Dipole shaped radiator arrangement

• US 7,999,752 B2
• Filed: 08/02/2007
• Issued: 08/16/2011
• Est. Priority Date: 08/22/2006
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Kathrein-Werke KG. (Kathrein SE)
• Inventors: Riedel, Matthias
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US12/438,247
• Publication Number:
  US 20100007571A1
• Time in Patent Office: 1,475 Days
• Field of Search: 343/795, 343/797
• US Class Current: 343/797
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/26 Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre

Abstract

An improved dipole-shaped radiator arrangement is characterized by the following features: a base is disconnected from ground or a ground surface with respect to direct current, or is capacitively coupled to a ground surface; a first dipole or radiator half is electro-galvanically or capacitively fed by a conductor; a second dipole or radiator half is fed via a further feed line in the form of an inner conductor feed; the one end of the first inner conductor section is electrically connected to a matching network; the other end of the third inner conductor section is connected to ground or to the ground surface with respect to direct current.

Claims

1. Dipole-shaped radiator arrangement comprising:

at least two dipole or radiator halves for each of the two dipole or radiator halves, an associated support means comprising first and second support halves,

an axial hole is formed in each support half,

the at least two support halves are connected by a base,

in each case a first dipole or radiator half, the associated support halves and the base connecting the two support halves is composed of an electrically conductive material or is coated with an electrically conductive material,

the base is isolated with respect to direct current from ground or a ground surface or is capacitively coupled to a ground surface,

the first dipole or radiator half is electrogalvanically or capacitively fed by a conductor,

a second dipole or radiator half is fed by a feed line in the form of an inner conductor feed means,

the inner conductor feed means comprises an inner conductor with a first inner conductor portion which extends in the first support half, a second inner conductor portion which extends in an axial hole in the second support half, the first inner conductor portion, which extends in the first support half, and the second inner conductor portion, which extends in the second support half, being electrically connected by a central inner conductor portion,

one end of the first inner conductor portion is electrically connected to a matching network,

the other end of the second inner conductor portion is DC connected to the ground surface or a reflector,

a printed circuit board provided on the rear or lower side of the ground surface or the reflector,

a hole, through which a continuation of the second inner conductor portion is guided, provided in the ground surface or the reflector and in the printed circuit board, and

the end of the second inner conductor portion which is guided through the hole is connected to the ground surface or the reflector via an electrical connection.

2. Radiator arrangement as claimed in claim 1, characterized by the following further features:

the central inner conductor portion lies, relative to the ground surface or the reflector, at least over part of the length of the radiator plane or at least at a point in the height of the radiator plane, which is formed by the dipole or radiator halves or in a height range between not more than λ

/10 below this radiator plane and not more than λ

/6 above this radiator plane, λ

representing a wavelength of the frequency band to be transmitted, preferably the average wavelength.

3. Radiator arrangement as claimed in claim 2, wherein the central inner conductor portion is arranged relative to the ground surface or the reflector at a height above the plane formed by the dipole or radiator halves, and more specifically not more than λ

/10 above this plane, λ

representing a wavelength of the frequency band to be transmitted, preferably the average wavelength.

4. Radiator arrangement as claimed in claim 1, wherein the distance between the dipole or radiator halves, and the ground surface or the reflector is more than λ

/10 or more than λ

/4, being a wavelength of the frequency band to be transmitted, preferably the average wavelength.

5. Radiator arrangement as claimed in claim 1, wherein a dual-polarized radiator arrangement with two support means which are offset by 90°

relative to one another comprises two support halves for each polarization plane (P) with an associated inner conductor feed means, the central inner conductor portions of the two inner conductor feed means crossing in a galvanically isolated manner.

6. Radiator arrangement as claimed in claim 1, wherein the inner conductor portions which are guided in the respective support halves are isolated from the support means by an insulator.

7. Radiator arrangement as claimed in claim 6, wherein an insulating sleeve, in the interior of which the associated inner conductor portion is guided and held, is provided in the axial holes in the support halves.

8. Radiator arrangement as claimed in claim 1, wherein the end of the second inner conductor portion, which is guided through the hole, is connected to the ground surface or the reflector via feedthroughs.

9. Radiator arrangement as claimed in claim 1, wherein the radiator arrangement is held at least indirectly to the printed circuit board provided with the ground surface by said inner conductor which is arranged so as to be at least approximately U-shaped when viewed from the side.

10. Radiator arrangement as claimed in claim 1, wherein said matching network is provided on the side, which is remote from the dipole or radiator halves, of the printed circuit board supporting the ground surface.

11. Radiator arrangement as claimed in claim 10, wherein said hole, through which said continuation of the inner conductor portion extends to the matching network, is provided in the ground surface, the reflector or the printed circuit board.

12. Radiator arrangement as claimed in claim 1, wherein said two dipole or radiator halves are fed via a coaxial cable, the inner conductor of which for feeding one of the dipole or radiator halves forms the inner conductor or is connected thereto, and the outer conductor of which for feeding the other dipole or radiator half is preferably connected to the dipole or radiator half preferably in an electrogalvanic manner via the associated support half or preferably via a capacitive coupling.

13. Radiator arrangement as claimed in claim 1, wherein the inner conductor portions of the inner conductor have the same diameter.