CN113285199A - High-power waveguide power distribution feed circuit - Google Patents
High-power waveguide power distribution feed circuit Download PDFInfo
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- CN113285199A CN113285199A CN202110525824.0A CN202110525824A CN113285199A CN 113285199 A CN113285199 A CN 113285199A CN 202110525824 A CN202110525824 A CN 202110525824A CN 113285199 A CN113285199 A CN 113285199A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
Abstract
The invention belongs to the technical field of high-power microwaves, and particularly relates to a high-power waveguide power dividing feed circuit which is used for high-power microwave transmission and emission and comprises a power divider for high-power microwave array antennas, a power divider for one-N radial waveguides, N phase compensation sections, N arc E-surface 90-degree bent waveguides, N twisted waveguide direction adjustment sections and N phase adjustment sections, wherein N is more than or equal to 4 and is an even number, and the whole power divider is of an axisymmetric structure; the invention has the following technical effects: circular waveguide TM01Conversion to rectangular waveguide TE10The mode conversion efficiency is high, and other high-order modes are suppressed; the power capacity is high, and GW microwave signals can be borne; the structure is simple, the electric field polarization direction of the microwave signal can be adjusted to the same direction and the phase consistency of the output port only by bending the waveguide and twisting the waveguide; in addition, the requirement of coplanarity of the microwave input end and the microwave output end is met, the multiple output ends are arranged along the same straight line, and the polarization directions of electric fields are also in the same straight line direction.
Description
Technical Field
The invention belongs to the technical field of high-power microwaves, and particularly relates to a high-power waveguide power division feed circuit which is used for high-power microwave transmission and emission and comprises a high-power microwave array antenna feed.
Background
In order to obtain higher radiation gain, higher radiation efficiency and longer acting distance, a very effective approach is to use a large-scale array antenna to transmit high-power microwaves, and a waveguide power division feed circuit is a prerequisite for designing and realizing the high-power microwave array antenna.
In the field of high-power microwave antennas, it is generally required that a feed circuit of an array antenna has a high power capacity and a compact structure, and many researchers have studied the structure of a high-power waveguide power division feed circuit. The Xiang Qiang Li et al designed a high power helical array antenna based on radial line waveguide feed (X.Q.Li, Q.X.Liu, X.J.Wu, et al.A. GW level high-power radial line magnetic array antenna [ J ]. IEEE Transactions on Antennas and Propagation,2008,59(9):2943 and 2948.), and this feed structure converted the coaxial TEM mode into the TEM mode of radial line transmission through a double layer radial line waveguide, but this structure is only suitable for TEM mode transmission and cannot be used in other modes. Zhang hongwei et al designed a 1-branch 24-path power-division feed network structure (Zhang hongwei, Liu dynasty, Yunhua, etc., high-power phase-shifter-free self-rotation [ J ], strong laser and particle beam, 2018, 30 (07): 69-73) for realizing beam array antenna scanning, but the power-division feed circuit structure cannot be adapted to the application requirements that the central axes of a microwave input port and an output port are parallel to each other and coplanar; the doctor of the monte julian proposes a high-power planar multi-path power division feed circuit structure based on a fan-shaped waveguide (the study of the monte julian, a high-power microwave power division phase-shifting network and a leaky-wave array antenna [ D ], doctor academic thesis of Chinese science and technology university, 2018), however, the design realizes a phase modulation structure by adjusting the size of the wide edge of the waveguide, which is not beneficial to processing and is not convenient for multi-path expansion; the Roots Philippine design a planar rectangular grid array feed structure based on coupling feed of narrow-side slots of rectangular waveguide (Roots, high-power microwave novel scanning array antenna research [ D ], university of defense science and technology Philippine thesis, 2019), the feed structure is suitable for a high-power spiral array antenna, but the structural design of the power division feed circuit is complex.
The waveguide power dividing feed circuit is an important component in a high-power microwave transmission and emission system; the microwave power amplifier can distribute microwave input power to each branch according to a certain proportion, and ensure the excitation amplitude and phase required by each branch so as to realize the expected performance of a transmitting or transmission system; and secondly, the application requirements of the input port central axis and the output port central axis which are parallel and coplanar can be met. However, the existing waveguide feed circuit structure cannot simultaneously meet the requirements; therefore, a high power waveguide feed circuit structure is desired to solve the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a high-power waveguide power division feed circuit which can be used in the technical field of microwaves such as large-scale waveguide array antennas and the like, can meet the requirements that the central axes of an input port and an output port of a microwave transmission or emission system are parallel and coplanar, N output ports are arranged along the same straight line, the electric field polarization directions of the N output ports are on the same straight line, and the phases of the output ports are in the same phase.
In order to realize the requirements, the invention adopts the following technical scheme: a high-power waveguide power-dividing feed circuit comprises; the device comprises an N-path directional waveguide power divider, N phase compensation sections, N circular arc E-surface 90-degree bent waveguides, N twisted waveguide direction adjusting sections and N phase adjusting sections, wherein N is more than or equal to 4 and is an even number, and the whole device is of an axisymmetric structure; the one-to-N path waveguide power divider comprises a circular waveguide, a nose cone and N output ports, wherein the circular waveguide is used for connecting microwave source input signals, and the nose cone is used as a transition section and used for dividing the circular waveguide TM01Mode transition to a coaxial waveguide TEM mode; the N-path output port is a disc, and N-path rectangular slit windows are formed in the disc along the radial direction and are used for converting the coaxial waveguide TEM mode microwave signals back to TE10In the mode, the microwave power injected into the circular waveguide is output in the same phase and amplitude in N paths of radial shapes along the radial direction; the N phase compensation sections are standard rectangular waveguides and are respectively connected to N output ports of the one-to-N path waveguide power divider and used for compensating the phase of the phase adjustment section of the branch; the N arc E-surface 90-degree bent waveguides are used for connecting the phase compensation section and the twisted waveguide direction adjusting section and converting N path direction distributed signals output to the waveguide power divider from one N path to N path direction into axial distribution; the N twisted waveguide direction-adjusting sections are used for adjusting the polarization directions of the output electric fields of the N circular arc E-surface 90-degree bent waveguides to the same direction; the number of N isThe phase adjusting section is matched with the N phase compensation sections and is jointly used for adjusting the phase of the output signal of the high-power waveguide power division feed circuit so as to keep the phase of the output signal consistent; the output ports of the N phase adjusting sections are arranged in a straight line from top to bottom, and the polarization directions of electric fields are the same.
Further, a radius RC of a disc formed by the N output ports of the one-to-N radial waveguide power divider satisfies the following formula:
where a is the broadside length of a single output port.
Furthermore, the phase compensation section is a standard rectangular waveguide, the length of the wide side of the section of the phase compensation section is a, the length of the narrow side of the section of the phase compensation section is b, and the requirements that a is more than or equal to 12.96mm and less than or equal to 58.17mm and b is more than or equal to 6.48mm and less than or equal to 29.08mm are met; the length of N phase compensation sections is Lm, the Lm is adjusted according to the total phase path length of the phase adjustment sections, and m is [0,1,2,3, …, N/2 ].
Furthermore, the sections of the input port and the output port of the arc E-surface 90-degree curved waveguide are the same rectangle, the length of the wide side is the length a of the wide side of the section of the phase compensation section, the length of the narrow side is the length b of the narrow side of the section of the phase compensation section, and the turning radius is RE, so that RE is equal to or greater than 1.5 b.
Further, the twisted waveguide direction-adjusting section twists different angles according to the electric field polarization direction of the circular arc E-surface 90-degree bent waveguide output port: the first torsion waveguide direction adjusting section is 0 DEG torsion, and is used as the starting point, and the torsion is sequentially turned in the clockwise direction from the first torsion waveguide direction adjusting section to the Nth torsion waveguide direction adjusting section by (-360 DEG/N), (-2.360 DEG/N), (-3.360 DEG/N), …, [ - (m-1). 360 DEG/N ], (+ m.360 DEG/N), [ + (m-1). 360 DEG/N ], …, (+ 3.360 DEG/N), (+ 2.360 DEG/N), (+360 DEG/N); after the twisted waveguide direction adjusting section is twisted by an angle, different electric field polarization directions output by the output ports of the N circular arc E-surface 90-degree bent waveguides can be adjusted to be in the same direction.
Furthermore, the lengths of the central axes of the direction-adjusting sections of the twisted waveguides are equal and are LT, and LT is more than or equal to 70mm and less than or equal to 600 mm.
Further, the design process of the phase adjustment section is as follows:
the intervals of the adjacent output ports of the phase adjusting section are equal and are D, and D is more than or equal to 5mm and less than or equal to 30 mm;
the central axes of the phase adjusting sections are equal in length and are all LH, and the condition that LH is more than or equal to 150mm and less than or equal to 350mm is met;
establishing a Global coordinate system Global-xyz by using the center of the input port surface of the phase adjustment section, wherein the center of the port surface of the input port surface of the phase adjustment section projected in a Global-xoy plane and the center of the output port surface of the phase adjustment section meet the following formula:
the offset distance Δ my in the Global-y direction satisfies the following formula:
total length of offset path
Offset angle
Taking the Global coordinate system Global-xyz of the Global coordinate system Global-xyz as a reference, and taking the Global-xyz coordinate system Global-xyz as the offset angle
Rotating clockwise to obtain a local coordinate system Offset-xyz, wherein the N/2 phase adjusting sections are all similar curved waveguide structures and comprise two sections of arc lengths C1mAnd C2mAnd a length L3mThe bending curve of the standard rectangular waveguide of (1) is located in the Offset-xoz plane;
in OfArc length C in the fset-xoz plane1mThe starting point of the curved waveguide is located at the coordinate origin (0,0), the middle point is located at (-0.25. delta. mxy, -0.2. LH), and the end point is located at (-0.5. delta. mxy, -0.4. LH); arc length of C2mStarting point of the curved waveguide is C1mThe end points of the circular arc segment are positioned at the middle point (-0.75. delta. mxy, -0.625. LH) and the end points are positioned at the end points (-delta mxy, -0.85. LH) and have the length L3mStarting point of the standard rectangular waveguide is C2mThe end point of the circular arc segment is positioned at (-delta mxy, -LH) and satisfies L3m＝0.15·LH；
The bending curve is an arc curve, wherein the two arc curves both satisfy the following formula:
by substituting C1mCircular arc three-point coordinate and C2mThe three-point coordinates of the circular arc can be solved to obtain the circle center, the radius and the corresponding central angle of the circular arc curve; the circle centers of the two arc curves are respectively (A)1m，B1m) And (A)2m，B2m) Radius is R respectively1mAnd R2mCorresponding central angle theta1mAnd theta2mThe corresponding arc lengths are respectively C1mAnd C2mWherein the arc lengths of the two arc curves both satisfy the following formula:
further, the total length of the phase path of the phase adjustment section is C1m+C2m+L3m；
The invention has the following beneficial effects:
1. circular waveguide TM01Conversion to rectangular waveguide TE10The mode conversion efficiency is high, and other high-order modes are restrained.
2. The power capacity is high, and the microwave signal of GW magnitude can be borne.
3. The structure is simple, the electric field polarization direction of the microwave signal can be adjusted to the same direction and the phase consistency of the output port only by bending the waveguide and twisting the waveguide; in addition, the requirement of coplanarity of the microwave input end and the microwave output end is met, the multiple output ends are arranged along the same straight line, and the polarization directions of electric fields are also in the same straight line direction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a three-dimensional overall schematic diagram of an N-output high-power waveguide power division feed circuit according to an embodiment of the present invention;
fig. 2 is a top view of a high-power waveguide power-dividing feed circuit with N outputs according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a three-dimensional structure of a phase adjustment section of a power division feed circuit of a high-power waveguide according to an embodiment of the present invention;
fig. 4 is a three-dimensional schematic diagram of an overall structure of a sixteen-output high-power waveguide power-dividing feed circuit according to an embodiment of the present invention;
fig. 5 is a cross-sectional view of a radial waveguide power divider of a sixteen-output high-power waveguide power dividing feed circuit according to an embodiment of the present invention;
FIG. 6 is a graph of S-parameters for mode conversion and higher-order mode suppression provided by an embodiment of the present invention;
fig. 7 is a transmission coefficient graph of sixteen output ports according to an embodiment of the present invention;
fig. 8 is a graph of amplitude and phase of transmission coefficients at 8.4GHz, sixteen output ports according to an embodiment of the present invention;
reference numbers in fig. 1-3 indicate:
1-one-to-N path directional waveguide power divider: 11-circular waveguide, 12-nose cone and 13-N output ports; 2-a phase compensation section; 3-arc E surface 90-degree bend waveguide; 4-twisted waveguide direction-adjusting section: 41-a first twisted waveguide steering section, 42-a second twisted waveguide steering section, …, 4N-an nth twisted waveguide steering section; 5-phase adjustment section: 51-first phase adjustment segment, 52-second phase adjustment segment, …, 5N-nth phase adjustment segment.
Reference numbers in fig. 4-5 illustrate:
1-one-into-sixteen radial waveguide power divider: 11-circular waveguide, 12-nose cone and 13-sixteen output ports; 21-a first phase compensation segment, 22-a second phase compensation segment, …, 216-a sixteenth phase compensation segment; 3-arc E surface 90-degree bend waveguide; 41-a first (0 °) twisted waveguide steering segment, 42-a second (-22.5 °) twisted waveguide steering segment, …, 416-a sixteenth (+22.5 °) twisted waveguide steering segment; 51-a first phase adjustment segment, 52-a second phase adjustment segment, …, 516-a sixteenth phase adjustment segment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. For those skilled in the art, without any creative effort, other drawings and other embodiments can be obtained according to the drawings, and all of the embodiments belong to the protection scope of the present invention.
The following description will take the structure of a sixteen-output high-power waveguide power-dividing feed circuit as an example.
Fig. 3 is a schematic three-dimensional structure diagram of a phase adjustment section of a high-power waveguide power division feed circuit according to an embodiment of the present invention, fig. 4 is a schematic three-dimensional overall structure diagram of a sixteen-output high-power waveguide power division feed circuit according to an embodiment of the present invention, fig. 5 is a cross-sectional view of a radial waveguide power divider of a sixteen-output high-power waveguide power division feed circuit according to an embodiment of the present invention, and with reference to fig. 3, fig. 4, and fig. 5, the high-power waveguide power division feed circuit includes: the phase compensation device comprises a sixteen-branch radial waveguide power divider, 16 phase compensation sections, 16 circular arc E-surface 90-degree circular arc bent waveguides, 16 twisted waveguide direction adjustment sections and 16 phase adjustment sections, wherein sixteen output ports of the waveguide radial power divider are connected with input ports of the phase compensation sections, output ports of the phase compensation sections are connected with input ports of the circular arc E-surface 90-degree bent waveguides, output ports of the circular arc E-surface 90-degree bent waveguides are connected with input ports of the twisted waveguide direction adjustment sections, and output ports of the twisted waveguide direction adjustment sections are connected with input ports of the phase adjustment sections.
Specifically, the radial waveguide power divider comprises a circular waveguide (11), a nose cone (12) and a disc consisting of sixteen output ports (13);
furthermore, the radius RC of a disc formed by sixteen output ports of the radial waveguide power divider is 77.67mm, the length a of a wide side of a single output port is 28.5mm, and the height b is 12.6 mm;
further, the radius RIN of the circular waveguide is 32mm, and the height L0 is 40 mm;
further, the nose cone structure is composed of an inner three-segment cone and an outer two-segment cone, the radius R4 of the top of the inner cone is 10.83mm, the radius R3 of the top of the inner cone is 18.50mm, the height H3 of the inner cone is 26mm, the radius R2 of the middle cone is 34.26mm, the height H2 of the middle cone is 20.06mm, the radius R1 of the bottom of the inner cone is 52mm, and the height H1 of the bottom of the inner cone is 11.85 mm; the outer cone base radius R11-57 mm, R21-36.87 mm and height H11-21.39 mm and the top radius R31-32 mm and height H21-24.37 mm;
specifically, the one-to-sixteen radial waveguide power divider structure has axial symmetry, that is, the whole waveguide power division feed circuit structure also has axial symmetry, and only eight phase compensation segment lengths need to be adjusted;
specifically, the phase compensation section is a standard rectangular waveguide, and the length a of the wide side of the section is 28.5mm, and the length b of the narrow side is 12.6 mm;
further, the lengths of the phase compensation sections (21) and (29) are 50mm, the lengths of the phase compensation sections (22) and (210) are 50mm, the lengths of the phase compensation sections (23) and (211) are 40mm, the lengths of the phase compensation sections (24) and (212) are 32mm, the lengths of the phase compensation sections (25) and (213) are 28mm, the lengths of the phase compensation sections (26) and (214) are 33mm, the lengths of the phase compensation sections (27) and (215) are 45mm, and the lengths of the phase compensation sections (28) and (216) are 61 mm;
specifically, the sections of the input port and the output port of the sixteen circular arc E-surface 90-degree curved waveguides are the same rectangle, the length of the wide side is 28.5mm, the length of the narrow side is 12.6mm, and the length of the narrow side is 19 mm;
specifically, the twisted waveguide direction-adjusting section twists by different angles according to the electric field polarization direction of the circular arc E-surface 90 ° bent waveguide output port: said first twisted guiding section (41) is twisted (0 °), starting therefrom, and is twisted clockwise (-22.5 °), (-45 °), (-67.5 °), (-90 °), (-112.5 °), (-135 °), (-157.5 °), (+180 °), (+157.5 °), (+135 °), (+112.5 °), (+90 °), (+67.5 °), (+45 °), (+22.5 °), in that order up to said sixteenth twisted guiding section (416); the twisted waveguide direction adjusting section can adjust different electric field polarization directions of the output ports of the 16 arc E-surface 90-degree bent waveguides to the same direction through certain angle twisting;
further, the lengths of the central axes of the twisted waveguide direction-adjusting sections are equal and are LT (90 mm);
specifically, because the waveguide power dividing feed circuit structure has axial symmetry, only eight phase adjusting sections (51) to (58) need to be adjusted;
further, the vertical heights of the phase adjusting sections are equal and all LH is 273 mm;
furthermore, the cross sections of the input and output ports of the eight phase adjusting sections are all rectangular, the lengths of the wide sides of the input and output ports are 28.5mm, and the lengths of the narrow sides of the input and output ports are 12.6 mm;
specifically, the intervals between adjacent output ports of the sixteen phase adjusting sections are equal and D is 20 mm;
specifically, a Global coordinate system Global-xyz is established by using the center of the input port face of the phase adjustment section, the center of the port face of the phase adjustment section projected in a Global-xoy plane and the center of the output port face of the phase adjustment section, the offset distance in the Global-x axis direction is Δ mx, and the offset distance in the Global-y axis direction is Δ my, where m is [1,2,3, …,8 ];
furthermore, the first phase adjustment section (51) and the sixteenth phase adjustment section (516) are offset by a distance Δ 1x of 0mm, a distance Δ 1y of 93.03mm, and an offset angle
The second phase adjustment section (52) and the fifteenth phase adjustment section (515) are offset by a distance delta 2x of 57.97mm and a delta 2y of 71.96mm, and are offset by an angle
The third phase adjusting section (53) and the fourteenth phase adjusting section (514) are offset by a distance delta 3x of 61.18mm and a delta 3y of 29.19mm, and the offset angle is
The fourth phase adjustment section (54) and the thirteenth phase adjustment section (513) are offset by a distance delta 4x of 100.04mm and a distance delta 4y of 46.66mm, and the offset angle is
The fifth phase adjustment section (55) and the twelfth phase adjustment section (512) are offset by a distance delta 5x of 103.57mm and a delta 5y of 10.53mm, and the offset angle
The sixth phase adjustment section (56) and the eleventh phase adjustment section (511) are offset by a distance Δ 6x of 123.32mm, a distance Δ 6y of 30.42mm, and an offset angle
The seventh phase adjustment section (57) and the tenth phase adjustment section (510) are offset by a distance Δ 7x of 124.24mm and a distance Δ 7y of 2.56mm, and the offset angle is set to be smaller than the first angle
The eighth phase adjustment section (58) and the ninth phase adjustment section (59) are offset by a distance Δ 8x of 129.48mm and a distance Δ 8y of 16.30mm, respectively, and are offset by an angle of
Further, the Global coordinate system Global-xyz is set to the offset angle with reference to the Global-z coordinate axis in the Global coordinate system Global-xyz
Rotating clockwise to obtain a local coordinate system Offset-xyz;
specifically, the Offset angle of the first phase adjustment segment (51) and the sixteenth phase adjustment segment (516) within the local coordinate system Offset-xyz
Namely, two circular arc curves are positioned in the Offset-yoz plane of the local coordinate system, three-point coordinates of the curved circular arc are (0,0), (12.91, -54.81), (46.51, -100) and (46.51, -100), (80.21, -162.85), (93.02, -233), and coordinates of one line segment are (93.02, -233), (93.02, -273); two sections of circular arcs C11And C21Corresponding radius R11＝138.96mm，R21229.88mm, corresponding to an included angle theta1146.76 ° and θ2135.69 DEG, length L of a segment31＝40mm；
Specifically, in the plane of a local coordinate system Offset-xoz, the coordinates of three points of two curved circular arcs of the second phase adjustment segment (52) and the fifteenth phase adjustment segment (515) are (0,0), (-13.38, -58.62), (-46.20, -109) and (-46.20, -109), (-81.53, -166.44), (-92.40, -233), and the coordinates of a line segment is (-92.40, -233), (-92.40, -273); radius of arc R12＝171.26mm，R22174.26mm, corresponding to an included angle theta1240.44 ° and θ2244.63 °, length L of one segment32＝40mm；
Specifically, in the plane of the local coordinate system Offset-xoz, the three-point coordinates of two curved arcs of the third phase adjustment segment (53) and the fourteenth phase adjustment segment (514) are (0,0), (10.38, -56.64), (34.34, -109) and (34.34, -109), (59.67, -168.74), (68.69, -233), and the coordinates of one segment are (68.69, -233), (68.69, -273); radius of arc R13＝232.82mm，R23248.85mm, corresponding to an included angle theta1328.41 ° and θ23Length L of one line segment, 29.96 °33＝40mm；
Specifically, in the plane of the local coordinate system Offset-xoz, the coordinates of three points of two curved circular arcs of the fourth phase adjustment segment (54) and the thirteenth phase adjustment segment (513) are (0,0), (-15.80, -60.47), (-55.19, -109) and (-55.19, -109), (-97.33, -164.53), (-110.39, -233), and the coordinates of one segment is (-110.39, -233), (-110.39, -273); radius of arc R14＝147.72mm，R24152.65mm, corresponding to an included angle theta1448.86 ° and θ2452.79 DEG, length L of a segment34＝40mm；
Specifically, in the plane of the local coordinate system Offset-xoz, the three-point coordinates of two curved circular arcs of the fifth phase adjustment segment (55) and the twelfth phase adjustment segment (512) are (0,0), (14.94, -59.79), (52.05, -109) and (52.05, -109), (89.52, -166.20), (104.11, -233), and the coordinates of one segment are (-104.11, -233), (-104.11, -273); radius of arc R15＝154.60mm，R25188.41mm, corresponding to an included angle theta1545.99 ° and θ2541.82 deg., and a segment length L35＝40mm；
Specifically, in the plane of the local coordinate system Offset-xoz, the coordinates of three points of two curved circular arcs of the sixth phase adjustment segment (56) and the eleventh phase adjustment segment (511) are (0,0), (-18.15, -62.43), (-63.51, -109) and (-63.51, -109), (-108.13, -164.41), (-127.01, -233), and the coordinates of one line segment is (-127.01, -233), (-127.01, -273); radius of arc R16＝134.21mm，R26175.06mm, corresponding to an included angle theta1656.07 deg. and theta2646.89 DEG, length L of a segment36＝40mm；
Specifically, in the plane of the local coordinate system Offset-xoz, the three-point coordinates of two curved arcs of the seventh phase adjustment segment (57) and the tenth phase adjustment segment (510) are (0,0), (17.75, -62.09), (62.13, -109) and (62.13, -109), (106.98, -164.10), (124.27, -233), and the coordinates of one segment are (124.27, -233), (124.27, -273); radius of arc R17＝136.06mm，R27163.73mm, corresponding to an included angle theta1754.91 ° and θ2750.12 deg. and a segment length L37＝40mm；
Specifically, in the plane of the local coordinate system Offset-xoz, the coordinates of three points of two curved circular arcs of the eighth phase adjustment segment (58) and the ninth phase adjustment segment (59) are (0,0), (-18.65, -62.86), (-65.25, -109) and (-65.25, -109), (-113.63, -162.71), (-130.50, -233), and the coordinates of a line segment is (-130.50, -233), (-130.50, -273); radius of arc R18＝132.04mm，R28146.71mm, corresponding to an included angle theta1857.51 ° and θ2857.05 DEG, length L of a segment38＝40mm；
Fig. 5 is a cross-sectional view of a radial waveguide power divider of a sixteen-output high-power waveguide power-dividing feed circuit according to an embodiment of the present invention, where the radial waveguide power divider not only has a mode conversion function but also has a power division performance, and an input end of the radial waveguide power divider is a circular waveguide TM01Mode, output end being rectangular waveguide TE10Mode, the circular waveguide TM01The mode and the coaxial waveguide TEM mode have axial symmetry in field distribution, so that the coaxial TEM mode is adopted as a transition mode, the radial waveguide power divider is added with a nose cone at the tail end of the circular waveguide to form a transition section, and the circular waveguide TM is used01The mode is transited to a coaxial waveguide TEM mode, the coaxial waveguide TEM mode is transmitted along the radial direction, sixteen rectangular waveguide ports are formed at the radial tail end, microwaves are coupled and output through the rectangular waveguide ports, and the output mode is a rectangular waveguide TE10。
FIG. 6 is a graph of S-parameters for mode conversion and higher-order mode suppression in the 8.2-8.6GHz band for a circular waveguide TM01Return loss of mode RL (TM)01-TM01)<-20dB, input microwave with circular waveguide TM01Mode-excited, circular waveguide TM01Mode transfer to rectangular waveguide output higher order modes (TE)20、TE01) Transmission coefficient S (TM)01-TE20)<-100dB，S(TM01-TE01)<100dB, so the rectangular waveguide output port does not excite the higher order modes.
Fig. 7 is a graph of transmission coefficients of sixteen output ports, where the transmission coefficients of the sixteen output ports are distributed around-12.04 dB for IL, with-0.08 dB loss, and output is a constant amplitude signal in the 8.2-8.6GHz band.
Fig. 8 is a graph of amplitude and phase curves of transmission coefficients from the input port to sixteen output ports at 8.4GHz, where the phase difference between the sixteen output ports is better than ± 3.97 °, and the amplitude difference between the output ports is better than ± 0.08 dB.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications and alterations of the present invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high-power waveguide power division feed circuit is characterized in that: the device comprises an N-path directional waveguide power divider, N phase compensation sections, N circular arc E-surface 90-degree bend waveguides, N twisted waveguide direction adjusting sections and N phase adjusting sections, wherein N is more than or equal to 4 and is an even number, and the whole device is of an axisymmetric structure; the one-to-N path waveguide power divider comprises a circular waveguide, a nose cone and N output ports, wherein the circular waveguide is used for connecting microwave source input signals, and the nose cone is used as a transition section and used for dividing the circular waveguide TM01Mode transition to a coaxial waveguide TEM mode; the N-path output port is a disc, and N-path rectangular slit windows are formed in the disc along the radial direction and are used for converting the coaxial waveguide TEM mode microwave signals back to TE10In the mode, the microwave power injected into the circular waveguide is output in the same phase and amplitude in N paths of radial shapes along the radial direction; the N phase compensation sections are standard rectangular waveguides and are respectively connected to N output ports of the one-to-N path waveguide power divider and used for compensating the phase of the phase adjustment section of the branch; the N arc E-surface 90-degree bent waveguides are used for connecting the phase compensation section and the twisted waveguide direction adjusting section and converting N path direction distributed signals output to the waveguide power divider from one N path to N path direction into axial distribution; the N twisted waveguide direction-adjusting sections are used for outputting electric fields to N circular arc E-surface 90-degree bent waveguidesThe polarization directions of the two electrodes are adjusted to the same direction; the N phase adjusting sections are matched with the N phase compensating sections and are used for adjusting the phases of the output signals of the high-power waveguide power division feed circuit together so as to keep the phases of the output signals consistent; the output ports of the N phase adjusting sections are arranged in a straight line from top to bottom, and the polarization directions of electric fields are the same.
2. A high-power waveguide power splitting feed circuit according to claim 1, characterized in that: the radius RC of a disc formed by N output ports of the one-to-N radial waveguide power divider meets the following formula:
where a is the broadside length of a single output port.
3. A high-power waveguide power splitting feed circuit according to claim 1, characterized in that: the phase compensation section is a standard rectangular waveguide, the length of the wide side and the length of the narrow side of the section of the phase compensation section are respectively a and b, and a is more than or equal to 12.96mm and less than or equal to 58.17mm, and b is more than or equal to 6.48mm and less than or equal to 29.08 mm; the length of N phase compensation sections is Lm, which is adjusted according to the total phase path length of the phase adjustment section, and m is [1,2,3, …, N/2 ].
4. A high-power waveguide power splitting feed circuit according to claim 1, characterized in that: the sections of the input port and the output port of the arc E-surface 90-degree bent waveguide are the same rectangle, the length of the wide side is the length a of the wide side of the section of the phase compensation section, the length of the narrow side is the length b of the narrow side of the section of the phase compensation section, the turning radius is RE, and RE is more than or equal to 1.5 b.
5. A high-power waveguide power splitting feed circuit according to claim 1, characterized in that: the twisted waveguide direction adjusting section twists different angles according to the electric field polarization direction of the arc E surface 90-degree bent waveguide output port: the first torsion waveguide direction adjusting section is 0 DEG torsion, and is used as the starting point, and the torsion is sequentially turned in the clockwise direction from the first torsion waveguide direction adjusting section to the Nth torsion waveguide direction adjusting section by (-360 DEG/N), (-2.360 DEG/N), (-3.360 DEG/N), …, [ - (m-1). 360 DEG/N ], (+ m.360 DEG/N), [ + (m-1). 360 DEG/N ], …, (+ 3.360 DEG/N), (+ 2.360 DEG/N), (+360 DEG/N); after the twisted waveguide direction adjusting section is twisted by an angle, the different electric field polarization directions output by the output ports of the N arc E-surface 90-degree bent waveguides can be adjusted to be the same direction; the lengths of the central axes of the twisted waveguide direction-adjusting sections are equal and are LT, and LT is more than or equal to 70mm and less than or equal to 600 mm.
6. A high-power waveguide power splitting feed circuit according to claim 1, characterized in that: the design process of the phase adjustment section is as follows:
the intervals of the adjacent output ports of the phase adjusting section are equal and are D, and D is more than or equal to 5mm and less than or equal to 30 mm;
the central axes of the phase adjusting sections are equal in length and are all LH, and the condition that LH is more than or equal to 150mm and less than or equal to 350mm is met;
establishing a Global coordinate system Global-xyz by using the center of the input port surface of the phase adjustment section, wherein the center of the port surface of the input port surface of the phase adjustment section projected in a Global-xoy plane and the center of the output port surface of the phase adjustment section meet the following formula:
the offset distance Δ my in the Global-y direction satisfies the following formula:
total length of offset path
Offset angle
Taking the Global coordinate system Global-xyz of the Global coordinate system Global-xyz as a reference, and taking the Global-xyz coordinate system Global-xyz as the offset angle
Rotating clockwise to obtain a local coordinate system Offset-xyz, wherein the N/2 phase adjusting sections are all similar curved waveguide structures and comprise two sections of arc lengths C1mAnd C2mAnd a length L3mThe bending curve of the standard rectangular waveguide of (1) is located in the Offset-xoz plane;
in the Offset-xoz plane, the arc length is C1mThe starting point of the curved waveguide is (-a/2, -b/2), the middle point is (-0.25. delta. mxy, -0.2. LH), and the end point is (-0.5. delta. mxy, -0.4. LH); arc length of C2mThe starting point of the curved waveguide is (-0.5. delta. mxy, -0.4. LH), the middle point is (-0.75. delta. mxy, -0.625. LH), the end point is (-delta. mxy, -0.85. LH), and the length is L3mThe standard rectangular waveguide of (1) has a starting point at (- Δ mxy, -0.85. LH) and an ending point at (- Δ mxy, -LH), satisfying L3m＝0.15·LH；
The total length of the phase path of the phase adjustment section is C1m+C2m+L3m。
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