Results 91 to 100 of about 300,396 (142)

5G-enabled, battery-less smart skins for self-monitoring megastructures and digital twin applications. [PDF]

Sci Rep
Lynch C, Adeyeye A, Abbara EM, Umar A, Alhendi M, Minnella C, Iannotti J, Stoffel N, Poliks M, Tentzeris MM.   +9 more
europepmc   +1 more source

Towards net zero: A technological review on the potential of space-based solar power and wireless power transmission. [PDF]

Heliyon
Alam KS, Kaif AMAD, Das SK, Abhi SH, Muyeen SM, Ali MF, Tasneem Z, Islam MM, Islam MR, Badal MFR, Ahamed MH, Sarker SK, Das P, Hasan MM.   +13 more
europepmc   +1 more source

Use of an active retrodirective antenna array as a multipath sensor

IEEE Microwave and Guided Wave Letters, 1997
The use of an active retrodirective antenna as an indicator of multipath propagation effects is investigated by the authors. It is shown that the flat azimuthal gain response normally associated with a retrodirective antenna array can be significantly modified by the presence of multipath signals. These signals act as secondary sources impinging on the
V F Fusco
exaly   +5 more sources

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Reflector effects on the performance of a retrodirective antenna array

IEEE Transactions on Antennas and Propagation, 2000
This paper presents modeling strategies to determine the operating characteristics of a heterodyne phase-conjugate retrodirective Van Atta (1959) array in the presence of a plane reflector. The models used are based on physical and geometrical optics principles.
V F Fusco
exaly   +3 more sources

Retrodirective Antenna Spatial Data Protection

IEEE Antennas and Wireless Propagation Letters, 2009
In this letter, we show how a 2.4-GHz retrodirective array operating in a multipath rich environment can be utilized in order to spatially encrypt digital data. For the first time, we give experimental evidence that digital data that has no mathematical encryption applied to it can be successfully recovered only when it is detected with a receiver that
Fusco, Vincent, Buchanan, Neil
openaire   +3 more sources

Retrodirective array design using ring antenna

2011 IEEE International Symposium on Antennas and Propagation (APSURSI), 2011
This paper presents a microstrip 4×8 retrodirective array which consists of two 4×4 sub-arrays. These two 4×4 sub-arrays employ proximity-coupled microstrip ring antennas as the array elements. The design frequency of the ring antenna is 5.8 GHz and the antenna produces voltage standing wave ratio (VSWR) and axial ratio less than 1.5 and 1 dB ...
null Dong-Jin Jung, null Seongwon Oh, null Kai Chang   +2 more
exaly   +2 more sources

Circularly symmetric retrodirective antenna system

IEEE Transactions on Antennas and Propagation, 1971
A method is described by which automatically retrodirective performance may be obtained from circular arrays and circularly continuous aperture antennas. The method is also directly applicable to cylindrical antennas for two-dimensional retrodirectivity and is generalized to include a method for obtaining three-dimensional retrodirectivity.
exaly   +2 more sources

Development of an active retrodirective antenna with frequency conversion

Microwave and Optical Technology Letters, 2010
AbstractThe development of an active retrodirective antenna involving frequency conversion stages is presented.This retrodirective array of printed dipoles and regular commercial components is designed to operate at the GSM1900 band. Experimental measurements of monoestatic and biestatic responses are given, showing very good performance for a small ...
R. Flores‐Leal, H. Jardon‐Aguilar, A. Tirado‐Mendez   +2 more
exaly   +2 more sources

Retrodirective antenna array for circularly polarized wireless power transmission

2017 11th European Conference on Antennas and Propagation (EUCAP), 2017
In this paper, a retrodirective antenna (RDA) array for wireless power transmission (WPT) is presented. Applications include the charging of mobile device batteries wirelessly. Thanks to the principle of phase conjugation in mixers, retrodirectivity can be achieved in the far-field.
Pascual D. Hilario Re, Symon K. Podilchak, Samuel Rotenberg, George Goussetis, Jaesup Lee   +4 more
openaire   +2 more sources

Redirective and retrodirective antenna arrays

IEEE Transactions on Antennas and Propagation, 1969
The problem considered is the redirection of a time-varying signal from one specified point to another by a set of arbitrarily spaced antenna array elements. The necessary and sufficient condition for signal redirection is determined without restricting the analysis to a monochromatic signal.
E. Putzer, R. Ghose
openaire   +1 more source