|78||Design of a Dual-Frequency Micro-strip Patch Antenna for RFID Applications|
A dual-frequency micro-strip patch antenna printed on a single substrate is proposed. This antenna is composed of a C-slot and a modified rectangular-slot, which produce two different frequency bands. The lower band at 2.45GHz and the upper band at 5.8GHz are determined by the C-slot and the modified rectangular slot respectively. The key parameters of the design are considered to show how to obtain dual-frequency. This type of antenna is suitable for RFID applications especially for electronic toll systems.
|106||Design and Optimization of a Miniaturized Broadband Tag Antenna for UHF RFID Antennas|
In order to achieve the characteristics of miniature, low cost and broad bandwidth for RFID tag antennas, a novel passive UHF tag antenna is proposed in this paper. The design of studied Tag antenna is based on feeding T-match structure. The reactance component of tag antenna considered chip impedance (-163j) is conjugated and matched for maximum power transmission. The antenna is fabricated by using Rogers RT/duroid 5880 dielectric substrate with permittivity 2.2. The size of antenna is 73 × 9.5 × 0.254 mm. The HFSS simulator is used for optimizing the proposed antenna. The antenna Return Loss is of 14.0 dB for the worst case in the middle of UHF range, better than 22.3 dB at 892 MHz.
|124||Wave concept iterative procedure applied to cylindrical conductive pallets|
The WCIP avoids the undesired phenomenon of unbounded operators; relations between currents and fields, obtained using unbounded impedance operators, are transposed to relations between waves, supplied by bounded scattering operators.