Radiating element for multi-band antenna and multi-band antenna
A first band radiating element for a multi-band antenna comprises at least one first band dipole that has a first dipole arm and a second dipole arm that each include one or more arm segments, and the number of the arm segments of the first dipole arm is greater than the number of the arm segments of the second dipole arm.
1. A first band radiating element for a multi-band antenna, comprising:
at least one first band dipole that has a first dipole arm and a second dipole arm,
wherein each of the first and second dipole arms includes one or more arm segments, and
wherein a number of arm segments included in the first dipole arm is greater than a number of the arm segments included in the second dipole arm.
2. The first band radiating element according to claim 1 , wherein the multi-band antenna further includes a plurality of second band radiating elements that are configured to operate in a different frequency band than the first band radiating element.
3. The first band radiating element according to claim 2 , wherein a minimum distance between the second dipole arm and any of the second band radiating elements is greater than a minimum distance between the first dipole arm and any of the second band radiating elements.
4. The first band radiating element according to claim 3 , wherein at least one of the second band radiating elements is disposed in a vicinity of a region underneath the first dipole arm and the second band radiating elements are remote from a region underneath the second dipole arm.
5. The first band radiating element according to claim 1 , wherein the first dipole arm is positioned opposite the second dipole arm at an angle of 180 degrees.
6. The first band radiating element according to claim 1 , wherein the first dipole arm and the second dipole arm each include a central conductor and a plurality of arm segments arranged around the central conductor, wherein the plurality of arm segments are spaced apart from each other along the central conductor.
7. The first band radiating element according to claim 6 , wherein at least some of the arm segments comprise a hollow electrical conductor that is connected at one end to the central conductor and disconnected at another end from the central conductor.
8. The first band radiating element according to claim 7 , wherein a plurality of protrusions are disposed axially on the central conductor from one end of the central conductor and spaced apart from each other, thereby dividing the central conductor into a plurality of electrically conducting segments, the hollow electrical conductor and the central conductor being connected on the protrusions.
9. The first band radiating element according to claim 8 , wherein in the second dipole arm, at least two adjacent protrusions are electrically connected through said hollow electrical conductor.
10. The first band radiating element according to claim 9 , wherein the hollow electrical conductor which connects the at least two adjacent protrusions is disposed in an end region or a middle region of the second dipole arm.
11. The first band radiating element according to claim 9 , wherein an electrically conducting segment of the plurality of electrically conducting segments between the at least two adjacent protrusions is omitted.
12. The first band radiating element according to claim 7 , wherein the hollow electrical conductor is a hollow cylindrical structure.
13. The first band radiating element according to claim 7 , wherein gaps are present between the hollow electrical conductor and the central conductor.
14. The first band radiating element according to claim 13 , wherein the gaps are filled with air, or the gaps are at least partially filled with dielectric material.
15. The first band radiating element according to claim 2 , wherein the first band radiating element is a low-band radiating element and a second band radiating element of the plurality of second band radiating elements is a high-band radiating element.
16. The first band radiating element according to claim 1 , wherein the first dipole arm and the second dipole arm are constructed on a common printed circuit board.
17. The first band radiating element according to claim 16 , wherein the first dipole arm and the second dipole arm each includes has a plurality of spaced-apart arm segments, with adjacent arm segments being connected via respective filters.
18. The first band radiating element according to claim 17 , wherein each filter comprises an inductive element or a combination of the inductive element and a capacitive element.
19. The first band radiating element according to claim 18 , wherein each filter exhibits a high impedance characteristic in a second band and a low impedance characteristic in a first band.
20. A multi-band antenna, wherein the multi-band antenna comprises the first band radiating element and a second band radiating element of the plurality of second band radiating elements according to claim 2 , and the first band is different from the second band.