Single piece element for a dual polarized antenna

• US 20020163476A1
• Filed: 05/03/2001
• Published: 11/07/2002
• Est. Priority Date: 05/03/2001
• Status: Active Grant

• Current Assignee: Amphenol Corporation
• Original Assignee: Radiovector U.S.A., LLC
• Inventors: Eriksson, Stefan G.
• Granted Patent: US 6,597,324 B2
• Time in Patent Office: Days
• US Class Current: 343/815
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

An antenna system comprising a plurality of dipole elements formed from a single piece of material. The plurality of dipole elements is attached to a reflector plate with a single supporting base and forms horizontally or vertically stacked radiation elements. Tabs located between the center of the single piece and legs of the dipole elements and are bent at an angle to form a symmetrical axis in the center of slots separating the plurality of dipole elements to attenuate the radiation caused by current flowing around the slots. The plurality of dipole elements are selected to achieve different radiation patterns and can be formed into different shapes to achieve different lobe shapes.

Claims

1. A dual polarized antenna system having an electrically conductive reflector plate comprising:

at least one multiple dipole element having a top surface and a bottom surface, the multiple dipole element formed from a single piece of electrically conductive material forming a plurality of half-wave dipole elements separated by slots, the multiple dipole element having at least two legs separated by one of the slots and at least one arm integrally attached to each leg at a position substantially normal to the leg.;

a base attached to the multiple dipole element and attached to the reflector plate; and

a plurality of feed lines connected to the multiple dipole element, a first feed line of the plurality of feed lines is placed above the top surface and a second feed line of the plurality of feed lines is placed below the bottom surface at a position normal to the first feed line.

2. The antenna system of claim 1 wherein the reflector plate has a length and a width, the base is attached to the reflector plate such that one of the first feed line and second feed line is located along a first axis, the first axis being in parallel with a second axis located along the length thereby forming a i ninety degree polarized antenna system.

3. The antenna system of claim 1 wherein the reflector plate has a length and a width, the base is attached to the reflector plate such that one of the first feed line and second feed line is located along a first axis, the first axis being at a forty five degree angle relative to a second axis located along the length thereby forming a ±

forty five degree polarized antenna system.

4. The antenna system of claim 1 further having at least one tab integral with a leg and located between an arm and a groove, the groove located at a junction between adjacent legs.

5. The antenna system of claim 4 wherein the tab is located at a predefined angle selected from one of forty-five degrees and ninety degrees.

6. The antenna system of claim 1 wherein the antenna system has a plurality of multiple dipole elements and bases and further comprises an isolation element attached to the reflector plate and located between the bases, the horizontal feed line portions of the feed lines connected to the first feed elements are routed above the reflector plate on a first side of the isolation element and the horizontal feed line portions of the feed lines connected to the second feed elements are routed on a second side of the isolation element.

7. A dual polarized antenna system having an electrically conductive reflector plate comprising:

at least one multiple dipole element having a top surface and a bottom surface, the multiple dipole element formed from a single piece of electrically conductive material forming a plurality of half-wave dipole elements separated by slots, the multiple dipole element comprising;

at least two legs separated by one of the slots;

at least one arm integrally attached to each leg at a position substantially normal to the leg;

at least one notch integrally attached to at least one of the arms;

a base having at least one feeder line channel, the base attached to the multiple dipole element and attached to the reflector plate;

a plurality of feed elements connected to the multiple dipole element, a first feed element of the plurality of feed elements is placed above the top surface and a second feed element of the plurality of feed elements is placed below the bottom surface at a position substantially normal to the first feed element; and

a plurality of feed lines, each feed line having a vertical feed line portion connected to one of the feed elements and a horizontal feed line portion connected to at least one connector, each vertical feed line portion located in one of the feeder line channels and each horizontal feed line portion located above the reflector plate.

8. The antenna system of claim 7 wherein the reflector plate has a length and a width, the base is attached to the reflector plate such that one of the first feed element and second feed element is located along a first axis, the first axis being in parallel with a second axis located along the length thereby forming a i ninety degree polarized antenna system.

9. The antenna system of claim 8 wherein the reflector plate has a length and a width, the base is attached to the reflector plate such that one of the first feed element and second feed element is located along a first axis, the first axis being at a forty five degree angle relative to a second axis located along the length thereby forming a ±

forty five degree polarized antenna system.

10. The antenna system of claim 7 wherein each horizontal feed line portion has an impedance from the connector to a multiple dipole element and each horizontal feed line portion is routed so that the impedance of a first horizontal feed line portion is approximately matched to the impedance of a second horizontal feed line portion at a desired frequency range.

11. The antenna system of claim 7 wherein the multiple dipole element is located in a first elevation, the antenna system further comprising at least one strip attached to the reflector plate, the strip attached to the reflector plate at a location such that the strip is at an approximately ninety degree angle from one of the arms at a predefined distance from one of the arms at a second elevation and centered on an axis of the slot.

12. The antenna system of claim 11 wherein a plurality of strips form a symmetrical axis around the center of a pair of multiple dipole elements.

13. The antenna system of claim 7 wherein the multiple dipole element further comprises at least one tab integral to one of the legs and located between an arm and a groove, the groove located at a junction between adjacent legs.

14. The antenna system of claim 7 wherein the antenna system has a plurality of multiple dipole elements and bases and further comprises an isolation element attached to the reflector plate and located between the bases.

15. The antenna system of claim 14 wherein the horizontal feed line portions of the feed lines connected to the first feed elements are routed above the reflector plate on a first side of the isolation element and the horizontal feed line portions of the feed lines connected to the second feed elements are routed on a second side of the isolation element.

17. The multiple dipole element of claim 16 further comprising at least one notch integrally attached to one of the arms.

18. The multiple dipole element of claim 17 wherein the multiple dipole element has a plurality of arms and half of the plurality of arms have notches.

19. The multiple dipole element of claim 18 wherein the arms having notches are symmetrically located about a center of the multiple dipole element.

20. The multiple dipole element of claim 16 wherein the tab is substantially normal to the plurality of legs.

16. A multiple dipole element having a top surface and a bottom surface formed from a single piece of electrically conductive material comprising:

a plurality of legs, the legs separated by slots and grooves, each leg substantially parallel to at least one other leg and approximately normal to an adjacent leg;

at least one arm integrally attached to at least one of the legs at a position substantially normal to the leg;

at least one tab located along one of the legs between one of the arms and an adjacent leg.