Alternative Method for Obtaining Antenna Current Green's Function Based on Infinitesimal Dipole Modeling

The antenna current Green's function (ACGF) can be used to consider the mutual coupling effect between multiple arrayed antennas. To obtain the ACGF of antennas, numerical simulations such as moment method (MoM) are mainly used. However, these numerical simulations require large memory and it i...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2019-04, Vol.67 (4), p.2583-2590
Main Authors: Yang, Sung-Jun, Kim, Young-Dam, Jo, Hye-Won, Myung, Noh-Hoon
Format: Article
Language:English
Subjects:
Active element pattern (AEP)
Antenna arrays
antenna current Green’s function (ACGF)
Antenna radiation patterns
CAD
Computer aided design
Computer memory
Computer simulation
Current distribution
Dipole antennas
Dipoles
infinitesimal dipole modeling (IDM)
Mathematical model
Mathematical models
Method of moments
Mutual coupling
Numerical models
Patch antennas
Solid modeling
Yagi antennas
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Description
Summary:The antenna current Green's function (ACGF) can be used to consider the mutual coupling effect between multiple arrayed antennas. To obtain the ACGF of antennas, numerical simulations such as moment method (MoM) are mainly used. However, these numerical simulations require large memory and it is time consuming to obtain a solution. The computer-aided design (CAD) model for the numerical simulation should be accurately designed. Therefore, we propose an alternative method for obtaining the ACGF based on infinitesimal dipole modeling (IDM). The IDM is a technique to model antennas with a distribution of theoretically expressed dipoles. The infinitesimal dipoles have the form of a current distribution, the same as that of the ACGF. The IDM can be optimized with the radiation pattern of the modeled antenna, which can be measured without a numerical simulation. The CAD model is not required, and only an approximate dimension of the antenna is used. A CAD model of a seven-patch array antenna with a large platform and a manufactured single Yagi antenna are used to verify the proposed scheme. For verification, we calculate the active element pattern (AEP) based on the ACGF for the antennas. These AEPs calculated, based on the ACGF obtained by MoM, are compared with those calculated on the basis of the IDM. The AEPs represent a sufficient coincident tendency and the phase values are even more accurate than the existing scheme.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2894279