Antenna arrangement with resonance element

Abstract

The invention refers to an antenna arrangement (10), comprising a first radiator (1), wherein the first radiator is configured to transmit radio signals of a first frequency band; and a second radiator (2), wherein the second radiator (2) is configured to transmit radio signals of a second frequency band, the second frequency band being different from the first frequency band; wherein the second radiator (2) comprises a resonance element (3), wherein the resonance frequency is a frequency of the first frequency band, wherein the resonance frequency is outside of the second frequency band; and wherein the resonance element (3) is configured to be excited by the transmitted radio signals of the first radiator (1).

Description

[0001] Antenna arrangement with resonance element

[0002] Technical field

[0003] The invention refers to the technical field of antenna arrangements, in particular to antenna arrangements in base station antennas.

[0004] Background

[0005] In the design of base station antennas, it is desirable to shrink a size of the base station antenna to reduce costs for clients, costs in production and a CO2 footprint of the antenna. With that, technical difficulties arise. A reduced antenna size reduces the space between radiators and lead to higher mutual coupling and therefore worse results in various antenna parameters. One critical parameter is the horizontal half power beam width (H-HPBW). This parameter describes an arc in which the power of the radiated beam is reduced by 3dB.

[0006] The mutual coupling can be improved by metal walls surrounding the radiator or decoupling elements in the space between the neighbouring radiators. These elements can influence the radiator in a negative way and are always placed near the radiator, leading to an even higher degradation of the radiator performance. Decoupling elements are often floating in the antenna and therefor have only limited effect on the mutual coupling due to the design limitations of having no GND to work with.

[0007] Having a different way to change the behaviour of the mutual coupled signal could save material and additional elements in the antenna.

[0008] An antenna arrangement according to the invention comprises a first radiator, wherein the first radiator is configured to transmit radio signals of a first frequency band, a second radiator, wherein the second radiator is configured to transmit radio signals of a second frequency band, the second frequency band being different from the first frequency band. The second radiator comprises a resonance element, wherein the resonance element is configured to resonate in a resonance frequency, wherein the resonance frequency is outside of the second frequency band. The resonance element is configured to be excited by the transmitted radio signals of the first radiator.

[0009] 1

[0010] P11 1661 A method for transmitting a radio signal by an antenna arrangement according to the invention comprises transmitting radio signals of a first frequency band by a first radiator, transmitting radio signals of a second frequency band by a second radiator, the second frequency band being different from the first frequency band, and exciting a resonance element by the transmitted radio signals of the first radiator to resonate in a resonance frequency, wherein the resonance frequency is outside of the second frequency band.

[0011] The first radiator is an antenna component that is typically supplied over a feeding network of an antenna. In particular, the first radiator is configured to receive radio signals of the first frequency band. The first frequency band can be a high-band, a low-band or a mid-band of a communications network, for example a 3G, 4G, 5G or 6G network. The second frequency band can be another one of the high-band, the low-band or a mid-band of the communications network. The first frequency band and the second frequency band can be overlapping frequency bands. The second radiator is an antenna component that is typically supplied over a feeding network of an antenna. In particular, the second radiator is configured to receive radio signals of the second frequency band.

[0012] The second radiator comprises the resonance element. The resonance element is preferably not directly connected to a feeding network of the antenna, which means that there is no wired supply line that is configured to supply the resonance element for exciting the resonance element to resonate in the resonance frequency. It is noted that there is optionally a conductive connection in between the elements of the second radiator that are emitting the radio signals of a second frequency band, which means that the resonance element is connected to the feeding network of the antenna via the second radiator. However, this connection is not a direct connection to the feeding network and is not configured to supply the resonance element for exciting the resonance element to resonate in the resonance frequency.

[0013] In particular, the resonance element is configured to transmit radio signals of the first frequency band in reaction to being excited by the transmitted radio signals of the first radiator.

[0014] The resonance frequency can be a frequency of the first frequency band or can be a frequency outside of the first frequency band. In case that the resonance frequency is outside of the first frequency band, this typically leads to an additional phase shift in the transmitted radio signal, before it is re- transmitted by the excited resonance element. It is noted that this effect can be used for adjusting a phase shift such that a beamwidth of the first radiator or an array that comprises the first radiator can be adjusted.

[0015] 2

[0016] P11 1661 By combining the second radiator with the resonance element, an additional source of the radio signal of a first frequency band is provided, without any active components. That is, yy exciting the resonance element by the transmitted radio signals of the first radiator to resonate in a resonance frequency, the radio signal of the first radiator is re- transmitted by the resonance element. By defining the distance between the first radiator and the resonance element, an impact on a beamform of a beam of the antenna arrangement in the first frequency band can be achieved. In particular, a beamwidth or H-HPBW can be reduced.

[0017] A mutual coupling between radiators can be improved by metal walls surrounding the radiator or decoupling elements in the space between the neighbouring radiators. These elements can influence the radiator in a negative way and are always placed near the radiator, leading to an even higher degradation of the radiator performance. Decoupling elements are often floating in the antenna and therefor have only limited effect on the mutual coupling due to the design limitations of having no GND to work with. Having a different way to change the behaviour of the mutual coupled signal could save material and additional elements in the antenna. This could lead to an overall better antenna performance.

[0018] By means of the resonance element, a filter can be placed in a neighbouring radiator to alter the signal from the mutual coupling. This leads to a controlled re-radiation and therefor an improvement of the pattern H-HPBW and better isolation. This is only possible if the radiators have different working frequency bands.

[0019] The resonance element is placed in a radiator head to improve the performance of the neighbour. This leads to the advantage of an improved isolation and horizontal HPBW in the frequency band that is not shared between the involved radiators.

[0020] An antenna arrangement according to the invention is configured to perform the method according to the invention.

[0021] The dependent claims define advantageous embodiments of the invention.

[0022] In particular, the resonance frequency is a frequency of the first frequency band. This allows to minimize losses when exciting the resonance element.

[0023] In particular, the resonance element is a LC-circuit. The LC circuit comprises an inductive component, that is the L-Element, and a capacitive component, that is the C-Element. Inductive and capacitive components are often used in radiator elements. For example, capacitive components are often used for extending a bandwidth of a radiator. Designing the resonance element 3

[0024] P11 1661 as a LC-circuit allows to re-use existing inductive components or existing capacitive components.

[0025] In particular, the second radiator comprises a first radiator element and a second radiator element, wherein the resonance element is a portion of the first radiator element or the second radiator element. That is, the resonance element is integrated into the second radiator. In particular, the resonance element is part of a radio head of the second radiator. This allows a space and cost-effective integration of the resonance element.

[0026] In particular, the first radiator element comprises a loop-element and / or the second radiator element comprises a loop-element. The loop-element is a conductive loop, wherein the loop can comprise gaps. The loop-element is optionally forming a loop-antenna. The loop-element can be a metal sheet that is shaped to form a loop.

[0027] In particular, the resonance element is at least partially aligned at an inner side of the loop-element. Thus, a distance between the first radiator and the second radiator can be minimized, while maintaining a required minimum distance between the resonance element and the first radiator.

[0028] In particular, the resonance element comprises a capacitive component, which is formed by a gap in the loop-element, and an inductive component, which is formed by a connection-loop, wherein the connection loop is connecting different sides of the loop-element that are separated by the gap. The inductive component is preferably an inductor, in particular a coil with one or more windings. The capacitive component is preferably a capacitor that is formed by the gap in the loop-element.

[0029] In particular, the second radiator comprises a further resonance element, wherein the further resonance element is configured to resonate in the resonance frequency, wherein the further resonance element is configured to be excited by the transmitted radio signals of the first radiator. The resonance element and the further resonance element are preferably aligned on opposing sides of the second radiator. A further adjustment of the beam width or H-HPBW can be achieved by the further resonance element.

[0030] In particular, the resonance element is configured to act as a filter, wherein the filter is configured to filter a frequency of the second frequency band, wherein the frequency of the second frequency band is different from the resonance frequency. This allows an adjustment of the antenna characteristics of the second radiator.

[0031] 4

[0032] P11 1661 In particular, the first radiator and the second radiator are both mounted above a common reflector. This allows, that the reflector is also reflecting the radio signals of a first frequency band that is emitted by the resonance element.

[0033] In particular, the first radiator and the second radiator are neighbouring radiators. That is, there is no further radiator in between the first radiator and the second radiator. This ensures that the radio signal that is emitted by the first radiator and that is intended to excite the resonance element is not absorbed by any intermediate element. The first radiator and the second radiator are neighbouring radiators are in particular neighbouring radiators without covering each other in a transmission direction. In other words, first radiator and the second radiator are neighbouring radiators, wherein the first radiator and the second radiator are both configured to transmit a beam in a transmission direction, wherein the second radiator is not covering the first radiator in the transmission direction.

[0034] In particular, a distance between the first radiator and the resonance element is a multiple of half of a wavelength of the radio signals of the first frequency band. This allows a superposition of the radio waves of the radio signal that is emitted by the first radiator and the radio waves of the radio signal that is emitted by the resonance element, which is excited by the radio signal that is emitted by the first radiator. In this case, it is possible that no further phase adjustments are required, for example by adapting the resonance frequency.

[0035] In particular, the first radiator is an antenna of a first antenna array and the second radiator is an antenna of a second antenna array.

[0036] In particular, each radiator of the second antenna array comprises a corresponding resonance element that is configured to resonate in a frequency of the first frequency band.

[0037] An antenna that comprises the antenna arrangement according to invention is suitable to achieve all advantages of the antenna arrangement.

[0038] 5

[0039] P11 1661 Brief description of the drawings

[0040] Fig. 1 shows an antenna arrangement according to embodiments of the invention;

[0041] fig. 2 shows an illustration of a signal path of a radio signal that is emitted by a first radiator;

[0042] fig. 3 shows an illustration signal paths of a radio signal that is emitted by a first radiator via two resonance elements;

[0043] fig. 4 shows an antenna arrangement according to embodiments of the invention;

[0044] fig. 5 shows an exemplary second radiator according to embodiments of the invention;

[0045] fig. 6a shows an exemplary antenna arrangement in a antenna according to embodiments of the invention;

[0046] fig. 6b shows measurement results for different radiator types that were used in the exemplary antenna arrangement of fig. 6a; and

[0047] fig. 7 shows a flow-chart of a method according to the invention.

[0048] Detailed description

[0049] Figure 1 shows an antenna arrangement 10 according to aspects of the invention. The antenna arrangement 10 comprises a first radiator 1 and a second radiator 2. The first radiator 1 and the second radiator 2 are radiators of a base station of a mobile communication network, for example of a mobile communication networks according to a 3GPP standard like 4G, 5G or 6G.

[0050] The first radiator 1 is configured to transmit radio signals of a first frequency band. For example, the first frequency band is a lower midband, for example from 1.427 to 2.690 GHz. The second radiator 2 is configured to transmit radio signals of a second frequency band. For example, the second frequency band is a midband, for example from 1.690 to 2.690 GHz. The second frequency band is different from the first frequency band. However, as shown by the examples, the first frequency band and the second frequency band can be overlapping frequency bands.

[0051] 6

[0052] P111661 The first radiator 1 and the second radiator 2 are both mounted above a common reflector 4. The first radiator 1 and the second radiator 2 are neighbouring radiators, that is, there is no further radiator in between the first radiator 1 and the second radiator 2. It is noted that a further radiator, which is preferably configured to transmit radio signals of a third frequency band, the third frequency band being different from the first frequency band and the second frequency band, might be aligned in front of or behind the first radiator 1 and / or the second radiator 2 when seen from a perspective of the reflector 4.

[0053] The second radiator 2 comprises a resonance element 3. The resonance element 3 is a constructive element that is suitable to resonate in a resonance frequency when being excited. When resonating, the resonance element 3 will transmit a radio signal and will act as a radiating element. The resonance frequency is optionally a frequency of the first frequency band. However, the resonance frequency can be outside of the first frequency band, wherein the resonance frequency has to be in a range that allows that the resonance element 3 can be excited by a radio signal in the first frequency band. The resonance frequency is outside of the second frequency band. As the first radiator 1 is transmitting in the first frequency band, the first radiator 1 is also transmitting a radio signal that has the same frequency as the resonance frequency. The resonance element 3, which can act as a radiating element is also suitable to act as a receiving element, is receiving the radio signal from the first radiator 1 and is excited to resonate by the transmitted radio signals of the first radiator 1. The resonance element 3 will be excited to resonate by the portions of the radio signal of the first radiator 1 that is transmitted in the resonance frequency. In other words, the resonance element 3 is aligned to be excited by the transmitted radio signals of the first radiator 1 . The resonance element 3 is excited over-the-air and not by a wired connection.

[0054] As the resonance element 3 is excited by the transmitted radio signals of the first radiator 1 , the resonance element also acts as a transmitter and transmits at least parts of the radio signals of a first frequency band that are transmitted by the first radiator 1 . The resonance element 3 will transmit the radio signals of a first frequency band as the first radiator 1. Accordingly, an overlay of the radio waves can be achieved in a radiation direction of the antenna arrangement 10, which is used for shaping a beamwidth of a transmitted beam.

[0055] Figure 2 shows an illustration of a signal path of a radio signal that is emitted by a first radiator 1. It can be seen that the radio signal of the first radiator 1 is transmitted in a primary direction, wherein a phase of the radio signal at a given position is defined by the shifting angle Qboresight over a supply signal of the first radiator 1. The radio signal is further transmitted towards the resonance element 3 and is then re-transmitted by the resonance element 3 towards the radia-

[0056] 7

[0057] P11 1661 tion direction of the antenna arrangement 10. Compared to the radio signal that is directly transmitted, this leads to an additional phase shift, wherein the additional phase shift is caused by the path length from the first radiator 1 to the resonance element 3, causing a first phase shift 01 cross, and by a phase shift that is caused by the re-transmission of the resonance element 3, causing a second phase shift 01 resonance. It is noted that the additional phase shift can be adjusted by adapting a distance between the first resonator 1 and the resonance element 3.

[0058] Optionally, the second radiator 2 comprises a further resonance element 8, wherein the further resonance element 8 is configured to resonate in the resonance frequency, wherein the further resonance element 8 is aligned to be excited by the transmitted radio signals of the first radiator 1. This is illustrated by example in figure 3. It can be seen that an additional signal path is created, wherein a phase shift is caused by the path length from the first radiator 1 to the further resonance element 8, causing a third phase shift 02crOss, and by a phase shift that is caused by the re-transmission of the further resonance element 8, causing a fourth phase shift 02resonance. It is noted that the additional phase shift can be adjusted by adapting a distance between the first resonator 1 and the further resonance element 8. In addition or in the alternative, the additional phase shift can be adjusted by adapting the resonance frequency.

[0059] Optionally, the distance between the first radiator and the resonance element 3 is a multiple of half of a wavelength of the radio signals of the first frequency band. This will typically lead to an overlay of the radio signals that will reduce a strength of the radio signal to decrease a beamwidth of a beam that is transmitted by the first radiator 1 . However, the distance between the first radiator and the resonance element 3 can derive from the multiple of half of a wavelength of the radio signals of the first frequency band, wherein a correct overlay of the emitted radio signals can be achieved by setting the resonance frequency and the corresponding additional phase shift accordingly.

[0060] By setting the distance between the first radiator and the resonance element 3 and by adjusting the resonance frequency, the H-HPBW can be increased or decreased.

[0061] Figure 4 shows an antenna arrangement 10 according to embodiments of the invention, wherein the first radiator 1 is an antenna of a first antenna array 20 and the second radiator 2 is an antenna of a second antenna array 30. The first antenna array 20 is configured to transmit signals in the first frequency band. The second antenna array 30 is configured to transmit signals in the second frequency band.

[0062] The first radiator 1 , 1a is aligned in one row with further first radiators 1b, 1c, wherein all radiators are of the same type. In Figure 4, the first radiator 1 , 1a and the further first radiators 1 b, 1c 8

[0063] P11 1661 are aligned in a row in a y-direction. The first radiator 1 , 1a and the further first radiators 1b, 1c are together forming the first antenna array 20, which is optionally supporting beam steering. In an example, all radiators 1a, 1b, 1c of the first antenna array 20 are radiators for a lower midband.

[0064] The second radiator 2, 2a is aligned in one row with further second radiators 2b, 2c, wherein all radiators are of the same type. In Figure 4, the second radiator 2, 2a and the further second radiators 2b, 2c are aligned in a row in a y-direction and are aligned in parallel to the first antenna array 20. The second radiator 2, 2a and the further second radiators 2b, 2c are together forming the second antenna array 30, which is optionally supporting beam steering. In an example, all radiators 2a, 2b, 2c of the second antenna array 30 are radiators for a midband. Each radiator of the second antenna array 30 comprises a corresponding resonance element 3a, 3b, 3c that is configured to resonate in a frequency of the first frequency band.

[0065] The antenna arrangement 10 of Figure 4 further comprises a third antenna array 21 and a fourth antenna array 31. The third antenna array 21 is essentially identical to the first antenna array 20 and is aligned in parallel to the first antenna array 20. The fourth antenna array 31 is essentially identical to the second antenna array 30 and is aligned in parallel to the second antenna array 30. The first antenna array 20 and the third antenna array 21 are aligned in between the second antenna array 20 and the fourth antenna array 31.

[0066] The fourth antenna array 31 is essentially identical to the second antenna array 30. It is noted that the fourth antenna array 31 is rotated by 180 degrees in respect to the second antenna array 30, such that the resonance elements 7a, 7b, 7c of the fourth antenna array 31 are on a side of the third antenna array 21, while the resonance elements 3a, 3b, 3c of the second antenna array 30 are on a side of the first antenna array 20. Such rotation is not necessary if the resonance elements 7a, 7b, 7c of the fourth antenna array 31 and the resonance elements 3a, 3b, 3c of the second antenna array 30 are aligned symmetrically on the corresponding radiators when considering that the symmetry axis is aligned in y-direction through the centre of each radiator.

[0067] Figure 5 shows an exemplary second radiator 2 according to embodiments of the invention. The second radiator 2 comprises a first radiator element 40, a second radiator element 41 , a third radiator element 42 and a fourth radiator element 43. The radiator elements 40, 41, 42, 43 are loop-elements. That is, each one of the radiator elements 40, 41, 42, 43 is forming a loop. The shape of the radiator elements 40, 41, 42, 43 is the same, wherein not necessarily all radiator elements 40, 41 , 42, 43 comprise a resonance element. However, it is advantageous that each one of the radiator elements 40, 41 , 42, 43 comprises a corresponding resonance element 3, as 9

[0068] P11 1661 this allows a mounting of the second radiator 2 without a consideration of a correct alignment and it can be avoided that a unsymmetric structure of the second radiator 2 that is caused by the resonance elements leads to a undesired beam shape for a radio signal that is transmitted by the second radiator 2. The radiator elements 40, 41 , 42, 43 are rotated by 90 degrees in respect to each other, such that each radiating element is pointing in a different direction.

[0069] A radio signal in the second frequency band is transmitted by the second radiator, wherein a radio signal of a first polarisation is emitted at gaps 70, 71 between the first radiator element 40 and the second radiator element 41 and between the third radiator element 42 and the fourth radiator element 43. A radio signal of a second polarisation is emitted at gaps 72, 73 between the second radiator element 41 and the third radiator element 42 and between the first radiator element 40 and and the fourth radiator element 43. For this, a feeding network is providing a ground signal and an analog signal to the radiator elements 40, 41 , 42, 43 at respective opposing sides of the gaps.

[0070] In the following, it is referred to the resonance element 3 of the first radiator element 40. The other radiator elements 41 , 42, 43 optionally comprise equivalent resonance elements. For example, the third radiator element 42, which is an opposite radiator element of the first radiator element 40, can comprise the further resonance element 8.

[0071] The resonance element 3 is a LC-circuit, wherein the LC-circuit is configured to resonate in the resonance frequency. The LC-circuit of the resonance element 3 comprises a capacitive component 44 and an inductive component 45. The capacitive component 44 is formed by a gap 47 in the loop-element that is forming the first radiator element 40. The inductive component 45 is formed by a connection-loop 46, wherein the connection loop 46 is connecting different sides of the loop-element that are separated by the gap 47. The combination of the capacitive component 44 and the inductive component 45 is forming the LC-circuit. The resonance frequency can be adjusted by changing the width or length of the gap 47 and / or by changing the width or length of the connection-loop 46. It is noted that the capacitive component 44 that is formed by a gap 47 is also suitable to increase a bandwidth of the second radiator.

[0072] The resonance element 3 is a portion of the first radiator element 40. More specifically, the resonance element 3 is partially aligned at an inner side of a conductive loop that is forming the first radiator element 40. This alignment has the advantage that an outer side of the conductive loop that is forming the first radiator element 40 can be closer to the first radiator 1 , while maintaining a distance between the resonance element 3 and the first radiator 1.

[0073] 10

[0074] P11 1661 The resonance element 3 is configured to act as a filter, wherein the filter is configured to filter a frequency of the second frequency band, wherein the frequency of the second frequency band is different from the resonance frequency.

[0075] In Error! Reference source not found., a head with resonance element 3 is displayed and shows 90° polarized signals with a connection between them. In this connection, the parallel LC-Element is placed. The filter is designed to be resonant in a frequency band that is not used by the radiator itself but by a neighbouring radiator. This is limiting the use of the filter to a system that consists of radiators working in different frequency bands.

[0076] The use case is therefore preferably defined by a system with different radiator types close to each other. E.g., a passive antenna with a mix of MB and LMB radiators as shown in Error! Reference source not found.. The outer column radiators work from 1.690 - 2.690 GHz (MB -Mid Band). The inner columns are more broadband and work from 1.427 - 2.690 GHz (LMB -Lower Mid Band). The frequency band, that is not used by both radiators, can be used to place the filter design. In this case its 1.427 - 1.690 GHz.

[0077] The resonance element 3 is not affecting the MB-Radiator performance since the frequency band is not used by it. When the filter is placed in the arms of the MB-Radiator, the radiator will be mismatched for the filter frequency band and therefore the feeding ports will accept less energy in this band. This leads to an improved isolation. At the same time the resonance element 3 is resonant to a part of the neighbour radiator frequency band. This will catch the signal coming as a part of the mutual coupling between neighbours and reradiate it. This will happen in any case when radiators are placed next to each other that share the same frequency band. With the resonance element 3, this cross talk can be phase shifted to alter the resulting pattern created by the radiator and the reradiated cross talk.

[0078] Figures 6a and 6b are depicting a measurement setup and measurement results for different radiator types.

[0079] The measurement setup is illustrated by figure 6a. Four lower-midband radiators 51 are positioned in between four midband radiators 52. The lower-midband radiators 51 and the midband radiators 52 are partially covered by two lowband radiators 53. In the following, different radiators are used as lower-midband radiators 51 and midband radiators 52.

[0080] The measurement results are depicted in Figure 6b, wherein a horizontal half power beam width of the lower-midband radiators 51 is illustrated over the frequencies of the first frequency band.

[0081] 11

[0082] P111661 A first graph 61 is illustrating the results for a first measurement setup in which neither the lower-midband radiators 51 nor the four midband radiators 52 comprise a resonance element 3. The midband radiators 52 have the structure of the second radiator 2 of Figure 5, wherein the resonance elements 3, 8, 48, 49 are omitted. It can be seen that the horizontal half power beam width in a frequency range between 1.4 and 1.6 GHz is for this measurement setup is a range between 80 and 100 degrees.

[0083] A second graph 62 is illustrating the results for a second measurement setup in which neither the lower-midband radiators 51 nor the four midband radiators 52 comprise a resonance element 3, wherein an alternative radiator to the first measurement setup is used. It can be seen that the horizontal half power beam width in a frequency range between 1.4 and 1.6 GHz is for this measurement setup is a range between 80 and 100 degrees.

[0084] A third graph 63 is illustrating the results for a third measurement setup in which the lower-mid-band radiators 51 are the same as the ones of the first measurement setup. The four midband radiators 52 have the structure of the second radiator 2 of Figure 5 and therefore comprise the resonance element 3. It can be seen that the horizontal half power beam width in a frequency range between 1.4 and 1.6 GHz for this measurement setups is a range between 65 and 80 degrees and has therefore been reduced when compared to the first measurement setup by adding the resonance element 3.

[0085] A fourth graph 64 is illustrating the results for a fourth measurement setup in which the lower-midband radiators 51 are the same as the ones of the second measurement setup. The four midband radiators 52 have the structure of the second radiator 2 of Figure 5 and therefore comprise the resonance element 3. It can be seen that the horizontal half power beam width in a frequency range between 1.4 and 1.6 GHz for this measurement setups is a range between 60 and 75 degrees and has therefore been reduced when compared to the second measurement setup by adding the resonance element 3.

[0086] Figure 7 shows a flow-chart of a method 100 for transmitting a radio signal by an antenna arrangement 10.

[0087] In a first step 101 radio signals of a first frequency band are transmitted by a first radiator 1 of the antenna arrangement 10.

[0088] In a second step 102 radio signals of a second frequency band are transmitted by a second radiator 2 of the antenna arrangement 10, wherein the second frequency band is different from the first frequency band.

[0089] 12

[0090] P11 1661 In a third step 103, a resonance element 3 is excited by the transmitted radio signals of the first radiator 1 to resonate in a resonance frequency, wherein the resonance frequency is outside of the second frequency band. As the resonance element 3 is excited, it will re-transmit the radio signals of the first radiator 1.

[0091] 13

[0092] P111661

Claims

Claims1. Antenna arrangement (10), comprising:a first radiator (1), wherein the first radiator is configured to transmit radio signals of a first frequency band;a second radiator (2), wherein the second radiator (2) is configured to transmit radio signals of a second frequency band, the second frequency band being different from the first frequency band;wherein the second radiator (2) comprises a resonance element (3), wherein the resonance element (3) is configured to resonate in a resonance frequency, wherein the resonance frequency is outside of the second frequency band; andwherein the resonance element (3) is configured to be excited by the transmitted radio signals of the first radiator (1).

2. The antenna arrangement (10) according to claim 1 , wherein the resonance frequency is a frequency of the first frequency band.

3. The antenna arrangement (10) according to any one of the previous claims, wherein the resonance element (3) is a LC-circuit.

4. The antenna arrangement (10) according to any one of the previous claims, wherein the second radiator (2) comprises a first radiator element (40) and a second radiator element (41), wherein the resonance element (3) is a portion of the first radiator element (40) or the second radiator element (41).

5. The antenna arrangement (10) according to claim 4, wherein the first radiator element (40) comprises a loop-element and / or the second radiator element (41) comprises a loop-element.

6. The antenna arrangement (10) according to claim 5, wherein the resonance element (3) is at least partially aligned at an inner side of the loop-element.14P11 16617. The antenna arrangement (10) according to any one of claims 5 and 6, wherein the resonance element (3) comprises a capacitive component (44), which is formed by a gap in the loop-element, and a inductive component (45), which is formed by a connection-loop, wherein the connection loop is connecting different sides of the loop-element that are separated by the gap.

8. The antenna arrangement according to any one of the previous claims, wherein the second radiator comprises a further resonance element, wherein the further resonance element (3) is configured to resonate in the resonance frequency, wherein the further resonance element (3) is configured to be excited by the transmitted radio signals of the first radiator.

9. The antenna arrangement according to any one of the previous claims, wherein the first radiator and the second radiator are both mounted above a common reflector (4).

10. The antenna arrangement according to any one of the previous claims, wherein the first radiator (1) and the second radiator (2) are neighbouring radiators.

11. The antenna arrangement according to any one of the previous claims, wherein a distance between the first radiator and the resonance element is a multiple of half of a wavelength of the radio signals of the first frequency band.

12. The antenna arrangement according to any one of the previous claims, wherein the first radiator (1) is an antenna of a first antenna array (20) and the second radiator (2) is an antenna of a second antenna array (30).

13. The antenna arrangement according to claim 12, wherein each radiator of the second antenna array comprises a corresponding resonance element that is configured to resonate in a frequency of the first frequency band.

14. Antenna (80), comprising the antenna arrangement (10) according to any of the previous claims.

15. A method (100) for transmitting a radio signal by an antenna arrangement (10), comprising:transmitting (101) radio signals of a first frequency band by a first radiator (1); transmitting (102) radio signals of a second frequency band by a second radiator (2), the second frequency band being different from the first frequency band; and15P11 1661exciting (103) a resonance element (3) by the transmitted radio signals of the first radiator (1) to resonate in a resonance frequency, wherein the resonance frequency is outside of the second frequency band.16P111661

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