Personal communication terminal with a slot antenna

• US 6,282,433 B1
• Filed: 04/14/1999
• Issued: 08/28/2001
• Est. Priority Date: 04/14/1999
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Holshouser, Howard E.
• Primary Examiner(s): Nguyen, Lee
• Application Number:
  US09/291,738
• Time in Patent Office: 867 Days
• Field of Search: 455/550, 455/556, 455/557, 455/90, 455/272, 455/132, 455/41, 343/702, 343/746, 343/767, 343/768, 343/770, 343/771
• US Class Current: 455/556.2
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 13/085 Slot-line radiating ends
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Abstract

A personal communications terminal includes a telephone unit and an application processing unit that are operatively connected. The telephone unit includes a first RF transceiver for communicating with a cellular communications network via an external dipole antenna. The application processing unit includes a short range transceiver and antenna for connecting the computing device with an external computer or local area network. The short range antenna is a slot antenna formed by a slot in the housing of the personal communications terminal.

Claims

1. A personal communications terminal comprising:

a) a housing made of a conductive material;

b) a telephone unit including a long-range RF transceiver for communicating with a cellular network;

c) a long-range antenna coupled to said long-range RF transceiver for transmitting and receiving RF signals;

d) an application processing unit operatively connected with the telephone unit for running application programs;

e) a wireless network interface operatively connected to said application processing unit including a short-range RF transceiver for wireless communication with a nearby computing device; and

f) a short-range antenna coupled to said short-range RF transceiver for transmitting signals to, and receiving signals from, said nearby computing device, said short-range antenna comprising a slot antenna formed by a slot in said conductive housing of said personal communications terminal so that said housing functions as a ground plane for said slot antenna.

2. The personal communications terminal according to claim 1 wherein said short-range RF transceiver is coupled to said short-range antenna by a coaxial transmission line.

3. The personal communications terminal according to claim 2 wherein said coaxial transmission line is conductively coupled to said short-range antenna.

4. The personal communications terminal according to claim 2 wherein said coaxial transmission line terminates in a coupling loop and is inductively coupled to said short-range antenna.

5. The personal communications terminal according to claim 1 wherein said short-range RF transceiver is inductively coupled to said short-range antenna by means of a coupling loop placed sufficiently close to said slot so that electrical signals are transferred from said coupling loop to said short-range antenna.

6. The personal communications terminal according to claim 1 further including a pair of spring contacts associated with said short-range RF transceiver for coupling to said short-range antenna.

7. The personal communications terminal according to claim 1 further including an infrared module disposed within said housing for infrared communications with said local computing device.

8. The personal communications terminal according to claim 7 wherein said infrared module is positioned behind and aligned with said slot so that infrared signals transmitted and received by said infrared module pass through said slot.

9. A personal communications terminal comprising:

a) a housing made of a conductive material;

b) an electronic circuit contained in said housing, said electronic circuit including a short-range RF transceiver for wireless communication with a nearby computing device;

c) a short-range antenna coupled to said short-range RF transceiver for transmitting signals to and receiving signals from said nearby computing device, said short-range antenna including a slot formed in said conductive housing of said personal communications terminal; and

d) an infrared module disposed within said housing forming an infrared link between said electronic circuit and said nearby computing device, said module being positioned within said housing so that infrared signals transmitted and received by said infrared module pass through said slot.

10. The personal communications terminal according to claim 9 wherein said short-range RF transceiver is coupled to said short-range antenna by a coaxial transmission line.

11. The personal communications terminal according to claim 10 wherein said coaxial transmission line is conductively coupled to said short-range antenna.

12. The personal communications terminal according to claim 10 wherein said coaxial transmission line terminates in a coupling loop and is inductively coupled to said short-range antenna.

13. The personal communications terminal according to claim 9 wherein said short-range RF transceiver is inductively coupled to said short-range antenna by means of a coupling loop placed sufficiently close to said slot so that voltage signals present across said coupling loop are transferred to said short-range antenna.

14. The personal communications terminal according to claim 9 further including a pair of spring contacts associated with said short-range RF transceiver for coupling to said short-range antenna.

15. The personal communications terminal according to claim 9 wherein said electronic circuit is an RF telephone including a long-range RF transceiver for communicating with a cellular communications network.

16. The personal communications terminal according to claim 9 wherein said electronic circuit is a computer.