CN114300851A - E-band dual-band short-focus parabolic antenna and wireless communication system - Google Patents
E-band dual-band short-focus parabolic antenna and wireless communication system Download PDFInfo
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- CN114300851A CN114300851A CN202111567413.4A CN202111567413A CN114300851A CN 114300851 A CN114300851 A CN 114300851A CN 202111567413 A CN202111567413 A CN 202111567413A CN 114300851 A CN114300851 A CN 114300851A
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Abstract
The invention relates to the technical field of antennas, in particular to an E-band dual-band short-focus parabolic antenna and a wireless communication system, wherein the parabolic antenna comprises: the antenna comprises an antenna body and a feed radiation component, wherein the feed radiation component comprises a feed source and a feed network structure; the feed source comprises an auxiliary reflecting surface, an auxiliary reflecting surface bracket used for mounting the auxiliary reflecting surface and a coaxial circular waveguide tube arranged in the auxiliary reflecting surface bracket; the coaxial circular waveguide comprises a low-frequency band waveguide, an E-band frequency band waveguide, a choke horn, a plastic part, a plastic film and a first impedance matching part; the wireless communication system comprises an E-band dual-band short-focus parabolic antenna; the E-band dual-band short-focus parabolic antenna integrates the antenna with lower frequency and the E-band antenna on a pair of antennas, can reduce the networking cost, and can meet the requirements of long-distance reliable transmission and 5G high speed simultaneously.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an E-band dual-band short-focus parabolic antenna and a wireless communication system.
Background
With the development of wireless communication, the requirements of antenna systems are increasing day by day, and nowadays, under 5G communication, the requirements on the capacity and distance of data backhaul are increasing. The microwave antenna is a core component of a base station return system, the traditional microwave antenna with a conventional frequency band can provide stable link and long-distance transmission, but the requirement of 5G high-speed transmission cannot be met due to relatively narrow bandwidth; and the E-band (71 GHz-86 GHz) microwave antenna has a receiving and transmitting interval of 10GHz, can easily meet the requirement of 5G air interface transmission Gbps level, but has a limited transmission distance.
Therefore, there is a need for a dual-band microwave antenna that can integrate a lower frequency antenna and an E-band antenna into one antenna, and that can reduce the cost of networking, and satisfy the requirements of reliable transmission over long distances and high 5G rates.
Disclosure of Invention
The present invention is directed to an E-band dual-band short-focus parabolic antenna and a wireless communication system, which solve one or more of the problems of the prior art and provide at least one of the advantages.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides an E-band dual-band short-focus parabolic antenna, including: the antenna comprises an antenna body and a feed radiation component, wherein the feed radiation component comprises a feed source and a feed network structure;
the feed source comprises: the device comprises an auxiliary reflecting surface, an auxiliary reflecting surface bracket used for mounting the auxiliary reflecting surface and a coaxial circular waveguide tube arranged in the auxiliary reflecting surface bracket; the subreflector support is arranged at the top end of the feed network structure;
the coaxial circular waveguide includes: a low-frequency band waveguide tube, an E-band waveguide tube, a choke horn, a plastic part, a plastic film, and a first impedance matching part;
the low-frequency band waveguide tube is sleeved outside the E-band frequency band waveguide tube and is coaxial and concentric with the E-band frequency band waveguide tube;
the choke horn is sleeved at the top end of the low-frequency-band waveguide tube, and the plastic part presses the edge of the plastic film on the top end of the choke horn so that the plastic film seals the top of the low-frequency-band waveguide tube;
the first impedance matching component is provided with a central through hole along the axis, the central through hole is attached to the outer wall of the E-band frequency band waveguide tube, the outer wall of the first impedance matching component is provided with a plurality of annular components distributed in a step shape, and at least one annular component is attached to the inner wall of the low-frequency band waveguide tube;
the feed network structure is connected with the coaxial circular waveguide tube and is used for separating mutually orthogonal main modes in the low-frequency-band guided mode and transmitting the mutually orthogonal main modes of E wave bands.
As a further improvement of the above technical solution, the feed network structure includes a first polarization splitter, a second polarization splitter, a first branch and a second branch;
the second polarization separator is an orthogonal mode coupler and comprises a public end and 4 branch ends, and the 4 branch ends are in a cross structure;
the first branch includes: the waveguide structure comprises an E-surface 90-degree step-type curved waveguide, an E-surface 90-degree curved waveguide, a first one-way two-way T-shaped waveguide and a 90-degree twisted waveguide structure;
two symmetrical branch ends in the second polarization separator are respectively connected with one end of each of the two E-surface 90-degree stepped bent waveguides, the other ends of the two E-surface 90-degree stepped bent waveguides are respectively and correspondingly connected with two branch ends of the first one-by-one two-way T-shaped waveguide through the E-surface 90-degree bent waveguides, and the combining end of the first one-by-two-way T-shaped waveguide is connected with one end of the 90-degree twisted waveguide structure;
the second branch circuit includes: the waveguide comprises an H-surface 90-degree curved waveguide, an H-surface 90-degree step-type curved waveguide and a second one-to-two T-shaped waveguide;
the other two symmetrical branch ends in the second polarization separator are respectively connected with one ends of the two H-surface 90-degree bent waveguides, and the other ends of the two H-surface 90-degree bent waveguides are respectively connected with two branch ends of the second one-to-two path T-shaped waveguide in a one-to-one correspondence mode through the H-surface 90-degree stepped bent waveguides;
the other end of the 90-degree twisted waveguide structure and the combining end of the second one-to-two path T-shaped waveguide are connected with a first polarization separator together.
As the further improvement of the above technical scheme, choke horn is including opening a mouthful loudspeaker, it is equipped with a plurality of first recesses, a plurality of to open an mouthful inner wall of loudspeaker along its axis direction first recess is the echelonment and connects, and is a plurality of the internal diameter of first recess is grow in proper order along the horn mouth direction.
As a further improvement of the above technical solution, the choke horn further comprises a second impedance matching component, the second impedance matching component is provided with a circular through hole along an axis thereof, an inner wall of the circular through hole, an inner wall of the flared horn and an inner wall of the plastic component are flush at a joint, and outer walls of upper and lower ends of the second impedance matching component are respectively attached to the plastic component and the flared horn; and a second groove is formed in the outer wall of the second impedance matching component along the axis direction of the second impedance matching component, and the inner diameter of the second groove is larger than that of the first groove.
As a further improvement of the above technical solution, the feed source further includes a matching plate disposed at an outer edge of the sub-reflector, so that a primary pattern of the feed source satisfies energy distribution of a radiation spread angle at a set focal ratio by performing structural matching on a ring focal curve of the sub-reflector and the matching plate.
As a further improvement of the technical scheme, the longitudinal section of the auxiliary reflecting surface is in a horn pointed cone shape, and the matching plate comprises a step structure arranged on the outer wall of the opening of the auxiliary reflecting surface along the direction of the horn mouth.
As a further improvement of the above technical solution, the E-band dual-band short-focus parabolic antenna further includes a bracket fixing base, and the bracket fixing base is connected to the sub-reflecting surface bracket and the feed network structure.
As a further improvement of the above technical solution, the antenna body includes: the antenna comprises an antenna central disc, a short-focus reflecting surface, a wave-absorbing material and an antenna housing;
the bottom of feed radiation component is connected with the bottom of antenna center panel, the short burnt plane of reflection sets up in the top of antenna center panel, and is located the top of subreflector, wave-absorbing material set up in the surrounding edge inboard of short burnt plane of reflection, the antenna house sets up in the opening top of short burnt plane of reflection, and seals the opening of short burnt plane of reflection.
As a further improvement of the above technical solution, the antenna body further includes a clamping edge, the clamping edge has a third groove, one end of the groove bottom of the third groove extends to be disposed on the short-focus reflecting surface, and the edge of the antenna housing is nested in the notch of the third groove.
In a second aspect, an embodiment of the present invention further provides a wireless communication system, including the E-band dual-band short-focus parabolic antenna according to any one of the first aspects.
The invention has the beneficial effects that: the invention discloses an E-band dual-band short-focus parabolic antenna and a wireless communication system, which can integrate an antenna with lower frequency and the E-band antenna on a pair of antennas, reduce the networking cost and meet the requirements of long-distance reliable transmission and 5G high speed simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a partial perspective view of an E-band dual-band short-focus parabolic antenna according to an embodiment of the present invention;
FIG. 2 is a front view of the overall structure of an E-band dual-band short-focus parabolic antenna according to an embodiment of the present invention;
FIG. 3 is a partial structural front view of an E-band dual-band short-focus parabolic antenna according to an embodiment of the present invention;
FIG. 4 is a structural elevation view of a feed in an embodiment of the invention;
FIG. 5 is an elevation view of another feed in an embodiment of the invention;
FIG. 6 is a front view of a feed according to yet another embodiment of the present invention;
FIG. 7 is an enlarged schematic view of a portion a shown in FIG. 6;
fig. 8 is a schematic diagram of a first view of a feed network structure in an embodiment of the invention;
fig. 9 is a schematic diagram of a second view angle of the feed network structure in the embodiment of the invention.
Reference numerals: 100. a feed source; 110. a sub-reflecting surface; 111. a stepped structure; 120. a sub-reflector support; 130. a coaxial circular waveguide; 131. a low-band waveguide; 132. e-band frequency band waveguide tubes; 133. a choke horn; 1331. an opening horn; 101. a first groove; 1332. a second impedance matching section; 102. a second groove; 134. a plastic component; 135. a plastic film; 136. a first impedance matching section; 200. a feed network structure; 210. a first polarization separator; 220. a second polarization separator; 221. h-plane 90-degree step-type curved waveguide; 222. a 90 DEG twisted waveguide structure; 223. e surface 90 degree step type curved waveguide; 224. e-plane 90-degree bend waveguide; 225. h-plane 90-degree bend waveguide; 226. the first one-way two-way T-shaped waveguide; 227. the second one-to-two path T-shaped waveguide; 300. a bracket fixing seat; 410. an antenna center plate; 420. a short-focus reflecting surface; 430. a wave-absorbing material; 440. an antenna cover; 450. and (7) edge clamping.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The inventor finds that a dual-frequency antenna product in the related technology is basically developed and produced based on a long focal length (the focal diameter ratio is more than 0.25) due to the bottleneck of feed source radiation forming, and the product has a large longitudinal size and high cost; moreover, the high surrounding edge needs to be assembled for use structurally, and in process assembly, the precision of the reflecting surface is damaged due to the fact that the reflecting surface is prone to being pulled and deformed by the surrounding edge due to machining errors, and the product performance is poor; meanwhile, the wave-absorbing material is required to be attached to the surrounding edge due to performance requirements, and the wave-absorbing material is more in consumption and more in cost due to the structural characteristic of the high surrounding edge.
For example, the E-band dual-band parabolic antenna disclosed in patent document CN214313516U, cannot solve the problems of large product size, high cost, potential performance hazard, etc. caused by the high surrounding edge structure. The patent document with the patent number CN210866445U discloses a dual-frequency dual-polarization splitter, which uses an H-plane 90 ° waveguide and an E-plane 90 ° waveguide at the longitudinal waveguide turn, which is not beneficial to and inconvenient to process; in addition, one path of waveguide is limited in transverse length and can be combined with the other path of waveguide through the orthogonal mode coupler only after 4 turns, so that the structure is troublesome and certain influence is caused on the performance.
Therefore, the inventor provides the following technical scheme aiming at the technical problems in the background technology:
as shown in fig. 1 to 4, an embodiment of the present invention provides an E-band dual-band short-focus parabolic antenna, including:
an antenna body 400 and a feed radiating component comprising a feed source 100 and a feed network structure 200;
the feed 100 comprises: a sub-reflecting surface 110, a sub-reflecting surface mount 120 for mounting the sub-reflecting surface 110, and a coaxial circular waveguide 130 provided inside the sub-reflecting surface mount 120; the sub-reflector bracket 120 is arranged at the top end of the feed network structure 200;
the coaxial circular waveguide 130 includes: a low-band waveguide 131, an E-band waveguide 132, a choke horn 133, a plastic member 134, a plastic film 135, and a first impedance matching member 136;
the low-frequency band waveguide tube 131 is sleeved outside the E-band frequency band waveguide tube 132, is coaxial and concentric with the E-band frequency band waveguide tube 132, the low-frequency band waveguide tube 131 penetrates out from the bottom of the antenna body 400 and is connected to the top end of the feed network structure 200, the E-band frequency band waveguide tube 132 penetrates out from the bottom of the low-frequency band waveguide tube 131 and extends and penetrates through the feed network structure 200,
the choke horn 133 is sleeved at the top end of the low-frequency waveguide tube 131, and the plastic part 134 presses the edge of the plastic film 135 at the top end of the choke horn 133, so that the plastic film 135 seals the top of the low-frequency waveguide tube 131;
the first impedance matching component 136 is provided with a central through hole along the axis thereof, the central through hole is attached to the outer wall of the E-band frequency-band waveguide 132, the outer wall of the first impedance matching component 136 is provided with a plurality of annular components distributed in a step shape, wherein at least one annular component is attached to the inner wall of the low-band waveguide 131;
the feed network structure 200 is connected to the coaxial circular waveguide 130, and is configured to separate mutually orthogonal main modes in the low-frequency band guided mode and transmit the mutually orthogonal main modes in the E-band.
In the embodiment provided by the present invention, the E band frequency waveguide 132 is sleeved in the low band waveguide 131 coaxially and concentrically, the E band frequency is transmitted in the E band frequency waveguide 132, the low band frequency is transmitted in the low band waveguide 131, and the energy radiated by the E band frequency and the low band frequency is reflected by the sub-reflecting surface 110 (sub-mirror); the choke horn 133 is sleeved on the low-frequency waveguide tube 131 and used for improving the electromagnetic radiation energy distribution transmitted from the low-frequency waveguide tube 131 so as to meet the energy distribution of a required focal length to radiation spread angle, and the choke horn 133 can enable the low-frequency band to achieve a better transmission mode ratio, increase the working bandwidth of the low-frequency band and enable the antenna to obtain the best efficiency; the orifice of the E-band frequency-band waveguide 132 is flared in a horn shape to improve the electromagnetic radiation energy distribution transmitted from the E-band frequency-band waveguide 132 to satisfy the energy distribution of the required focal ratio to radiation spread angle, and at the same time, the E-band frequency-band standing wave ratio can be matched to make it satisfy the index; the plastic part 134 is made of PC (polycarbonate) or PPO (polyphenylene oxide), the plastic film 135 is a commonly used engineering plastic film 135PI (polyimide), the thickness is 0.02mm-0.05mm, and the plastic film 135 is pressed between the plastic part 134 and the choke horn 133 in a pressing mode so as to seal the coaxial circular waveguide tube 130 and ensure the air tightness; the central through hole of the first impedance matching component 136 is attached to the outer wall of the E-band waveguide 132, and the outer wall is in a step shape, wherein at least one step is attached to the inner diameter of the low-band waveguide 131, so that the 103E-band waveguide can be fixed and centered on the low-band waveguide 131, the first impedance matching component 136 is mainly used for matching the electromagnetic impedance from the low-band waveguide 131, and the standing-wave ratio of the first impedance matching component 136 meets the index, the first impedance matching component 136 is made of PC (polycarbonate) or PPO (polyphenylene oxide), and the electromagnetic wave impedance transmitted in the low-band waveguide 131 can be changed by changing the number, the outer diameter and the height of a plurality of annular components distributed in the step shape, so that the standing-wave ratio of the low-band is improved to meet the requirement;
the invention adopts a coaxial circular waveguide tube 130 of a 'large tube-in-tube' type, namely a small wave guide tube is arranged in a large circular waveguide tube, the large and small wave guide tubes are coaxial and concentric, an E wave band is transmitted in a small circular waveguide tube, a low frequency band is transmitted in the large wave guide tube, two mutually orthogonal TE11 modes of the E wave band and the low frequency band can be transmitted in the coaxial circular waveguide tube 130 by optimizing the inner and outer diameters of the large and small circular waveguide tubes, a choke horn 133 loaded at the opening surface of a feed source 100 is a coaxial choke groove horn and also a multi-mode horn, a TM11 mode is excited, the relative phase, namely the mode ratio of a main mode (TE 11 mode) and a high order mode (TM 11 mode) is properly configured by optimizing the structural parameters of the coaxial choke groove, the characteristics that the TM11 mode only contributes to an E plane directional diagram and does not contribute to an H plane directional diagram are fully utilized to ensure that the lobe widths of the E plane directional diagram and the H plane directional diagram are basically consistent, the purpose of equalizing the beams by two polarizations is realized, so that the antenna obtains the best efficiency, and meanwhile, the working bandwidth of the corresponding frequency band can be increased due to the proper mode ratio. The main structures of the coaxial choke groove horn (multi-mode horn) are a step structure, a variable opening angle, a diaphragm excitation, a medium loading and the like (the embodiment is not limited), and in an exemplary embodiment, the step structure, the variable opening angle and the medium loading are used. This embodiment can combine the E band with any frequency band below 40 GHz.
As shown in fig. 8 and 9, in a modified embodiment, the feeding network structure 200 comprises a first polarization splitter 210, a second polarization splitter 220, a first branch and a second branch;
the second polarization splitter 220 is an orthogonal mode coupler, which includes a common end and 4 branch ends, and the 4 branch ends are in a cross structure;
the first branch includes: an E-plane 90-degree stepped bent waveguide 223, an E-plane 90-degree bent waveguide 224, a first one-way two-way T-shaped waveguide 226, and a 90-degree twisted waveguide structure 222;
two symmetrical branch ends in the second polarization separator 220 are respectively connected with one end of two E-surface 90-degree stepped bent waveguides 223, the other ends of the two E-surface 90-degree stepped bent waveguides 223 are respectively connected with two branch ends of the first one-by-one two-way T-shaped waveguide 226 through the E-surface 90-degree bent waveguides 224 in a one-to-one correspondence manner, and the combining end of the first one-by-two-way T-shaped waveguide 226 is connected with one end of a 90-degree twisted waveguide structure 222;
the second branch circuit includes: an H-plane 90-degree curved waveguide 225, an H-plane 90-degree stepped curved waveguide 221 and a second one-to-two T-shaped waveguide 227;
the other two symmetrical branch ends in the second polarization separator 220 are respectively connected with one end of the two H-face 90 ° curved waveguides 225, and the other ends of the two H-face 90 ° curved waveguides 225 are respectively connected with two branch ends of the second one-to-two path T-shaped waveguide 227 through the H-face 90 ° stepped curved waveguide 221 in a one-to-one correspondence manner;
the other end of the 90 ° twisted waveguide structure 222 and the combining end of the second one-to-two T-shaped waveguide 227 are connected to the first polarization separator 210.
When dual polarization is realized: the E-band waveguide 132 loads a first polarization separator 210, such as a circular torque polarization separator (OMT), to separate mutually orthogonal main modes (TE 11 modes) in the E-band waveguide, thereby implementing dual polarization; the low band waveguide 131 loads the second polarization splitter 220, for example, a polarization splitter of a deformed turnbull junction broadband structure, and separates main modes (TE 11 modes) orthogonal to each other in the low band waveguide mode, thereby realizing dual polarization.
In a modified embodiment, the first polarization splitter 210 is a circular torque polarization splitter. A circular moment quadrature mode coupler (OMT) can implement dual polarization. The second polarization separator 220 adopts a Turntile structure-based orthogonal mode coupler; the bottom of low-frequency band waveguide pipe cup joints with the outer wall of the public end of second polarization separator, the bottom of E wave band frequency band waveguide pipe cup joints with the inner wall of the public end of second polarization separator.
The second polarization separator 220 in this embodiment is based on the core structure of polarization separation of the turnbull junction broadband structure, improve on current core structure, through loading first branch road and second branch road, and combine 2 way rectangular waveguides of symmetry into 1 way through the polarization separator, namely, combine the polarization separation of turnbull junction broadband structure by 4 mouths and warp into 2 mouths, wherein one way is through turning 90 degrees twisted waveguide structure 222, then load the polarization separator and obtain, with another way combiner, be about 2 ways into 1 way, load the circular waveguide and realize the round export finally. On the basis of the turntile junction broadband structure OMT, the coaxial circular waveguide tube 130 is matched through structural deformation and conversion, the network is miniaturized, and the circular outlet is realized through combination of the first polarization separator 210, so that not only can single-polarization and dual-polarization exchange be realized, but also the existing conventional circular outlet separation type and direct buckling type OMT in the general market can be realized.
It should be noted that the polarization splitter of the turnsole junction broadband structure is a splitter commonly used in the prior art, and in order to match the impedance of the coaxial circular waveguide 130, a conventional means is to make some regular shaped hollows, such as a cylinder, a rectangular body, etc., at the bottom of the polarization splitter of the turnsole junction broadband structure. The H-surface 90-degree curved waveguide 225, the H-surface 90-degree step-type curved waveguide 221, the E-surface 90-degree curved waveguide 224, the E-surface 90-degree step-type curved waveguide 223, the 1-branch 2-path T-shaped waveguide, the 90-degree twisted waveguide and the conventional split OMT are all waveguide deformation structures commonly used in the industry at present. The invention flexibly and skillfully separates the polarization of the Turntile junction broadband structure through the deformation combination, flexibly applies various waveguide deformation structures, is convenient to process, and has simple and compact structure and small volume. Therefore, the E-band dual-band short-focus parabolic antenna provided by the invention has a compact structure with a low profile and a low surrounding edge, and compared with the traditional dual-band antenna, the E-band dual-band short-focus parabolic antenna is small in longitudinal size and superior in antenna performance. Secondly, the situation that the traditional double-frequency reflecting surface is pulled and deformed can be improved, the antenna is easier to assemble, and the material cost, the labor cost and the transportation cost are lower.
Referring to fig. 5, fig. 5 shows another modified structure form of the coaxial circular waveguide 130:
in a modified embodiment, the choke horn 133 includes an open-mouthed horn 1331, the inner wall of the open-mouthed horn 1331 is provided with a plurality of first grooves 101 along the axial direction thereof, the plurality of first grooves 101 are connected in a step shape, and the inner diameters of the plurality of first grooves 101 become larger in turn along the bell-mouthed direction.
In this embodiment, the flared horn 1331 is used as the choke horn 133, and the number, the outer diameter, and the height of the grooves formed in the inner wall of the flared horn 1331 are changed, so that the electromagnetic radiation energy distribution transmitted from the low-frequency-band waveguide 131 can be improved, a better transmission mode ratio of the low frequency band can be realized, the working bandwidth of the low frequency band can be increased, and the antenna can obtain the best efficiency.
Referring to fig. 6 and 7, in another modified embodiment, the choke horn 133 further includes a second impedance matching component 1332 attached to the flared horn 1331 and the plastic component 134, the second impedance matching component 1332 is provided with a circular through hole along an axis thereof, an inner wall of the circular through hole, an inner wall of the flared horn 1331 and an inner wall of the plastic component 134 are flush, an outer wall of the second impedance matching component 1332 is provided with a second groove 102 along an axis direction thereof, and the second groove 102 is connected to the plurality of first grooves 101 in a stepped manner, and an inner diameter thereof is larger than that of the first groove 101.
In this embodiment, the second impedance matching component 1332 is added on the basis of the flared horn 1331, the second impedance matching component 1332 has a hollow cylindrical shape, and is attached to the flared horn 1331, and the electromagnetic radiation energy distribution transmitted from the low-frequency-band waveguide 131 can be improved by changing the number, the outer diameter and the height of the first grooves 101 and changing the inner diameter and the height of the second grooves 102 in a matching manner, so that a better transmission mode ratio of the low-frequency band is realized, the working bandwidth of the low-frequency band is increased, and the antenna obtains the best efficiency.
In some improved embodiments, the feed source 100 further includes a matching board disposed at an outer edge of the sub-reflecting surface 110, so that a primary pattern of the feed source 100 satisfies an energy distribution of a radiation spread angle at a set focal ratio by structurally matching a ring focal curve of the sub-reflecting surface 110 and the matching board.
The E-band dual-band short-focus parabolic antenna in this embodiment is designed based on the principle of a ring-focus antenna, and forms and optimizes (structure-matches) a ring-focus curve and a matching plate of the sub-reflector 110, and combines the forming of a waveguide horn, so that a primary directional diagram of the feed source 100 meets energy distribution of a radiation spread angle of a required focal length-diameter ratio, and thus, the performance of the antenna, such as gain, a directional diagram, and XPD, meets the use requirements. The feed source 100 in this embodiment is suitable for a short focal length (focal length ratio < 0.25) reflector antenna.
In an improved embodiment, the longitudinal section of the sub-reflecting surface 110 is in a shape of a trumpet taper, and the matching plate includes a step structure 111 arranged along a trumpet opening direction at an outer wall of an opening of the sub-reflecting surface 110.
In this embodiment, an outer wall at the opening of the sub-reflecting surface 110 is provided with a step structure 111 (cascade-structure) along the bell mouth direction, that is, an outer wall at the opening of the sub-reflecting surface 110 is provided with a plurality of cams along the bell mouth direction, and the cams are connected in a step shape, and are a plurality of the outer diameters of the cams are sequentially enlarged along the bell mouth direction. The plurality of cams are used for matching the energy radiated by the E-band frequency band and the low-band frequency band, so that the distribution of the E-band frequency band and the low-band frequency band is more reasonable, and the gain and the directional diagram of the antenna can be improved by changing the number, the height and the diameter of the plurality of cams.
In some improved embodiments, the E-band dual-band short-focus parabolic antenna further includes: a holder fixing base 300, wherein the holder fixing base 300 is connected with the sub-reflecting surface holder 120 and the feeding network structure 200.
In some embodiments, the sub-reflecting surface 110 is fixed on the sub-reflecting surface bracket 120 by screws, and the sub-reflecting surface bracket 120 is made of metal material to ensure the supporting strength; the sub-reflecting surface mount 120 is fixed to the mount fixing base 300 by screws, the mount fixing base 300 is fixed to the feeding network structure 200 by screws, and the mount fixing base 300 and the sub-reflecting surface mount 120 are connected and commonly disposed at the top end of the feeding network structure 200, thereby stabilizing the sub-reflecting surface mount 120 in the horizontal direction.
In some improved embodiments, the antenna body 400 includes: an antenna central disc 410, a short-focus reflecting surface 420, a wave-absorbing material 430 and an antenna cover 440;
the bottom of feed radiation component is connected with the bottom of antenna center disk 410, short burnt plane of reflection 420 sets up in the top of antenna center disk 410, and is located subreflector 110's top, wave-absorbing material 430 sets up in the surrounding edge of short burnt plane of reflection 420 is inboard, antenna house 440 sets up in the opening top of short burnt plane of reflection 420, and seals the opening of short burnt plane of reflection 420.
In some improved embodiments, the antenna body 400 further includes a clamping edge 450, the clamping edge 450 has a third groove, a bottom end of the third groove extends to be disposed on the short-focus reflecting surface 420, and an edge of the antenna cover 440 is nested in a notch of the third groove.
In some examples, the wave-absorbing material 430 is adhered to the inner side of the peripheral edge of the short-focus reflecting surface 420 through glue, and the wave-absorbing material 430 is used for improving the level of a lobe near an antenna pattern, so that the level of the lobe near the antenna pattern meets the use requirement; the clamping edge 450 is in an 'F' shape and is provided with a groove, and the edge of the radome 440 is nested in the groove of the clamping edge 450 and is used for installing and fixing the radome 440.
It should be noted that all the above-mentioned components, which have a fitting, fastening or structure therebetween, are realized by filling glue.
While the present invention has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but rather it is to be construed that the invention effectively covers the intended scope of the invention by virtue of the prior art providing a broad interpretation of such claims in view of the appended claims. Furthermore, the foregoing describes the invention in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the invention, not presently foreseen, may nonetheless represent equivalent modifications thereto.
Claims (10)
1. An E-band dual-band short-focus parabolic antenna, comprising:
the antenna comprises an antenna body and a feed radiation component, wherein the feed radiation component comprises a feed source and a feed network structure;
the feed source comprises: the device comprises an auxiliary reflecting surface, an auxiliary reflecting surface bracket used for mounting the auxiliary reflecting surface and a coaxial circular waveguide tube arranged in the auxiliary reflecting surface bracket; the subreflector support is arranged at the top end of the feed network structure;
the coaxial circular waveguide includes: a low-frequency band waveguide tube, an E-band waveguide tube, a choke horn, a plastic part, a plastic film, and a first impedance matching part;
the low-frequency band waveguide tube is sleeved outside the E-band frequency band waveguide tube and is coaxial and concentric with the E-band frequency band waveguide tube;
the choke horn is sleeved at the top end of the low-frequency-band waveguide tube, and the plastic part presses the edge of the plastic film on the top end of the choke horn so that the plastic film seals the top of the low-frequency-band waveguide tube;
the first impedance matching component is provided with a central through hole along the axis, the central through hole is attached to the outer wall of the E-band frequency band waveguide tube, the outer wall of the first impedance matching component is provided with a plurality of annular components distributed in a step shape, and at least one annular component is attached to the inner wall of the low-frequency band waveguide tube;
the feed network structure is connected with the coaxial circular waveguide tube and is used for separating mutually orthogonal main modes in the low-frequency-band guided mode and transmitting the mutually orthogonal main modes of E wave bands.
2. The E-band dual-band short-focus parabolic antenna of claim 1, wherein the feed network structure comprises a first polarization splitter, a second polarization splitter, a first branch, and a second branch;
the second polarization separator is an orthogonal mode coupler and comprises a public end and 4 branch ends, and the 4 branch ends are in a cross structure;
the first branch includes: the waveguide structure comprises an E-surface 90-degree step-type curved waveguide, an E-surface 90-degree curved waveguide, a first one-way two-way T-shaped waveguide and a 90-degree twisted waveguide structure;
two symmetrical branch ends in the second polarization separator are respectively connected with one end of each of the two E-surface 90-degree stepped bent waveguides, the other ends of the two E-surface 90-degree stepped bent waveguides are respectively and correspondingly connected with two branch ends of the first one-by-one two-way T-shaped waveguide through the E-surface 90-degree bent waveguides, and the combining end of the first one-by-two-way T-shaped waveguide is connected with one end of the 90-degree twisted waveguide structure;
the second branch circuit includes: the waveguide comprises an H-surface 90-degree curved waveguide, an H-surface 90-degree step-type curved waveguide and a second one-to-two T-shaped waveguide;
the other two symmetrical branch ends in the second polarization separator are respectively connected with one ends of the two H-surface 90-degree bent waveguides, and the other ends of the two H-surface 90-degree bent waveguides are respectively connected with two branch ends of the second one-to-two path T-shaped waveguide in a one-to-one correspondence mode through the H-surface 90-degree stepped bent waveguides;
the other end of the 90-degree twisted waveguide structure and the combining end of the second one-to-two path T-shaped waveguide are connected with a first polarization separator together.
3. The E-band dual-band short-focus parabolic antenna according to claim 1, wherein the choke horn comprises an open-mouthed horn, an inner wall of the open-mouthed horn is provided with a plurality of first grooves along an axial direction thereof, the first grooves are connected in a step shape, and inner diameters of the first grooves become larger in sequence along the direction of the horn mouth.
4. The E-band dual-band short-focus parabolic antenna according to claim 3, wherein the choke horn further comprises a second impedance matching component, the second impedance matching component is provided with a circular through hole along an axis of the second impedance matching component, an inner wall of the circular through hole, an inner wall of the flared horn and an inner wall of the plastic component are flush at a joint, and outer walls of upper and lower ends of the second impedance matching component are respectively attached to the plastic component and the flared horn; and a second groove is formed in the outer wall of the second impedance matching component along the axis direction of the second impedance matching component, and the inner diameter of the second groove is larger than that of the first groove.
5. The E-band dual-band short-focus parabolic antenna of claim 1, wherein the feed source further comprises a matching plate disposed on an outer edge of the secondary reflector, so that a primary pattern of the feed source satisfies an energy distribution with a set focal ratio lower radiation spread angle by performing structural matching on a ring focal curve of the secondary reflector and the matching plate.
6. The E-band dual-band short-focus parabolic antenna of claim 1, wherein the longitudinal cross section of the sub-reflecting surface is in a shape of a trumpet taper, and the matching plate comprises a stepped structure disposed along a trumpet opening at an outer wall of an opening of the sub-reflecting surface.
7. The E-band dual-band short-focus parabolic antenna of claim 1, wherein the E-band dual-band short-focus parabolic antenna further comprises a bracket holder, and the bracket holder is connected with the sub-reflector bracket and the feed network structure.
8. The E-band dual-band short-focus parabolic antenna of claim 1, wherein the antenna body comprises: the antenna comprises an antenna central disc, a short-focus reflecting surface, a wave-absorbing material and an antenna housing;
the bottom of feed radiation component is connected with the bottom of antenna center panel, the short burnt plane of reflection sets up in the top of antenna center panel, and is located the top of subreflector, wave-absorbing material set up in the surrounding edge inboard of short burnt plane of reflection, the antenna house sets up in the opening top of short burnt plane of reflection, and seals the opening of short burnt plane of reflection.
9. The E-band dual-band short-focus parabolic antenna of claim 8, wherein the antenna body further comprises a clamping edge, the clamping edge is provided with a third groove, one end of the bottom of the third groove extends to be disposed on the short-focus reflecting surface, and the edge of the radome is nested in the notch of the third groove.
10. A wireless communication system comprising the E-band dual-band short-focus parabolic antenna of any one of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115621738A (en) * | 2022-12-19 | 2023-01-17 | 西安电子科技大学 | Microwave antenna feed structure and microwave antenna system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115621738A (en) * | 2022-12-19 | 2023-01-17 | 西安电子科技大学 | Microwave antenna feed structure and microwave antenna system |
| CN115621738B (en) * | 2022-12-19 | 2023-03-21 | 西安电子科技大学 | Microwave antenna feed structure and microwave antenna system |
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