A Beam Forming Method Based on Amplitude Weighting of Uniform Circular Array

2014 ◽  
Vol 989-994 ◽  
pp. 3722-3725
Author(s):  
Jin Lin Wang ◽  
Yong Qing Fu ◽  
Xue Liu
Keyword(s):  
Influence Factors ◽  
Side Lobe ◽  
New Method ◽  
Beam Forming ◽  
Side Lobe Level ◽  
Signal Model ◽  
Theoretical Derivation ◽  
Linear Arrays ◽  
Planar Array ◽  
Beam Directivity

The uniform circular planar array (UCA) has lots of advantages what linear arrays and other surface arrays don't have. However, because of its limitations, such as the high side-lobe level and low zero depth, the application on controlling array space direction by beam forming has been limited. Considering the characteristics of UCA, the receiving UCA's signal model is established in this paper. The influence factors of UCA's beam will be found out on the basis of theoretical derivation. A new method, that can improve the performance of the UCA beam directivity by amplitude weighting, is proposed in this paper. The theoretical derivation results and simulation results improved that the method could have a better ability in side-lobe suppression, and the new method could make the UCA to have a good application prospect.

scholarly journals Null Steering in Linear Arrays for Multiple Null Positions

2019 ◽  
Vol 8 (2) ◽  
pp. 2671-2674
Keyword(s):  
Side Lobe ◽  
Beam Forming ◽  
Side Lobe Level ◽  
The Novel ◽  
Optimization Strategy ◽  
Pattern Synthesis ◽  
Linear Arrays ◽  
Null Steering ◽  
Current Article ◽  
Social Group Optimization

In the current article, the linear array null pattern synthesis for beam forming applications is presented using the novel social group optimization algorithm(SGOA) . As a part of the simulation, the circular array of 24 element length is considered with a spacing of inter-elements of 0.5 λ is considered. These patterns are synthesized for null steering and side lobe level (SLL) optimization. Strategy of designing arrays with single and multiple nulls are presented in more robust manner in which the width of the beam and SLL are also included for objectives of design. Keywords : Beam forming, Null positioning , SGOA.

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.

scholarly journals Electronically Steered MIMO Patch Antenna with Conformal Feeding for 5 G Applications

2021 ◽  
Author(s):  
monish gupta
Keyword(s):  
Input Signal ◽  
Patch Antenna ◽  
Phase Shifter ◽  
Side Lobe ◽  
Power Divider ◽  
Main Beam ◽  
Beam Forming ◽  
Side Lobe Level ◽  
Mimo Antenna ◽  
Wilkinson Power Divider

Abstract Multiple input multiple output antenna is the key technology which enables the design of 5 G networks. In order to achieve desired beam forming and side lobe reduction capabilities, antennas used in MIMO technology are required to feed with signals having different phase and amplitude. It is possible to achieve variable phase shift and variable attenuation using phase shifter and amplitude limiters. However when these devices are used between source and antenna, they makes the system non planner and non-conformal. This research presents a 16 element, multiple user MIMO Patch antenna with conformal and planner power divider network to achieve electronically steered beam along with desired side lobe level reduction. Wilkinson power divider is used to achieve conformal and planner power divider for MIMO antenna. Desired beam forming capabilities are achieved by controlling the phase of input signal to antennas by controlling the length of microstripline and desired side lobe reduction capabilities are achieved by controlling the amplitude of input signal to antenna by controlling the width of microstrip line used in Wilkinson power divider. This provides an overall planner and conformal structure. In this research same antenna is used is generate two major beams by controlling the phase and amplitude of input signal. The achieved radiation pattern of designed antenna consists of one major beams having gain of 18 dB and located at theta equal to 100 and Phi equal to 1800. When phase of input signal to antennas are changed a major beam having gain of 18 dB and located at theta equal to 100 and Phi equal to 2700 is obtained. The side lobe level less than 13 dB of main beam is achieved using designed antenna. The designed structure is simulated and analyzed using HFSS. Simulated results for the designed MIMO antenna are verified by analyzing the fabricating structure using vector network analyzer and horn antenna.

scholarly journals An ADS-Based Sparse Optimization Method for Sonar Imaging Sensor Arrays

2020 ◽  
Vol 10 (9) ◽  
pp. 3176
Author(s):  
Jiancheng Liu ◽  
Feng Shi ◽  
Yecheng Sun ◽  
Peng Li
Keyword(s):  
Sensor Array ◽  
Linear Array ◽  
Imaging System ◽  
Low Cost ◽  
Sensor Arrays ◽  
Optimization Method ◽  
Low Complexity ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Linear Arrays

The Mills Cross sonar sensor array, achieved by the virtual element technology, is one way to build a low-complexity and low-cost imaging system while not decreasing the imaging quality. This type of sensor array is widely investigated and applied in sensor imaging. However, the Mills Cross array still holds some redundancy in sensor spatial sampling, and it means that this sensor array may be further thinned. For this reason, the Almost Different Sets (ADS) method is proposed to further thin the Mills Cross array. First, the original Mills Cross array is divided into several transversal linear arrays and one longitudinal linear array. Secondly, the Peak Side Lobe Level (PSLL) of each virtual linear array is estimated in advance. After the ADS parameters are matched according to the thinned ratio of the expectant array, all linear arrays are thinned in order. In the end, the element locations in the thinned linear array are used to determine which elements are kept or discarded from the original Mills array. Simulations demonstrate that the ADS method can be used to thin the Mills array and to further decrease the complexity of the imaging system while retaining beam performance.

ECCM AUXILIARY ANTENNA SYSTEM FOR A MULTIBEAM SAR ARRAY

2010 ◽  
Vol 19 (07) ◽  
pp. 1571-1578
Author(s):  
LEONARDO LUCCI
Keyword(s):  
Synthetic Aperture Radar ◽  
System Reliability ◽  
Side Lobe ◽  
Antenna System ◽  
Synthetic Aperture ◽  
Side Lobe Level ◽  
Planar Array ◽  
Single Block ◽  
Radar Antenna ◽  
Main Pattern

A SAR (Synthetic Aperture Radar) antenna typically consists of a large planar array to obtain a directive pattern with low side lobe level. A multibeam SAR system requires a set of secondary beams, implementing some additional features. To protect the SAR operation from possible jammers ECCM (Electronic Counter-Countermeasure) capabilities can be implemented requiring an auxiliary beam which cover the portion of main pattern to be protected. A possible architecture of this secondary antenna system is here presented by using a set of radiating elements combined together to obtain the ECCM channel. To minimize the feeding network complexity and to maximize the system reliability, the ECCM antenna is a cluster of circular corrugated horns, eventually realized as a single-block unit.

scholarly journals Optimization of Sparse Planar Arrays with Minimum Spacing and Geographic Constraints in Smart Ocean Applications

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 11
Author(s):  
Shijie Hao ◽  
Feng-Xiang Ge ◽  
Xianxiang Yu ◽  
Guolong Cui ◽  
Li Ma
Keyword(s):  
Simulated Annealing ◽  
Numerical Simulations ◽  
Side Lobe ◽  
High Peak ◽  
Side Lobe Level ◽  
Grating Lobe ◽  
Planar Arrays ◽  
Planar Array ◽  
Array Aperture ◽  
Level Reduction

Sparse arrays can fix array aperture with a reduced number of elements to maintain resolution while reducing cost. However, grating lobe suppression, high peak side-lobe level reduction (PSLL), and constraints on the location of the array elements in the practical deployment of arrays are challenging problems. Based on simulated annealing, the element locations of a sparse planar array in smart ocean applications with minimum spacing and geographic constraints are optimized in this paper by minimizing the sum of PSLL. The robustness of the deployment-optimized spare planar array with mis-calibration is further considered. Numerical simulations show the effectiveness of the proposed solution.

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