METHOD FOR CONSTRUCTING MULTIFUNCTIONAL L BAND ACTIVE PHASED ARRAY ANTENNAS FOR RADAR SYSTEMS

2018 ◽  
pp. 73-79
Author(s):  
A. V. Mazin ◽  
N. V. Samburov
Keyword(s):  
Antenna Arrays ◽  
Classification Systems ◽  
Electrical Strength ◽  
Practical Implementation ◽  
Phased Array Antennas ◽  
Phased Antenna Arrays ◽  
Radar Systems ◽  
Urgent Task ◽  
Decimeter Range ◽  
L Band

The article poses the urgent task of increasing the efficiency of functioning of active phased antenna arrays (APAA) radar stations. Particular attention is paid to the development of modern multifunctional phased L-band arrays. Contradictions in the main criteria for ship antennas are revealed, and ways to eliminate them are proposed. Based on the study of radar and classification systems for ship-based targets and on the analysis of the results, a new method for constructing L-band multifunctional APAA for these systems has been proposed. It is proposed to use a dipole-type emitter in antenna arrays, which operates in the decimeter range and the lower part of the centimeter range. It has high mechanical and electrical strength. The article presents a scheme for constructing an APAA classification system, simulation results and an example of the practical implementation of the proposed method.

scholarly journals Features of excitation reconstruction in flat multielement phased antenna array face using dynamic directional patterns

2017 ◽  
pp. 32-39
Author(s):  
S. E. Gavrilova ◽  
A. N. Gribanov ◽  
G. F. Moseychuk ◽  
A. I. Sinani
Keyword(s):  
Antenna Arrays ◽  
High Efficiency ◽  
Phase Distribution ◽  
Radiation Patterns ◽  
Phased Array Antennas ◽  
Phased Antenna Arrays ◽  
Phased Antenna Array ◽  
Transformation Algorithms ◽  
Computational Resources ◽  
Research Show

The study focuses on reconstructing the amplitude-phase distribution of flat multielement passive and active phased antenna arrays with the use of dynamic radiation patterns, measured with electronical scanning without mechanical rotations and antenna movements. The paper describes the measurement settings of dynamic radiation patterns, necessary for reconstructing the amplitude-phase distribution. Findings of the research show that to reconstruct the amplitude-phase distribution according to dynamic radiation diagrams, there is no need for increased computational resources due to the use of Fourier transformation algorithms. After the method was experimentally verified on the specific samples of active phased antenna arrays, its high efficiency was established. The paper gives the examples of reconstructing the amplitude-phase distribution from dynamic radiation patterns in the presence of malfunctions in active phased array antennas.

Modifications of active phased antenna arrays near-field diagnosis method based on compressive sensing

2019 ◽  
Vol 11 (7) ◽  
pp. 568-576 ◽  
Author(s):  
Grigory Kuznetsov ◽  
Vladimir Temchenko ◽  
Maxim Miloserdov ◽  
Dmitry Voskresenskiy
Keyword(s):  
Compressive Sensing ◽  
Antenna Arrays ◽  
Near Field ◽  
Practical Implementation ◽  
Phased Antenna Arrays ◽  
Two Factors ◽  
Minimization Procedure ◽  
Diagnosis Method ◽  
Proposed Modification

AbstractThis paper presents two modifications of compressive sensing (CS)-based approach applied to the near-field diagnosis of active phased arrays. CS-based antenna array diagnosis allows a significant reduction of measurement time, which is crucial for the characterization of electrically large active antenna arrays, e.g. used in synthetic aperture radar. However, practical implementation of this method is limited by two factors: first, it is sensitive to thermal instabilities of the array under test, and second, excitation reconstruction accuracy strongly depends on the accuracy of the elements of the measurement matrix. First proposed modification allows taking into account of thermal instability of the array by using an iterative ℓ1-minimization procedure. The second modification increases the accuracy of reconstruction using several simple additional measurements.

Synthesis of Conformal Phased Antenna Arrays With A Novel Multiobjective Invasive Weed Optimization Algorithm

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 209-219 ◽  
Author(s):  
Wen Tao Li ◽  
Yong Qiang Hei ◽  
Xiao Wei Shi
Keyword(s):  
Antenna Arrays ◽  
Dynamic Range ◽  
Practical Implementation ◽  
Invasive Weed Optimization ◽  
Invasive Weed ◽  
Ratio Requirement ◽  
Conformal Array ◽  
Phased Antenna Arrays ◽  
Element Pattern ◽  
Aerodynamic Performances

Abstract By virtue of the excellent aerodynamic performances, conformal phased arrays have been attracting considerable attention. However, for the synthesis of patterns with low/ultra-low sidelobes of the conventional conformal arrays, the obtained dynamic range ratios of amplitude excitations could be quite high, which results in stringent requirements on various error tolerances for practical implementation. Time-modulated array (TMA) has the advantages of low sidelobe and reduced dynamic range ratio requirement of amplitude excitations. This paper takes full advantages of conformal antenna arrays and time-modulated arrays. The active-element-pattern, including element mutual coupling and platform effects, is employed in the whole design process. To optimize the pulse durations and the switch-on instants of the time-modulated elements, multiobjective invasive weed optimization (MOIWO) algorithm based on the nondominated sorting of the solutions is proposed. A S-band 8-element cylindrical conformal array is designed and a S-band 16-element cylindrical-parabolic conformal array is constructed and tested at two different steering angles.

Mantle cloaking for decoupling of interleaved phased antenna arrays in 5G applications

2020 ◽  
Author(s):  
Shefali Pawar ◽  
Hossein Mehrpour Bernety ◽  
Harry G. Skinner ◽  
Seong-Youp Suh ◽  
Andrea Alù ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Phased Antenna Arrays

Hybrid Sparse Linear Array Synthesis Applied to Phased Antenna Arrays

2014 ◽  
Vol 13 ◽  
pp. 185-188 ◽  
Author(s):  
Leonardo F. Yepes ◽  
David H. Covarrubias ◽  
Miguel A. Alonso ◽  
Ramon Ferrus
Keyword(s):  
Antenna Arrays ◽  
Linear Array ◽  
Phased Antenna Arrays ◽  
Sparse Linear Array

scholarly journals Radar system with dedicated planar traveling wave antennas for elderly people monitoring

2020 ◽  
Vol 18 ◽  
pp. 97-110
Author(s):  
Sassan Schäfer ◽  
Simon Müller ◽  
Daniel Schmiech ◽  
Andreas R. Diewald
Keyword(s):  
Elderly People ◽  
Antenna Arrays ◽  
Traveling Wave ◽  
Radar System ◽  
Propagation Path ◽  
Design Parameters ◽  
Microstrip Technology ◽  
Actual Object ◽  
Radar Systems ◽  
24 Ghz

Abstract. Radar systems for contactless vital sign monitoring are well known and an actual object of research. These radar-based sensors could be used for monitoring of elderly people in their homes but also for detecting the activity of prisoners and to control electrical devices (light, audio, etc.) in smart living environments. Mostly these sensors are foreseen to be mounted on the ceiling in the middle of a room. In retirement homes the rooms are mostly rectangular and of standardized size. Furniture like beds and seating are found at the borders or the corners of the room. As the propagation path from the center of the room ceiling to the borders and corners of a room is 1.4 and 1.7 time longer the power reflected by people located there is 6 or even 10 dB lower than if located in the center of the room. Furthermore classical antennas in microstrip technology are strengthening radiation in broadside direction. Radar systems with only one single planar antenna must be mounted horizontally aligned when measuring in all directions. Thus an antenna pattern which is increasing radiation in the room corners and borders for compensation of free space loss is needed. In this contribution a specification of classical room sizes in retirement homes are given. A method for shaping the antenna gain in the E-plane by an one-dimensional series-fed traveling wave patch array and in the H-plane by an antenna feeding network for improvement of people detection in the room borders and corners is presented for a 24 GHz digital beamforming (DBF) radar system. The feeding network is a parallel-fed power divider for microstrip patch antennas at 24 GHz. Both approaches are explained in theory. The design parameters and the layout of the antennas are given. The simulation of the antenna arrays are executed with CST MWS. Simulations and measurements of the proposed antennas are compared to each other. Both antennas are used for the transmit and the receive channel either. The sensor topology of the radar system is explained. Furthermore the measurement results of the protoype are presented and discussed.

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