A5030764233- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Antenna Design and Optimization
- Metamaterials and Metasurfaces Applications
- Energy Harvesting in Wireless Networks
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Wireless Body Area Networks
- Microwave Imaging and Scattering Analysis
- Indoor and Outdoor Localization Technologies
- Gaze Tracking and Assistive Technology
- Non-Invasive Vital Sign Monitoring
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Bluetooth and Wireless Communication Technologies
- Hand Gesture Recognition Systems
- Semiconductor Lasers and Optical Devices
- Radio Frequency Integrated Circuit Design
- Climate variability and models
- Electromagnetic Scattering and Analysis
- Solid State Laser Technologies
- Air Quality and Health Impacts
- Radio Astronomy Observations and Technology
- Millimeter-Wave Propagation and Modeling
Institute of Atmospheric Physics
2020-2024
Chinese Academy of Sciences
2020-2024
Beijing Institute of Technology
2024
University of Southern California
2024
Arizona State University
2024
Advisory Board Company (United States)
2024
Chiba University
2024
University of Pennsylvania
2024
Metacomp Technologies (United States)
2024
META Health
2022-2023
A compact tri-band planar monopole antenna is proposed that employs reactive loading and a ¿defected¿ ground-plane structure. The of the inspired by transmission-line based metamaterials (TL-MTM), which enables loaded to operate in two modes. first resonance exhibits dipolar mode over lower WiFi band 2.40 GHz - 2.48 GHz, second has monopolar 5.15-5.80 upper band. Full-wave analysis shows currents modes are orthogonal each other, resulting radiation patterns far field. feature ground-plane,...
A wideband and compact planar antenna is proposed using a doubly resonant transmission-line metamaterial (TL-MTM) structure. The consists of two TL-MTM arms that resonate at different frequencies. Each arm comprises microstrip loaded with five spiral inductors well matched to 50 Omega through an embedded series meandered line. designed work as single its own frequency, determined by the loading inductance, where zero insertion phase occurs. matching enabled when these resonances suitably...
A simple dual-band metamaterial-inspired small monopole antenna is proposed for WiFi applications. In addition to the regular resonance, loading exploited create a second resonance lower band while maintaining antenna's form-factor. The measured S parameters and radiation patterns show that design suitable emerging WLAN
The optically transparent antenna technology has been gaining attention in consumer electronic industry owing to its potential release the volume constraints compact mobile devices. Earlier studies have heavily focused on integration display for smartphone applications, example, improve spatial coverage of 5G mm-wave at forehead side. To our knowledge, application smart glasses and augmented reality glasses, especially considering from coexistence with optical features lens stack-up,...
Investigations on conformal phased array pattern synthesis using a novel hybrid evolutionary algorithm are presented. First, in order to overcome the drawbacks of standard genetic (GA) and particle swarm optimization (PSO), an improved (IGA) (IPSO) proposed by introducing mechanisms. Then, inspired idea grafting botany, called HIGAPSO is proposed, which combines IGA IPSO take advantages both methods. After that, spherical antenna wide-band stacked patch elements selected as example...
We apply space mapping to antenna design for the first time. exploit a coarse-mesh method of moments (MoM) solver as coarse model and align it with fine-mesh MoM solution through mapping. employ two plans: (I) implicit output mapping, (II) input propose local meshing which avoids inconsistencies in model. The proposed techniques are implemented our user-friendly framework (SMF) system. In double annular ring example, S-parameter is optimized. finite ground size effect efficiently solved by...
During mid January to early February 2006, a series of explosive eruptions occurred at the Augustine volcanic island off southern coast Alaska. By plume ash was transported northward into interior Satellite imagery and Puff transport model predictions confirm that aerosol passed over polarization lidar (0.694 μ m wavelength) site Arctic Facility for Atmospheric Remote Sensing University Alaska Fairbanks. For first time, linear depolarization ratios 0.10–0.15 were measured in fresh...
A simple approach for reducing the mutual coupling in two closely spaced electrically small antennas (ESAs) is proposed based on general idea of field cancellation. The antenna array consists metamaterial-inspired printed monopole antennas. reduced by self-cancellation induced common ground and near-field currents, without introducing additional structures. fabricated prototype a two-element with an edge-to-edge separation ¿ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, a miniaturized circularly polarized (CP) continuous wave Doppler radar system operating at 2.4 GHz is presented. The front end consists of one left-handed CP (LHCP) antenna and right-handed (RHCP) antenna, which share single patch aperture. Orthogonal polarization achieved through modified ring-shaped quadrature hybrid coupler (QHC), the resulting isolation between two antennas better than 30 dB. With 0 dBm input power to transmitting proposed can accurately detect heartbeat...
Gaze estimation methods encounter significant performance deterioration when being evaluated across different domains, because of the domain gap between testing and training data. Existing try to solve this issue by reducing deviation data distribution, however, they ignore existence label in due acquisition mechanism gaze individual physiological differences. In paper, we first point out that influence brought cannot be ignored, propose a alignment algorithm (GLA) eliminate distribution...
A new practical approach to sensitivity analysis of the network parameters high-frequency structures with commercial full-wave electromagnetic (EM) solvers is proposed. We show that computation linear-network parameter derivatives in design-parameter space does not require an adjoint-problem solution. The sensitivities are computed outside EM solver, which simplifies implementation. discuss: 1) features allow user compute and their through a single simulation; 2) accuracy derivatives; 3)...
Linear depolarization ratio ( δ ) data from the summer/winter seasons over first 2 years of Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite operations in green (0.532 μ m) laser channel are analyzed interpreted terms ice cloud microphysical properties. That is, we use variations as a proxy formation environmental conditions that affect crystal shape orientation. The detection algorithm is tuned mainly to cirrus clouds, but also includes polar...
This paper proposes a novel miniaturized wearable antenna (mosaic antenna) for cross-body communication featuring superior performance compared to five commonly utilized topologies. The proposed mosaic optimally excites the surface waves enable yet still with low profile and size. As proof-of-concept of unique capabilities this antenna, an inkjet-printed flexible prototype on Polytetrafluoroethylene (PTFE, also known as Teflon) has been fabricated in highly customizable, scalable low-cost...
Cross-body link refers to the wireless connection between two wearable devices when they are both worn or near body, such as that of a virtual reality (VR) headset and its controllers. It is one most challenging scenarios in terms budget, due severe shadowing effects controllers placed at back side body. This especially true users an outdoor environment where there less reflection from surrounding. paper investigates propagation mechanism, including line-of-sight, ground reflection, creeping...
Abstract During the recent Cirrus Regional Study of Tropical Anvils and Layers (CRYSTAL) Florida Area Experiment (FACE) field campaign in southern Florida, rain showers were probed by a 0.523-μm lidar three (0.32-, 0.86-, 10.6-cm wavelength) Doppler radars. The full repertoire backscattering phenomena was observed melting region, that is, various radar dark bright bands. In contrast to ubiquitous (S band) band, only intermittent evidence is found at 0.86 cm (K band), no clear examples band...
In this fourth of a series papers that describe long-term cloud research at the Facility for Atmospheric Remote Sensing Salt Lake City, Utah, an ∼10-year record polarization lidar and photographic observations is analyzed to characterize occurrence optical displays in our local varieties midlatitude cirrus clouds. The frequencies various types halo, arc, corona are evaluated according their appearance longevity over nominal 1-h observation periods meteorological source cirrus. We find...
A fully printed Veselago-Pendry lens (isotropic $n=\ensuremath{-}1$, ${\ensuremath{\epsilon}}_{r}=\ensuremath{-}1$, ${\ensuremath{\mu}}_{r}=\ensuremath{-}1$) is presented which based on transmission-line metamaterials. The constructed in a parallel-plate environment at 1.569 GHz and without any embedded sources achieves resolution better than the diffraction limit (full width half power of $0.235\ensuremath{\lambda}$). Because low loss ($<0.3\text{ }\text{ }\mathrm{dB}$ per unit cell),...
This paper explores antenna's polarization for Radio-Frequency Identification (RFID) based non-contact human activity detection. For the first time, a cross circular configuration between reader antenna and tag is proposed to increase sensing range spatial sensitivity. Compared conventional RFID configurations - linearly polarized (LP) circularly (CP) reader, CP can improve signal-to-noise ratio (SNR) which leads 230% in detection area over traditional approach our experiment. As result of...
A current transducer based on a Rogowski coil is developed to detect nanosecond pulse signals of the discharge with wide bandwidth 232 kHz–120 MHz and high sensitivity 2.22 V A−1. Performance tests show that has both excellent dynamic static characteristics. Calibration results comparison between standard shunt for measurements pulses demonstrate can reproduce actual waveform accurately.
Currently approaching its sixth year in space, the CALIPSO satellite collects lidar linear depolarization ratios δ from 0.532 μ m laser backscatter, an indicator of particle phase, shape, and orientation. We examine one‐year averages for day night periods when was pointing close to nadir (0.3°) off‐nadir (3.0°), terms geographic location zonal height averages. For first time, also given is dependency on temperature versus latitude ice clouds. The analysis involves all clouds with a cloud top...
A slot array in substrate‐integrated waveguide (SIW) technology fed by a microstrip Rotman lens is proposed. This compact multibeam antenna designed two layers using novel transition based on double‐stepped coupling slots the broad wall of SIWs. Compared with rectangular transverse slot, this broadband and its power can be controlled for low‐sidelobe applications. The radiating part 10 × beam‐forming network generate seven beams good coverage from −30° to 30° azimuthal plane. To validate...
Conventionally, in Doppler radar vital sign detection, two separate linearly polarized TX and RX antennas are used often placed more than half wavelength away from each other to mitigate mutual coupling. However, the overall footprint of system with TX/RX may make it difficult be integrated into compact consumer devices. In this article, a single dual circularly circular patch antenna was presented help achieve miniature system. The proposed designed, integrated, demonstrated 2.4 GHz...