The gain enhancement of rectangular slot antenna with L - shaped and double I - shaped slot etching and metal box adding at 2.45GHz for wireless communications

摘要

This paper presents the directive gain enhancement of rectangular slot antenna with L-shaped and double I-shaped slot etching and metal box adding technique at 2.45 GHz for wireless communications. In many previous antenna researches, a large size of traditional antenna and low directive gain are the defect of antenna. That defect can be overcome by increase of bandwidth. In this paper, by etching L-shaped slot on the rectangular stub and adding double I-shaped slot on ground plane for perfect impedance matching: 50 ohm. Then, this antenna added rectangular metal box at front and back antenna as size a quarter of wavelength for increasing directive gain. The antenna structure was designed and fabricated on print circuit board (PCB) with FR4. The operational parameters and characteristics of the proposed antenna were determined by using the CST Microwave Studio and the experimental technique. The simulation and measurement results indicated that the reflection coefficient of proposed antenna was less than -10 dB. The measured bandwidth of proposed antenna is 18.16% (2.29 - 2.76 GHz) which was pressed with the average gain of 4.32 dBi. The proposed antenna is capable of WLAN (IEEE 802.11b/g) /WiMAX (IEEE 802.16e) applications.