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Browse Prior Art Database

Wrist Phone with Completely Detachable and Stealthy Antenna System

IP.com Disclosure Number: IPCOM000018858D
Original Publication Date: 2003-Sep-25
Included in the Prior Art Database: 2003-Sep-25
Document File: 8 page(s) / 587K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Small devices like mobile phones can be worn for example on someone's wrist. The wrist phones usually are bulky and unattractive because of the RF (radio frequency) -antenna. The later needs to have a given minimum length to achieve the optimal performance within a given frequency band. Because of the integrated antenna, a user can not utilize functionality of a mobile device that doesn't require an RF-interface within an aircraft. Among the applications that don't require an air interface are the music player, photo-album, display of pictures, editing functionality, etc.. The use of the wrist phones requires cumbersome interaction to answer/make a call (wireless hands-free, or higher sensitivity in the microphone and volume in ear piece). These two approaches use more battery and are not as discreet as regular mobile device usage. The limited size of the wrist phone (to keep its bulkiness to a minimum) affects the amount of functionality that can be provided by the device. The antenna system has been at the least partly integrated in the PCB (Printed Circuit Board) of the mobile device. This means that even if the extensions to the conductive enclosures that transmit RF-radiation into the air are removed, the device will still be able to transmit and receive signal even though badly. As a consequence its use want be allowed inside an aircraft. Also, since part of the antenna system is still in the PCB of the mobile device, the placement of additional elements/functionalities is restricted, and furthermore the mobile device becomes bulky and unattractive.

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© SIEMENS AG 2003 file: 2003J02702.doc page: 1

Wrist Phone with Completely Detachable and Stealthy Antenna System

Idea: Carmen Santa-Cruz, DK-Aalborg

Small devices like mobile phones can be worn for example on someone's wrist. The wrist phones usually are bulky and unattractive because of the RF (radio frequency) -antenna. The later needs to have a given minimum length to achieve the optimal performance within a given frequency band. Because of the integrated antenna, a user can not utilize functionality of a mobile device that doesn't require an RF-interface within an aircraft. Among the applications that don't require an air interface are the music player, photo-album, display of pictures, editing functionality, etc.. The use of the wrist phones requires cumbersome interaction to answer/make a call (wireless hands-free, or higher sensitivity in the microphone and volume in ear piece). These two approaches use more battery and are not as discreet as regular mobile device usage. The limited size of the wrist phone (to keep its bulkiness to a minimum) affects the amount of functionality that can be provided by the device.

The antenna system has been at the least partly integrated in the PCB (Printed Circuit Board) of the mobile device. This means that even if the extensions to the conductive enclosures that transmit RF- radiation into the air are removed, the device will still be able to transmit and receive signal even though badly. As a consequence its use want be allowed inside an aircraft. Also, since part of the antenna system is still in the PCB of the mobile device, the placement of additional elements/functionalities is restricted, and furthermore the mobile device becomes bulky and unattractive.

Description of a new proposal dealing with the points mentioned above:

The proposal considers a mobile unit made of three completely independent parts (a) information unit (Central Processing Unit CPU, main memory, display and menu navigation parts), (b) antenna unit and (c) strap unit. These units are connected together by the element (c), a semi-rigid strap whereby forming a mobile device system. The information unit and antenna system unit might retain a given level of functionality even when detached from each other. One of the inventive steps is therefore, the placement of the complete antenna system in a detachable part of the mobile device system (figure 1). In the preferred embodiment, the antenna part is concealed in the inner part of the user's forearm while the information unit is placed in the opposing part of the forearm. Consequently, the visible part of the mobile device (the information unit) becomes more aesthetically pleasing (Iess bulky) and usable (flatter information units with larger displays), while the mobile device as such maintains the RF-performance thanks to an antenna system of adequate length. Since the latter is placed in the inner part of the forearm is not only stealthy but also comfortable becaus...