EP1287584A1 - Antenna system for mobile telecommunications terminals - Google Patents

Abstract

The invention relates to an antenna system for mobile telecommunications terminals, especially devices, which are carried on or attached to or in the proximity of a body part, and to a corresponding band, belt, or strap, which consists of one or more parts and which is attached to the device housing. The antenna is configured as a flat or rod-shaped radiator and is affixed to or in the housing on the top side while extending away from the body part, whereby the band, e.g. a wristband, is fastened to the housing underneath the radiator.

Description

 ANTENNA ARRANGEMENT FOR MOBILE TELECOMMUNICATION TERMINALS

Antenna arrangement for mobile telecommunications terminal devices, in particular devices which are worn or attached to or in the vicinity of a body part.

The invention relates to an antenna arrangement for mobile telecommunications terminal devices, in particular devices which are worn or attached to or in the vicinity of a body part and for this purpose have a one-part or multi-part band, belt or strap which is connected to the device housing , according to the preamble of claim 1,

In recent years, developments in so-called cellphone or wristphone systems have become known which assume that they can wear and use a telecommunications device like a wristwatch. For example, reference is made to the NTT Nippon Telephone and Telegraph PHS Personal Handyphone System, which shows a mobile phone in wristwatch format. A future design from Philips also uses a wristwatch format telephone that can be used to retrieve data from the Internet, make videophone calls and transmit software or video clips. This application should be made possible by a new silicon chip technology. Here, reference is made to the so-called QUBiC 3 technology for chip production, such chips being able to process large amounts of data quickly, as is required, for example, in video technology.

Another recent development is the phone clock from the Korean company Samsung. The telephone clock labeled Anycall has dimensions of essentially 67 'x 58 x 20 mm and combines all the necessary electronic and

Display elements. The antenna arrangement of the Anycall telephone watch extends to the side of the watch case and away from the bracelet above the arm, but is oriented rather close to the surface of this part of the body.

However, it has been shown that with telecommunication devices of this type in the clock format, the previous designs of the necessary antennas couple radiation into the arm of the wearer with the result of an undesired absorption, i.e. worsened antenna gain and possible physical damage.

This disadvantage is particularly relevant if, in the desired further downsizing of telecommunication terminals in watch format, the antenna moves closer to the part of the body to which it is attached simply by scaling.

To avoid undesired coupling of radiation, it has already been proposed in conventional mobile telephones to equip them with a folding or sliding mechanism in such a way that parts of the functional elements, e.g. the input keyboard remains covered, which results in both protection of the operating elements and a space reduction due to the foldable or sliding housing half. In operation, a housing part can be moved in the direction of the radiator by one

To create screen area, which is then between the user's head and the energy radiating antenna. With such a configuration, however, undesirable changes in the reception and transmission properties occur. This is intensified if non-optimized metal surfaces and / or additional active electronic components are arranged in the displaceable housing part.

From the aforementioned, it is therefore an object of the invention to provide an antenna arrangement for mobile telecommunications terminal devices, in particular for devices which are worn or attached to or near a body part. ω ω w N. P> P ¹

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As explained, the antenna of the arrangement is designed as a flat or rod-shaped radiator and is fixed on the top of or in the housing, extending away from the body part. The band, the belt or the strap for attaching the telecommunication terminal to a body part of a wearer is attached to the housing below the radiator so that a e.g. The metallic pin required there does not negatively affect the antenna characteristics because it is located within the feed point.

The housing can have an upper part and a lower part, the antenna starting from the upper part extending laterally in the direction of the band, belt or strap and the band, belt or strap being fastened to the lower part of the housing.

The electrical contacting of the antenna counterweight or the metallic surface to prevent the penetration of high-frequency radiation into the body part is realized via a conductive pin joint, which pin joint can correspond to conventional means for attaching a strap to the housing.

The at least one radiator for forming the antenna can be structurally integrated in a watch case, in particular the upper part of the watch case, or be part of the housing, with several radiators being arranged essentially opposite one another on the watch case and the fastening means for the bracelet being provided on the case below the radiators. This results in advantages in watch design and comfort.

In one embodiment of the invention, in order to further increase the radiator distance from the arm of the wearer, the radiator or radiators can be articulated and pivoted and attached to the watch case. ÜJ o ro t

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1 shows an exemplary embodiment of a telecommunications terminal device in the manner of a wristwatch with a view of the lower housing part with a fastening point for part of the bracelet and an antenna provided on the top;

Fig. 2 is a side view of a wristphone with more

Part of the bracelet before insertion in recesses on the lower part of the case;

3 shows a representation similar to FIG. 1, but with a further bracelet part fastened and an antenna or radiator located above the metallic surface of the bracelet part; and

Fig. 4 is a wristphone attached to the arm of a user with the special antenna arrangement.

In the figures, the housing of the wristphone is provided with the reference symbol 1, at least one radiator 2 extending laterally from the housing 1 in the direction of the bracelet 4. Fastening points 3 for the parts of the bracelet 4 are provided on the lower housing part 6.

2 and 4 in particular make it clear that the radiator 2 provided on one side in the exemplary embodiment shown is located above the bracelet 4 and is at an optimal distance from the surface of the arm 5, so that undesired penetration of high-frequency radiation and absorption thereof are minimized becomes.

The radiator 2 is designed as a flat or rod-shaped radiator and is preferably fixed to the upper housing part 7. The end of the bracelet 4 on the housing side has a metallic surface 8 as an antenna counterweight and to reduce the penetration of high-frequency radiation into the arm 5. Furthermore, an antenna matching section (not shown) connected to the housing 1 or comprising a housing part (not shown) can be provided between the radiator 2 and the metallic surface 8, the electrical contacting of the metallic surface 8 via a conductive pin joint for fastening the bracelet 4 to the housing 1 is done.

1 to 4, the radiator 2 is formed on one side, starting from the bracelet 4 and extending upwards, a further embodiment being based on two opposite radiators which are fixed to the upper part of the housing. There is also the possibility that the radiator (s) are structurally integrated in a non-metallic housing, in particular in the upper part 7.

To change and adjust the radiator distance to the arm of the wearer or for fine adjustment, there is the possibility of articulated and pivotable attachment of the radiator (s) to the U case, in particular to the upper part 7.

In the example shown, the distance between the radiator 2 and the metallic surface 8 of the bracelet 4 is essentially λ / 20. In the UMTS frequency range according to the IMT-2000 standard from 1885 to 2025 MHz, this distance corresponds to approximately 0.5 to 0.7 cm.

It can be seen from the illustrations that, in contrast to known antenna configurations, the radiator does not extend in the longitudinal direction of the arm and runs close to its surface, but rather stands freely upwards and points away from the arm. As a result, both the radiation characteristic is improved and the specific absorption rate is significantly more favorable than in the case of antennas or antennas lying directly on the arm, in which the active radiator is part of the bracelet. cn

Claims

claims

1. Antenna arrangement for mobile telecommunications terminal devices, in particular devices which are worn or attached to or near a body part and for this purpose have a one-part or multi-part band, belt or strap which is connected to the device housing, thereby ge ennzeic net that the antenna is designed as a flat or rod-shaped radiator and is fixed on the top on or in the housing extending away from the body part, the band, the belt or strap being attached to the housing in the direction of use below the radiator.

2. Arrangement according to claim 1, characterized in that the housing has an upper part and a lower part, the antenna starting from the upper part extending laterally in the direction of the band, belt or strap and band, belt or strap are attached to the lower housing part.

3. Arrangement according to claim 1 or 2, characterized in that a metallic surface is provided as an antenna counterweight and to reduce the penetration of high-frequency radiation into the body part at the housing end of the band.

4. Arrangement according to claim 3, characterized in that between the radiator and the metallic surface of the band a connected to the housing or a housing part comprising antenna matching section is provided, the electrical contacting of the antenna counterweight via a conductive pin joint for fastening the Band on the housing.

5. Arrangement according to one of the preceding claims, characterized ge ennzeich et that the telecommunications terminal is designed in the manner of a wristwatch, wherein at least one radiator extends above the bracelet, spaced from the arm of the wearer and connected to the watch case.

6. Arrangement according to claim 5, characterized in that the radiator or radiators are structurally integrated in the watch case, in particular watch case upper part, or constitute part thereof.

7. Arrangement according to claim 5 or 6, characterized in that the radiators of the antenna are arranged substantially opposite one another on the watch case and below the radiators fastening means for the bracelet are provided on the housing.

8. Arrangement according to one of claims 5 to 7, characterized in that to increase the radiator distance to the arm of the wearer or the radiators are articulated and pivotally attached to the watch case.

9. Arrangement according to claim 7, characterized in that the metallic surface is provided on the fastener-side end of the bracelet for forming a counterweight and for shielding and the adaptation section is formed between the radiator and the shield.

10. The arrangement according to claim 9, characterized in that the distance between the radiator and the metallic surface of the strip is substantially λ / 20.

11. The arrangement according to claim 9 or 10, characterized in that the electrical contacting of the metallic surface takes place in the region of the radiator base and essentially oriented to the longitudinal axis of the radiator.