scholarly journals Scattering Analysis of a Compact Dipole Array with Series and Parallel Feed Network including Mutual Coupling Effect

2013 ◽  
Vol 2013 ◽  
pp. 1-12
Author(s):  
H. L. Sneha ◽  
Hema Singh ◽  
R. M. Jha
Keyword(s):  
Cross Section ◽  
Mutual Coupling ◽  
Phased Array ◽  
Coupling Effect ◽  
Radar Cross Section ◽  
Scattering Cross ◽  
Stealth Technology ◽  
Feed Network ◽  
Feed Networks ◽  
Linear Dipole

The current focus in defense arena is towards the stealth technology with an emphasis to control the radar cross-section (RCS). The scattering from the antennas mounted over the platform is of prime importance especially for a low-observable aerospace vehicle. This paper presents the analysis of the scattering cross section of a uniformly spaced linear dipole array. Two types of feed networks, that is, series and parallel feed networks, are considered. The total RCS of phased array with either kind of feed network is obtained by following the signal as it enters through the aperture and travels through the feed network. The RCS estimation of array is done including the mutual coupling effect between the dipole elements in three configurations, that is, side-by-side, collinear, and parallel-in-echelon. The results presented can be useful while designing a phased array with optimum performance towards low observability.

scholarly journals Mutual Coupling Effects for Radar Cross Section (RCS) of a Series-Fed Dipole Antenna Array

2012 ◽  
Vol 2012 ◽  
pp. 1-20 ◽  
Author(s):  
H. L. Sneha ◽  
Hema Singh ◽  
R. M. Jha
Keyword(s):  
Mutual Coupling ◽  
Phased Array ◽  
Amplitude Distribution ◽  
Dipole Antenna ◽  
Antenna Aperture ◽  
Feed Network ◽  
Operational Frequency ◽  
Signal Path ◽  
Linear Dipole ◽  
Array Geometry

The estimation of RCS of a phased array depends on various parameters, namely, array geometry, operational frequency, feed network, mutual coupling between the antenna elements and so fourth. This paper presents the estimation of RCS of linear dipole array with series-feed network by tracing the signal path from the antenna aperture into the feed network. The effect of mutual coupling exhibited by the dipole antenna is considered for three configurations namely, side by side, collinear, and parallel in echelon. It is shown that the mutual coupling affects the antenna pattern (and hence RCS) significantly for larger scan angles. Further it is inferred that the RCS of phased array can be optimized by (i) reducing the length of the dipole, (ii) termination of the isolation port of the coupler with a suitable load, and (iii) using suitable amplitude distribution.

Differential cross-section measurements in positron–argon collisions

1996 ◽  
Vol 74 (7-8) ◽  
pp. 505-508 ◽  
Author(s):  
R. M. Finch ◽  
Á. Kövér ◽  
M. Charlton ◽  
G. Laricchia
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Coupling Effect ◽  
Channel Coupling ◽  
Scattering Cross

Differential cross sections for elastic scattering and ionization in positron–argon collisions as a function of energy (40–150 eV) are reported at 60°. Of particular interest is the energy range 55–60 eV, where earlier measurements by the Detroit group found a drop in the elastic-scattering cross section of a factor of 2. This structure has been tentatively attributed to a cross channel-coupling effect with an open inelastic-scattering channel, most likely ionization. Our results indicate that ionization remains an important channel over the same energy range and only begins to decrease at an energy above 60 eV.

scholarly journals Application of Novel Printed Dipole Antenna to Design Broadband Planar Phased Array

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Jie Xu ◽  
Wenbin Dou
Keyword(s):  
Mutual Coupling ◽  
Phased Array ◽  
Coupling Effect ◽  
Dipole Antenna ◽  
Coaxial Cable ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Dipole Antennas ◽  
Outer Conductor ◽  
Ground Plate

A broadband planar phased array consisting of 22 linear printed dipole antennas (PDA) is presented in this paper. The element is designed by a coax probe feeding mechanism with a ground plate configuration. The PDA with two arms placed on both sides of a substrate is realized. The inner conductor of the coaxial cable is connected to the PDA’s upper arm, and the outer conductor is connected to the PDA’s lower arm, so it eliminates the balun. The impedance bandwidth of the PDA array can be improved by increasing mutual coupling effect between the adjacent array elements. A dielectric layer, which is integrated on the surface of the antenna, is designed and fabricated to improve the impedance bandwidth and to shield the array. The measured results indicate the active VSWR is less than 3 over the frequency range of 4–20 GHz.

scholarly journals Radar Cross Section Reduction Techniques using Metamaterials

2019 ◽  
Vol 8 (9S) ◽  
pp. 103-111
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Unit Cell ◽  
Military Technology ◽  
Antenna Performance ◽  
Reduction Techniques ◽  
Stealth Technology ◽  
Research Activities ◽  
Electromagnetic Responses ◽  
Increasing Demand

In this paper, we have discussed and summarized the techniques of radar cross section reduction (RCSR). RCSR has been prompted due to the evolution of military technology. The paper reviews the basic concepts and characteristics of metamaterials, as these are the most favorable development that impacts defense industry products and stealth technology. This paper emphasizes the role of airpower and the ever-increasing demand for stealth. Initially, the blending of the fundamental aspects of stealth technology through radar signatures and methods of signature reduction are discussed. Then, the description of metamaterials and detailed analysis of their properties is made. This paper review the fundamental properties of metamaterials. It also explores the recent research activities on metamaterials in various areas. Some existing researches techniques used for RCSR are examined. The metamaterials are engineered media whose electromagnetic responses are different from those of their constituent components. The general benefits of metamaterials are pointed out in the paper. Metamaterials are mostly used in antenna configuration for enhancing antenna performance such as realizing miniaturization, expanding the operating band, enhancing gain as well as reducing RCS. These characteristics of the metamaterials are basically the reason why metamaterials should be used in stealth technology. The various categories of metamaterials used for RCSR are studied in the paper. In this paper, we have also proposed a unit cell. The unit cell consists of a square loop and intersecting strips at the edges of add shaped structure.

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