Coupling element based mobile terminal antenna structures

Abstract

Abstract-In this paper, internal low-volume antenna structures for mobile terminals are studied. The work concentrates on the possibilities to reduce the volume of mobile terminal antenna elements by efficiently utilizing the radiation of the currents on the mobile terminal chassis. Essentially nonresonant coupling elements are used to optimally couple to the dominating characteristic wavemodes of the chassis. The antenna structures are tuned to resonance with matching circuits. During the last few years, the approach has achieved growing interest-also among industrial manufacturers of mobile terminals. There exist, however, no systematical feasibility and performance studies of the idea. During the work, two antenna models with very low-volume coupling elements are designed and in total four prototypes are constructed. The simulation and measurement results show that the studied antenna concept is a very promising alternative for traditional antenna technologies. The presented analysis provides useful and novel information for the designs of the future low-profile and low-volume mobile terminal antennas.

Metal-Covered Handset With Lte Mimo, Wi-Fi Mimo, and GPS Antennas

“…Ground clearance between the middle frame and the side frame is 2.5 mm in the sides, and 10.2 or 7.8 mm in the ends. The key property of the model is the slotless metallic back cover, seen in Figure 2 The proposed antennas are of Capacitive Coupling Element (CCE) type [20,21], or slot antennas. CCEs are widely used at cellular frequencies due to their wide frequency band and robust performance.…”

A Practical Guide to 3D Electromagnetic Software Tools

“…Specific topologies can be found in [28], [29], [30], [31], [32]. In [30] for example, an internal dualband patch antenna is described. The antenna is simulated and measured and the agreement is excellent for this topology.…”

Near-Field Control of Handset Antennas Based on Inverted-Top Wavetraps: Focus on Hearing-Aid Compatibility

“…The first-order wavemode exists when the chassis is electrically half-wavelength long; see the two lowest order wavemodes. In this letter, the chassis wavemodes are excited with bottom-located capacitive coupling elements (CCEs) introduced in [4]. The two lowest order wavemodes of the chassis introduce the zero of the electrical current in the open-end of the chassis; see Fig.…”