Antenna Device For A Radio Base Station In A Cellular Telephony System

• US 20070268193A1
• Filed: 12/30/2004
• Published: 11/22/2007
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Johansson, Martin, Petersson, Sven, Engstrom, Ulrika
• Granted Patent: US 9,147,943 B2
• Time in Patent Office: Days
• US Class Current: 343/756
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/245 provided with means for varying the polarisation polarising devices H01Q15/24; tracking by comparing linear polarisation compounds G01S3/146; reducing depolarisation effects H04B7/00; polarisation diversity H04B7/10
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 2001/0408 with power amplifiers
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

The invention discloses an antenna device (500, 600, 700) for a radio base station in a cellular telephony system, which comprises a first and a second input connection for a first (D1) and a second (D2) data stream, and a first (510, 610, 710) and a second (511, 611, 711) polarization former, one for each of said data streams. The device also comprises a first (530, 630, 730) and a second (532, 632, 732) antenna of respective first and second polarizations, and one amplifier each. The device also comprises a first (515, 615, 715) and a second (516, 616, 716) combiner, so that the outputs from the polarization formers may be combined as input to each of the first and second antennas.

Claims

1. An antenna device for a radio base station in a cellular telephony system, the device comprising a first and a second input connection for a first and a second data stream, and a first and a second polarization former, one for each of said data streams, the device also comprising a first and a second antenna of respective first and second polarizations, the antennas also comprising one amplifier each, characterized in that the device additionally comprises a first and a second combiner, so that the outputs from the polarization formers may be combined as input to each of the first and second antennas.

2. The antenna device of claim 1, in which each of the first and second antennas each comprise at least one radiation element which have the same phase centers.

3. The antenna device of claim 1, in which each of the first second polarization formers deliver two outputs, which can then be combined as input to said first and second antennas.

4. The device of claim 1, in which said polarization formers can split an incoming data stream into two data streams and output said two data streams with a phase difference between them, a first of said data streams being used as input to a first of said combiners, and a second of said data streams being used as input to a second of said combiners.

5. The antenna device of claim 1, in which at least one of the first or second antennas additionally comprises at least one more radiation element of the same polarization as the first antenna element of that antenna, the device additionally comprising a beam former for that antenna, said beam former being connected by its outputs to at least two of the radiation elements in said antenna, said beam former using as its input one of said data streams output from said polarization formers.

6. The device of claim 5, in which said beam former can split an incoming data stream into two data streams and output said two data streams with a phase difference between them, a first of said data streams being used as input to a first of said combiners, and a second of said data streams being used as input to a second of said combiners

7. The antenna device of claim 4, additionally comprising input connections for at least a third data stream, the device also comprising a first additional beam former for said at least third data stream, said input connection connecting the data stream to said first additional beam former, the outputs from said beam former being used as input to at least two of said combiners.

8. The device of claim 7, also comprising an additional polarization former for said at least third data stream, as well as a second additional beam former for said at least third data stream, said third data stream being used as input to said additional polarization former, a first output of which is used as input to the first additional beam former and a second output of which is used as input to the second additional beam former.