Feeder line suitable for high-power short-wave antenna and antenna feeder line system

Abstract

The invention discloses a feeder line suitable for a high-power short-wave antenna and an antenna feeder line system. The feeder line comprises a first branch feeder line, a second branch feeder line, a copper pipe main feeder line and an impedance matching section, wherein the first branch feeder line is connected with feeding points of two vibrators in the same column in the antenna unit; the two pairs of first branch feeders in the antenna units are connected in parallel through the second branch feeders; the copper pipe main feeder is connected with the second branch feeder through an impedance matching section, and four oscillators in the antenna unit are connected in parallel; wherein the first branch feeder line, the second branch feeder line and the copper pipe main feeder line which are connected with the high-frequency antenna unit and the low-frequency antenna unit have the same structure and different impedance matching sections; the impedance matching section connected with the high-frequency antenna unit adopts one-stage conversion, and the impedance matching section connected with the low-frequency antenna unit adopts two-stage conversion. According to the feeder line suitable for the high-power short-wave antenna and the antenna feeder line system disclosed by the invention, the limitation and defects of six-line arrangement are fundamentally solved.

Description

Technical Field

[0001] The present invention relates to the technical field of current sampling, and in particular to a feeder line and an antenna feeder line system suitable for a high-power short-wave antenna. Background Art

[0002] At present, the feeders suitable for high-power shortwave antennas mostly use a cable combination with settable impedance matching, that is, six wires, with a hollow copper tube structure. The main feeder uses six wires, and the six-wire feeder is a soft wire structure (six high-power cables with fixed spacing). It is necessary to plan the routing path. At the same time, a more complex electromagnetic environment will be generated between the six wires of the six-wire, and the signal stability and environmental interference are large. In order to meet the corresponding impedance matching, the spacing of the six wires needs to be more accurately controlled. Due to the use of a soft wire structure, it is difficult to arrange horizontal paths. For long distances and complex path arrangements, six-wire wiring needs to add a large number of positioning and fastening interfaces, which greatly increases the design cost and construction difficulty.

[0003] In the prior art, the invention patent with the patent publication number CN107732440A discloses an ultra-wideband high-gain beam-upward omnidirectional antenna, comprising a first broadband sub-array and a second broadband sub-array coaxially arranged on the same dielectric substrate, wherein the number of array elements of the first broadband sub-array and the second broadband sub-array are not equal, and the minimum number of array elements is 1, and the array elements are all U-shaped symmetrical oscillators, and a feeding wire is also provided on the dielectric substrate to connect the oscillators of the first broadband sub-array and the second broadband sub-array, and the first broadband sub-array and the second broadband sub-array are connected to a feeding cable through the feeding wire, and the characteristic impedances of the two sections of the feeding cable respectively connecting the first broadband sub-array and the second broadband sub-array are Z 01 and Z 02 , the input impedance Z of the first broadband sub-array and the second broadband sub-array in1 , Z in2 are equal to the characteristic impedance of the feeder cable, namely: Z 01 =Z in1 , Z 02 =Z in2 The feeder application in the prior art is a cable. Summary of the invention

[0004] The technical problem to be solved by the present invention is the limitations and disadvantages of the above-mentioned six-wire arrangement.

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

[0006] A feeder suitable for a high-power shortwave antenna comprises a first branch feeder 410, a second branch feeder 420, a copper tube main feeder 430 and an impedance matching section 450; wherein the first branch feeder 410 is connected to the feeding points 301 of two oscillators 300 in the same column in the antenna unit; the second branch feeder 420 connects two pairs of the first branch feeders 410 in the antenna unit in parallel; the copper tube main feeder 430 is connected to the second branch feeder 420 through the impedance matching section 450, and four oscillators 300 in the antenna unit are connected in parallel; wherein the first branch feeder 410, the second branch feeder 420 and the copper tube main feeder 430 connecting the high-frequency antenna unit 302 and the low-frequency antenna unit 303 have the same structure, but different impedance matching sections 450; the impedance matching section 450 connecting the high-frequency antenna unit 302 adopts a first-stage transformation, and the impedance matching section 450 connecting the low-frequency antenna unit 303 adopts a two-stage transformation.

[0007] In one embodiment of the present invention, in the low frequency band, the impedance matching section 450 includes a first impedance matching section 451 and a second impedance matching section 452; and the first impedance matching section 451 and the second impedance matching section 452 are both made of two copper tubes with equal spacing, and the copper tubes of the first impedance matching section 451 and the second impedance matching section 452 have equal diameters and different spacings.

[0008] In one embodiment of the present invention, the end of the first impedance matching section 451 is connected to the beginning of the second impedance matching section 452; and the beginning of the first impedance matching section 451 is connected to the second branch feeder 420 in the low frequency band, and the end of the second impedance matching section 452 is connected to the copper tube main feeder 430 in the low frequency band.

[0009] In one embodiment of the present invention, in the high frequency band, the impedance matching section 450 includes a third impedance matching section 453; one end of the third impedance matching section 453 is connected to the second branch feeder 420 in the high frequency band, and the other end is connected to the copper tube main feeder 430 in the high frequency band.

[0010] The present invention also provides an antenna feeder system, comprising the above-mentioned feeder suitable for high-power shortwave antennas, and also comprising a program switch 600, a phase shift switch 500 and an oscillator 300 connected in sequence; wherein the program switch 600 and the phase shift switch 500 are connected through a copper tube main feeder 430; the copper tube main feeder 430 coming out of the phase shift switch 500 is connected to an impedance matching section 450; and the first branch feeder 410 is connected to the oscillator 300.

[0011] In one embodiment of the present invention, four vibrators 300 are arranged in pairs as an antenna unit, and in the same antenna unit, the feeding points 301 of the two vibrators 300 in the same column are opposite to each other; the antenna system includes a high-frequency antenna unit 302 and a low-frequency antenna unit 303, and the vibrators 300 in the high-frequency antenna unit 302 and the low-frequency antenna unit 303 have the same structure but different sizes.

[0012] In one embodiment of the present invention, the vibrator 300 includes a horizontal tube 310, a vertical tube 320, a first arm folded tube 330 and a second arm folded tube 340; a pair of vertical tubes 320 are vertically connected to both ends of the horizontal tube 310; the first arm folded tube 330 and the second arm folded tube 340 are vertically connected to the pair of vertical tubes 320 respectively, and form a feeding gap 350; and the first arm folded tube 330 and the second arm folded tube 340 have the same structure, which is a multi-stage structure, and the closer to the feeding gap 350, the smaller the diameter of the arm folded tube is.

[0013] In one embodiment of the present invention, the phase shift switch 500 includes a phase shift switch frame 510, and a rotating switching contact device 5250 and a fixed contact device 5680 located in the phase shift switch frame 510; the fixed contact device 5680 is arranged around the rotating switching contact device 5250, and when the rotating switching contact device 5250 rotates, it is connected to the fixed contact devices 5680 at different positions.

[0014] In one embodiment of the present invention, the rotary switching contact device 5250 includes a power device 520, a rotating shaft 530, a phase shifting turntable 540 and an angle detection device 550; the power device 520 is fixedly located outside the phase shifting switch frame 510, the rotating shaft 530 is located inside the phase shifting switch frame 510, and is connected to the output end of the power device 520; the phase shifting turntable 540 is installed on the rotating shaft 530, and the angle detection device 550 is fixed at the end of the rotating shaft 530; the power device 520 drives the rotating shaft 530 to rotate, and at the same time drives the phase shifting turntable 540 and the angle detection device 550 to rotate in the same direction, and the angle detection device 550 feeds back the rotation angle information of the rotating shaft 530.

[0015] In one embodiment of the present invention, the phase shifting disk 540 is a regular pentagonal structure, and is disposed in a split manner, including a first sub-phase shifting disk and a second sub-phase shifting disk; each sub-phase shifting disk includes an insulating medium block 541, a spring connecting plate 542, a spring mounting block 543 and a contact spring 544;

[0016] The insulating medium blocks 541 of the two sub-phase shifting disks are symmetrically arranged;

[0017] The “L”-shaped spring connecting plate 542 of each sub-phase shifting disk is fixedly located on the outer edge of the insulating medium block 541 and wraps a corner of the insulating medium block 541; the head ends of the spring connecting plates 542 of the two sub-phase shifting disks are arranged at a certain angle with the shaft hole of the phase shifting disk 540 as the origin;

[0018] Both ends of each reed connecting plate 542 are provided with a reed mounting block 543, and the reed mounting block 543 is detachably connected to the contact reed 544, and the contact reed 544 on the reed mounting block 543 is arranged at a certain angle;

[0019] When the phase shifting disk 540 rotates, the center of gravity of the phase shifting disk 540 coincides with the center of gravity of the rotating shaft 530 , and the torque on the rotating shaft 530 is consistent at each rotation angle.

[0020] In one embodiment of the present invention, the fixed contact device 5680 includes a first sub-fixed contact device 561, a second sub-fixed contact device 562, a third sub-fixed contact device 563, a fourth sub-fixed contact device 564 and a fifth sub-fixed contact device 565; the first sub-fixed contact device 561 to the fifth sub-fixed contact device 565 are located on a circle with the rotating shaft 530 as the center and the maximum distance from the end of the contact spring 544 to the rotating shaft 530 minus the compression amount of the contact spring 544 as the radius, and are evenly distributed; and the fourth sub-fixed contact device 564 and the fifth sub-fixed contact device 565 are connected by a short-circuit plate 566.

[0021] In one embodiment of the present invention, each sub-fixed contact device includes an electrode contact block 570 and a porcelain rod 580; the electrode contact block 570 includes a fixed clamp 571 and an arc block 574; the non-contact surface A of the fixed clamp 571 protrudes to form a convex ear 572, and a straight semi-cylindrical groove 573 is also provided on the non-contact surface A of the fixed clamp 571, and the straight semi-cylindrical groove 573 passes through the convex ear 572; the arc block 574 is fixed on the non-contact surface A of the fixed clamp 571, and a semi-circular convex groove 575 is provided on the arc block 574, and the semi-circular convex groove 575 and the straight semi-cylindrical groove 573 overlap to form a porcelain rod through hole 576, and the porcelain rod 580 passes through the porcelain rod through hole 576 and is connected to the phase shift switch frame 510.

[0022] In one embodiment of the present invention, the contact surface B of the fixing clamp 571 faces the contact spring 544 , and the contact surface B of the fixing clamp 571 is arranged in an arc shape.

[0023] In one embodiment of the present invention, a pole piece mounting hole 5741 is provided on the arc block 574, and the fixed clamp 571 and the arc block 574 are detachably connected through the pole piece mounting hole 5741; and a feeder mounting hole 5721 is provided on the lug 572; the fixed contact device 5680 includes a feeder phase shift interface; through the feeder mounting hole 5721, the fixed contact device 5680 is detachably connected to the feeder phase shift interface; the feeder phase shift interface includes a feeder phase shift input interface 591, a first phase shift feeder connection port 592, a second phase shift feeder connection port 593, a third phase shift feeder connection port 594 and a feeder phase shift output interface 595.

[0024] Among them, the first sub-fixed contact device 561 is connected to the feeder phase-shift input interface 591, the second sub-fixed contact device 562 is connected to the first phase-shift feeder connection port 592; the third sub-fixed contact device 563 is connected to the second phase-shift feeder connection port 593, and the first phase-shift feeder connection port 592 and the second phase-shift feeder connection port 593 are connected through a feeder; the fourth sub-fixed contact device 564 is connected to the third phase-shift feeder connection port 594, and the second phase-shift feeder connection port 593 and the third phase-shift feeder connection port 594 are connected through a feeder; the fifth sub-fixed contact device 565 is connected to the feeder phase-shift output interface 595; the low-frequency antenna unit 303 and the program switch 600 are connected to the feeder phase-shift input interface 591 and the feeder phase-shift output interface 594 through the feeder 400.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adopts a full copper tube form, and its design path is not restricted by other six-wire soft cables. The main feeder is close to the tower ladder, and the first and second branch feeders are respectively located at corresponding positions inside the antenna frame. The design fully combines the distribution position of the antenna support frame and the accessibility of personnel for construction. While meeting the equal length design requirements and electrical performance requirements of each section, it greatly simplifies the construction difficulty and improves safety.

[0026] The double copper tube feeder structure has a simple surrounding electromagnetic field and strong resistance to environmental interference. The all-copper tube hard structure also improves the spatial layout freedom of the feeder.

[0027] The present invention takes into account the regional working mode of the sub-array composed of each antenna array surface. A flange splicing form is adopted between the main feed line and the phase shift switch to facilitate later maintenance. At the same time, since the entire path is long, in order to ensure convenient construction and later maintenance, segment nodes are designed at corresponding length positions.

[0028] The entire feeder layout adopts a full copper tube hard structure, and its connection with the frame is fixed with support parts for easy disassembly and separation.

[0029] The two arms of the folded vibrator are divided into three sections. The closer to the feeding gap, the smaller the diameter is, which reduces the moment at the free end and the deformation caused by gravity. On the other hand, the folded tube of the first arm and the folded tube of the second arm gradually become thinner from both ends to the middle, which also changes the characteristic impedance of this section, and realizes broadband matching through multi-level impedance gradient.

[0030] The phase-shifting switch can switch the feeder system between different phases by rotating the switching contact device. The two RF signals passing through the switching switch complete the phase change during the transmission process, thereby raising the antenna radiation elevation angle to achieve a "blind spot filling" effect in the near and medium range. The switching switch changes the RF signal phase by different amounts in different working modes, and the amount of elevation of the antenna radiation elevation angle also changes accordingly, thereby achieving a "blind spot filling" effect under different terrain and landform conditions. It can realize a variety of switching modes, with the advantages of simple structure, smooth switching action, reliable structure, and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic diagram of a feeder suitable for a high-power shortwave antenna according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of two-stage transformation of the impedance matching section of an embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the first-level transformation of the impedance matching section of an embodiment of the present invention.

[0034] Figure 4 Schematic diagram of an antenna array composed of high-frequency antenna units according to an embodiment of the present invention.

[0035] Figure 5 Schematic diagram of an antenna array composed of low-frequency antenna units according to an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of a feeder in a low-frequency antenna unit according to an embodiment of the present invention.

[0037] Figure 7 It is a schematic diagram of a feeder in a high-frequency antenna unit according to an embodiment of the present invention.

[0038] Figure 8 The figure is a schematic diagram of an antenna feeder system according to an embodiment of the present invention.

[0039] Fig. 9 FIG. 4 is a schematic diagram of an oscillator according to an embodiment of the present invention.

[0040] Fig.10 Schematic diagram of a phase shift switch according to an embodiment of the present invention.

[0041] Fig.11Schematic diagram of a rotary switching contact device according to an embodiment of the present invention.

[0042] Fig.12 FIG. 4 is a schematic diagram of a phase shifting disk according to an embodiment of the present invention.

[0043] Fig.13 Schematic diagram of a phase shifting disk from another perspective of an embodiment of the present invention.

[0044] Fig.14 It is a schematic diagram of a rotary switching contact device and a fixed contact device according to an embodiment of the present invention.

[0045] Fig.15 Schematic diagram of an electrode contact block and a porcelain rod according to an embodiment of the present invention.

[0046] Fig.16 FIG. 4 is a schematic diagram of an electrode contact block according to an embodiment of the present invention.

[0047] Fig.17 Schematic diagram of a power divider according to an embodiment of the present invention.

[0048] Figures 18 to 21 Schematic diagram of four working modes of the phase-shift switch according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] Example 1

[0052] See also Figures 1 to 7As shown, the present invention provides a feeder suitable for a high-power shortwave antenna, including a first branch feeder 410, a second branch feeder 420, a copper tube main feeder 430 and an impedance matching section 450. The first branch feeder 410 connects the feeding points 301 of two oscillators 300 in the same column in the antenna unit, and the second branch feeder 420 connects the two pairs of first branch feeders 410 in the antenna unit in parallel; the copper tube main feeder 430 is connected to the second branch feeder 420 through the impedance matching section 450, and the four oscillators 300 in the antenna unit are connected in parallel. The first branch feeder 410, the second branch feeder 420 and the copper tube main feeder 430 connecting the high-frequency antenna unit 302 and the low-frequency antenna unit 303 have the same structure, and the impedance matching section 450 is different. The impedance matching section 450 connecting the high-frequency antenna unit 302 adopts a first-stage transformation, and the impedance matching section 450 connecting the low-frequency antenna unit 303 adopts a two-stage transformation.

[0053] In this embodiment, the first branch feeder line 410 is made of copper alloy material. In each antenna unit, four first branch feeder lines 410 are used, and the length of each first branch feeder line 410 is equal. The second branch feeder line 420 is made of two copper tubes with equal spacing. In the low frequency band, the length of each second branch feeder line 420 is equal, and in the high frequency band, the length of each second branch feeder line 420 is equal. The copper tube main feeder line 30 is made of two copper tubes with equal spacing. And the length of the copper tube main feeder line 430 in the high frequency band is equal to that of the copper tube main feeder line 430 in the low frequency band. Figure 6 Shown is a feed line 400 in the low frequency band, Figure 7 Shown is a feed line 400 in the high frequency band.

[0054] In this embodiment, in the low frequency band, the impedance matching section 450 includes a first impedance matching section 451 and a second impedance matching section 452. The first impedance matching section 451 and the second impedance matching section 452 are both made of two copper tubes with equal spacing, and the copper tubes of the first impedance matching section 451 and the second impedance matching section 452 have equal diameters and different spacings.

[0055] In this embodiment, the end of the first impedance matching section 451 is connected to the beginning of the second impedance matching section 452. The beginning of the first impedance matching section 451 is connected to the second branch feeder 420 in the low frequency band, and the end of the second impedance matching section 452 is connected to the copper tube main feeder 430 in the low frequency band. The copper tube main feeder 430 in the low frequency band is connected to the phase shift switch 500 and the program switch 600.

[0056] In this embodiment, the smoothness of impedance transformation is calculated by electromagnetic simulation to determine the impedance of each stage of transformation, and then the copper tube spacing of the first impedance matching section 451 and the second impedance matching section 452 is determined according to the determined impedance. The copper tube spacing is determined by the following formula:

[0057]

[0058] In the formula, w is the impedance value, lg is the logarithmic function, D is the copper tube spacing, d is the copper tube diameter, and the parameters are known.

[0059] In this embodiment, in the high frequency band, the impedance matching section 450 includes a third impedance matching section 453. One end of the third impedance matching section 453 is connected to the second branch feeder 420 in the high frequency band, and the other end is connected to the copper tube main feeder 430 in the high frequency band. The copper tube main feeder 430 in the high frequency band is connected to the program switch 600 and the antenna tuning unit 700. The third impedance matching section 453 is made of two copper tubes with equal spacing, and the spacing between the copper tubes can also be determined by the above formula.

[0060] Example 2

[0061] See also Figure 8 As shown, the present invention also provides an antenna feeder system, including embodiment 1, and also including a program switch 600, a phase shift switch 500 and an oscillator 300 connected in sequence; wherein the program switch 600 and the phase shift switch 500 are connected through a copper tube main feeder 430; the copper tube main feeder 430 coming out of the phase shift switch 500 is connected to the impedance matching section 450; and the first branch feeder 410 is connected to the oscillator 300.

[0062] See also Fig. 9 As shown, in one embodiment of the present invention, the vibrator 300 is a hard composite folded vibrator formed by welding steel pipes. The antenna bandwidth is widened by adjusting the current distribution at the end of the vibrator 300. Four vibrators 300 are arranged in pairs as an antenna unit, and in the same antenna unit, the feeding points 301 of the two vibrators 300 in the same column are opposite. The antenna system includes a high-frequency antenna unit 302, see Figure 4 As shown, and the low frequency antenna unit 303, see Figure 5 The high frequency antenna unit 302 is fixedly connected to the lower end of the antenna frame 100, and the low frequency antenna unit 303 is fixedly connected to the upper end of the antenna frame 100. The vibrators 300 in the high frequency antenna unit 302 and the low frequency antenna unit 303 have the same structure but different sizes.

[0063] See also Fig. 9As shown, in one embodiment of the present invention, the vibrator 300 includes a horizontal tube 310, a vertical tube 320, a first arm folded tube 330 and a second arm folded tube 340. A pair of vertical tubes 320 are vertically connected to both ends of the horizontal tube 310, and the first arm folded tube 330 and the second arm folded tube 340 are respectively vertically connected to the pair of vertical tubes 320 to form a feeding gap 350. The first arm folded tube 330 and the second arm folded tube 340 have the same structure, which is a multi-stage structure, and the closer to the feeding gap 350, the smaller the diameter of the arm folded tube is. In this application field, since the ordinary folded vibrator cannot add a supporting structure near the feeding point, the dead weight of the folded vibrator separated from the two arms makes the vibrator easy to deform. The present invention divides the two arms separated from the folded vibrator into three sections, and the closer to the feeding gap 350, the smaller the diameter is, which reduces the moment of the free end and reduces the deformation caused by gravity. On the other hand, the first arm folded tube 330 and the second arm folded tube 340 gradually become thinner from both ends to the middle, which also changes the characteristic impedance of this section, and realizes broadband matching through multi-stage impedance gradient.

[0064] See also Figures 10 to 21 As shown, in one embodiment of the present invention, the phase-shift switch 500 includes a phase-shift switch frame 510, and a rotating switching contact device 5250 and a fixed contact device 5680 located in the phase-shift switch frame 510. The fixed contact device 5680 is arranged around the rotating switching contact device 5250, and when the rotating switching contact device 5250 rotates, it is connected with the fixed contact devices 5680 at different positions.

[0065] In one embodiment of the present invention, the rotary switching contact device 5250 includes a power device 520, a rotating shaft 530, a phase shifting disk 540 and an angle detection device 550. The power device 520 is fixedly located outside the phase shifting switch frame 510, the rotating shaft 530 is located inside the phase shifting switch frame 510, and is connected to the output end of the power device 520. The phase shifting disk 540 is installed on the rotating shaft 530, and the angle detection device 550 is fixed at the end of the rotating shaft 530. The power device 520 drives the rotating shaft 530 to rotate, and at the same time drives the phase shifting disk 540 and the angle detection device 550 to rotate in the same direction, and the angle detection device 550 feeds back the rotation angle information of the rotating shaft 530. Specifically, two phase shifting disks 540 are sleeved on the rotating shaft 530, and are present at a certain distance.

[0066] In the embodiment, the power device 520 is a combination of a servo motor and a reducer. The reducer has both electric drive and manual drive functions, and can be manually intervened when the servo system fails or is powered off. Specifically, the angle detection device 550 is an encoder.

[0067] In this embodiment, the phase shifting disk 540 is a regular pentagonal structure, which is arranged in a split manner, including a first sub-phase shifting disk and a second sub-phase shifting disk, and the rotating shaft 530 passes through the center of the regular pentagon. Each sub-phase shifting disk includes an insulating dielectric block 541, a spring connecting plate 542, a spring mounting block 543 and a contact spring 544. The insulating dielectric blocks 541 of the two sub-phase shifting disks are arranged symmetrically, and the "L"-shaped spring connecting plate 542 of each sub-phase shifting disk is fixed on the outer edge of the insulating dielectric block 541 and wraps a corner of the insulating dielectric block 541. The head ends of the spring connecting plates 542 of the two sub-phase shifting disks are arranged at a certain angle with the axial hole of the phase shifting disk 540 as the origin. In this embodiment, the angle is 144°.

[0068] In this embodiment, both ends of each reed connecting plate 542 are provided with a reed mounting block 543, and the reed mounting blocks 543 are detachably connected to the contact reeds 544, and the contact reeds 544 on the reed mounting blocks 543 are arranged at a certain angle. In this embodiment, the angle between the contact reeds 544 on two adjacent reed mounting blocks 543 is 72°.

[0069] In this embodiment, the insulating medium block 541 is made of epoxy glass cloth. The reed connecting plate 542 and the reed mounting block 543 are made of brass, which has good conductivity. The contact reed 544 is formed by bending beryllium bronze, so that the end of the contact reed 544 is designed to be a finger-like structure, which can ensure smooth switching action. Two sets of reed mounting blocks 543 are provided at both ends of each reed connecting plate 542, so that the contact reed 544 is installed in double layers, which can ensure good contact between the contact reed 544 and the fixed contact device 300. When the phase shifting turntable 540 rotates, the center of gravity of the phase shifting turntable 540 coincides with the center of gravity of the rotating shaft 530, and the torque on the rotating shaft 530 is consistent at each rotation angle.

[0070] In this embodiment, the fixed contact device 5680 includes a first sub-fixed contact device 561, a second sub-fixed contact device 562, a third sub-fixed contact device 563, a fourth sub-fixed contact device 564 and a fifth sub-fixed contact device 565. The first sub-fixed contact device 561 to the fifth sub-fixed contact device 565 are located on a circumference with the rotation axis 530 as the center and the maximum distance from the end of the contact spring 544 to the rotation axis 530 minus the compression amount of the contact spring 544 as the radius, and are evenly distributed. The fourth sub-fixed contact device 564 and the fifth sub-fixed contact device 565 are connected by a short-circuit plate 566.

[0071] In this embodiment, the compression amount of the contact spring 544 is 3 mm, and the compression amount can be adaptively adjusted according to the switching switches of different sizes. Similarly, the bending directions of the ends of multiple contact springs 544 are in the same direction, and the ends of multiple contact springs 544 are all on the circumference. In this embodiment, two sets of phase shifting discs 540 are arranged on the rotating shaft 530, and each set of phase shifting discs 540 is equipped with a set of fixed contact devices 5680 and feeder devices 400 to form two switching switches.

[0072] In this embodiment, each sub-fixed contact device includes an electrode contact block 570 and a porcelain rod 580. The electrode contact block 570 includes a fixed clamp 571 and an arc block 574. The non-contact surface A of the fixed clamp 571 is protruding to form a convex ear 572, and a straight semi-cylindrical groove 573 is also provided on the non-contact surface A of the fixed clamp 571, and the straight semi-cylindrical groove 573 passes through the convex ear 572. The arc block 574 is fixed on the non-contact surface A of the fixed clamp 571, and a semi-circular convex groove 575 is provided on the arc block 574. The semi-circular convex groove 575 and the straight semi-cylindrical groove 573 overlap to form a porcelain rod through hole 576. The porcelain rod 580 passes through the porcelain rod through hole 576 and is connected to the phase shift switch frame 510. The contact surface B of the fixed clamp 571 faces the contact spring 544, and the contact surface B of the fixed clamp 571 is arranged in an arc shape, which further ensures a smooth switching action.

[0073] In one embodiment of the present invention, the arc block 574 is provided with a pole block mounting hole 5741, and the fixed clamp 571 and the arc block 574 are detachably connected through the pole block mounting hole 5741. In addition, a feeder mounting hole 5721 is provided on the lug 572, and the fixed contact device 5680 includes a feeder phase shift interface. Through the feeder mounting hole 5721, the fixed contact device 5680 is detachably connected to the feeder phase shift interface. The feeder phase shift interface includes a feeder phase shift input interface 591, a first phase shift feeder connection port 592, a second phase shift feeder connection port 593, a third phase shift feeder connection port 594 and a feeder phase shift output interface 595.

[0074] Among them, the first sub-fixed contact device 561 is connected to the feeder phase shift input interface 591, and the second sub-fixed contact device 562 is connected to the first phase shift feeder connection port 592. The third sub-fixed contact device 563 is connected to the second phase shift feeder connection port 593, and the first phase shift feeder connection port 592 and the second phase shift feeder connection port 593 are connected through a feeder; the fourth sub-fixed contact device 564 is connected to the third phase shift feeder connection port 594, and the second phase shift feeder connection port 593 and the third phase shift feeder connection port 594 are connected through a feeder. The fifth sub-fixed contact device 565 is connected to the feeder phase shift output interface 595. The low-frequency antenna unit 303 and the program switch 600 are connected to the feeder phase shift input interface 591 and the feeder phase shift output interface 594 through the feeder 400.

[0075] In this embodiment, a power divider 596 is also provided on the phase shift switch 500, and the feeder phase shift input interface 591 on the two groups of electrode contact blocks 570 is connected to the power divider 596, and is respectively connected to the copper tube main feeder 430 in the two low-frequency antenna units 303 fixed on the second horizontal cross arm 152 through the power divider 596. The feeder phase shift output interface 595 on the two groups of electrode contact blocks 570 is respectively connected to the copper tube main feeder 430 in the two low-frequency antenna units 303 fixed on the third horizontal cross arm 153. And the program switch 600 is also connected to the phase shift switch 500 through the feeder phase shift input interface 591 and the feeder phase shift output interface 595.

[0076] In this embodiment, the RF signal is divided into two paths through the power divider 596, one path of the RF signal is directly transmitted to the two low-frequency antenna units 303 fixed on the second-layer horizontal cross arm 152, and the other path of the RF signal is transmitted to the two low-frequency antenna units 303 fixed on the third horizontal cross arm 153 through the switching switch. The two paths of RF signals that pass through the switching switch complete the change of phase during the transmission process, thereby raising the antenna radiation elevation angle to achieve a near- and medium-range "blind spot filling" effect. In different working modes, the amount of change in the RF signal phase is different, and the amount of raising the antenna radiation elevation angle also changes accordingly, thereby achieving a "blind spot filling" effect under different terrain and landform conditions.

[0077] See also Figures 1 to 20As shown, in one embodiment of the present invention, the phase shift switch 500 includes four working modes. In the first working mode, the feeder phase shift input interface 591 receives the radio frequency signal, and the radio frequency signal is transmitted to the first phase shift feeder connection port 592 along the reed connecting plate 542 and the contact reed 544 on the second sub-phase shift turntable, and then transmitted to the second phase shift feeder connection port 593 through the first phase shift feeder connection port 592, and then transmitted to the feeder phase shift output interface 595 through the third phase shift feeder connection port 594 and the short-circuit plate 566 and the reed connecting plate 542 and the contact reed 544 on the first sub-phase shift turntable, thereby affecting the corresponding antenna unit to realize the first beam phase change, see Fig.18 shown.

[0078] The second working mode: the control system sends a command to the rotation switching contact device 5250 to drive the rotating shaft 530 to rotate counterclockwise, and the angle detection device 550 feeds back the rotation angle of the rotating shaft 530 to the control system. When the rotating shaft 530 rotates to the specified position, it stops rotating; the feeder phase shift input interface 591 receives the RF signal, and the RF signal is transmitted along the spring connecting plate 542 and the contact spring 544 on the first sub-phase shift turntable to the feeder phase shift output interface 595, and then output to the corresponding antenna unit to realize the second beam phase change, see Fig.19 shown.

[0079] The third working mode: the control system sends instructions to the rotation switching contact device 5250 to drive the rotating shaft 530 to rotate counterclockwise, and the angle detection device 550 feeds back the rotation angle of the rotating shaft 530 to the control system. When the rotating shaft 530 rotates to the specified position, it stops rotating. The feeder phase shift input interface 591 receives the RF signal, and the RF signal is transmitted along the spring connection plate 542 and the contact spring 544 on the first sub-phase shift turntable to the first phase shift feeder connection port 592, and is transmitted through the first phase shift feeder connection port 592, the spring connection plate 542 on the second sub-phase shift turntable, the contact spring 544, the second phase shift feeder connection port 593, the third phase shift feeder connection port 594 and the short-circuit board 566 to the feeder phase shift output interface 595, and then output to the corresponding antenna unit to realize the third beam phase change, see Fig. 20 shown.

[0080] In the fourth working mode, the feeder phase shift input interface 591 receives the RF signal, and the sub-fixed contact device connected to the feeder phase shift input interface 591 is not connected to the rotation switching contact device 5250, and the transmission link is in a disconnected state. At this time, the RF signal cannot be input to the corresponding antenna unit. Fig.21 shown.

[0081] In one embodiment of the present invention, the program switch 600 is mainly used to control the transmission of feeder RF signals to different antenna units to realize the working modes of antenna unit arrays of different frequency bands and sizes, thereby realizing beam radiation from antenna arrays of different configurations to achieve the coverage of broadcast station signals in different spaces. In this embodiment, the program switch 600 is not improved and is a mature product on the market.

[0082] In one embodiment of the present invention, a shortwave broadcast transmitter transmits a signal. After the transmitted signal enters the antenna tuning unit, the standing wave is reduced by adjusting the capacitance and inductance in the antenna tuning unit. The adjusted signal is output through the antenna tuning unit and enters the balanced-unbalanced converter. The balanced-unbalanced converter converts the unbalanced signal into a balanced signal and inputs it into the program switch 600.

[0083] The program switch 600 can adjust different antenna modes so that the radio frequency signal is transmitted to different antenna units through the feeder 400. In the low frequency band, if the antenna beam is to be directed upward, the program switch 600 is first connected to the program switch 600 through the feeder, and then connected to different antenna units through the feeder. When the rotary switching contact device 5250 rotates, it is connected to the fixed contact device 5680 at different positions to change the phase of the antenna unit.

[0084] When working, the phase shift switch 500 selects four sub-arrays to work in phase superposition. If the broadcasting station signal requires near- to medium-range coverage, the rotary switching contact device 5250 rotates and connects with the fixed contact devices 5680 at different positions to connect the two low-frequency antenna units 303 at the lower end of the antenna frame 100, thereby reducing the length of the main feeder lines of the two low-frequency antenna units 303 and causing the two low-frequency antenna units 303 at the upper end of the antenna frame 100 to have a phase lag relative to the two low-frequency antenna units 303 at the lower end of the antenna frame 100. In this mode, the beam is raised upward to increase the gain of the antenna within a high elevation angle range, so that more energy is reflected back to the ground through the ionosphere, thereby achieving near- to medium-range enhanced coverage of the two low-frequency antenna units 303.

[0085] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0086] The above-described embodiments merely represent implementation methods of the invention. The protection scope of the present invention is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements may be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A feeder suitable for a high-power shortwave antenna, characterized in that: The invention comprises a first branch feeder (410), a second branch feeder (420), a copper tube main feeder (430) and an impedance matching section (450); wherein the first branch feeder (410) is connected to the feeding points (301) of two oscillators (300) in the same column in the antenna unit; the second branch feeder (420) connects two pairs of first branch feeders (410) in the antenna unit in parallel; the copper tube main feeder (430) is connected to the second branch feeder (420) via the impedance matching section (450); Four oscillators (300) in the antenna unit are connected in parallel; wherein the first branch feeder (410), the second branch feeder (420), and the copper tube main feeder (430) connecting the high-frequency antenna unit (302) and the low-frequency antenna unit (303) have the same structure, but different impedance matching sections (450); the impedance matching section (450) connecting the high-frequency antenna unit (302) adopts a first-stage transformation, and the impedance matching section (450) connecting the low-frequency antenna unit (303) adopts a two-stage transformation.

2. The feeder suitable for high-power shortwave antenna according to claim 1, characterized in that: In the low frequency band, the impedance matching section (450) comprises a first impedance matching section (451) and a second impedance matching section (452); and the first impedance matching section (451) and the second impedance matching section (452) are both made of two copper tubes with equal spacing, and the copper tubes of the first impedance matching section (451) and the second impedance matching section (452) have equal diameters and different spacings.

3. The feeder suitable for high-power shortwave antenna according to claim 1, characterized in that: The end of the first impedance matching section (451) is connected to the beginning of the second impedance matching section (452); and the beginning of the first impedance matching section (451) is connected to the second branch feeder (420) in the low frequency band, and the end of the second impedance matching section (452) is connected to the copper tube main feeder (430) in the low frequency band.

4. According to the feeder suitable for high-power shortwave antennas as claimed in claim 1, in the high frequency band, the impedance matching section (450) includes a third impedance matching section (453); one end of the third impedance matching section (453) is connected to the second branch feeder (420) in the high frequency band, and the other end is connected to the copper tube main feeder (430) in the high frequency band.

5. An antenna feeder system, characterized in that: A feeder suitable for a high-power shortwave antenna comprising any one of claims 1 to 4, and further comprising a program switch (600), a phase shift switch (500) and an oscillator (300) connected in sequence; wherein the program switch (600) and the phase shift switch (500) are connected via a copper tube main feeder (430); the copper tube main feeder (430) coming out of the phase shift switch (500) is connected to an impedance matching section (450); and the first branch feeder (410) is connected to the oscillator (300).

6. The antenna feeder system according to claim 5, characterized in that: Four vibrators (300) are arranged in pairs to form an antenna unit, and in the same antenna unit, the feeding points (301) of the two vibrators (300) in the same column are opposite; the antenna system comprises a high-frequency antenna unit (302) and a low-frequency antenna unit (303), and the vibrators (300) in the high-frequency antenna unit (302) and the low-frequency antenna unit (303) have the same structure but different sizes.

7. The antenna feeder system according to claim 5, characterized in that: The vibrator (300) comprises a horizontal tube (310), a vertical tube (320), a first arm folded tube (330) and a second arm folded tube (340); a pair of vertical tubes (320) are vertically connected to the two ends of the horizontal tube (310); the first arm folded tube (330) and the second arm folded tube (340) are respectively vertically connected to the pair of vertical tubes (320) to form a feeding gap (350); and the first arm folded tube (330) and the second arm folded tube (340) have the same structure, which is a multi-stage structure, and the closer to the feeding gap (350), the smaller the diameter of the arm folded tube.

8. The antenna feeder system according to claim 5, characterized in that: The phase-shift switch (500) comprises a phase-shift switch frame (510), and a rotating switching contact device (5250) and a fixed contact device (5680) located in the phase-shift switch frame (510); the fixed contact device (5680) is arranged around the rotating switching contact device (5250), and when the rotating switching contact device (5250) rotates, it is connected to the fixed contact devices (5680) at different positions.

9. The antenna feeder system according to claim 8, characterized in that: The rotary switching contact device (5250) comprises a power device (520), a rotating shaft (530), a phase shifting disk (540) and an angle detection device (550); the power device (520) is fixedly located outside the phase shifting switch frame (510), the rotating shaft (530) is located inside the phase shifting switch frame (510) and is connected to the output end of the power device (520); the phase shifting disk (540) is installed on the rotating shaft (530), and the angle detection device (550) is fixedly located at the end of the rotating shaft (530); the power device (520) drives the rotating shaft (530) to rotate, and at the same time drives the phase shifting disk (540) and the angle detection device (550) to rotate in the same direction, and the angle detection device (550) feeds back the rotation angle information of the rotating shaft (530).

10. The antenna feeder system according to claim 9, characterized in that: The phase shifting disk (540) is a regular pentagonal structure and is arranged in a split manner, comprising a first sub-phase shifting disk and a second sub-phase shifting disk; each sub-phase shifting disk comprises an insulating medium block (541), a spring connecting plate (542), a spring mounting block (543) and a contact spring (544); The insulating medium blocks (541) of the two sub-phase shifting disks are symmetrically arranged; The "L"-shaped spring connecting plate (542) of each sub-phase shifting disk is fixedly located on the outer edge of the insulating medium block (541) and wraps around a corner of the insulating medium block (541); the head ends of the spring connecting plates (542) of the two sub-phase shifting disks are arranged at a certain angle with the shaft hole of the phase shifting disk (540) as the origin; Both ends of each reed connecting plate (542) are provided with a reed mounting block (543), and the reed mounting block (543) is detachably connected to the contact reed (544), and the contact reed (544) on the reed mounting block (543) is arranged at a certain angle; When the phase shifting disk (540) is rotated, the center of gravity of the phase shifting disk (540) coincides with the center of gravity of the rotating shaft (530), and the torque on the rotating shaft (530) is consistent at each rotation angle.

11. The antenna feeder system according to claim 8, characterized in that: The fixed contact device (5680) comprises a first sub-fixed contact device (561), a second sub-fixed contact device (562), a third sub-fixed contact device (563), a fourth sub-fixed contact device (564) and a fifth sub-fixed contact device (565); the first sub-fixed contact device (561) to the fifth sub-fixed contact device (565) are located on a circle with the rotating shaft (530) as the center and the maximum distance from the end of the contact spring (544) to the rotating shaft (530) minus the compression amount of the contact spring (544) as the radius, and are evenly distributed; and the fourth sub-fixed contact device (564) and the fifth sub-fixed contact device (565) are connected via a short-circuit plate (566).

12. The antenna feeder system according to claim 11, characterized in that: Each sub-fixed contact device comprises an electrode contact block (570) and a porcelain rod (580); the electrode contact block (570) comprises a fixed clamp (571) and an arc block (574); the non-contact surface (A) of the fixed clamp (571) is protruding to form a convex ear (572), and a straight semi-cylindrical groove (573) is also provided on the non-contact surface (A) of the fixed clamp (571), and the straight semi-cylindrical groove (573) passes through the convex ear (572); the arc block (574) is fixedly located on the non-contact surface (A) of the fixed clamp (571), and a semi-circular convex groove (575) is provided on the arc block (574), and the semi-circular convex groove (575) and the straight semi-cylindrical groove (573) are overlapped to form a porcelain rod through hole (576), and the porcelain rod (580) passes through the porcelain rod through hole (576) and is connected to the phase shift switch frame (510).

13. The antenna feeder system according to claim 12, characterized in that: The contact surface (B) of the fixing clamp (571) faces the contact spring (544), and the contact surface (B) of the fixing clamp (571) is arranged in an arc shape.

14. The antenna feeder system according to claim 12, characterized in that: The arc block (574) is provided with a pole block mounting hole (5741), and the fixed clamp (571) and the arc block (574) are detachably connected through the pole block mounting hole (5741); and the lug (572) is provided with a feeder mounting hole (5721); the fixed contact device (5680) includes a feeder phase shift interface; through the feeder mounting hole (5721), the fixed contact device (5680) is detachably connected to the feeder phase shift interface; the feeder phase shift interface includes a feeder phase shift input interface (591), a first phase shift feeder connection port (592), a second phase shift feeder connection port (593), a third phase shift feeder connection port (594) and a feeder phase shift output interface (595); The first sub-fixed contact device (561) is connected to the feeder phase shift input interface (591), the second sub-fixed contact device (562) is connected to the first phase shift feeder connection port (592); the third sub-fixed contact device (563) is connected to the second phase shift feeder connection port (593), and the first phase shift feeder connection port (592) and the second phase shift feeder connection port (593) are connected via a feeder; the fourth sub-fixed contact device (564) is connected to the third phase shift feeder connection port (594), and the second phase shift feeder connection port (593) and the third phase shift feeder connection port (594) are connected via a feeder; the fifth sub-fixed contact device (565) is connected to the feeder phase shift output interface (595); the low-frequency antenna unit (303) and the program switch (600) are connected to the feeder phase shift input interface (591) and the feeder phase shift output interface (594) via a feeder (400).

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