Ren Wenping

A Triple-Band Microstrip Antenna for WLAN Applications

A novel compact triple-band monopole microstrip antenna for WLAN applications is proposed. The proposed antenna is made up of two one-quarter wavelength resonating components, fed by a 50ohmic microstrip line. The configuration is simple. The resonating frequencies of the proposed antenna are 2.5GHz and 4.8GHz, respectively, the bandwidth is about 500MHz (2.25~2.75GHz) and 2.63GHz (3.82~6.45GHz) (return loss less than -10dB), covering the triple bands of WLAN system. The lower and higher resonant frequencies can be easily tuned by adjusting a few parameters of the presented antenna. This antenna satisfies the requirements of wireless local area network(WLAN) 802.11(2.4~2.484GHz, 5.15~5.35GHz, 5.725~5.825GHz) applications. The softwares of Ansoft HFSS11 and CST Microwave Studio are used to simulate and optimize the antenna.

An improved method about AES and FPGA high-speed realize

It is difficult to design to generate a S box with excellent crytographic properties in AES algorithms. So Wu Wenling et al. proposed a new S box. The paper is based on the new S box to realize extension from one set to multiple sets of S boxes by utilizing S box to generate time-shift selection function. And employ the dynamic S box of encryption and decryption scheme to AES advanced encryption algorithm. Then, design the S box on the FPGA platform. The simulation confirms that the method improves the speed of the encryption algorithm and reduces hardware logic unites of the encryption algorithm.