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In this paper, we investigated the performance of multiple elements array system such as receive power, signal correlation, channel capacity, and etc., in the presence of mutual coupling based on microwave network theory analysis. Combining S-parameter method and network analysis, the performance of MIMO receiver was studied detailedly. Computer simulations were operated for three different matching conditions: characteristic impedance match, self-impedance match and optimal multiport conjugate (MC) match. The results show that the impact of different matching condition on system’s performance is quite distinct, that is, the matching network plays an important role on improving the performance of MIMO system. Introduction In wireless communication, multiple input multiple output (MIMO) system equipped with multiple antennas at both transmitter and receiver sides can increase the channel capacity greatly[1][2]. Due to this attractive performance improvement, MIMO technique has been considered by many academic researchers, which leads to a great deal of publications. However, mutual coupling among antennas occurs when multiple antenna elements are placed in a small assembling place, such as in a mobile phone, a compact MIMO base station platform, etc [3]. Such coupling will lead to increasement of correlation of antenna signals [4]-[5]. Correlation of the receiver signals can considerably decrease the capacity of multiple element array (MEA) systems [6]. [7]-[11] have investigated the impact of different matching networks on the correlation of signals and MIMO capacity. In this paper, an alternative analysis method based on microwave network theory is presented to describe the compact MIMO communication systems. Using the so-called S-parameter representation, we will analyze the performance of the MIMO systems when there is serious mutual coupling among different antennas elements. Antenna Network Model Fig.1 shows complete network structure model of compact MIMO communication system. Here, we regard 0 b as the excitation source of receiver antenna array. From Fig.1 and microwave network theory [12], we can lead to 0 RR R R b b S a = + (1) 11 R R a S b = (2) In order to make the power transmitted to the load maximally, a matching network with scattering matrix M S is placed in the position between the antenna network and load. It is assumed 4th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2016) © 2016. The authors Published by Atlantis Press 1260 that the matching network is lossless, that is, there is I S S M H M = , where I is the identity matrix, and ( )  denotes the conjugate transpose operator. M S can be expressed as[3]

Impact of mutual coupling on performance of MIMO systems based on network theory analysis