Title :
Compact linear antenna arrays for MIMO applications
Author_Institution :
Dept. of Elec. Eng., Chinese Univ. of Hong Kong, Shatin, China
Abstract :
A size reduction technique for linear antenna arrays is introduced. This approach utilizes different orthogonal eigenmodes existing in antenna arrays with highly-coupled elements as individual radiation mechanisms to avoid various undesired effects caused by mutual coupling and spatial correlations. Consequently, very compact linear arrays can be realized by simply having closer inter-element spacing (<; 0.2λ). In this paper, a general theory for this eigenmode technique is presented. Moreover, a prototype three-element linear array operating at 2 GHz is fabricated and tested to validate the concept. For this particular prototype, three identical monopoles separated by 0.2λ are mounted on a PCB of size 1λ × 1λ. They are then connected to a passive multi-port network, which serves as an eigenmode “decoupler”. Measured results indicate that an isolation of more than 16 dB is achieved between any two mode accessing ports of the network/array module, providing three independent radiation channels for typical MIMO applications.
Keywords :
MIMO communication; antenna radiation patterns; linear antenna arrays; multiport networks; passive networks; MIMO; PCB; antenna radiation pattern; compact linear antenna arrays; frequency 2 GHz; linear antenna arrays; mutual coupling; orthogonal eigenmodes; passive multiport network; spatial correlations; Couplers; Linear antenna arrays; MIMO; Mutual coupling; Wireless communication; Antenna array feeds; MIMO systems; antenna arrays; mutual coupling;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2010 Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-1-4244-7590-2
Electronic_ISBN :
978-1-902339-22-2