Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-09-30
1999-06-29
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455 90, 455101, 455129, 4552771, 343700MS, 343702, H04B 138
Patent
active
059181893
ABSTRACT:
A mobile telephone adaptable to a variety of specialized capabilities comprises a main unit and a plurality of accessory units, each capable of a different specialized function, each being selectively attachable to the main unit. The main unit has a contoured outer surface and an operating system for operation of the mobile telephone and each accessory unit includes a casing having a contoured outer surface containing specialized electronic components. The casing is selectively releasably attachable to the main unit which, when attached to the main unit, generally conforms to the outer surface of the main unit and lies generally within the profile of the main unit when attached to it. Interface contacts on the main unit and on the accessory unit are mutually engageable when the accessory unit is attached to the main unit for electrically interconnecting the specialized electronic components with the operating system. An attachment device is fixed on the outer surface of the casing for releasable attachment to an article of clothing worn by a user. The interface contacts include an antenna interface, an internal data bus, a battery power interface, and a regulated power interface. The accessory units may include an alarm system, a helical antenna with or without a complementary whip antenna, a flat profile antenna with or without a complementary whip antenna, a dual band antenna with or without filtering, a diversity antenna, and an accessory battery module.
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I.J. Bahl et al., Microstrip Antennas, pp. 2-7, 24 and 25, published by Artech House, Inc., Dedham, MA, 1980.
Chin Wellington
Nguyen Lee
Nokia Mobile Phones Ltd.
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