TAILIEUCHUNG - Báo cáo "Design dual band microstrip antenna for RFID application"

The research, simulation and design dual band antenna which operates at 900MHz and are conducted. FR4-epoxy substrate is chosen with thickness h = , εr = . Dual band can be achieved by using different methods of impedance’s matching for single antenna which is originally designed at 900MHz. Some dual band RFID structures are discussed in this paper. | VNU Journal of Science Natural Sciences and Technology 26 2010 276-280 Design dual band microstrip antenna for RFID application Tran Minh Tuan National Institute of Information and Communications Strategy 115 Tran Duy Hung Hanoi Vietnam Nhận ngày 19 tháng 3 năm 2010 Abstract. The research simulation and design dual band antenna which operates at 900MHz and are conducted. FR4-epoxy substrate is chosen with thickness h sr . Dual band can be achieved by using different methods of impedance s matching for single antenna which is originally designed at 900MHz. Some dual band RFID structures are discussed in this paper. Keywords dual band antenna RFID antenna impedance matching. 1. Introduction It is not new concept however recent years Radio Frequency Identification RFID is used widely. Nowadays RFID usually operates at 125 kHz - 135 kHz LF HF 420MHz - 460MHz 860MHz - 960MHz UHF ISM 1-4 . However depending on the using purposes some applications need small structure others require multipurpose tags or tags can be used in different environments. Therefore reduction size of antenna and combination multi antennas are requested 5 . In this aspect dual band antennas are one of the best solutions. The combination of frequencies usually is between 900MHz and or and 900MHz. In fact so far many structures have been studied. For example designing two antennas on the same substrate or using a rectangular patch or H-shape patch with coaxial feeder and shorting pin. Other structures like slot antennas with L -shape or U - shape structures can be used too. In this paper we propose new approach to achieve dual band from single antenna by matching impedance method. We chose dual antenna which operate at 900MHz and to design simulate and manufacture. 2. Design and simulation It should be noted that any antenna always has more than one resonant frequency. It depends on feeder or matching impedance. Normally it is not .

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