scholarly journals Spatial Correlation for DoA Characterization Using Von Mises, Cosine, and Gaussian Distributions

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Wamberto J. L. Queiroz ◽  
Francisco Madeiro ◽  
Waslon Terllizzie A. Lopes ◽  
Marcelo S. Alencar
Keyword(s):  
Spatial Correlation ◽  
Antenna Arrays ◽  
Electromagnetic Waves ◽  
Mutual Coupling ◽  
Coupling Effect ◽  
Exact Expression ◽  
Von Mises Distribution ◽  
Angle Of Arrival ◽  
Gaussian Distributions ◽  
Von Mises

This paper presents mathematical expressions for the spatial correlation between elements of linear and circular antenna arrays, considering cosine, Gaussian, and Von Mises distributions, for the direction of arrival (DoA) of the electromagnetic waves at the receiver antenna. The expressions obtained for the Von Mises distribution can include or not the mutual coupling effect between the elements and are simpler than those obtained for the cosine and the Gaussian distributions of the angle of arrival. The Von Mises distribution produces spatial correlation expressions in terms of Bessel and trigonometric functions. An exact expression for the spatial correlation, taking into account the mutual coupling, for the circular and linear arrays and an arbitrary number of elements are presented. It can be verified, by numerical evaluation of the expressions, that the coupling between the elements correlates the electromagnetic field, and a separation of half wavelength could not be enough to decorrelate them.

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

scholarly journals The Effect of Mutual Coupling on a High Altitude Platform Diversity System Using Compact Antenna Arrays

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Tommy Hult ◽  
Abbas Mohammed
Keyword(s):  
Mutual Information ◽  
High Altitude ◽  
Spatial Correlation ◽  
Antenna Arrays ◽  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Mimo Antennas ◽  
Optimal Separation ◽  
Communication Links ◽  
Input Multiple Output

We analyze the destructive effects of mutual coupling and spatial correlation between the separate antenna elements on a combined diversity system consisting of multiple HAPs (High-Altitude Platforms) employing various compact MIMO (Multiple-Input Multiple-Output) antenna array configurations, in order to enhance the mutual information in HAP communication links. In addition, we assess the influence of the separation angle between HAPs on system performance, and determine the optimal separation angles that maximize the total mutual information of the system for various compact MIMO antennas. Simulation results show that although the mutual information is degraded by mutual coupling and spatial correlation, the proposed HAP diversity system still provides better performance compared to a nondiversity system for all tested scenarios.

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.

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