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This paper presents the establishment of a simple criterion for nanoantenna design. The motivation for this research is to propose a design guideline for planar nanoantennas that can be applied to retention devices. Due to the efficiency limits of solar cells, other solar energy conversion technologies are becoming increasingly attractive. One of these promising devices is the Antenna Rectifier or Rectenna. It consists of a nanoantenna that must operate in the infrared spectrum of solar radiation, with built-in rectifier and filter. In this work, five types of nanoantennas are simulated: dipole, bow tie, spiral, log-periodic and meander. In an attempt to circumvent the lack of criteria for flat nanoantennas for retinal system application, the criterion established here is to keep the overall dimensions equal for all types of nanoantennas, as stated by Wheeler. The gain established by Harrington is compared to the simulated ones. The results determine that it is a reasonable criterion to first obtain the best candidates for nanoantenna. The simulation method used was the FIT - Finite Integral Technique - as a numerical method to obtain the electromagnetic behavior of antenna. The simulation results demonstrate that the criterion of placing inscribed nanoantennas in a predefined circle applies. This work is just a simulation to compare different nanoantennas. Experimental results are underway based on fabricated nanoantennas.