Parallel-Fed Planar Dipole Antenna Arrays for Low-Observable by Hema Singh, Chandini R., Rakesh Mohan Jha
By Hema Singh, Chandini R., Rakesh Mohan Jha
This booklet specializes in decision of scattering of parallel-fed planar dipole arrays by way of mirrored image and transmission coefficients at diverse degrees of the array method. In aerospace cars, the phased arrays are usually in planar configuration. The radar move part (RCS) of the car is principally as a result of its constitution and the antennas fastened over it. There will be scenario while the signatures as a result of antennas dominate over the structural RCS of the platform. This necessitates the learn in the direction of the aid and regulate of antenna/ array RCS. The planar dipole array is taken into account as a stacked linear dipole array. a scientific, step by step process is used to figure out the RCS trend together with the finite dimensions of dipole antenna components. The mutual impedance among the dipole parts for planar configuration is decided. The scattering until eventually second-level of couplers in parallel feed community is considered. The part shifters are modelled as hold up line. the entire couplers within the feed community are assumed to be 4 port units. it really is proven that the array RCS may be lowered significantly for an extremely low observable platform by means of an optimization of array layout parameters even within the presence of mutual coupling. This publication offers a scientific step by step analytical formula for RCS of planar half-wavelength centre-fed dipole arrays via a variety of schematics and illustrations. The analytical description and research supplied during this booklet can be important for college kids, researchers, and layout engineers of phased arrays.
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Additional info for Parallel-Fed Planar Dipole Antenna Arrays for Low-Observable Platforms
Example text
4λ. The values of characteristic impedance and load 20 64 x 1 planar dipole array 64 linear dipole array 10 RCS (dB) 0 -10 -20 -30 -40 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Angle (Deg) Fig. 10 RCS pattern of 64 × 1 planar dipole array. 4λ; Zo = 75 Ω; ZL = 50 Ω Parallel-Fed Planar Dipole Antenna Arrays … 28 20 RCS (dB) 10 0 -10 -20 -30 -90 -75 -60 -45 -30 -15 0 15 Angle (Deg) 30 45 60 75 90 Fig. 11 RCS pattern of 8 × 8 planar dipole array. 77λ; Zo = 75 Ω; ZL = 50 Ω termination are taken to be 75 and 50 Ω respectively.
Antenna theory and design, 594 p. Singapore: IEEE Press, Wiley (Asia). ISBN:981-253-1947. ,(1995) Radar and Laser Cross Section Engineering, 476 p. Washington, DC: AIAA Education Series. ISBN:1-56347-105-1. , H. M. Jha. (2012) Radar cross section (RCS) of a series-fed dipole array including mutual coupling effect. CSIR-National Aerospace Laboratories, Bangalore, India, Project Document PD AL 1222, 36 p. , H. M. Jha. (2013). Back-scattering cross section of a parallel-fed dipole array including mutual coupling effect.
1007/978-981-287-814-4 43 Subject Index A Antenna impedance, 8 reactance, 2 resistance, 2 Aperture distribution, 6, 27 Array aperture, 1, 5, 39 C Characteristic impedance, 8, 27, 32, 35, 37 Coupler, 2, 7–12, 26–29, 32, 37 first level, 8, 10, 11, 14, 15, 17, 19, 35, 37 second level, 2, 8, 18–20, 23, 26, 27, 37 Coupler port, 9, 11, 32 difference, 8–12, 14, 15, 18, 23, 29 sum, 8, 10–12, 14–17, 19, 20, 23 Coupling coefficient, 8, 11 Current distribution, 4 D Delay line, 2, 8, 27 Dipole antenna, 2, 27 length, 5, 28 radius, 28 Dipole array, 1, 2, 7, 8, 17, 19, 26–29, 32, 35, 37 linear, 27, 28 planar, 2, 4, 5, 7, 17, 26–29, 32, 37, 39 rectangular, 2 square, 2, 28, 37 E Effective height, 2, 4 F Feed network, 2, 5, 7–9, 11, 17, 19, 27, 29, 37, 39 G Geometrical configuration, 2 collinear, 6 parallel-in-echelon, 6 side-by-side, 6, 28 I Impedance mismatch, 2, 5, 7, 9, 19, 39 Inter-element spacing, 2, 3, 6, 27–29, 35, 39 M Mutual coupling, 2, 5, 27, 35, 39 Mutual impedance, 2, 5, 6, 27 P Phase factor, 3 Phase shifter, 2, 7, 8, 27 R Radar cross section, 1, 2, 4, 5, 7–9, 17, 26–29, 32, 35, 37, 39 broadside, 27, 32 Radiation impedance, 2 Radiator, 7, 8 Reflected field, 4, 5, 7–9, 13–17, 19, 20, 26 Reflection coefficient, 2, 5, 7–11, 29 S Sidelobe, 28 Signal propagation, 7 Signal reflection, 7, 8 Specular lobe, 28, 29, 32, 35 T Terminal voltage, 5 Terminating impedance, 2, 7, 32 Transmission coefficient, 1, 2, 8, 10, 11, 19, 39 © The Author(s) 2016 H.