The proposed antenna array provides bore-sight gain of -15.1 dBi at 4.2 GHz and -7.5 dBi at 8.1 GHz of 54.2 MHz and 81.8 MHz, respectively. The performance of the array is characterized in terms of S-parameters, broadband gain and correlation spectra as well as the radiation patterns. The maximum linear dimension of the antenna array is λo/7.2 × λo/4.3 × λo/137. The microstrip antenna patch is consistent of rectangular part slotted with a diagonal trace and a meander trace which reduces the electrical size of the microstrip patch, when it is printed on substrate of εr = 3.5, to λo/18 × λo/5. This approach reduces the mutual coupling to -17 dB within a separation distance of 1.4 mm ≈ λo/51, where λo is the wavelength at 4.2 GHz. Moreover, the common area of the ground plane, between the two antennas, is augmented with Uniform Compact-Photonic Band Gap (UC-PBG) structures to prevent surface waves.
In this paper, the use of a diagonal slot on the microstrip patch to reflect the surface current in a direction opposite to that of the neighboring patch. The array is designed to resonate at 4.2 GHz and 8.1 GHz for biomedical micro-sensing technology and biomedical diagnostics applications, respectively. In this paper, a miniaturized microstrip antenna array with two patches is proposed for wearable MIMO systems.
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