Abstract
This paper presents a novel compact 2 × 2 planar MIMO antenna system with ultra-wide band capability. Antenna system is specifically designed to target lower 5th generation operating bands ranging from 2 GHz to 12 GHz. This band also covers the IEEE 802.11 a/b/g/n/ac. The antenna array geometry has been simulated using CST MWS. The design is extremely miniaturized with total structure size of 13×25×0.254 mm3. The simulated and measured results have been presented. Measured and simulated return loss values for designed antenna are less than −10 dB over the operating band and lowest values of −35 dB and −32.5 dB can been seen at 5.2 GHz and 9.2 GHz, respectively, whereas at the center frequency the return loss is −25.2 dB. The mutual coupling between both elements is less than −20 dB over the transmission bandwidth. Simulated and measured radiation patterns in E and H planes at center frequency show nearly isotropic far fields. The maximum gain is measured as 4.8 dB. Promising results of Envelope Correlation Coefficient and gain diversity of the design have been achieved. Simulated and measured results are found in good agreement. The fractional bandwidth of antenna is measured as 143.2% which satisfies its ultra-wide band response.
Highlights
In the coming years, the global mobile data traffic is likely to be projected by 45%; this means a ten times increase between the years 2016 and 2022 [1]
The global mobile data traffic is likely to be projected by 45%; this means a ten times increase between the years 2016 and 2022 [1]. This massive increase is mainly due to mobile video streaming and implementation of Internet of Things (IoT)
While designing Multiple Input Multiple Output (MIMO) antenna systems, the main effort achieved lower value of transmission coefficient between the ports and this is regarded as a key factor in design
Summary
The global mobile data traffic is likely to be projected by 45%; this means a ten times increase between the years 2016 and 2022 [1]. In order to meet this challenge and according to the current demands, a novel ultra-wide band (UWB) 2 × 2 Multiple Input Multiple Output (MIMO) antenna system has been designed and simulated. This antenna system covers the frequency band ranging from 2 GHz to 12 GHz, which covers all the lower 5G frequency bands. The main challenge in designing these kinds of antenna systems are to reduce the mutual coupling between the radiating elements within smaller volumes of small handheld devices This can be achieved by polarization diversity or by increasing the space between the antennas [8]. Space diversity is achieved by using two asymmetric “F” type structures with a very compact fractured ground plane [11]
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