Dual frequency power source, antenna device and wireless communication device

Description

TECHNICAL FIELD

[0001] This disclosure generally relates to the field of communication technologies, and the invention in particular relates to a dual-band feed, an antenna device, and a wireless communication device.BACKGROUND

[0002] As a technical means for effectively improving a network transmission capacity, a dual-band antenna transmits a high-frequency signal and a low-frequency signal on a same link, and combines a large capacity of a high frequency band and a long distance of a low frequency band. In this way, the dual-band antenna provides the large capacity, and enhances a quality of service (quality of service, QoS) service protection mechanism. The high-frequency signal, for example, an E-band signal having a wide channel bandwidth, has features such as a large space loss, large rain attenuation, and a narrow beam. As a result, the high-frequency signal has poor anti-shake performance, and a transmission distance and stability of the high-frequency signal are limited. Consequently, operating performance of the dual-band antenna is limited.

[0003] A dual-band feed is a core component of the dual-band antenna. A structure of the dual-band feed determines the operating performance of the dual-band antenna to a great extent. Currently, the dual-band antenna uses a dual-band coaxial feed to implement dual-band operation. An outer conductor is a coaxial horn operating in a low frequency band, and an inner conductor is a dielectric rod operating in a high frequency band. Although integration of the dual-band coaxial feed can be implemented, the dual-band antenna has a small beam width in the high frequency band, and has a poor anti-shake capability. In addition, a maximum gain angle of the dual-band antenna deviates from a direction of arrival, which easily causes performance deterioration or even interruption on a high-frequency link.

[0004] US 3,665,481 A discloses a microwave antenna useful on a spacecraft, which utilizes a single dish reflector and single coaxial horn structure to transmit at two frequencies, and to receive signals at a third frequency that allow tracking. The horn structure includes a coaxial wave-guide with an inner pipe for transmitting X-band waves, an intermediate pipe, surrounding the inner pipe for transmitting S-band waves through the space between it and the inner pipe, and an outer pipe surrounding the intermediate pipe for receiving S-band tracking signals. An outer horn flares from the outer pipe and an inner horn flares from the inner pipe.

[0005] US 4,283,728 A discloses a five-horn Cassegrain antenna comprising a main dish, an up-taper subreflector set on the boresight axis of the main dish, and including a sum horn positioned on the boresight axis between the subreflector and the main dish with four error horns set therearound. The aperture of the sum horn is relatively large to substantially eliminate radiation spillover at the up-taper subreflector. The error horns are positioned around this large aperture sum horn such that the radiation patterns of paired error horns will crossover in their sidelobes. These error horns are provided with a high aspect ratio with the narrow dimension of each error horn being located in the plane of its tracking crossover with the radiation pattern of the other error horn with which it is paired.

[0006] US 2003 / 222733 A1 discloses an antenna feed system that comprises a single horn having corrugations and four evenly spaced waveguide ports on sides of a single one of the corrugations. A combiner network receives signals at approximatelyGHz from the four waveguide ports and outputs sum and difference output signals. A transducer provides transmit signals at approximatelyGHz and approximatelyGHz to a rear end of the single horn.

[0007] US 10,916,849 B2 discloses a coaxial dual-band antenna, including a waveguide tube, a ring groove, a high frequency feed, and a dielectric ring. The high frequency feed and the dielectric ring have a same axis with the waveguide tube. The waveguide tube has a tubular structure, and is configured to transmit a first electromagnetic wave, the ring groove whose opening direction is the same as an output direction of the first electromagnetic wave is on a wall of the waveguide tube. The high frequency feed is located in the waveguide tube. The dielectric ring is filled between the waveguide tube and the high frequency feed, and has a multi-layer structure. The area sizes of planes that are at layers of the dielectric ring and that are perpendicular to the axis alternately change, and a height of the dielectric ring is less than a height of the waveguide tube.SUMMARY

[0008] The object of the present invention is to provide a dual-band feed, an antenna device, and a wireless communication device, to improve an anti-shake capability of a dual-band antenna with improved self-tracking precision in its feeding assembly. This object is solved by the attached independent claims and further embodiments and improvements of the invention are listed in the attached dependent claims. Hereinafter, up to the "brief description of the drawings", expressions like "...aspect according to the invention", "according to the invention", or "the present invention", relate to technical teaching of the broadest embodiment as claimed with the independent claims. Expressions like "implementation", "design", "optionally", "preferably", "scenario", "aspect" or similar relate to further embodiments as claimed, and expressions like "example", "...aspect according to an example", "the disclosure describes", or "the disclosure" describe technical teaching which relates to the understanding of the invention or its embodiments, which, however, is not claimed as such.

[0009] According to a first aspect of the invention, the invention provides a dual-band feed is provided. The dual-band feed may be used in an antenna device, and the antenna device is configured to receive a beam. The dual-band feed includes a service waveguide and a plurality of amplitude comparison waveguides located outside the service waveguide. The service waveguide includes an outer waveguide and an inner waveguide nested inside the outer waveguide, the inner waveguide is coaxial with the outer waveguide, and the plurality of amplitude comparison waveguides include a first amplitude comparison waveguide and a second amplitude comparison waveguide that are symmetrically disposed relative to an axis of the outer waveguide. A first end of the inner waveguide, a first end of the outer waveguide, and first ends of the plurality of amplitude comparison waveguides are respectively configured to receive a first signal, a second signal, and a third signal in the beam, second ends of the plurality of amplitude comparison waveguides are configured to connect to a self-tracking module, and the self-tracking module is configured to adjust a maximum gain direction of an antenna.

[0010] Because the outer waveguide and the inner waveguide are coaxial, a maximum gain direction corresponding to the first signal is consistent with a maximum gain direction corresponding to the second signal. In addition, because a main beam in a beam pattern is usually symmetrical relative to a beam direction, and the first amplitude comparison waveguide and the second amplitude comparison waveguide are symmetrically disposed relative to the axis of the outer waveguide, when the antenna device is aligned with the maximum gain direction, gains of signals received by the first amplitude comparison waveguide and the second amplitude comparison waveguide are the same. A dual-reflector antenna is used as an example. When the beam is biased toward the first amplitude comparison waveguide, a gain of a first sub-signal received by the first amplitude comparison waveguide is less than a gain of a second sub-signal received by the second amplitude comparison waveguide. When the beam is biased toward the second amplitude comparison waveguide, the gain of the second sub-signal is less than the gain of the first sub-signal. Therefore, the first sub-signal and the second sub-signal may be used to determine a difference between a current maximum gain direction of the antenna device and maximum gain directions corresponding to the first signal and the second signal. In this way, the self-tracking module may adjust the maximum gain direction of the antenna device based on the first sub-signal and the second sub-signal, to increase gains of the first signal and the second signal. This helps improve receiving performance of the antenna device, and improve anti-shake performance of the antenna device. When the beam carries communication information, uplink performance is ensured.

[0011] In addition, service signals are provided by receiving signals in the beam through the service waveguide, and tracking signals are provided by receiving signals in the beam through the plurality of amplitude comparison waveguides other than the service waveguide. Therefore, a second end of the inner waveguide or a second end of the outer waveguide does not need to be connected to a feeding network used to extract a common-mode signal and a differential-mode signal from corresponding received signals. This helps reduce process complexity, and therefore reduce processing difficulty and costs.

[0012] Optionally, the dual-band feed further includes a columnar structure, the outer waveguide, the inner waveguide, and the plurality of amplitude comparison waveguides separately penetrate two ends of the columnar structure, and the first end of the outer waveguide, the first end of the inner waveguide, and a first end of each amplitude comparison waveguide face a first end of the columnar structure. The service waveguide and the plurality of amplitude comparison waveguides are processed in a penetrating manner through the two ends of the columnar structure. This helps reduce the process difficulty, and ensure a stable relative position relationship between the waveguides.

[0013] Optionally, the plurality of amplitude comparison waveguides are disposed outside the outer waveguide. This helps reduce impact of the amplitude comparison waveguide on signal receiving / sending performance of the service waveguide.

[0014] Optionally, a circumference structure symmetrical relative to the axis is disposed at the first end of the columnar structure, and the circumference structure encompasses the first end of the outer waveguide, the first end of the inner waveguide, and the first ends of the plurality of amplitude comparison waveguides inside the circumference structure. In this way, an equivalent beam size of the signal received by the outer waveguide is equivalent to an aperture of the circumference structure. Because the aperture of the circumference structure is greater than an aperture of the outer waveguide, an equivalent beam size of a signal received / sent by the outer waveguide is increased, a gain of the feed at a low frequency is improved, and overall performance of the antenna at the low frequency is improved. Further, this helps reduce the aperture of the outer waveguide, and reduce a distance between the first amplitude comparison waveguide and the second amplitude comparison waveguide, so that the first amplitude comparison waveguide and the second amplitude comparison waveguide receive main lobe signals in the beam, correct tracking logic is ensured, and self-tracking precision is improved.

[0015] Optionally, the circumference structure is of a hollow-column shape or a horn shape.

[0016] Optionally, the first end of the columnar structure is further provided with an annular groove symmetrical relative to the axis, and the annular groove is located between the circumference structure and the outer waveguide. The annular groove helps improve equivalence of a low-frequency beam, in other words, enables a beam width of an elevation plane to be close to a beam width of an azimuth plane.

[0017] Optionally, the dual-band feed further includes a switching network, the second ends of the plurality of amplitude comparison waveguides are connected to the self-tracking module through the switching network, and the switching network is configured to input signals transmitted in the plurality of amplitude comparison waveguides to the self-tracking module one by one. In this way, a quantity of input ports required by the self-tracking module is reduced, a quantity of radio frequency units such as a low noise amplifier (LNA for short) disposed in correspondence to the input port is reduced, and circuit complexity of the self-tracking module is reduced.

[0018] According to the invention, distances between the first ends of the plurality of amplitude comparison waveguides and the axis are less than distances between the second ends of the plurality of amplitude comparison waveguides and the axis. This helps reduce lateral defocus distances of the plurality of amplitude comparison waveguides, so that the plurality of amplitude comparison waveguides receive main lobe signals in the beam, the correct tracking logic is ensured, and the self-tracking precision is improved.

[0019] Optionally, the plurality of amplitude comparison waveguides further include a third amplitude comparison waveguide and a fourth amplitude comparison waveguide that are symmetrically disposed relative to the axis of the outer waveguide. In this way, the plurality of amplitude comparison waveguides help provide deflection information of an elevation angle and deflection information of an azimuth angle for the self-tracking module, to implement two-dimensional alignment. Optionally, a connection line between the third amplitude comparison waveguide and the fourth amplitude comparison waveguide is perpendicular to a connection line between the first amplitude comparison waveguide and the second amplitude comparison waveguide.

[0020] Optionally, the dual-band feed further includes a first ortho-mode polarization separator OMT, and the outer waveguide is configured to connect to a first radio frequency circuit through the first OMT. This helps implement dual polarization of a low-frequency signal.

[0021] Optionally, the dual-band feed further includes a second ortho-mode polarization separator OMT, and the inner waveguide is configured to connect to a second radio frequency circuit through the second OMT. This helps implement dual polarization of a high-frequency signal.

[0022] Optionally, a matching medium is further disposed between the outer waveguide and the inner waveguide, and the matching medium is used to reduce a standing-wave ratio of a low-frequency voltage.

[0023] According to a second aspect according to the invention, the invention also provides an antenna device. The antenna device may include a reflector and the dual-band feed described in any possible implementation of the first aspect.

[0024] According to a third aspect according to the invention, the invention further provides a wireless communication device. The wireless communication device may include an antenna device, and the antenna device may include the dual-band feed described in any possible implementation of the first aspect.

[0025] In the following description, features which in the above summary of the invention have been marked as "not claimed" or "according to the invention" are also hereinafter, when they are described and explained with reference to the drawings, to be understood as "not claimed" or "not part of the invention" or "according to the invention". Even if sometimes in the description of the embodiments below, features marked above "according to the invention" or "the invention" are referred to in connection with the words "can" or "may" or other expressions which contain the notion of them being "optional", it should be understood that indeed such features are considered essential to the invention as claimed and not optional.BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 shows an example of a possible structure of an antenna system; FIG. 2 shows an example of a possible structure of a wireless communication device according to an embodiment of this application; FIG. 3-1 and FIG. 3-2 separately show examples of possible structures of a dual-band feed according to embodiments of this application; FIG. 4 shows an example of a possible structure of a circumference structure 4-1 and an annular groove 4-2 in a dual-band feed according to an embodiment of this application; FIG. 5 shows an example of a possible structure of a converter 5 in a dual-band feed according to an embodiment of this application; FIG. 6 shows an example of another possible structure of a dual-band feed according to an embodiment of this application; FIG. 7-1 and FIG. 7-2 show an example of a possible structure of a switching network 7 in a dual-band feed according to an embodiment of this application; FIG. 8 shows an example of a possible structure of a first transmission arm 8-1 and a second transmission arm 8-2 in a dual-band feed according to an embodiment of this application; FIG. 9-1 shows an example of a possible structure of a first OMT in a dual-band feed according to an embodiment of this application; FIG. 9-2 shows an example of a possible structure of a second OMT in a dual-band feed according to an embodiment of this application; FIG. 10-1 and FIG. 10-2 separately show examples of possible structures of a matching medium 101 in a dual-band feed according to embodiments of this application; and FIG. 11 to FIG. 14 separately show examples of beam patterns of an antenna device according to embodiments of this application. DESCRIPTION OF EMBODIMENTS

[0027] Embodiments of this application provide a feed and a device including the feed. First, a system to which embodiments of this application are applicable is described with reference to accompanying drawings.

[0028] Embodiments of this application may be applied to a wireless communication system shown in FIG. 1. With reference to FIG. 1, the wireless communication system may include an antenna device and a peer antenna device, and the antenna device and the peer antenna device are separately disposed on poles. The peer antenna device may transmit, under control of a connected back-end system (not shown in FIG. 1), a beam (denoted as a beam 0) that carries information. In this embodiment of this application, the information carried in the beam is referred to as service information. The antenna device may receive the beam 0, and then send received signals to a connected back-end system for processing, for example, obtain, through demodulation, the service information carried in the beam. For the beam 0, in this embodiment of this application, an antenna device configured to receive the beam is referred to as the antenna device, and an antenna device configured to transmit the beam is referred to as the peer antenna device. Optionally, the antenna device shown in FIG. 1 may be further configured to transmit a beam.

[0029] Optionally, the antenna device shown in FIG. 1 may be a dual-band antenna. The dual-band antenna transmits a high-frequency signal and a low-frequency signal on a same link, and combines a large capacity of a high frequency band and a long distance of a low frequency band. In this way, the dual-band antenna provides the large capacity, and enhances a quality of service (quality of service, QoS) service protection mechanism. Optionally, the antenna device shown in FIG. 1 may be a dual-band microwave antenna, and a high-frequency signal in the beam received by the antenna device, for example, an E-band signal having a wide channel bandwidth, has features such as a large space loss, large rain attenuation, and a narrow beam. As a result, the high-frequency signal has poor anti-shake performance, and a transmission distance and stability of the high-frequency signal are limited. Consequently, operating performance of the dual-band antenna is limited. Still refer to FIG. 1. The pole may be deflected due to factors such as wind and sunlight. In this case, a maximum gain direction of the antenna device may not be aligned with the beam transmitted by the peer antenna device, causing link performance deterioration or even communication interruption or the like.

[0030] Embodiments of this application may be applied to a wireless communication device shown in FIG. 2. With reference to FIG. 2, the wireless communication device may include an antenna device, a signal processing circuit, and a self-tracking module. The antenna device may include a primary reflector, a secondary reflector, and a dual-band feed. Optionally, the antenna device shown in FIG. 2 may correspond to the antenna device shown in FIG. 1, and the signal processing circuit and the self-tracking module may correspond to the back-end system mentioned in the embodiment corresponding to FIG. 1. Optionally, the signal processing circuit may include a remote radio frequency unit (remote RF unit, RRU) or a module in the RRU, and the self-tracking module may include a control system of the antenna device.

[0031] The wireless communication device may be configured to receive a beam (for example, an uplink beam), and the beam is, for example, the beam 0 shown in FIG. 1. The primary reflector and the secondary reflector may be configured to reflect the received beam to the dual-band feed. The dual-band feed is configured to receive signals of a first frequency band and a second frequency band in the beam, where the first frequency band is higher than the second frequency band. Then, the dual-band feed inputs the signals to the signal processing circuit, so that the signal processing circuit obtains, through demodulation, service information separately carried in a signal of the first frequency band and a signal of the second frequency band. In addition, the dual-band feed inputs signals to the self-tracking module, so that the self-tracking module controls a maximum gain angle of the antenna device to be aligned with a direction of the uplink beam. For ease of description, in this embodiment of this application, the signal input by the dual-band feed to the signal processing circuit is referred to as a service signal, and the signal input by the dual-band feed to the self-tracking module is referred to as a tracking signal.

[0032] With reference to FIG. 2, optionally, the signal processing circuit may include a first signal processing module and a second signal processing module that are separately configured to process service signals of corresponding frequency bands, for example, perform processing such as down-conversion, amplification, and demodulation on the service signals of the corresponding frequency bands. The self-tracking module is configured to: receive the tracking signal, and adjust the maximum gain angle of the antenna device (or it is considered as adjusting an electrical boresight of an antenna) based on the tracking signal, so that the maximum gain angle of the antenna device is aligned with the beam.

[0033] In FIG. 2, a feedback antenna device is used as an example. Optionally, the antenna device may alternatively be a feedforward antenna device. Optionally, the antenna device provided in this embodiment of this application may not include the secondary reflector. Optionally, the antenna device may be configured to receive a beam, and may be further configured to transmit a beam.

[0034] A feed apparatus (feed for short) is a core component of an antenna device, and a structure of the feed determines operating performance of the antenna device to a large extent. Embodiments of this application provide a dual-band feed, to increase an antenna capacity, and further provide indication information for dynamically adjusting a beam direction and canceling pole deflection. This helps resolve a beam alignment problem of a large-aperture microwave antenna. Optionally, the feed provided in embodiments of this application may be used in an antenna device in a wireless communication device, and the antenna device may be configured to receive a beam. Optionally, the antenna device may be, for example, the antenna device shown in FIG. 1 or FIG. 2, and the beam may be, for example, the beam 0 shown in FIG. 1. Alternatively, optionally, the feed provided in embodiments of this application may be used in an antenna device in another wireless device, for example, used in an antenna device in a radar or a satellite system.

[0035] The following describes possible structures of the dual-band feed in embodiments of this application with reference to the accompanying drawings.

[0036] With reference to FIG. 3-1, the dual-band feed provided in embodiments of this application may include a service waveguide 1 and a plurality of amplitude comparison waveguides 2. The service waveguide 1 includes an inner waveguide 11 and an outer waveguide 12. The inner waveguide 11 is nested inside the outer waveguide 12, and the inner waveguide 11 is coaxial with the outer waveguide 12. The plurality of amplitude comparison waveguides 2 include a first amplitude comparison waveguide 21 and a second amplitude comparison waveguide 22, and the first amplitude comparison waveguide 21 and the second amplitude comparison waveguide 22 are symmetrically disposed relative to an axis 20 of the outer waveguide 12.

[0037] The inner waveguide 11 may include two ports (or ends for short). For ease of description, in embodiments of this application, a port that is of the inner waveguide 11 and that is visible in FIG. 3-1 is referred to as a first end of the inner waveguide 11, and a port that is of the inner waveguide 11 and that is invisible in FIG. 3-1 is referred to as a second end of the inner waveguide 11. The outer waveguide 12 may include two ports. Similar to the inner waveguide 11, for ease of description, in embodiments of this application, a port that is of the outer waveguide 12 and that is visible in FIG. 3-1 is referred to as a first end of the outer waveguide 12, and a port that is of the outer waveguide 12 and that is invisible in FIG. 3-1 is referred to as a second end of the outer waveguide 12. Each waveguide in the first amplitude comparison waveguide 21 and the second amplitude comparison waveguide 22 may include two ports. For ease of description, in embodiments of this application, a port that is of each waveguide in the first amplitude comparison waveguide 21 and the second amplitude comparison waveguide 22 and that is visible in FIG. 3-1 is referred to as a first end of the corresponding waveguide, and a port that is of each waveguide and that is invisible in FIG. 3-1 is referred to as a second end of the corresponding waveguide.

[0038] Optionally, the first end of the inner waveguide 11, the first end of the outer waveguide 12, a first end of the first amplitude comparison waveguide 21, and a first end of the second amplitude comparison waveguide 22 are respectively configured to receive a first signal, a second signal, a first sub-signal, and a second sub-signal in a beam. A second end of the first amplitude comparison waveguide 21 and a second end of the second amplitude comparison waveguide 22 are separately configured to connect to a self-tracking module. The self-tracking module is configured to adjust a maximum gain direction of the antenna device based on the first sub-signal and the second sub-signal, to increase a gain of the first signal and / or the second signal.

[0039] Optionally, the second end of the inner waveguide 11 and the second end of the outer waveguide 12 may be configured to connect to the signal processing circuit shown in FIG. 2. For example, the second end of the inner waveguide 11 is configured to connect to the first signal processing module shown in FIG. 2, and the second end of the outer waveguide 12 is configured to connect to the second signal processing module shown in FIG. 2. Because an aperture of the outer waveguide 22 is greater than an aperture of the inner waveguide 21, a frequency band (referred to as a second frequency band) corresponding to the second signal is lower than a frequency band (referred to as a first frequency band) corresponding to the first signal. Optionally, the first frequency band may be an E-band microwave frequency band, and the second frequency band may be a common frequency band (for example, 6 GHz to 42 GHz).

[0040] Because the outer waveguide and the inner waveguide are coaxial, a maximum gain direction corresponding to the first signal is consistent with a maximum gain direction corresponding to the second signal. In addition, because a main beam in a beam pattern is usually symmetrical relative to a beam direction (the maximum gain direction corresponding to a maximum gain), and the first amplitude comparison waveguide and the second amplitude comparison waveguide are symmetrically disposed relative to the axis of the outer waveguide, when the antenna device is aligned with the maximum gain direction, gains of signals received by the first amplitude comparison waveguide and the second amplitude comparison waveguide are the same. A dual-reflector antenna is used as an example. When the beam is biased toward the first amplitude comparison waveguide, a gain of the first sub-signal is less than a gain of the second sub-signal. When the beam is biased toward the second amplitude comparison waveguide, the gain of the second sub-signal is less than the gain of the first sub-signal. Therefore, the first sub-signal and the second sub-signal may be used to determine a difference between a current maximum gain direction of the antenna device and maximum gain directions corresponding to the first signal and the second signal. In this way, the self-tracking module may compare amplitudes or power of a signal input by the first amplitude comparison waveguide 21 and a signal input by the second amplitude comparison waveguide 22, to adjust the maximum gain direction of the antenna device to increase gains of the first signal and the second signal. This helps improve receiving performance of the antenna device, and improve anti-shake performance of the antenna device. When the beam carries communication information, uplink performance is ensured.

[0041] In addition, service signals are provided by receiving signals in the beam through the service waveguide 1, and tracking signals are provided by receiving signals in the beam through the plurality of amplitude comparison waveguides 2 other than the service waveguide 1. Therefore, the second end of the inner waveguide 11 or the second end of the outer waveguide 12 does not need to be connected to a feeding network used to extract a common-mode signal and a differential-mode signal from corresponding received signals. This helps reduce process complexity, and therefore reduce processing difficulty and costs.

[0042] Optionally, the plurality of amplitude comparison waveguides 2 in the dual-band feed in this application may include more amplitude comparison feeders than the first amplitude comparison feeder 21 and the second amplitude comparison feeder. Similar to the first amplitude comparison feeder 21, each amplitude comparison feeder in the more amplitude comparison feeders may include two ports. In embodiments of this application, a port that is of each amplitude comparison feeder in the more amplitude comparison feeders and that is configured to receive a signal in the beam is referred to as a first end of the corresponding waveguide, and a port that is of each amplitude comparison feeder and that is configured to connect to the self-tracking module is referred to as a second end of the corresponding waveguide. In embodiments of this application, a signal input by the second end of the first amplitude comparison feeder 21, the second end of the second amplitude comparison feeder 22, and the second end of each of the more amplitude comparison feeders to the self-tracking module is referred to as a third signal. The self-tracking module may adjust the maximum gain direction of the antenna device based on the third signal, to increase the gain of the first signal and / or the second signal. In this case, the third signal includes the first sub-signal and the second sub-signal.

[0043] FIG. 3-2 shows an example of another possible structure of the dual-band feed according to this application. The dual-band feed shown in FIG. 3-2 includes a service waveguide 1 and a plurality of amplitude comparison waveguides 2. The service waveguide 1 shown in FIG. 3-2 may be understood with reference to the service waveguide 1 shown in FIG. 3-1. Details are not described herein again. Different from FIG. 3-1, in addition to the first amplitude comparison feeder 21 and the second amplitude comparison feeder 22, the plurality of amplitude comparison feeders 2 shown in FIG. 3-2 may further include a third amplitude comparison feeder 23 and a fourth amplitude comparison feeder 24. Similar to the first amplitude comparison feeder 21, each amplitude comparison feeder in the third amplitude comparison feeder 23 and the fourth amplitude comparison feeder 24 may include two ports. For ease of description, in embodiments of this application, a port that is of each amplitude comparison feeder in the third amplitude comparison feeder 23 and the fourth amplitude comparison feeder 24 and that is visible in FIG. 3-2 is referred to as a first end of the corresponding waveguide, and a port that is of each amplitude comparison feeder and that is invisible in FIG. 3-2 is referred to as a second end of the corresponding waveguide. A first end of the third amplitude comparison feeder 23 and a first end of the fourth amplitude comparison feeder 24 may be respectively configured to receive a third sub-signal and a fourth sub-signal in the beam. A second end of the third amplitude comparison feeder 23 and a second end of the fourth amplitude comparison feeder 24 may be respectively configured to connect to the self-tracking module. The self-tracking module may be configured to adjust the maximum gain direction of the antenna device based on the first sub-signal, the second sub-signal, the third sub-signal, and the fourth sub-signal, to increase the gains of the first signal and the second signal.

[0044] Because the third amplitude comparison waveguide 23 and the fourth amplitude comparison waveguide 24 are symmetrically disposed relative to the axis 20 of the outer waveguide, when the antenna device is aligned with the maximum gain direction, gains of signals received by the third amplitude comparison waveguide and the fourth amplitude comparison waveguide are the same. Therefore, the self-tracking module may be configured to adjust the maximum gain direction of the antenna device based on the third sub-signal and the fourth sub-signal, to increase the gains of the first signal and the second signal.

[0045] Optionally, a connection line between the first amplitude comparison waveguide 21 and the second amplitude comparison waveguide 22 is perpendicular to a connection line between the third amplitude comparison waveguide 23 and the fourth amplitude comparison waveguide 24. In this way, the self-tracking module may perform two-dimensional adjustment on the maximum gain direction of the antenna device based on the first sub-signal, the second sub-signal, the third sub-signal, and the fourth sub-signal. For example, the self-tracking module may adjust an elevation angle of the antenna device based on the first sub-signal and the second sub-signal, and adjust an azimuth angle of the antenna device based on the third sub-signal and the fourth sub-signal. Alternatively, the self-tracking module may adjust an azimuth angle of the antenna device based on the first sub-signal and the second sub-signal, and adjust an elevation angle of the antenna device based on the third sub-signal and the fourth sub-signal.

[0046] In the dual-band feed shown in FIG. 3-1 or FIG. 3-2, the service waveguide 1 and the plurality of amplitude comparison waveguides 2 are sequentially nested in a columnar structure 3 from inside to outside, so that assembly is simple, and processing costs of the dual-band feed are reduced.

[0047] In FIG. 3-1 and FIG. 3-2, that the outer waveguide 12 and the inner waveguide 11 are circular waveguides is used as an example. Optionally, the outer waveguide 12 may be a waveguide of another shape, for example, may be a rectangular waveguide; and / or the inner waveguide 11 may be a waveguide of another shape, for example, may be a rectangular waveguide.

[0048] In FIG. 3-1 and FIG. 3-2, that the plurality of amplitude comparison waveguides 2 are rectangular waveguides is used as an example. Optionally, some or all of the plurality of amplitude comparison waveguides 2 may be waveguides of another shape, for example, may be circular waveguides.

[0049] A material of the service waveguide 1 and / or a material of the plurality of amplitude comparison waveguides 2 are / is not limited in embodiments of this application. Optionally, the service waveguide 1 may alternatively be a metal feeder, and / or the plurality of amplitude comparison waveguides 2 may alternatively be metal feeders.

[0050] In FIG. 3-1 and FIG. 3-2, the outer waveguide 12, the inner waveguide 11, and the plurality of amplitude comparison waveguides 2 separately penetrate two ends of the columnar structure 3. For ease of description, in embodiments of this application, a port that is of the columnar structure 3 and that is visible in FIG. 3-1 or FIG. 3-2 is referred to as a first end of the columnar structure 3, and a port that is of the columnar structure 3 and that is invisible in FIG. 3-1 or FIG. 3-2 is referred to as a second end of the columnar structure 3. The first end of the outer waveguide 12, the first end of the inner waveguide 11, and a first end of each of the plurality of amplitude comparison waveguides 2 may face a same end of the columnar structure 3, for example, face the first end of the columnar structure 3.

[0051] Optionally, a frequency band of a signal received by each of the plurality of amplitude comparison waveguides 2 may be equivalent to the frequency band of the second signal received by the outer waveguide 12. For example, a frequency band of any sub-signal in the third signal is the second frequency band. Alternatively, optionally, a frequency band of a signal received by each of the plurality of amplitude comparison waveguides 2 may be equivalent to the frequency band of the first signal received by the inner waveguide 11. For example, a frequency band of any sub-signal in the third signal is the first frequency band. Alternatively, optionally, frequency bands of signals received by some amplitude comparison waveguides in the plurality of amplitude comparison waveguides 2 are the first frequency band, and frequency bands of signals received by some amplitude comparison waveguides are the second frequency band.

[0052] In FIG. 3-1 and FIG. 3-2, the plurality of amplitude comparison waveguides 2 are disposed outside the outer waveguide 12. Alternatively, optionally, the plurality of amplitude comparison waveguides 2 may be disposed between an inner wall of the outer waveguide 12 and an outer wall of the inner waveguide 11. Alternatively, optionally, in the plurality of amplitude comparison waveguides 2, some amplitude comparison waveguides are disposed outside the outer waveguide 12, and some amplitude comparison waveguides are disposed between the outer waveguide 12 and the inner waveguide 11.

[0053] To enable the plurality of amplitude comparison waveguides 2 to receive main lobe signals in the beam and improve the gain of the first signal and / or the second signal, in a process of processing the dual-band feed, a distance between amplitude comparison waveguides disposed on opposite sides may be reduced as much as possible, and a beam size corresponding to signals received by the service waveguide 1 needs to be increased as much as possible. The amplitude comparison waveguides disposed on opposite sides may be, for example, the first amplitude comparison feeder 21 and the second amplitude comparison feeder 22 shown in FIG. 3-2, and / or the third amplitude comparison feeder 23 and the fourth amplitude comparison feeder 24 shown in FIG. 3-2.

[0054] FIG. 4 shows an example of a local structure in another embodiment of the dual-band feed according to this application. To increase the beam size corresponding to the signals received by the service waveguide 1, optionally, with reference to FIG. 4, a circumference structure 4-1 that is symmetrical relative to the axis 20 of the outer waveguide may be disposed at the first end of the columnar structure 3, and the circumference structure 4-1 encompasses the first end of the outer waveguide 12, the first end of the inner waveguide 11, and the first end of each of the plurality of amplitude comparison waveguides 2 inside the circumference structure.

[0055] The circumference structure 4-1 is configured to increase an equivalent beam size of a signal received / sent by the outer waveguide, improve a gain of the feed at a low frequency, and improve overall performance of the antenna at the low frequency. In this way, even if the aperture of the outer waveguide is reduced, and the distance between the amplitude comparison waveguides disposed on opposite sides in the plurality of amplitude comparison waveguides 2 is reduced, this still helps the plurality of amplitude comparison waveguides 2 receive the main lobe signals in the beam, ensure correct tracking logic, and improve self-tracking precision.

[0056] In FIG. 4, that the circumference structure 4-1 is of a hollow-column shape is used as an example. Optionally, the circumference structure may be of another shape, for example, may be of a horn shape. In FIG. 4, a cross section of the circumference structure 4-1 on a plane perpendicular to the axis 20 is a circle. Optionally, the cross section of the circumference structure 4-1 on the plane may alternatively be of another shape, for example, a square.

[0057] In FIG. 4, that the plurality of amplitude comparison waveguides 2 include four amplitude comparison waveguides is used as an example. Optionally, the plurality of amplitude comparison waveguides may include more or fewer amplitude comparison waveguides, for example, the two amplitude comparison waveguides shown in FIG. 3-1.

[0058] Optionally, still refer to FIG. 4. The first end of the columnar structure 3 may be further provided with an annular groove 4-2 symmetrical relative to the axis 20, and the annular groove 4-2 is located between the circumference structure 4-1 and the outer waveguide 12. The annular groove 4-2 may be used to improve beam equivalence, for example, enable a width of a beam of the second frequency band on an elevation plane to be close to a width of the beam on an azimuth plane.

[0059] If the plurality of amplitude comparison waveguides 2 are disposed outside the outer waveguide 12, to reduce the distance between the amplitude comparison waveguides disposed on opposite sides, and adjust a maximum direction of a beam received by the plurality of amplitude comparison waveguides 2 to be close to a center of the service waveguide 1, a distance between each of the plurality of amplitude comparison waveguides 2 and an outer wall of the outer waveguide 12 needs to be reduced as much as possible. However, because lengths of the service waveguide 1 and the plurality of amplitude comparison waveguides 2 are usually long, in a process of disposing the service waveguide 1 and the plurality of amplitude comparison waveguides 2 in the columnar structure 3 in a penetrating manner, the processing difficulty is increased when disposing the plurality of amplitude comparison waveguides 2 close to the outer wall of the outer waveguide 12. Optionally, a distance between a first end of any amplitude comparison waveguide in the plurality of amplitude comparison waveguides 2 and the axis 20 is less than a distance between a second end of the corresponding amplitude comparison waveguide in the plurality of amplitude comparison waveguides and the axis. This helps reduce the distance between each of the plurality of amplitude comparison waveguides 2 and the outer wall of the outer waveguide. The first amplitude comparison waveguide 21 is used as an example. A distance between the second end of the first amplitude comparison waveguide 21 and the axis 20 is less than a distance between the first end of the first amplitude comparison waveguide 21 and the axis 20. In this way, only the distance between the first end of the first amplitude comparison waveguide 21 and the axis 20 needs to be reduced, and this helps reduce process difficulty.

[0060] Optionally, the columnar structure 4 may include two columnar substructures, and the plurality of amplitude comparison waveguides 2 and the service waveguide 1 sequentially penetrate the two columnar substructures. For example, the plurality of amplitude comparison waveguides 2 include four amplitude comparison waveguides. In one columnar substructure (referred to as a primary columnar structure) in the two columnar substructures, any one of the plurality of amplitude comparison waveguides 2 is disposed in parallel with the axis 20, and a distance between the amplitude comparison waveguide and the axis is assumed as d1. The other columnar substructure (referred to as a converter) in the two columnar substructures may be shown, for example, in FIG. 5. With reference to FIG. 5, the converter 5 includes a via 51 corresponding to the outer waveguide 12, and further includes vias 52 corresponding to the plurality of amplitude comparison waveguides 2. For ease of description, in embodiments of this application, an end that is of the converter 5 or any via in the converter 5 and that is visible in FIG. 5 is referred to as a first end of the corresponding structure, and an end that is of the converter 5 or any via in the converter 5 and that is invisible in FIG. 5 is referred to as a second end of the corresponding structure. For any one of the vias 52, a distance between a first end of the via and the axis 20 is less than a distance between a second end of the via and the axis 20. It is assumed that FIG. 5 shows a via 521 of the first amplitude comparison waveguide 21, a via 522 of the second amplitude comparison waveguide 22, and a via 523 of the third amplitude comparison waveguide 23. The via 521 is used as an example. It is assumed that a distance between a first end of the via 521 and the axis 20 may be d2, and a distance between a second end of the via 521 and the axis 20 is d1, where d2 is less than d1. A second end of the primary columnar structure is configured to connect to the back-end system described above, a first end of the primary columnar structure is connected to a second end of the converter 5 in a matched manner, the service waveguide 1 receives the first signal and the second signal through a first end of the via 51, and the plurality of amplitude comparison waveguides 2 receive the third signal through the vias 52. Because d2 is less than d1, the distance between the amplitude comparison waveguides disposed on opposite sides is reduced, and the process difficulty is reduced.

[0061] Optionally, with reference to FIG. 6, the dual-band feed provided in embodiments of this application may further include a back-end structure 6, and the service waveguide 1 and / or the plurality of amplitude comparison waveguides 2 may be connected to the back-end system through the back-end structure 6. For example, the inner waveguide 11 may be connected to a first signal processing module through the back-end structure 6, and / or the outer waveguide 12 may be connected to a second signal processing module through the back-end structure, and / or the plurality of amplitude comparison waveguides 2 may be connected to each other through the back-end structure 6.

[0062] Optionally, with reference to FIG. 7-1 and FIG. 7-2, a switching network 7 may be disposed inside the back-end structure 6. The second end of each of the plurality of amplitude comparison waveguides 2 may be connected to the self-tracking module through the switching network 7. The switching network 7 is configured to input signals transmitted by the plurality of amplitude comparison waveguides 2 to the self-tracking module one by one. In this way, the self-tracking module can receive the signals from the plurality of amplitude comparison waveguides 2 with only one port, and this helps reduce circuit complexity of the self-tracking module.

[0063] FIG. 7-1 is intended to describe the switching network 7 connected to the plurality of amplitude comparison waveguides 2. Therefore, details of the service waveguide 1 are not specifically shown. For a specific structure of the service waveguide 1 in FIG. 7-1, refer to any one of the foregoing embodiments.

[0064] The switching network 7 may include a plurality of channels corresponding to the plurality of amplitude comparison waveguides 2, and the plurality of channels are turned on or off under control of a switching component. For example, the plurality of amplitude comparison waveguides 2 include the first amplitude comparison waveguide 21, the second amplitude comparison waveguide 22, the third amplitude comparison waveguide 23, and the fourth amplitude comparison waveguide 24. Still refer to FIG. 7-1. The switching network 7 includes an input channel 71, an input channel 72, an input channel 73, and an input channel 74, further includes an output channel 75, an output channel 76, and an output channel 77, and may further include the switching component. The switching component may include a switch 78-1, a switch 78-2, and a switch 78-3. After entering the input channel 71 through the second end of the first amplitude comparison waveguide 21, the first sub-signal received by the first end of the first amplitude comparison waveguide 21 enters the output channel 75 through the switch 78-1, and then enters the output channel 77 through the switch 78-3. After entering the input channel 72 through the second end of the second amplitude comparison waveguide 21, the second sub-signal received by the first end of the second amplitude comparison waveguide 22 enters the output channel 76 through the switch 78-2, and then enters the output channel 77 through the switch 78-3. By analogy, the third sub-signal received by the third amplitude comparison waveguide 23 enters the output channel 77 sequentially through the input channel 73, the switch 78-1, the output channel 75, and the switch 78-3, and the fourth sub-signal received by the fourth amplitude comparison waveguide 24 enters the output channel 77 sequentially through the input channel 74, the switch 78-2, the output channel 76, and the switch 78-3. The output channel 77 is configured to input received signals to the self-tracking module. An implementation of the switching component is not limited in embodiments of this application. Optionally, any switch in the switching component may be a ferrite switch, a radio frequency micro-electro-mechanical system (micro-electro-mechanical system, MEMS) switch, or the like.

[0065] Processing the switching network 7 inside the back-end structure 6 is merely a process implementation. In embodiments of this application, the switching network 7 is not limited to being disposed inside the back-end structure 6, and a shape of the back-end structure 6 is not limited in embodiments of this application.

[0066] Optionally, a plurality of transmission arms may be disposed inside the back-end structure 6, and the plurality of amplitude comparison waveguides 2 may be connected to the self-tracking module through a corresponding quantity of transmission arms. For example, the plurality of amplitude comparison waveguides 2 include the first amplitude comparison waveguide 21 and the second amplitude comparison waveguide 22. With reference to FIG. 8, the back-end structure 6 may include a first transmission arm 8-1 and a second transmission arm 8-2. Refer to FIG. 8. The second end of the first amplitude comparison waveguide 21 may be connected to one end of the first transmission arm 8-1, and the other end of the first transmission arm 8-1 is configured to connect to the self-tracking module, to input the signal in the first amplitude comparison waveguide 21 into the self-tracking module. Still refer to FIG. 8. The second end of the second amplitude comparison waveguide 22 may be connected to one end of the second transmission arm 8-2, and the other end of the second transmission arm 8-2 is configured to connect to the self-tracking module, to input the signal in the second amplitude comparison waveguide 22 into the self-tracking module.

[0067] FIG. 8 is intended to describe the plurality of transmission arms connected to the plurality of amplitude comparison waveguides 2. Therefore, details of the service waveguide 1 are not specifically shown. For a specific structure of the service waveguide 1 in FIG. 8, refer to any one of the foregoing embodiments.

[0068] Processing the plurality of transmission arms inside the back-end structure 6 is merely a process implementation. In embodiments of this application, the plurality of transmission arms are not limited to being disposed inside the back-end structure 6, and a shape of the back-end structure 6 is not limited in embodiments of this application.

[0069] FIG. 9-1 shows an example of a local structure in another embodiment of the dual-band feed according to this application. Optionally, with reference to FIG. 9-1, an ortho-mode transducer (Ortho-Mode Transducer, OMT) 9-1 (referred to as a first OMT) connected to the second end of the outer waveguide 12 may be disposed inside the back-end structure 6, and the outer waveguide 12 may be connected to the second signal processing module through the OMT 9-1. This helps implement dual polarization of the second frequency band (or referred to as a low-frequency signal).

[0070] Processing the first OMT inside the back-end structure 6 is merely a process implementation. In embodiments of this application, the first OMT is not limited to being disposed inside the back-end structure 6, and a shape of the back-end structure 6 is not limited in embodiments of this application.

[0071] FIG. 9-2 shows an example of a local structure in another embodiment of the dual-band feed according to this application. Optionally, with reference to FIG. 9-2, an OMT 9-2 (referred to as a second OMT) connected to the second end of the inner waveguide 11 may be disposed inside the back-end structure 6, and the inner waveguide 11 may be connected to the first signal processing module through the OMT 9-2. This helps implement dual polarization of the first frequency band (or referred to as a high-frequency signal).

[0072] Processing the second OMT inside the back-end structure 6 is merely a process implementation. In embodiments of this application, the second OMT is not limited to being disposed inside the back-end structure 6, and a shape of the back-end structure 6 is not limited in embodiments of this application.

[0073] Optionally, with reference to FIG. 10-1 and FIG. 10-2, a matching medium 101 may be further disposed between the outer waveguide 12 and the inner waveguide 11, and the matching medium 101 is used to reduce a standing-wave ratio of a low-frequency voltage. The matching medium 101 shown in FIG. 10-1 and FIG. 10-2 is merely used as an example, and a specific shape of the matching medium 101 is not limited in this application.

[0074] In embodiments of this application, it is not limited that the service waveguide 1 and the plurality of amplitude comparison waveguides 2 are nested in the cylindrical columnar structure 3 shown in FIG. 3-1 or FIG. 3-2. Optionally, the service waveguide 1 and the plurality of amplitude comparison waveguides 2 may be nested in a columnar structure of another shape. Alternatively, the service waveguide 1 and the plurality of amplitude comparison waveguides 2 may not be disposed in a columnar structure, but the plurality of amplitude comparison waveguides 2 may be attached on an outer surface of the outer waveguide 12.

[0075] It should be noted that, in FIG. 1 and FIG. 2, that the dual-band feed provided in embodiments of this application is applied to a wireless communication system is used as an example. The dual-band feed provided in embodiments of this application may alternatively be applied to a system other than the wireless communication system, for example, applied to a satellite system or a radar system.

[0076] An embodiment of this application further provides an antenna device. The antenna device may include the dual-band feed described in any one of the foregoing embodiments. Optionally, the antenna device may be, for example, the antenna device shown in FIG. 1 or FIG. 2. In FIG. 2, a feedback antenna device is used as an example. Optionally, the antenna device may alternatively be a feedforward antenna device. Optionally, the antenna device provided in this embodiment of this application may not include a secondary reflector. Optionally, the antenna device may be configured to receive a beam, and may be further configured to transmit a beam.

[0077] An embodiment of this application further provides a wireless device. The wireless device may include the foregoing antenna device. Optionally, the wireless device may be a wireless communication device. For example, the wireless device may be, for example, the wireless communication device shown in FIG. 2.

[0078] After the plurality of amplitude comparison waveguides 2 in the dual-band feed provided in embodiments of this application are connected to the self-tracking module, the self-tracking module may adjust, based on the signals input by the plurality of amplitude comparison waveguides 2, a maximum gain angle of the antenna device in which the dual-band feed is located, to enable the maximum gain angle of the antenna device to be aligned with an uplink beam direction, and therefore increase the gains of the first signal and the second signal. A manner in which the self-tracking module adjusts the antenna device is not limited in embodiments of this application. Optionally, the self-tracking module may adjust the maximum gain angle of the antenna device by adjusting the secondary reflector of the antenna device.

[0079] To verify performance of the antenna device provided in embodiments of this application, the following describes performance of the antenna device manufactured according to the solutions in embodiments of this application. The inner waveguide 11 and the outer waveguide 12 of the antenna device are respectively processed to receive 80 GHz and 15 GHz wireless signals, and the plurality of amplitude comparison waveguides 2 are disposed outside the outer waveguide 12.

[0080] FIG. 11 shows beam patterns of 15 GHz signals received by the outer waveguide 12 of the antenna device. In FIG. 11, a horizontal coordinate represents a pattern angle, and a vertical coordinate represents a pattern gain. A curve 11-1 (marked with a black triangle in FIG. 11), a curve 11-2 (marked with a black circle in FIG. 11), a curve 11-3 (marked with a white triangle in FIG. 11), and a curve 11-4 (marked with a white circle in FIG. 11) respectively represent 15 GHz traffic beam patterns obtained through testing when the secondary reflector of the antenna device rotates by 0°, 5°, 10°, and 18°. Maximum gains in the curve 11-1 to the curve 11-4 are respectively obtained at 0°, 0.34°, 0.74°, and 1.45°. In other words, through rotation of the secondary reflector from 0° to 18°, coverage of the antenna device for a 15 GHz beam can basically reach 0° to 1.5°, and a gain decrease does not exceed 1.6 dB. In other words, when the maximum gain direction of the antenna device deviates from the 15 GHz beam by 1.5°, through rotation of the secondary reflector by 18°, the maximum gain direction of the antenna device may be aligned with the 15 GHz beam, and the gain decrease does not exceed 1.6 dB.

[0081] FIG. 12 separately shows beam patterns of 15 GHz signals received by the outer waveguide 12 and the plurality of amplitude comparison waveguides 2 of the antenna device when the secondary reflector rotates by 5°. In FIG. 12, a horizontal coordinate represents a pattern angle, and a vertical coordinate represents a pattern gain. A curve 12-1 (marked with a black triangle in FIG. 12), a curve 12-2 (marked with a black circle in FIG. 12), and a curve 12-3 (marked with a white triangle in FIG. 12) respectively represent beam patterns of signals received by the first amplitude comparison waveguide 21, the outer waveguide 12, and the second amplitude comparison waveguide 22 of the antenna device. A maximum gain of the curve 12-2 is obtained at 0.34°, and an intersection point of the curve 12-1 and the curve 12-3 is at 0.36°. It can be learned that a pattern angle corresponding to the intersection point of the curve 12-1 and the curve 12-3 basically overlaps a pattern angle corresponding to a maximum gain point of the curve 12-2. When the secondary reflector is at another angle, a pattern angle corresponding to an intersection point of the curve 12-1 and the curve 12-3 also basically overlaps a pattern angle corresponding to a maximum gain point of the curve 12-2. In other words, in a process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is equal to the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that a gain of the second signal received by the outer waveguide 12 corresponds to a maximum gain of a beam, in other words, the maximum gain direction of the antenna device is aligned with the 15 GHz beam. In the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is less than the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that the maximum gain direction of the antenna device deviates from the 15 GHz beam in a direction toward the first amplitude comparison waveguide 21. In the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is greater than the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that the maximum gain direction of the antenna device deviates from the 15 GHz beam in a direction toward the second amplitude comparison waveguide 21. It can be learned that the antenna device provided in embodiments of this application helps implement self-tracking alignment of a low-frequency beam.

[0082] FIG. 13 shows beam patterns of 80 GHz signals received by the inner waveguide 11 of the antenna device. In FIG. 13, a horizontal coordinate represents a pattern angle, and a vertical coordinate represents a pattern gain. A curve 13-1 (marked with a black triangle in FIG. 13), a curve 13-2 (marked with a black circle in FIG. 13), a curve 13-3 (marked with a white triangle in FIG. 13), and a curve 13-4 (marked with a white circle in FIG. 13) respectively represent 80 GHz traffic beam patterns obtained through testing when the secondary reflector of the antenna device rotates by 0°, 5°, 10°, and 18°. Maximum gains in the curve 13-1 to the curve 13-4 are respectively obtained at 0°, 0.38°, 0.77°, and 1.24°. In other words, through rotation of the secondary reflector from 0° to 18°, coverage of the antenna device for an 80 GHz beam can basically reach 0° to 1.5°, and a gain decrease does not exceed 8 dB. In other words, when the maximum gain direction of the antenna device deviates from the 80 GHz beam by 1.5°, through rotation of the secondary reflector by 18°, the maximum gain direction of the antenna device may be aligned with the 80 GHz beam, and the gain decrease does not exceed 8 dB.

[0083] FIG. 14 separately shows beam patterns of 80 GHz signals received by the inner waveguide 11 and the plurality of amplitude comparison waveguides 2 of the antenna device when the secondary reflector rotates by 5°. In FIG. 14, a horizontal coordinate represents a pattern angle, and a vertical coordinate represents a pattern gain. A curve 14-1 (marked with a black triangle in FIG. 14), a curve 14-2 (marked with a black circle in FIG. 14), and a curve 14-3 (marked with a white triangle in FIG. 14) respectively represent beam patterns of signals received by the first amplitude comparison waveguide 21, the inner waveguide 11, and the second amplitude comparison waveguide 22 of the antenna device. A maximum gain of the curve 14-2 is obtained at 0.38°, and an intersection point of the curve 14-1 and the curve 14-3 is at 0.36°. It can be learned that a pattern angle corresponding to the intersection point of the curve 14-1 and the curve 14-3 basically overlaps a pattern angle corresponding to a maximum gain point of the curve 14-2. When the secondary reflector is at another angle, a pattern angle corresponding to an intersection point of the curve 14-1 and the curve 14-3 also basically overlaps a pattern angle corresponding to a maximum gain point of the curve 14-2. In other words, in a process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is equal to the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that a gain of the first signal received by the inner waveguide 11 corresponds to a maximum gain of a beam, in other words, the maximum gain direction of the antenna device is aligned with the 80 GHz beam. In the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is less than the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that the maximum gain direction of the antenna device deviates from the 80 GHz beam in a direction toward the first amplitude comparison waveguide 21. In the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is greater than the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that the maximum gain direction of the antenna device deviates from the 80 GHz beam in a direction toward the second amplitude comparison waveguide 21. It can be learned that the antenna device provided in embodiments of this application helps implement self-tracking alignment of a high-frequency beam.

[0084] It can be learned from FIG. 11 to FIG. 14 that, in the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is equal to the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that both the gain of the second signal received by the outer waveguide 12 and the gain of the first signal received by the inner waveguide 11 correspond to maximum gains of beams, in other words, the maximum gain direction of the antenna device is aligned with both the 15 GHz beam and the 80 GHz beam. In the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is less than the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that the maximum gain direction of the antenna device deviates from the 15 GHz beam and the 80 GHz beam in the direction toward the first amplitude comparison waveguide 21. In the process of rotating the secondary reflector, if the gain of the first sub-signal received by the first amplitude comparison waveguide 21 is greater than the gain of the second sub-signal received by the second amplitude comparison waveguide 22, it may be considered that the maximum gain direction of the antenna device deviates from the 15 GHz beam and the 80 GHz beam in the direction toward the second amplitude comparison waveguide 21. It can be learned that the antenna device provided in embodiments of this application helps implement self-tracking alignment of both the high-frequency beam and the low-frequency beam.

[0085] The term "and / or" in this application may be an association relationship for describing associated objects, and may indicate three relationships. For example, A and / or B may indicate the following cases: Only A exists, both A and B exist, and only B exists, where A and B may be singular or plural. In addition, the character " / " in this application generally indicates an "or" relationship between the associated objects. "A plurality of" in this application refers to two or more than two.

[0086] In the specification, claims, and accompanying drawings of this application, the terms "first", "second", and the like are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence. It should be understood that the terms used in such a way are interchangeable in proper circumstances, which is merely a discrimination manner that is used when objects having a same attribute are described in embodiments of this application. In addition, the terms "include", "contain" and any other variants thereof mean to cover the non-exclusive inclusion, so that a process, method, system, product, or device that includes a series of units is not necessarily limited to those units, but may include other units not expressly listed or inherent to such a process, method, product, or device.

[0087] The technical solutions provided in this application are described in detail above. The principle and implementations of this application are described in this application by using specific examples. The descriptions of embodiments are merely provided to help understand the method and core ideas of this application. The scope of protection of this application is solely defined by the appended claims.

Claims

1. A dual-band feed, for use in an antenna device, wherein the antenna device is configured to receive a beam (0), the dual-band feed comprises a service waveguide (1) and a plurality of amplitude comparison waveguides (2), the service waveguide (1) comprises an outer waveguide (12, 22) and an inner waveguide (11, 21) that is nested inside the outer waveguide (12, 22) and that is coaxial with the outer waveguide (12, 22), and the plurality of amplitude comparison waveguides (2) comprise a first amplitude comparison waveguide (21) and a second amplitude comparison waveguide (21, 22) that are symmetrically disposed relative to an axis (20) of the outer waveguide (12, 22); and a first end of the inner waveguide (11, 21), a first end of the outer waveguide (12, 22), and first ends of the plurality of amplitude comparison waveguides (2) are respectively configured to receive a first signal, a second signal, and a third signal in the beam (0), second ends of the plurality of amplitude comparison waveguides (2) are configured to connect to a self-tracking module, and the self-tracking module is configured to adjust a maximum gain direction of the antenna device based on the third signal to increase a gain of the first signal and / or the second signal; wherein distances between the first ends of the plurality of amplitude comparison waveguides (2) and the axis (20) are less than distances between the second ends of the plurality of amplitude comparison waveguides (2) and the axis (20).

2. The dual-band feed according to claim 1, further comprising a columnar structure (3, 4), the outer waveguide (12, 22), the inner waveguide (11, 21), and the plurality of amplitude comparison waveguides (2) separately penetrate two ends of the columnar structure (3, 4), and the first end of the outer waveguide (12, 22), the first end of the inner waveguide (11, 21), and a first end of each amplitude comparison waveguide face a first end of the columnar structure (3, 4).

3. The dual-band feed according to claim 2, wherein the plurality of amplitude comparison waveguides (2) are disposed outside the outer waveguide (12, 22).

4. The dual-band feed according to claim 3, wherein a circumference structure (1, 4) symmetrical relative to the axis (20) is disposed at the first end of the columnar structure (3, 4), and the circumference structure (1, 4) encompasses the first end of the outer waveguide (12, 22), the first end of the inner waveguide (11, 21), and the first ends of the plurality of amplitude comparison waveguides (2) inside the circumference structure (1, 4).

5. The dual-band feed according to claim 4, wherein the circumference structure (1, 4) is of a hollow-column shape or a horn shape.

6. The dual-band feed according to claim 4 or 5, wherein the first end of the columnar structure (3, 4) is further provided with an annular groove (2, 4) symmetrical relative to the axis (20), and the annular groove (2, 4) is located between the circumference structure (1, 4) and the outer waveguide (12, 22).

7. The dual-band feed according to any one of claims 1 to 6, further comprising a switching network (7), the second ends of the plurality of amplitude comparison waveguides (2) are connected to the self-tracking module through the switching network (7), and the switching network (7) is configured to input signals transmitted in the plurality of amplitude comparison waveguides (2) to the self-tracking module one by one.

8. The dual-band feed according to any one of claims 1 to 7, wherein the plurality of amplitude comparison waveguides (2) further comprise a third amplitude comparison waveguide (23) and a fourth amplitude comparison waveguide (24) that are symmetrically disposed relative to the axis (20) of the outer waveguide (12, 22).

9. The dual-band feed according to any one of claims 1 to 8, further comprising a first ortho-mode transducer, and a second end of the outer waveguide (12, 22) is connected to the first ortho-mode transducer.

10. The dual-band feed according to any one of claims 1 to 9, wherein the dual-band feed further comprises a second ortho-mode transducer, and a second end of the inner waveguide (11, 21) is connected to the second ortho-mode transducer.

11. An antenna device, comprising a reflector and the dual-band feed according to any one of claims 1 to 10.

12. A wireless communication device, comprising the antenna device according to claim 11.