a reconfigurable antenna design for 5G applications is presented. It is based on monopole antenna and fractal structure. The design structure is consisted of (monopole) feedline, ground plane, L-shape reflector, fractal structure and PIN diodes. The antenna is printed on (25×29×1.6 mm3) FR-4 substrate of εr=4.3 and tanδ =0.001. The antenna shows a resonant frequency at 4.1 GHz with S11=-11.4 dB and Omni-direction pattern of 1.21 dB gain. The L-shaped reflector is used to maintain the radiation pattern in a specific direction. Moreover, the proposed fractal structure is found to operate as a circuit to give another resonant frequency and enhance the antenna performance. Where it is used to give more manipulation in the antenna performance including: frequency resonance and radiation patterns. The PIN-diodes are used to give many cases for more current manipulation. moreover, the authors used RF (50 SMA port) between monopole antenna and right side of ground plane to optimize directing radiation pattern and to eliminate the problems of interference between AC and DC current that produced from using PIN diode. This manipulation leads to change the resonant frequency and radiation pattern to the desired direction.So all parts are printed on a single side of FR4 substrate
In this paper, a design of a reconfigurable printed antenna circuitry for 5G portable devices is proposed based on a miniaturized structure. Thus, the proposed antenna is structured as a printed circuit monopole with a coplanar waveguide port (CWP). The ground proposed CWP is designed as an L-shaped reflector in order to increase the directivity of the proposed antenna toward a certain direction. A matching circuitry based on a fractal Minkowski structure of the first order is inductively attached to the antenna design to increase the antenna bandwidth. To control the antenna performance, the matching circuit is connected to the L-shaped reflector through four PIN diodes. The effects of different switching scenarios on the antenna performance are tested numerically and experimentally for validation. It is found that when all diodes are switched ON, such antenna shows two frequency bands, S 11 < À10 dB, from 3.5 to 3.7 GHz and from 5.08 to 6.9 GHz. Nevertheless, the antenna gain is found to be about 3.47 dBi at 3.6 GHz and 3.69 dBi around 5.1 GHz. The other switching scenarios are tested and presented in this work. It is observed that the PIN diodes' switching affects significantly on the antenna directivity and the radiation patterns. The antenna performance is parametrically analyzed using CST MWS based on a numerical technique and based on an analytical circuit model. The proposed antenna is fabricated and tested to be compared against the theoretical results. An excellent agreement was obtained between the simulated and measured results.
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