Circular Layout Hybrid Patch CSRR Loaded Antenna for Sub-6GHz n77, n78, n79 Band Applications with Applications-Interference Eliminations

An antenna for the elimination of in-band application interferences in the sub-6 GHz mid-frequency region is presented. The hybrid patch loaded with a complementary split ring resonator (CSRR) eliminates the in-band interference issue by introducing a notch band from 4.22 GHz to 4.39 GHz, which bisects the wideband into two distinct bands and separates n77/78 bands to interfere with the n79 band. A hybrid patch is obtained on a circular substrate using edge feeding. The hybrid patch comprises a combination of an equilateral triangle and a regular pentagon. The reduced ground length makes the antenna frequency response wideband. This stage has a wideband frequency spectrum and suffers from in-band application interferences between n77 (3.8-4.2 GHz), n78 (3.3-3.8 GHz), and n79 (4.4-5.0 GHz). The CSRR loading eliminates the existing inband application interference. The antenna achieves a gain of 4.72 dBi and 4.54 dBi at 3.39 GHz and 4.46 GHz in the two bands (2.94-4.22 GHz) and (4.39-5.80 GHz), respectively. The HFSS-designed antenna is again designed in the CST software, then fabricated and measured using SVA1075X, and their reflection coefficients and radiation patterns are compared, and these are found in good agreement. The result validates the antenna functionality. This antenna is suitable for Wi-Fi 5 (802.11ac) and Wi-Fi 6 (802.11ax), n77, n78, n79, S-band and C-band satellite, and radar applications. The circular layout antenna is novel in the sense that it occupies less space and becomes compact without its miniaturization exercise concerning traditional antennas designed on the same frequencies.