Numerical Analysis of Correlation Coefficient for MIMO Antennas in a Mode-Stirred Chamber

2017 ◽  
Vol 54 (12) ◽  
pp. 19-23
Author(s):  
Jong-Sung Kim
Keyword(s):  
Numerical Analysis ◽  
Correlation Coefficient ◽  
Mimo Antennas

scholarly journals Correlation in MIMO Antennas

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 651
Author(s):  
Naoki Honma ◽  
Kentaro Murata
Keyword(s):  
Correlation Coefficient ◽  
Multiple Input Multiple Output ◽  
Antenna Element ◽  
Mimo Antennas ◽  
S Parameter ◽  
Pattern Correlation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Real Performance ◽  
The Difference

Multiple-input multiple-output (MIMO) antennas are commonly evaluated by using the correlation coefficient. However, the correlation has several different definitions and calculation methods, and this misleads the real performance of the MIMO antennas. This paper describes five definitions and their differences of the correlation, i.e., signal correlation, channel correlation, fading correlation, complex pattern correlation, and S-parameter-based correlation. The difference of these characteristics is theoretically and numerically discussed, and their relations are schematically presented. Furthermore, the relationship between the correlation coefficient and the antenna element spacing is numerically evaluated, and it is shown that correlation coefficient calculated only from the S-parameter yields the error greater than 10% when the efficiency of the antenna is lower than 97%.

scholarly journals Robustness of the sample correlation - the bivariate lognormal case

1999 ◽  
Vol 3 (1) ◽  
pp. 7-19 ◽  
Author(s):  
C. D. Lai ◽  
J. C. W. Rayner ◽  
T. P. Hutchinson
Keyword(s):  
Numerical Analysis ◽  
Correlation Coefficient ◽  
Simulation Analysis ◽  
Bivariate Normal Distribution ◽  
Bivariate Normal ◽  
Population Correlation ◽  
Sample Correlation ◽  
Skewness And Kurtosis ◽  
Bivariate Lognormal

The sample correlation coefficient R is almost universally used to estimate the population correlation coefficient ρ. If the pair (X,Y) has a bivariate normal distribution, this would not cause any trouble. However, if the marginals are nonnormal, particularly if they have high skewness and kurtosis, the estimated value from a sample may be quite different from the population correlation coefficient ρ.The bivariate lognormal is chosen as our case study for this robustness study. Two approaches are used: (i) by simulation and (ii) numerical computations.Our simulation analysis indicates that for the bivariate lognormal, the bias in estimating ρ can be very large if ρ≠0, and it can be substantially reduced only after a large number (three to four million) of observations. This phenomenon, though unexpected at first, was found to be consistent to our findings by our numerical analysis.

scholarly journals Compact MIMO Slots Antenna Design with Different Bands and High Isolation for 5G Smartphone Applications

2020 ◽  
Vol 16 (4(Suppl.)) ◽  
pp. 1093
Author(s):  
Ayman mohammed Ibrahim
Keyword(s):  
Correlation Coefficient ◽  
Return Loss ◽  
Antenna Design ◽  
Smartphone Applications ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
Chinese Markets ◽  
High Degree ◽  
Degree Of Isolation ◽  
Envelope Correlation

 In this paper, two elements of the multi-input multi-output (MIMO) antenna had been used to study the five (3.1-3.55GHz and 3.7-4.2GHz), (3.4-4.7 GHz), (3.4-3.8GHz) and (3.6-4.2GHz) 5G bands of smartphone applications that is to be introduced to the respective US, Korea, (Europe and China) and Japan markets. With a proposed dimension of 26 × 46 × 0.8 mm3, the medium-structured and small-sized MIMO antenna was not only found to have demonstrated a high degree of isolation and efficiency, it had also exhibited a lower level of envelope correlation coefficient and return loss, which are well-suited for the 5G bands application. From the fabrication of an inexpensive FR4 substrate with a 0.8 mm thickness level, a loss tangent of 0.035 and a dielectric constant of 4.3, the proposed MIMO antennas that had been simulated under the five different band coverage were discovered to have demonstrated a respective isolation level of about 14dB, 12dB, 21.5dB, 19dB and 20dB under a -10dB impendence bandwidth. In the measurement and fabrication outcomes that were derived from the use of the prototype MIMO in the (3.4-3.8) band of the Europe and Chinese markets, the proposed MIMO was thus found to have produced a better performance in terms of efficiency, isolation, and envelope correlation coefficient (ECC).

scholarly journals Novel Wideband MIMO Antennas That Can Cover the Whole LTE Spectrum in Handsets and Portable Computers

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mohamed Sanad ◽  
Noha Hassan
Keyword(s):  
Correlation Coefficient ◽  
Wideband Antennas ◽  
Mimo Antennas ◽  
Antenna Configuration ◽  
Portable Communication ◽  
Communication Equipment ◽  
Portable Computers

A dual resonant antenna configuration is developed for multistandard multifunction mobile handsets and portable computers. Only two wideband resonant antennas can cover most of the LTE spectrums in portable communication equipment. The bandwidth that can be covered by each antenna exceeds 70% without using any matching or tuning circuits, with efficiencies that reach 80%. Thus, a dual configuration of them is capable of covering up to 39 LTE (4G) bands besides the existing 2G and 3G bands.2×2MIMO configurations have been also developed for the two wideband antennas with a maximum isolation and a minimum correlation coefficient between the primary and the diversity antennas.

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