X and Ka dual-frequency co-aperture composite antenna unit

Abstract

The present application relates to a kind of X and Ka dual-frequency common-aperture composite antenna unit, belong to antenna technical field, solve the problems of X and Ka composite antenna in prior art, low radiation efficiency, narrow bandwidth, large volume.The X and Ka dual-frequency common-aperture composite antenna unit of the present application, including X frequency band metal dipole antenna, the X frequency band metal dipole antenna includes metal dipole, mounting plate and printed board feed network, the metal dipole, mounting plate and printed board feed network are sequentially stacked in order from top to bottom.The present application adopts common-aperture composite form, greatly saves design space, realizes dual-frequency composite, has the characteristics of wideband, dual-frequency, high radiation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna, in particular to an X and Ka dual-frequency co-aperture composite antenna unit. BACKGROUND

[0002] At present, the X / Ka composite antenna under research is mainly composed of array elements and microstrip, microstrip and waveguide, which is limited by the form of antenna, has low radiation efficiency, narrow bandwidth and large volume, and is difficult to meet the needs of multi-scene, multi-task and miniaturization, so it is urgent to find an antenna form with wideband characteristics, high radiation efficiency and high space utilization. SUMMARY

[0003] In view of the above analysis, the embodiments of the present application aim to provide an X and Ka dual-frequency co-aperture composite antenna unit to solve the problems of low radiation efficiency, narrow bandwidth and large volume of the existing X and Ka composite antenna.

[0004] The present application provides an X and Ka dual-frequency co-aperture composite antenna unit, comprising an X-band metal dipole antenna, the X-band metal dipole antenna comprising a metal dipole, a mounting plate and a printed board feed network, the metal dipole, the mounting plate and the printed board feed network being stacked in order from top to bottom.

[0005] Further, the metal dipole comprises a first metal arm, a second metal arm and a metal cylinder, the first metal arm and the second metal arm being symmetrically arranged on both sides of the metal cylinder.

[0006] Further, the metal dipole further comprises a coaxial line, the upper end of the coaxial line being connected with the first metal arm.

[0007] Further, the upper end of the metal cylinder is provided with a strip-shaped slot, the strip-shaped slot being arranged along the length direction of the metal cylinder.

[0008] Further, the metal dipole further comprises a connecting plate, the connecting plate being arranged parallel below the first metal arm.

[0009] Further, the mounting plate is uniformly provided with first radiation slots, the first radiation slots being arranged in rows and columns.

[0010] Further, the mounting plate is provided with a mounting hole, the lower end of the metal cylinder is arranged in the mounting hole, and the mounting plate is connected with the connecting plate.

[0011] Further, the printed feed network comprises an upper layer ground plate, an upper dielectric substrate, a semi-cured sheet, a lower dielectric substrate and a lower layer ground plate connected in order from top to bottom.

[0012] Further, the printed feed network comprises a feed point pad connected with the lower end of the coaxial line and a strip line, one end of the strip line being connected with the feed point pad.

[0013] Further, the Ka frequency band waveguide slot antenna connected with the X frequency band metal dipole antenna is further included.

[0014] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0015] (1) The traditional dual-frequency composite antenna generally adopts a multi-resonant unit, and is mainly a microstrip antenna, and the radiation efficiency is low, and in the Ka frequency band, the radiation efficiency is only about 30%, and the present application has a radiation efficiency of more than 50% in the Ka frequency band, greatly improving the radiation efficiency of the antenna.

[0016] (2) The X frequency band metal dipole antenna is arranged above the Ka frequency band waveguide slot antenna, and is located in the middle of the top of the Ka frequency band waveguide slot antenna, and the two frequency band antennas are combined together, improving the aperture utilization rate and saving the design space.

[0017] (3) The X frequency band is in the form of a dipole antenna, and the Ka frequency band is in the form of a waveguide antenna, both frequency bands reach 4GHz bandwidth, and dual-frequency composite wideband optimization design is realized.

[0018] (4) The present application adopts a dipole and waveguide composite mode, and through reasonable optimization of the antenna layout, a common aperture composite form is adopted, which greatly saves the design space, realizes dual-frequency combination, and has the characteristics of wideband, dual-frequency and high radiation efficiency.

[0019] In the present application, the above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained from the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings are only for the purpose of illustrating specific embodiments and are not considered as limiting the present application, and in the whole drawings, the same reference signs represent the same parts;

[0021] Figure 1 It is a structure schematic view of the composite antenna unit of the specific embodiment;

[0022] Figure 2 It is a structure schematic view of the metal dipole of the specific embodiment;

[0023] Figure 3 It is a structure schematic view of the mounting plate of the specific embodiment;

[0024] Figure 4 Structure diagram of the upper floor structure for the specific embodiment;

[0025] Figure 5 Structure diagram of the printed board feed network for the specific embodiment;

[0026] Figure 6 Structure diagram of the upper dielectric substrate for the specific embodiment;

[0027] Figure 7 Structure diagram of the lower dielectric substrate for the specific embodiment;

[0028] Figure 8 Structure diagram of the prepreg for the specific embodiment;

[0029] Figure 9 Structure diagram of the radiation slot layer for the specific embodiment (1);

[0030] Figure 10 Structure diagram of the radiation slot layer for the specific embodiment (2);

[0031] Figure 11 Structure diagram of the power divider layer for the specific embodiment (1);

[0032] Figure 12 Structure diagram of the power divider layer for the specific embodiment (2);

[0033] Figure 13 Structure diagram of the adapter feed layer for the specific embodiment (1);

[0034] Figure 14 Structure diagram of the adapter feed layer for the specific embodiment (2);

[0035] Figure 15 Partial structure diagram of the composite antenna unit for the specific embodiment.

[0036] Reference signs:

[0037] 1-X band metal monopole antenna; 11-metal monopole; 111-first metal arm; 112-second metal arm; 113-metal cylinder; 114-metal inner core; 115-coaxial line; 116-strip slot; 117-connection plate; 118-first screw hole; 12-mounting plate; 121-first radiation slot; 122-mounting hole; 123-second screw hole; 13-printed board feed network; 131-upper floor; 1311-second radiation slot; 1312-first shielding post mounting hole; 1313-third screw hole; 132-lower floor; 1321-third radiation slot; 1322-second shielding post mounting hole; 1323-fourth screw hole; 133-upper dielectric substrate; 1331-fourth radiation slot; 1332-third shielding post mounting hole; 1333-fifth screw hole; 134-lower dielectric substrate; 1341-fifth radiation slot; 1342-fourth shielding post mounting hole; 1343-sixth screw hole; 135-prepreg; 1351-sixth radiation slot; 1352-fifth shielding post mounting hole; 1353-seventh screw hole; 136-metal shielding post; 137-feed point pad; 138-strip line;

[0038] 2-Ka band waveguide slot antenna; 21-radiation slot layer; 211-seventh radiation slot; 212-eighth screw hole; 213-resonant cavity; 214-first tuning boss; 22-power divider layer; 221-first 1-to-2 power divider; 222-second 1-to-2 power divider; 223-coupling slot; 224-second tuning boss; 23-adapting feed layer; 231-adapting slot; 232-adapting waveguide; 233-third tuning boss; 24-cover plate. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present application will be described in detail with reference to the drawings, in which:

[0040] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly defined and limited, the term "connected" should be interpreted broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0041] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0042] One specific embodiment of the present application, as shown in Figures 1-15 discloses an X and Ka dual-frequency co-aperture composite antenna unit, which comprises an X-band metal dipole antenna 1 and a Ka-band waveguide slot antenna 2. The X-band metal dipole antenna 1 and the Ka-band waveguide slot antenna 2 are stacked in order from top to bottom.

[0043] In this embodiment, the X-band metal dipole antenna 1 is fastened to the Ka-band waveguide slot antenna 2 by screws, and the X-band metal dipole antenna 1 and the Ka-band waveguide slot antenna are combined in a limited aperture size.

[0044] Specifically, the X-band metal dipole antenna 1 comprises a metal dipole 11, a mounting plate 12 and a printed board feed network 13. The metal dipole 11, the mounting plate 12 and the printed board feed network 13 are stacked in order from top to bottom. That is, the metal dipole 11 is above the mounting plate 12, and the printed board feed network 13 is below the mounting plate 12.

[0045] The metal dipole 11 comprises a first metal arm 111, a second metal arm 112 and a metal cylinder 113. The first metal arm 111 and the second metal arm 112 are symmetrically arranged on both sides of the metal cylinder 113, and the metal cylinder 113 is perpendicular to the first metal arm 111 and the second metal arm 112.

[0046] In this embodiment, the length, width and thickness of the first metal arm 111 and the second metal arm 112 are equal.

[0047] Further, the width of the first metal arm 111 is smaller than the diameter of the metal cylinder 113. The top surface of the first metal arm 111 is flush with the top surface of the metal cylinder 113.

[0048] The metal dipole 11 further comprises a metal inner core 114 and a coaxial line 115. The metal inner core 114 is arranged in the metal cylinder 113, and the coaxial line 115 is arranged in the metal inner core 114. The upper end of the coaxial line 115 is connected with the first metal arm 111 for transmitting energy.

[0049] In this embodiment, the length of the metal inner core 114 is smaller than the length of the metal cylinder 113, and the bottom of the metal inner core 114 is flush with the bottom of the metal cylinder 113. The diameter of the metal inner core 114 is equal to the inner diameter of the metal cylinder 113.

[0050] In order to adjust the dipole matching and expand the bandwidth, the upper end of the metal cylinder 113 is provided with a strip-shaped slot 116. There are two strip-shaped slots 116, and the plane where the two strip-shaped slots 116 are located is perpendicular to the first metal arm 111. In this embodiment, the strip-shaped slot 116 passes through the axis of the metal cylinder 113.

[0051] The metal oscillator 11 further includes a connecting plate 117. The connecting plate 117 is disposed parallel to the lower side of the first metal arm 111. The width of the connecting plate 117 is greater than the outer diameter of the metal cylinder 113. The lower end of the metal cylinder 113 passes through the middle position of the connecting plate 117 and exposes from the bottom surface of the connecting plate 117. The length of the connecting plate 117 is less than the sum of the lengths of the first metal arm 111 and the second metal arm 112.

[0052] In order to connect with the Ka-band waveguide slot antenna 2, two first screw holes 118 are provided on the connecting plate 117, and are respectively located at both ends of the connecting plate 117.

[0053] In this embodiment, the structure of the metal oscillator 11 is an inverted "tu" character structure. The metal oscillator 11 is a double-arm structure. The first metal arm 111 and the second metal arm 112 serve as the radiators of the metal oscillator 11 to radiate or receive electromagnetic waves.

[0054] The mounting plate 12 is made of metal material. Exemplarily, the mounting plate 12 is made of an aluminum plate.

[0055] A plurality of first radiation slots 121 are provided on the mounting plate 12. Specifically, the first radiation slots 121 are evenly distributed on the mounting plate 12, and multiple first radiation slots 121 form multiple rows and multiple columns on the mounting plate 12. In this embodiment, the first radiation slot 121 is a rectangular slot, and the four corners of the rectangle are chamfered. The first radiation slot 121 serves as the radiation slot of the Ka-band waveguide slot antenna 2.

[0056] Preferably, the number of the first radiation slots 121 is 16, 4 in each row and 4 in each column. The first radiation slots 121 in adjacent rows are aligned, and the first radiation slots 121 in adjacent columns are aligned.

[0057] A mounting hole 122 is provided on the mounting plate 12, and the mounting hole 122 is located at the center of the mounting plate 12. The mounting hole 122 is used to mount the metal cylinder 113, that is, the lower end of the metal cylinder 113 is disposed in the mounting hole 122.

[0058] Two second screw holes 123 are further provided on the mounting plate 12, and the two second screw holes 123 are respectively disposed on both sides of the mounting hole 122.

[0059] In this embodiment, screws are used to pass through the second screw holes 123 to connect with the metal oscillator 11. Specifically, the screws pass through the first screw holes 114 and the second screw holes 123 to fixedly connect the mounting plate 12 and the connecting plate 117.

[0060] The printed feed network 13 comprises an upper floor 131, a lower floor 132, an upper dielectric substrate 133, a lower dielectric substrate 134 and a prepreg 135, which are sequentially connected from top to bottom.

[0061] The upper floor 131 is provided with a plurality of second radiation slots 1311. Specifically, the second radiation slots 1311 are uniformly distributed on the upper floor 131, and a plurality of second radiation slots 1311 form a plurality of rows and columns on the upper floor 131. In this embodiment, the second radiation slots 1311 are rectangular slots, and the four corners of the rectangle are rounded.

[0062] Preferably, the number of second radiation slots 1311 is 16, 4 in each row and 4 in each column, and the second radiation slots 1311 of adjacent rows are aligned, and the second radiation slots 1311 of adjacent columns are aligned.

[0063] The upper floor 131 is provided with a plurality of first shielding column mounting holes 1312, which form a circle and are located at the center of the upper floor 131. The upper floor 131 is also provided with a third screw hole 1313, which is provided with two and is located on both sides of the circle formed by the first shielding column mounting hole 1312.

[0064] The lower floor 132 is provided with a plurality of third radiation slots 1321. Specifically, the third radiation slots 1321 are uniformly distributed on the lower floor 132, and a plurality of third radiation slots 1321 form a plurality of rows and columns on the lower floor 132. In this embodiment, the third radiation slots 1321 are rectangular slots, and the four corners of the rectangle are rounded.

[0065] Preferably, the number of third radiation slots 1321 is 16, 4 in each row and 4 in each column, and the third radiation slots 1321 of adjacent rows are aligned, and the third radiation slots 1321 of adjacent columns are aligned.

[0066] The lower floor 132 is provided with a plurality of second shielding column mounting holes 1322, which form a circle and are located at the center of the lower floor 132. The lower floor 132 is also provided with a fourth screw hole 1323, which is provided with two and is located on both sides of the circle formed by the second shielding column mounting hole 1322.

[0067] The upper dielectric substrate 133 is provided with fourth radiation slots 1331, and the fourth radiation slots 1331 are provided in plurality. Specifically, the fourth radiation slots 1331 are uniformly distributed on the upper dielectric substrate 133, and the plurality of fourth radiation slots 1331 form multiple rows and multiple columns on the upper dielectric substrate 133. In this embodiment, the fourth radiation slots 1331 are rectangular slots, and the four corners of the rectangle are rounded.

[0068] Preferably, the number of fourth radiation slots 1331 is 16, 4 in each row and 4 in each column, and the fourth radiation slots 1331 of adjacent rows are aligned, and the fourth radiation slots 1331 of adjacent columns are aligned.

[0069] The upper dielectric substrate 133 is provided with a plurality of third shielding column mounting holes 1332, and the plurality of third shielding column mounting holes 1332 form a circle and are located at the center of the upper dielectric substrate 133. The upper dielectric substrate 133 is also provided with fifth screw holes 1333, and the fifth screw holes 1333 are provided in two, respectively located on both sides of the circle formed by the third shielding column mounting holes 1332.

[0070] The lower dielectric substrate 134 is provided with fifth radiation slots 1341, and the fifth radiation slots 1341 are provided in plurality. Specifically, the fifth radiation slots 1341 are uniformly distributed on the lower dielectric substrate 134, and the plurality of fifth radiation slots 1341 form multiple rows and multiple columns on the lower dielectric substrate 134. In this embodiment, the fifth radiation slots 1341 are rectangular slots, and the four corners of the rectangle are rounded.

[0071] Preferably, the number of fifth radiation slots 1341 is 16, 4 in each row and 4 in each column, and the fifth radiation slots 1341 of adjacent rows are aligned, and the fifth radiation slots 1341 of adjacent columns are aligned.

[0072] The lower dielectric substrate 134 is provided with a plurality of fourth shielding column mounting holes 1342, and the plurality of fourth shielding column mounting holes 1342 form a circle and are located at the center of the lower dielectric substrate 134. The lower dielectric substrate 134 is also provided with sixth screw holes 1343, and the sixth screw holes 1343 are provided in two, respectively located on both sides of the circle formed by the fourth shielding column mounting holes 1342.

[0073] The prepreg 135 is provided with sixth radiation slots 1351, and the sixth radiation slots 1351 are provided in plurality. Specifically, the sixth radiation slots 1351 are uniformly distributed on the prepreg 135, and the plurality of sixth radiation slots 1351 form multiple rows and multiple columns on the prepreg 135. In this embodiment, the sixth radiation slots 1351 are rectangular slots, and the four corners of the rectangle are rounded.

[0074] Preferably, the number of sixth radiation slots 1351 is 16, 4 in each row and 4 in each column, and the sixth radiation slots 1351 of adjacent rows are aligned, and the sixth radiation slots 1351 of adjacent columns are aligned.

[0075] The prepreg 135 is provided with a plurality of fifth shielding post mounting holes 1352 which are arranged in a circle at the center of the prepreg 135. The prepreg 135 is also provided with a seventh screw hole 1353, and two seventh screw holes 1353 are arranged at the two sides of the circle formed by the fifth shielding post mounting holes 1352.

[0076] In the embodiment, the upper floor 131, the lower floor 132, the upper dielectric substrate 133, the lower dielectric substrate 134 and the prepreg 135 are all rectangular plates, and the corresponding second radiation slot 1311, the third radiation slot 1321, the fourth radiation slot 1331, the fifth radiation slot 1341 and the sixth radiation slot 1351 are vertically aligned with each other and with the first radiation slot 121; the corresponding first shielding post mounting hole 1312, the second shielding post mounting hole 1322, the third shielding post mounting hole 1332, the fourth shielding post mounting hole 1342 and the fifth shielding post mounting hole 1352 have the same diameter and are vertically aligned with each other; and the corresponding third screw hole 1313, the fourth screw hole 1323, the fifth screw hole 1333, the sixth screw hole 1343 and the seventh screw hole 1353 are vertically aligned with each other and with the second screw hole 123.

[0077] In the embodiment, the walls of the second radiation slot 1311, the third radiation slot 1321, the fourth radiation slot 1331, the fifth radiation slot 1341 and the sixth radiation slot 1351 are metallized, the upper floor 131 and the lower floor 132 are grounded, and the prepreg 135 bonds the upper dielectric substrate 133 and the lower dielectric substrate 134 together.

[0078] The printed board feed network 3 further comprises a metal shielding post 136, a feed point pad 137 and a strip line 138. The metal shielding post 136 is arranged in the shielding post mounting hole, the strip line 138 is made of metal copper material and is arranged between the upper dielectric substrate 133 and the lower dielectric substrate 134, one end of the strip line 138 is connected to the feed point pad 137, and the feed point pad 137 is connected to the lower end of the coaxial line 115.

[0079] In the embodiment, the X-band metal dipole antenna 1 is fixed on the metal dipole 1 by screws passing through the printed board feed network 3 and the mounting plate 2. The working principle of the X-band metal dipole antenna 1 is that when electromagnetic wave signals are fed by the strip line 138, the energy is transmitted upward through the coaxial line 115 and then radiated to the free space through the first metal arm 111 and the second metal arm 112.

[0080] In this embodiment, the wavelength ratio of the X-band metal dipole antenna 1 and the Ka-band waveguide slot antenna 2 is 1:4, and the X-band metal dipole antenna 1 is located in the middle of the Ka-band waveguide slot antenna 2.

[0081] The Ka-band waveguide slot antenna 2 includes a radiation slot layer 21, a power divider layer 22, and a transition feed layer 23, which are stacked in order from top to bottom and are all made of metal material and assembled together by vacuum brazing.

[0082] The radiation slot layer 21 is provided with a seventh radiation slot 211, and the seventh radiation slot 211 is provided in multiple. Specifically, the seventh radiation slot 211 is uniformly distributed on the radiation slot layer 21, and multiple seventh radiation slots 211 form multiple rows and multiple columns on the radiation slot layer 21. In this embodiment, the seventh radiation slot 211 is a rectangular slot, and the four corners of the rectangle are rounded.

[0083] Preferably, the number of seventh radiation slots 211 is 16, with 4 in each row and 4 in each column, and the seventh radiation slots 211 of adjacent rows are aligned, and the seventh radiation slots 211 of adjacent columns are aligned.

[0084] The top surface of the radiation slot layer 21 is provided with an eighth screw hole 212, and the eighth screw hole 212 is provided with two and is opposite to the seventh screw hole 1353. It should be noted that the eighth screw hole 212 is a blind hole.

[0085] The bottom surface of the radiation slot layer 21 is provided with a resonant cavity 213, and the resonant cavity 213 is provided with multiple, and in this embodiment, the resonant cavity 213 is provided with 4, and each resonant cavity corresponds to 4 seventh radiation slots 211 and is in communication with them. The side wall of the resonant cavity 213 is provided with a first tuning boss 214 for adjusting the Ka-band standing wave.

[0086] In this embodiment, the electromagnetic wave is mode-regularized in the resonant cavity 213, the high-order mode is cut off, the TE10 mode is transmitted along the Z-axis direction (the direction of the coaxial line 115) in the resonant cavity 213, and the longitudinal magnetic field component of the TE10 mode is transmitted upward, and the electromagnetic wave is radiated to the free space through the radiation slot.

[0087] The power divider layer 22 includes a first 1-to-2 power divider 221, a second 1-to-2 power divider 222, and a coupling slot 223, the first 1-to-2 power divider 221 is provided with two and is located on both sides of the second 1-to-2 power divider 222, the coupling slot 223 is provided with four, the four coupling slots 223 are located in the region of the first 1-to-2 power divider 221 two by two, and each coupling slot 223 corresponds to a resonant cavity 213 and is located in the middle of the resonant cavity 213. The side wall surface of the first 1-to-2 power divider 221 and the second 1-to-2 power divider 222 is provided with a second tuning boss 224.

[0088] In this embodiment, the first one-to-two power divider 221 and the second one-to-two power divider 222 are connected in parallel and correspond to the 16 seventh radiation slots 211 respectively.

[0089] The adapter feed layer 23 includes an adapter slot 231 and an adapter waveguide 232. The adapter slot 231 is arranged in the middle of the adapter feed layer 23 and communicates with the adapter waveguide 232. The adapter waveguide 232 is arranged at the bottom of the adapter feed layer 23.

[0090] In this embodiment, the adapter waveguide 232 is a rectangular waveguide, and the adapter slot 231 has a rectangular structure. The adapter slot 231 is located above the adapter waveguide 232. The adapter waveguide 232 and the adapter slot 231 together form a transmission structure. The signal enters the adapter slot 231 through the adapter waveguide 232, and then enters the one-to-two power divider of the power divider layer 22 for energy transmission.

[0091] A third tuning boss 233 is arranged on one side wall of the adapter waveguide 232. The position and size of the third tuning boss 233 are used to adjust the resonance of the Ka-band waveguide slot antenna 2.

[0092] The Ka-band waveguide slot antenna 2 further includes a cover plate 24 arranged below the adapter feed layer 23 for covering the adapter waveguide 232. It is worth noting that the adapter waveguide 232 communicates with one side wall of the adapter feed layer 23 for feeding signals to the adapter feed layer 23.

[0093] The working principle of the Ka-band waveguide slot antenna is as follows: when the electromagnetic wave signal is fed from the feed port of the adapter waveguide 232, the energy is coupled to the power divider layer 22 through the adapter slot 231. After two power divisions, the energy is evenly divided into four parts and enters the resonant cavity 213 through the coupling slot 223. In the resonant cavity 213, the TE10 mode is excited, and the electromagnetic wave is mode-reformed in the resonant cavity 213. The high-order mode is cut off, and the TE10 mode is transmitted along the Z-axis direction in the resonant cavity 213. The longitudinal magnetic field component of the TE10 mode radiates electromagnetic waves to the free space through the radiation slot.

[0094] The X-band metal dipole antenna 1 of this embodiment has a bandwidth of 4 GHz, a bandwidth of 40%, and a radiation efficiency of 60%. The Ka-band waveguide slot antenna 2 has a bandwidth of 4 GHz, a bandwidth of 11%, and a radiation efficiency of 62%. It meets the requirements of wideband characteristics, high radiation efficiency, and high space utilization.

[0095] The present application adopts a dipole and waveguide composite mode, optimizes the antenna layout reasonably, adopts a common aperture composite form, greatly saves the design space, realizes dual-frequency compounding, and has the characteristics of wideband, dual-frequency, and high radiation efficiency.

[0096] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An X and Ka dual-band co-boresight composite antenna unit, characterized in that, The X-band metal dipole antenna and the Ka-band waveguide slot antenna connected with the X-band metal dipole antenna are included, the X-band metal dipole antenna includes a metal dipole, a mounting plate and a printed board feed network, and the metal dipole, the mounting plate and the printed board feed network are sequentially stacked in order from top to bottom;The metal dipole includes a coaxial line, the printed board feed network includes a feed point pad, a strip line and an upper layer ground plate, an upper dielectric substrate, a prepreg, a lower dielectric substrate and a lower layer ground plate connected in order from top to bottom, the feed point pad is connected with the lower end of the coaxial line, and one end of the strip line is connected with the feed point pad; The Ka-band waveguide slot antenna includes a radiation slot layer, a power divider layer and a switching feed layer, the switching feed layer includes a switching slot and a switching waveguide, the switching slot is arranged in the middle of the top of the switching feed layer and communicates with the switching waveguide, and the switching waveguide is arranged at the bottom of the switching feed layer and vertically communicates with the switching slot;The switching waveguide and the switching slot jointly form a transmission structure, and signals enter the switching slot through the switching waveguide;One side wall of the switching waveguide is provided with a third tuning boss, and the position and size of the third tuning boss are used for adjusting the resonance of the Ka-band waveguide slot antenna.

2. The X and Ka dual-frequency co-antenna array unit according to claim 1, characterized in that, The metal dipole includes a first metal arm, a second metal arm and a metal cylinder, and the first metal arm and the second metal arm are symmetrically arranged on both sides of the metal cylinder.

3. The X and Ka dual-frequency co-antenna array unit according to claim 2, characterized in that, The upper end of the coaxial line is connected with the first metal arm.

4. The X and Ka dual-frequency co-antenna array unit of claim 2, wherein, The upper end of the metal cylinder is provided with a strip-shaped groove, and the strip-shaped groove is arranged along the length direction of the metal cylinder.

5. The X and Ka dual-frequency co-antenna array unit of claim 2, wherein, The metal dipole further includes a connecting plate, and the connecting plate is arranged in parallel below the first metal arm.

6. The X and Ka dual-frequency co-antenna array unit according to claim 5, characterized in that, The mounting plate is uniformly provided with first radiation slots, and the first radiation slots are arranged in rows and columns.

7. The X and Ka dual-frequency co-antenna-composite antenna unit according to claim 6, characterized in that, The mounting plate is provided with a mounting hole, the lower end of the metal cylinder is arranged in the mounting hole, and the mounting plate is connected with the connecting plate.

Images