Dipole antenna with integrated balun

• US 9,837,722 B2
• Filed: 06/09/2016
• Issued: 12/05/2017
• Est. Priority Date: 06/09/2015
• Status: Expired due to Fees

• Current Assignee: Magnolia Licensing LLC (IP Edge LLC)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Minard, Philippe, Rambault, Claude, Lo Hine Tong, Dominique, Aubin, Anthony
• Primary Examiner(s): Phan, Tho G
• Application Number:
  US15/178,516
• Publication Number:
  US 20160365640A1
• Time in Patent Office: 544 Days
• 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 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/24 Shunt feed arrangements to single active elements, e.g. for delta matching
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

The invention relates to a dipole antenna including first and second radiating elements electrically connected via a transition, said first and second elements being associated with a frequency f₁ in a frequency band, a feeding point the feeding point and the reference point being respectively connected to a feeding conductor and a ground conductor of a feeding line, and a balun. The balun is formed by a slot arranged in the first radiating element, said slot having a short circuit at a first end and an open circuit at a second end next to the transition. The feeding point and the reference point are arranged on opposite sides of the slot.

Claims

1. A dipole antenna comprising:

at least a first radiating element and a second radiating element electrically connected via a transition,

a feeding point on the first radiating element and a reference point, the feeding point being connected to a feeding conductor of a feeding line and the reference point being connected to a ground conductor of said feeding line, and

a balun,

wherein

the balun comprises at least a first slot arranged within the first radiating element, said first slot having a short circuit at a first end and an open circuit at a second end next to the transition, and

the feeding point and the reference point are arranged on opposite sides of said first slot.

2. The dipole antenna according to claim 1, wherein the reference point is arranged on the side of the slot comprising the transition.

3. The dipole antenna according to claim 1, wherein the length of the first slot is substantially equal to λ

₁/4, where λ

₁ is a guided wavelength of a first frequency f₁ associated with the first and second radiating elements.

4. The dipole antenna according to claim 3, wherein the reference point is present at the transition.

5. The dipole antenna according to claim 3, wherein the first frequency band is the frequency band [5.15 GHz, 5.85 GHz] and the frequency f₁ is one frequency within the frequency band [5.15 GHz, 5.85 GHz].

6. The dipole antenna according to claim 1, wherein the feeding line belongs to the following group:

a coaxial cable,

a microstrip or strip line,

a coplanar waveguide line,

a slot line.

7. The dipole antenna according to claim 1, wherein the general shape of the first and second radiating elements is ellipsoidal or rectangular or triangular or trapezoidal or polygonal.

8. The dipole antenna according to claim 1, wherein the balun further comprises at least one second slot, said at least one second slot opening in the first slot.

9. The dipole antenna according to claim 8, wherein the length of said at least one second slot is substantially equal to the length of the first slot.

10. The dipole antenna according to claim 1, further comprising a third radiating element electrically connected to the first radiating element and a fourth radiating element electrically connected to the second radiating element, said third and fourth radiating elements being associated with a second frequency f₂ in a second frequency band of the antenna.

11. The dipole antenna according to claim 10, wherein the second frequency band is the frequency band [2.4 GHz, 2.5 GHz] and the frequency f₂ is one frequency within the frequency band [2.4 GHz, 2.5 GHz].

12. The dipole antenna according to claim 1, comprising a single or multilayer substrate (13,113) wherein the first and second radiating elements and, if applicable, the third and fourth radiating elements are arranged on said substrate.

13. The dipole antenna according to claim 1, wherein the dipole antenna is realized in a stamped metal technology.

14. An electronic wireless device comprising at least one dipole antenna according to claim 1.

15. An electronic wireless device according to claim 14 comprising a gateway device or a set top box device.