full ground plane but rather a partial one. The final obtained antenna presents an ultra-wide band characteristic that covers the entire low THz frequency range from 252 to 325 GHz. It is worth mentioning here that the presented work is based on previous design in [10], where the author designs a patch antenna for operation in 5G networks at a resonant frequency of 39 GHz using whale optimization algorithm (WOA). This work uses a different optimization algorithm (SSA) to design a patch antenna at a higher frequency of 300 GHz and also includes the concept of partial ground plane to increase antenna bandwidth. 10.2 Related Work Patch antennas are an appealing antenna design option for millimeter-wave fre- quency bands and above. This is due to their benefits, which include ease of fabrication, low profile, and, more importantly, low cost. In the literature, several researchers have designed and manufactured antennas that work well in millimeter- wave frequency bands [3, 18]. The authors in [3] present a dual-band circularly polarized slotted patch antenna for operation at 28 and 38 GHz. The polarization bandwidths (i.e., axial ratio value below 3 dB) reported by the authors are about 200 and 400 MHz on 28 and 38 GHz band, respectively. Moreover, the authors in [18] present a 1 X 2 compact wide band rectangular patch antenna for operation at IEEE 802.16a (5-6 GHz) and 802.16b (2-11 GHz). The antenna design uses the concept of partial ground to achieve wide band behavior. In the literature, the E-shaped patch antenna is a popular shape among the antenna designers [11, 15, 25]. The authors in [15] propose an E-shaped coaxial-fed patch antenna for operation in two frequency bands (1.8 and 2.4 GHz). The design method is a parallel PSO/FDTD algorithm, and the antenna is fabricated on a substrate with dielectric constant 2.2. Additionally, the E-shaped antenna is used by the authors in [25] to present a metallic antenna on air substrate for operation at the 5.2 and 5.8 GHz. The authors use a combined design method based 