Wavelength-compensated photonic multibeam-forming system for two-dimensional wideband radio-frequency phased-array antennas

2009 ◽  
Vol 48 (22) ◽  
pp. E1 ◽  
Author(s):  
Lu Gao ◽  
Kelvin H. Wagner
Keyword(s):  
Radio Frequency ◽  
Phased Array ◽  
Two Dimensional ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Wideband Radio

Space-time processing for «range – azimuth – elevation» measurements in non-cooperative systems of radars with phased array antennas

2021 ◽  
Author(s):  
V.V. Chapursky ◽  
A.A. Filatov ◽  
D.E. Koroteev
Keyword(s):  
Phased Array ◽  
Elevation Angle ◽  
Two Dimensional ◽  
Time Processing ◽  
Correlation Integral ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Straight Line Parallel ◽  
Straight Line ◽  
Line Parallel

The methods of measuring the three coordinates of an aircraft in the takeoff and landing mode on the runway of airfields based on the use of non - cooperative two-and three-position systems of radars with phased array antennas are considered. For these variants, general analytical expressions are obtained for the complex generalized correlation integral of space – time processing in the function of spatial coordinates, taking into account the individual directional pattern of phased array antennas. On the basis of two – dimensional profiles of the correlation integral modules «range – elevation» and «azimuth – elevation», examples of comparing particular variants of two-position and three-position systems of radars with their location on one straight line parallel runway are given. In conditions of large signal-to-noise ratios, power-law nonlinear transformations of the correlation integral correlation integral module are applied to reduce the level of side lobes in the two – dimensional sections «range – elevation» and «azimuth – elevation». The following results are obtained using examples. Two-dimensional diagrams of the correlation integral module «range – elevation» do not depend on the azimuth of the aircraft in the range of azimuth values β=0…10 ̊ and correctly display the angle of elevation and the range of the aircraft when 2…3 radars of a non-cooperative system are located on the straight line parallel runway. The two-dimensional diagrams of the correlation integral module «azimuth – elevation angle» have an interference structure, and the number and level of their side lobes increase with increasing azimuth of the aircraft. With azimuth β≥10 ̊, this can lead to ambiguity in the measurement of the azimuth and uncertainty in the elevation angle . One of the measures to reduce the side level of the diagrams of the correlation integral module can be the use of a power-law transformation of normalized diagrams exponentiation of degree 3...4. An increase in the number of radars from two to three when they are located on one straight line parallel to the runway led to a decrease in the side lobes level of the «range – elevation angle» and «azimuth – elevation angle» diagrams. In this case, it may be advisable to solve the problem of optimal choice of the position of the intermediate radar on the same straight line. Calculations were also carried out for an additional example of the location of the intermediate radar of a 3-position system with its removal from the base line. At the same time, there was an increase of the side lobes level in the «azimuth – elevation angle» sections, which in the future may require additional research in terms of optimizing the placement of the radars in horizontal plane for such a radar systems.

Two-dimensional optical architectures for the receive mode of phased-array antennas

1999 ◽  
Vol 38 (14) ◽  
pp. 3105 ◽  
Author(s):  
Luc Pastur ◽  
Sylvie Tonda-Goldstein ◽  
Daniel Dolfi ◽  
Jean-Pierre Huignard ◽  
Thomas Merlet ◽  
...  
Keyword(s):  
Phased Array ◽  
Two Dimensional ◽  
Phased Array Antennas ◽  
Array Antennas

scholarly journals Opto-VLSI-Based Beamformer for Radio-Frequency Phased-Array Antennas

2012 ◽  
Vol 4 (3) ◽  
pp. 912-919 ◽  
Author(s):  
F. Xiao ◽  
B. Juswardy ◽  
K. Alameh ◽  
S. Xiao ◽  
W. Hu
Keyword(s):  
Radio Frequency ◽  
Phased Array ◽  
Phased Array Antennas ◽  
Array Antennas

Side-lobe Level Reduction in Two-dimensional Optical Phased Array Antennas

2018 ◽  
Author(s):  
Julián L. Pita ◽  
Ivan Aldaya ◽  
Octávio J. S. Santana ◽  
Luís E. E. de Araujo ◽  
Paulo Dainese ◽  
...  
Keyword(s):  
Phased Array ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Two Dimensional ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Optical Phased Array ◽  
Level Reduction

scholarly journals Defining Effective Gain for Evaluation of Orbital Angular Momentum Links

2021 ◽  
Vol 6 (2) ◽  
pp. 117-127
Author(s):  
Elaheh Shamoushaki ◽  
Hadi Aliakbarian
Keyword(s):  
Angular Momentum ◽  
Radio Frequency ◽  
Radiation Pattern ◽  
Orbital Angular Momentum ◽  
Phased Array ◽  
Communication Link ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Link Budget ◽  
First Time

In this paper, a communication link based on circular phased array antennas generating orbital angular momentum (OAM) beams at radio frequency is investigated. The presence of a null in the radiation pattern of OAM antennas is the main drawback of them. This problem makes it difficult to establish a telecommunication link using OAM systems and calculate the link budget for such a system. To solve this problem, we have defined two new gain parameters by using Friis Transmission Equation. The new formulas can help to calculate the effective gain of OAM antennas. Also, we have defined the effective OAM gain in detail for the first time in order to evaluate the performance of the OAM links. By using the proposed formulas, a capable and secure link based on the orthogonality of OAM beams can be designed.

Floquet-based FDTD analysis of two-dimensional phased array antennas

1994 ◽  
Vol 4 (4) ◽  
pp. 109-111 ◽  
Author(s):  
J. Ren ◽  
O.P. Gandhi ◽  
L.R. Walker ◽  
J. Fraschilla ◽  
C.R. Boerman
Keyword(s):  
Phased Array ◽  
Two Dimensional ◽  
Phased Array Antennas ◽  
Array Antennas

Optical true time-delay for two-dimensional phased array antennas using compact fiber grating prism

2013 ◽  
Vol 11 (10) ◽  
pp. 100606-100609 ◽  
Author(s):  
Yongfeng Wei Yongfeng Wei ◽  
Chaowei Yuan Chaowei Yuan ◽  
Shanguo Huang Shanguo Huang ◽  
Xinlu Gao Xinlu Gao ◽  
Jing Zhou Jing Zhou ◽  
...  
Keyword(s):  
Time Delay ◽  
Phased Array ◽  
Fiber Grating ◽  
Two Dimensional ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
True Time Delay ◽  
True Time
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