Dipole antenna with integrated balun
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 f 1 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.
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 f 1 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 f 1 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 f 2 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 f 2 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.