In this article, the design and experimental characterization of a transparent MIMO fractal antenna compatible with 5G communications are presented. An Indium Tin Oxide (ITO) film with a thickness of 150 nm deposited over a glass substrate was used to fabricate the proposed antenna. This antenna is conformed by a pair of CPW-fed octagonal patch. Both patches were modified using a fractal structure, based on a Minkowsky geometry. The antenna was designed to operate in the frequency range from 3 to 5 GHz, which covers the C-band 5G-NR standard frequency assigment. As a result of the experimental characterization, S 1 1 and S 2 2 parameters are below − 10 dB, meanwhile the transmission coefficients S 2 1 and S 1 2 are under − 20 dB in the desired band. The Envelope Correlation Coefficient (ECC) is between 0.02 and 0.45, and a Diversity Gain (DG) over 9.05 in the frequency range from 3 to 6 GHz. These experimental results agree with the MIMO system in the required band.

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In this paper we describe the analysis and design of a reconfigurable planar antenna that can operate in the ISM band of 2400 MHz and in the mobile GSM telephony band of 1850 MHz, that is also in accordance to required parameters to be used for Cognitive Radio applications. The antenna was designed as a plane square spiral using microstrip technology and the reconfigurability was made with an inductor.