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The objective of this paper is to reconstruct the free space radiation pattern from non-anechoic measurements in three-dimension (3D) using the impulse response both in the time and angular domains of the non-anechoic environment. This methodology could reconstruct two-dimension (2D) radiation pattern of antenna under test (AUT) characterized in non-anechoic environment and we extend it to reconstruct...
The objective is to demonstrate a new approach for approximating the free space radiation pattern of an antenna, through the non-anechoic environment data. The key point of this method is to describe the non-anechoic environment using the impulse response of it both in time and angular domain. And the free space radiation pattern can then be extracted through further processing of the measured data...
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...
This paper presents a new design of the Yagi antenna with a super-directivity of 8.9dBi. The Yagi antenna has two folded elements; one is a fed element and the other is a parasitic element. Except the high directivity, this antenna also shows quite good input impedance and return loss performance at the working frequency of 300MHz. The 10dB fractional bandwidth is only about 1.3%, which restricts...
The hybrid method of MOM and PO 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.
This paper presents a new electromagnetic simulator called HOBBIES (Higher Order Basis Based Integral Equation Solver). HOBBIES is based on a parallel In-Core and Out-of-Core integral-equation solver and has a personal pre- and postprocessor called GiD. GiD is used to create the geometrical and topological information of the model, define the run environment required by the solver and display results...
The narrow-wall slotted waveguide array is widely used in many radar applications and is complicated to analyze. Previous works have been reported on how to analyze the structure. However, it is the first time that the optimization results of this waveguide array antenna are presented in this paper. Two optimization examples are given and results show that the radiation patterns are improved after...
This paper presents a new electromagnetic simulator called HOBBIES (Higher Order Basis Based Integral Equation Solver). HOBBIES is based on a parallel In-Core and Out-of-Core integral-equation solver and a personal pre- and post-processor called GiD®. HOBBIES presents some important features such as multiplatform and multilanguage environment, definition of models using symbolic variables, automatic...
The NEWUOA is a newly developed trust region based derivative-free method for solving unconstrained optimization problems. We present in this paper this powerful tool for antenna optimization. Two antenna design examples are optimized using simplex method, conjugate gradient method and the NEWUOA algorithm. Optimization results are presented and compared. The NEWUOA shows good performance and is proved...
We have laid down the optimization guidelines for the scanning of the beam-pattern in the azimuth direction. The procedure of selecting the initial values by using the principle of reciprocity followed by the local optimization is more suited to this application as it gives an accurate value with less iteration. We also show that phase-only technique which is relatively easier to implement is applicable...
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