CN109818114B - Compact high-power-capacity waveguide phase shifter and waveguide phase shifting method - Google Patents
Compact high-power-capacity waveguide phase shifter and waveguide phase shifting method Download PDFInfo
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Abstract
The invention provides a compact high-power-capacity waveguide phase shifter and a waveguide phase shifting method, aiming at solving the technical problems of very limited power capacity, large loss and large volume of the conventional high-power phase shifter. The waveguide phase shifter comprises a double circular polarizer and a choke piston; the double circular polarizer comprises a rectangular waveguide, a first square waveguide, a second square waveguide, a square-circle transition waveguide and a circular waveguide which are sequentially connected from bottom to top; the E surface of the first square waveguide is coupled to the top surface of the wide side of the rectangular waveguide, and a certain coupling angle is formed between the opening surface of the first square waveguide and the top surface of the wide side of the rectangular waveguide; two side surfaces in the first square waveguide are parallel to the opening surface of the rectangular waveguide; a rectangular metal matching structure is inserted into the rectangular waveguide below a coupling region with the first waveguide; the rectangular waveguide has the size meeting the requirement of only transmitting the fundamental mode TE10A mode; the size of the circular waveguide satisfies the TE of transmitting only the circular waveguide11A mode; the choke piston is arranged in the circular waveguide and is coaxial with the circular waveguide; one end face of the choking piston is provided with a metal pull rod connected with the servo motor.
Description
Technical Field
The invention relates to a high-power capacity transmission and emission passive device, in particular to a high-power capacity waveguide phase shifter and a waveguide phase shifting method.
Background
The microwave waveguide phase shifter is a common device in the technical field of microwave and millimeter wave, and has wide application in the fields of radar systems, communication systems, electronic countermeasure systems and the like, and the quality of the performance of the phase shifter can have an important influence on the system performance.
The conventional high-power phase shifter adopts ferrite materials such as Yttrium Iron Garnet (YIG) and the like, and adjusts the phase by changing the amplitude of an external magnetic field or electric field and changing the propagation constant of the ferrite materials. Since dielectric and ferrite materials are prone to breakdown under the action of a strong electromagnetic field, the power capacity of phase shifters is very limited, e.g., i.terechkine, t.khabbouline, and n.solyak, High-power L-base fast phase shfitter, Proceedings of LINAC 2008, Victoria, BC, canada, and r.madrak, d.sun, and d.willman, New materials and designs for High power fast phase shifter, Proceedings of LINAC 2006, Knoxville, usa, experimentally test High power phase shifters based on yttrium iron garnet with a breakdown threshold of 2.2MV/m and a power capacity below megawatt. However, ferrite materials such as YIG inevitably have losses, which affect efficiency. In addition, since the ferrite material has a large size, the phase shifter is generally operated at a low frequency of about 1GHz, and the phase shifter is bulky as a whole, and it is difficult to achieve miniaturization and high power capacity at a high frequency such as an X-band.
Disclosure of Invention
The invention provides a compact high-power-capacity waveguide phase shifter and a waveguide phase shifting method, aiming at solving the technical problems of very limited power capacity, large loss and large volume of the conventional high-power phase shifter.
The technical solution of the invention is as follows:
a compact high power capacity waveguide phase shifter is characterized in that: comprises a dual circular polarizer and a choke piston;
the double circular polarizer comprises a rectangular waveguide, a first square waveguide, a second square waveguide, a square-circle transition waveguide and a circular waveguide which are sequentially connected from bottom to top; two ports of the rectangular waveguide are used as two rectangular waveguide ports of the double circular polarizer; the port of the circular waveguide forms the circular waveguide port of the double circular polarizer;
the E surface of the first square waveguide is coupled to the top surface of the wide side of the rectangular waveguide, and a certain coupling angle beta is formed between the opening surface of the first square waveguide and the top surface of the wide side of the rectangular waveguide; two side surfaces in the first square waveguide are parallel to the opening surface of the rectangular waveguide;
in the rectangular waveguide, a rectangular metal matching structure is inserted below a coupling region with the first square waveguide, and the rectangular metal matching structure is closely adjacent to the narrow side surface of the rectangular waveguide;
the size of the rectangular waveguide is required to satisfy the requirement of transmitting only the fundamental mode TE10A mode; the size of the circular waveguide is required to satisfy the condition that only the circular waveguide TE can be transmitted11A mode;
the choking piston is arranged in the circular waveguide and is coaxially arranged with the circular waveguide; one end face of the choking piston is provided with a metal pull rod connected with the servo motor.
Furthermore, round chamfers are arranged at the connecting position of the rectangular waveguide and the first square waveguide, at the side edge of the second square waveguide and at the side edge of the rectangular metal matching structure on the narrow side face of the rectangular waveguide.
Further, the value range of the coupling angle beta is 25-35 degrees.
Further, the dimensions of the rectangular waveguide and the circular waveguide satisfy the condition:
c/2a<f1and c/a>f2，c/3.412r0<f1And c/2.613r0>f2
Wherein a is the width dimension of the rectangular waveguide; r is0Is the radius of the circular waveguide; c is the speed of light; f. of1And f2Respectively, the lower limit and the upper limit of the operating frequency of the phase shifter.
Furthermore, the first square waveguide, the second square waveguide, the square-circle transition waveguide and the circular waveguide are coaxially arranged.
Furthermore, the choke piston is of a three-section structure and comprises three cascaded metal cylinders, the lengths of the three metal cylinders are all quarter of the guided wave wavelength, the radiuses of the top metal cylinder and the bottom metal cylinder are the same and smaller than the radius of the circular waveguide, and the radius of the middle metal cylinder is smaller than the radiuses of the top metal cylinder and the bottom metal cylinder; the metal pull rod is arranged on the top end face of the top metal cylinder.
Further, the waveguide phase shifter adopts an all-metal structure.
The invention also provides a waveguide phase shifting method capable of realizing high power capacity, which is characterized by comprising the following steps:
1) connecting a rectangular waveguide, a first square waveguide, a second square waveguide, a square-round transition waveguide and a round waveguide from bottom to top in sequence, wherein the E surface of the first square waveguide is coupled to the top surface of the wide side of the rectangular waveguide, and the mouth surface of the first square waveguide and the top surface of the wide side of the rectangular waveguide form a certain coupling angle beta; two side surfaces in the first square waveguide are parallel to the opening surface of the rectangular waveguide; adding a choking piston in the circular waveguide; inserting a cuboid metal matching structure below a coupling region of the rectangular waveguide and the first square waveguide, wherein the cuboid metal matching structure is closely adjacent to the narrow side surface of the rectangular waveguide;
2) taking two ports of the rectangular waveguide as two rectangular waveguide ports of a double circular polarizer; the port of the circular waveguide forms the circular waveguide port of the double circular polarizer;
TE injection at one port of rectangular waveguide10Mode, TE injected by a choke piston in a circular waveguide10Totally reflecting the circularly polarized wave of the mode to form left-hand or right-hand circularly polarized TE11The mode is output from the other port of the rectangular waveguide;
3) and the position of the choke piston in the circular waveguide is changed to realize phase shifting.
The invention has the advantages that:
1. wide bandwidth
By adopting a travelling wave type coupling mechanism, a complex resonance matching structure is not provided, the relative bandwidth can reach more than 15 percent, and the bandwidth is far higher than that of a resonance type phase shifter.
2. Low loss
By adopting an all-metal structure, the return loss of an input port less than-20 dB and the transmission efficiency more than 99% can be realized within the bandwidth range of not less than 15%.
3. Compact structure
The transverse size of the phase shifter is less than one wavelength, and the phase shifter can be applied to a one-dimensional high-power phased array antenna.
4. High phase-shifting resolution
Assuming a piston travel distance resolution ofΔ d, circular waveguide TE11Mode guided wave length of lambdagThen resolution of phase shift
For example: when the moving resolution of the X-waveband piston is 0.1mm, the phase-shifting resolution of the phase shifter can reach 1.2 degrees.
5. The rectangular metal matching structure is arranged on the side surface of the narrow side close to the rectangular waveguide (matched with the groove cavity in the figure 10), and mainly has the following functions: when a single port of the rectangular waveguide is excited, two polarization directions TE for realizing excitation in the circular waveguide 15 can be adjusted11The amplitude of the mode is more consistent, and meanwhile, the energy input into one port of the rectangular waveguide 11 is not reflected, the other port of the rectangular waveguide is isolated, and TE in two polarization directions is realized11The mode phase difference remains unchanged at 90 °.
Drawings
FIG. 1 is a side view of a phase shifter of the present invention;
FIG. 2 is a front view of a phase shifter according to the present invention;
FIG. 3 is a schematic diagram of the intersection angle of a first square waveguide and a rectangular waveguide of the phase shifter of the present invention.
FIG. 4 is a rectangular E-plane and H-plane T-junction port3 excitation TE10Mode time vector magnetic field distribution, wherein (a) excites TE for E-plane T-junction port310Vector field distribution in mode, (b) T-junction excitation TE for H surface10The mode time vector magnetic field distribution.
FIG. 5 shows a T-junction with an E-plane and a T-junction with an H-plane S31The phase difference of (1).
FIG. 6 is an S-parameter curve for a dual circular polarizer.
FIG. 7 shows degenerate polarization TE of circular waveguide port of dual circular polarizer11The phase difference of the modes, i.e., arg (S (1:1,3: 2)) -arg (S (1:1,3: 1)).
Fig. 8 is an S-parameter curve of the phase shifter.
FIG. 9 is a graph of the output phase of the phaser as a function of piston travel distance.
FIG. 10 is a plot of the amplitude field of a dual circular polarizer when excited by a single rectangular waveguide port at an injection power of 1W.
Fig. 11 is a phase shifter amplitude field profile when a single rectangular waveguide port is excited with an injected power of 1W.
For the phase shifter, when 1W power is injected into the input port of the rectangular waveguide 11, the maximum field intensity of the surface of the phase shifter is 10kV/m, and the surface of the phase shifter is in a high vacuum condition (the vacuum degree is better than 1 multiplied by 10)-2Pa), and the power capacity of the phase shifter is not lower than 64MW calculated according to the air breakdown threshold of the metal surface of 80 MV/m.
The reference numbers in the figures illustrate:
11-rectangular waveguide, 12-first square waveguide, 13-second square waveguide, 14-square round transition waveguide, 15-round waveguide, 16-cuboid metal matching structure, and 17-round chamfer;
21-bottom metal cylinder, 22-middle metal cylinder, 23-top metal cylinder, and 24-metal pull rod;
port 1-port3 represent port numbers.
Detailed Description
As shown in fig. 1-3, the present invention provides a compact high power capacity waveguide phase shifter comprising a dual circular polarizer and a choke piston;
the dual circular polarizer has two rectangular waveguide ports (Port 1 and Port2 in fig. 1) and one circular waveguide Port (Port 3 in fig. 1); the double circular polarizer comprises a rectangular waveguide 11, a first square waveguide 12, a second square waveguide 13, a square-circle transition waveguide 14 and a circular waveguide 15 which are sequentially connected from bottom to top; in order to improve the transmission efficiency, the first square waveguide 12, the second square waveguide 13, the square-round transition waveguide 14 and the round waveguide 15 are coaxially arranged; two ports of the rectangular waveguide 11 form two rectangular waveguide ports of the dual circular polarizer; the output port of the circular waveguide 15 is used as the circular waveguide port of the double circular polarizer;
the E surface of the first square waveguide 12 is coupled to the wide top surface of the rectangular waveguide 11, and the mouth surface (the mouth surface refers to the plane where the port is located) of the first square waveguide 12 and the wide top surface of the rectangular waveguide 11 form a certain coupling angle β; the first waveguide 12 has two side surfaces parallel to the opening surface of the rectangular waveguide 11.
In the rectangular waveguide 11, below the coupling region with the first square waveguide 12, a rectangular metal matching structure 16 is inserted, which is a rectangular metal matching structure16 are adjacent to the narrow side of the rectangular waveguide 11; the rectangular metal matching structure 16 on the narrow side of the rectangular waveguide mainly has the following functions: when a single port of the rectangular waveguide 11 is excited, two polarization directions TE for realizing excitation in the circular waveguide 15 can be adjusted11The amplitude of the mode is more consistent, and meanwhile, the energy input into one port of the rectangular waveguide 11 is not reflected, the other port of the rectangular waveguide 11 is isolated, and TE in two polarization directions11The mode phase difference remains unchanged at 90 °.
The rectangular waveguide 11 is sized to transmit only the fundamental TE mode10Mode, other higher order modes are cut off; the size of the circular waveguide 15 is such that TE, a transmissive circular waveguide, is11Mode, other higher order modes are cut off. Other higher-order modes refer to TE20、TE01And the like. Specifically, let the dimensions of the wide side and the narrow side of the rectangular waveguide 11 be a and b, respectively, and the radius of the circular waveguide 15 be r0The lower limit and the upper limit of the operating frequency are respectively f1And f2And c is the speed of light, the following conditions need to be satisfied: c/2a<f1And c/a>f2，c/3.412r0<f1And c/2.613r0>f2。
Round chamfers 17 are arranged at the joint of the rectangular waveguide 11 and the first square waveguide 12, at the side edge of the second square waveguide 13 and at the side edge of the rectangular metal matching structure 16 on the side surface of the narrow side of the rectangular waveguide, so that the maximum field intensity on the surface of the rectangular metal matching structure is reduced, and the power capacity is improved.
The first and second square waveguides are both generalized square waveguides: that is, the two side lengths of the cross section do not need to be completely equal, so long as the TE in the waveguide capable of exciting two polarizations in the designed frequency range can be satisfied10Mode, and the higher-order mode is cut off.
The working principle of the double circular polarizer is as follows:
one port of the rectangular waveguide 11 injects the TE10Mode, TE of injection10The modes form left-hand or right-hand circularly polarized TE in the circular waveguide 1511Mode, no microwave output is in the other port of the rectangular waveguide 11. The reflection of one port of the input rectangular waveguide 11 is less than-20 dB, and the isolation between the other port of the input rectangular waveguide 11 and the other port of the input rectangular waveguide is more than 20dB(as shown in fig. 6 and 7).
The choke piston is arranged in the circular waveguide 15 and coaxially arranged with the circular waveguide 15, and a metal pull rod 24 for connecting with the servo motor is arranged on one end face of the choke piston. The choke piston preferably adopts a three-section structure and comprises three cascaded metal cylinders, the lengths of the three metal cylinders are all quarter of the guided wave wavelength, the radius of the top metal cylinder 23 and the radius of the bottom metal cylinder 21 are the same and are slightly smaller than the radius of the circular waveguide 15, and the radius of the middle metal cylinder 22 is smaller than the radius of the top metal cylinder 23 and the radius of the bottom metal cylinder 21; the end surface of the top metal cylinder 23 which is not connected with the middle metal cylinder 22 is also provided with a metal pull rod 24 for connecting with a servo motor. The choking piston with a three-section structure can ensure that the piston can realize an equivalent short circuit surface while moving quickly.
The working principle of the waveguide phase shifter is as follows:
a choking piston is added in a circular waveguide 15 at the top of the double circular polarizer to form an equivalent short-circuit surface, circular polarized waves in the circular waveguide 15 are totally reflected, the handedness of the reflected circular polarized waves is reversed to be right-handed circular polarized waves or left-handed circular polarized waves, the waves are output from the other port of the rectangular waveguide, and the reflection of the input port 11 of the rectangular waveguide is less than-20 dB. The position of the choke piston in the circular waveguide 15 is changed by a motor, so that the microwave transmission path can be changed, the output phase is changed, and the phase shift is realized. The choke piston moves one-half of the guided wave wavelength and a 360 degree phase shift can be achieved (as shown in figures 8 and 9).
The double circular polarizer is based on the following theoretical basis:
when the length of an input port is the same as the length of two rectangular waveguide walls, the phase difference of power division coefficients of the two T-shaped junctions is about 90 degrees within a certain frequency range (see figure 5), namely when the field intensity of the T-shaped junction power division port of the E-surface waveguide is the maximum amplitude value, the field intensity of the T-shaped junction power division port of the H-surface waveguide is the zero amplitude point.
The T-junction of the E-plane waveguide and the T-junction of the H-plane waveguide are combined because the TE with polarization degeneracy exists in the square waveguide10Mode, square waveguide and rectangleThe waveguides are coupled at a certain angle, and the coupling processes of the two polarization degenerate modes in the square waveguide and the two ports of the rectangular waveguide respectively represent the coupling processes of the T-shaped junctions of the E surface and the H surface. Wherein the TE is vertically polarized10The mode represents the coupling process of the H-plane T-junction and horizontally polarizes TE10The mode represents the coupling process of the E-plane T-junction. Let ports 1,2,3:1,3:2 represent two rectangular waveguide ports TE, respectively10Mode, vertically and horizontally polarized TE10Mode, the coupling angle of the square waveguide and the rectangular waveguide is adjusted, and two polarization degeneracy TEs can be realized10And (3) fully coupling the mode with the two-port fundamental mode of the rectangular waveguide: s (3: 1) is 0, S (3:1,1) is S (3:1,2) is 0.707, S (3: 2) is 0,
S(3：2,1)＝-S(3：2,2)，S(3：1,1)＝jS(3：2,1)。
two handedness circular polarized waves are injected into the square waveguide port:
(I) left-handed circularly polarized wave
Injecting a left-handed circularly polarized TE with amplitude of 1 into a square waveguide port located closer to the choke piston10Mode (2): 3:1 mode amplitude 0.707, phase 0 °; 3:2 mode amplitude 0.707, phase 90 °, port one output: 0.707S (3:1,1) +0.707S (3:2,1) ═ 0.5+0.5exp (-j90 ° + j90 °) 1, and the two-port output is 0.707S (3:1,2) +0.707S (3:2,2) ═ 0.5+0.5exp (-j90 ° -j90 °) 0.
(II) right-hand circularly polarized wave
Right-hand circularly polarized TE with square waveguide port injection amplitude of 110Mode (2): 3:1 mode amplitude 0.707, phase 90 °; the 3:2 mode amplitude is 0.707, phase is 0 °, port1 output is: 0.707(S (3:1,1)) +0.707S (3:2,1) ═ 0.5exp (j90 °) +0.5exp (-j90) ═ 0, and port2 output is 0.707S (3:1,2) +0.707S (3:2,2) ═ 0.5+0.5(-90 ° -90 °) = 0.
To sum up: TE injection into port one10Mode, energy all coupling into left-hand circularly polarized TE in square waveguide10Mode, the rectangular port two is isolated; TE injection in port two10Mode and energy are all coupled into square waveguide middle right-hand circular polarization TE10Mode(s).
The first square waveguide 12 and the rectangular waveguide 11 are at a certain angleThe angle beta is needed to be optimized so as to satisfy the requirement that TE with two polarization directions can be excited in the circular waveguide 15 when a single port of the rectangular waveguide 11 is excited11Modes (horizontal and vertical polarization), two TEs11The modes are substantially uniform in amplitude and the phase difference is approximately 90 in magnitude. If the angle beta is chosen too large, the vertical polarization TE excited in the circular waveguide 1511The mode amplitude will be greater than the horizontally polarized TE11Mode amplitude; angle beta is chosen to be too small, vertical polarization TE excited in circular waveguide 1511The mode amplitude will be less than the horizontally polarized TE11The amplitude of the mode. A large number of tests prove that the value range of the coupling angle beta is better between 25 and 35 degrees.
Specific design examples:
taking the center frequency of an X wave band of 9.5GHz as an example, the cross section of the rectangular waveguide 11 is 20.1mm multiplied by 9.8mm, the included angle beta between the first square waveguide 12 and the rectangular waveguide 11 is 31 degrees, the size of the first square waveguide 12 is 19.1mm multiplied by 18mm multiplied by 12mm, the size of the second square waveguide 13 is 22.2mm multiplied by 18.5mm multiplied by 6.3mm, the radius of the circular waveguide 15 is 10.55mm, the length of the square-circle transition 14 is 8mm, and the size of the rectangular metal matching structure 16 is 10mm multiplied by 7mm multiplied by 6 mm. The length of the metal cylinder 23 at the top of the choke piston is 12mm, the radiuses of the metal cylinder 21 at the bottom of the choke piston and the metal cylinder 23 at the top of the choke piston are both 8.5mm, and the radius of the metal cylinder 22 at the middle of the choke piston is 2.7 mm.
The double circular polarizer can realize that the reflection of the input port of the rectangular waveguide 11 is less than-20 dB in the range of 9-10.3GHz, the isolation between two ports of the rectangular waveguide 11 is better than 20dB, and the TE in two polarization directions of the circular waveguide 1511The magnitude of the phase difference between the modes is in the range of 90 ° ± 5 °.
The phase shifter can realize that the reflection of the input port of the rectangular waveguide 11 is less than-20 dB within the range of 8.8-10.2GHz, the movement distance of the choke piston is 30mm, and the phase shifting of 360 degrees can be realized. When the movement resolution of the choking piston is 0.1mm, the phase-shifting resolution of the phase shifter can reach 1.2 degrees.
As can be seen from FIGS. 10 and 11, in the phase shifter, when 1W of power is injected into the input port of the rectangular waveguide 11, the maximum field strength of the surface of the phase shifter is 10kV/m, and the phase shifter is operated in a high vacuum condition (the degree of vacuum is better than 1X 10)-2Pa) according to the air breakdown of the metal surfaceThe threshold value of 80MV/m is calculated, and the power capacity of the phase shifter is not lower than 64 MW.
Port 1:1 and Port 2:1 represent TE in two rectangular ports of a dual circular polarizer and a phase shifter, respectively10A mode;
port3:1 and Port3: 2 represent TE for polarization degeneracy in a dual circular polarizer circular waveguide port11Mode in which port3:1 represents vertically polarized TE11Mode, port3: 2 stands for horizontally polarized TE11Mode (parallel to the direction of port1 and 2 connections).
Claims (8)
1. A compact high power capacity waveguide phase shifter, characterized by: comprises a dual circular polarizer and a choke piston;
the double circular polarizer comprises a rectangular waveguide (11), a first square waveguide (12), a second square waveguide (13), a square-circle transition waveguide (14) and a circular waveguide (15) which are sequentially connected from bottom to top; two ports of the rectangular waveguide (11) are used as two rectangular waveguide ports of the double circular polarizer; the port of the circular waveguide (15) forms the circular waveguide port of the double circular polarizer;
the E surface of the first square waveguide (12) is coupled to the top surface of the wide side of the rectangular waveguide (11), and the opening surface of the first square waveguide (12) and the top surface of the wide side of the rectangular waveguide (11) form a certain coupling angle beta; two side surfaces in the first square waveguide (12) are parallel to the opening surface of the rectangular waveguide (11);
a rectangular metal matching structure (16) is inserted into the rectangular waveguide (11) below a coupling region with the first waveguide (12), and the rectangular metal matching structure (16) is closely adjacent to the narrow side surface of the rectangular waveguide (11);
the rectangular waveguide (11) is dimensioned such that it can transmit only the fundamental TE mode10A mode; the size of the circular waveguide (15) is such that only the circular waveguide TE can be transmitted11A mode;
the choke piston is arranged in the circular waveguide (15) and is coaxially arranged with the circular waveguide (15); one end face of the choking piston is provided with a metal pull rod (24) connected with the servo motor.
2. The compact high power capacity waveguide phase shifter of claim 1, wherein: round chamfers (17) are arranged at the joint of the rectangular waveguide (11) and the first square waveguide (12), at the side edge of the second square waveguide (13) and at the side edge of the rectangular metal matching structure (16) on the narrow side surface of the rectangular waveguide (11).
3. The compact high power capacity waveguide phase shifter of claim 1, wherein: the value range of the coupling angle beta is 25-35 degrees.
4. A compact high power capacity waveguide phase shifter according to any one of claims 1-3 wherein: the dimensions of the rectangular waveguide (11) and the circular waveguide (15) satisfy the condition:
c/2a<f1and c/a>f2，c/3.412r0<f1And c/2.613r0>f2
Wherein a is the width dimension of the rectangular waveguide (11); r is0Is the radius of the circular waveguide (15); c is the speed of light; f. of1And f2Respectively, the lower limit and the upper limit of the operating frequency of the phase shifter.
5. The compact high power capacity waveguide phase shifter of claim 4, wherein: the first square waveguide (12), the second square waveguide (13), the square-round transition waveguide (14) and the round waveguide (15) are coaxially arranged.
6. The compact high power capacity waveguide phase shifter of claim 5, wherein:
the choke piston is of a three-section structure and comprises three cascaded metal cylinders, the lengths of the three metal cylinders are quarter guided wave wavelengths, the radiuses of the top metal cylinder (23) and the bottom metal cylinder (21) are the same and smaller than the radius of the circular waveguide (15), and the radius of the middle metal cylinder (22) is smaller than the radiuses of the top metal cylinder (23) and the bottom metal cylinder (21); the metal pull rod (24) is arranged on the top end face of the top metal cylinder (23).
7. The compact high power capacity waveguide phase shifter of claim 6, wherein:
the waveguide phase shifter adopts an all-metal structure.
8. The waveguide phase shifting method capable of realizing high power capacity is characterized by comprising the following steps of:
1) sequentially connecting a rectangular waveguide (11), a first square waveguide (12), a second square waveguide (13), a square-round transition waveguide (14) and a round waveguide (15) from bottom to top, wherein the E surface of the first square waveguide (12) is coupled to the top surface of the wide side of the rectangular waveguide (11), and the mouth surface of the first square waveguide (12) and the top surface of the wide side of the rectangular waveguide (11) form a certain coupling angle beta; two side surfaces in the first square waveguide (12) are parallel to the opening surface of the rectangular waveguide (11); adding a choke piston in the circular waveguide (15); inserting a cuboid metal matching structure (16) below a coupling region with the first square waveguide (12) in the rectangular waveguide (11), wherein the cuboid metal matching structure (16) is closely adjacent to the narrow side surface of the rectangular waveguide (11);
2) two ports of the rectangular waveguide (11) are used as two rectangular waveguide ports of the double circular polarizer; the port of the circular waveguide (15) forms the circular waveguide port of the double circular polarizer;
TE is injected into one port of the rectangular waveguide (11)10Mode, TE injected by a choke piston in a circular waveguide (15)10Totally reflecting the circularly polarized wave of the mode to form left-hand or right-hand circularly polarized TE11The mode is output from the other port of the rectangular waveguide (11);
3) the position of the choke piston in the circular waveguide (15) is changed to realize phase shift.
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