Radiating element and base station antenna
The present disclosure relates to a radiating element, which includes: a dipole arm configured to emit first electromagnetic radiation within a pre-determined first operating frequency band; and a parasitic radiator, configured such that a first induced current induced on the parasitic radiator within a second operating frequency band at least partially cancels a second induced current induced on the dipole arm within the second operating frequency band. In addition, the present disclosure relates to a base station antenna, including: a first radiating element array, configured to emit first electromagnetic radiation within a pre-determined first operating frequency band, and at least a part of first radiating elements in the first radiating element array is constructed as radiating elements according to the present disclosure; a second radiating element array, configured to emit second electromagnetic radiation within a pre-determined second operating frequency band.
1 . A base station antenna, comprising:
a first array of first radiating elements, the first array configured to operate in a first frequency range; and
a second array of second radiating elements, the second array configured to operate in a second frequency range that is different than the first frequency range and that does not encompass any of the same frequencies as the first frequency range,
wherein at least some of the first radiating elements comprise:
a dipole arm; and
a parasitic radiator that overlaps the dipole arm when the base station antenna is viewed from the front, the parasitic radiator configured such that a first induced current induced on the parasitic radiator within the second frequency range at least partially cancels a second induced current induced on the dipole arm within the second frequency range, wherein a resonant frequency of the parasitic radiator is within the second frequency range.
2 . The base station antenna of claim 1 , wherein the first induced current induced on the parasitic radiator completely cancels the second induced current induced on the dipole arm.
3 . The base station antenna of claim 1 , wherein the first induced current is in opposite phase with the second induced current.
4 . The base station antenna of claim 1 , wherein the first frequency range includes at least a part of the 617 to 960 MHz frequency band and the second frequency range includes at least a part of the 1,427 to 2,690 MHz frequency range.
5 . The base station antenna of claim 1 , wherein the parasitic radiator is configured such that a third induced current induced on the parasitic radiator within the first frequency range is in phase with the operating current on the dipole arm within the first frequency range.
6 . The base station antenna of claim 1 , wherein the dipole arm includes a choke, which is configured to inhibit the second induced current induced on the dipole arm.
7 . The base station antenna of claim 6 , wherein the choke is constructed to allow current on the dipole arm within the first frequency range to pass through, while stopping the second induced current induced on the dipole arm.
8 . The base station antenna of claim 6 , wherein at least one of the first radiating elements further comprises a second dipole arm, and wherein each dipole arm has one choke.
9 . The base station antenna of claim 1 , wherein at least one of the first radiating elements further comprises a second dipole arm, and wherein neither the first dipole arm nor the second dipole arm has a choke.
10 . The base station antenna of claim 1 , wherein the parasitic radiator is configured to have electromagnetic effects with the dipole arm, such that scattered electromagnetic radiation generated by a first of the first radiating elements within the second frequency range is attenuated by at least 13 dB.
11 . The base station antenna of claim 10 , wherein the scattered electromagnetic radiation generated by the first of the first radiating elements within the second frequency range is attenuated by at least 16 dB.
12 . The base station antenna of claim 1 , wherein the parasitic radiator is adjacent the dipole arm.
13 . The base station antenna of claim 1 , wherein the parasitic radiator is constructed as a parasitic metal ring.
14 . The base station antenna of claim 1 , wherein the parasitic radiator is constructed as a parasitic metal section.
15 . The base station antenna of claim 1 , wherein a cloaking performance of the at least some of the first radiating elements to electromagnetic radiation within the second operating frequency band is related to a distance of the parasitic radiator relative to the dipole arm and size parameters of the parasitic radiator.
16 . A base station antenna, comprising:
a first array of first radiating elements, the first array configured to operate in at least a portion of the 617-960 MHz frequency band; and
a second array of second radiating elements, the second array configured to operate in at least a portion of the 1427-2690 MHz frequency band,
wherein at least one of the first radiating elements comprises:
a dipole arm; and
a parasitic radiator configured such that a first induced current induced on the parasitic radiator within the 1427-2690 MHz frequency band at least partially cancels a second induced current induced on the dipole arm within the 1427-2690 MHz frequency band, wherein a resonant frequency of the parasitic radiator is within the 1427-2690 MHz frequency band.
17 . The base station antenna of claim 16 , wherein the parasitic radiator overlaps the dipole arm when the base station antenna is viewed from the front.