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Handbook of Smart Antennas for RFID Systems by Nemai Chandra Karmakar

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CHAPTER 11

DESIGN OF PORTABLE SMART ANTENNA SYSTEM FOR RFID READER: A NEW APPROACH

JEFFREY S. FU

Department of Electronic Engineering, Chang Gung University, Taoyuan, Taiwan, Republic of China

WEIXIAN LIU

School of Electrical and Electronic Engineering, Nanyang Technological University Singapore

NEMAI CHANDRA KARMAKAR

Department of Electrical and Computer Systems Engineering, Monash University Clayton, Victoria Australia

11.1 INTRODUCTION

Wireless communication has become an important part of our daily lives. Wireless local area network (WLAN) has become popular due to its emerging trend as a communication tool for networking in offices and homes. The heavy usage of wireless communication causes rapid electromagnetic (EM) radiation pollution in our environment. With the heavy use of the system, users’ expectations on the performance of the wireless tools have increased. A poor design or noisy surroundings might cause the wireless devices to encounter interferences resulting in a poor communication system. Smart antenna systems, if integrated into such devices, will improve its signal-to-interference ratio (SIR) by using beamforming [1, 2] of signals in the desired direction while nulling the interference signals. These unique capabilities of smart antennas improve the SIR and the capacity of the system. However, implementation of the smart antenna system requires very expensive analog-to-digital converters (A/Ds), digital signal processing (DSP) chips and system, antenna modules, ...

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