Analytic Analysis of Transient Radiation From Phased Array Antennas in the Near- and Far-Field Focus Applications

Tuan, Shih‐Chung; Chou, Hsi‐Tseng

doi:10.1109/tap.2013.2244549

Cited by 7 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Leaky-wave lens is another type of well-studied configuration to achieve near-field focusing [9][10][11]. Many researchers take advantage of planar antenna array (composed of microstrip elements, for instance) to achieve focusing in the near-zone [12][13][14][15][16][17][18][19][20]. Compared to the above methods, retro-reflective beamforming technique focuses electromagnetic fields with the aid of pilot signal such that the focal point coincides with the location from which the pilot signal is broadcasted, thus is more suitable for wireless power transmission applications [3,21,22].…”

Section: Introductionmentioning

confidence: 99%

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Wang¹,

Ruan²,

Lu³

2016

PIER

View full text Add to dashboard Cite

Abstract-This paper studies the difference between retro-directive beamforming technique and retroreflective beamforming technique in the context of wireless power transmission applications. In all of our studies, a wireless power receiver broadcasts continuous-wave pilot signal; the wireless power transmitter receives and analyzes the pilot signal; finally, the wireless power transmitter transmits continuous-wave power with phase profile conjugate to that of the received pilot signal. Our study demonstrates that a linear equi-spaced antenna array configuration employed by the wireless power transmitter behaves as a retro-directive beamformer when the wireless power receiver resides in the far-zone of the wireless power transmitter, whereas it behaves as a retro-reflective beamformer when the wireless power receiver is not in the far-zone. This paper further investigates two types of array configurations other than linear equi-spaced array when the wireless power transmitter behaves as a retro-reflective beamformer. One is a V-shaped array, which is obtained by deforming the linear equi-spaced array to a "V" shape. The other is termed "perturbed array:" on the basis of linear equi-spaced array, all the elements' locations are perturbed randomly. It is particularly interesting to compare the equi-spaced array and perturbed array. When the wireless power receiver resides 5 or 6 wavelengths away, a 6-element equi-spaced array and a 6-element perturbed array produce the same power level at the near-zone focal point, but the maximum far-zone gain associated with the perturbed array is 1 dB lower than the equi-spaced array. All the conclusions drawn in this paper are supported by numerical results as well as experimental results.

show abstract

Section: Introductionmentioning

confidence: 99%

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Wang¹,

Ruan²,

Lu³

2016

PIER

View full text Add to dashboard Cite

show abstract

“…Circular NFAs were also analyzed in LemaitreAuger et al (2013) and Siragusa et al (2009). Transient phenomena of finite NFAs were investigated in Tuan and Chou (2013). By applying the Poission sum formula, Floquet modes were generated for a one-dimensional infinite NFA in Chou (2013) and for twodimensional infinite NFAs in Chou (2013a).…”

Section: Introductionmentioning

confidence: 99%

“…Transient phenomena of finite NFAs were investigated in Tuan and Chou (2013). By applying the Poission sum formula, Floquet modes were generated for a one-dimensional infinite NFA in Chou (2013) and for twodimensional infinite NFAs in Chou (2013a). In Chou (2013b), the focus point of a onedimensional infinite NFA was further extended to complex space.…”

Section: Introductionmentioning

confidence: 99%

Radiation Characteristics of Floquet Mode over Two-Dimensional Infinite Near-Field Focusing Antenna with Focus Point in Complex Space

Yang

Ouyang

et al. 2015

Electromagnetics

View full text Add to dashboard Cite

In this article, the near field of a two-dimensional infinite near-field focusing antenna with Gaussian taper excitation is determined. By Gabor representation, any slowly varying excitation of array antenna can be expanded to series of Gaussian taper excitation. To achieve the Gaussian taper excitation, the focus point of a twodimensional infinite near-field focusing antenna is placed in complex space. By adopting the Poission sum formula, radiation fields of this type antenna are transferred to terms of Floquet modes. Asymptotic evaluation technique is utilized to calculate the Floquet mode integral in closed form. Results of asymptotic evaluation are compared with those obtained by direct numerical integral, and good agreement is achieved.

show abstract

“…The works presented in this paper perform a systematic investigation over the scattering problems, and extend the application scope to treat the reflectarray‐ and transmitarray‐type antenna structures, where the array elements are periodically distributed with different elemental structures to account for the needs of phase changes in the designs of these two types of array structure. In particular, we assume the scattering fields will focus at the near zone of array aperture [ Chou et al , ; Chou , , ; Karimkashi and Kishk , ; Buffi et al , ; Tuan and Chou , ] to resemble the characteristics of flat elliptical reflector and flat bifocal lens antennas, which have two focal points in principles and allow the energy of antenna radiation to focus at any point of interest. Thus, the solutions are very general in contrast to the solution of special case in Felsen and Ribas [].…”

Section: Introductionmentioning

confidence: 99%

Floquet modes-based asymptotic analysis of scattering from FSS-type reflectarray/transmitarray for near-zone-focused radiations

Chou

Tuan

2015

Radio Sci.

Self Cite

View full text Add to dashboard Cite

This paper presents the asymptotic formulation of ray fields in the decomposition of electromagnetic (EM) scattering mechanisms from a one-dimensional, semi-infinite, and periodic array when it is illuminated by a line source. This technique can be applied to analyze the passive FSS (frequency selective surface)-type periodic structures with identical elements, or the reflectarray-and transmitarray-type antennas that are phased to radiate EM fields focused in the near zone of the array aperture. The solutions are built up based on the Floquet mode expansion of the scattering fields and are obtained by asymptotically evaluating the resulted integrals to express the fields in terms of reflected/transmitted and edge diffracted fields as previously addressed in the framework of uniform geometrical theory of diffraction. The theoretical investigations over the scattering mechanisms and propagation phenomena are performed. Numerical examinations are presented to demonstrate the utilization of these solutions.The asymptotic techniques were successfully applied to treat the array problems with most works focused on the radiation problems of phased array antennas [Neto et al.

show abstract

Analytic Analysis of Transient Radiation From Phased Array Antennas in the Near- and Far-Field Focus Applications

Cited by 7 publications

References 32 publications

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Radiation Characteristics of Floquet Mode over Two-Dimensional Infinite Near-Field Focusing Antenna with Focus Point in Complex Space

Floquet modes-based asymptotic analysis of scattering from FSS-type reflectarray/transmitarray for near-zone-focused radiations

Contact Info

Product

Resources

About