WO2001041252A1

WO2001041252A1 - Mobile communications terminal

Info

Publication number: WO2001041252A1
Application number: PCT/DE2000/004264
Authority: WO
Inventors: Stefan Huber; Michael Schreiber; Martin Weinberger
Original assignee: Siemens Aktiengesellschaft
Priority date: 1999-12-02
Filing date: 2000-11-30
Publication date: 2001-06-07
Also published as: DE19958119A1

Abstract

The invention relates to a mobile communications terminal (1) comprising a housing (2) and an antenna device (3) with an antenna (4) that can move in relation to said housing (2). Said antenna is placed in a first position (A) located inside the total dimensions of the housing (2) or close to the housing (2) and can be brought into a second position (B) that is, in essence, located at a distance from the housing (2). The antenna (4) comprises a support (8) which can move in relation to the housing (2) and which has a flat radiator structure (9). The antenna device (3) is in a transmission-ready and reception-ready state when located in each of the positions (A, B) of the antenna (4).

Description

description

Mobile communication terminal

The invention relates to a mobile communication terminal having a housing and having a 7Antenneneinrichtung with a re ^¬ tively to the housing movable antenna which, from a first position in which the antenna half is substantially inner ^¬ the overall dimensions of the housing or applied to the housing can be brought into a second position, in which the antenna essentially protrudes from the housing.

Such a device is known for example from DE 197 47 581 AI. The mobile radio device shown there has a retractable or retractable antenna, no voice data being transmitted in the folded state and voice data being transmitted in the unfolded state. This means that when the antenna is folded or pushed in, the device is only in stand-by mode and is able to receive a call. The device is only fully ready to send and receive when the antenna is unfolded. Such an insertable or retractable antenna has the advantage that the device, when it is not being used for telephoning, is relatively small when retracted and can also be carried inconspicuously by the user in smaller pockets, for example in a suit pocket.

For an inconspicuous use of the device, the device should not only be as small and inconspicuous as possible, not only in stand-by mode, but also when fully operational. Folding out, swinging out or pulling out antennas therefore generally does not correspond to the consumer request.

The desire for devices that are ever smaller and less noticeable inevitably entails the demand for antennas that are still smaller. One way to antennas with sufficient performance relatively inconspicuous accommodate in the housing of the device is to USAGE an antenna having a radiating structured surface ^¬, for example so-called "patch" ¹ antennas or "PCB. ^* - antennas (Printed Circuit Board) Regardless of the Quality of the antenna itself, there is always the problem with such integrated antennas in handheld devices that it is very likely that the hand of the user will cover a larger area of the radiating antenna surface and thereby reduce the performance of the antenna Mobile devices are being constructed ever flatter and the distance between the radiating parts of the device and the head is decreasing, which means that the radiation into the user's head increases, of course, and a critical limit has already been reached.

It is the object of the present invention to provide an alternative to the known state of the art, which on the one hand meets the wishes of consumers for small mobile radio devices that are inconspicuous even in use, and on the other hand the technical requirements for good antenna performance and thus the greatest possible range with sufficient transmission quality.

This object is achieved according to the invention in that the antenna has a support with a flat radiation structure that is movable with respect to the housing and that the antenna device is in a state ready for transmission and reception in each of the positions of the movable antenna.

The device according to the invention thus offers the advantage that it has an antenna device with a flat antenna, which in the normal state is folded or inserted into the housing of the device. The housing can therefore be designed to be relatively flat, as desired, despite good antenna performance. Since the antenna is ready to send and receive even in the inserted or retracted position, the advises to be used very inconspicuously when folded.

Especially in the places where it is desirable to use a relatively inconspicuous mobile device, i. H. in busier places, in the office etc., these are usually locations where there is better reception anyway thanks to a well-developed network. The coverage of the antenna by the user's hand is therefore not so critical in these areas.

As soon as the user is in an area in which the reception conditions are not so good, he can fold out, extend or extend or swing out the antenna and thus improve the performance of the antenna device. On the one hand, when the antenna is unfolded, it is no longer covered by the hand, i.e. the antenna behavior is improved in the free field. In addition, the antenna can be folded down into the second position so that it is further away from the head even with flatter devices. With the same transmission power, there is therefore a reduced SAR (Specific Absorption Rate). This means that the radiation into the user's head is reduced. In principle, the transmission power could then be increased in order to maintain the same limit values, which in turn contributes to a greater range and improved connection quality. Conversely, it is of course also possible, if, for example, the reception conditions are good, to bring the antenna into the position with the improved antenna behavior and to reduce the transmission power accordingly. That is, on the one hand, power could be saved, which leads to a longer battery life and, on the other hand, the SAR value could be further reduced at the same time.

Of course, there is also the possibility that the antenna not only in two different states, but in several states can be spent, in which the antenna shows a different behavior.

In a preferred embodiment, the movable antenna itself is designed such that it is in a ready-to-transmit and receive state in each of the positions.

For this purpose, the movable antenna is particularly preferably constructed in such a way that the movable carrier with the radiation structure has a mass structure which is consequently also moved and is therefore fixed in any position of the antenna with respect to the radiation structure. Such an antenna with a fixed, fold-out mass with respect to the radiation structure has the advantage that the antenna has a very similar antenna performance in each of the positions. The decisive difference of the antenna in the folded and unfolded state essentially consists only in the fact that the antenna is shielded or at least detuned by the hand of the user in the folded state.

Alternatively, there is also the possibility that the antenna device has a second antenna, quasi as an auxiliary antenna, which is ready to transmit and receive at least when the movable antenna is in a position in which it is not ready to transmit and receive. This embodiment with a combination of an antenna permanently integrated in the device and an adjustable antenna is necessary or useful if the structure of the movable antenna used can or should only work in the extended state due to its physical or constructive nature.

The basic principles of the antennas used are arbitrary and can be adapted to the requirements, for example the desired radiation characteristic, the bandwidth, the radiation into the head. It is conceivable, for. B. the combination of a conventional, very small stub antenna, e.g. B. a fixed helix antenna to combine with such a movable antenna.

When using multiple antennas, it can e.g. B. also possible that not only one of the radiating elements is active, but several at the same time. For example, only the permanently integrated "auxiliary" antenna can be active in the retracted state, while both antennas are active at the same time in the extended state. The antenna properties of the permanently integrated antenna can depend on the current position of the movable antenna. For example, the power of both antennas can be combined, as in the so-called "diversity method", by adding the radiation power at favorable phases so that the performance of the entire antenna device is higher than the performance of the respective individual antennas.

In principle, the movable antenna can have any radiation structure. For example, it can also consist of several individual radiation structures, which are either independent of one another or in some way, e.g. B. are only partially coupled together. Likewise, the various antennas can also be coupled with one another as desired. The coupling can take place in each case by appropriate networking via impedances or, in the case of different radiation structures, by a capacitive and / or inductive coupling or radiation coupling. All antennas and structures can be designed as single-band or as multi-band antennas as required.

The invention is explained in more detail below with reference to the accompanying drawings. All of the features mentioned in the individual exemplary embodiments can be essential to the invention not only in the respective combinations, but also in isolation or in other combinations. They represent: Figure 1 is a schematic representation of the basic principle of a fold-out flat antenna;

Figure 2 is a schematic representation of the basic principle of a fold-out antenna with a thicker support with an additional ground plane;

Figure 3 is a schematic representation of the basic principle of an extendable flat antenna;

Figure 4 is a schematic representation of the basic principle of a telescopic antenna with a thicker support with an additional ground surface;

FIG. 5 shows a schematic illustration of a narrow, fold-out antenna;

Figure 6 is a schematic representation of a narrow extendable antenna;

FIG. 7 shows a schematic representation of a narrow antenna which can be rotated out;

FIG. 8 shows a schematic cross section through an extendable antenna according to FIG. 4 with an additional ground plane;

FIG. 9 shows a schematic section as in FIG. 8, but without a ground plane;

FIG. 10 shows a schematic illustration of the combination of a permanently integrated antenna with an extendable, narrow antenna;

FIG. 11 shows a schematic illustration of a combination of a permanently integrated antenna with a wide, extendable antenna; FIG. 12 shows a schematic illustration of an extendable antenna with a plurality of radiation structures on a carrier;

FIG. 13 shows a schematic illustration of a combination of several permanently integrated antennas with several extendable antennas.

All of the mobile communication terminals 1 according to the invention shown in the figures each have a housing 2, in which there is an antenna device 3. In the exemplary embodiments according to FIGS. 1 to 12, this antenna device 3 consists either of one or two antenna systems 4, 5.

One of the antennas 4, 5 or the individual antenna 4 can in each case be brought from a first position A, m the antenna 4 is located essentially within the overall dimensions of the housing 2 or to the housing 2, m a second position B, m which essentially projects the antenna 4 from the housing 2. This mobile, i.e. H. fold-out, extendable or extendable or unscrewable antenna 4 each has a support 8 movable with respect to the housing 2 with a flat radiation structure 9. The antenna device 3 is designed overall so that m each of the positions A, B of the movable antenna 4, the antenna device 3 or the device 1 m is a fully ready-to-send and receive state.

FIG. 1 shows the basic principle of a simple, very flat antenna 4 which can be folded out. This antenna 4 essentially consists of an electrically conductive radiation structure 9 on a flat carrier 8. The radiation structure 9 can be of almost any shape and size and is convenient to the Transmission and reception specifications, for example the desired center frequency, bandwidth or directional characteristic are adapted. Of course, the radiation structure 9 and the size and shape of the carrier 8

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whether the antenna is 4 m in position A or m in position B.

In all devices 1 shown so far, the movable antenna 4 is in each case arranged on an upper side of the housing 2 facing away from the head of the user of the mobile telecommunications device on the head of the user. This means that the radiation structure 9 of the antenna 4 is shielded from the head of the user, the ear of which is usually located on the loudspeaker 18 of the mobile telephone 1, in the inserted state by a ground surface 19 located on a circuit board 20. Of course, the antenna 4 can also be arranged at any other desired location on the housing, for example below.

Within the housing 2 there is a coupling device 12, which ensures that the radiation structure 9 m of the desired position A, B is coupled to a transmission / reception device (not shown) of the mobile telephone 1 and the received signals to the transmission / reception device forwards or emits signals coming from the transmitting / receiving device.

FIG. 10 shows a combination of a narrow telescopic antenna with a small integrated antenna 5. Both antennas are connected to the transmitting / receiving device via a common coupling device 12. FIG. 11 shows an alternative exemplary embodiment with a wide extendable antenna.

When using a plurality of antennas 4, 5, the coupling device 12 can also be used as a switching device, so that according to position A, B of the movable antenna 4, either only the movable antenna 4 or the integrated antenna 5 or both antennas 4, 5 with the broadcast

/ Reception unit are connected. Of course, instead of a combined coupling and switching device separate coupling devices and switching devices can also be used. The coupling or switching means Kgs ^¬ NEN here preferably m the respective mechanical holding tion for the moveable antenna may be integrated, so that a good contact of the radiating surface to the transmitting / Empfangsemheit is possible in a simple manner.

FIG. 12 shows an exemplary embodiment with an extendable antenna 4 with two independent radiation structures 9, 10 which are coupled to one another via coupling devices 12, 13. In the inserted state, the radiation structure 9 is connected to the radiation structure 10 via the coupling 13, which in the simplest case consists, for example, of two interconnected contacts, which are in each case attached to the structures 9, 10, and possibly elements for matching the impedances. They therefore form a common structure. This interrelated combination of two structures 9, 10 is connected to the transmitting / receiving unit via the coupling device 12 via the structure 9.

In the extended state, only the radiation structure 10 contacts the coupling device 12. Since the coupling device 13 remains stationary in the housing 2 when the antenna 4 is pushed out, a coupling between the radiation structure 9 and the radiation structure 10 takes place only on a capacitive or inductive basis Paths instead. The antenna properties are therefore different when extended and inserted.

Of course it is also possible to use the optional

To omit the coupling device 13, so that only the radiation structure 9 is in contact with the coupling 12 in the inserted state, and only the radiation structure 10 in the extended state. The other structures 9, 10 are then only coupled in both positions A, B via a capacitive or inductive path instead. Instead of the radiation structures 9, 10 or mass structures 11 shown in the figures, which are located planar on the surface of the carrier 8, it is of course also possible for the radiation structures 9, 10 or mass structures 11 to run arbitrarily in the volume of the carrier 8. In principle, it is even conceivable that certain cable runs leave the volume of the support 8 or protrude beyond it.

FIG. 13 shows a combination of an antenna 5 permanently integrated in the housing, a fixed stub antenna 6 and two movable antennas 4, 7. The combination of any number of antennas permanently integrated with any number of extendable or foldable antennas can be useful to z. B. to be able to operate different frequency ranges or to enable the antenna diversity mentioned, in which the performance is increased by the interaction of two or more antennas operated simultaneously. The antennas do not need to be directly next to each other, but can also be located at more distant locations on the device.

Of course, the invention is not limited to mobile telephones, but can also be used with all other mobile communication terminals, for example pagers, palmtops or organizers with a corresponding connection to a radio network in which the smallest possible dimensions are desired.

Claims

claims

1. Mobile communication terminal (1) with a housing (2) and with an antenna device (3) with an antenna (4) which is movable relative to the housing (2) and which extends from a first position (A) in which the antenna (4 ) applied substantially in ^¬ nerhalb the overall dimensions of the housing (2) or on the housing (2), located is brought into a second position (B), in which the antenna (4) extending substantially from the housing (2), characterized characterized that the

Antenna (4) has a support (8) movable with respect to the housing (2) with a flat radiation structure (9) and the antenna device (3) in each of the positions (A, B) of the movable antenna (4) in a transmitting and is ready to receive.

2. Communication terminal according to claim 1, characterized in that the movable antenna (4) itself in each of the positions (A, B) is in a state ready for transmission and reception.

3. Communication terminal according to claim 1, characterized in that the antenna device (3) has a second antenna (5) which is ready to transmit and receive at least when the movable antenna (4) is in a position in which it is not ready to send and receive.

4. Communication terminal according to claim 3, characterized in that in the first position (A) of the movable antenna (4) only the second antenna (5) is ready to transmit and receive and in the second position (B) the movable Antenna both antennas are ready to send and receive.

5. Communication terminal according to claim 3 or 4, characterized in that the radiation properties of the second antenna (5) can be changed as a function of the position of the movable antenna (4).

6. Communication terminal according to one of the preceding claims, characterized in that the movable antenna (4) m of each of the positions (A, B) has a different directional characteristic.

7. Communication terminal according to one of the preceding claims, characterized in that the movable antenna (4) is arranged on one of the use positions of the mobile telecommunications device (1) on the head of the user, upper side of the housing (2) facing away from the head ,

8. Communication terminal according to one of the preceding claims, characterized in that the movable carrier (8) in addition to the radiation structure (9) has a mass structure (11).

9. Communication terminal according to one of the preceding claims, characterized in that the movable carrier (8) has a plurality of separate radiation structures (9, 10).

10. Communication terminal according to claim 9, characterized in that the radiation structures (9, 10) are at least partially coupled to one another.

11. Communication terminal according to one of the preceding claims, characterized in that the different antennas (4, 5, 6, 7) and / or the different radiation structures (9, 10) are designed for different resonance frequencies.

12. Communication terminal according to one of the preceding claims, characterized in that the antenna device (3) is connected via a coupling device (12) to a transmitting / receiving part.

13. Communication terminal according to claim 12, characterized in that the coupling device (12) enables switching between different antennas of the antenna device (3) and / or radiation structures (9, 10) of an antenna (4) and / or impedance converters.

14. Communication terminal according to claim 12 or 13, characterized in that the coupling device (12) and / or a separate switching device is at least partially integrated in a mechanical holder (15) for the movable antenna (4).