Dual- and Triple- Band U-slot Microstrip Patch Antenna for WLAN Applications

Abstract: In this paper, Microstrip patch antenna fed through an aperture coupled 50Ω microstrip line is designed for dual- band and triple- band applications by cutting U-slots in the patch. When a U-slot is cut in the patch, a notch is introduced within the matching band, results in dual- band antenna. If another U-slot is cut in the same patch, antenna becomes a triple- band antenna. For better coupling aperture in ground is of U-shape. The patch antenna has been designed and simulated in CST Microwave Studio. The dual- band antenna resonates at 3.6GHz and 5.2 GHz whereas triple- band antenna resonates at 3.6 GHz, 5.2 GHz and 5.8 GHz. For U-slot dual- band antenna, the directivity of 6.345 dBi and 5.725 dBi is obtained at lower resonant frequency 3.6 GHz and upper resonant frequency 5.2 GHz respectively. U- slot triple band antenna shows 6.103 dBi, 6.371 dBi and 5 dBi directivity at lower resonant frequency 3.6 GHz, middle resonant frequency 5.2 GHz and upper resonant frequency 5.8 GHz respectively. The proposed antenna is used for WLAN applications.

Keywords: Aperture coupling, CST microwave studio, Dual- band, Triple- band, Microstrip line, Patch antenna, U-slot.