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In recent years, ultra-high-frequency (UHF) radio frequency identification (RFID) systems have drawn more and more attentions in a wide variety of applications such as retail item management, access control system, electronic toll collection, and etc. By incorporating with a commercial RFID reader, it has been noted that the phased array antenna can be implemented in a RFID system to either control...
Metamaterials are artificially constructed to have special electromagnetic properties not found in nature. In recent years, metamaterial is noted as a new kind of device, and the composite right/left-handed transmission lines have been proposed, which are characterized by antiparallel phase and group velocities and negative refractive index. The materials were termed as left-handed materials due to...
We present design and simulations of a cylindrical electromagnetic cloak which is based on a method employing periodic meshes of transmission-line networks. The cloaked object can be a connected or non-connected mesh of inclusions composed of an arbitrary material. In the example case studied in this work, we cloak a cylindrical mesh of rods made of a perfect electric conductor. Since the period of...
In order to mitigate the problem of unwanted reflections from a homogeneous dielectric lens, a lens based on periodic networks of transmission lines is proposed. Since the propagation constant and the impedance of the network can be varied to a large extent independently from each other, it is possible to realize a lens with a high index of refraction while having almost perfect impedance matching...
In this paper, review of degenerate bandedge (DBE) antenna, followed by variations in plane or in volume to realize multimode and wideband configurations is presented. Ferrite and multilayer substrates are also examined to realize the Magnetic Photonic Crystal (MPC) modes to further improve bandwidth and multifunctionality. Of particular interest in this regard is the use of thin magnetic layers which...
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