The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Juan Lei - One of the best experts on this subject based on the ideXlab platform.

  • experimental demonstration of conformal phased array Antenna via transformation optics
    Scientific Reports, 2018
    Co-Authors: Juan Lei, Juxing Yang, Xi Chen, Zhiya Zhang, Yang Hao
    Abstract:

    Transformation Optics has been proven a versatile technique for designing novel electromagnetic devices and it has much wider applicability in many subject areas related to general wave equations. Among them, quasi-conformal transformation optics (QCTO) can be applied to minimize anisotropy of transformed media and has opened up the possibility to the design of broadband Antennas with arbitrary geometries. In this work, a wide-angle scanning conformal phased array based on all-dielectric QCTO lens is designed and experimentally demonstrated. Excited by the same current distribution as such in a conventional planar array, the conformal system in presence of QCTO lens can preserve the same radiation characteristics of a planar array with wide-angle beam-scanning and low side lobe level (SLL). Laplace’s equation subject to Dirichlet-Neumann boundary conditions is adopted to construct the mapping between the virtual and physical spaces. The isotropic lens with graded refractive index is realized by all-dielectric holey structure after an effective parameter approximation. The measurements of the fabricated system agree well with the simulated results, which demonstrate its excellent wide-angle beam scanning performance. Such demonstration paves the way to a robust but efficient array synthesis, as well as multi-beam and beam forming realization of conformal arrays via transformation optics.

Roel Baets - One of the best experts on this subject based on the ideXlab platform.

  • two dimensional optical phased array Antenna on silicon on insulator
    Optics Express, 2010
    Co-Authors: Karel Van Acoleyen, Hendrik Rogier, Roel Baets
    Abstract:

    Optical wireless links can offer a very large bandwidth and can act as a complementary technology to radiofrequency links. Optical components nowadays are however rather bulky. Therefore, we have investigated the potential of silicon photonics to fabricated integrated components for wireless optical communication. This paper presents a two-dimensional phased array Antenna consisting of grating couplers that couple light off-chip. Wavelength steering of $0.24 degrees /nm is presented reducing the need of active phase modulators. The needed steering range is $1.5 degrees . The 3dB angular coverage range of these Antennas is about $0.007pi sr with a directivity of more than 38dBi and Antenna losses smaller than 3dB.

  • two dimensional optical phased array Antenna on silicon on insulator
    Optics Express, 2010
    Co-Authors: Karel Van Acoleyen, Hendrik Rogier, Roel Baets
    Abstract:

    Optical wireless links can offer a very large bandwidth and can act as a complementary technology to radio-frequency links. However, optical components nowadays are rather bulky. Therefore, we have investigated the potential of silicon photonics to fabricate integrated components for wireless optical communication. This paper presents a two-dimensional phased array Antenna consisting of grating couplers that couple light off-chip. Wavelength steering of 0.24°/nm is presented, reducing the need of active phase modulators. The required steering range is 1.5°. The 3dB angular coverage range of these Antennas is 0.007π sr with a directivity of more than 38dBi and Antenna losses smaller than 3dB.

N Bernstein - One of the best experts on this subject based on the ideXlab platform.

  • the first demonstration of an optically steered microwave phased array Antenna using true time delay
    Journal of Lightwave Technology, 1991
    Co-Authors: A Walston, Gregory L Tangonan, J J Lee, I L Newberg, N Bernstein
    Abstract:

    The concept of true-time-delay steering for phased array Antennas and its advantage over phase shifters in broadband applications are described with particular emphasis on the potential advantages offered by fiber-optic delay lines. The system architecture of the phased array Antenna and the design and performance of the fiber-optic time-shifter networks in the Antenna are described. The radiation patterns of the phased array Antenna at L and X bands are presented. Using semiconductor laser switching to implement the delay times, the absence of beam squint in the Antenna pattern and its frequency was switched from L to X band is demonstrated. >

Yang Hao - One of the best experts on this subject based on the ideXlab platform.

  • experimental demonstration of conformal phased array Antenna via transformation optics
    Scientific Reports, 2018
    Co-Authors: Juan Lei, Juxing Yang, Xi Chen, Zhiya Zhang, Yang Hao
    Abstract:

    Transformation Optics has been proven a versatile technique for designing novel electromagnetic devices and it has much wider applicability in many subject areas related to general wave equations. Among them, quasi-conformal transformation optics (QCTO) can be applied to minimize anisotropy of transformed media and has opened up the possibility to the design of broadband Antennas with arbitrary geometries. In this work, a wide-angle scanning conformal phased array based on all-dielectric QCTO lens is designed and experimentally demonstrated. Excited by the same current distribution as such in a conventional planar array, the conformal system in presence of QCTO lens can preserve the same radiation characteristics of a planar array with wide-angle beam-scanning and low side lobe level (SLL). Laplace’s equation subject to Dirichlet-Neumann boundary conditions is adopted to construct the mapping between the virtual and physical spaces. The isotropic lens with graded refractive index is realized by all-dielectric holey structure after an effective parameter approximation. The measurements of the fabricated system agree well with the simulated results, which demonstrate its excellent wide-angle beam scanning performance. Such demonstration paves the way to a robust but efficient array synthesis, as well as multi-beam and beam forming realization of conformal arrays via transformation optics.

Naser Ojaroudiparchin - One of the best experts on this subject based on the ideXlab platform.

  • wide scan phased array Antenna fed by coax to microstriplines for 5g cell phones
    2016 21st International Conference on Microwave Radar and Wireless Communications (MIKON), 2016
    Co-Authors: Naser Ojaroudiparchin, Ming Shen, Gert Frølund Pedersen
    Abstract:

    The new design and analysis of a wide-scan phased array Antenna for the future 5G cellphone platforms is proposed in this manuscript. The Antenna is designed on a low-cost FR-4 substrate with 0.8 mm thickness, 4.3 permittivity, and overall size of Wsub×Lsub=60×120 mm2. Eight dipole Antenna elements fed by coax-to-microstriplines have been used to form a linear array at the top portion of the cellphone PCB. The Antenna is working at 24 GHz and has end-fire radiation beams with a wide-angle scanning capability. The simulated results in terms of different Antenna specifications have been presented and discussed.

  • a 28 ghz fr 4 compatible phased array Antenna for 5g mobile phone applications
    International Symposium on Antennas and Propagation, 2015
    Co-Authors: Naser Ojaroudiparchin, Ming Shen, Gert Frølund Pedersen
    Abstract:

    The design of a 28 GHz phased array Antenna for future fifth generation (5G) mobile-phone applications has been presented in this paper. The proposed Antenna can be implemented using low cost FR-4 substrates, while maintaining good performance in terms of gain and efficiency. This is achieved by employing a new air-filled slot-loop structure as the radiator. A prototype array consisting of ten radiator elements has been designed for concept validation. Both the radiation and total efficiencies of the Antenna array are higher than ™0.5 dB (90%) for the scanning range between 0° to 50°, while the gains are higher than 13 dB. In addition, the simulated and experimental results show that the Antenna has the S11 response less than ™10 dB in the frequency range of 27 to 29 GHz.

  • design of vivaldi Antenna array with end fire beam steering function for 5g mobile terminals
    Telecommunications Forum, 2015
    Co-Authors: Naser Ojaroudiparchin, Ming Shen, Gert Fr⊘lund Pedersen
    Abstract:

    This manuscript proposes a new design of phased array Antenna for future fifth generation (5G) cellular communications. The proposed phased array Antenna is designed on a low-cost N9000 PTFE substrate with overall size of 60×130×0.8 mm3. It consists of eight 28-GHz Vivaldi Antenna elements used to form a linear phased array in the edge region (top-side) on a mobile phone PCB. The simulated results show that the Antenna has the reflection coefficient (S11) less than −10 dB in the frequency range of 27.4 to 28.6 GHz. The proposed phased array Antenna has good gain, efficiency, and 3D beam steering characteristics in the entire operation band, which makes it suitable for millimeter-wave 5G communications. In addition, the performance of the Antenna in the vicinity of user's hand has been investigated in this study.

  • Multi-layer 5G mobile phone Antenna for multi-user MIMO communications
    Telecommunications Forum Telfor (TELFOR), 2015 23rd, 2015
    Co-Authors: Naser Ojaroudiparchin, Gert Fr&#8856, Gert Fr⊘lund Pedersen, Ming Shen, Gert Frølund Pedersen, lund Pedersen
    Abstract:

    In this study, a new design of multi-layer phased array Antenna for millimeter-wave (mm-Wave) fifth generation (5G) mobile terminals is proposed. The proposed linear phased array Antenna is designed on four layers of the Rogers RT5880 substrates to operate at 28 GHz which is under consideration for 5G wireless communications. Two identical linear sub arrays can be simultaneously used at different sides of the mobile-phone printed circuit board (PCB) for operation in diversity or multiple-input multiple-output (MIMO) modes. Each sub array contains eight elements of very compact off-center dipole Antennas with dimensions of 5.4×0.65 mm2. The feature of compact design with good beam-steering function makes them well-suited to integrate into the mobile-phone mock-up. The fundamental properties of the proposed Antenna have been investigated. Simulations show that the proposed 5G Antenna is effective for the required beam-coverage in multi-user MIMO communications.