Results 21 to 30 of about 2,770 (262)

Heartbeat information prediction based on transformer model using millimetre‐wave radar

IET Biometrics, 2023
Millimetre‐wave radar offers high ranging accuracy and can capture subtle vibration information of the human heart. This study proposes a heartbeat prediction method based on the transformer model using millimetre‐wave radar. Firstly, the millimetre‐wave
Bojun Hu, Biao Jin, Hao Xue, Zhenkai Zhang, Zhaoyang Xu, Xiaohua Zhu   +5 more
doaj   +1 more source

Plasmonic semiconductor nanogroove array enhanced broad spectral band millimetre and terahertz wave detection

Light: Science & Applications, 2021
High-performance uncooled millimetre and terahertz wave detectors are required as a building block for a wide range of applications. The state-of-the-art technologies, however, are plagued by low sensitivity, narrow spectral bandwidth, and complicated ...
Jinchao Tong, Fei Suo, Tianning Zhang, Zhiming Huang, Junhao Chu, Dao Hua Zhang   +5 more
doaj   +1 more source

Maximising the utility of enterprise millimetre-wave networks [PDF]

Computer Communications, 2018
Millimetre-wave (mmWave) technology is a promising candidate for meeting the intensifying demand for ultra fast wireless connectivity, especially in high-end enterprise networks. Very narrow beam forming is mandatory to mitigate the severe attenuation specific to the extremely high frequency (EHF) bands exploited.
Nicolò Facchi, Francesco Gringoli, Paul Patras   +2 more
openaire   +4 more sources

Optically Transparent Single-Layer Dual-Frequency Dual-Polarization Metasurface Applied in Close Proximity to Smartphone Millimeter-Wave Phased Array Antenna Systems

IEEE Open Journal of Antennas and Propagation
An optically transparent single-layer dual-frequency dual-polarization metasurface operating at 28 GHz and 38 GHz is proposed to enhance millimeter-wave transmission through glass.
Wen Fu, Igor Syrytsin, Rocio Rodriguez Cano, Peiye Liu, Andrey Kobyakov, Gert Fround Pedersen, Shuai Zhang   +6 more
doaj   +1 more source

NUMERICAL SIMULATION OF STRESS WAVE PROPAGATION IN SAP CONCRETE [PDF]

Civil Engineering Journal, 2018
The SAP (Super Absorbent Polymers) concrete is a new kind of concrete materials with uniformly distributed spherical pores with diameter of millimetre-size.
Zhenqun Sang, Zhiping Deng, Jianglin Xi, Huibin Yao, Jiang Wu   +4 more
doaj   +1 more source

Millimetre-wave optics design & verification [PDF]

AIP Conference Proceedings, 2002
Microwave background astronomy requires very high performance millimetre-wave optical systems. However, compact quasi-optics are difficult to design with any confidence using techniques developed for visible wavelengths. In this paper we investigate the performance of existing software design tools (ASAP, CODE V, GLAD) as well as a Gaussian beam mode ...
O'Sullivan, Créidhe, Murphy, J.Anthony, Withington, Stafford, Yassin, Ghassan, Atad-Ettedgui, Eli, Duncan, William, Henry, David, Jellema, Willem, van de Stadt, H.   +8 more
openaire   +2 more sources

Discussion on Reciprocity, Unitary Matrix, and Lossless Multiple Beam Forming Networks

International Journal of Antennas and Propagation, 2015
The Lorentz reciprocity theorem enables us to establish that the transmitting and receiving patterns of any antenna are identical, provided some hypotheses on this antenna and the surrounding medium are satisfied.
Nelson Jorge G. Fonseca
doaj   +1 more source

Ka‐band coupled‐resonator bandpass filter based on printed ridge gap waveguide for millimetre‐wave application

Electronics Letters, 2021
A low‐loss Ka‐band coupled‐resonator bandpass filter based on the printed ridge gap waveguide (PRGW) technology is presented for millimetre‐wave communication applications.
Xiaojun Hu, Feng Xu
doaj   +1 more source

A novel 24 GHz circularly polarised metasurface rectenna

IET Microwaves, Antennas & Propagation, 2023
A novel 24 GHz circularly polarised metasurface rectenna for wireless power transmission is designed in this study. Based on experimental measurements and retro‐simulation, an effective approach is proposed to extract the parasitic parameters of a ...
Wei Huang, Jinxin Du, Xue‐Xia Yang, Wenquan Che, Steven Gao   +4 more
doaj   +1 more source

Empirical Study of Near Ground Propagation in Forest Terrain for Internet-of-Things Type Device-to-Device Communication

IEEE Access, 2018
This paper presents continuous-wave power measurements conducted in forest terrain with a focus on path-loss in a device-to-device (D2D) communication scenario.
Johannes Hejselbaek, Jesper Odum Nielsen, Wei Fan, Gert Frolund Pedersen   +3 more
doaj   +1 more source