Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TC4
Session:
Number:3TC4-3
Multi-band Dipole Antenna Incorporated with Single-band Square-patch AMC
M. Abu, M.K.A. Rahim, F. Ismail, S.H. S. Ariffin, S.K.S. Yusof, M. R. Kamarudin,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Recently, there has been increasing interest in investigating metamaterial structures that exhibit novel electromagnetic properties not found in nature. The metamaterial structures include the Artificial Magnetic Conductor (AMC) which is known as Perfect Magnetic Conductor (PMC). AMC has high impedance surface exhibits a reflectivity of +1 oppose to a perfect electric conductor (PEC) which has a reflectivity of -1 [1, 2]. The AMC condition is characterized by the frequency or frequencies where the phase of the reflection coefficient is zero degrees. The important characteristic of the AMC is this structure has a reflected wave in phase with the incident wave. Generally, a meandered or folded dipole film tag antenna has been popular for Radio Frequency Identification (RFID) tag antenna structure. When the antenna is attached to a metallic object, the dipole tag antenna cannot be powered up by the field strength emitted by the reader since the metallic object reflects RF wave. The impedance of the tag antenna, resonant frequency of the antenna and radiation efficiency will be changed due to the parasitic capacitance between the tag antenna and the metallic object [3, 4]. To minimize effects of the parasitic capacitor between the dipole antenna and metallic object and the effect of the reflection of the RF wave by metallic object, a gap between tag antenna and the metallic object is placed and dielectric material between them is added [5]. But in [6], they stated that the tag performance mainly due to various kinds of platform materials can be prevented and the antenna gain also can be increased when AMC is used as a ground plane to the low-profile antenna. The AMC structure was studied in [7] to make a lowprofile passive RFID tag whose performance is tolerant to metallic objects. In this paper, the design and performance of printed dipole antenna with high impedance surface (HIS) ground plane using Artificial Magnetic Conductor (AMC) is presented. The dipole antenna with straight and meandered structure is proposed to cover three RFID frequencies; 0.92GHz, 2.45GHz and 5.8GHz. Then, the dipole antenna is incorporated with single-band 5.8GHz AMC which is square-patch frequency selective surface backed by a ground plane. The performance of the antenna with and without the AMC layer is discussed including the input return loss, realized gain and radiation efficiency.