Broadband transceiver and distributed antenna system utilizing same

• US 10,270,152 B2
• Filed: 09/01/2010
• Issued: 04/23/2019
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Inventors: Phillips, Fred William, Kummetz, Thomas, Izzat, Narian
• Primary Examiner(s): Lu, Zhiyu
• Application Number:
  US12/873,742
• Publication Number:
  US 20110243201A1
• Time in Patent Office: 3,156 Days
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/525 between emitting and receiving antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system

Abstract

A broadband transceiver includes at least one layer structure that is substantially impermeable to RF radiation. The layer structure includes a first face surface substantially opposite a second face surface. A receive antenna is located proximate the first face surface and configured to receive RF transmissions. A transmit antenna is located proximate the second surface and configured to transmit RF transmissions. At least one of the receive and transmit antennas generates a generally toroidal radiation pattern that is stronger in a direction substantially parallel to the respective layer structure face surface compared to a direction substantially perpendicular to the face surface.

Claims

1. A broadband transceiver, comprising:

at least one layer structure that is substantially impermeable to RF radiation, the at least one layer structure including a first face surface substantially opposite a second face surface;

at least one dedicated receive antenna located proximate the first face surface and configured to receive RF transmissions; and

at least one dedicated transmit antenna located proximate the second face surface and configured to transmit RF transmissions by generating a generally toroidal radiation pattern that is stronger in a first direction that is substantially parallel to the second face surface compared to a second direction that is substantially perpendicular to the second face surface;

wherein the at least one layer structure provides isolation between the at least one dedicated receive antenna and the at least one dedicated transmit antenna that is necessary for simultaneous transmission and reception of the RF transmissions with a user device;

wherein the broadband transceiver is configured to simultaneously transmit and receive RF transmissions with the user device without needing additional elements other than the at least one layer structure to provide the isolation between the at least one dedicated receive antenna and the at least one dedicated transmit antenna; and

wherein the broadband transceiver is configured to transmit RF transmissions using the at least one dedicated transmit antenna, wherein the broadband transceiver is configured to receive RF transmissions using the at least one dedicated receive antenna.

2. The broadband transceiver of claim 1, further comprising:

a low noise amplifier configured to amplify analog communication signals received by the at least one dedicated receive antenna prior to transmitting the analog signals to the user device; and

a power amplifier configured to amplify analog communication signals received from the user device prior to transmitting the analog signals over the at least one dedicated transmit antenna.

3. The broadband transceiver of claim 1, further comprising:

a digital signal processor configured to interface with a device;

a transmitter circuit configured to transmit downlink communication signals for radiation by the at least one dedicated transmit antenna, the digital signal processor being configured for receiving the downlink communication signals from the device; and

a receiver circuit configured to transmit uplink communication signals detected by the at least one dedicated receive antenna to the device via the digital signal processor.

4. The broadband transceiver of claim 3, wherein the digital signal processor is configured to communicate with the device over an interface selected from a group consisting of:

an optical fiber communication interface, a waveguide, an electrical cable communication interface, a free-space laser link, and combinations thereof.

5. The broadband transceiver of claim 3, wherein the transmitter circuit comprises:

a digital to analog converter configured to receive the downlink communication signals from the digital signal processor and convert the downlink communication signals from digital to analog form;

up-converter circuitry configured to convert a frequency of the downlink communication signals from an intermediate frequency to a frequency for transmission over the at least one dedicated transmit antenna; and

a power amplifier configured to amplify the up-converted communication signals prior to transmitting over the at least one dedicated transmit antenna.

6. The broadband transceiver of claim 3, wherein the receiver circuit comprises:

a low noise amplifier configured to amplify the uplink communication signals received from the at least one dedicated receive antenna;

down-converter circuitry configured to convert a frequency of the uplink communication signals from a receive frequency to an intermediate frequency; and

an analog to digital converter configured to convert the down-converted uplink communication signals from analog to digital and for use by the digital signal processor.

7. The broadband transceiver of claim 1, wherein at least one of the at least one dedicated receive antenna and the at least one dedicated transmit antenna is selected from a group consisting of a broadband monopole antenna, a dipole antenna, an inverted cone antenna, a bow-tie monopole antenna, and combinations thereof.

8. The broadband transceiver of claim 1, wherein the RF impermeable layer structure is configured for being oriented in a space in a substantially vertical orientation with respect to a floor for the at least one dedicated transmit antenna to generate the generally toroidal radiation pattern that is stronger in a vertical direction compared to a horizontal direction.

9. The broadband transceiver of claim 1, wherein the RF impermeable layer structure is configured for being oriented in a space in a substantially horizontal orientation with respect to a floor for the at least one dedicated transmit antenna to generate the generally toroidal radiation pattern that is stronger in a horizontal direction compared to a vertical direction.

10. The broadband transceiver of claim 9, wherein the at least one dedicated transmit antenna is positioned between the floor and the at least one dedicated receive antenna.

11. The broadband transceiver of claim 1, wherein the broadband transceiver is configured for being mounted in a space having a ceiling surface and a floor surface, the RF impermeable layer structure being oriented such that the first face surface with the at least one dedicated receive antenna is spaced from and facing the ceiling surface and the second face surface with the at least one dedicated transmit antenna is spaced from and facing the floor surface.

12. The broadband transceiver of claim 11, wherein the broadband transceiver is configured for being mounted in the space and elevated with respect to the floor surface.

13. The broadband transceiver of claim 1, wherein a plurality of receive antennas are located on the first face surface.

14. The broadband transceiver of claim 1, wherein a plurality of transmit antennas are located on the second face surface.

15. The broadband transceiver of claim 1, wherein the at least one layer structure includes an RF choke positioned on the layer structure between the first face surface and the second face surface.

16. The broadband transceiver of claim 1, wherein the at least one dedicated receive antenna is configured as a bow-tie monopole antenna, the broadband transceiver further comprising:

at least one RF choke extending substantially perpendicular from the first face surface, wherein the at least one RF choke is positioned in line with the at least one dedicated receive antenna, and

wherein a plane of the at least one RF choke is substantially parallel to a plane of the at least one dedicated receive antenna.

17. The broadband transceiver of claim 16, wherein the at least one dedicated transmit antenna is configured as a bow-tie monopole antenna, the broadband transceiver further comprising:

at least one RF choke extending substantially perpendicular from the second face surface,

wherein the at least one RF choke is positioned in line with the at least one dedicated transmit antenna,

wherein a plane of the at least one RF choke is substantially parallel to a plane of the at least one dedicated transmit antenna, and

wherein the at least one dedicated transmit antenna and the at least one RF choke on the second face surface are rotated approximately ninety degrees from that of the at least one dedicated receive antenna and the at least one RF choke on the first face surface.

18. The broadband transceiver of claim 1, wherein the at least one layer structure includes at least one high impedance surface for resisting a propagation of surface waves, the at least one high impedance surface including a rough layer, a coating layer of high impedance material or an adhered layer of high impedance material.

35. The broadband transceiver of claim 1, wherein the dedicated receive antenna is adapted to have a generally toroidal receiving pattern that is stronger in the first direction that is substantially parallel to the first face surface compared to the second direction that is substantially perpendicular to the first face surface.

36. The broadband transceiver of claim 1, wherein the broadband transceiver is in a remote unit of a distributed antenna system that includes a master unit or a base transceiver station configured for transceiving communication signals, wherein the remote unit is configured for transceiving the communication signals with the master unit and for communicating with one or more user devices.

40. The broadband transceiver of claim 1, wherein the broadband transceiver does not include the additional elements.

41. The broadband transceiver of claim 1, wherein the additional elements include at least one of a filter, a duplexer, and a circulator.

42. The broadband transceiver of claim 1, wherein the broadband transceiver does not include at least one of a filter, a duplexer, and a circulator.

43. The broadband transceiver of claim 2, wherein the low noise amplifier is directly connected to the at least one dedicated receive antenna;

and

wherein the power amplifier is directly connected to the at least one dedicated transmit antenna.

19. A system comprising:

at least one of a master unit or a base transceiver station configured for transceiving communication signals;

at least one remote unit for transceiving communication signals with the master unit or base transceiver station and communicating with one or more user devices, the remote unit including a broadband transceiver comprising;

at least one layer structure that is substantially impermeable to RF radiation, the at least one layer structure including a first face surface substantially opposite a second face surface;

a dedicated receive antenna located proximate the first face surface and configured to receive RF transmissions; and

a dedicated transmit antenna located proximate the second face surface and configured to transmit RF transmissions by generating a generally toroidal radiation pattern that is stronger in a direction substantially parallel to the second face surface compared to a direction substantially perpendicular to the second face surface;

wherein the at least one layer structure provides isolation between the at least one dedicated receive antenna and the at least one dedicated transmit antenna that is necessary for simultaneous transmission and reception of the RF transmissions with a user device;

wherein the broadband transceiver is configured to simultaneously transmit and receive RF transmissions with the user device without needing additional elements other than the at least one layer structure to provide the isolation between the at least one dedicated receive antenna and the at least one dedicated transmit antenna; and

wherein the broadband transceiver is configured to transmit RF transmissions using the dedicated transmit antenna, wherein the broadband transceiver is configured to receive RF transmissions using the dedicated receive antenna.

20. The system of claim 19, the broadband transceiver further comprising:

a digital signal processor configured to interface with the master unit;

a transmitter circuit configured to transmit downlink communication signals for radiation by the dedicated transmit antenna, the digital signal processor being configured for receiving the downlink communication signals from the master unit; and

a receiver circuit configured to transmit uplink communication signals detected by the dedicated receive antenna to the master unit via the digital signal processor.

21. The system of claim 20, wherein the digital signal processor is configured to communicate with the master unit over an interface selected from a group consisting of:

an optical fiber communication interface, a waveguide, an electrical cable communication interface, a free-space laser link, and combinations thereof.

22. The system of claim 20, wherein the transmitter circuit comprises:

a digital to analog converter configured to receive the downlink communication signals from the digital signal processor and convert the downlink communication signals from digital to analog form;

up-converter circuitry configured to convert a frequency of the downlink communication signals from an intermediate frequency to a frequency for transmission over the dedicated transmit antenna; and

a power amplifier configured to amplify the up-converted communication signals prior to transmitting over the dedicated transmit antenna.

23. The system of claim 20, wherein the receiver circuit comprises:

a low noise amplifier configured to amplify the uplink communication signals received from the dedicated receive antenna;

down-converter circuitry configured to convert a frequency of the uplink communication signals from a receive frequency to an intermediate frequency; and

an analog to digital converter configured to convert the down-converted uplink communication signals from analog to digital and for use by the digital signal processor.

24. The system of claim 19, wherein at least one of the dedicated receive antenna or the dedicated transmit antenna is a broadband monopole antenna.

25. The system of claim 19, wherein a plurality of receive antennas are located on the first face surface and a plurality of transmit antennas are located on the second face surface.

26. The system of claim 19, wherein the at least one layer structure includes an RF choke positioned on the layer structure between the first face surface and the second face surface.

27. The system of claim 19, wherein the dedicated receive antenna is configured as a bow-tie monopole antenna, the system further comprising:

at least one RF choke extending substantially perpendicular from the first face surface,

wherein the at least one RF choke is positioned in line with the dedicated receive antenna, and

wherein a plane of the at least one RF choke is substantially parallel to a plane of the dedicated receive antenna.

28. The system of claim 27, wherein the dedicated transmit antenna is configured as a bow-tie monopole antenna, the system further comprising:

at least one RF choke extending substantially perpendicular from the second face surface,

wherein the at least one RF choke is positioned in line with the dedicated transmit antenna,

wherein a plane of the at least one RF choke is substantially parallel to a plane of the dedicated transmit antenna, and

wherein the dedicated transmit antenna and the at least one RF choke on the second face surface are rotated approximately ninety degrees from that of the dedicated receive antenna and the at least one RF choke on the first face surface.

29. The system of claim 19, wherein the at least one layer structure includes at least one high impedance surface for resisting propagation of surface waves.

37. The system of claim 19, wherein the dedicated receive antenna is adapted to have a generally toroidal receiving pattern that is stronger in the first direction that is substantially parallel to the first face surface compared to the second direction that is substantially perpendicular to the first face surface.

44. The system of claim 19, wherein the broadband transceiver does not include the additional elements.

45. The system of claim 19, wherein the additional elements include at least one of a filter, a duplexer, and a circulator.

46. The system of claim 19, wherein the broadband transceiver does not include at least one of a filter, a duplexer, and a circulator.

47. The system of claim 19, further comprising:

a low noise amplifier directly connected to the at least one dedicated receive antenna and configured to amplify analog communication signals received by the at least one dedicated receive antenna prior to transmitting the analog signals to the user device; and

a power amplifier directly connected to the at least one dedicated transmit antenna and configured to amplify analog communication signals received from the user device prior to transmitting the analog signals over the at least one dedicated transmit antenna.

30. A method of performing broadband communications, comprising:

transmitting a downlink RF signal from a dedicated transmit antenna located proximate a first face surface of a broadband transceiver by generating a generally toroidal radiation pattern that is stronger in a first direction that is substantially parallel to the first face surface compared to a second direction that is substantially perpendicular to the first face surface;

receiving an uplink RF signal by a dedicated receive antenna located proximate a second face surface of the broadband transceiver;

isolating the dedicated receive antenna from the downlink RF signal transmitted from the dedicated transmit antenna with a layer structure that is substantially impermeable to RF radiation, the first face surface being located on an opposite side of the layer structure to the second face surface, the isolation necessary for simultaneous transmission and reception of the RF transmissions with a user device;

simultaneously transmitting and receiving, by the broadband transceiver, RF transmissions with the user device without needing additional elements other than the at least one layer structure to provide the isolation between the at least one dedicated receive antenna and the at least one dedicated transmit antenna; and

wherein transmitting RF transmissions occurs via the dedicated transmit antenna, wherein receiving RF transmissions occurs via the dedicated receive antenna.

31. The method of claim 30, further comprising reducing currents flowing from one side of the RF impermeable layer structure to the other side of the RF impermeable layer using an RF choke.

32. The method of claim 30 further comprising mounting the broadband transceiver in a space having a ceiling surface and a floor surface, the RF impermeable layer structure being oriented such that the side with the dedicated receive antenna is spaced from and facing the ceiling surface and the side with the dedicated transmit antenna is spaced from and facing the floor surface.

33. The method of claim 32, wherein the broadband transceiver is configured for being mounted in the space and elevated with respect to the floor surface.

34. The method of claim 30, wherein at least one of the dedicated receive antenna and the dedicated transmit antenna is a broadband monopole antenna.

38. The method of claim 30, wherein receiving the uplink RF signal by the dedicated receive antenna includes receiving by a generally toroidal receiving pattern that is stronger in the first direction that is substantially parallel to the second face surface compared to the second direction that is substantially perpendicular to the second face surface.

39. The method of claim 30, wherein the broadband transceiver is in a remote unit of a distributed antenna system that includes a master unit or a base transceiver station transceiving communication signals with the remote unit that communicates with one or more user devices.

48. The method of claim 30, wherein the additional elements include at least one of a filter, a duplexer, and a circulator.