Far-field power transmission by exploiting time-modulation in linear arrays

2015 ◽  
Author(s):  
Diego Masotti ◽  
Roman Marchukov ◽  
Vittorio Rizzoli ◽  
Alessandra Costanzo
Keyword(s):  
Power Transmission ◽  
Far Field ◽  
Linear Arrays ◽  
Time Modulation

Structure-Borne Power Transmission in Thin Naturally Orthotropic Plates: General Case

2003 ◽  
Vol 9 (10) ◽  
pp. 1189-1199 ◽  
Author(s):  
Nirmal Kumar Mandal ◽  
Roslan Abd. Rahman ◽  
M. Salman Leong
Keyword(s):  
Fourier Transform ◽  
Power Flow ◽  
Power Transmission ◽  
Far Field ◽  
Orthotropic Plates ◽  
Flow Estimation ◽  
Structural Intensity ◽  
Vibration Power Flow ◽  
Conventional Idea ◽  
Bending Wave

The structural intensity technique is usually used to estimate vibration power flow in structures. This method is used to determine vibration power flow in thin naturally orthotropic plates. The bending wave is considered to find general vibration power transmission in the frequency domain that is not approximated by far field conditions. This intensity formulation defines power flow per unit width of the plates (W m−1) similar to that of the conventional idea. Power flow estimation is formulated using cross-spectra of field signals, facilitating the use of a fast Fourier transform analyzer.

scholarly journals A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hong Soo Park ◽  
Sun K. Hong
Keyword(s):  
Time Reversal ◽  
Power Transmission ◽  
Linear Array ◽  
Wireless Power Transfer ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Dynamic Propagation ◽  
Received Power ◽  
Indoor Scenarios

AbstractFor far-field wireless power transfer (WPT) in a complex propagation environment, a time-reversal (TR) based WPT that can overcome the drawbacks of conventional beamforming (BF) by taking advantage of multipath has been recently proposed. However, due to the WPT performance of BF and TR depending on the complexity of the propagation environment, the performance prediction between BF versus TR would be required. We present a detailed and generalized analysis of the recently proposed performance metric referred to as the peak received power ratio (PRPR) for linear array-based WPT. Here, the effectiveness of PRPR is verified via measurement for free space and indoor scenarios. The results demonstrate that PRPR is directly related to the complexity of the propagation environment and the corresponding power transmission capability of BF and TR. That is, the higher the complexity, the greater the value of PRPR and TR outperforms BF with higher peak power given the same average transmit power and vice versa. The mode decision between BF and TR based on PRPR potentially promises efficient far-field WPT even in a dynamic propagation environment.

Application of time modulation in the synthesis of sum and difference patterns by using linear arrays

2006 ◽  
Vol 48 (5) ◽  
pp. 829-832 ◽  
Author(s):  
J. Fondevila ◽  
J. C. Brégains ◽  
F. Ares ◽  
E. Moreno
Keyword(s):  
Linear Arrays ◽  
Time Modulation

Optimizing uniformly excited linear arrays through time modulation

2004 ◽  
Vol 3 ◽  
pp. 298-301 ◽  
Author(s):  
Fondevila ◽  
Bregains ◽  
Ares ◽  
Moreno
Keyword(s):  
Linear Arrays ◽  
Time Modulation

Study of Far—Field Directivity Pattern for Linear Arrays

2011 ◽  
Author(s):  
Chiselev Ana-Maria ◽  
Moraru Luminita ◽  
Onose Laura ◽  
Madalin Bunoiu ◽  
Iosif Malaescu
Keyword(s):  
Directivity Pattern ◽  
Far Field ◽  
Linear Arrays

Derivation of Far-field Gain Using a Gain Reduction Effect in the Fresnel Region

2020 ◽  
Vol 35 (10) ◽  
pp. 1137-1143
Author(s):  
Ilkyu Kim ◽  
Sun-Gyu Lee ◽  
Jeong-Hae Lee
Keyword(s):  
Power Transmission ◽  
Near Field ◽  
Separation Distance ◽  
Far Field ◽  
Preliminary Measurement ◽  
Microwave Antennas ◽  
Fresnel Region ◽  
Wide Range ◽  
Reduction Effect ◽  
Reference Parameters

A handy method of calculating far-field gain based on the magnitude of the power transmission in a Fresnel region is presented, which can be applied to the phaseless near-field measurement. Due to the short range inside an anechoic chamber, the probe antenna is often placed in the Fresnel region of the antenna under test (AUT). It is well-known that far-field gain of an antenna gradually reduces when one antenna moves to the other one placed in a proximity distance. This fact can be advantageously applied to estimate the far-field gain in a far-field region. The proposed method offers rapid estimation of the far-field gain based on the simple input knowledge such as the probe antenna gain and the magnitude of the power transmission and the separation distance between AUT and probe antenna. The proposed method can be applicable to a wide range of microwave antennas. This feature makes it possible to offer preliminary measurement results and reference parameters of the measurement for the various types of microwave antennas.

Prediction of Structure-Borne Sound in Orthotropic Plates for Far-Field Conditions

2002 ◽  
Vol 8 (1) ◽  
pp. 3-12 ◽  
Author(s):  
Nirmal Kumar Mandal ◽  
M. Salman Leong ◽  
R. Abd. Rahman
Keyword(s):  
Power Flow ◽  
Power Transmission ◽  
Field Conditions ◽  
Finite Difference Approximation ◽  
Wave Number ◽  
Total Power ◽  
Difference Approximation ◽  
Far Field ◽  
Orthotropic Plates ◽  
Structural Intensity

Structural intensity method is used to formulate vibration power flow model in naturally orthotropic plates in the frequency domain for far-field conditions considering bending waves. Dimensionless parameters are used in classical orthotropic plate equations to get this power. Techniques of Fourier transform and finite difference approximation are used in the formulation. Shear force components of vibration power transmission in x-direction and y-direction are obtained separately. Total power is obtained from the idea of far-field conditions. Cross-spectral density functions of field signal are used to facilitate the estimation of power transmission. Structural intensity is formulated, which is similar to that of the conventional two-transducer method. A transducer array of two points is required to get an intensity vector in one direction of a point in the plates. A new bending wave number and a modified Laplace operator are also proposed.

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