The interaction of a helical antenna, mounted on a mobile handset, with a human head phantom is investigated in this paper. Using the Genetic Algorithms (GA) technique combined with the Method of Moments (MoM), an optimization of the antenna structure is achieved regarding the input impedance at the operating frequency. The Finite Difference Time Domain (FDTD) method is then applied to simulate...

This chapter describes the development and testing of antenna elements for use in a Multiple-input-multiple-output (MIMO) application. MIMO wireless systems have antenna arrays at both the transmitter and receiver terminals. This project focuses on the terminal MIMO antenna array design. The requirements of the antenna element at the terminal are as yet not well-defined but will include (for co...

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 environment. Complex signal samples are used in order to investigate the interference rejection gain with di erent diversity combining schemes...

In recent years, the trend in the mobile communications market has been towards thinner and mechanically more complex terminal devices, which are able to operate in several wireless systems. Due to this development, miniaturization and performance enhancement of internal mobile terminal antennas have become major challenges for the industry of the field. Not only should an internal antenna be s...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Anu Lehtovuori Name of the doctoral dissertation On wideband matching circuits in handset antenna design Publisher School of Electrical Engineering Unit Department of Radio Science and Engineering Series Aalto University publication series DOCTORAL DISSERTATIONS 123/2015 Field of research Circuit Theory Manuscript submitted 21...

Ultra-wideband (UWB) technique has become one of the most fascinating technologies with various antennas. It has the merits of high speed transmission rate, low power consumption and simple hardware configuration over conventional wireless communication systems. The research and development of the UWB systems including antennas have been widely performed [1-5]. Recently, UWB systems have focuse...