Broadband coaxial monopulse self-tracking feed source

Abstract

The invention discloses a broadband coaxial monopulse self-tracking feed source, and belongs to the technical field of communication antennas. The antenna comprises a radiation horn, and the radiation horn is provided with two radiation channels which are respectively a sum path radiation channel and a difference path radiation channel. The sum path radiation channel comprises a shaping side wall and a shaping metal rod; the shaping metal bar is located in the shaping side wall, and the shaping metal bar and the shaping side wall are coaxially arranged; the shaping side wall and the shaping metal bar are connected through a reflecting plate located below the shaping side wall and the shaping metal bar. A probe A perpendicular to the axis direction of the radiation horn is arranged above the reflecting plate; the main body of the difference path radiation channel is an annular side wall; the annular side wall sleeves the top of the outer side of the shaped side wall, and the annular side wall and the shaped side wall form an integrated structure through the bottom plate; a probe B penetrating into the groove is also arranged on the annular side wall; the number of the probes B is eight, and the probes B are evenly distributed along the annular side wall. Broadband monopulse tracking can be realized, the irradiation efficiency is high, and the tracking mode is complete.

Description

Technical Field

[0001] The invention relates to the technical field of communication antennas, in particular to a broadband coaxial single-pulse self-tracking feed source. Background Art

[0002] Broadband self-tracking feeds are widely used in the fields of remote sensing, detection and reconnaissance. The single pulse self-tracking feeds used in the project are mainly based on the TE21 mode and TM01 mode feeds of the waveguide system, multi-horn feeds, and circumferential array feeds. The feed based on the TE21 mode of the waveguide system has the advantages of good directional pattern equalization, complete tracking mode, and high illumination efficiency, but its volume is large and the bandwidth is narrow; the feed based on the TM01 mode of the waveguide system has the advantages of simple implementation and high illumination efficiency, but its bandwidth is narrow and the tracking mode is incomplete; the multi-horn feed has the advantages of simple implementation and complete tracking mode, but its bandwidth is narrow and the illumination efficiency is low; the circumferential array feed has the advantages of wide working bandwidth and complete tracking mode, but its network is complex and the loss is large, and it is limited by the processing technology and has low illumination efficiency. Therefore, the broadband single pulse self-tracking feed with wide bandwidth, high illumination efficiency, complete tracking mode and simple structure is the focus of current research. Summary of the invention

[0003] In view of this, the present invention proposes a broadband coaxial single pulse self-tracking feed, which can realize broadband single pulse tracking, and has high irradiation efficiency and complete tracking mode.

[0004] Based on the above purpose, the technical solution provided by the present invention is:

[0005] A broadband coaxial single pulse self-tracking feed source comprises a radiation horn, wherein the radiation horn is provided with two radiation channels, namely a sum radiation channel and a difference radiation channel;

[0006] The Helu radiation channel includes a shaped side wall and a shaped metal rod; the shaped metal rod is located in the shaped side wall, and the two are coaxially arranged; a cylindrical side wall integrally formed with the shaped side wall is provided below the shaped side wall; the bottom of the shaped metal rod extends into the cylindrical side wall and is connected to the bottom surface of the cylindrical side wall as a reflector; a gap is provided between the shaped metal rod and the inner wall of the cylindrical side wall; an annular defect is provided at the bottom of the shaped metal rod; a probe A perpendicular to the axis of the radiation horn passes through the cylindrical side wall, part of which is connected to the shaped metal rod, and part of which is located in the annular cavity formed by the annular defect;

[0007] The main body of the differential path radiation channel is an annular side wall; the annular side wall is sleeved on the top of the outer side of the shaped side wall, and the two form an integrated structure through the bottom plate 9; the annular side wall, the bottom plate and the outer wall of the shaped side wall form a groove 10 with the same opening direction as the horn mouth direction of the radiation horn; the annular side wall is also provided with a probe B penetrating into the groove; the probe B is provided with 8 and evenly distributed along the annular side wall;

[0008] Probe A and probe B are both perpendicular to the axial direction of the radiation horn.

[0009] Furthermore, the ends of the probe A and the probe B are both connected to a feeder line leading to the outside of the radiation horn.

[0010] Furthermore, the contour curve of the shaped metal rod and the curve of the shaped side wall are both fitting curves;

[0011] The shaped metal rod and the shaped side wall are both obtained by optimizing the antenna efficiency. The contour curve of the shaped metal rod and the shaped side wall curve are both obtained by optimizing the coordinate values ​​of their respective discrete points.

[0012] Furthermore, the feeder line is a coaxial cable, and the probe is integrated with the central core line of the coaxial cable.

[0013] Furthermore, the annular side wall of the differential path radiation channel and the shaped side wall of the sum path radiation channel are at the same height at the bell mouth, and the vertical distance between the bottom plate of the differential path radiation channel and the bell mouth is obtained by optimization calculation.

[0014] Furthermore, the shapes of the probe A and the probe B are obtained through optimization calculations, the probe B does not contact the shaped side wall of the Helu radiation channel, and the probe A contacts the shaped metal rod.

[0015] Compared with the background technology, the present invention has the following beneficial effects:

[0016] 1. The sum radiation channel and the difference radiation channel in the present invention are two relatively independent channels with high isolation.

[0017] 2. In the present invention, the optimal solution for antenna efficiency is obtained by optimizing the metal rod contour curve and the shaped side wall curve in the middle of the radiation channel.

[0018] 3. In the present invention, better difference signal performance can be obtained by optimizing the vertical distance between the bottom plate of the difference path radiation channel and the horn mouth.

[0019] 4. In the present invention, by optimizing the shapes of the differential path radiation channel probe and the sum path radiation channel probe, the sum path signal and the differential path signal can be well matched.

[0020] 5. In the present invention, both the sum signal and the difference signal of the radiation horn can be broadbanded, with high irradiation efficiency and complete tracking mode.

[0021] In summary, the present invention has a simple structure, is easy to implement, has excellent electrical performance, can realize broadband single pulse tracking, has high irradiation efficiency and complete tracking mode, and is an important improvement over the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2 is a schematic diagram of a three-dimensional structure of a broadband coaxial monopulse self-tracking feed according to an embodiment of the present invention;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of a sum radiation channel in a broadband coaxial single pulse self-tracking feed in an embodiment of the present invention;

[0024] Figure 3 It is a three-dimensional structural schematic diagram of a differential radiation channel in a broadband coaxial single-pulse self-tracking feed in an embodiment of the present invention.

[0025] Figure 4 It is a schematic cross-sectional structure diagram of a broadband coaxial monopulse self-tracking feed in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] A broadband coaxial single pulse self-tracking feed source includes a radiation horn, which has two radiation channels, a summing path radiation channel and a differential path radiation channel. In the middle of the summing path radiation channel, there is a shaped metal rod and a shaped side wall coaxial with the metal rod, the metal rod and the shaped side wall are connected by a reflecting plate, and a probe perpendicular to the axial direction of the radiation horn is also provided above the reflecting plate. The differential path radiation channel includes an annular side wall coaxial with the summing path radiation channel and a bottom plate for connecting the annular side wall and the shaped side wall. Under the blocking effect of the bottom plate, the gap between the shaped side wall and the annular side wall forms a groove with an opening direction the same as the horn mouth direction of the radiation horn, and eight probes are evenly distributed, non-contacting, and perpendicular to the axial direction of the radiation horn on the annular side wall.

[0028] Optionally, a feeder wire leading to the outside of the radiation horn is connected to the end of the probe which is perpendicular to the axial direction of the radiation horn above the reflector plate. The feeder wire is a coaxial cable, and the probe is integrated with the central core wire of the coaxial cable.

[0029] Optionally, at the ends of eight probes evenly distributed and not in contact with each other on the annular side wall, there are feeders leading to the outside of the radiation horn, the feeders are coaxial cables, and the probes are integrated with the central core wire of the coaxial cable.

[0030] Optionally, the sum path radiation channel and the difference path radiation channel are two relatively independent channels with high isolation.

[0031] Optionally, the metal rod and the shaped side wall in the middle of the Helu radiation channel are obtained with the optimization goal of optimizing the antenna efficiency, and the metal rod contour curve and the shaped side wall curve are obtained by optimizing the coordinate values ​​of their respective discrete points.

[0032] Optionally, the annular side wall of the differential path radiation channel and the shaped side wall of the sum path radiation channel are at the same height at the bell mouth, and the vertical distance between the bottom plate of the differential path radiation channel and the bell mouth is obtained by optimization calculation.

[0033] Optionally, the shapes of the differential radiation channel probe and the sum radiation channel probe are both obtained through optimization calculation, the differential radiation channel probe does not contact the shaped side wall of the sum radiation channel, and the sum radiation channel probe is in good contact with the middle metal rod.

[0034] like Figure 1-Figure 4 As shown, a broadband coaxial single pulse self-tracking feed includes a radiation horn 1, and the radiation horn 1 includes a sum path radiation channel 2 and a difference path radiation channel 3. In the middle of the sum path radiation channel 2, there is a shaped metal rod 4 and a shaped side wall 5 coaxial with the metal rod, and the metal rod 4 is connected to the shaped side wall 5 through a reflection plate 6, and a probe 7 perpendicular to the axial direction of the radiation horn 1 is provided above the reflection plate 6. The difference path radiation channel 3 includes an annular side wall 8 coaxial with the sum path radiation channel 2, and a bottom plate 9 for connecting the annular side wall 8 and the shaped side wall 5. Under the blocking effect of the bottom plate 9, the gap between the shaped side wall 5 and the annular side wall 8 forms a groove 10 with the same opening direction as the horn mouth direction of the radiation horn 1, and eight probes 11 evenly distributed, non-contacting, and perpendicular to the axial direction of the radiation horn 1 are provided on the annular side wall 8.

[0035] Optional, see Figure 4 The end of the probe 7 in the sum path radiation channel 2 is connected to a feeder line 13 leading to the outside of the radiation horn 1 , and the end of the probe 11 in the difference path radiation channel 3 is connected to a feeder line 12 leading to the outside of the radiation horn 1 .

[0036] Optionally, the feeder line 12 and the feeder line 13 are both coaxial cables, and the probe 7 and the probe 11 are respectively integrated with the central core wire of the coaxial cable.

[0037] Optionally, the sum path radiation channel 2 and the difference path radiation channel 3 are two relatively independent channels.

[0038] Optionally, the curve of the shaped metal rod 4 and the curve of the shaped side wall 5 are both fitting curves.

[0039] Optionally, the annular side wall 8 in the differential path radiation channel 3 and the shaped side wall 5 in the sum path radiation channel 2 are at the same height at the bell mouth.

[0040] Optionally, the probe 11 in the differential radiation channel 3 is not in contact with the shaped side wall 5 in the sum radiation channel 2 .

[0041] Optionally, the probe 7 in the radiation channel 2 is in good contact with the middle metal rod 4 .

[0042] In the above embodiments, the shaped metal rods in the radiation channel and the curves in the shaped side walls are obtained with antenna efficiency as the optimization target. Among them, the curve is represented by a number of discrete points, and the curve shape that meets the optimization target can be obtained by optimizing the coordinate values ​​of the discrete points. In addition, the signal can be broadbanded by optimizing the curve. It should be noted that those skilled in the art can calculate the various specific shapes and sizes mentioned above by themselves under the prompts of this patent, but this does not mean that the prompts of this patent itself belong to the prior art. In fact, these prompts disclosed in this patent themselves are part of the technical features that contribute to the patentability of this patent.

[0043] In the above embodiment, the sum path radiation channel and the difference path radiation channel are two relatively independent channels with high isolation. The vertical distance between the bottom plate and the horn mouth in the difference path radiation channel is obtained with the difference signal performance as the optimization target. The probe shape in the sum path radiation channel and the probe shape in the difference path radiation channel are obtained with the voltage standing wave ratio as the target.

[0044] In the above embodiment, the differential path radiation channel has 8 evenly distributed feeders to lead out the signal, and the rear ends of the 8 feeders can simultaneously realize signal single pulse tracking by connecting multiple bridges. The differential signal realized in this form can achieve broadband.

[0045] In summary, the present invention has a simple structure, is easy to implement, has excellent electrical performance, can realize broadband single pulse tracking, has high irradiation efficiency and complete tracking mode, and is an important improvement over the prior art.

[0046] It should be understood that the above description of the specific implementation methods of this patent is only an exemplary description listed to facilitate ordinary technicians in the field to understand the patent scheme, and does not imply that the scope of protection of this patent is limited to these individual examples. Ordinary technicians in this field can fully understand the technical scheme of this patent and, without any creative work, obtain more specific implementation methods by combining technical features, replacing some technical features, adding more technical features, etc. to the examples listed in this patent. All these specific implementation methods are within the scope of the claims of this patent. Therefore, these new specific implementation methods should also be within the scope of protection of this patent.

Claims

1. A broadband coaxial monopulse self-tracking feed, comprising a radiating horn, characterized in that: The radiation horn is provided with two radiation channels, namely a sum radiation channel and a difference radiation channel; The Helu radiation channel includes a shaped side wall and a shaped metal rod; the shaped metal rod is located in the shaped side wall, and the two are coaxially arranged; a cylindrical side wall integrally formed with the shaped side wall is provided below the shaped side wall; the bottom of the shaped metal rod extends into the cylindrical side wall and is connected to the bottom surface of the cylindrical side wall as a reflector; a gap is provided between the shaped metal rod and the inner wall of the cylindrical side wall; an annular defect is provided at the bottom of the shaped metal rod; a probe A perpendicular to the axis of the radiation horn passes through the cylindrical side wall, part of which is connected to the shaped metal rod, and part of which is located in the annular cavity formed by the annular defect; The main body of the differential path radiation channel is an annular side wall; the annular side wall is sleeved on the top of the outer side of the shaped side wall, and the two form an integrated structure through a bottom plate (9); the annular side wall, the bottom plate and the outer wall of the shaped side wall form a groove (10) with an opening direction that is the same as the direction of the horn mouth of the radiation horn; a probe B penetrating into the groove is also provided on the annular side wall; the probes B are provided in 8 numbers and are evenly distributed along the annular side wall; Probe A and probe B are both perpendicular to the axial direction of the radiation horn.

2. A broadband coaxial monopulse self-tracking feed according to claim 1, characterized in that: The ends of the probe A and the probe B are both connected with a feeder wire leading to the outside of the radiation horn.

3. A broadband coaxial monopulse self-tracking feed according to claim 1, characterized in that: The contour curve of the shaped metal rod and the curve of the shaped side wall are both fitting curves; The shaped metal rod and the shaped side wall are both obtained by optimizing the antenna efficiency. The contour curve of the shaped metal rod and the shaped side wall curve are both obtained by optimizing the coordinate values ​​of their respective discrete points.

4. A broadband coaxial monopulse self-tracking feed according to claim 2, characterized in that: The feed line is a coaxial cable, and the probe is integrated with the central core wire of the coaxial cable.

5. The broadband coaxial monopulse self-tracking feed according to claim 1, characterized in that: The annular side wall of the differential path radiation channel and the shaped side wall of the sum path radiation channel are at the same height at the bell mouth, and the vertical distance between the bottom plate of the differential path radiation channel and the bell mouth is obtained by optimization calculation.

6. The broadband coaxial monopulse self-tracking feed according to claim 1, characterized in that: The shapes of the probe A and the probe B are obtained through optimization calculation. The probe B does not contact the shaped side wall of the Helu radiation channel, and the probe A contacts the shaped metal rod.

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