A compact four-element UWB MIMO antenna is proposed and its characteristics are investigated. The proposed antenna has a hexagon molecule-shaped fractal structure as its radiating element. The antenna elements are placed orthogonally to each other in order to yield good isolation, without any additional decoupling structure. The band rejection in WLAN band is attained by etching a C-shaped slot on each radiating element. The antenna has a compact size of 40 × 40 × 1.6 mm 3 and exhibits stable omni-directional radiation pattern. In addition, it shows an acceptable impedance bandwidth (S 11 < −10 dB) in the range 2.4-10.6 GHz with an isolation better than −20 dB over the UWB range. The performance of the proposed antenna is calculated in terms of antenna characteristics and MIMO parameters. The isolation level in-between the elements is found to be reasonable for MIMO application. The simulated and measured results are in good accord which makes the antenna a suitable candidate for massive MIMO and high-density packaging applications.
Table 3 presents the comparison of the proposed parasitic patch array antenna in different literatures. 4,10,11 The parameters including number of layer and patch, the size of the antenna, the impedance bandwidth and the peak gain are taken into account. From the table, we can see that the 5 3 5 CPPS-based array antenna has the advantages of simple structure, wide bandwidth and high gain.
| C ONCL US I ONThis article presents a design of a 5 3 5 array antenna based on coplanar parasitic patch structure. A feed network is formed via dual ports stimulating the two center patches and resonance branches between the central patches and the parasitic patches. The designed array antenna has a simple structure, high gain, strong orientation, and low crosspolarization. It has good reference value to the array antenna research. Therefore, it has important applications in communication and radar system.
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