The article presents the development of the subreflector model of a beamwaveguide antenna, starting from the mechanical hardware, proceeding into the rate-loop system, and finally into the position-loop system. The rate-loop model and the position-loop model simulation results were verified with the field data. The analysis showed that the subreflector displays a nonlinear behavior when excited...

smart antennas are one of the most hottest topics in mobile communication. The smart antenna technology can significantly improves wireless system performance and economics for a range of potential users. It enable operators of PC’s cellular and wireless local loop networks to realize significant increase in signal quality, network capacity and coverage. In truth it is not the antenna that is s...

In conventional antennas, such as a monopole antenna and a planar inverted-F antenna (PIFA) for handsets, some gain degradation has been often observed when the operator holds the handsets at a talk position. This is caused by the variation of the current on the conducting box used in the handset due to human body effect. Because of this point, we have to consider reducing the current flow on t...

This paper presents simulated (WIPL‐D pro) and measured results of a UHF RFID antenna realized with a dipole matched to a CPS (Coplanar Stripline) and inductively coupled with a small rectangular loop. Such a design enables achieving and controlling high values of the inductive reactance that is necessary for obtaining good match of the antenna to an Application Specif...