Matthias Geissler

Integrated planar multiband antennas for personal communication handsets

The advent of new, multistandard mobile phone devices is an important challenge for antenna designers, as they have to implement integrated antennas with multiband operation within a volume that is rapidly shrinking. In the paper, research results concerning the input return loss, radiation characteristics and efficiency of novel internal, planar, multiband patch antennas are presented.

An improved method for measuring the radiation efficiency of mobile devices

In this paper, an improved method for measuring the radiation efficiency of small devices is introduced. The method is based on Wheelers principle of measuring the antenna impedance within two controlled environments: free space and a closed metallic box. In addition to Wheelers network model, an extended equivalent circuit is introduced, that gives an exact description of the behavior of the small device within the metallic box. This model is the basis for the determination of the radiation efficiency, independent of the size of the box and the location of the device within the box. Several measurements show that using the new method, the radiation efficiency of mobile devices can be determined very quickly and very accurately.

Volume considerations in the design of dual-band handset antennas

Todays mobile phones are becoming smaller and smaller. Integrated antennas have thus a promising future when dealing with dual-band mobile handsets, since size and price requirements favor the use of planar antennas, such as the planar inverted-F antenna (PIFA). Some investigations on the reduction of the volume occupied by dual-band, planar integrated antennas for personal communications handsets are presented.

Novel triple-band antennas for personal communications handsets

The rapid evolution of the mobile phone market requires the development of terminals, which can operate within different nets, and implement different standards. In most cases, these terminals feature multiband antennas. In this paper, some investigations on the influence of plastic carriers on the performance of a novel internal, triple-band patch antenna are presented.

Trends on Handset Antennas

For a long time antennas for handsets were seen as a necessary piece of wire at the end of a high tech system. Due to a strong demand for better performance, lower price and better design the antenna element is getting more and more in the focus of interest This paper presents some actual trends of todays handset antennas. The interaction with the user, the technology of integrated antennas and dualband antenna concepts are explained.

Efficient analysis of complex antenna arrays using Empire XCcel TM

This paper demonstrates the performance of the Empire XCcelTM field solver, which has been used as the design tool for a highly integrated LTCC antenna element for digital beam forming at 30 GHz. The modelling aspects as well as the simulation details will be emphasized.