    IEEE Transactions on Antennas and Propagation, 2006
    Co-Authors: Cheng Jung Lee, Kevin M K H Leong, Tatsuo Itoh
    Abstract:

    Several electrically small resonant antennas employing the composite right/left-handed transmission line (CRLH-TL) are presented for Integration with portable RF Modules. The proposed antenna designs are based on the unique property of anti-parallel phase and group velocity of the CRLH-TL at its fundamental mode. In this mode, the propagation constant increases as the frequency decreases, therefore, a small guided wavelength can be obtained at a lower frequency to provide the small lambdag/2 resonant length used to realize a compact antenna design. Furthermore, the physical size and the operational frequency of the antenna depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL, including series inductance, series capacitance, shunt inductance and shunt capacitance. Optimization of these parameters as well as miniaturization techniques of the physical size of unit cell is investigated. A four unit-cell resonant antenna is designed and tested at 1.06 GHz. The length, width and height of the proposed antenna are 1/19lambda0, 1/23lambda0 and 1/83lambda0, respectively. In addition, a compact antenna using a 2-D three by three mushroom like unit cell arrangement is developed at 1.17 GHz, showing that an increased gain of 0.6 dB and higher radiation efficiency can be achieved over the first prototype antenna. The same design is applied in the development of a circularly polarized antenna operating at 2.46 GHz. A 116deg beamwidth with axial ratio better than 3 dB is observed. The physical size of the proposed mushroom type small antenna and the circularly polarized antenna is 1/14lambda0 by 1/14lambda0 by 1/39lambda0 and 1/10lambda0 by 1/10lambda 0 by 1/36lambda0, respectively

Anna Tonazzini - One of the best experts on this subject based on the ideXlab platform.

  • EUSIPCO - Visual Module Integration for optical flow estimation
    1998
    Co-Authors: Luigi Bedini, Andrea Cannata, Mario Ferraro, Emanuele Salerno, Anna Tonazzini
    Abstract:

    A technique to integrate gradient-based and feature-based Modules to estimate the optical flow from a pair of images is proposed. The Integration strategy is based on a Bayesian approach, where the optical flow is evaluated as the minimizer of a suitable posterior energy function, containing all the gradient and feature information on the problem. The capability of the technique to constrain the displacement in the neighbourhoods of motion discontinuities has been tested.

  • Visual Module Integration for optical flow estimation
    9th European Signal Processing Conference (EUSIPCO 1998), 1998
    Co-Authors: Luigi Bedini, Andrea Cannata, Mario Ferraro, Emanuele Salerno, Anna Tonazzini
    Abstract:

    A technique to integrate gradient-based and feature-based Modules to estimate the optical flow from a pair of images is proposed. The Integration strategy is based on a Bayesian approach, where the optical flow is evaluated as the minimizer of a suitable posterior energy function, containing all the gradient and feature information on the problem. The capability of the technique to constrain the displacement in the neighbourhoods of motion discontinuities has been tested.

Bernd Tillack - One of the best experts on this subject based on the ideXlab platform.

  • MEMS Module Integration into SiGe BiCMOS technology for embedded system applications
    Proceedings of the IEEE Bipolar/BiCMOS Circuits and Technology Meeting, 2012
    Co-Authors: Murat Kaynak, Hermann Schumacher, Vaclav Valenta, Bernd Tillack
    Abstract:

    The latest developments in RF-MEMS technology have paved the way for achieving high performance systems. Integration of MEMS Modules into a BiCMOS process using an embedded solution is appearing to be the most promising one to enable the realization of fully integrated smart systems. This work gives an overview on different RF-MEMS Modules integrated to a 0.25µm SiGe BiCMOS process. Back-end-of-line (BEOL) Integration, Substrate-Etch and Above-IC Modules for mm-wave applications are detailed by different MEMS device examples.

  • MEMS Module Integration into SiGe BiCMOS technology for embedded system applications
    2012 IEEE Bipolar BiCMOS Circuits and Technology Meeting (BCTM), 2012
    Co-Authors: Murat Kaynak, Hermann Schumacher, Vaclav Valenta, Bernd Tillack
    Abstract:

    The introduction of radio frequency micro-electro-mechanical systems (RFMEMS) as a monolithic option into state-of-the-art Si/SiGe BiCMOS foundry processes has paved the way for single chip radio frequency microsystems at millimeter wave frequencies. Deep silicon substrate etch techniques have also been developed to prevent high substrate losses which help in achieving high performance passive components at mm-wave frequencies. Using the same process techniques, realization of highly efficient on-chip antennas has become feasible, which in the millimeter-wave range no longer come with a hefty chip real estate penalty. In this paper, the current status of embedded BiCMOS+MEMS technology development is presented. Reconfigurable circuits using embedded RFMEMS switches and mm-wave transceivers with on-chip antennas are also discussed as application examples.

  • SiGe BiCMOS platform - baseline technology for More Than Moore process Module Integration
    14th IEEE International Symposium on Design and Diagnostics of Electronic Circuits and Systems, 2011
    Co-Authors: Bernd Tillack
    Abstract:

    Summary form only given. Future silicon based integrated circuits technology is targeting on reduced transistor dimensions, increased transistor counts and increased operating frequencies. By reaching the nanometer scale region lateral and vertical structures have to be processed which are close to atomic dimensions (ITRS “More Moore” approach). Moreover, emerging research devices and technologies are under investigation to extend the CMOS technology further on or to evaluate solutions for beyond Si CMOS technologies like introducing Ge or III-V material channel replacement. According to the ITRS the alternative “More Than Moore” approach is targeting on diversification by combining different technologies based on a reasonable scaling level. The paper gives an overview of the “More than Moore” strategy based on examples of IHP's SiGe BiCMOS technology. SiGe BiCMOS technologies combine high speed SiGe HBTs, computing power of CMOS, and high-quality passives on a single chip. RF performance of HBTs has been improved a lot over the years enabling mm-wave applications like automotive radar (77 GHz), high data rate fiber links (>;100 Gb/s), and Gb/s wireless links (60 GHz, 122 GHz,). Research activities are targeting HBTs allowing THz frequencies (EU FP 7 project DOTFIVE). In a “More than Moore” approach the functionality of the BiCMOS technology is extended by integrating optical components (Si Photonics) and MEMS structures. Moreover, the monolithic or hybrid hetero-Integration of Si and III/V compound semiconductor technologies are under investigation enabling new System-on-Chip-solutions.