scholarly journals Sensitivity Reduction over a Frequency Band for MIMO Systems

1990 ◽  
Vol 26 (9) ◽  
pp. 1003-1008
Author(s):  
Yoshito OHTA ◽  
Shinzo KODAMA
Keyword(s):  
Frequency Band ◽  
Mimo Systems

scholarly journals Wideband Multiport Antennas

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6960
Author(s):  
Mehdi Seyyedesfahlan ◽  
Abdulkadir Uzun ◽  
Anja K. K. Skrivervik ◽  
Ibrahim Tekin
Keyword(s):  
Correlation Coefficient ◽  
Frequency Band ◽  
Mimo Systems ◽  
Ground Plane ◽  
Wireless Systems ◽  
Full Duplex ◽  
Reflection Coefficients ◽  
Next Generation ◽  
Better Than ◽  
Multiport Antennas

In this paper, a wideband four port 2–6 GHz antenna is proposed. One-, two-, and four-port antennas are implemented and characterized between 2 and 6 GHz. The isolation between the ports is improved by connecting and optimizing the ground plane sections. The results show that the antennas’ reflection coefficients are better than 10 dB in the frequency band. The measured isolation between the ports is greater than 15 dB (between 2.3 and 6 GHz) and 10 dB in the whole band for two- and four-port antennas, respectively, however, it is more than 20 dB around 2.4 and 5–6 GHz for both antennas. The calculated correlation coefficient between ports is below −30 dB (>2.14 GHz) and −15 dB for the two- and four-port antennas, respectively. The measured gain and efficiency scale are 3.1–6.75 dBi and 62–98%, respectively. To the best of our knowledge, an antenna both being wideband from 2 to 6 GHz and having independent four ports is only addressed in this work. The four-port antenna can be used for MIMO systems or smartphones operating on many wireless systems simultaneously such as 3G/4G/5G Sub-6 GHz and WLAN including the next generation WiFi7 with full-duplex operation.

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