Design of a Dual-Band High-Gain Antenna Array for WLAN and WiMAX Base Station

A dual-band 3 x 2 antenna array with high gain is presented in this letter. A dual-band folded dipole antenna is utilized as the antenna array element. A broadband symmetric feed network is designed to maintain each array element with the identical current magnitude and phase. The antenna array has a low profile of 12 mm (about 0.1 lambda(L); lambda(L); is the wavelength in free space at the lowest operating frequency). Dual bands 2.3 similar to 2.56 and 3 similar to 4.2 GHz for return loss (RL) being higher than 10 dB can be obtained in simulation, while two 10-dB RL bands 2.31 similar to 2.51 and 3.1 similar to 4.15 GHz in measurement cover the wireless local area network (WLAN, 2.4 similar to 2.48 GHz) and Worldwide Interoperability for Microwave Access (WiMAX, 3.3 similar to 3.8 GHz). The measured results also show that this planar antenna array has a high gain 143. similar to 15.1 dBi (2.31 similar to 2.51 GHz) 16.2 similar to 17.3 dBi (3.1 similar to 4.15 GHz) in +z-direction and a low cross-polarization level < -26 dB.