A5089331278- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Electromagnetic Scattering and Analysis
- Electromagnetic Compatibility and Measurements
- Energy Harvesting in Wireless Networks
- Electromagnetic Simulation and Numerical Methods
- Millimeter-Wave Propagation and Modeling
- RFID technology advancements
- Metamaterials and Metasurfaces Applications
- Full-Duplex Wireless Communications
- Radio Astronomy Observations and Technology
- Advanced MIMO Systems Optimization
- Wireless Body Area Networks
- Electromagnetic Compatibility and Noise Suppression
- Microwave Imaging and Scattering Analysis
- Geophysical Methods and Applications
- Radar Systems and Signal Processing
- Soil Moisture and Remote Sensing
- Satellite Communication Systems
- Radio Frequency Integrated Circuit Design
- Pulsed Power Technology Applications
- Structural Analysis and Optimization
- Advanced SAR Imaging Techniques
National Taiwan University
2016-2025
King Fahd University of Petroleum and Minerals
2025
The Ohio State University
1996-2024
National Technical University of Athens
2022-2024
King Mongkut's University of Technology North Bangkok
2024
University of Illinois Chicago
2020-2022
Ensemble Therapeutics (United States)
2022
KTH Royal Institute of Technology
2021
ORCID
2019
University of Hawaiʻi at Mānoa
2017-2018
The specific problems encountered in the design of near-field focused planar microstrip arrays for RFID (Radio Frequency IDentification) readers are described. In particular, paper analyzes case a prototype operating at 2.4 GHz, which has been designed and characterized. Improvements with respect to conventional far-field (equal phase arrays) discussed quantified.
The design of a reflectarray antenna is presented when the radiated field focused in near-zone array aperture. In particular, implemented for RFID reader applications at 2.4 GHz. Numerical investigations on radiation characteristics this reflectarray, as well an experimental validation, are to demonstrate its feasibility.
The forward‐backward method has been shown to be an effective iterative technique for the computation of scattering from one‐dimensional rough surfaces, often converging rapidly even very large surface heights. However, previous studies with this have computed interactions between widely separated points on exactly, resulting in O(N 2 ) computational algorithm that becomes intractable sizes, as are required when low grazing incidence angles approached. An acceleration more computing is...
This paper presents an effective and efficient preprocessing algorithm for two-dimensional (2-D) electrocardiogram (ECG) compression to better compress irregular ECG signals by exploiting their inter- intra-beat correlations. To reveal the correlation structure, we first convert signal into a proper 2-D representation, or image. involves few steps including QRS detection alignment, period sorting, length equalization. The resulting representation is then ready be compressed appropriate image...
This paper presents the implementation of Luneburg lens antenna based on a 2-D parallel-plate structure for broadband multibeam radiation at millimeter-wave frequencies. In particular, each beam pattern this has narrow beamwidth along dimension, and exhibits broad other cross section, analogous to from 1-D array antennas embedded inside structure. Furthermore, isolation external structures by top bottom metal parallel plates may reduce distortion interferences, therefore enhance its...
A relatively fast and simple method utilizing Gaussian beams (GBs) is developed which requires only a few seconds on workstation to compute the near/far fields of electrically large reflector antennas when they are illuminated by feed with known radiation pattern. This GB technique fast, because it completely avoids any numerical integration surface required in conventional physical optics (PO) analysis such could take several hours workstation. Specifically, field represented set few,...
This communication examines how to improve the squinted radiation patterns produced by balanced antipodal Vivaldi antenna (BAVA) while retaining its cross-polarization levels. In particular, we propose discarding redundant substrate between metal flares of BAVA and implementing dual-scale slotted edges characteristics. The gain at both lower higher end band is significantly enhanced without increasing size. Moreover, significant reduction in beam squint relative conventional designs...
An antenna-in-package (AiP) of endfire and dual-polarization at 28 GHz is presented. It formed by four periodic antennas broad bandwidth high-isolation, fabricated the low-temperature cofired ceramics technology. The dual-polarizations are realized integrating a horizontal metal stripline-coupled dipole with vertical magneto-electric monopole, incorporated into multilayer architecture for compactness. AiP skillfully implements vias strip lines in cavities between to improve isolation...
F-BM/NSA, H.T. Chou et al., Radio Sci., vol.33, p.1277-87, with computational complexity of O(N) is very efficient in method moment (MoM) modeling large-scale scattering problems from rough surfaces. The previous formulation for PEC surfaces extended to treat impedance Similarly, numerical experiment shows F-BM/NSA far more than the competitive BMIA/CAG order magnitude.
This letter presents the design of a reflectarray antenna consisted metallic elements, which can be manufactured via simple die casting process as that for reflector antennas. In design, reflecting elements are integrated whole piece metal without using any dielectric or air substrates, and result in very high radiation efficiency at low manufacture cost. The is prototyped Ku-band civilian satellite DTV applications. experimental results show up to 90% comparable antennas, demonstrate...
An antenna subsystem is presented for RFID reader applications at 2.45 GHz in the near-zone tag detection. The programmable to adaptively steer radiation beam from one spot another inside target zone, and allows achieve a better signal reception by changing patterns along horizontal cut. created beams have narrow spots, may potentially reduce interference electromagnetic scattering nearby metal structures. prototype examined validate feasibility.
This paper introduces a dual-band dual circularly-polarized (DB-DCP) antenna configuration suitable for the simultaneous uplink and downlink (UL/DL) operation in satellite communication systems. The CP performance is realized by using branch-line coupler (DB-BLC) with +/-90 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</sup> phase offsets between split ports at frequencies. Either same (DB-SCP) or opposite (DB-OCP) antennas can be...
Various isolation improvement techniques for MIMO WLAN card bus applications consisted of three closely spaced loop antennas are presented and investigated both numerically experimentally in this paper.The proposed easily implemented proven effective to achieve high among the which is a must terminals receive uncorrelated signals with good system throughputs.
We present an efficient procedure for the synthesis of planar array antennas to radiate contoured patterns in near zone aperture, as desired RFID applications. It first grids target area, and then utilizes a global basis set span array's excitations. Each basis's excitation radiates focused spot beam serves local function representing radiation field. The unknown coefficients are found via minimum least square error (MLSE) technique. is that only small number functions sufficient synthesize...
We present the design and realization of a microstrip patch array antenna, which is operated at 24 GHz band, can be used in applications vital-sign detection with higher resolution. The uses steepest descent method (SDM) to synthesize excitation phases such that radiation has an optimum near-field pattern desired area. Both theoretical development SDM formulations experimental validations over antenna prototype are presented.
A hybrid uniform geometrical theory of diffraction (UTD)‐moment method (MOM) approach is introduced to provide an efficient analysis the electromagnetic radiation/scattering from electrically large, finite, planar periodic arrays. This study motivated by fact that conventional numerical methods become rapidly inefficient and even intractable for large arrays containing many antenna or frequency‐selective surface (FSS) elements. In present UTD‐MOM approach, number unknowns be solved...
A time-domain version of the uniform geometrical theory diffraction (TD-UTD) is developed to describe, in closed form, transient electromagnetic scattering from a smooth convex surface excited by general time impulsive astigmatic ray field. This TD-UTD impulse response obtained employing an analytic transform (ATT) for inversion available and accurate corresponding frequency domain UTD (FD-UTD) solution. The ATT employed because it overcomes difficulties that occur when inverting FD-UTD...