Reflector antenna pattern improvement using optimized array feed

1995 ◽  
Vol 73 (7-8) ◽  
pp. 407-411 ◽  
Author(s):  
Birsen Saka ◽  
Erdem Yazgan
Keyword(s):  
Radiation Pattern ◽  
Reflector Antenna ◽  
Physical Optics ◽  
Excitation Condition ◽  
Reflector Antennas ◽  
Minimization Method ◽  
Rotationally Symmetric ◽  
Planar Array ◽  
Excitation Conditions ◽  
Least Squares Minimization

A method to optimize the radiation pattern of rotationally symmetric reflector antennas with an array feed is introduced. The optimization of the radiation pattern for the purpose of beam scanning is achieved by adjusting the excitation condition of each element of the planar array. The radiation-pattern calculation is based on the physical optics radiation integral. The excitation conditions (amplitude and phase) of the array elements are calculated using the least-squares minimization method.

scholarly journals Shaping Single Offset Reflector Antennas Using Local Axis-Displaced Confocal Quadrics

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Rafael A. Penchel ◽  
José R. Bergmann ◽  
Fernando J. S. Moreira
Keyword(s):  
Differential Equation ◽  
Nonlinear Partial Differential Equation ◽  
Numerical Procedure ◽  
Reflector Antenna ◽  
Physical Optics ◽  
Exact Formulation ◽  
Reflector Antennas ◽  
Conservation Of Energy ◽  
Reflector Surface ◽  
Monge Ampere

This work investigates a novel numerical procedure for the solution of an exact formulation for the Geometrical Optics synthesis of a single reflector antenna by simultaneously imposing Snell’s Law and Conservation of Energy in a tube of rays, yielding a second-order nonlinear partial differential equation of Monge-Ampère type, which can be solved as a boundary value problem. The investigation explores the interpolating properties of confocal quadrics to locally represent the shaped reflector surface. It allows the partial derivatives involved in the formulation to be analytically expressed. To illustrate the method, two examples of offset single reflectors shaped to radiate a Gaussian power density within a superelliptical contoured beam are presented. The results are validated by Physical Optics analysis with equivalent edge currents.

Reflector antenna analysis using physical optics on Graphics Processing Units

2014 ◽  
Author(s):  
Oscar Borries ◽  
Hans Henrik Brandenborg Sorensen ◽  
Bernd Dammann ◽  
Erik Jorgensen ◽  
Peter Meincke ◽  
...  
Keyword(s):  
Graphics Processing Units ◽  
Reflector Antenna ◽  
Physical Optics ◽  
Graphics Processing

A physical optics based near-field analysis method for the design of dual polarized fan beam shaped reflector antennas

2016 ◽  
Vol 70 (2) ◽  
pp. 132-137 ◽  
Author(s):  
E. Bagheri-Korani ◽  
K. Mohammadpour-Aghdam ◽  
M. Ahmadi-Boroujeni ◽  
E. Arbabi ◽  
M. Nemati
Keyword(s):  
Near Field ◽  
Field Analysis ◽  
Physical Optics ◽  
Analysis Method ◽  
Reflector Antennas ◽  
Dual Polarized

Vibration characteristics simulation and comparison of traditional cab system model and seat–cab coupled model for trucks

2019 ◽  
Vol 10 (03) ◽  
pp. 1950013 ◽  
Author(s):  
Leilei Zhao ◽  
Yuewei Yu ◽  
Changcheng Zhou ◽  
Simon Feng
Keyword(s):  
Angular Acceleration ◽  
Coupled Model ◽  
Random Excitation ◽  
Vibration Characteristics ◽  
Dynamic Responses ◽  
System Model ◽  
Vertical Acceleration ◽  
Excitation Condition ◽  
Vertical Excitation ◽  
Excitation Conditions

To define the application fields of the traditional cab system model and the seat–cab coupled model, this paper mainly aims to investigate the differences of the vibration characteristics of the two models. First, the two models and their motion equations were introduced. Then, based on the mechanical parameters of the seat and cab system for a truck, the transmissibility characteristics of the two models were analyzed. The results show that the traditional model can relatively accurately predict the pitch and roll vibration characteristics of the real seat–cab system. However, it overvalues the vertical vibration transmitted from the front suspensions of the cab. Third, the typical excitation conditions and the measuring points were selected. Finally, under the typical excitation conditions, the dynamic responses of the measuring points were calculated. The results show that under the vertical excitation condition, the dynamic responses of the two models have obvious differences. Under the roll excitation condition and the pitch excitation condition, the roll responses and the pitch responses of the cab between the two models show almost no obvious difference. Under the random excitation condition, the vertical acceleration responses have relatively larger deviations between the two models, however, the angular acceleration responses are almost the same. For the preliminary design of the cab system, the traditional cab system model can be used. However, for the accurate design and the optimization of the seat–cab system, the seat–cab coupled model is recommended.

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