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Antenna Radiation Patterns

The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Ismail Guvenc – 1st expert on this subject based on the ideXlab platform

  • VTC-Fall – Energy Harvesting in Unmanned Aerial Vehicle Networks with 3D Antenna Radiation Patterns
    2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall), 2019
    Co-Authors: Esma Turgut, M. Cenk Gursoy, Ismail Guvenc

    Abstract:

    In this paper, an analytical framework is provided to analyze the energy coverage performance of unmanned aerial vehicle (UAV) energy harvesting networks with clustered user equipments (UEs). Locations of UAVs are modeled as a Poison Point Process (PPP), while locations of UEs are modeled as a Poisson Cluster Process (PCP). Two different models are considered for the line-of-sight (LOS) probability function to compare their effect on the network performance. Moreover, ultra-wideband (UWB) Antennas with doughnut-shaped Radiation Patterns are employed in both UAVs and UEs, and the impact of practical 3D Antenna Radiation Patterns on the network performance is also investigated. Initially, the complementary cumulative distribution function (CCDF) and probability density function (PDF) of path losses for each tier are derived. Subsequently, association probabilities with each tier are obtained. Energy coverage probability is derived for the entire network using tools from stochastic geometry. Via numerical results, we show that UAV height and Antenna orientation play crucial roles on the energy coverage performance.

  • impact of 3d Antenna Radiation Patterns on tdoa based wireless localization of uavs
    arXiv: Signal Processing, 2019
    Co-Authors: Priyanka Sinha, Yavuz Yapici, Ismail Guvenc

    Abstract:

    Next big commercial applications of drones require to fly the drone beyond the visual line of sight (BVLOS). This inevitable ability to fly BVLOS will also necessitate the ability to keep track of the drone’s location, in order to ensure successful completion of the intended service. In this context, we explore the fundamental limits of 3D localization of drones in conjunction with the effects of the 3D Antenna Radiation Patterns. Although the localization of drone/unmanned aerial vehicle (UAV) is a well-studied topic in the literature, its relationship to the Antenna effects remains mostly unexplored. In this paper, we investigate the impact of Antenna Radiation pattern on the accuracy of time-difference-of-arrival (TDOA)-based localization of the UAV. Specifically, we consider a scenario where a fixed number of radio-frequency (RF) sensors, placed at some known locations on the ground, collect the TDOA measurements from the signals transmitted from the UAV and estimate the location of the UAV from these observations. In order to study the impact of the Antenna effects on the fundamental limits of the TDOA-based positioning scheme, we develop a simple analytical model to approximate the total Antenna gains experienced by an air-to-ground (A2G) link, for various orientations of the Antennas. We then derive the Cramer-Rao lower bound for the TDOA based localization scheme, for all three combinations of the transmit and the receive Antenna orientations: vertical-vertical (VV), horizontal-horizontal (HH), and vertical-horizontal (VH).

  • INFOCOM Workshops – Impact of 3D Antenna Radiation Patterns on TDOA-Based Wireless Localization of UAVs
    IEEE INFOCOM 2019 – IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), 2019
    Co-Authors: Priyanka Sinha, Yavuz Yapici, Ismail Guvenc

    Abstract:

    Next big commercial applications of drones require to fly the drone beyond the visual line of sight (BVLOS). This inevitable ability to fly BVLOS will also necessitate the ability to keep track of the drone’s location, in order to ensure successful completion of the intended service. In this context, we explore the fundamental limits of 3D localization of drones in conjunction with the effects of the 3D Antenna Radiation Patterns. Although localization of drone/unmanned aerial vehicle (UAV) is a well-studied topic in the literature, its relationship to the Antenna effects remains mostly unexplored. In this paper, we investigate the impact of Antenna Radiation pattern on the accuracy of time-difference-of-arrival (TDOA)-based localization of the UAV. Specifically, we consider a scenario where a fixed number of radio-frequency (RF) sensors, placed at some known locations on the ground, collect the TDOA measurements from the signals transmitted from the UAV, and estimate the location of the UAV from these observations. In order to study the impact of the Antenna effects on the fundamental limits of the TDOA-based positioning scheme, we develop a simple analytical model to approximate the total Antenna gains experienced by an air-to-ground (A2G) link, for various orientations of the Antennas. We then derive the Cramer-Rao lower bound for the TDOA based localization scheme, for all three combinations of the transmit and the receive Antenna orientations: vertical-vertical (VV), horizontal-horizontal (HH), and vertical-horizontal (VH).

Gabriel M. Rebeiz – 2nd expert on this subject based on the ideXlab platform

  • Millimeter-wave tapered-slot Antennas on synthesized low permittivity substrates
    IEEE Transactions on Antennas and Propagation, 1999
    Co-Authors: Jeremy B. Muldavin, Gabriel M. Rebeiz

    Abstract:

    This paper presents 30-GHz linear-tapered slot Antennas (LTSA) and 94-GHz constant-width slot Antennas (CSWA) on synthesized low dielectric constant substrates (εr=2.2). The performance of tapered-slot Antennas (TSA) is sensitive to the effective thickness of the substrate. We have reduced the effective thickness by selectively machining holes in the dielectric substrate. The machined substrate Antenna Radiation Patterns were significantly improved independent of the machined hole size or lattice as long as the quasi-static effective thickness remained the same, even if the hole/lattice geometry is comparable to a wavelength. The method was applied at 94 GHz on a CSWA with excellent Radiation pattern improvement, making it suitable for f/1.6 imaging array applications

  • Millimeter-wave tapered-slot Antennas on synthesized low permittivity substrates
    IEEE Transactions on Antennas and Propagation, 1999
    Co-Authors: Jeremy B. Muldavin, Gabriel M. Rebeiz

    Abstract:

    This paper presents 30-GHz linear-tapered slot Antennas (LTSA) and 94-GHz constant-width slot Antennas (CSWA) on synthesized low dielectric constant substrates (/spl epsiv//sub r/=2.2). The performance of tapered-slot Antennas (TSA) is sensitive to the effective thickness of the substrate. We have reduced the effective thickness by selectively machining holes in the dielectric substrate. The machined substrate Antenna Radiation Patterns were significantly improved independent of the machined hole size or lattice as long as the quasi-static effective thickness remained the same, even if the hole/lattice geometry is comparable to a wavelength. The method was applied at 94 GHz on a CSWA with excellent Radiation pattern improvement, making it suitable for f/1.6 imaging array applications.

Jeremy B. Muldavin – 3rd expert on this subject based on the ideXlab platform

  • Millimeter-wave tapered-slot Antennas on synthesized low permittivity substrates
    IEEE Transactions on Antennas and Propagation, 1999
    Co-Authors: Jeremy B. Muldavin, Gabriel M. Rebeiz

    Abstract:

    This paper presents 30-GHz linear-tapered slot Antennas (LTSA) and 94-GHz constant-width slot Antennas (CSWA) on synthesized low dielectric constant substrates (εr=2.2). The performance of tapered-slot Antennas (TSA) is sensitive to the effective thickness of the substrate. We have reduced the effective thickness by selectively machining holes in the dielectric substrate. The machined substrate Antenna Radiation Patterns were significantly improved independent of the machined hole size or lattice as long as the quasi-static effective thickness remained the same, even if the hole/lattice geometry is comparable to a wavelength. The method was applied at 94 GHz on a CSWA with excellent Radiation pattern improvement, making it suitable for f/1.6 imaging array applications

  • Millimeter-wave tapered-slot Antennas on synthesized low permittivity substrates
    IEEE Transactions on Antennas and Propagation, 1999
    Co-Authors: Jeremy B. Muldavin, Gabriel M. Rebeiz

    Abstract:

    This paper presents 30-GHz linear-tapered slot Antennas (LTSA) and 94-GHz constant-width slot Antennas (CSWA) on synthesized low dielectric constant substrates (/spl epsiv//sub r/=2.2). The performance of tapered-slot Antennas (TSA) is sensitive to the effective thickness of the substrate. We have reduced the effective thickness by selectively machining holes in the dielectric substrate. The machined substrate Antenna Radiation Patterns were significantly improved independent of the machined hole size or lattice as long as the quasi-static effective thickness remained the same, even if the hole/lattice geometry is comparable to a wavelength. The method was applied at 94 GHz on a CSWA with excellent Radiation pattern improvement, making it suitable for f/1.6 imaging array applications.