Corrections to &amp;#8220;Optically Beamformed Beam-Switched Adaptive Antennas for Fixed and Mobile Broadband Wireless Access Networks&amp;#8221;

Piqueras, M.A.; Großkopf, G.; Vidal, B.; Herrera, J.; Martínez, J.M.; Sanchís, Pablo; Polo, V.; Corral, J.L.; Marceaux, A.; Galiere, J.; Lopez, J.; Enard, A.; Valard, J.-L.; Parillaud, O.; Estebe, E.; Vodjdani, N.; Choi, Moon-Soon; Besten, J.H. den; Soares, Francisco; Smit, M.K.; Martí, J.

doi:10.1109/tmtt.2006.877053

Cited by 7 publications

(14 citation statements)

References 2 publications

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“…Most previously proposed optical beamformer systems are either based on optical phase shifters [12] or switchable delay matrices [13]. However, phase shifters do not provide true time delay (TTD), and therefore result in a frequency-dependent beam angle and shape (beam squint).…”

Section: Development Of Optical Beamformermentioning

confidence: 99%

Broadband Conformal Phased Array with Optical Beam Forming for Airborne Satellite Communication

Schippers

Verpoorte

Jorna

et al. 2008

2008 IEEE Aerospace Conference

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For enhanced communication on board an aircraft, novel antenna systems with broadband satellitebased capabilities are required. The technology will enhance airline operations by providing in-flight connectivity for flight crew information and will bring live TV and highspeed Internet connectivity to passengers. The installation of such systems on board an aircraft requires for aerodynamic reasons the development a very low-profile aircraft antenna, which can point to satellites anywhere in the upper hemisphere. To this end, phased array antennas which are conformal to the aircraft fuselage are attractive. In this paper, two key aspects of conformal phased array antenna arrays are addressed: the development of a broadband Ku-band antenna and an optical beam forming network for tracking satellites. The antenna elements of the conformal array are stacked patch antennas with dual linear polarization which have sufficient bandwidth. For tracking an optical circuit is proposed that consists of a cascade of optical ring resonators. 12

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Section: Development Of Optical Beamformermentioning

confidence: 99%

Broadband Conformal Phased Array with Optical Beam Forming for Airborne Satellite Communication

Schippers

Verpoorte

Jorna

et al. 2008

2008 IEEE Aerospace Conference

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“…sidering Gaussian beams, the electric field at a radial distance from the beam centre and a distance from its waist, is given by (12) where is the electric field amplitude, is the beam waist, is the beam width, is the radius of curvature and is the longitudinal phase delay. The electric field variation with radius was represented at a distance (Fig.…”

Section: B Beam-channel Crosstalkmentioning

confidence: 99%

“…There are two main approaches to optically control phased-array antennas. TTD systems [8]- [12] provide large bandwidth but usually require long free-space sections that imply inevitably diffraction and loss issues, bounding this solution to the control of small antenna arrays. On the other hand, phase control systems [13] exploit the parallelism of free-space and so are normally more compact but pose critical beam squint problems, limiting this approach to small bandwidth applications.…”

Section: Introductionmentioning

confidence: 99%

Optically Beamformed Wideband Array Performance

Jofre

Stoltidou²,

Blanch

et al. 2008

IEEE Trans. Antennas Propagat.

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Abstract-Optical beamforming networks (OBFNs) are an interesting alternative for the design of wideband antenna arrays, mainly due to their low losses and weight, their high parallel processing capabilities and their electromagnetic immunity. Nevertheless, for a practical implementation, different technological and architectural tradeoffs need to be assessed. In this paper, the performance of an OBFN system is analytically studied and experimentally demonstrated. The study forms part of the optical beamforming network project, a multigroup research project supported by the European Space Agency (ESA). Differently from bulky free-space geometries, the architecture is based on fiber-optic delay lines for the time delays generation and on a spatial light modulator for the phase shifts generation. Experimental results for an X-band prototype are provided, showing beam steering accuracy, multibeam capability, amplitude distribution weighting and wideband operation.Index Terms-Microwave photonics, optical beamforming, phased array antennas, spatial light modulator (SLM).

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“…The techniques other than these are based on optical phase shifters [9], switchable delay matrices [10][11][12][13][14], liquid crystal polarization switching devices [15], a combination of a wavelength-tunable laser and a dispersive optical element, such as a high dispersion fiber [16,17], a fiber optic prism [18,19], a fiber Bragg gratings (FBGs) prism [20][21][22], or chirped FBGs [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Photonic True-Time Delay for Phased-Array Antenna System using Dispersion Compensating Module and a Multiwavelength Fiber Laser

Jeon¹,

Lee²

2014

Journal of the Optical Society of Korea

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An optical true-time delay beam-forming system using a tunable dispersion compensating module (DCM) for dense-wavelength division modulation (DWDM) and a multiwavelength fiber ring laser for a phased array antenna is proposed. The multiwavelength fiber ring laser has one output that includes four wavelengths; and four outputs that include only single-wavelength. The advantage of such a multiwavelength fiber ring laser is that it minimizes the number of devices in the phased array antenna system. The time delays according to wavelengths, which are assigned for each antenna element, are obtained from the tunable DCM. The tunable DCM based on a temperature adjustable Fabry-Perot etalon is used. As an experimental result, a DCM could be used to obtain the change of the beam angle by adjusting the dispersion value of the DCM at the fixed lasing wavelengths of the fiber ring laser in the proposed optical true-time delay.

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Corrections to “Optically Beamformed Beam-Switched Adaptive Antennas for Fixed and Mobile Broadband Wireless Access Networks”

Cited by 7 publications

References 2 publications

Broadband Conformal Phased Array with Optical Beam Forming for Airborne Satellite Communication

Broadband Conformal Phased Array with Optical Beam Forming for Airborne Satellite Communication

Optically Beamformed Wideband Array Performance

Photonic True-Time Delay for Phased-Array Antenna System using Dispersion Compensating Module and a Multiwavelength Fiber Laser

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