Results 1 to 10 of about 184,560 (262)

A Dual-Band Dual-Circular-Polarization Antenna for Ka-Band Satellite Communications [PDF]

IEEE Antennas and Wireless Propagation Letters, 2017
A novel Ka-band dual-band dual-circularly-polarized antenna array is presented in this letter. A dual-band antenna with left-hand circular polarization for the Ka-band downlink frequencies and right-hand circular polarization for the Ka-band uplink frequencies is realized with compact annular ring slots. By applying the sequential rotation technique, a
Raphaël Gillard, L Roy
exaly   +4 more sources

Dual-Band Infrared PbS Colloidal Quantum Dot Focal Plane Array [PDF]

Nature Communications
Near-infrared and short-wave infrared dual-band detection has emerged as a pivotal enabling technology in across diverse applications spanning material identification, biological diagnostics, and machine vision.
Yunxiang Di, Kun Ba, Lingfeng Ye, Qianru Zhao, Xingyu Qi, Weiyi Tang, Hanting Wang, Yi Long, Yan Chen, Xudong Wang, Zhangcheng Huang, Shenyang Huang, Yun Tang, Tie Lin, Hong Shen, Xiangjian Meng, Hugen Yan, Qi Liu, Jianlu Wang, Junhao Chu, Ming Liu   +20 more
doaj   +2 more sources

Dual‐band electrochromic materials for energy‐saving smart windows

Carbon Neutralization, 2023
Smart windows refer to those which can dynamically modulate the transmitted light by changing their colors. Dual‐band electrochromic materials (ECMs) refer to materials that can change their colors and regulate light transmission in both visible (VIS ...
Siming Zhao, Baoshun Wang, Na Zhu, Ya Huang, Fei Wang, Run Li, Yanlong Zhao, Qinyuan Jiang, Xueke Wu, Rufan Zhang   +9 more
doaj   +2 more sources

Dual-Band Dual-Linearly Polarized Transmitarray at Ka-Band

2020 50th European Microwave Conference (EuMC), 2021
We present here the design and optimization of a dual-band dual linearly-polarized transmitarray antenna with a 1bit phase resolution (i.e. two phase states with 180° of relative phase-shift). The antenna operates in both downlink and uplink K/Ka-bands (17 – 21 GHz for the lower frequency band, and 27 – 31 GHz for the upper one) and could be used for ...
Madi, Reda, Clemente, Antonio, Sauleau, Ronan   +2 more
openaire   +1 more source

Photonic Generation and Transmission of Dual-Band Dual-Chirp Microwave Waveforms at C-Band and X-Band With Elimination of Power Fading

IEEE Photonics Journal, 2021
We propose a photonic method to generate and transmit dual-band dual-chirp microwave waveforms based on a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM).
Lu Wang, Tengfei Hao, Guangyi Li, Wenhui Sun, Ming Li, Ninghua Zhu, Wei Li   +6 more
doaj   +1 more source

Photonic Generation of Switchable Dual-Band Dual-Chirp Microwave Waveforms

IEEE Photonics Journal, 2022
In this article, a photonic scheme based on dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM) to generate switchable dual-band dual-chirp microwave waveforms is proposed and experimentally demonstrated.
Shuaiquan Yu, Shuna Yang, Bo Yang, Hao Chi   +3 more
doaj   +1 more source

Fingerprint Positioning Method for Dual-Band Wi-Fi Based on Gaussian Process Regression and K-Nearest Neighbor

ISPRS International Journal of Geo-Information, 2021
Since many Wi-Fi routers can currently transmit two-band signals, we aimed to study dual-band Wi-Fi to achieve better positioning results. Thus, this paper proposes a fingerprint positioning method for dual-band Wi-Fi based on Gaussian process regression
Hongji Cao, Yunjia Wang, Jingxue Bi, Meng Sun, Hongxia Qi, Shenglei Xu   +5 more
doaj   +1 more source

Dual-Band, Dual-Linearly Polarized Transmitarrays for SATCOM Applications at Ka-Band

2022 16th European Conference on Antennas and Propagation (EuCAP), 2022
We propose here a 40×40-element sharedaperture dual-band dual linearly-polarized transmitarray with 1-bit phase resolution and fixed beam at Ka-band. The design is based on a stacked approach where the unit-cell size is compact and is equal to only 0.48×$\lambda_0$λ and 0.32×$\lambda_0$ at 29 GHz and 19 GHz, respectively. The beam-scanning performances
Madi, Reda, Sauleau, Ronan, Clemente, Antonio   +2 more
openaire   +2 more sources

A Novel Dual Band Branch Line Coupler and its Application to Design a Dual Band 4 × 4 Butler Matrix

IEEE Access, 2020
A novel dual band branch line coupler (BLC) has been proposed, designed, implemented, and analyzed in this paper. A dual band 4 $\times 4$ Butler matrix (BM) has also been developed by employing the proposed BLC.
Aijaz M. Zaidi, Mirza Tariq Beg, Binod K. Kanaujia, Jugul Kishor, Karumudi Rambabu   +4 more
doaj   +1 more source

Dual-polarized dual-band antenna element for ISM bands [PDF]

2009 IEEE Antennas and Propagation Society International Symposium, 2009
A dual-band element that operates in two separate industrial, scientific, and medical (ISM) bands is presented that provides dual-linear or dual-circular polarization in each band. The element is ideal for wireless communication applications utilizing multiple protocol and/or Bluetooth technology.
Dorsey, W. M., Zaghloul, A. I.
openaire   +2 more sources