In this study two rectangular patch antennas with deltoid shaped slots are proposed. It is aimed to show the effects of the slots for different frequencies and different dielectrics. The antennas are designed for 37 GHz and 39 GHz which are among the projected 5G frequencies in millimeter wave bands. For the designs RT5880 and RO3003 dielectric substrates are selected for each antenna to obtain the effects of the materials. At different operating frequencies and different substrate materials, the deltoid shaped slots result in different amounts of improvements in return loss levels. The antenna with the slots designed with RT5880 has a return loss reduction of 18.81 dB for 37 GHz and 16.37 dB for 39 GHz which means a progress in S11 levels of 44.47% for 37 GHz and 36.14% for 39 GHz. The antenna with the slots designed with RO3003 has a return loss reduction of 25.17 dB for 37 GHz and 27.54 dB for 39 GHz which means a progress in S11 levels of 58.44% for 37 GHz and 78.80% for 39 GHz. The results can give a good insight for antenna designers how the antennas react to same modifications at different frequencies for different substrate materials in millimeter wave bands.
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