Phased array theory and technology

Mailloux, Robert J.

doi:10.1109/proc.1982.12285

Cited by 207 publications

(60 citation statements)

References 101 publications

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“…Thus, in order to transmit collimated microwaves over a long range, D needs to be increased with numbers of the scatterers. After passing through that range, the beam begins to diverge with a 3 dB beam-angle, θ w , given as follows [11].…”

Section: Directivity Formingmentioning

confidence: 99%

3D Beamforming Coupler for 2D Waveguides Using Dielectric Scatterer Array

Monnai

Shinoda

2011

SICE Journal of Control, Measurement, and System Integration

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: We propose a novel directional antenna device that couples 2D guided microwaves with 3D radiated beams. It consists of a dielectric scatterer array aligned in two-dimensional periodicity on a planar surface-waveguide. Each scatterer radiates a portion of the incident guided wave in a location-dependent linear phase delay. Therefore, the directivity of the synthesized scattered wave is controllable by tuning the period of the scatterers. We derive a guideline to design the scatterer pattern for beamforming and verify it with numerical simulations. Since the proposed method works reversibly both on sending and receiving, microwave paths for wireless communication and sensing can be designed smartly.

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Section: Directivity Formingmentioning

confidence: 99%

3D Beamforming Coupler for 2D Waveguides Using Dielectric Scatterer Array

Monnai

Shinoda

2011

SICE Journal of Control, Measurement, and System Integration

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“…The fixed control sequence study focuses on applications with fixed control streams such as in the use of Gaussian elimination in solving systems of linear equations, which is important for null steering in phased array radai applications [2,3]. This aspect of the Phase I effort is an extension of a Phase I Rome Laboratory (RL) SBIR contract (F30602-90-C-008 1, project engineer is Robert Kaminski, 315-330-4092) performed by TIS which involved the design of an architecture for a digital optical Gaussian elimination processor.…”

Section: Statement Of Work Timetable and Schedule Of Reportsmentioning

confidence: 99%

Novel Optical Computer Architecture Utilizing Reconfigurable Interconnects

Murdocca¹,

Gerasoulis²,

Levy³

1991

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Unlimited distribution ABSTRACT (Maxrnim 200 words)This final report describes progress made by TIS Incorporated for the period 7/1/91 -10/1/91 on SBIR contract F49620-9 1 -C-0055 toward the development of novel optical computer architectures and supporting methods for exploiting free-space reconfigurable interconnects. Major findings include: (1) Reconfigurable interconnects can reconfigure slower than the bit rate and still improve performance as long as throughput is maintained after reconfiguration; (2) A fixed control sequence does not preclude the use of runtime conditionals, so that the performance of traditional general purpose computing can be improved; (3) A system that uses reconfigurable interconnects is likely to be larger than a functionally equivalent system that does not use reconfigurable interconnects; (4) A reconfigurable approach is most effective for a small active portion of a computer, and is not needed for an entire computer in order to appreciate a performance gain; (5) A reconfigurable interconnect S technology can have a significant impact on interconnection networks used in parallel processors; (6) A fixed control sequence must have some level of repetition in order to be practical; and (7) The dataflow model of computing, which theoretically supports maximum parallelism but suffers performance sacrifices in electronic implementations, may be significantly improved since the architecture can be modified to suit the dataflow graph. 299-01 GENERAL INSTRUCTIONS FOR COMPLETING SF 298The Report Documentation Page (RDP) is used in announcing and cataloging reports. It is important that this information be consistent with the rest of the report, particularly the cover and title page. Instructions for filling in each block of the form follow. It is important to stay within the lines to meet optical scanning requirements. ABSTRACT This final report describes progress made by TIS Incorporated for the period 7/1/91 -10/1/91 on SBIR contract F49620-91-C-0055 toward the development of novel optical computer architectures and supporting methods for exploiting free-space reconfigurable interconnects.Major findings include: (1) Reconfigurable interconnects can reconfigure slower than the bit rate and still improve performance as long as throughput is maintained after reconfiguration; (2) A fixed control sequence does not preclude the use of runtime conditionals, so that the performance of traditional general purpose computing can be improved; (3) A system that uses reconfigurable interconnects is likely to be larger than a functionally equivalent system that does not use reconfigurable interconnects; (4) A reconfigurable approach is most effective for a small active portion of a computer, and is not needed for an entire computer in order to appreciate a performance gain; (5) A reconfigurable interconnect technology can have a significant impact on interconnection networks used in parallel processors; (6) A fixed control sequence must have some level of repetition in order to be practical; and (7) ...

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“…Many different types of antennas can be used to obtain high gain performances, such as a reflector antenna or an array of antennas [1,2]. In the case of a reflector antenna, the required optimum focus length makes these antennas bulky.…”

Section: Introductionmentioning

confidence: 99%

The Gain Estimation of a Fabry-Perot Cavity (FPC) Antenna with a Finite Dimension

Kwon

Lee

2017

J Electromagn Eng Sci

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In this paper, we have presented an equation for estimating the gain of a Fabry-Perot cavity (FPC) antenna with a finite dimension. When an FPC antenna has an infinite dimension and its height is half of a wavelength, the maximum gain of that FPC antenna can be obtained theoretically. If the FPC antenna does not have a dimension sufficient for multiple reflections between a partially reflective surface (PRS) and the ground, its gain must be less than that of an FPC antenna that has an infinite dimension. In addition, the gain of an FPC antenna increases as the dimension of a PRS increases and becomes saturated from a specific dimension. The specific dimension where the gain starts to saturate also gets larger as the reflection magnitude of the PRS becomes closer to one. Thus, it would be convenient to have a gain equation when considering the dimension of an FPC antenna in order to estimate the exact gain of the FPC antenna with a specific dimension. A gain versus the dimension of the FPC antenna for various reflection magnitudes of PRS has been simulated, and the modified gain equation is produced through the curve fitting of the full-wave simulation results. The resulting empirical gain equation of an FPC antenna whose PRS dimension is larger than 1.50 has been obtained. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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Phased array theory and technology

Cited by 207 publications

References 101 publications

3D Beamforming Coupler for 2D Waveguides Using Dielectric Scatterer Array

3D Beamforming Coupler for 2D Waveguides Using Dielectric Scatterer Array

Novel Optical Computer Architecture Utilizing Reconfigurable Interconnects

The Gain Estimation of a Fabry-Perot Cavity (FPC) Antenna with a Finite Dimension

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