A dual-port transparent multiple-input multiple-output (MIMO) antenna resonating at sub-6 GHz 5G band is proposed by using patch/ground material as transparent conductive oxide (AgHT-8) and a transparent Plexiglas substrate. Two identical circular-shaped radiating elements fed by using a microstrip feedline are designed using the finite element method (FEM) based high-frequency structure simulator (HFSS) software. The effect of the isolation mechanism is discussed using two cases. In case 1, the two horizontally positioned elements are oriented in a similar direction with a separate ground plane, whereas in case 2, the elements are vertically placed facing opposite to each other with an allied ground. In both cases, the transparent antennas span over a −10 dB band of 4.65 to 4.97 GHz (300 MHz) with isolation greater than 15 dB among two elements. The diversity parameters are also analyzed for both the cases covering the correlation coefficient (ECC), mean effective gain (MEG), diversity gain (DG), and channel capacity loss (CCL). The average gain and efficiency above 1 dBi and 45%, respectively with satisfactory MIMO diversity performance, makes the transparent MIMO antenna an appropriate choice for smart IoT devices working in the sub-6 GHz 5G band by mitigating the co-site location and visual clutter issues.
In this study, an antenna with a frequency of 2.4 GHz has been designed that can be used in new generation wireless communication systems, which are in high demand with the development of technology. The designed antenna has Wi-Fi operating frequency range according to IEEE 802.11 standards. While choosing the antenna design, micro-strip antenna was preferred due to their geometry, lightness, low cost of production and compactness. While designing the antenna, the CST microwave studio program was deemed appropriate to be used and the necessary measurements were made. It has been deemed appropriate to use copper in the ground and patch parts of the antenna design. ROGERS 5880 (RT5880), for micro-strip circuit applications, was preferred as the substrate material. The dielectric coefficient of the selected material is 2.2. Its thickness is taken as 0.81 mm. As a result of the design, most of the intended goals were achieved. The gain of the designed antenna is measured as 2.73 dBi return loss value 30 dB and the bandwidth as in the 2.33-2.48 GHz range. These results are acceptable according to the standards. The 2.4 GHz antenna designed in this study can be used for Wi-Fi studies according to the experimental results.
In rapidly developing technology, most of engineering applications need to be done remotely. An antenna is needed to transmit the values received as a result of these remote studies. The antenna type that is more suitable to use in line with this need is the Wi-Fi antenna. Although this antenna is low in cost, it provides benefits to the user by using a good band. In this study, a Wi-Fi antenna design at 2.4 GHz frequency for use in the E-Health kit-based biotelemetry module is discussed. In this designed antenna, FR-4 substrate with dielectric coefficient of 4.3 is used. In the ground and patch parts, copper was used as the material. The return loss is 13.54 dB at 2.4GHz operating frequency with the gain value of 2.75 dBi. It was aimed to use this antenna as a Wi-Fi antenna in the E-Health kit-based biotelemetry module.
In today’s world many technological devices can operate with very low power levels. Despite this situation, these devices need to be fed with a sustainable energy source and constantly charged. This low level power need can be attained from ambient electromagnetic waves from any radio frequency sources. Radio frequency energy harvesting systems can be offered to feed these type of devices and these systems have been used in many areas in recent years. In this study, an antenna designment that can be used in RF energy harvesting systems is emphasized. Within the scope of this study, an RF energy harvesting antenna operating at 2.4 GHz frequency has been modeled. The electromagnetic performance and antenna fundamental parameters of the RF energy harvesting antenna are numerically calculated using a commercial 3D based on a transmission line matrix (TLM) and the finite integration technique (FIT). The physical extents of the antenna are 35 x 28 x 1.6 mm. The proposed RF energy harvesting antenna has 2.1 dBi directivty and %98.1 radiation efficiency performance parameters. The antenna proposed here can be have usage areas such as an RF energy harvesting antenna for low-power medical devices, self sustainable wireless devices in Internet of Things (IoT), Wireless Body Sensor Network (WBSN) devices.
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