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Gain Improvement of Dual-Band Circular Monopole Antenna for 2.45/5.5 GHz WLAN Applications DOI:10.15199/48.2019.05.37

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With Rapid developments of modern wireless communications, various microwave technologies have been utilized for different applications, which make the microwave spectrum more crowded. Wireless fidelity has transformed in to the standard for wireless local area network (WLAN) communications in the 2.45 and 5.5 GHz ISM bands, with the frequency ranges from 2.4 to 2.485 GHz as well as 5.150-5.350 GHz, 5.470-5.725 GHz, and 5.725-5.850 GHz [1]. For system flexibility and feasibility, antennas that are capable to serve in both of the specified operation bands are highly attracted. For this reason, dualantennas are promoted to overwhelm the 2.45- and 5.5 GHz WLAN bands [2]-[10]. A dual-band antenna can be usually accomplished by utilizing two types of singlefrequency antennas for each band [8], and taking a dualfrequency antenna for two separate bands [5], [9]. For the two types of single-frequency antennas, two external feeding networks must be come up with these individual dual-band antennas, which probably entail some structural sophisticates into applications [8]-[9]. As mentioned above, an element to make up a dualband antenna is more suitable to employ a dual-frequency antenna. There are many techniques to design for WLAN dual-band, such as using quarter-wavelength resonant slots in different shapes, coplanar fed, parasitic elements, and defected ground plane [5]-[13]. Latterly, many researchers adopt an attention on printed slot antennas (PSA), since wide-slot antennas have two orthogonal resonance modes, which are combined to form a wide impedance bandwidth [14]. As reported for increasing impedance bandwidth, antennas with various shapes like circle, ellipse, and triangle were introduced [15]. In our previous work [12], we presented the design and implementation of dual band with partial ground plane (PGP); nonetheless, its gain is not high. Hence, a technique to enhance the radiation performance of a microstrip-fed ci[...]

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