Results 1 to 10 of about 71,865 (181)

Optimum Antenna Characteristics for Maximally Harvesting Ambient RF Energy

open access: yesIEEE Open Journal of Antennas and Propagation, 2022
This paper investigates the best antenna characteristics to harvest ambient RF waves maximally. The proposed approach analyzes and compares key design aspects, including multi-polarization, multi-port, multi-band, omnidirectional, quasi-isotropic, and ...
Constant M. A. Niamien
doaj   +1 more source

Band K Satellite Receiver Signal and Radio Locator

open access: yesScientific Journal of Gdynia Maritime University, 2022
The last dozen or so years has seen significant and dynamic development in satellite technologies. Devices using satellites circulating in space for the purposes of general communication have ceased to be the domain of a narrow group of recipients ...
Marian Wnuk
doaj   +1 more source

A Review on Antenna Technologies for Ambient RF Energy Harvesting and Wireless Power Transfer: Designs, Challenges and Applications

open access: yesIEEE Access, 2022
Radio frequency energy harvesting (RFEH) and wireless power transmission (WPT) are two emerging alternative energy technologies that have the potential to offer wireless energy delivery in the future.
Md. Amanath Ullah   +5 more
doaj   +1 more source

Degrees of Freedom of a K-User Interference Channel in the Presence of an Instantaneous Relay

open access: yesEntropy, 2022
In this paper, we study the degrees of freedom (DoF) of a frequency-selective K-user interference channel in the presence of an instantaneous relay (IR) with multiple receiving and transmitting antennas.
Ali H. Abdollahi Bafghi   +2 more
doaj   +1 more source

Analysis of the Borehole Effect in Borehole Radar Detection

open access: yesSensors, 2020
The directional borehole radar can accurately locate and image the geological target around the borehole, which overcomes the shortcomings that the conventional borehole radar can only detect the depth of the target and the distance from the borehole ...
Wentian Wang   +3 more
doaj   +1 more source

The Approximate Capacity of the MIMO Relay Channel [PDF]

open access: yes, 2014
Capacity bounds are studied for the multiple-antenna complex Gaussian relay channel with t1 transmitting antennas at the sender, r2 receiving and t2 transmitting antennas at the relay, and r3 receiving antennas at the receiver.
Jin, Xianglan, Kim, Young-Han
core   +1 more source

Absorption efficiency of receiving antennas [PDF]

open access: yesIEEE Transactions on Antennas and Propagation, 2005
Udgivelsesdato ...
Andersen, Jørgen Bach, Frandsen, Aksel
openaire   +2 more sources

Experimental study of depolarization and antenna correlation in tunnels in the 1.3 GHz band [PDF]

open access: yes, 2019
Measurements have been carried out in a low-traffic road tunnel to investigate the influence of the polarization of the transmitting and receiving antennas on the channel characteristics. A real-time channel sounder working in a frequency band around 1.3
Challita, Frederic   +5 more
core   +4 more sources

WLAN/WDS performance using directive antennas in highly mobile scenarios: experimental results [PDF]

open access: yes, 2008
This paper presents experimental results from a series of IEEE 802.11g studies to investigate the performance of vehicular to roadside wireless communications. In particular, two high-gain omni-directional antennas were used at the roadside access point,
Nix, AR, Zaggoulos, G
core   +2 more sources

Novel MIMO-SAR system applied for high-speed and high-accuracy deformation measurement

open access: yesThe Journal of Engineering, 2019
As a novel system, multiple-input multiple-output synthetic aperture radar (MIMO-SAR) has achieved rapid development in the past years. Based on the MIMO technique, multiple transmitting and receiving antennas could be utilised to compose a specific ...
Cheng Hu   +4 more
doaj   +1 more source

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