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The size reduction for resonant monopoles is an important issue for HF and VHF antennas. Unfortunately, size reduction results in degradation in both efficiency and bandwidth, as is well known from the fundamental limits on small antennas. This paper firstly introduces a MATLAB-controlled NEC2 simulation tool with genetic algorithm optimization, and uses this to find the optimal position of inductors...
This paper presents a methodology to improve the performance of an UWB circular monopole antenna fed with a coplanar waveguide by coupling the waveguide slowly into the radiating element using a pre-defined curve that satisfies boundary conditions on the contour and its derivatives. The resulting antenna is modelled in Matlab and then transferred to CAD programs for simulation and manufacture using...
This paper describes various miniaturization techniques of multiband antennas for portable transceivers. The considered techniques include folding, meandering and wrapping of the primary radiator. In addition, utilization of ground slots to widen the existing or generate new bands is described. These techniques are illustrated through design examples. Finally, a wideband antenna created by wrapping...
A new invention of wine closure is introduced. By means of this closure, a UHF RFID application for a bottle packaged wine product detection is realized. The application is realized by designing a tag based on a meander line dipole antenna, according to the shape of the new wine closure, so that the tag can be inserted into the closure with good radiation performance. Moreover, this is the first RFID...
A novel wideband polarization diversity antenna that is capable of exciting two orthogonal conical radiation patterns is presented. The antenna consists of four magneto-electric dipoles arranged in a ring configuration above a ground plane and a vertical electric monopole at the center of the ground plane. A matching network is used to combine the signals from the four magneto-electric dipoles to...
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