CN218215692U - Reflector for base station antenna and base station antenna - Google Patents

Abstract

The present disclosure relates to a reflector for a base station antenna, wherein the reflector comprises: a body; and at least one through slot provided in the body, the at least one through slot being configured for forming at least one stub-type filtering structure in the body, the stub-type filtering structure being configured for at least partially suppressing induced currents in the body within an operating frequency band of a radiating element mounted behind the reflector. Furthermore, the present disclosure relates to a base station antenna.

Description

Reflector for base station antenna and base station antenna

Technical Field

The present disclosure relates to the field of radio communications, and more particularly, to a reflector for a base station antenna and a base station antenna.

Background

With the development of wireless communication technology, integrated base station antennas including passive modules and active modules have emerged. The passive module may comprise one or more arrays of radiating elements configured to generate a relatively static antenna beam, for example an antenna beam configured to cover a 120 degree sector (in the azimuth plane) of the integrated base station antenna. The array may comprise an array operating under a second generation (2G), third generation (3G) or fourth generation (4G) cellular network standard, for example. These arrays are not configured to perform active beamforming operations, although they typically have a Remote Electronic Tilt (RET) function that allows the pointing direction of the antenna beam in the pitch plane to be changed by electromechanical means in order to change the coverage area of the antenna beam. The active module may include one or more arrays of radiating elements operating under a fifth generation (5G or higher) cellular network standard. In the fifth generation mobile communication, the frequency range of communication includes a primary frequency band (which is a specific part of the range of 450MHz to 6 GHz) and an extension frequency band (24 GHz to 73GHz, i.e., a millimeter wave frequency band, which is mainly 28GHz, 39GHz, 60GHz, and 73 GHz). The frequency range to be used in the fifth generation mobile communication includes a frequency band higher than the frequencies used in the previous generations of mobile communication. These arrays typically have individual amplitude and phase control over a subset of the radiating elements therein and perform active beamforming.

As shown in fig. 1 and 2, the integrated base station antenna 10 may include a passive module 11 and an active module 12 mounted on the back or rear of the passive module 11. The passive module 11 includes one or more arrays of radiating elements 115 mounted to extend forward from the reflector 13 (shown in fig. 3) of the passive module 11. The reflector 13 is used to reflect electromagnetic waves emitted backwards by the radiating elements 115 in the forward direction, and said reflector 13 also serves as a ground plane for the radiating elements 115 of the array. The active module 12 may emit high frequency electromagnetic waves (e.g., high frequency electromagnetic waves in the 2.3-4.2GHz band or portion thereof). At least a portion of the active module 12 is typically mounted behind the passive module 11.

Since the reflector 13 in the passive module 11 is disposed in front of the active module 12, when the electromagnetic wave from the active module 12 is radiated forward through the passive module 11, an induced current, for example, an induced current in an operating frequency band of the active module 12 may be formed or induced on the reflector 13 of the passive module 11. Such induced currents may result in poor radiation performance of the integrated base station antenna 10, such as distortion of the radiation pattern or "antenna beam" of the active module 12 and/or reduced cross-polarization discrimination. Current countermeasures usually involve a reduction in the size of the reflector 13, but the effect of said countermeasures is limited, since the size of the reflector 13 can only be reduced to a limited extent and induced currents can still be present on the reflector 13. Furthermore, as the size of the reflector 13 decreases, the radiation pattern of the passive module 11 also deteriorates. These are undesirable.

SUMMERY OF THE UTILITY MODEL

It is therefore an object of the present disclosure to provide a reflector for a base station antenna and a base station antenna that overcome at least one of the drawbacks of the prior art.

According to a first aspect of the present disclosure, there is provided a reflector for a base station antenna, wherein the reflector comprises: a body; and at least one through slot provided in the body, the at least one through slot being configured for forming at least one stub-type filtering structure in the body, the stub-type filtering structure being configured for at least partially suppressing induced currents in the body within an operating frequency band of a radiating element mounted behind the reflector.

In some embodiments, the at least one stub-type filtering structure may include at least one open stub.

In some embodiments, the longitudinal length of the at least one open stub may be 0.25+ n/2 times an equivalent wavelength, n being a natural number, wherein the equivalent wavelength is a wavelength corresponding to a predetermined frequency point in the operating band.

In some embodiments, a longitudinal length of the at least one open stub may be configured to be 0.25 times the equivalent wavelength.

In some embodiments, the predetermined frequency point may be a center frequency point of the operating frequency band.

In some embodiments, the at least one through slot may include an H-shaped, L-shaped, M-shaped, U-shaped, S-shaped, or fan-shaped through slot for forming the at least one open stub.

In some embodiments, the at least one stub-type filtering structure may include at least one short stub.

In some embodiments, the longitudinal length of the at least one short stub may be N/2 times an equivalent wavelength, N being a positive integer, wherein the equivalent wavelength is a wavelength corresponding to a predetermined frequency point in the operating frequency band.

In some embodiments, a longitudinal length of the at least one short stub may be configured to be 0.5 times the equivalent wavelength.

In some embodiments, the predetermined frequency point may be a center frequency point of the operating frequency band.

In some embodiments, the at least one through slot may include two through slots for forming a single short stub, which is formed between the two through slots.

In some embodiments, the through-slots may be configured as metal-free cutouts on the body.

In some embodiments, the at least one stub-type filtering structure may include a plurality of stub-type filtering structures that are non-periodically arranged in at least one direction.

In some embodiments, the at least one direction may comprise a vertical direction and/or a horizontal direction of the reflector.

In some embodiments, the plurality of stub-type filtering structures may include at least one open stub and at least one short stub.

In some embodiments, at least two of the plurality of stub-type filtering structures may have different orientations, sizes, and/or shapes.

In some embodiments, the at least one stub-type filtering structure may include: a first stub-type filtering structure configured to at least partially suppress a first induced current within a predetermined first frequency band; and a second stub-type filtering structure configured for at least partially suppressing a second induced current lying within a predetermined second frequency band; wherein the first frequency band is the operating frequency band and the first frequency band is different from the second frequency band.

In some embodiments, the first and second stub-type filtering structures may be open stubs having different longitudinal lengths, or may be short stubs having different longitudinal lengths.

In some embodiments, one of the first and second stub-type filtering structures may be an open stub, and the other stub-type filtering structure may be a short stub.

In some embodiments, the at least one stub-type filtering structure may comprise a multi-order stub-type filtering structure.

In some embodiments, the body may comprise a reflective strip section extending in a vertical direction, the reflective strip section being configured for mounting a radiating element, the at least one through slot being at least partially provided on the reflective strip section for forming at least one said stub-type filtering structure on the reflective strip section.

In some embodiments, the body may include first and second reflective strip sections laterally of the horizontal direction with an opening disposed therebetween.

In some embodiments, the reflector may include a partition extending in a vertical direction, the partition extending forward from the body of the reflector.

In some embodiments, at least one further through slot may be provided on the partition, the at least one further through slot being configured for forming at least one further truncated filtering structure in the partition, the at least one further truncated filtering structure being configured for at least partially suppressing induced currents in the partition within an operating frequency band.

According to a first aspect of the present disclosure, there is provided a base station antenna comprising a reflector for a base station antenna as described above.

In some embodiments, the base station antenna may include a passive module in which the reflector and a reflection compensation plate separated from the reflector are installed and which includes a frequency selective surface composed of a plurality of pattern units periodically arranged, and an active module installed at the rear of the passive module.

In some embodiments, the frequency selective surface may be configured to reflect electromagnetic waves in a second frequency band while allowing electromagnetic waves in a first frequency band to pass, wherein the first frequency band corresponds to an operating frequency band of at least a portion of the radiating elements within the passive module and the second frequency band corresponds to an operating frequency band of at least a portion of the radiating elements within the active module.

In some embodiments, the reflector may comprise a first and a second reflector strip section for mounting the radiating element, with an opening provided between the first and the second reflector strip section, wherein the reflective compensation plate is mounted behind the reflector and at least partially overlaps the opening in a projection in the forward direction.

In some embodiments, the reflective compensation plate may be mounted in front of the rear housing of the passive module, or the reflective compensation plate may be formed as at least a part of the rear housing of the passive module.

In some embodiments, the plurality of pattern units may be metal pattern units constructed on a metal plate or a printed circuit board.

In some embodiments, the passive module may comprise a 4G module.

In some embodiments, the active module may comprise a 5G module.

Drawings

The disclosure is explained in more detail below with the aid of specific embodiments with reference to the drawings. The schematic drawings are briefly described as follows:

fig. 1 is a schematic perspective view of a base station antenna according to the prior art, comprising a passive module and an active module mounted on the back of the passive module;

FIG. 2 is a schematic end view of the base station antenna shown in FIG. 1;

FIG. 3 is a perspective view of a reflector used in the base station antenna shown in FIG. 1;

fig. 4 is a partially schematic perspective view of a passive module of a base station antenna according to some embodiments of the present disclosure;

FIG. 5 is a partial schematic front view of the base station antenna of FIG. 4 showing a reflector strip section of a reflector within a passive module along with a reflector and an array of radiating elements within a rear active module;

fig. 6 is a partial schematic front view of a base station antenna showing a reflector bar segment of a reflector within a passive module along with a reflector and an array of radiating elements within an active module behind according to further embodiments of the present disclosure;

FIG. 7 is a partial schematic front view of a base station antenna showing a reflector strip section of a reflector within a passive module along with a reflector and an array of radiating elements within an active module behind according to further embodiments of the present disclosure;

FIG. 8 is a front view of a stub-type filtering structure in a reflector of a base station antenna according to further embodiments of the present disclosure;

fig. 9 is a partially schematic, perspective view of a base station antenna according to further embodiments of the present disclosure, wherein a reflector within a passive module includes a reflector strip section and a divider extending in a forward direction;

Fig. 10 is a partial schematic front view of a base station antenna showing a reflector strip section of a reflector within a passive module along with a reflector and an array of radiating elements within an active module behind according to still other embodiments of the present disclosure.

Detailed Description

The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the disclosure. It should be understood, however, that the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, the embodiments described below are intended to provide a more complete disclosure of the present disclosure, and to fully convey the scope of the disclosure to those skilled in the art. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present disclosure. All terms (including technical and scientific terms) used herein have the meaning commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

In this document, spatially relative terms, such as "upper," "lower," "left," "right," "front," "back," "upper," "lower," and the like, may describe one feature's relationship to another feature in the figures. It will be understood that the terms "spatially relative" encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, features originally described as "below" other features may be described as "above" other features when the device in the figures is inverted. The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial relationships may be interpreted accordingly.

Herein, the term "a or B" includes "a and B" and "a or B" rather than exclusively including "a" or "B" only, unless specifically stated otherwise.

In this document, the terms "schematic" or "exemplary" mean "serving as an example, instance, or illustration," and not as a "model" that is to be reproduced exactly. Any implementation exemplarily described herein is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, the disclosure is not limited by any expressed or implied theory presented in the preceding technical field, background, utility model content, or detailed description.

In this document, the term "substantially" is intended to encompass any minor variations due to design or manufacturing imperfections, tolerances of the devices or components, environmental influences and/or other factors.

In this context, the term "partially" may be any proportion of the portion. For example, it may be greater than 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or even 100%, i.e., all.

In addition, "first," "second," and like terms may also be used herein for reference purposes only, and thus are not intended to be limiting. For example, the terms "first," "second," and other such numerical terms referring to structures or elements do not imply a sequence or order unless clearly indicated by the context.

It should be noted that the base station antennas in fig. 1 to 10 mainly differ in terms of the reflectors of the passive modules, and therefore, in fig. 1 to 10, the same reference numerals are used for the same components in order not to obscure the focus of the present disclosure and to facilitate the understanding of the reader. Furthermore, for ease of illustration, embodiments of the base station antenna according to the present disclosure are also described below, where appropriate, with the aid of fig. 1 to 3.

Fig. 4 illustrates a partial schematic perspective view of a passive module of a base station antenna in accordance with some embodiments of the present disclosure. Fig. 5 shows a partial schematic front view of the base station antenna of fig. 4, showing a reflector strip section of a reflector within a passive module together with a reflector and an array of radiating elements within a rear active module; fig. 6 illustrates a partial schematic front view of a base station antenna showing a reflector bar segment of a reflector within a passive module along with a reflector and an array of radiating elements within an active module behind according to further embodiments of the present disclosure.

A base station antenna 10 according to the present disclosure may include a passive module 11 and an active module 12 (not shown in fig. 4, please refer to fig. 1 and 2) mounted to the rear of the passive module 11.

The passive module 11 may comprise a front housing 111, a rear housing 112, a reflector 13 between the front housing 111 and the rear housing 112, and one or more arrays of radiating elements 115 (not shown in fig. 4, see fig. 2 for an adaptation) in front of said reflector 13 (these arrays are typically mounted on a feeding board in front of the reflector). These arrays are mounted to extend forward from the reflector 13 of the passive module 11 and may include arrays operating under second generation (2G), third generation (3G) or fourth generation (4G) cellular network standards. The front cover 111 and the rear cover 112 of the passive module 11 may be configured as an integral radome, or the front cover 111 and the rear cover 112 may be configured as separate radome components.

Referring adaptively to fig. 2, the active module 12 may be mounted behind the passive module 11 and may include its own reflector 121 and one or more arrays of radiating elements 122 on the reflector 121. These arrays are mounted to extend forwardly from the reflector 121 of the active module 12 and may include arrays operating under fifth or higher generation (5G or 6G) cellular network standards. In the fifth generation mobile communication, the frequency range of communication includes a primary frequency band (which is a specific part of the range of 450MHz to 6 GHz) and an extension frequency band (24 GHz to 73GHz, i.e., a millimeter wave frequency band, which is mainly 28GHz, 39GHz, 60GHz, and 73 GHz).

With adaptive reference to fig. 2 to 3, in order not to obstruct the high frequency electromagnetic waves emitted by the active module 12, an opening 14 is typically provided in the reflector 13 of the passive module 11. The active module 12 may be installed at a position corresponding to the opening 14 so that the high frequency electromagnetic waves emitted from the active module 12 can pass through the opening 14. Beside the horizontal direction x of the opening 14, the body 131 of the reflector 13 may comprise a first reflective strip section 1311 and a second reflective strip section 1312 extending in the vertical direction y. The first and second reflector segments 1311, 1312 may be disposed outside of the corresponding range of the active module 12 and may be configured for mounting the radiating element 115.

In order to reflect electromagnetic waves within a predetermined frequency band, for example, to reflect signals radiated backwards by the radiating elements 115 mounted on the reflector strip sections 1311, 1312, a separate reflection compensation plate 16 may be provided within the passive module 11. The reflection compensation plate 16 may be mounted behind the reflector strip sections 1311, 1312 and partly or completely overlaps the opening 14 formed in the body 131 of the reflector 13 in projection in the forward direction z. Thereby, the reflection compensation plate 16 may at least partly compensate for the negative influence of the reflection properties caused by the opening 14 provided in the reflector 13.

In some embodiments, the reflective compensation plate 16 may be installed in front of the rear cover of the passive module 11. In some embodiments, the reflective compensation plate 16 may be formed as at least a portion of a rear housing of a passive module. In order to avoid the negative influence of the reflection compensation plate 16 on the active module 12 mounted on the rear cover 112 of the passive module 11, the reflection compensation plate 16 may include a frequency selective surface made up of a plurality of pattern elements 161 arranged periodically, for example, in a first direction and a second direction (for example, a vertical direction y and a horizontal direction x), and the frequency selective surface may be configured to allow electromagnetic waves within a predetermined frequency band, for example, electromagnetic waves emitted from the active module 12, to pass therethrough and reflect electromagnetic waves emitted from the passive module 11. In some embodiments, the plurality of pattern units 161 may be metal pattern units constructed on a metal plate or a PCB substrate. The resonance frequency of the reflection compensation plate 16 may be configured by selecting or designing the pattern, size, and pitch, arrangement, etc. of each pattern unit 161 and the plurality of pattern units 161 so that electromagnetic waves within a predetermined frequency band can pass through the reflection compensation plate 16.

As described in the beginning, since the reflector 13 of the passive module 11 is arranged in front of the active module 12, when electromagnetic waves from the active module 12 are radiated onto the reflector 13 of the passive module 11, induced currents may be formed or induced on the reflector 13. The induced current may be, for example, an induced current within an operating frequency band of the radiating element 122 of the active module 12. Such induced currents may adversely affect the radiation performance of the base station antenna 10, for example, causing distortion of the radiation pattern of the active module 12. This is an undesirable effect.

In order to suppress the formation of induced currents on the reflector 13 and thereby avoid the potential above-mentioned adverse effects, the present disclosure proposes a new reflector 13 for the base station antenna 10. Referring to fig. 4 and 5, at least one through slot 132 is provided in the body 131 of the reflector 13 according to the present disclosure, the at least one through slot 132 being configured for forming at least one stub-type filter structure in the body 131, the stub-type filter structure being configured for at least partially suppressing induced currents within a predetermined frequency band in the body 131. In the present disclosure, a "through slot" may be understood as a metal-free cutout on the body.

By introducing specific through slots 132 in the body 131 of the reflector 13 to form a stub-type filtering structure (e.g., open stubs 133, 134 or short stubs 135), induced currents in a predetermined frequency band can be specifically suppressed in the body 131, thereby effectively reducing or eliminating the adverse effects of the induced currents on the radiation performance of the base station antenna 10. It should be understood that the through slots 132 of the present disclosure may be disposed at any location on the reflector 13 as long as induced current needs to be suppressed at the corresponding location of the reflector 13.

In particular, with reference to fig. 4 and 5, at least one through slot 132 may be provided at least partially in a region of the body 131 of the reflector 13 where induced currents need to be suppressed, for example in a reflector strip section 1311, 1312 close to the active module 12, for forming at least one of said truncated filtering structures in said region. The at least one stub-type filter structure may include at least one open stub 133, 134. To this end, as shown in fig. 5, the through groove 132 may be provided in an H-shape. Thus, by providing one H-shaped through groove 132, two open stubs 133 and 134 can be formed to face each other. However, it is contemplated that the through slots 132 may also be provided in other suitable shapes as desired, such as in a U-shape as shown in fig. 6. Furthermore, in some embodiments not shown, the through slots 132 may also be arranged in an L-shape, M-shape, S-shape, or fan-shape.

In some embodiments, the longitudinal length L1 of the open stub 133, 134 may be set to 0.25+ n/2 times an equivalent wavelength, n being a natural number, wherein the equivalent wavelength is a wavelength corresponding to a predetermined frequency point in the predetermined frequency band. Here, the "longitudinal length L1 of the open stub 133, 134" may be understood as a length from a free end to a root of the open stub 133, 134 (see fig. 5 for the longitudinal length L1). The predetermined frequency band may be an operating frequency band of at least a portion of the radiating elements 122 within the active module 12, and the predetermined frequency point may be a center frequency point of the predetermined frequency band. In general, n may be selected to be 0 in order to reduce the longitudinal length L1 of the open stub 133, 134. That is, the longitudinal length L1 of the open stub 133, 134 may be configured to be 0.25 times the equivalent wavelength.

In some embodiments, the stub-type filtering structure formed in the body 131 of the reflector 13 may include: a first stub-type filtering structure configured to at least partially suppress a first induced current within a predetermined first frequency band; and a second stub-type filtering structure configured to at least partially suppress a second induced current within a predetermined second frequency band; wherein the first frequency band is different from the second frequency band. This makes it possible to suppress induced currents in different (that is, wider) predetermined frequency bands in the body 131 of the reflector 13. Here, the first and second stub-type filter structures may be respectively configured as the first and second open stubs 133 and 134 having different longitudinal lengths L1, L1' as shown in fig. 5. Alternatively, the first and second stub-type filter structures may also be configured as short stubs 135 having different longitudinal lengths L2 (the short stubs 135 will be described in more detail below with the aid of fig. 10). In some embodiments, which are not shown, one of the first and second stub-type filtering structures may be configured as an open stub 133, 134, and the other one of them may be configured as a short stub 135.

Fig. 7 illustrates a partial front view of reflector 13 of base station antenna 10 according to further embodiments of the present disclosure. As shown in fig. 7, the through slots 132 may be suitably disposed at any location of the reflector 13 where induced current suppression is desired, and may be provided in any suitable shape, orientation, and/or size to meet specific induced current suppression requirements. That is, the through slots 132 in the reflector 13 may be non-periodically aligned in at least one direction (e.g., the vertical direction y or the horizontal direction x of the reflector 13). Accordingly, the stub-type filter structure formed by the through-groove 132 may include a plurality of stub-type filter structures that are non-periodically arranged in at least one direction (e.g., the vertical direction y or the horizontal direction x of the reflector 13). Here, at least two of the plurality of stub-type filter structures may have different orientations, sizes (e.g., longitudinal lengths), and/or shapes. For example, the two stub-type filter structures configured as open stubs 133-1, 133-2 in FIG. 7 have different orientations. Although the plurality of stub-type filter structures in fig. 7 are all open stubs 133, it is contemplated that the plurality of stub-type filter structures may include at least one open stub 133, 134 and at least one short stub 135, or may include only short stubs 135.

Fig. 8 illustrates a front view of a truncated filtering structure in the reflector 13 of the base station antenna 10 according to further embodiments of the present disclosure. As shown in fig. 8, the through slots 132 (indicated by dashed lines in fig. 8) in the body 131 of the reflector 13 may be configured to form at least one multi-step stub-type filter structure. In some embodiments, the through-slots 132 in the body 131 of the reflector 13 may have a curved profile to form a multi-step stub-type filter structure. The multi-order stub-type filter structure is understood to be a combination of a plurality of single-order stub-type filter structures 133-3, 133-4, 133-5. In the embodiment of fig. 8, no through slots 132 are provided between the plurality of single-order stub-type filter structures 133-3, 133-4, 133-5. However, it is contemplated that through slots 132 may also be provided between the plurality of single-order stub-type filter structures 133-3, 133-4, 133-5. Compared to a single-order stub-type filter structure, the multi-order stub-type filter structure may have a smoother filter window or may achieve a smaller fluctuation range within the filter pass-band.

Fig. 9 shows a partial side view of a reflector 13 of a base station antenna 10 according to further embodiments of the present disclosure, the reflector 13 comprising a barrier 136 extending in a vertical direction y. The barriers 136 extend forwardly from the body 131 of the reflector 13. At least one further through slot 137 may be provided in the partition 136, the at least one further through slot 137 being configured for forming at least one further truncated filtering structure in the partition 136. The further truncated filtering structure is configured for at least partially suppressing induced currents in the partition bars 136 within a predetermined frequency band. The embodiments of the arrangement of the additional truncated-line-shaped filtering structures formed in the partition 136 may be similar to the embodiments of the arrangement of the truncated-line-shaped filtering structures formed in the body 131, and are not described in detail herein.

Figure 10 illustrates a partial front view of the reflector 13 of the base station antenna 10 according to further embodiments of the present disclosure. As shown in fig. 10, the stub-type filter structure formed in the body 131 may include at least one short stub 135. The longitudinal length L2 of the short stub 135 may be set to N/2 times an equivalent wavelength, N being a positive integer, wherein the equivalent wavelength is a wavelength corresponding to a predetermined frequency point in the predetermined frequency band. Here, the "longitudinal length L2 of the short stub 135" may be understood as a length between two roots of the short stub 135 (see fig. 10 for the longitudinal length L2). The predetermined frequency band may be an operating frequency band of the further radiating element 122 within the active module 12 and the predetermined frequency point may be a center frequency point of the predetermined frequency band. In general, N may be selected to be 1 in order to reduce the longitudinal length L2 of the short stub 135. That is, the longitudinal length L2 of the at least one short stub 135 may be configured to be 0.5 times of the equivalent wavelength.

In order to form a single short stub 135, two through grooves 132-1, 132-2 may be provided on the body 131 of the reflector 13, the single short stub 135 being formed between the two through grooves 132-1, 132-2. The two through slots 132-1, 132-2 may be arranged to include at least elongate through slot 132 sections extending parallel to each other for forming a single short stub 135. As shown in FIG. 10, the two through slots 132-1, 132-2 may be provided as elongated through slots.

In the above, the technical concepts of the reflector 13 for the base station antenna 10 and the base station antenna 10 of the present disclosure are exemplarily explained only by taking the reflector 13 disposed in the passive module 11 of the base station antenna 10 as an example, however, these are not to be construed as limitations to the present disclosure, and the reflector 13 according to the embodiments of the present disclosure may also be suitably applied to other types of base station antennas 10 according to actual needs.

Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without substantially departing from the spirit and scope of the present disclosure. Accordingly, all such variations and modifications are intended to be included herein within the scope of this disclosure.

Claims (32)

1. A reflector for a base station antenna, the reflector comprising:

a body; and

at least one channel disposed in the body, the at least one channel configured for forming at least one stub-type filtering structure in the body, the stub-type filtering structure configured for at least partially suppressing induced current in the body within an operating frequency band of a radiating element mounted behind the reflector.

2. The reflector for a base station antenna of claim 1, wherein the at least one stub-type filtering structure comprises at least one open stub.

3. The reflector for a base station antenna of claim 2, wherein the longitudinal length of the at least one open stub is 0.25+ n/2 times an equivalent wavelength, n being a natural number, wherein the equivalent wavelength is a wavelength corresponding to a predetermined frequency point in the operating band.

4. The reflector for a base station antenna of claim 3, wherein a longitudinal length of the at least one open stub is configured to be 0.25 times the equivalent wavelength.

5. A reflector for a base station antenna according to claim 3, characterized in that said predetermined frequency point is a center frequency point of said operating frequency band.

6. The reflector for a base station antenna of claim 2, wherein the at least one through slot comprises an H-shaped, L-shaped, M-shaped, U-shaped, S-shaped, or fan-shaped through slot for forming the at least one open stub.

7. The reflector for a base station antenna of claim 1, wherein the at least one stub-type filtering structure includes at least one short stub.

8. The reflector for a base station antenna of claim 7, wherein the longitudinal length of the at least one short stub is N/2 times an equivalent wavelength, N being a positive integer, wherein the equivalent wavelength is a wavelength corresponding to a predetermined frequency point in the operating frequency band.

9. The reflector for a base station antenna of claim 8, wherein a longitudinal length of the at least one short stub is configured to be 0.5 times the equivalent wavelength.

10. The reflector for a base station antenna of claim 8, wherein the predetermined frequency point is a center frequency point of the operating frequency band.

11. The reflector for a base station antenna of claim 7, wherein the at least one through slot includes two through slots for forming a single short stub, the single short stub being formed between the two through slots.

12. The reflector for a base station antenna of claim 1, wherein the through-slot is configured as a metal-free cutout on the body.

13. The reflector for a base station antenna of claim 1, wherein the at least one stub-type filter structure comprises a plurality of stub-type filter structures non-periodically arranged along at least one direction.

14. The reflector for a base station antenna of claim 13, wherein the at least one direction comprises a vertical direction and/or a horizontal direction of the reflector.

15. The reflector for a base station antenna of claim 13, wherein the plurality of stub-type filtering structures comprises at least one open stub and at least one short stub.

16. The reflector for a base station antenna of claim 13, wherein at least two of the plurality of stub-type filtering structures have different orientations, sizes and/or shapes.

17. The reflector for a base station antenna of claim 1, wherein the at least one stub-type filtering structure comprises:

a first stub-type filtering structure configured to at least partially suppress a first induced current within a predetermined first frequency band; and

a second stub-type filtering structure configured to at least partially suppress a second induced current within a predetermined second frequency band;

wherein the first frequency band is the operating frequency band and the first frequency band is different from the second frequency band.

18. The reflector for a base station antenna of claim 17, wherein the first stub-type filtering structure and the second stub-type filtering structure are open stubs having different longitudinal lengths, or are short stubs having different longitudinal lengths.

19. The reflector of claim 17, wherein one of the first and second stub-type filtering structures is an open stub and the other stub-type filtering structure is a short stub.

20. The reflector for a base station antenna of claim 1, wherein the at least one stub-type filter structure comprises a multi-order stub-type filter structure.

21. The reflector for a base station antenna of claim 1, wherein the body includes a reflective strip section extending in a vertical direction, the reflective strip section configured for mounting a radiating element, the at least one through slot being at least partially disposed on the reflective strip section for forming at least one of the stub-type filtering structures on the reflective strip section.

22. The reflector for a base station antenna of claim 21, wherein the body includes first and second reflector segments laterally of the horizontal direction with an opening disposed therebetween.

23. The reflector for a base station antenna of claim 1, comprising a partition extending in a vertical direction, the partition extending forward from a body of the reflector.

24. A reflector for a base station antenna according to claim 23, characterized in that at least one further through slot is provided on the partition, said at least one further through slot being configured for forming at least one further truncated filtering structure in the partition, said at least one further truncated filtering structure being configured for at least partially suppressing induced currents in the partition within an operating frequency band.

25. A base station antenna, characterized in that it comprises a reflector for a base station antenna according to any one of claims 1 to 24.

26. The base station antenna according to claim 25, wherein the base station antenna comprises a passive module in which the reflector and a reflection compensation plate separated from the reflector are installed and an active module installed at the rear of the passive module, the reflection compensation plate comprising a frequency selective surface composed of a plurality of pattern units arranged periodically.

27. The base station antenna of claim 26, wherein the frequency selective surface is configured to reflect electromagnetic waves in a second frequency band corresponding to an operating frequency band of at least a portion of the radiating elements within the passive module, and to allow electromagnetic waves in the first frequency band to pass through.

28. The base station antenna according to claim 26, wherein the reflector comprises a first reflector strip section and a second reflector strip section for mounting the radiating element, an opening being provided between the first reflector strip section and the second reflector strip section, wherein the reflective compensation plate is mounted behind the reflector and at least partially overlaps the opening in a projection in the forward direction.

29. The base station antenna of claim 28, wherein the reflective compensation plate is mounted in front of or formed as at least a part of a rear housing of the passive module.

30. The base station antenna according to claim 26, wherein the plurality of pattern elements are metal pattern elements configured on a metal plate or a printed circuit board.

31. The base station antenna of claim 26, wherein the passive module comprises a 4G module.

32. The base station antenna of claim 26, wherein the active module comprises a 5G module.

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