Design of Dual Offset Shaped Reflector Antenna Based on Degl Algorithm

Abstract

This paper presents a synthesis technique of the dual offset shaped reflector antenna using Differential Evolution with Global and Local neighborhoods (DEGL) algorithm. The main reflector and subreflector are parameterized by Zernike polynomial expansion. With these expansion coefficients, the antenna is optimized to achieve a contoured beam covering the China territory in Ku-band. The performance of the antenna is calculated by Physical Optics (PO) and Physical Theory of Diffraction (PTD) techniques. The calculated results are validated by the commercial software GRASP9.3.01.

Design of shaped offset cable mesh reflector antennas considering structural flexible property

“…Using the optimisation toolbox of linear programming, the optimisation model in (9) in ith iteration can be solved. The cable dimensions are updated in the next iteration by adding the ith solution to their original values…”

“…With the spread utilisation of cable mesh reflector antennas, the requirement of contoured beams for cable mesh reflectors is demanded in the next antenna design period from preliminary concept to practical engineering [8]. The way that consists of a single feed and a shaped reflector is very popular with its advantages of simplicity and low cost [7,9]. Therefore, a shaped cable mesh reflector illuminated by a single feed to cover the shape of required coverage region on the earth is attractive and preferred to produce the contoured beams.…”

Sensitivity analysis of faceted reflector antennas and a contour beam synthesis technology

“…In the satellite communications, the contoured beam reflector antennas usually play an important role [21]. Owing to the complexity of beam forming network and the increasing cost of feed array, a single-fed reflector antenna is a common selection for producing a contour beam because of its simplicity.…”

“…A shaped faceted reflector antenna which covers the shape of the required coverage region on the earth with the desired directivity is required for the next concept design. There are some methods for synthesising contour beams such as in [21][22][23][24][25]. In [22], the reflector is divided into an array of square elements in the aperture plane and by optimising the element phase distribution, the element coordinates are renewed and the pattern is obtained using geometric optics with the steepest descent method.…”

Improvement of Iterative Physical Optics Using Previous Information to Guide Initial Guess

“…Numerical techniques developed to analyze an open-ended cavity include low-frequency methods, such as the method of moments (MoM) [1,2], finite element method (FEM) [3,4], and finite different time domain (FDTD) [5][6][7], and high-frequency methods, such as geometrical optics (GO) [8,9], geometrical theory of diffraction (GTD) [10], physical optics (PO) [11,12], and the physical theory of diffraction (PTD) [13,14]. Low-frequency methods solve Maxwell's equations with no implicit approximations and are typically limited to objects of small electrical size due to limitations of computation time and system memory.…”