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A semi-circular patch antenna (SCPA) is designed for WiMAX and WiFi-5/6 communications. The footprint of the proposed SCPA is only 30 Â 40 Â 1.575 mm 3 , which is composed of a semi-circular patch and a partial ground plane. The main strength of this work is that the estimated wide dual-frequency span of 2.39-3.75 GHz and 5.39-7.18 GHz are contributed with two sharp resonances at 2.77 and 6.46 GHz, respectively. The proposed SCPA has been practically tested after fabrication. The measured results confirm that the designed antenna achieved the bandwidth necessity for WiMAX 1.5(2.5-2.69 GHz), WiMAX 2 (3.4-3.6 GHz), and . In the two resonance frequencies of 2.77 and 6.46 GHz, the designed antenna achieved a gain of 2.558 and 4.109 dB, respectively. In addition, the SCPA also manifests good radiation properties and achieves an average efficiency of more than 90%. A professional version of the 3D electromagnetic simulator is utilized to examine the effect of diffident parameters and model the tested antenna.semi-circular patch antenna, partial ground plane, WiMAX, WiFi-5/6, CST | INTRODUCTIONWireless technologies are becoming progressive due to the dramatic increase in the demand for cellular internet connectivity to billions of wireless device users worldwide. 1 Different modern broadband wireless technologies like Bluetooth (2.4-2.485 GHz), LAN (5.47-5.725 GHz), WiMAX (3.4-3.6 GHz), mobile communication, radar, satellite communication and so forth use different frequency bands of the spectrum to meet the increasing demand of highspeed data transmission. [2][3][4] According to IEEE standard 802.11ac and 802.11ax, frequency band ranging from 5.925 to7.125 GHz is allocated to WiFi-5, and WiFi-6 is allowed to work at 5.925-7.125 GHz band. Recently, WiFi-6 (802.11ax) has been introduced, providing a peak data transfer speed of up to 9.6 Gb/s. 5 All wireless systems need a low-cost, simple and compact antenna to communicate effectively. 6 Due to low profile, lightweight and compactness features with higher efficiency, microstrip patch antennas have become very popular in current wireless devices. 7 A good number of antennas have already been reported to operate at the 5.925-7.125 GHz band. For example, for WiFi applications, Jianzhong and the rest 8 propose a dual-band miniature slot antenna. In the bottom layer of the designed antenna, there is a slotted radiator fed by an L-shaped microstrip line and resonating at 2.45 and 5.8 GHz. With an overall size of 20 Â 21 Â 1 mm 3 , the antenna achieved dual working bands of 2.42-2.49 GHz and

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An omni-directional inset fed wideband microstrip patch antenna (MPA) for Sub-6 GHz applications has been presented. Initially, a slotted small patch antenna with a full ground plane is designed and then partial ground plane and electromagnetically coupled parasitic elements have been incorporated and optimized to get desired performance. The volume of the studied antenna is 40 × 40 × 1.575 mm3 having a partial ground plane. Rogers RT 5880 is used as the dielectric substrate tier. The simulated operating band of the MPA ranges from 2.67 GHz to 4.20 GHz, covering the N77 and N78 bands with a centre operating frequency of 3.29 GHz. The antenna can also be used for WiMAX rel 2 (3.4–3.6 GHz) applications. After fabrication and testing, the antenna also shows almost the same working band extending from 2.67 GHz to 4.15 GHz. The use of a partial ground plane plays a vital role in making it an omni-directional antenna, and the existence of a rectangular parasitic element in the ground plane influences the improvement of gain and directivity of the antenna. The designed MPA allows it to run as a wide band antenna with a good reflection coefficient profile, high average efficiency, and 1 < VSWR < 2. At a resonant tip of 3.29 GHz, the simulated gain and directivity are 3.16 dB and 3.38 dBi, respectively. The measured gain is slightly higher than the simulated gain. The computer simulation technology (CST) is used for modelling and exploring all the performance matrices of the antenna. The results of the fabricated prototype present very good similarity with the simulated results and both simulated and measured results also support the Sub-6 GHz band. The antenna prototype shows a very well balanced set of radiation characteristics with a miniaturized volume and high efficiency. Therefore, the inset fed MPA can be contemplated as a candid model for Sub-6 GHz band applications.

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