CN111525278B - Inverted ridge corrugated horn feed source antenna based on balanced feed - Google Patents
Inverted ridge corrugated horn feed source antenna based on balanced feed Download PDFInfo
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- CN111525278B CN111525278B CN202010309727.3A CN202010309727A CN111525278B CN 111525278 B CN111525278 B CN 111525278B CN 202010309727 A CN202010309727 A CN 202010309727A CN 111525278 B CN111525278 B CN 111525278B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
- H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
- H01Q19/132—Horn reflector antennas; Off-set feeding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
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Abstract
The invention relates to a reverse ridge corrugated horn feed source antenna based on balanced feed, which comprises a balanced feed structure, an axial corrugated groove, a conical horn wall, a cross reverse ridge, a circular truncated cone and a short circuit board, wherein the axial corrugated groove is formed in the middle of the balanced feed structure; the working bandwidth of the invention is an octave, such as 2-4GHz, within the working bandwidth, the wave beam width range is 50-70 degrees, and the invention has very low cross polarization level, and can be applied to a test system probe, in particular to a compact range feed source. The antenna has the advantages of wide frequency band, low return loss, wide wave beam, simple feed structure, easy processing and the like.
Description
Technical Field
The invention relates to a test system probe, in particular to the technical field of compact range feed sources, and specifically relates to an inverted ridge corrugated horn feed source antenna based on balanced feed.
Background
With the increasingly wide application of the reflector antenna in the fields of satellite communication, national defense, radio astronomy and the like, people put forward the requirements of wide frequency band, wide beam, low cross polarization and the like on the reflector antenna, and the feed source is used as the core component of the reflector antenna, so the performance of the feed source can directly influence the radiation performance of the transmitting surface antenna. The feed source antenna can provide a good spherical wave, and meanwhile, the feed source antenna is expected to have a low voltage standing wave ratio, a symmetrical radiation directional diagram, low side lobes, stable phase center, low cross polarization and high-performance broadband, and can solve the problems that the test process is complicated, the result is inaccurate and the like caused by frequently replacing the narrow-band feed source to achieve the broadband. Therefore, designing a wide-band high-performance feed antenna is significant for solving practical problems.
The waveguide ridge horn antenna is a commonly used antenna in the test field, and the bandwidth can usually reach more than 3 times of frequency, but some defects exist, for example, at high frequency, the antenna often has the situations of asymmetric directional diagram, narrow beam width, split main lobe, too large side lobe and the like, which seriously affects the precision during the test. In a wide frequency band range, the problems of large side lobe and narrow beam width of an antenna directional diagram of the conventional antenna are difficult to solve.
The balanced feed technology is commonly used in a circular waveguide horn antenna in the early stage, but is not commonly used in a ridged horn antenna, in 2014, Theunis S.Beukman et al designs a method for four-axis feed at the bottom of a four-ridged horn, and differential feed is performed on the four ridges, so that although a good matching effect is realized, the problems of asymmetry, splitting of a main lobe and large side lobe of the antenna occur in a directional diagram of the antenna, and certain difficulty exists in processing.
Therefore, the feed source antenna which is wide in frequency band, wide in beam and easy to process is designed to meet the requirements of a test system, and the feed source antenna has important practical significance.
Disclosure of Invention
The technical problems solved by the invention are as follows: overcome prior art's narrow bandwidth, narrow beam, directional diagram sidelobe big, and the not enough of current loudspeaker processing difficulty, provide a reverse ridge ripple loudspeaker feed antenna based on balanced feed, this feed antenna has the broadband, wide beam, and feed structure is simple, the outstanding advantage of easy processing.
The technical scheme adopted by the invention is as follows:
the invention relates to a reverse ridge corrugated horn feed source antenna based on balanced feed, which comprises a balanced feed structure 1, an axial corrugated groove 5, a conical horn wall 6, a cross reverse ridge 3, a circular truncated cone 7 and a short circuit board 2. The balanced feed structure 1 feeds in the equal-amplitude and opposite-phase differential signals from two opposite directions through the two coaxial probes 10, ensures the purity of a fundamental mode, and is easy to match. The cross-shaped inverted ridge 3 comprises four ridge pieces and a rectangular pyramid 14, the four ridge pieces are perpendicular to each other to form a cross shape, the top of the cross-shaped inverted ridge is connected with the rectangular pyramid 14, each ridge piece is divided into a feed section 8 and a transition section 9, the curve function of the transition section 9 of each ridge piece adopts the combination of an exponential function and a linear function, the inner conductor of the coaxial probe 10 of the balanced feed structure 1 is rotationally symmetrical with four connection points of the four ridge pieces in the cross-shaped inverted ridge 3, the excitation of a high-order mode is inhibited, meanwhile, the inverted ridge structure is favorable for matching the impedance at the opening face of the antenna with the impedance of a free space, the bandwidth of the antenna is expanded, and the stable phase center is favorably formed. The antenna is integrally equivalent to a typical three-port circuit, and impedance matching is realized at the third port through constant-amplitude reverse feeding of the two ports and an optimized inverted-ridge structure. Three grooves of the axial corrugated groove 5 are designed by matching with an inverted ridge structure of the extending port surface, and the width and the depth of the three grooves are adjusted, so that the beam width of the antenna 4 can be widened, and the cross polarization can be reduced.
In the inverted ridge corrugated horn feed source antenna based on balanced feed, a ridge piece of a cross inverted ridge 3 is composed of a feed section 8 and a transition section 9, the length of the lower end feed section 8 is 10-15 mm, the length electric size of the feed section 8 is 0.1 lambda-0.15 lambda, lambda is the wavelength corresponding to the central frequency of a designed frequency band, the ridge piece transition section 9 adopts the combination of an exponential function and a linear function, the optimization of a ridge curve is facilitated, the matching of the ridge and free space impedance is also facilitated, and the function expression is that y is 2e0.01x+0.0405x-2, x is the length of the ridge transition section 9, y is the shape of the ridge transition section 9 along with the change of the length x, the ridge thickness is between 7.75 and 8.15mm, the electrical size of the ridge thickness is between 0.0775 lambda and 0.0815 lambda, the total length of the cross-shaped inverted ridge 3 is between 255 and 265mm, and the electrical size of the total length of the cross-shaped inverted ridge 3 is between 2.55 lambda and 2.65 lambda.
In the inverted ridge corrugated horn feed antenna based on balanced feed, the cross inverted ridge 3 is positioned at the central position of the whole antenna and is higher than the horn mouth surface, after the cross inverted ridge 3 is loaded, an electric field is mainly distributed in a gap between the inverted ridge and the horn wall, a high-order mode is inhibited through the balanced feed, and the bandwidth of the feed antenna 4 is expanded.
In the inverted ridge corrugated horn feed source antenna based on balanced feed, the axial corrugated groove 5 comprising three grooves I, II, III 11, 12 and 13 is loaded at the horn mouth surface, and the axial corrugated groove 5 comprising three grooves I, II, III 11, 12 and 13 is loaded at the horn mouth surface of the conical horn wall 6; the widths of the first groove, the third groove and the third groove 11 and 13 are 6-15 mm, and the electrical size is 0.06 lambda-0.15 lambda; the width range of the second groove 12 is 18-23 mm, the electrical size range is 0.18-0.23 lambda, the depth of the innermost first groove 11 is 37.1-40.45 mm, the depth of the middle second groove 12 is 34.45-35.78 mm, the depth of the outermost third groove 13 is 30.475-32.79 mm, the electrical size ranges of the depths of the first, second, third grooves 11, 12 and 13 are 0.371-0.4045 lambda, 0.3445-0.3578 lambda and 0.30475-0.3279 lambda respectively, the wall thickness of the axial corrugated groove 5 is 1-1.325 mm, and the electrical size of the wall thickness is 0.01-0.01325 lambda. The designed depth and width of the slots one, two, three 11, 12, 13 can widen the beam width of the antenna and reduce cross polarization.
In the inverted ridge corrugated horn feed antenna 4 based on balanced feed, the outer conductor of the coaxial probe 10 of the balanced feed structure 1 is connected with the conical horn wall 6, and the inner conductor of the coaxial probe of the balanced feed structure 1 is connected with the feed section 8 of the cross inverted ridge 3.
In the inverted ridge corrugated horn feed source antenna based on balanced feed, the diameter of the opening surface of the conical horn wall 6 is 71.5-90.8 mm, the electrical size is 0.715-0.908 lambda, the length is 204-214 mm, the electrical size is 2.04-2.14 lambda, and the antenna has a good matching effect.
In the inverted ridge corrugated horn feed antenna based on balanced feed, PTFE is filled between an inner conductor and an outer conductor of a coaxial probe 10 of the balanced feed structure 1 of the antenna 4; the inner conductor and the outer conductor of the coaxial probe 10 of the balanced feed structure 1 of the antenna, the axial corrugated groove 5, the conical horn wall 6, the cross-shaped inverted ridge 3, the circular truncated cone 7 and the short circuit board 2 are made of metal, and the metal is selected from materials with high conductivity, and is usually any one metal or any combination of multiple metals of aluminum, iron, tin, copper, silver, gold or platinum.
In the inverted ridge corrugated horn feed source antenna based on balanced feed, inverted ridges are placed on a circular truncated cone 7 on a short circuit plate 2, the radius of the short circuit plate 2 is 35.775mm, the top radius of the circular truncated cone 7 is reduced to be more beneficial to matching of an antenna 4, but the top radius of the circular truncated cone 7 is too small to be beneficial to processing and manufacturing, finally, the top radius of the circular truncated cone 7 is 10.6-15.9 mm, the electric size is 0.106 lambda-0.159 lambda, the bottom radius is increased to be beneficial to stabilizing the structure of the antenna 4, the final bottom radius is 23.85-29.15 mm, and the electric size is 0.2385 lambda-0.2915 lambda.
In the inverted ridge corrugated horn feed source antenna based on balanced feed, the distance between the coaxial probe 10 of the balanced feed structure 1 and the short circuit board 2 is 0.23 lambda-0.25 lambda, so that reflection from the short circuit board can be eliminated, and a lower voltage standing wave ratio is formed.
The principle of the invention is as follows:
the invention is directed to a test system probe, particularly a broadband feed for compact ranges. The frequency coverage range of the feed source is 2-4 GHz. The whole set of the invention comprises a balanced feed structure 1, an axial corrugated groove 5, a conical horn wall 6, a cross-shaped inverted ridge 3 and a short circuit board 2. The invention uses the balanced feed structure 1 to feed in the equal-amplitude and opposite-phase differential signals from two opposite directions through two coaxial probes 10, the outer conductor of the coaxial probe 10 is connected with the horn wall 6, the inner conductor is connected with the cross-shaped inverted ridge 3, the distance between the horn wall 6 and the cross-shaped inverted ridge 3 at the center is changed by properly adjusting the inner diameter of the horn, and the distance between the feed point and the short-circuit board 2 is adjusted, thereby ensuring the purity of a basic mode during excitation, inhibiting the generation of high-order modes, achieving a good matching effect, greatly reducing the echo loss of the horn, improving the standing wave performance of the horn, simultaneously properly optimizing the ridge curve, being beneficial to matching the impedance at the opening surface of the antenna with the impedance of a free space, and greatly expanding the working bandwidth of the horn. The antenna is integrally equivalent to a typical three-port circuit, and impedance matching is realized at the third port through constant-amplitude reverse feeding of the two ports and an optimized inverted-ridge structure. To fit the inverted ridge structure of the outlet face, three axial corrugation grooves 5 are loaded at the mouth face position of the horn. The depth of the corrugated groove is about one fourth of lambada c (lambada c is the wavelength corresponding to the lowest frequency), the width of the three grooves is designed to be wider in the middle, the two sides are narrower, the beam width can be well controlled, the effect of wide beams is achieved, the beam range can be stabilized between 50 degrees and 70 degrees, meanwhile, due to the existence of the corrugated groove, the electric field distribution of the mouth surface is compressed towards the center, the cross polarization level of the loudspeaker is reduced, and the cross polarization water average is more than 33dB in the plus and minus 12-degree opening angle range on the whole frequency band.
Compared with the prior art, the invention has the advantages that:
(1) the working bandwidth of the invention is an octave, such as 2-4GHz, within the working bandwidth, the wave beam width range is 50-70 degrees, and the invention has very low cross polarization level, and can be applied to a test system probe, in particular to a compact range feed source. The antenna has the advantages of wide frequency band, low return loss, wide wave beam, simple feed structure, easy processing and the like. According to the invention, equal-amplitude and opposite-phase differential signals are fed in from two opposite directions through the two coaxial probes, the outer conductor of the coaxial probe is connected with the outer wall of the horn, the inner conductor is connected with the cross-shaped inverted ridge, the reflection generated by feeding is reduced, the purity of the basic mode is ensured, a good matching effect is achieved, and the feeding structure is simple and is easy to process. The contact surface of the connecting position of the ridge sheet and the horn wall in the traditional four-ridge waveguide horn is small, the influence of the horn wall and assembly is easy to realize, the precision of the gap between the middle four ridges is difficult to guarantee, and the wave impedance and the mode purity of the four-ridge waveguide are easily influenced.
(2) The cross inverted ridge is formed by four ridge pieces and a rectangular pyramid, the curve function of the transition section of the ridge piece adopts the combination of an exponential function and a linear function, the inner conductor of the coaxial probe for balanced feed is rotationally symmetrical with four connecting points of the four ridge pieces in the cross inverted ridge, the excitation of a high-order mode is inhibited, and meanwhile, the inverted ridge structure is beneficial to matching of impedance at the opening surface of the antenna with impedance of a free space, the bandwidth of the antenna is expanded, and a stable phase center is favorably formed.
(3) The inverted ridge at the center is beneficial to matching the impedance at the antenna aperture surface with the impedance of a free space, the inverted ridge is located at the center, the field control capability is enhanced, the electric field is mainly distributed in a gap between the inverted ridge and the horn wall, a high-order mode is inhibited through balanced feed, and the bandwidth of the antenna is expanded.
(4) The widths and the depths of three grooves of the axial corrugated groove are different, and the axial corrugated groove is mainly used for adjusting the beam width of the antenna and reducing cross polarization. The axial corrugated grooves of the three grooves are loaded on the wall opening surface of the conical horn, the width and the depth of the grooves are respectively adjusted, the antenna has wider beam width, and the cross polarization level of the antenna is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an inverted ridge corrugated horn feed source based on balanced feed according to the present invention;
FIG. 2 is a schematic diagram of a cross-shaped inverted ridge feed structure;
FIG. 3 is a schematic diagram of a cross-shaped inverted ridge structure;
FIG. 4 is a graph of a ridge curve of a cross inverted ridge transition section;
the reference numerals in the figures mean: 1 is balanced feed structure, 2 is the short circuit board, 3 is the cross back ridge, 4 is the back ridge ripple loudspeaker feed antenna of balanced feed, 5 is axial corrugated groove, 6 is conical horn wall, 7 is the round platform, 8 is cross back ridge curve feed section, 9 is cross back ridge curve changeover portion, 10 is coaxial probe, 11, 12, 13 are three groove one, two, three of axial corrugated groove 5 respectively, 14 is the rectangular pyramid of cross back ridge.
Detailed Description
The specific concept of the invention is as follows: the balanced feed technology is commonly used in circular waveguide horn antennas in the early days, but is not commonly used in ridged horn antennas, and a differential signal is fed into an upper ridge sheet and a lower ridge sheet by using a four-axis feed mode at the bottom of a horn, so as to realize balanced feed. However, this approach of introducing four feeding axes from the bottom makes it difficult to match the feedhorn well with the feeder. By utilizing the inverted ridge, the probes are inserted into the ridge piece from one side and the symmetrical side of the horn wall to realize feeding, so that the purity of the excited fundamental mode can be well ensured, the high-order mode is inhibited, and the return loss of the antenna is reduced. In order to match with a cross-shaped inverted ridge of the extension port face, three axial corrugated grooves are loaded at the port face position by utilizing a corrugated groove technology, the axial corrugated grooves can expand the wave beam width of a frequency band, and meanwhile, the electric field distribution of the horn port face can be compressed by the corrugated grooves, so that the cross polarization level of a horn can be reduced, and the test system can be applied to a test system probe, particularly the field of compact range test.
According to the concept of the invention, the invention adopts the following technical scheme:
as shown in FIG. 1, firstly, the size of the opening surface of the antenna of the conical horn wall 6 and the horn length are determined, the diameter of the opening surface of the conical horn wall 6 is between 0.715 lambda and 0.908 lambda, the electrical size of the horn length is between 2.04 lambda and 2.14 lambda, and the distance between the conical horn wall 6 and the cross-shaped inverted ridge 3 influences the matching of the antenna 4.
As shown in fig. 4, a transition section 9 ridge curve of the inverted cross-shaped ridge 3 of the present invention is shown, and the transition section 9 ridge curve of the inverted cross-shaped ridge 3 generally takes the form of a modified exponential function: y is a × ekx+ bxx x-a, where k mainly determines the opening speed of the ridge curve, and the larger k, the larger opening angle, the shorter the corresponding antenna axial length, and the smaller k, the smaller opening angle, and the longer the antenna axial length. Meanwhile, the coefficients a and b can also control the change degree of the ridge curve, the field angle can be better adjusted by taking a primary term as a correction term, the optimization is convenient, the beam width and the return loss are related to the field angle of the cross-shaped inverse ridge, the values of a, b and k obtained by the optimization are respectively 2.65, 0.01 and 0.0405, H is the total height of the ridge curve, and the height of the ridge influences the matching effect of the antenna 4.
As shown in fig. 3, the four ridges are perpendicular to each other and form a cross shape, and a rectangular pyramid 14 is connected to the top.
As shown in fig. 1 and 2, the balanced feed structure 1 is to feed differential signals with equal amplitude and opposite phase from two opposite directions through two coaxial probes 10, the outer conductors of the coaxial probes are connected with the horn wall 6, the inner conductors are connected with the inverted cross-shaped ridge 3, and the distance from the coaxial probes 10 to the bottom short-circuit board 2 is about a quarter of a wavelength corresponding to the lowest frequency. The bottom of the feed source antenna is a short circuit board 2, a circular truncated cone 7 is carried on the short circuit board 2, the inverted ridge can be conveniently supported, the stability of the inverted ridge is enhanced, and meanwhile, the reflection from the short circuit board 2 is also reduced due to the design of the circular truncated cone 7.
Through the optimization of the structure, the antenna can reach the level that the voltage standing wave ratio is less than 1.4 in the working frequency band.
As shown in figure 1, in order to cooperate with the inverted ridge extending out of the horn mouth surface, the structure of the axial corrugated groove 5 is introduced, the axial corrugated groove structure of the three grooves I, II, III 11, 12 and 13 is loaded at the position of the horn antenna mouth surface, the axial corrugated groove 5 and the mouth surface of the conical horn wall 6 are kept horizontal, the corrugated groove widens the wave beam of the antenna, after the corrugated groove is added, the 3dB wave beam width in the whole frequency band is stabilized between 50 and 70 degrees, meanwhile, due to the existence of the corrugated groove, the electric field distribution of the mouth surface is compressed towards the center, so that the cross polarization level of the horn is reduced, and the cross polarization level is larger than 33dB in the whole frequency band.
The improved four-ridge horn antenna can be made of metal with good conductivity such as aluminum and copper, and hard aluminum is adopted as a processing material as a preferred embodiment due to the fact that hard aluminum is high in strength and low in density.
The invention relates to a reverse ridge corrugated horn feed source antenna based on balanced feed, which can be used for a test system probe, particularly for compact range test, and realizes higher test precision. Meanwhile, the feed source can also be applied to the field of radio astronomy and used as a feed source of a large reflector antenna.
Claims (8)
1. The utility model provides a reverse spine ripple horn feed antenna based on balanced feed which characterized in that: the feed balance device comprises a balance feed structure (1), an axial corrugated groove (5), a conical horn wall (6), a cross-shaped reversed ridge (3), a circular truncated cone (7) and a short circuit board (2);
the balanced feed structure (1) feeds in constant-amplitude and opposite-phase differential signals from two opposite directions through four coaxial probes (10), wherein the two coaxial probes are in a group, and the same group of coaxial probes (10) feed in the same-amplitude and opposite-phase differential signals;
the cross-shaped inverted ridge (3) comprises four ridge sheets and a rectangular pyramid (14), the four ridge sheets are perpendicular to each other to form a cross shape, the top of the four ridge sheets is connected with the rectangular pyramid (14), and each ridge sheet is divided into a feeding section (8) and a transition section (9);
the axial corrugated groove (5) comprises three grooves I (11), II (12) and III (13), and the depths and widths of the three grooves I (11), II (12) and III (13) are different;
the round platform (7) is vertically arranged above the short circuit plate (2), the cross-shaped reversed ridge (3) is vertically arranged above the round platform (7), the round platform (7) and the cross-shaped reversed ridge (3) are positioned inside the conical horn wall (6), an inner conductor of a coaxial probe (10) of the balanced feed structure (1) is rotationally symmetrical with four connection points of a feed section (8) of four mutually perpendicular ridge sheets in the cross-shaped reversed ridge (3), and the axial corrugated groove (5) is loaded on the opening surface of the conical horn wall (6);
the outer conductor of the coaxial probe (10) is connected with the conical horn wall (6), the inner conductor is connected with the cross-shaped inverted ridge (3), the distance between the conical horn wall (6) and the cross-shaped inverted ridge (3) at the center is changed by adjusting the inner diameter of the horn, and the distance between the feed point and the short circuit board (2) is adjusted, so that the purity of a basic mode during excitation is ensured, and the generation of high-order modes is inhibited; the whole antenna is equivalent to a three-port circuit, and impedance matching is realized at a third port through constant-amplitude reverse feeding of two ports and an optimized inverted ridge structure; three axial corrugated grooves are loaded at the position of the opening surface of the horn for matching with the inverted ridge structure of the extending opening surface; the depth of the corrugated groove is one fourth of lambada c, lambada c is the wavelength corresponding to the lowest frequency, the width of the three grooves is designed to be wide in the middle and narrow on two sides, the wave beam width is well controlled, the effect of wide wave beams is achieved, the wave beam range is stabilized between 50 degrees and 70 degrees, meanwhile, due to the existence of the corrugated groove, the electric field distribution of the mouth surface is compressed towards the center, the cross polarization level of the horn is reduced, and the cross polarization water average is more than 33dB in the range of plus and minus 12 degrees opening angles on the whole frequency band.
2. The balanced feed based inverted-ridge corrugated horn feed antenna of claim 1, wherein: the ridge piece of the cross-shaped inverted ridge (3) comprises: the feed section (8) is 10-15 mm in length, the electrical size range of the feed section (8) is 0.1-0.15 lambda, and lambda is the wavelength corresponding to the central frequency of the designed frequency band;
the transition section (9) adopts a combination function of an exponential function and a linear function, and the expression of the combination function is that y is 2e0.01x+0.0405x-2, x being the length of the spine transition piece (9) and y being the shape of the spine transition piece (9) as a function of length x;
the thickness range of the cross ridge piece is 7.75-8.15 mm, the electric size range of the thickness of the cross ridge piece is 0.0775-0.0815 lambda, the total length of the cross inverted ridge (3) is 255-265 mm, and the electric size range of the total length of the cross inverted ridge (3) is 2.55-2.65 lambda.
3. The balanced feed based inverted-ridge corrugated horn feed antenna of claim 1, wherein: the cross-shaped inverted ridge (3) is located at the center of the antenna (4) and is higher than the horn mouth surface of the conical horn wall (6).
4. The balanced feed based inverted-ridge corrugated horn feed antenna of claim 1, wherein: an axial corrugated groove (5) is loaded at the horn mouth surface of the conical horn wall (6), and the axial corrugated groove (5) comprises three grooves I (11), II (12) and III (13);
the widths of the first grooves (11) and the third grooves (13) at the innermost side and the outermost side are 6-15 mm, and the electrical size range of the widths of the first grooves (11) and the third grooves (13) at the innermost side and the outermost side is 0.06 lambda-0.15 lambda;
the width of the middle second groove (12) is 18-23 mm, and the electrical size range of the width of the middle second groove (12) is 0.18 lambda-0.23 lambda;
the depth of the innermost groove I (11) is 37.1-40.45 mm, the depth of the middle groove II (12) is 34.45-35.78 mm, the depth of the outermost groove III (13) is 30.475-32.79 mm, and the electrical size ranges of the depths of the groove I (11), the groove II (12) and the groove III (13) are 0.371 lambda-0.4045 lambda, 0.3445 lambda-0.3578 lambda and 0.30475 lambda-0.3279 lambda respectively;
the wall thickness of the axial corrugated groove (5) is 1-1.325 mm, and the electrical size range of the wall thickness of the axial corrugated groove (5) is 0.01-0.01325 lambda.
5. The balanced feed based inverted-ridge corrugated horn feed antenna of claim 1,
the diameter of the bell mouth surface of the conical bell mouth wall (6) is 71.5-90.8 mm, and the electric size range of the diameter of the bell mouth surface is 0.715-0.908 lambda; the length of the conical horn wall (6) is 204-214 mm, and the electrical size is 2.04 lambda-2.14 lambda.
6. The balanced feed based inverted-ridge corrugated horn feed antenna as claimed in claim 1, wherein PTFE is filled between the inner and outer conductors of the coaxial probe (10) of the balanced feed structure (1) of the antenna (4); the antenna is characterized in that the inner conductor and the outer conductor of the coaxial probe (10) of the balanced feed structure (1), the axial corrugated groove (5), the conical horn wall (6), the cross-shaped inverted ridge (3), the circular truncated cone (7) and the short circuit plate (2) of the antenna (4) are made of metal, and the metal is any one of aluminum, iron, tin, copper, silver, gold or platinum or alloy of any combination of multiple metals.
7. The balanced feed based inverted-ridge corrugated horn feed antenna of claim 1,
the cross-shaped reversed ridge (3) is arranged on a circular table (7) on the short circuit board (2);
the radius of the short circuit board (2) is 35.775 mm;
the top radius of the circular truncated cone (7) is 10.6-15.9 mm, and the electrical size range of the top radius of the circular truncated cone (7) is 0.106 lambda-0.159 lambda;
the bottom radius of the circular truncated cone (7) is 23.85-29.15 mm, and the electric size range of the bottom radius of the circular truncated cone (7) is 0.2385 lambda-0.2915 lambda.
8. The balanced feed based inverted ridge corrugated horn feed antenna of claim 1 wherein the distance between the coaxial probe (10) of the balanced feed structure (1) and the short circuit board (2) is 0.23 λ -0.25 λ.
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| CN115579632A (en) * | 2022-12-08 | 2023-01-06 | 北京航空航天大学 | Balanced-feed dual-polarization compact range feed source antenna |
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