Antenna for radio communication terminals

The present invention relates to an antenna for radio-operated Communication terminals.

In particular, with respect to the evolution of the mobile technology antennas are needed, which is able are to cover multiple frequency bands simultaneously. also the market demand for smaller and cheaper Mobile devices. Therefore antennas are required that a have a small footprint, easily for a function in multiple frequency bands or a broadband frequency range are interpretable and cheap to produce.

There are known solutions in which just two or more individual planar inverted-F antenna in a communication terminal to get integrated. Here, then, but several Feed points necessary which then wirings on appropriate are to be addressed, which is an additional expense.

Object of the present invention is to provide an antenna for provide radio-operated communication terminal, which simply is constructed and the same number of frequency bands can cover.

An antenna for radio-operated communication terminal to Achieving the object of the invention is characterized by consisting of several different types of antennas Combination, each antenna type one or more times available and may be the combination of multiple antennas is respectively fed at only one point.

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 of the drawings.

In the drawings<sl><li>Figure 1 shows a perspective schematic view of a possible Embodiment of an antenna according to the present invention, consisting of a planar inverted-F antenna, and a patch antenna,</li><li>Figure 2 shows a perspective schematic view of another possible embodiment of an antenna according to the present Invention, comprising a planar inverted-F antenna and a planar inverted-L antenna,</li><li>3 shows a perspective schematic view of another Embodiment of an antenna according to the present invention, consisting of a patch antenna and a planar Inverted-L antenna,</li><li>4 shows a perspective schematic view of another possible embodiment of an antenna according to the present Invention with a defined separate ground plane,</li><li>Figure 5a to 5m examples of different configurations the radiator elements of other embodiments of an antenna according to the present invention,</li><li>Figure 6 is a schematic sectional view of a shortened Antenna according to the present invention, </li><li>Figure 7 is a schematic sectional view of another shortened antenna according to the present invention,</li><li>Figure 8 is a schematic sectional view of a further shortened antenna according to the present invention,</li><li>9 principle to Figure 11 arrays of invention Antennas for improving emission, and</li><li>Figure 12 is a perspective schematic view of another possible embodiment of an antenna according to the present Invention.</li></sl>

In Figure 1, 1 and 2, the two actual antennas, from which composed the inventive multiband antenna is called, which is illustrated in the figure 1 in Example, a planar inverted-F antenna 1 and to a patch antenna or microstrip antenna 2 is. Of the Mobile unit 3 is shown only a part of the housing wall, which coated with a metallic EMC shielding 4 is. In the illustrated multiband antenna makes this metallic EMC shielding for the two antennas 1 and 2 necessary mass.

The connection between the radiator element of the antenna 1 and the metallic EMC shielding 4 is on the ground connection 5 made. The actual feed point of the antenna is characterized by 6. With 7 is a symbolic coupling of the two antennas 1 and 2 are indicated. This coupling can capacitive, inductive, blasted or galvanized be. By the type of coupling, different parameters may the antenna can be adjusted.

With respect to the antenna configuration shown in Figure 1 it should be noted that the ground connection 5 also selectively, is and multiply selectively possible.

Figure 2 shows a perspective schematic diagram of a Multiband antenna according to the present invention, which of a planar inverted-F antenna 8 and a planar Inverted-L Antenna 9 consists. In the present case, the two antennas 8 and 9 galvanic coupling via a 10 coupled together. Feeding the multiband antenna by means of a feed point 11, the planar with the Inverted-L antenna 9 is connected. The ground connection of the Antenna configuration shown via the ground connection 12th

Figure 3 illustrates an antenna configuration which consists of a Microstrip antenna 13 and a with this galvanically connected planar inverted-L antenna 14 is comprised. The antenna configuration is fed via the feed point 15th

Figure 4 shows an embodiment of an inventive Multi-band antenna in which, in contrast to that of Figure 1 Multiband antenna shown an additional separate ground plane 16 is provided. Since under normal circumstances the Mass ratios within a radio-operated communication terminal are not always fully estimated, ensures the Ground plate 16 for defined mass ratios with respect to the multiband antenna. Between the ground plane and the device ground one or more compounds provided be.

5a to 5m show a small sample selection of differently shaped and coupled to each other Types of antennas according to the present invention. These Selection is by no means limiting. Again, that the Combination of each other coupled antenna types arbitrarily can be.

To shorten the installation length of the antenna according to the invention the radiator element can wavy, as shown in Figure 6 is to be formed, or, as shown in Figure 8, rectangular meander.

In Figure 7 is exemplified that course the ground plane of the shape of the radiating element can adapt.

To improve the radiation characteristics and the bandwidth increase it can be provided that the plane of the radiating element the multiband antenna not completely parallel the metallic EMC shielding of the radio-operated communication terminal runs, but in or at a multiple locations, a larger distance between the antenna and forming the metallic EMC layer. This is an example shown in FIG. 9 The distance can increase, for example, also occur at the feed point of the antenna.

The same problem is illustrated in Figure 10, wherein it is assumed that normally the plane Radiating element of the multi-band antenna adapts the housing history - Shown in Figure 10 dashed - but the radiation properties improve straight continued can be.

Another possibility for improving emission the antenna is shown in principle in FIG 11th

In Figure 12 is a perspective schematic diagram of a partially shortened antenna configuration according to the present Invention. The antenna configuration shown consists of a compressed microstrip antenna 17 and a planar inverted-F antenna 18 which together are electrically connected with the power supply and the connection is carried to ground through the planar inverted-F antenna. At the same time, parts of the actual antenna elements the two antennas have different heights, or inclines on.

Contiguous is noted that the invention Antenna that the problem underlying the invention characterized solves that none, one or more planar inverted-F antennas and / or none, one or more planar inverted-L antennas and / or any one or more microstrip (patch) antennas by coupling to an antenna system together get connected. In the above-illustrated Embodiments are only two different Antennas existing antenna systems shown. however the present invention is not limited thereto.

the antenna structure is fed at only one point. This preferably has a planar inverted-F structure or a planar inverted-L-structure. But there are also solutions conceivable in which the feed via a microstrip structure takes place. The coupling between the individual antenna elements can capacitive, inductive, or blasted be electroplated. By being kind and number of couplings Various parameters of the antenna can be adjusted. For example, if the dimensions of the planar inverted-F antenna and the microstrip antenna as in length to 2: the same, the radiation frequencies as about 1 behave. This can be used when used as a GSM-PCN-antenna.

By proper design of the radiator elements combination a portion thereof for two or more frequency ranges are used, and thereby the overall dimensions of Antenna system be kept small. By cross resonances between the various radiator parts, there may be additional Radiations at other frequencies come.

This planar antenna structure requires a food and a or more ground connections that will be of any design can do certain antenna properties set. The indicated in the drawing connection points for the supply and ground connection can also be exchanged and must not necessarily at the edge or a corner of the radiating structure lie. They are positioned so that for all operating frequency ranges set a desired impedance behavior becomes.

The antenna may have its own ground plane or the metallic parts and surfaces of the radio-operated communication terminal use as a ground plane. The possible additional Ground plane can be of any desired shape and does not necessarily conform to the shape of the radiating element be.

The individual parts of the radiating element may have different Heights, for example by offset or slopes, opposite have the ground plane. To reduce the dimensions longitudinally, the antenna can also by suitable vertical Structuring be compressed or by suitable Folding can be shortened. The type of folds and / or compressions can thereby be carried out as desired and can in different technologies are realized. In this case, the radiating element alone, but also the associated ground plane be structured accordingly. The corresponding shaping the individual antenna elements, the radiation properties continue to change or improve or antenna adapt to the geometry of the housing. In this case, to name eg graduation, slots, tapering, change the Radiator height above the ground plane.

For mechanical reasons, or for improving emission or optimum utilization of the available volume it is also possible, suitable dielectric or introduce magnetic materials in the antenna structure. This may the antenna structure partially but completely fill. It also combinations of different dielectric and / or magnetic substances or air possible. The advantage is the multi-band antenna according to the invention that individual radiator parts, which for example, a planar Inverted-F antenna can be used also for the radiation than an inverted-L antenna or used as a microstrip antenna can be. Here, any combination of Radiating elements and consequently possible additional resultant Antenna structures possible. These allow radiation in other frequency ranges, or can contribute to the further Improvement of one or more radiation behavior be used. Due to the possible use of multiple can radiator parts of the space requirement or volume requirements be kept small. Since one on single base point, ie the Feed point of the antenna impedance, for example 50 Ohm can adjust each frequency range, is no more Wiring necessary. The losses in an otherwise possibly needed feed network are therefore eliminated. Since in the present invention Antennas different depending on the frequency range contribute parts to the radiation, are accidentally at a partial of the antenna with your hand cover not all frequencies equally disturbed. An existing Call connection can thus possibly in an undisturbed Frequency range can be maintained.