Antenna for wireless communication terminal device

The present invention relates to an antenna for radio-operated Communication terminals, in which the actual located antenna structure of a on a PCB any shape containing PCB formed becomes.

With respect to the evolution of the mobile technology Antennas are needed which are capable of more cover frequency bands simultaneously. Also requires the Market for ever smaller and cheaper mobile devices. Therefore antennas are required, the small footprint have problems for a function in multiple frequency bands or a broadband frequency range interpretable are cheap and reproducible manner.

The previous concepts such. As the helix wire antennas or the microstrip line antennas all have the disadvantage, that they have either too high a space or tunability without at a multi-band function Another possible.

Object of the present invention is to provide an antenna of initially specify the type mentioned, the small footprint which is interpretable for multiple frequency bands and is inexpensive to manufacture.

This object is for the aforementioned antenna characterized achieved in that a multilayer printed circuit board is provided, wherein on each layer of the multilayer printed circuit board, a different Antenna structure is applied.

The antenna of the invention is easy and cheap to produce, requires little space and is easily for a function in several frequency bands, or in a broadband frequency range interpretations.

Further expedient refinements of the inventive antenna result from the dependent claims and from a following description of embodiments with reference the drawing.

In the drawings<sl><li>Figure 1 to Figure 8 possible configurations of the individual Antenna structures,</li><li>Figure 9A to Figure 9D and 10 shows the exemplary structure a multilayer antenna, and</li><li>Figures 11A to 11D and 12 shows another exemplary Construction of another multilayer antenna.</li></sl>

The individual antenna structures formed by different circuit board conductors in the different layers of multilayer printed circuit board. Thereby, the antenna structures, the shapes shown as an example in Figures 1 to 8, but also beyond forms, accept. Preferably has the interconnect in the form of a meander, a serpentine or the form of a rod. The conductor tracks can itself is also as shown in Figures 5 and 6, branch and at different points B to N1, which in a Plane, forming. Furthermore, it is possible that, in a Location respective plurality forming an antenna conductor side by side are arranged.

In Figures 9A to 10 a four-layer antenna according of the present invention. In the figures 9A- 9D, the individual antenna structures in the four layers shown. 10 shows a schematic cross-section through this four-layer antenna. It can be seen that two layers within the multilayer printed circuit board and two Locations outside the multilayer printed circuit board are.

It should at this point some general remarks be made to the antenna of the invention. This one presented multilayered multiband antenna consists of a or more multilayer printed circuit boards. The material from the one of these boards is, can be freely selected, but should be high frequency compatible. It may in particular Case be pliable flexible material. At each location can be structured an interconnect, which spotlights a or represents another any electric element.

The antenna consists of more than two layers, so at least of three layers. Of these layers at least one is within of the material. The layers are preferably, but not necessarily, parallel to each other. You can store any location taking each other. The documents may be arbitrary at each Position of the board are, and any also have different thickness. So there are also documents possible on the sides and on the long sides. furthermore also inclined positions are possible.

Preferably, only a trace has (a radiator) to a position a feed point. This feed point is about a contact element with the RF module of the communication terminal verbundenn.

All other emitters are preferably excited by coupling. It can also be two or more units on a situation are.

However, it is also one or more direct electrical Connections between one or more spotlights on different layers using via or contact prepared via a side surface at any point will.

One such example of a via is in Figures 11A to 11D and 12. FIG. This is is a four-layer multi-band antenna, the antenna structures those shown in Figures 9A to 9D and Figure 10 Embodiment correspond. In contrast to the Previously described embodiment are in this embodiment the plotted in Figure 11A and 11C Layers by means of a via, as shown in Figure 12 to is seen together.