Multi-objective optimization design of S-shaped inlet with internal bump

Antenna pattern measurements are usually carried out in an anechoic chamber. However, a good anechoic chamber is very expensive to construct. Previous research has attempted to compensate for the effects of extraneous fields measured in a non-anechoic environment to obtain a free space pattern that would be measured in an anechoic chamber. Existing compensation techniques are like the Test Zone Field compensation method, the Fast-Fourier-Transform-based method, the Matrix Pencil method, and the Antenna Pattern Comparison technique. This work illustrates and extends a deconvolution methodology which allows the antenna measurement under a non-anechoic test environment and retrieves the free space radiation pattern of an antenna through this measured data; this allows for easier and more affordable antenna measurements. In this work, we modeled the extraneous fields as the system impulse response of the test environment and utilized a reference antenna to extract the impulse response. Then, we used it to remove the extraneous fields for a desired antenna measured under the same environment and retrieved the ideal pattern. The advantage of this process is that it does not require calculating the time delay to gate out the reflections; therefore, it is independent of the bandwidth of the antenna, and there is no requirement for prior knowledge of the test environment. This work contributes to the field not by proposing a new methodology for pattern reconstruction but by showing that the deconvolution methodology can analytically remove the effects of extraneous fields in antenna pattern measurements and by extending this method to antenna pattern measurements under three-dimensional environments. Also, a discussion of the parameters that affect the deconvolution methodology is given in this work. Extensive simulation examples with different environmental settings and with different antennas are presented in this work to demonstrate the applicability of the deconvolution method. Retrieval of Free Space Radiation Patterns through Measured Data in a Non-Anechoic Environment

/pdf/retrieval-of-free-space-radiation-patterns-through-measured-24pa7z98ek.pdf

Retrieval of free space radiation patterns through measured data in a non-anechoic environment

For the design and optimization of radome-enclosed antenna arrays, a fast numerical optimization algorithm is proposed to compensate the distortion error of radome-enclosed antenna arrays by correcting amplitude and phase of the excitations. Higher-order method of moments (MoM) is used to extract the eigen solution for each antenna element. In combination with the particle swarm optimization (PSO) algorithm, the antenna radiation characteristics can be quickly obtained by updating feeds, which avoid the repeated solution of the MoM matrix equation in the optimization process. Meanwhile, in the process of the eigen solution extraction, the use of the parallel technique significantly accelerates the solving of matrix equation. Finally, a radome-enclosed antenna array with 247,438 unknowns was optimized as an example, and the numerical results demonstrate effectiveness of the method.

PSO Algorithm Combined with Parallel Higher-Order MoM to Compensate the Influence of Radome on Antennas

A design of a blade antenna embedded in low-cost dielectric substrate (FR4) and operating at 4.97 GHz is the subject of this paper. The antenna design is accomplished using parametric analysis in the HFSS TM software, where the antenna dimensions are changed and it is observed how the changes affect figures-of-merit like input impedance, reflection coefficient and radiation patterns. The antenna prototype is presented, as well as, a comparison between experimental and theoretical results.

/pdf/design-of-a-blade-antenna-embedded-in-low-cost-dielectric-1urmr5rnev.pdf

Design of a Blade Antenna Embedded in Low-Cost Dielectric Substrate

Currently, more and more practical engineering applica- tions place antenna system on the electrically large platform. This paper deals with the problem of antennas mounted on large platform from two aspects | radiation pattern and system electromagnetic com- patibility (EMC). To achieve an accurate and efiective computation, this paper applies method of moment (MoM) with Higher-order basis functions solver with large-scale parallel computation technique. And flnally some real-life examples are presented to describe how to install antennas on the platform reasonably.

EMC Analysis of Antenna System on the Electrically Large Platform Using Parallel MoM with Higher-Order Basis Functions

The hybrid method of MOM (method of moments) and PO (physical optics) approach is used to calculate the radiation pattern of wire antenna around the structure in PO region. The hybrid MOM-PO approach is implemented by modifying the voltage matrix of the MOM region with PO. Results obtained from this method and from the commercial software FEKO agree well while the former is more efficient in computer RAM requirement.

Analysis of antenna around target with dielectric coatings with hybrid MOM-PO technique

A parallel version of Method of Moments (MoM) with Higher-Order Basis functions (HOB-MoM) with the Out-of-Core technique (OOC) is proposed to compute the Radar Cross Section (RCS) of an aircraft with engine inlets in this paper. The block-partitioned parallel scheme for the large dense MoM matrix is designed to achieve excellent load balancing and high parallel efficiency. The OOC technology is employed to break through the random access memory (RAM) limitation. Some numerical results demonstrate that the higher-order basis used in this paper is superior to the conventional RWG basis and is suitable to solve various electrically large problems such as the computation of RCS.

http://ap-s.ei.tuat.ac.jp/isapx/2013/pdf/158_2_0.pdf

Accurate evaluation of RCS on the structure of aircraft inlets

In this paper, a parallel hybrid MoM-PO algorithm is presented to analyze the performance of wire antennas around the dielectric or coated electrically large object. The proposed method requires less memory than the hybrid MoM-PO method in the commercial software FEKO needs, and some numerical examples are presented to validate and to show the effectiveness of this paper's method on solving the practical engineering problem. (6 pages)

Analysis of Wire Antenna around Dielectric or Coated Object Using Parallel MoM-PO Technique

This paper presents the Adaptive Cross Approximation (ACA) method combined with Time-Domain MoM (TD-MoM) to analyze the transient electromagnetic problem. On one hand, Marching-on-in-degree (MOD) method is used in TD-MoM to solve the TD-integral equations so that the disadvantage of late-time instability in Marching-on-in-time (MOT) method is avoided. On the other hand, the ACA algorithm is purely algebraic so that it can be easily applied to TD-MoM to accelerate the calculation and to reduce the CPU memory required for storing the data. Through a numerical example, this paper's method is proven feasible and efficient.

Time-domain method of moments accelerated by Adaptive Cross Approximation algorithm

In this paper, a Method of Moments with Higher-Order basis functions (HOBMoM), parallel implementation based on Message Passing Interface (MPI) and Out-of-Core technology (OOC) has been proposed to compute the Radar Cross Section (RCS) of an aircraft's engine. The block-partitioned parallel scheme for the large dense MoM matrix is designed to achieve excellent load balancing and high parallel efficiency. Because of the bottleneck of the RAM limitation, the out-of-core technology is employed. Some numerical results demonstrate that the Higher-Order basis used in this paper is superior to the conventional RWG basis and is capable of solving various electrically large problems such as the computation of RCS. (3 pages)

RCS computation of engine by parallel higher-order MoM with out-of- core technique

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