Broadband antenna

• US 8,570,232 B2
• Filed: 07/02/2009
• Issued: 10/29/2013
• Est. Priority Date: 10/30/2008
• Status: Active Grant

• Current Assignee: Rohde & Schwarz GmbH & Company KG
• Original Assignee: Rohde & Schwarz GmbH & Company KG
• Inventors: Klos, Berthold, Leugner, Dietmar, Nielsen, Ludwig
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US13/001,394
• Publication Number:
  US 20110163928A1
• Time in Patent Office: 1,580 Days
• Field of Search: 343/722, 343/745, 343/749, 343/790, 343/791
• US Class Current: 343/791
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• 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: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

An antenna comprises a monopole and a dipole. The dipole provides a first antenna element and a second antenna element, which provide a common longitudinal axis with the longitudinal axis of a monopole. The first antenna element of the dipole is connected to the second antenna element of the dipole and to the monopole. The monopole bears the dipole. The antenna further contains a decoupling element, which is disposed between the monopole and the dipole.

Claims

1. An antenna comprising:

a monopole comprising at least two antenna elements and a loading element, the loading element configured to implement an impedance matching;

a dipole comprising a first antenna element and a second antenna element, which provide a common longitudinal axis with the longitudinal axis of the monopole; and

a decoupling element disposed between the monopole and the dipole.

2. The antenna according to claim 1, wherein the first antenna element of the dipole is connected to the second antenna element of the dipole and to the monopole and the monopole bears the dipole.

3. The antenna according to claim 1, wherein

the monopole is designed at least partially in a tubular form,

the antenna contains a line,

the line is disposed at least partially within the monopole, and

the line is connected at a connection point to the dipole.

4. The antenna according to claim 3, wherein the decoupling element attenuates sheath waves.

5. The antenna according to claim 3, wherein

the decoupling element contains a plurality of ferrite cores and

the line is guided through at least a part of the ferrite cores.

6. The antenna according to claim 3, wherein

the antenna element of the dipole is designed at least partially in a tubular manner and

the connection point of the line to the dipole is disposed on the outside of the first antenna element.

7. The antenna according to claim 3, wherein

an earth line is connected at a connection point to the inside of the first antenna element of the dipole and

the earth line is connected at a connection point to the inside of the second antenna element of the dipole.

8. The antenna according to claim 7, wherein

a portion of the inside of the first antenna element limited by the connection point of its inside with the earth line and by its end facing towards the second antenna element forms a first inductance connected in parallel to the first antenna element of the dipole,

a portion of the inside of the second antenna element limited by the connection point of its inside with the earth line and by its end facing towards the first antenna element forms a second inductance connected in series to the second antenna element of the dipole,

the first inductance and the second inductance form a transformer, and

the transformer implements an impedance matching.

9. The antenna according to claim 3, wherein

the line tapers in the direction towards its connection point with the dipole and that the tapering achieves an impedance matching.

10. The antenna according to claim 3, wherein

the monopole is disposed on the housing,

the housing contains a filter,

the filter allocates signals of a high-frequency range to the dipole and signals of a low frequency range to the monopole, and

the filter is connected to the line and the monopole.

11. The antenna according to claim 3, wherein

the line is formed at least partially as a strip line on a substrate and

the substrate is disposed at least partially in the interior of the antenna.

12. The antenna according to claim 1, wherein the monopole and the dipole are connected via a diplexer to a common contact point.

13. The antenna according to claim 1, wherein at least one part of the monopole is formed as a fold-over element.

14. The antenna according to claim 1, wherein

the loading element comprises at least one ferrite core,

the line is guided through the ferrite core, and

an outer conductor of the line is connected to the ends of the first and second antenna elements of the monopole facing towards the loading element.