A study on the two-dimensional slotline coupling structure for active planar array antennas

2002 ◽  
Author(s):  
Tae Yune Lee ◽  
Young Joong Yoon ◽  
Gyu Sang Jang
Keyword(s):  
Two Dimensional ◽  
Array Antennas ◽  
Coupling Structure ◽  
Planar Array

scholarly journals Thermos Array: Two-Dimensional Sparse Array with Reduced Mutual Coupling

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Lei Sun ◽  
Minglei Yang ◽  
Baixiao Chen
Keyword(s):  
Closed Form ◽  
Degrees Of Freedom ◽  
Mutual Coupling ◽  
Doa Estimation ◽  
Two Dimensional ◽  
Spatial Smoothing ◽  
Planar Arrays ◽  
Half Wavelength ◽  
Planar Array ◽  
Small Spacing

Sparse planar arrays, such as the billboard array, the open box array, and the two-dimensional nested array, have drawn lots of interest owing to their ability of two-dimensional angle estimation. Unfortunately, these arrays often suffer from mutual-coupling problems due to the large number of sensor pairs with small spacing d (usually equal to a half wavelength), which will degrade the performance of direction of arrival (DOA) estimation. Recently, the two-dimensional half-open box array and the hourglass array are proposed to reduce the mutual coupling. But both of them still have many sensor pairs with small spacing d, which implies that the reduction of mutual coupling is still limited. In this paper, we propose a new sparse planar array which has fewer number of sensor pairs with small spacing d. It is named as the thermos array because its shape seems like a thermos. Although the resulting difference coarray (DCA) of the thermos array is not hole-free, a large filled rectangular part in the DCA can be facilitated to perform spatial-smoothing-based DOA estimation. Moreover, it enjoys closed-form expressions for the sensor locations and the number of available degrees of freedom. Simulations show that the thermos array can achieve better DOA estimation performance than the hourglass array in the presence of mutual coupling, which indicates that our thermos array is more robust to the mutual-coupling array.

Analysis and design methods of planar array antennas with slotted waveguides taking into account mutual coupling

1989 ◽  
Vol 72 (10) ◽  
pp. 103-110 ◽  
Author(s):  
Yoshihiko Konishi ◽  
Hitoshi Mizutamari ◽  
Shin-Ichi Sato ◽  
Seiji Mano ◽  
Takashi Katagi
Keyword(s):  
Mutual Coupling ◽  
Design Methods ◽  
Analysis And Design ◽  
Array Antennas ◽  
Planar Array

scholarly journals Design and Analysis of Novel Fractal Linear and Planar Array Antennas for Satellite Applications

2016 ◽  
Vol 5 (3) ◽  
pp. 56 ◽  
Author(s):  
V. A. Sankar ◽  
P. V. Y. Jayasree
Keyword(s):  
Design Methodology ◽  
Beam Width ◽  
Side Lobe ◽  
Circular Ring ◽  
Geometric Design ◽  
Side Lobe Level ◽  
Array Antennas ◽  
Repetitive Nature ◽  
Satellite Applications ◽  
Planar Array

This article proposed a new geometric design methodology for the systematic expansion of fractal linear and planar array antennas. Using this proposed geometric design methodology any deterministic polygon shape can be constructed. In this article, two element fractal linear and triangular array antennas are examined using proposed methodology up to four iterations of two expansion factors. Due to the repetitive nature of the proposed geometric design methodology, both linear and planar fractal arrays shows multi-beam behavior with excellent array factor properties. The behavior of the proposed arrays shows better performance than linear and planar fractal array antennas generated by concentric circular ring sub array geometric generator. Triangular planar fractal array of expansion factor two at fourth iteration achieved a single valued beam width of 3.80 with -31.6 side lobe level. The suggested fractal arrays are analyzed and simulated by MATLAB-13 programming.

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.

Beam-Shaping of Planar Array Antennas Using Integrated Attenuators

2007 ◽  
Author(s):  
Stephen Horst ◽  
Dimitrios E. Anagnostou ◽  
George E. Ponchak ◽  
Emmanouil Tentzeris ◽  
John Papapolymerou
Keyword(s):  
Beam Shaping ◽  
Array Antennas ◽  
Planar Array

scholarly journals Two-Dimensional Direction-of-Arrival Fast Estimation of Multiple Signals with Matrix Completion Theory in Coprime Planar Array

Sensors ◽  
2018 ◽  
Vol 18 (6) ◽  
pp. 1741 ◽  
Author(s):  
Haiyun Xu ◽  
Yankui Zhang ◽  
Bin Ba ◽  
Daming Wang ◽  
Xiangzhi Li
Keyword(s):  
Matrix Completion ◽  
Direction Of Arrival ◽  
Two Dimensional ◽  
Multiple Signals ◽  
Fast Estimation ◽  
Planar Array
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