scholarly journals Bandwidth Enhancement of Antenna Arrays Utilizing Mutual Coupling between Antenna Elements

2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
Min Wang ◽  
Wen Wu ◽  
Zhongxiang Shen
Keyword(s):  
Reflection Coefficient ◽  
Antenna Arrays ◽  
Mutual Coupling ◽  
Coupling Effect ◽  
Approximate Expression ◽  
Scattering Parameters ◽  
Linear Superposition ◽  
Bandwidth Enhancement ◽  
Slot Arrays ◽  
Linear Antenna Arrays

The mutual coupling effect between antenna elements on an array's bandwidth is investigated using scattering parameters instead of the mutual impedance. First, an approximate expression is derived for matched voltage standing wave ratio (VSWR) bandwidth of a tuned antenna, which reveals that the bandwidth is inversely proportional to the magnitude|Γ0'(ω0)|of the frequency derivative of the reflection coefficient. Next, considering linear antenna arrays with corporate feed as an example, closed-form expressions of the reflection coefficient are derived at the input port of the feeding network, which shows that the active reflection coefficient of an array is the linear superposition of elements' passive reflection coefficientS11and the mutual coupling coefficientS12from adjacent elements. The VSWR bandwidth expressions for an array imply that bandwidth enhancement of the overall array can be achieved when the element passive reflection coefficientS11and mutual couplingS12are cancelled, as well as the frequency derivativesS11'andS12'also cancel each other. Slot arrays and a two-element Vivaldi array are investigated to verify the validity of our theoretical analysis. Numerical and experimental results are presented to successfully demonstrate the bandwidth enhancement of antenna arrays utilizing mutual coupling effect.

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays

2011 ◽  
Vol 57 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Mariusz Zamłyński ◽  
Piotr Słobodzian
Keyword(s):  
Antenna Arrays ◽  
Mutual Coupling ◽  
Planar Antenna ◽  
Sidelobe Level ◽  
Edge Diffraction ◽  
Narrow Angle ◽  
Compensation Technique ◽  
Diffraction Effects ◽  
Linear Antenna Arrays

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays In this paper the quality of a technique to compensate for mutual coupling (and other phenomena) in small linear antenna arrays is investigated. The technique consists in calculation of a coupling matrix, which is than used to determine corrected antenna array excitation coefficients. Although the technique is known for more than 20 years, there is still very little information about how different phenomena existing in a real antenna arrays influence its performance. In this paper two models of antenna arrays are used. In the first model the effect of mutual coupling is separated from the aperture edge diffraction. In the second model antenna both mutual coupling and aperture edge diffraction effects are included. It is shown that mutual coupling itself can be compensated very well and an ultralow sidelobe level (i.e. -50 dB) could be achieved in practice. In the presence of diffraction effects -46.3 dB sidelobe level has been attained, but radiation pattern can be controled only in narrow angle range (i.e. up to ±60°).

Complete and Unified Time- and Frequency-Domain Study on 4-D Antenna Arrays Including Mutual Coupling Effect

2020 ◽  
Vol 68 (2) ◽  
pp. 824-837 ◽  
Author(s):  
Feng Yang ◽  
Shiwen Yang ◽  
Weijun Long ◽  
Yikai Chen ◽  
Fang Wang ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Antenna Arrays ◽  
Mutual Coupling ◽  
Coupling Effect

Mutual coupling effects in linear antenna arrays

1970 ◽  
Vol 48 (6) ◽  
pp. 659-674 ◽  
Author(s):  
A. L. VanKoughnett
Keyword(s):  
Integral Equations ◽  
Antenna Arrays ◽  
Mutual Coupling ◽  
Linear Antenna ◽  
Coupling Effects ◽  
Mutual Impedance ◽  
Impedance Characteristics ◽  
Linear Antenna Arrays

The effects of mutual coupling among the array elements on the pattern and impedance characteristics of linear antenna arrays are examined. Based upon the assumption that the mutual impedance of two array elements depends only upon the separation of the elements, exact expressions are derived for the properties of infinite and semi-infinite arrays. Integral equations which describe finite arrays are derived and solved for special forms of the mutual impedance behavior and for large arrays.

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