COMMUNICATION SYSTEM

• US 20120319916A1
• Filed: 02/12/2009
• Published: 12/20/2012
• Est. Priority Date: 02/14/2008
• Status: Active Grant

• Current Assignee: Wilson Electronics LLC (Wilson Electronics Holdings LLC)
• Original Assignee: Zinwave Limited
• Inventors: Freeman, Benedict Russell, Gears, Trevor, Boz, Zafer, Howe, Graham Ronald, Mezzarobba, Emiliano, Bell, Andrew Robert
• Granted Patent: US 9,960,487 B2
• Time in Patent Office: Days
• US Class Current: 343/841
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 1/525 between emitting and receiving antennas

Abstract

A distributed antenna system (DAS) is described, including a wide band antenna device having respective transmit and receive antennas disposed in a single package and arranged to provide mutual isolation so that in use noise from the transmit antenna is isolated from the transmit antenna, whereby reception is possible at a frequency the same as transmission.

Claims

1. A wide band antenna device having respective transmit and receive antennas disposed in a single package and arranged to provide mutual isolation so that in use noise from the transmit antenna is isolated from the transmit antenna, whereby reception is possible at a frequency the same as transmission.

2. An antenna device according to claim 1, wherein the antennas are disposed in close mutual physical proximity.

3. An antenna device according to claim 1, wherein the antennas are separated by less than twice the wavelength of the lowest frequency.

4. An antenna device according to any preceding claim having stubs disposed generally between the antennas for increasing electrical isolation therebetween.

5. An antenna device according to claim 4, wherein the stubs comprise stubs having a dimension of about a quarter of a wavelength of a lowest transmit/receive frequency.

6. An antenna device according to claim 4, wherein the stubs comprise stubs arranged to provide isolation at around a mid band frequency and at around a highest frequency of said wide band.

8. A system according to claim 1, wherein the system is configured to be able simultaneously to carry the following services over a single uplink and a single downlink;

Tetra;

EGSM900;

DCS1800;

UMTS;

WLAN and WiMax.

11. A system according to any preceding claim, wherein the uplink and the downlink are each adapted to carry signals having frequencies that range between 130 MHz and 2.7 GHz.

7. A distributed antenna system having a hub, at least one remote antenna device having an associated transmit antenna and an associated receive antenna, an uplink providing a path for signals from the hub to the transmit antenna and a downlink providing a path for signals from the receive antenna to the hub, wherein the system is adapted to be able simultaneously to convey a plurality of different communication services.

9. A distributed antenna system having a hub, at least one remote antenna device having an associated transmit antenna and an associated receive antenna, an uplink providing a path for signals from the hub to the transmit antenna and a downlink providing a path for signals from the receive antenna to the hub, wherein each of the uplink and downlink has a compensation device having plural selectable frequency-gain characteristics for providing compensation for frequency-dependent loss in the respective link.

10. A system according to claim 9, wherein the transmit and receive antennas are provided in a single module.

12. A system according to any of claims 7-11, wherein the uplink and the downlink are provided by multimode fibres.

13. A system according to claim 12, wherein launch into the respective fibres provides a restricted number of modes, preferably wherein the launch into the respective fibres is adapted to eliminate lowest order modes and higher order modes.

14. A system according to any of claims 7-11, wherein the uplink and downlink are provided by one or more of single mode fibres and. conductive links such as coaxial cables.

16. A system according to any of claims 7-15, having a filter for extracting command signals from the downlink for controlling the remote antenna device.

17. A system according to any of claims 7-16, wherein the remote antenna device comprises a control device connected to receive signals from the filter, and having an output for controlling components of the remote antenna device.

15. A distributed antenna system having a hub, at least one remote antenna device having an associated transmission antenna and an associated reception antenna, an uplink providing a path for transmission signals from the hub to the transmission antenna and a downlink providing a path for reception signals from the reception antenna to the hub, wherein the system is adapted to be able simultaneously to convey transmission and reception signals of identical frequency.

18. A method of operating a distributed antenna system, the method comprising responding to an electric signal having a predetermined carrier frequency by conveying a corresponding signal of that carrier frequency over a broadband link to an antenna, and radiating a signal of that frequency from the antenna.

19. A method according to claim 18, wherein the link is adapted to carry signals across the band extending from 130 MHz to 2.7 GHz.