Abstract
A design method of compact dual-polarized antennas has been proposed for multiple input and multiple output (MIMO) handset application. For the sake of high isolation in dual polarizations, a printed monopole and a hybrid slot antenna are combined using a coplanar waveguide (CPW) and microstrip hybrid feeding structure. The proposed topology will result in orthogonal current distribution modes for the different polarizations, which effectively reduces the mutual coupling of the two modes. The operation mechanism of the feeding structure is analyzed in principle and verified by simulation. Simulated and measured results show this compact dual-polarized antenna achieves isolation between the two ports of better than 25 dB, and the relative bandwidth is wider than 23.5%.
Highlights
Researches on multiple input and multiple output (MIMO) technology are very popular in wireless communication area, since more than 1 Gbps data transmission rate can be achieved using MIMO technology
As revealed in many literatures [1, 2], the performance of MIMO system sensitively depends on the status of the channel, including radio propagation, multipath effect, and antenna radiation pattern
As shown in previous literature [4, 5], the capacity of MIMO system can be enhanced by using switchable polarization schemes in the redundant elements of MIMO system
Summary
Researches on multiple input and multiple output (MIMO) technology are very popular in wireless communication area, since more than 1 Gbps data transmission rate can be achieved using MIMO technology. Several antenna selection schemes [4,5,6,7,8] have been studied extensively so far, such as space selection, radiation pattern selection and polarization selection. In this paper, based on our proposed dual-polarized antenna in [9], a detailed design method of compact dualpolarized MIMO antennas is presented and discussed. This antenna combines a printed monopole [10, 11] fed by coplanar waveguide and a hybrid slot antenna [12,13,14,15] fed by coupling microstrip line to generate vertical and horizontal polarized radiation, respectively. Measured S-parameters and radiation patterns are presented to validate the proposed design
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