# US 2019/0319352 A1 · Integrated filtering for band rejection in an antenna element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0319352 A1 - Document ID: US20190319352A1 - Status: Published application - Kind: A1 - Application number: 16/390,929 - Filed: 2019-04-22 - Published: 2019-10-17 - Earliest claimed: 2016-10-20 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Ignacio GONZALEZ; Bruno BISCONTINI; Titos KOKKINOS - Web page: https://patentgrep.com/patent/US20190319352A1 ## CPC - H01Q 1/521: {reducing the coupling between adjacent antennas} - H01Q 1/523: {between antennas of an array} - H01Q 1/246: {specially adapted for base stations} - 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)} - H01Q 5/378: Combination of fed elements with parasitic elements - H01Q 21/26: Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre - H01Q 21/30: Combinations of separate antenna units operating in different wavebands and connected to a common feeder system - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna element is provided. The antenna element comprises: a support structure; a radiating structure arranged on or within the support structure, said radiating structure comprising: a radiating element having a resonant frequency inside an operating frequency band of the antenna element; and a filter connected to the radiating element and configured to filter out harmonics of the operating frequency band. An antenna system is also provided, which comprises a first antenna element according to the first aspect configured to radiate in a first operating frequency band, and a second antenna element configured to radiate in a second operating frequency band, wherein the second operating frequency band overlaps with harmonics of the first operating frequency band. ## Claims ### Claim 1 An antenna element, the antenna element comprising: a support structure; a radiating structure arranged on or within the support structure, the radiating structure comprising: a radiating element having a resonant frequency inside an operating frequency band of the antenna element; and a filter connected to the radiating element and configured to filter out harmonics of the operating frequency band. ### Claim 2 (depends on 1) The antenna element according to claim 1, further comprising a feeding structure configured to feed the radiating element, wherein the filter is arranged within the radiating structure such that the harmonics of the operating frequency band generated in the radiating element are filtered out and the harmonics are isolated from the feeding structure. ### Claim 3 (depends on 1) The antenna element according to claim 1, wherein the filter comprises an electrically conductive pattern comprising at least one transmission line arranged on or in the support structure. ### Claim 4 (depends on 3) The antenna element according to claim 3, wherein dimensions of the at least one transmission line are configured for filtering out at least one harmonic of the operating frequency band. ### Claim 5 (depends on 3) The antenna element according to claim 3, wherein the support structure comprises a conductive layer underneath or above the transmission line, in a stacking direction of the support structure, and wherein the conductive layer comprises at least one non-conductive interruption, which is arranged to make the non-conductive interruption and the transmission line overlap in the stacking direction of the support structure. ### Claim 6 (depends on 5) The antenna element according to claim 5, wherein the non-conductive interruption together with the transmission line are configured to filter out the at least one harmonic of the operating frequency band. ### Claim 7 (depends on 5) The antenna element according to claim 5, wherein the radiating element is a dipole comprising two dipole arms, the filter comprises two filtering units, and the conductive layer comprises two parasitic arms. ### Claim 8 (depends on 7) The antenna element according to claim 7, wherein in the stacking direction of the support structure, each dipole arm of the two dipole arms overlaps with a corresponding parasitic arm of the two parasitic arms. ### Claim 9 (depends on 7) The antenna element according to claim 7, wherein each dipole arm is galvanically connected with a corresponding filtering unit of the two filtering units. ### Claim 10 (depends on 7) The antenna according to claim 7, wherein the two parasitic arms are floating and the two dipole arms are grounded. ### Claim 11 (depends on 1) The antenna element according to claim 1, further comprising at least one electrically closed ring connected to the support structure, wherein the at least one electrically closed ring surrounds the radiating structure and is galvanically isolated from the radiating structure. ### Claim 12 (depends on 1) The antenna element according to claim 1, wherein the support structure comprises a conductive layer, and the filter is formed by the conductive layer and the radiating element, and the radiating element is in a stacking direction of the support structure underneath or above the conductive layer, and the conductive layer is arranged so that the conductive layer and the radiating element overlap in the stacking direction of the support structure. ### Claim 13 (depends on 12) The antenna element according to claim 12, wherein the conductive layer comprises two parasitic arms, the radiating element is a dipole comprising two dipole arms, and the filter comprises two filtering units, wherein each filtering unit of the two filtering units is formed by one parasitic arm of the two parasitic arms and one dipole arm of the two dipole arms. ### Claim 14 (depends on 13) The antenna element according to claim 13, wherein each dipole arm of the two dipole arms and each parasitic arm of the two parasitic arms are grounded. ### Claim 15 (depends on 1) The antenna element according to claim 1, wherein the support structure is a printed circuit board (PCB) or a molded interconnect device (MID). ### Claim 16 (depends on 1) The antenna element according to claim 1, wherein the operating frequency band is between 1.7 GHz and 2.7 GHz. ### Claim 17 An antenna system comprising a first antenna element, configured to radiate in a first operating frequency band, and a second antenna element configured to radiate in a second operating frequency band, wherein the second operating frequency band overlaps with harmonics of the first operating frequency band; and wherein the first antenna element comprises: a support structure; a radiating structure arranged on or within the support structure, the radiating structure comprising: a radiating element having a resonant frequency inside an operating frequency band of the antenna element; and a filter connected to the radiating element and configured to filter out harmonics of the operating frequency band. ### Claim 18 (depends on 1) The antenna element according to claim 1, wherein the antenna element is a base station antenna. ### Claim 19 (depends on 3) The antenna element according to claim 3, wherein the support structure is a stub. ### Claim 20 (depends on 5) The antenna element according to claim 5, wherein the non-conductive interruption is a slot.