Learn More
This paper gives a general overview of the design of base station antennas for mobile communications. It explains underlying theoretical and practical implementation aspects in mobile communication networks of today and the future. In the first part the fundamental parameters of a base station antenna are discussed in the context of radio network design. In(More)
The criteria of trustworthiness developed by Guba (1981) can be utilized to both plan and judge evaluations within the naturalistic inquiry paradigm. This article (1) describes the process and results of a study done to evaluate an educational program developed to increase faculty-student contact in a clinical clerkship, (2) applies the criteria of(More)
We report an investigation into the interference rejection capabilities of a dual antenna system on a mobile telephone prototype for the 1800 MHz band. The investigation is done by means of narrowband downlink channel measurements in a microcellular-like e n vironment. Complex signal samples are used in order to investigate the interference rejection gain(More)
Basic properties and new design principles of ultra wideband Vivaldi antennas are presented and discussed in this paper. The focus will be on the modeling of Vivaldi antenna design curves, by which it is constructed; its simulation results, realization and the measurements. According to the aim of this research the discussion starts with the review of the(More)
The development of wireless communication systems into multi-standard radio architectures that can process a multitude of frequency bands and modulation schemes has lead to a growing demand for wideband receiver front-ends. To allow for portability and low cost, these new architectures also need to be low power, compact size integrated circuits with a(More)
Mobile users need more capacity and higher velocity to work with new data applications. In order to satisfy these requirements, mobile systems of third generation were created and they are established every day in more places. Consequently second and third generation of system have to coexist. In this paper is presented a study about the coexistence between(More)