A high-power coaxial feed

Abstract

The application discloses a kind of high-power coaxial feed, including coaxial double-ridge horn opening section, ridge waveguide conversion section and coaxial waveguide conversion section, internally provided with an internal hollow stepped ridge section and a pair of internal hollow arc ridge section, the top of stepped ridge section is connected with the bottom of same side arc ridge section, the bottom of stepped ridge section extends into coaxial waveguide conversion section, the bottom of coaxial waveguide conversion section is equipped with bottom cover, coaxial inner conductor and coaxial outer conductor are coaxially arranged in the middle of bottom cover, the outside of coaxial inner conductor is wrapped with the medium body with conical frustum top, the top of coaxial inner conductor and medium body penetrates bottom cover and extends into coaxial waveguide conversion section, stepped ridge section is integrally provided with connecting block, threaded hole and air hole are processed on connecting block, coaxial inner conductor is coaxially arranged with threaded hole, and the top of coaxial inner conductor extends into threaded hole, the design is small in size, light in weight, easy to layout, and the discharge threshold is 10 times higher than that of traditional related products.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of spaceborne high-power antennas, and particularly relates to a high-power coaxial feed source. BACKGROUND

[0002] A high-orbit SAR satellite can combine the orbit position advantage of the geosynchronous orbit with the strong penetration ability of the SAR satellite, which is not affected by weather conditions and night, China has included the high-orbit SAR satellite in the National Civil Space Infrastructure Construction Medium and Long-Term Development Plan, the high-orbit SAR satellite has the revisit observation ability of time interval of hours for most areas of China, and can effectively meet the disaster emergency monitoring demand, and also meets the application demand of the land and resources, earthquake, water conservancy, meteorology, ocean, environmental protection, agriculture, forestry and other industries.

[0003] Since the distance between the high-orbit SAR satellite and the earth is relatively far, the large-scale deployable antenna technology and the high-power feed channel technology are the core technologies of the high-orbit SAR satellite. Meanwhile, considering the need to form a certain number of beams and the high-power bearing capacity of each channel, the high-orbit SAR satellite needs an antenna array of a certain scale, and the current on-board high-power channel mostly adopts a waveguide system, when the frequency is relatively low, the waveguide is large in volume and heavy in weight, and cannot meet the weight and layout demand of the satellite for more channels, and the existing coaxial feed source cannot meet the super large power of the high-orbit SAR satellite concentrated feed due to the micro-discharge or low-pressure discharge threshold limit. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a high-power coaxial feed source, which can solve the technical problem that the existing coaxial feed source cannot be applied to the super large power of the high-orbit SAR satellite concentrated feed due to the micro-discharge or low-pressure discharge threshold limit.

[0005] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0006] A high-power coaxial feed source, comprising a double-ridge horn flared section, a ridge waveguide conversion section and a coaxial waveguide conversion section which are coaxially arranged and connected in sequence, an inner surface of one transverse side wall of the ridge waveguide conversion section is provided with a vertically arranged internal hollow stepped ridge section, inner surfaces of transverse two side walls of the double-ridge horn flared section are both provided with a vertically arranged internal hollow arc-shaped ridge section, a top end of the stepped ridge section is connected with a bottom end of the arc-shaped ridge section on the same side, and a bottom end of the stepped ridge section extends into the coaxial waveguide conversion section, and a bottom cover plate is installed at a bottom end of the coaxial waveguide conversion section;

[0007] The coaxial inner conductor is wrapped with a dielectric body, the top end of the coaxial inner conductor and the dielectric body penetrates the bottom cover plate and extends into the coaxial waveguide conversion section, the bottom surface of the bottom cover plate is provided with a mounting base coaxial with the coaxial inner conductor, a coaxial outer conductor is mounted on the mounting base, and the bottom end of the coaxial inner conductor and the coaxial outer conductor is connected with a radio frequency coaxial connector plug;

[0008] The upper surface of the stepped ridge section bottom plate is integrally provided with a connecting block, a threaded hole penetrating the bottom of the connecting block is vertically processed on the connecting block, the threaded hole is coaxial with the coaxial inner conductor, and the top end of the coaxial inner conductor extending out of the dielectric body extends into the threaded hole and is threadedly connected with the connecting block.

[0009] The application also comprises the following technical features:

[0010] The lateral outer sides of the pair of arc-shaped ridge sections are open, the lateral two side walls of the double-ridge horn flare section are provided with a first strip-shaped window along the vertical central axis and matched with the height and width of the arc-shaped ridge section, and the open end edges of the pair of arc-shaped ridge sections are fixedly connected with the edges of the same side first strip-shaped window.

[0011] The lateral outer sides and the top of the stepped ridge section are open, the ridge waveguide conversion section is provided with a second strip-shaped window along the vertical central axis and matched with the height and width of the stepped ridge section, the top end of the second strip-shaped window is communicated with the bottom end of the same side first strip-shaped window, the lateral outer side edge of the stepped ridge section is fixedly connected with the edge of the second strip-shaped window, and the top edge of the stepped ridge section is fixedly connected with the bottom end edge of the same side arc-shaped ridge section.

[0012] The connecting block is vertically provided with an air vent hole coaxial with the threaded hole, the bottom end of the air vent hole is communicated with the top end of the threaded hole, and the top end of the air vent hole penetrates the top of the connecting block and is communicated with the outside.

[0013] The dielectric body comprises an inner dielectric body and an outer dielectric body, the inner dielectric body is in a conical frustum shape, the bottom of the inner dielectric body is close to the upper surface of the bottom cover plate, and the top of the inner dielectric body is close to the lower surface of the connecting block; the top of the outer dielectric body is fixedly connected with the bottom of the inner dielectric body, and the bottom of the outer dielectric body extends out of the bottom cover plate to the bottom end edge of the coaxial inner conductor.

[0014] The taper range of the inner dielectric body is 1:6-1:7, and the height ratio of the height of the inner dielectric body to the distance between the upper surface of the inner dielectric body and the lower surface of the connecting block is 6:1.

[0015] The double-ridge horn flare section comprises a flare section and a straight section, the vertical height ratio of the flare section to the straight section is 1:2, and the lateral width ratio of the flare section to the straight section is 5:8.

[0016] The arc-shaped ridge segment accounts for two-thirds of the overall height of the double-ridge horn flare segment, and the length ratio of the longitudinal width of the arc-shaped ridge segment to the longitudinal width of the double-ridge horn flare segment is 1:6.

[0017] The thickness of the stepped ridge segment is 20mm-40mm, the stepped ridge segment comprises a first step, a second step and a third step connected to each other, the height ratio of the first step, the second step and the third step is 13:11:5, and the lateral width ratio of the first step, the second step and the third step is 2:3:8.

[0018] The length ratio of the longitudinal width of the stepped ridge segment to the longitudinal width of the ridge waveguide conversion segment is 1:6.

[0019] The length ratio of the lateral width of the first step of the stepped ridge segment to the lateral width of the bottom of the arc-shaped ridge segment is 2:3.

[0020] The material of the medium body is the same as that of the radio frequency cable connector.

[0021] Compared with the prior art, the present application has the following technical effects:

[0022] (1) The present application adopts the integrated design of electric field and air path, the coaxial design of the inner conductor and the threaded hole, and the integrated use of the stepped ridge segment and the arc-shaped ridge segment, realizes the conversion of electromagnetic signals from the coaxial system to the waveguide system, and realizes the conversion of electromagnetic signals from the waveguide system to the free space through the arc-shaped ridge segment with the exponential flare form and the double-ridge horn flare segment. When used in the low frequency band, the present application can be applied to a certain scale of feed array, and compared with the traditional satellite waveguide high-power feed related product, when the system is connected with other products, the problem of difficult layout caused by the use of a large number of waveguides is avoided, and the weight is greatly reduced.

[0023] (2) The unique air vent design of the present application can effectively discharge the gas in the threaded hole, thereby avoiding the sudden discharge of the gas in the threaded hole, the local generation of a low-pressure environment, and the induction of low-pressure discharge. At the same time, the metal debris left in the threaded hole can be effectively discharged to the outside of the feed, thereby avoiding the induction of micro-discharge by the excess metal particles.

[0024] (3) The conical frustum structure of the medium body and the medium selection of the radio frequency cable connector in the present application can ensure that the trace gas generated by the medium body due to the temperature rise of the inner conductor of the coaxial cable during high-power operation of the feed can be discharged along a specific air path, and can also ensure that the electric field is extremely weak at the top of the medium body, and no gas is discharged in the area where the electric field intensity is relatively high, thereby improving the discharge threshold, making the present application applicable to a super-power feed array of a high-orbit SAR satellite centralized feed, and making the micro-discharge threshold of the satellite coaxial feed reach 10000 watts, which is 10 times higher than that of the traditional satellite coaxial feed related product. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall structure of the present application.

[0026] Figure 2 is the overall structure of the present application. Figure 1 is the partial structure of the present application.

[0027] Figure 3 is the overall structure of the present application.

[0028] Figure 4 is the electric field simulation result of the coaxial waveguide conversion section of the present application.

[0029] The meanings of various reference numbers in the drawings are as follows:

[0030] 1, double-ridged horn flare section, 2, ridge waveguide conversion section, 3, coaxial waveguide conversion section, 4, stepped ridge section, 5, arc-shaped ridge section, 6, bottom cover plate, 7, coaxial outer conductor, 8, coaxial inner conductor, 9, dielectric body, 10, first strip window, 11, second strip window;

[0031] 111, flare section, 112, straight section;

[0032] 41, connecting block, 42, threaded hole, 43, air vent hole, 44, first step, 45, second step, 46, third step;

[0033] 91, inner dielectric body, 92, outer dielectric body.

[0034] The specific content of the present application is further explained in detail in combination with the following embodiments. DETAILED DESCRIPTION

[0035] In accordance with the above technical solution, the following specific embodiments of the present application are given. It should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation made on the basis of the technical solution of the present application falls within the scope of protection of the present application.

[0036] In the present application, unless otherwise stated, the orientation words such as "up", "down", "left", "right" and the like are generally defined with respect to the drawing surface in the corresponding drawing, "inner" and "outer" refer to the inner and outer contours of the corresponding parts, and "longitudinal", "transverse" and "vertical" refer to the directions marked in the drawing.

[0037] Embodiment:

[0038] The present embodiment gives a kind of high-power coaxial feed, such as Figures 1 to 3As shown, it comprises a double-ridge horn flared section 1, a ridge waveguide conversion section 2 and a coaxial waveguide conversion section 3 arranged coaxially and connected in sequence, a stepped ridge section 4 with an internal cavity is arranged vertically on the inner surface of one lateral side wall of the ridge waveguide conversion section 2, arc-shaped ridge sections 5 with internal cavities are arranged vertically on the inner surfaces of the two lateral side walls of the double-ridge horn flared section 1, the top end of the stepped ridge section 4 is connected to the bottom end of the same side arc-shaped ridge section 5, and the bottom end of the stepped ridge section 4 extends into the coaxial waveguide conversion section 3, and a bottom cover plate 6 is installed at the bottom end of the coaxial waveguide conversion section 3.

[0039] A coaxial inner conductor 8 is installed at the center of the bottom cover plate 6, and a dielectric body 9 is wrapped outside the coaxial inner conductor 8, the top end of the coaxial inner conductor 8 and the dielectric body 9 extends into the coaxial waveguide conversion section 3 through the bottom cover plate 6, and a mounting base coaxial with the coaxial inner conductor 8 is arranged on the lower surface of the bottom cover plate 6, a coaxial outer conductor 7 is mounted on the mounting base, and the bottom ends of the coaxial inner conductor 8 and the coaxial outer conductor 7 are connected with a radio frequency coaxial connector plug.

[0040] A connecting block 41 is integrally arranged on the upper surface of the stepped ridge section 4 bottom plate, a threaded hole 42 penetrating the bottom of the connecting block is vertically machined on the connecting block 41, the threaded hole 42 is coaxial with the coaxial inner conductor 8, and the top end of the coaxial inner conductor 8 extending out of the dielectric body 9 extends into the threaded hole 42 and is threadedly connected with the connecting block 41.

[0041] In this embodiment, the bottom ends of the coaxial outer conductor 7 and the coaxial inner conductor 8 are coaxial outlets, which are ports for connecting with other external equipment as high-power feed sources, and are matched with the radio frequency coaxial connector plug in this embodiment, the top end of the coaxial inner conductor 8 is electrically connected with the ridge waveguide conversion section 2 through the threaded hole 42, and then the electromagnetic signal is radiated into space through the double-ridge horn flared section 1.

[0042] As a preferred scheme of this embodiment, the lateral outer sides of the pair of arc-shaped ridge sections 5 are open, the two lateral side walls of the double-ridge horn flared section 1 are each provided with a first strip-shaped window 10 matching the height and width of the arc-shaped ridge section 5 along the vertical central axis, and the open end edges of the pair of arc-shaped ridge sections 5 are respectively fixedly connected with the edges of the same side first strip-shaped window 10.

[0043] The lateral outer side and the top of the stepped ridge section 4 are open, the side wall of the ridge waveguide conversion section 2 installed the stepped ridge section 4 is provided with a second strip window 11 along the vertical central axis, which matches the height and width of the stepped ridge section 4, the top end of the second strip window 11 is communicated with the bottom end of the first strip window 10 on the same side, the edge of the lateral outer side of the stepped ridge section 4 is fixedly connected with the edge of the second strip window 11, and the top edge of the stepped ridge section 4 is fixedly connected with the bottom edge of the arc-shaped ridge section 5 on the same side. Through the design of the stepped structure of the stepped ridge section 4, the conversion of the electromagnetic signal from the coaxial system to the waveguide system is realized, and through the design of the arc-shaped ridge section 5 in the form of exponential opening and the double-ridge horn opening section 1, the conversion of the electromagnetic signal from the waveguide system to the free space is realized.

[0044] As a preferred scheme of the embodiment, the connection block 41 is provided with a ventilation hole 43 coaxially arranged with the threaded hole 42 in the vertical direction, the bottom end of the ventilation hole 43 is communicated with the top end of the threaded hole 42, and the top end of the ventilation hole 43 penetrates through the top of the connection block 41 and is communicated with the outside of the feed source through the stepped ridge section 4. The gas in the threaded hole 42 can be effectively discharged through the ventilation hole 43, so that the sudden discharge of the gas in the threaded hole 42 is avoided, the low-pressure environment is not locally generated, the low-pressure discharge is not induced, the metal scraps generated by the rotation of the inner conductor 8 during the installation of the connection into the threaded hole 42 can be effectively discharged to the outside of the feed source through the ventilation hole 43 after the satellite is launched into the atmosphere, so that the micro-discharge induced by the excess metal particles is avoided, according to the skin effect principle, the high-frequency electromagnetic wave only exists on the surface of the inner conductor, the ventilation hole 43 does not affect the electric field distribution inside the high-power feed source, and the transmission of the electromagnetic signal is not affected.

[0045] As a preferred scheme of the embodiment, the medium body 9 includes an inner medium body 91 and an outer medium body 92. The inner medium body 91 is in the shape of a circular truncated cone, and the shape of the circular truncated cone is conformal to the electric field distribution in the coaxial waveguide conversion section 3 according to the distribution of the electric field inside the feed source. The bottom of the inner medium body 91 is close to the upper surface of the bottom cover plate 6, and the top of the inner medium body 91 is close to the lower surface of the connection block 41. The top of the outer medium body 92 is fixedly connected with the bottom of the inner medium body 91, and the bottom of the outer medium body 92 extends out of the bottom cover plate 6 to the bottom edge of the inner conductor 8.

[0046] Further, the taper range of the inner medium body 91 is 1:6-1:7, and the height ratio of the height of the inner medium body 91 to the distance between the upper surface of the inner medium body 91 and the lower surface of the connection block 41 is 6:1. The taper design of the inner medium body 91 and the height ratio between the inner medium body 91 and the lower surface of the connection block 41 can effectively discharge the trace gas generated by the medium body 9 when the temperature of the joint inner conductor 8 rises during the high-power operation of the feed source, from the top of the medium body 9 along the joint surface of the medium body 9 and the inner conductor 8.Figure 4 As shown, the structural design of the dielectric body 9 can ensure that the electric field at the top of the dielectric body 9 is extremely weak, and no gas is discharged in the area where the electric field is relatively strong, thereby improving the discharge threshold.

[0047] As a preferred scheme of the embodiment, the flare section 1 of the double-ridge horn in the embodiment includes a flare section 111 and a straight section 112, the vertical height ratio of the flare section 111 and the straight section 112 is 1:2, and the lateral width ratio of the flare section 111 and the straight section 112 is 5:8; further, the arc-shaped ridge section 5 accounts for two-thirds of the overall height of the flare section 1 of the double-ridge horn, and the length ratio of the longitudinal width of the arc-shaped ridge section 5 to the longitudinal width of the flare section 1 of the double-ridge horn is 1:6, so that the main mode impedance of the ridge waveguide is matched with the impedance of the coaxial line, while the size of the feed source is smaller and the mass is lighter.

[0048] As a preferred scheme of the embodiment, the thickness of the stepped ridge section 4 in the embodiment is 20mm-40mm, the stepped ridge section 4 includes a first step 44, a second step 45 and a third step 46 connected to each other, the height ratio of the first step 44, the second step 45 and the third step 46 is 13:11:5, and the lateral width ratio of the first step 44, the second step 45 and the third step 46 is 2:3:8; the length ratio of the longitudinal width of the stepped ridge section 4 to the longitudinal width of the ridge waveguide transition section 2 is 1:6, and the different step heights and the thickness range of the thickness of the stepped ridge section 4 can realize impedance matching of the feed source in different frequency bands, and realize the conversion of signals from the coaxial system to the waveguide system.

[0049] Further, the length ratio of the lateral width of the first step 44 of the stepped ridge section 4 to the lateral width of the bottom of the arc-shaped ridge section 5 is 2:3, which ensures that the electromagnetic signal can be transmitted along the stepped ridge section 4 to the arc-shaped ridge section 5, and realizes the conversion of the electromagnetic signal from the waveguide system to the free space.

[0050] As a preferred scheme of the embodiment, the material of the dielectric body 9 in the embodiment is the same as the material of the dielectric of the radio frequency cable connector, which can ensure that the trace gas generated by the dielectric body 9 due to the temperature rise of the inner conductor 8 of the coaxial cable under high-power operation can be discharged along a specific gas path.

[0051] In the embodiment, the electric field and gas path are designed together, and the vent hole is designed reasonably, so that the pulse withstand power of the high-power coaxial feed source can reach 10000W, the discharge threshold of the related product of the traditional satellite-borne coaxial feed source is improved by an order of magnitude, and the problem that the existing coaxial feed source cannot be applied to the super-large power feed array in the high-orbit SAR system due to insufficient discharge threshold caused by micro-discharge or low-pressure discharge is solved, and compared with the traditional waveguide type high-power coaxial feed source, when connected with other equipment, the layout is easy, including small size and light weight.

Claims

1. A high-power coaxial feed, characterized in that, The system includes a double-ridged horn opening section (1), a ridged waveguide transformation section (2), and a coaxial waveguide transformation section (3) that are coaxially arranged and connected in sequence. A hollow stepped ridge section (4) is arranged vertically on the inner surface of one transverse sidewall of the ridged waveguide transformation section (2). A hollow arc-shaped ridge section (5) is arranged vertically on the inner surface of both transverse sidewalls of the double-ridged horn opening section (1). The top of the stepped ridge section (4) is connected to the bottom of the arc-shaped ridge section (5) on the same side. The bottom of the stepped ridge section (4) extends into the coaxial waveguide transformation section (3). A bottom cover plate (6) is installed at the bottom of the coaxial waveguide transformation section (3). A coaxial inner conductor (8) is installed at the center of the bottom cover plate (6). A dielectric body (9) is wrapped around the outside of the coaxial inner conductor (8). The top ends of the coaxial inner conductor (8) and the dielectric body (9) extend through the bottom cover plate (6) into the coaxial waveguide conversion section (3). A mounting base coaxially arranged with the coaxial inner conductor (8) is provided on the lower surface of the bottom cover plate (6). A coaxial outer conductor (7) is installed on the mounting base. The bottom ends of the coaxial inner conductor (8) and the coaxial outer conductor (7) are connected to the RF coaxial connector plug. The upper surface of the stepped ridge segment (4) base plate is integrally provided with a connecting block (41). The connecting block (41) has a threaded hole (42) that penetrates the bottom of the connecting block along the vertical direction. The threaded hole (42) is coaxially arranged with the coaxial inner conductor (8). The top of the coaxial inner conductor (8) extends out of the dielectric body (9) and enters the threaded hole (42) to be threadedly connected to the connecting block (41).

2. The high-power coaxial feed source as described in claim 1, characterized in that, The outer sides of the pair of arc-shaped ridge segments (5) are open in the lateral direction. The two side walls of the double-ridge trumpet opening segment (1) are provided with first strip windows (10) that match the height and width of the arc-shaped ridge segments (5) along the vertical central axis. The open end edges of the pair of arc-shaped ridge segments (5) are fixedly connected to the edge of the first strip window (10) on the same side. The stepped ridge segment (4) is open on the outer side and top. The ridge waveguide transformation segment (2) is installed on the side wall of the stepped ridge segment (4) with a second strip window (11) that matches the height and width of the stepped ridge segment (4) along the vertical central axis. The top of the second strip window (11) is connected to the bottom of the first strip window (10) on the same side. The edge of the outer side of the stepped ridge segment (4) is fixedly connected to the edge of the second strip window (11). The top edge of the stepped ridge segment (4) is fixedly connected to the bottom edge of the arc-shaped ridge segment (5) on the same side.

3. The high-power coaxial feed source as described in claim 1, characterized in that, The connecting block (41) has a vent hole (43) arranged vertically along the upper edge, which is coaxial with the threaded hole (42). The bottom end of the vent hole (43) is connected to the top end of the threaded hole (42), and the top end of the vent hole (43) passes through the top of the connecting block (41) and is connected to the outside.

4. The high-power coaxial feed source as described in claim 1, characterized in that, The dielectric body (9) includes an inner dielectric body (91) and an outer dielectric body (92). The inner dielectric body (91) is truncated cone-shaped. The bottom of the inner dielectric body (91) is close to the upper surface of the bottom cover plate (6), and the top of the inner dielectric body (91) is close to the lower surface of the connecting block (41). The top of the outer dielectric body (92) is integrally fixedly connected to the bottom of the inner dielectric body (91), and the bottom of the outer dielectric body (92) extends out of the bottom cover plate (6) to the bottom edge of the coaxial inner conductor (8).

5. The high-power coaxial feed source as described in claim 4, characterized in that, The taper of the inner medium (91) is in the range of 1:6 to 1:7; the height ratio of the inner medium (91) to the distance between the upper surface of the inner medium (91) and the lower surface of the connecting block (41) is 6:

1.

6. The high-power coaxial feed source as described in claim 1, characterized in that, The double-ridged trumpet opening section (1) includes an opening section (111) and a straight section (112). The vertical height ratio of the opening section (111) and the straight section (112) is 1:2, and the horizontal width ratio of the opening section (111) and the straight section (112) is 5:

8.

7. The high-power coaxial feed source as described in claim 1, characterized in that, The arc-shaped ridge segment (5) accounts for two-thirds of the overall height of the double-ridge trumpet opening segment (1), and the length ratio of the longitudinal width of the arc-shaped ridge segment (5) to the longitudinal width of the double-ridge trumpet opening segment (1) is 1:

6.

8. The high-power coaxial feed source as described in claim 1, characterized in that, The thickness of the stepped ridge section (4) is 20mm to 40mm. The stepped ridge section (4) includes a first step (44), a second step (45) and a third step (46) that are connected to each other. The height ratio of the first step (44), the second step (45) and the third step (46) is 13:11:5, and the lateral width ratio of the first step (44), the second step (45) and the third step (46) is 2:3:

8. The ratio of the longitudinal width of the stepped ridge segment (4) to the longitudinal width of the ridge waveguide transformation segment (2) is 1:

6.

9. The high-power coaxial feed source as described in claim 8, characterized in that, The ratio of the lateral width of the first step (44) of the stepped ridge segment (4) to the length of the lateral width of the bottom of the arc-shaped ridge segment (5) is 2:

3.

10. The high-power coaxial feed source as described in claim 1, characterized in that, The material of the dielectric body (9) is the same as that of the dielectric body of the radio frequency cable connector.

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