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.

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 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 Coherently Radiating Periodic Structures to Reduce the Number of Phase Shifters in a 2-D Phased Array

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6592
Author(s):  
Elizvan Juárez ◽  
Marco A. Panduro ◽  
David H. Covarrubias ◽  
Alberto Reyna
Keyword(s):  
Phase Shifter ◽  
Phased Array ◽  
Phased Arrays ◽  
Periodic Structures ◽  
Amplitude Distribution ◽  
Phase Shifters ◽  
Full Wave ◽  
Planar Array ◽  
Scanning Range ◽  
Array Geometry

This paper illustrates the application of CORPS (coherently radiating periodic structures) for feeding 2-D phased arrays with a reduced number of phase shifter (PS) devices. Three design configurations using CORPS are proposed for 2-D phased arrays. The design model of phased array for these configurations considers the cophasal excitation required for this structure to set a strategic way for feeding the antenna elements and reducing the number of PS devices. Blocks of 2 × 3 and 4 × 7 CORPS networks depending on the configuration in the 2-D phased array are set strategically in the feeding network to generate the cophasal excitation required in the antenna elements. These design configurations used for feeding the antenna elements in the planar array geometry provide several advantages with respect to others in the scanning capability and the reduction of the number of PS devices of the array system. The full-wave simulation results for the proposed configurations in 2-D phased arrays provide a reduction in the number of PSs of until 69% for a scanning range of ±25° in elevation and ±40° in azimuth. The application of the raised cosine amplitude distribution could generate radiation patterns with a SLL_PEAK ≈ −19 dB and SLL_PEAK ≈ −23 dB for the design proposed configurations in all the scanning range.

scholarly journals A Simple Printed Cross-Dipole Antenna with Modified Feeding Structure and Dual-Layer Printed Reflector for Direction Finding Systems

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5966
Author(s):  
Kyei Anim ◽  
Bonghyuk Park ◽  
Hui Dong Lee ◽  
Seunghyun Jang ◽  
Sunwoo Kong ◽  
...  
Keyword(s):  
Impedance Matching ◽  
Axial Ratio ◽  
Direction Finding ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
Matching Conditions ◽  
Feeding Technique ◽  
Feeding Structure ◽  
Feed Network ◽  
Signal Path

In this paper, a simple printed cross-dipole (PCD) antenna to achieve a right-hand circular polarization (RHCP) at the L/S-band for direction finding (DF) systems is presented. The radiating part of the antenna consists of two printed dipoles that interlock with each other and are mounted orthogonally on a dual-layer printed reflector. To connect the feedlines of the dipole elements to the antenna’s feed network, which is located on the backside of the reflector, a through-hole signal via (THSV) is employed as the signal interconnection instead of the mainstream approach of using coaxial bead conductor. This feeding technique provides a degree of freedom to control the impedance of the signal path between the feedlines and the feed network in the numerical simulation for improved matching conditions. The proposed THSV extending through the dual-layer printed reflector is more reliable, durable, and mechanically robust to stabilize the matching conditions of the fabricated antenna in contrast to the coaxial-based approach that is more susceptible to impedance mismatch due to solder fatigue. Thus, the proposed PCD antenna offers advantages of broadband, flexible impedance matching, and fabrication ease. The antenna exhibits an impedance bandwidth (IBW) of 59% (1.59–2.93 GHz), a 3-dB axial ratio bandwidth (ARBW) of 57% (1.5–2.7 GHz), and a peak of 7.5 dB within the operating frequency band.

Algorithm for Fewest Arms of Multi-Band Linear Dipole Antenna

2022 ◽  
pp. 1-1
Author(s):  
Bing Xiao ◽  
Hang Wong ◽  
Yichen Wei ◽  
Lawrence K. Yeung
Keyword(s):  
Dipole Antenna ◽  
Linear Dipole ◽  
Multi Band
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