Antenna feed system

• US 8,493,279 B2
• Filed: 06/04/2009
• Issued: 07/23/2013
• Est. Priority Date: 06/04/2009
• Status: Active Grant

• Current Assignee: Ubiquiti Inc.
• Original Assignee: Ubiquiti Networks, Inc. (Ubiquiti Inc.)
• Inventors: Pera, Robert J., Sanford, John R.
• Primary Examiner(s): Wimer, Michael C
• Assistant Examiner(s): PATEL, AMAL A
• Application Number:
  US12/477,986
• Publication Number:
  US 20100309085A1
• Time in Patent Office: 1,510 Days
• Field of Search: 343/840, 343/833, 343/834, 343/779, 343/786, 343/757, 343/761, 343/754, 343/758, 343/795, 343/837, 343/781.P, 343/781.R, 343/781.CA, 455/90.3
• US Class Current: 343/840
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H01Q 19/191 wherein the primary active element uses one or more deflecting surfaces, e.g. beam waveguide feeds
• CPC Class Codes: H01Q 19/193 with feed supported subreflector splash plate feeds H01Q19/134
• CPC Class Codes: H01Q 19/28 using a secondary device in the form of two or more substantially straight conductive elements log- periodic antennas H01Q11/10; constituting a reflecting surface H01Q19/10
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

A microwave system comprises an antenna, antenna feed, a radio transceiver, and appropriate cabling among the aforementioned. Cost, performance and reliability improvements are achieved with further integration of these elements and with design improvements in the antenna feed. One improvement is the integration of the radio transceiver with the antenna feed. This improvement has many benefits including the to elimination of RF cables and connectors. Another improvement is the incorporation of parasitic radiators and sub-reflectors as part to of the antenna feed. The entire antenna, including the feed design is optimized with 3D finite element method (FEM) software and numerical optimization software. Another improvement is the utilization of the digital cable to power the integrated radio transceiver and a center fed parabolic reflector.

Claims

1. A device comprising:

a center fed substantially parabolic reflector;

a circuit board;

at least one substantially cylindrical feed pin radially disposed on said circuit board, said feed pin extending substantially perpendicular to the plane of the circuit board;

at least one substantially cylindrical director disposed radially on said circuit board, said director positioned a first distance and along a first direction from said feed pin, said director extending substantially perpendicular to the plane of the circuit board;

a radio transceiver disposed on the circuit board along the first direction, said radio transceiver coupled to the feed pin though a trace on the circuit board;

at least one sub-reflector disposed opposite the first direction at a second distance from the feed pin, said sub-reflector forming a substantially concave surface focused towards the first direction

wherein the circuit board is physically integrated within a feed mechanism of the center fed parabolic reflector.

2. The device of claim 1 further including a second feed pin disposed on the opposite side of the circuit board, said second feed pin extending substantially perpendicular to the plane of the circuit board.

3. The device of claim 1 wherein the at least one director is disposed through the circuit board, having a portion extending on two sides of the circuit board.

4. The device of claim 1 wherein the sub-reflector is disposed in a weather-proof housing.

5. The device of claim 4 wherein the weather-proof housing supports interchangeable sub-reflectors.

6. The device of claim 1

wherein the feed pin, the director and the sub-reflector are disposed to focus electromagnetic radiation to the center-fed parabolic reflector.

7. The device of claim 6 wherein the center-fed parabolic reflector is a grid reflector.

8. The device of claim 6 wherein the center-fed parabolic reflector is disposed along the first direction.

9. The device of claim 1 further including:

a connector, said connector operable to provide a digital signal to the transceiver, wherein the transceiver is configured to generate electromagnetic radiation in response to said digital signal, said electromagnetic radiation representative of information contain in the digital signal.

10. The device of claim 1 wherein the electromagnetic energy is in the microwave frequency spectrum.