Decoupling mechanism for improving the radiation gain of an AOA estimation circular array antenna

2017 ◽  
Author(s):  
Daishi Iwamoto ◽  
Kazuhiro Honda ◽  
Koichi Ogawa
Keyword(s):  
Array Antenna ◽  
Circular Array ◽  
Decoupling Mechanism ◽  
Circular Array Antenna

scholarly journals Synthesis of Circular Array Antenna for Sidelobe Level and Aperture Size Control Using Flower Pollination Algorithm

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
V. S. S. S. Chakravarthy Vedula ◽  
S. R. Chowdary Paladuga ◽  
M. Rao Prithvi
Keyword(s):  
Array Antenna ◽  
Computational Time ◽  
Flower Pollination Algorithm ◽  
Side Lobe Level ◽  
Aperture Size ◽  
Circular Array ◽  
Sidelobe Level ◽  
Beam Scanning ◽  
Flower Pollination ◽  
Circular Array Antenna

Sidelobe level suppression is a major problem in circular array antenna (CAA) synthesis. Many conventional numerical techniques are proposed to achieve this which are time consuming and often fail to handle multimodal problems. In this paper, a method of circular array synthesis using nature inspired flower pollination algorithm (FPA) is proposed. The synthesis technique considered here adapts one and two degrees of freedom, namely, amplitude only and amplitude spacing. The effectiveness of the FPA is studied by comparing the results with genetic algorithm (GA) and uniform circular array antenna (UCAA) with uniform spacing. Also the effect of additional degree of freedom on the aperture size and the computational time is analyzed. A relative side lobe level (SLL) of −25 dB is achieved using the algorithm under both no beam scanning (0°) and beam scanning (15°) conditions for 20 and 40 elements of CAA.

Step-scanned circular-array antenna

1970 ◽  
Vol 18 (5) ◽  
pp. 590-595 ◽  
Author(s):  
J. Boyns ◽  
C. Gorham ◽  
A. Munger ◽  
J. Provencher ◽  
J. Reindel ◽  
...  
Keyword(s):  
Array Antenna ◽  
Circular Array ◽  
Circular Array Antenna

Research on Beamforming Technique for Communications in Moving of Warship Circular Array Antenna

2012 ◽  
Vol 241-244 ◽  
pp. 2295-2298
Author(s):  
Qing Hua Wu ◽  
An Qing Zhang
Keyword(s):  
Antenna Array ◽  
Array Antenna ◽  
Beam Forming ◽  
Circular Array ◽  
Null Steering ◽  
Beam Directivity ◽  
Beamforming Technique ◽  
Maximum Directivity ◽  
Circular Array Antenna ◽  
Circular Antenna Array

Uniform circular antenna array of warship can bring beam and interference null steering from 360° symmetry without rotating. Directional communications can be achieved by UCA geometry. To solve the problem that warship’s stance is changed dynamically in course of sailing, a method was suggested that the electricity phases of UCA elements were changed based on information of stance about longitudinal sway, transverse sway and course. The proposed method can change beam directivity, and ensure providing a very directive pattern with stabilization, so that warships communication in moving each other. An expression of array maximum directivity forming with dynamic is proposed for UCA antenna. The simulation demonstrates that the beam forming method of communications in moving is validity, and is worth using with wide application.

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