Personal communications apparatus

• US 6,725,057 B1
• Filed: 09/18/2000
• Issued: 04/20/2004
• Est. Priority Date: 10/05/1999
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Boyle, Kevin R.
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): TRINH, TAN H
• Application Number:
  US09/663,945
• Time in Patent Office: 1,310 Days
• Field of Search: 455/550, 455/575, 455/90, 455/269, 455/101, 455/129, 455/272, 455/274, 455/277.1, 455/277.2, 343/700, 343/900
• US Class Current: 455/550.1
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

A personal communications apparatus, for example a cellular telephone handset, has an antenna diversity arrangement comprising first and second antennas (102A, 102B) arranged with their polarisation axes slanted with respect to the median plane of the handset body (218). By a suitable choice of inclination angles one of the antennas can be arranged to be substantially vertical in use, whether by right or left handed users, thereby improving received signal strength from a vertically polarised base station. The arrangement also enhances diversity operation, since the correlation between the field strengths received by the antennas is reduced by their relative orientation.

When the apparatus is used in a system employing a Code Division Multiple Access (CDMA) techniques, the apparatus preferably includes a 2D Rake receiver for mitigating the effects of multipath fading and interference.

Claims

1. A personal communications apparatus, comprising:

a body including a transceiver circuit; and

an antenna diversity arrangement extending from said body, said antenna diversity arrangement including a first antenna and a second antenna,

wherein a first polarization axis of said first antenna and a second polarization axis of said second antenna are oppositely inclined with respect to a median plane associated with said body.

2. The apparatus as claimed in claim 1, wherein the first polarization axis and the second polarization axis are inclined 45°

to 75°

to the median plane.

3. The apparatus as claimed in claim 1 or 2, wherein said transceiver circuitry includes a 2D Rake receiver for processing signals received by said first antenna and said second antenna.

4. The apparatus as claimed in claim 1, further comprising:

a microphone located within said body; and

a loudspeaker located within said body,

wherein an alignment of said microphone and said loudspeaker define the median plane associated with said body.

5. The apparatus as claimed in claim 1, wherein a symmetrical plane of said body defines the median plane associated with said body.

6. The apparatus as claimed in claim 1, wherein said first antenna and said second antenna are inclined toward each other.

7. The apparatus as claimed in claim 1, wherein said first antenna and said second antenna are inclined away from each other.