Results 81 to 90 of about 19,229 (302)

Dynamic Optical Lattices Through Conducting Polymer‐Gated Confinement

Advanced Materials, EarlyView.
The conducting polymer gate is incorporated into organic dielectric lattices to control the dynamic switching of nonlocal Mie resonances in the visible/NIR regions. The “closed gate” from oxidized PEDOT confines the light within dielectric nanocylinders and activates nonlocal Mie resonances, while the “opened gate” from reduced PEDOT facilitates ...
Dongqing Lin, Yulong Duan, Suraya Kazi, Magnus P. Jonsson   +3 more
wiley   +1 more source

Radiation Efficiency Improvement Method for Multifeed Circular Polarization Antenna Array with Mutual Coupling Effect

International Journal of Antennas and Propagation, 2014
In the circular polarization antenna array, the input impedance, axial ratio, and radiation pattern of antenna patch will be changed. Compared with the performances of single antenna, the mutual coupling also led to the low efficiency of all antennas.
Zijian Xing, Ling Wang, Jianying Li, Kun Wei   +3 more
doaj   +1 more source

Improving Wide-Angle Scanning Performance of Phased Array Antenna by Dielectric Sheet

IEEE Access, 2019
The method to improve the wide-angle scanning performance of the phased array antenna is studied and presented. The proposed method is realized by the dielectric sheet to reduce the size of the wide beam antenna and mutual coupling between the elements ...
Guangwei Yang, Qingqing Chen, Jianying Li, Shigang Zhou, Zijian Xing   +4 more
doaj   +1 more source

Calibration proposal for new antenna array architectures and technologies for space communications [PDF]

, 2012
In large antenna arrays with a large number of antenna elements, the required number of measurements for the characterization of the antenna array is very demanding in cost and time.
Haro Ariet, Leandro de, Martínez Rodríguez-Osorio, Ramón, Salas Natera, Miguel Alejandro, Sierra Pérez, Manuel   +3 more
core   +2 more sources

Array Antenna Mutual Coupling Analysis——Mutual Coupling Correction Techniques Based on Induced Electromotive Method of Uniform Circular Array Antennas

Hans Journal of Wireless Communications, 2013
互耦效应导致阵列天线单元间耦合能量的矢量和随扫描角而变化，本文结合等效网络和感应电动势法，通过求出互阻抗求解互耦系数实现互耦误差的校正，仿真结果表明，这种技术可以正确的估计来波方向，且计算量较小。 Mutual coupling effects lead to the coupling energy vector between antenna units changing with the scan angle. For antenna array mutual coupling analysis, signal direction can be correctly estimated by solving the mutual coupling matrix and putting mutual
openaire   +1 more source

From the Discovery of the Giant Magnetocaloric Effect to the Development of High‐Power‐Density Systems

Advanced Materials Technologies, EarlyView.
The article overviews past and current efforts on caloric materials and systems, highlighting the contributions of Ames National Laboratory to the field. Solid‐state caloric heat pumping is an innovative method that can be implemented in a wide range of cooling and heating applications.
Agata Czernuszewicz, Yaroslav Mudryk, Jun Cui, Lucas Griffith, Duane D. Johnson, Julie Slaughter   +5 more
wiley   +1 more source

A 24-GHz SiGe Phased-Array Receiver—LO Phase-Shifting Approach [PDF]

, 2005
A local-oscillator phase-shifting approach is introduced to implement a fully integrated 24-GHz phased-array receiver using an SiGe technology. Sixteen phases of the local oscillator are generated in one oscillator core, resulting in a raw beam-forming ...
Guan, Xiang, Hajimiri, Ali, Hashemi, Hossein, Komijani, Abbas   +3 more
core   +1 more source

Mitigation of mutual coupling in microstrip antenna arrays

Технология и конструирование в электронной аппаратуре, 2019
This article demonstrates the alleviation of mutual coupling of a simple and low-cost four-element microstrip array antenna by loading I-shaped slot-type electromagnetic band gap structure in the ground plane. FR-4 glass epoxy is used as dielectric substrate.
K. Prahlada Rao, Van, R.M., Hunagund, P.V.   +2 more
openaire   +3 more sources

Advancements in TLP Bonding for Power Electronics Die‐Attach Applications

Advanced Materials Technologies, EarlyView.
Transient Liquid Phase (TLP) bonding is gaining traction as a lead‐free die‐attach technology in power electronics packaging. This review examines the state of TLP bonding, its key elements, reliability aspects, and practical limitations. This review also highlights emerging trends, such as nanostructured interfaces, that may improve scalability of TLP
Fatin Battal, Davey Boss, René H. Poelma, Elias Vlieg, John J. Schermer   +4 more
wiley   +1 more source

Millisecond‐Switching Dual‐Band/Dual‐Polarization Ka‐Band Wavefront Control Enabled by a Complementary Liquid‐Crystal Metasurface

Advanced Materials Technologies, EarlyView.
An LCD‐compatible complementary liquid‐crystal metasurface delivers dual‐band, dual‐polarized Ka‐band wavefront control with millisecond switching via a 10‐µm LC gap. Interlaced patch/slot pairs enable independent phase tuning at 28 and 38 GHz, while strategic 45° slot rotation suppresses parasitic resonances. Measurements on a 160 × 160‐cell prototype
Daehyeon Kim, Donggeun An, Hyunjae Shin, Youngno Youn, Wonbin Hong   +4 more
wiley   +1 more source