CN111146590A - Improved double-frequency feed source loudspeaker - Google Patents
Improved double-frequency feed source loudspeaker Download PDFInfo
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- CN111146590A CN111146590A CN201911279028.2A CN201911279028A CN111146590A CN 111146590 A CN111146590 A CN 111146590A CN 201911279028 A CN201911279028 A CN 201911279028A CN 111146590 A CN111146590 A CN 111146590A
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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
- 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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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Abstract
The invention discloses an improved dual-frequency feed source horn, which comprises a first frequency band feed source horn, a second frequency band circular waveguide and a metal ring playing a role in impedance matching, wherein the first frequency band is lower than the second frequency band, the second frequency band circular waveguide is coaxially arranged in a cavity of the first frequency band feed source horn, a signal of the first frequency band is transmitted through a first cavity formed between the outer surface of the second frequency band circular waveguide and the side wall of the cavity of the first frequency band feed source horn, and a signal of the second frequency band is transmitted through an inner cavity of the second frequency band circular waveguide; the metal ring is coaxially arranged in a first cavity for transmitting the first frequency band signal. The invention has the advantages that: because the feed source horn has different index requirements, the first cavity in the coaxial feed source technical scheme realizes the effective radiation of electromagnetic waves in a first frequency band, the second frequency band circular waveguide realizes the effective radiation of electromagnetic waves in a second frequency band, and the innovative loading metal ring in the first cavity realizes good impedance matching, thereby meeting the different index requirements of the feed source horn.
Description
The invention relates to a split application, the application date of the original application is 2017, 12 and 05, the application number is 201711270269.1, and the name is a double-frequency feed source horn comprising a metal ring.
Technical Field
The invention belongs to the technical field of radar antennas, and particularly relates to an improved dual-frequency feed source horn.
Background
The dual-band dual-polarization radar is helpful for further understanding the refined physical structure and the evolution characteristics of the weather system from clear air atmosphere → cloud and precipitation → precipitation, and improves the understanding of the physical mechanism of the weather system. The space-time distribution of macro and micro physical parameters of meteorological targets such as cloud and rainfall is obtained by all-weather, all-sky, high space-time resolution and multi-parameter continuous observation of various weather phenomena such as non-rainfall, weak-rainfall cloud, laminar and convective (thunderstorm) rainfall, fog and haze. The method not only promotes the deep development of researches on medium and small-scale weather systems, thunderstorm lightning, relevant modes and the like, but also provides help for monitoring, tracking and short-term forecasting of strong weather such as local rainstorms, hail, tornadoes, downburst storms and the like. With the progress of the millimeter wave technology level, the millimeter wave cloud detection radar technology is also rapidly developed. Practice proves that the radars in all bands have advantages and disadvantages for target detection, so that two or more wavelengths of radars need to be used simultaneously, and the cloud and rain states can be mastered more comprehensively.
In the early stage, dual-wavelength detection is carried out by adopting dual radars, namely two radars with different wave bands are started at the same time to detect the same target. The biggest problem of the method is that the same target is difficult to be detected by two radars, the equipment quantity is large, and the operation and maintenance requirements are high. Therefore, the development of a dual-wavelength radar with a common-aperture high-gain antenna and suitable impedance matching is an effective method for solving the problems.
Disclosure of Invention
To overcome the above-mentioned deficiencies of the prior art, the present invention provides an improved dual-frequency feed horn.
In order to achieve the purpose, the invention adopts the following technical scheme:
an improved dual-frequency feed source horn comprises a first frequency band feed source horn, a second frequency band circular waveguide and a metal ring playing a role in impedance matching, wherein the first frequency band is lower than the second frequency band, the second frequency band circular waveguide is coaxially arranged in a cavity of the first frequency band feed source horn, a signal of the first frequency band is transmitted through a first cavity formed between the outer surface of the second frequency band circular waveguide and the side wall of the cavity of the first frequency band feed source horn, and a signal of the second frequency band is transmitted through an inner cavity of the second frequency band circular waveguide; the metal ring is coaxially arranged in a first cavity for transmitting a first frequency band signal.
Preferably, the becket comprises a first becket and a second becket which are arranged at intervals, the inner diameter of the first becket is fixedly connected with the outer surface of the second frequency band circular waveguide, and the outer diameter of the second becket is fixedly connected with the side wall of the inner cavity of the first frequency band feed source horn.
Preferably, the first frequency band feed source horn further comprises an excitation structure, the first frequency band feed source horn is provided with a signal transmission groove for transmitting signals in the first cavity, and the excitation structure comprises a first rectangular branch section, a second rectangular branch section, a first rectangular waveguide structure, a second rectangular waveguide structure and a first frequency band synthesis network; the first frequency band synthesis network is an H-plane waveguide T-shaped slot coupler and comprises a horizontal part and a vertical part which are vertically connected;
one end face of the first rectangular branch section and one end face of the second rectangular branch section are respectively inserted into two opposite signal transmission grooves arranged at the same height;
the other side face of the first rectangular branch section, the first rectangular waveguide structure, the horizontal part, the second rectangular waveguide structure and the other end face of the second rectangular branch section are sequentially connected to form a rectangular ring columnar structure, and the end face C, far away from the horizontal part, of the vertical part and parallel to the length direction of the horizontal part is an output port of the first frequency band synthesis network.
Preferably, the first frequency band feed source loudspeaker comprise an excitation structure, a plane formed by the central axis of the rectangular ring columnar structure and the central axis of the first frequency band feed source loudspeaker is used as a symmetrical plane, and the excitation structure is respectively perpendicular to every two symmetrical planes formed by the first frequency band feed source loudspeaker.
Preferably, the first rectangular branch section and the second rectangular branch section are the same in shape and are symmetrical about the symmetry plane, and the first rectangular waveguide structure and the second rectangular waveguide structure are the same in shape and are also symmetrical about the symmetry plane.
Preferably, the excitation structure includes a first excitation structure and a second excitation structure, and a distance between an output port C1 of the first frequency band synthesis network of the first excitation structure and an output port C2 of the first frequency band synthesis network of the second excitation structure in a central axis direction of the dual-frequency feed horn is an integral multiple of a half wavelength of the first frequency band.
Optimized, dual-frequency feed horn still includes the second frequency channel orthomode, first frequency channel feed horn includes first frequency channel reducing section, the first frequency channel waveguide changeover portion as the flare angle section, erects ripple loudspeaker, first frequency channel reducing section, the first frequency channel waveguide changeover portion as the first frequency channel of radiation section and sets gradually, still be provided with the excitation structure on the first frequency channel waveguide changeover portion, the second frequency channel orthomode just stretches out first frequency channel feed horn with the circular waveguide other end coaxial coupling of second frequency channel.
Preferably, the second frequency band orthomode adopts a waveguide structure, and comprises two waveguide output interfaces which are perpendicular to each other and perpendicular to the central axis of the second circular waveguide, the waveguide output interfaces are rectangular, and the central distance between the two waveguide output interfaces is an integral multiple of the waveguide wavelength of the half second frequency band.
Preferably, the first frequency band feed source horn comprises a first frequency band vertical corrugated horn, and one end, located in the first frequency band vertical corrugated horn, of the second frequency band circular waveguide is coaxially provided with a second frequency band dielectric rod.
Preferably, the antenna housing for protecting the dielectric rod is sleeved on the first frequency band vertical corrugated horn.
The invention has the advantages that:
(1) because the feed source horn has different index requirements, the first cavity in the coaxial feed source technical scheme realizes the effective radiation of electromagnetic waves in a first frequency band, the second frequency band circular waveguide realizes the effective radiation of electromagnetic waves in a second frequency band, and the innovative loading metal ring in the first cavity realizes good impedance matching, thereby meeting the different index requirements of the feed source horn.
(2) The first cavity in the coaxial feed source technical scheme realizes effective radiation of electromagnetic waves of a first frequency band, the second frequency band circular waveguide which is coaxially arranged realizes the radiation of the electromagnetic waves of a second frequency band through the loading medium rod, signals of the first frequency band and the second frequency band are radiated through different paths, mutual interference of double frequency bands is effectively avoided, and therefore a filter is not needed, the processing cost is saved, cross polarization in each frequency band and isolation between the double frequency bands are improved, and almost consistent phase centers of the double frequency bands are realized.
(3) The edge irradiation level of the second frequency band feed source can be further narrowed by adjusting the structural parameters of the second frequency band dielectric rod, the first frequency band is hardly affected, and a simple, convenient and effective technical means is provided for the wave beam equalization of the dual-frequency band coplanar antenna.
(4) The arrangement of the rectangular branch nodes in the excitation structure can realize better standing wave and in-band transmission characteristics. Meanwhile, in order to realize dual polarization and better polarization isolation, the distance between the output port C1 of the first frequency band synthesis network of the first excitation structure and the output port C2 of the first frequency band synthesis network of the second excitation structure in the central axis direction of the dual-frequency feed source horn is integral multiple of the wavelength of a half first frequency band.
(5) The invention adopts the first frequency band vertical corrugated horn to realize the E-plane and H-plane beam equalization of the first frequency band, and has very good cross polarization characteristic; meanwhile, the radiation performance of the feed source of the second frequency band of the high frequency band is not deteriorated.
(6) The invention has the characteristics of relatively simple and compact structure, convenient application, excellent performance and the like, and has strong practicability.
Drawings
Fig. 1 is a schematic structural view of a radome for mounting a dual-frequency feed source horn according to the present invention;
fig. 2 is a schematic structural diagram of the dual-frequency feed horn of the present invention without the radome.
FIG. 3 is a cross-sectional view of the whole structure of the dual-frequency feed horn of the present invention including two first metal rings;
fig. 4 is a cross-sectional view of the whole structure of the dual-frequency feed horn of the present invention, which comprises a first metal ring and a second metal ring;
FIG. 5 is a cross-sectional view of a dielectric ring of the present invention;
FIG. 6 is a schematic diagram of an excitation structure on a first band waveguide transition section according to the present invention;
FIG. 7 is a schematic structural diagram of a dielectric rod of a second frequency band according to the present invention;
FIG. 8 is a main polarized radiation pattern for a first frequency band of the present invention;
fig. 9 is a second band main polarization radiation pattern of the present invention.
The notations in the figures have the following meanings:
1-first frequency band dielectric ring 12-dielectric ring cavity 13-corrugated structure
2-first frequency band vertical corrugated horn 3-first frequency band variable diameter section
4-metal ring 41-first metal ring 42-second metal ring
5-first frequency band waveguide transition section 6-excitation structure
61-first excitation structure 62-second excitation structure
611-first rectangular support section 6111-support section rectangular groove
612-second rectangular leg 613-first rectangular waveguide structure 614-second rectangular waveguide structure
615-first frequency band synthesis network 6151-horizontal part 6152-vertical part 6153-opening
7-second frequency band circular waveguide
8-second frequency band dielectric rod 81-matching section 82-supporting section 83-radiating section
9-second frequency band orthogonal mode 10-antenna housing 11-first cavity
Detailed Description
Example 1
As shown in fig. 1-4, an improved dual-band feed horn comprises a first-band feed horn, a metal ring 4 for impedance matching, a second-band dielectric rod 8, a second-band circular waveguide 7, and a second-band orthogonal mode 9. The first frequency band feed source horn comprises a first frequency band vertical corrugated horn 2 serving as a radiation section 83, a first frequency band reducing section 3 serving as a flare angle section and a first frequency band waveguide transition section 5 which are sequentially arranged, and an excitation structure 6 is further arranged on the first frequency band waveguide transition section 5.
The second frequency band circular waveguide 7 is coaxially arranged in the first frequency band feed source horn, signals of the first frequency band are transmitted through a first cavity 11 formed between the outer surface of the second frequency band circular waveguide 7 and the cavity side wall of the first frequency band feed source horn, and signals of the second frequency band are transmitted through an inner cavity of the second frequency band circular waveguide 7. One end of the second frequency band circular waveguide 7, which is positioned in the first frequency band vertical corrugated horn 2, is coaxially provided with a second frequency band dielectric rod 8, and the other end of the second frequency band orthomode 9 and the other end of the second frequency band circular waveguide 7 are coaxially connected and positioned outside the first frequency band feed source horn. And a sealing surface vertical to the central axis is formed between the outer side wall of one end of the second frequency band orthogonal mode 9 of the second frequency band circular waveguide 7 and the first frequency band feed source horn. The first frequency band is lower than the second frequency band. The size of the second frequency band circular waveguide 7 is used for transmitting the operating frequency of the circular waveguide main mode
Where a is the radius of the second band circular waveguide 7. The included angle range of the first frequency band reducing section 3 and the central axis of the dual-frequency feed source horn is 0-20 degrees, and the included angle is 20 degrees in the embodiment. Wherein, the antenna housing 10 for protecting the dielectric rod is sleeved on the first frequency band vertical corrugated horn 2.
The first cavity 11 in the coaxial feed source technical scheme realizes the effective radiation of electromagnetic waves of a first frequency band, the second frequency band circular waveguide 7 which is coaxially arranged realizes the radiation of electromagnetic waves of a second frequency band through a loading medium rod, signals of the first frequency band and the second frequency band are radiated through different paths, the mutual interference of double frequency bands is effectively avoided, thus not only a filter is not needed, thereby saving the processing cost, but also the cross polarization in each frequency band and the isolation between the double frequency bands are improved, and the almost consistent phase center of the double frequency bands is realized. The edge irradiation level of the second frequency band feed source can be further narrowed by adjusting the structural parameters of the second frequency band dielectric rod 8, the first frequency band is hardly influenced, and a simple, convenient and effective technical means is provided for the wave beam equalization of the dual-frequency band coplanar antenna.
As shown in fig. 7, the second frequency band dielectric rod 8 includes a matching section 81, a supporting section 82, and a radiation section 83 located in the second frequency band circular waveguide 7, the matching section 81 is a conical structure, the supporting section 82 includes a cylindrical structure and a cylindrical structure outside of the inner cavity of the second frequency band circular waveguide 7, a limiting structure for fixing the second frequency band dielectric rod 8 on the first frequency band circular waveguide is provided, and the radiation section 83 adopts an index gradual change structure.
The second band circular waveguide 7 has an inner radius of 3.2mm and a wall thickness of 0.8mm in this embodiment. The second frequency band is the Ka frequency band, for realizing rotational symmetry's radiation pattern, and have less loudspeaker bore, second frequency band dielectric rod 8 divides into three part at the Ka frequency band, matching section 81 in second frequency band circular waveguide 7 is the circular cone structure, can obtain good matching characteristic, second frequency band circular waveguide 7 sets up the arch as limit structure at support section 82, limit structure is the loop configuration of cover cylinder structure in this embodiment, the outer radius of loop configuration equals the outer diameter of first frequency band circular waveguide, be favorable to the fixed and installation mark of dielectric rod like this, radiation section 83 then adopts the form of index gradual change, obtain good high frequency radiation characteristic, through adjusting the structural parameter of dielectric rod, can adjust the marginal irradiation level of high frequency band feed source, and hardly have the influence to the low frequency.
The metal rings 4 are coaxially arranged in the first cavity 11 for transmitting the first frequency band signal, and at least one metal ring 4 is arranged. The metal rings 4 have three setting modes, and the first mode is that the inner side walls of a plurality of metal rings 4 are coaxially and fixedly connected with the outer side wall of the second frequency band circular waveguide 7 and are used as impedance matching of the first frequency band feed source horn. The second is that the outer side walls of a plurality of metal rings 4 are coaxially and fixedly connected with the inner cavity side wall of the first frequency band feed source loudspeaker to serve as impedance matching of the first frequency band feed source loudspeaker. The third is that the metal ring 4 includes the first metal ring 41 and the second metal ring 42 that the interval set up, the internal diameter of first metal ring 41 and the surface fixed connection of second frequency channel circular waveguide 7, the external diameter of second metal ring 42 and the lateral wall fixed connection of the inner chamber of first frequency channel feed horn, first metal ring 41 and second metal ring 42 interval set up, as the impedance matching of first frequency channel. In fig. 3, two first metal rings 41 are provided as impedance matching of the first frequency band, and in fig. 4, two first metal rings 41 and a first metal ring 41 disposed between the two first metal rings 41 are included, so that transmission of the TE11 mode in the first cavity 11 is adjusted, and the port standing wave characteristic is ensured.
The second frequency band orthomode 9 adopts a waveguide structure and comprises two waveguide output interfaces which are perpendicular to each other and perpendicular to the central axis of the second frequency band circular waveguide 7, the waveguide output interfaces are rectangular, and the distance between the centers of the two waveguide output interfaces is integral multiple of the waveguide wavelength of a half second frequency band.
As shown in fig. 3 and fig. 5, a first frequency band dielectric ring 1 coaxial with the second frequency band circular waveguide 7 is arranged in the first frequency band vertical corrugated horn 2, the first frequency band dielectric ring 1 includes a dielectric ring cavity 12 through which the second frequency band dielectric rod 8 can pass, and the first frequency band dielectric ring 1 further has a corrugated structure 13 for filling the vertical corrugated horn.
The medium ring cavity 12 is in a conical shape with a central axis coinciding with the central axis of the second frequency band circular waveguide 7, one end of the medium ring cavity 12 with a small diameter is in contact with the second frequency band circular waveguide 7, the outer surface of the first frequency band medium ring 1 is in a conical shape, and the diameter of one end of the outer surface, which is far away from the second frequency band circular waveguide 7, is smaller than that of one end of the outer surface, which is in contact with the second frequency band circular waveguide 7. The mode of loading the first frequency band medium ring 1 in the first frequency band vertical corrugated loudspeaker 2 effectively reduces the irradiation level of the same irradiation angle under the condition of keeping the caliber of the loudspeaker unchanged, and has good characteristics of E-plane and H-plane beam equalization and cross polarization. The feed source is applied as a feed source of the Cassegrain antenna, so that small feed source shielding and low side lobe characteristics of the antenna are easy to realize.
In the size design of the coaxial waveguide, it is ensured that only the TEM mode and the first higher order TE mode can be transmitted in the first cavity 1111Die, the size of the first cavity 11 to transport TE therethrough11The cutoff frequency of the mode is determined by calculation according to the formula
Wherein a is the outer diameter of the second frequency band circular waveguide 7, i.e. the inner diameter of the first cavity 11, and b is the outer diameter of the first cavity 11, i.e. the inner diameter of the first frequency band feed horn.
In order to realize good radiation directional diagrams of an X frequency band and a Ka frequency band, and double-frequency-band dual-polarization performance with low cross polarization and high isolation between ports, a radiation directional diagram with rotationally symmetric E surface and H surface of the X frequency band is realized by utilizing a first frequency band variable diameter section 3 and a first frequency band vertical corrugated horn 2, and under the condition of keeping the caliber unchanged, the radiation level at the equal angle is reduced by about-10 dB by arranging a first frequency band medium ring 1. Meanwhile, in order to avoid influencing the radiation performance of the feed source in the high-frequency Ka frequency band, the first frequency band medium ring 1 is fixedly connected with the outer side wall of the second frequency band circular waveguide 7, so that the second frequency band circular waveguide 7 is fixedly supported.
As shown in FIG. 6, to excite the TE in the first cavity 1111In the mode, an excitation structure 6 is arranged at the position of the first frequency band transition section 5 of the first frequency band feed source horn, the excitation structure 6 includes a first excitation structure 61 and a second excitation structure 62 which are of two same structures, and the first excitation structure 61 includes a first rectangular branch 611, a second rectangular branch 612, a first rectangular waveguide structure 613 and a second rectangular waveguide structure 614. The first frequency band synthesis network 615 is an H-plane waveguide T-shaped slot coupler, a first rectangular branch 611, a first rectangular waveguide structure 613, a horizontal portion 6151 of the H-plane waveguide T-shaped slot coupler, a second rectangular waveguide structure 614, a second rectangular branch 612, and a first frequency band waveguide transition section 5 at the connection of the first rectangular branch 611 and the second rectangular branch 612 are sequentially connected to form a closed rectangular ring-column structure, a vertical portion 6152 of the H-plane waveguide T-shaped slot coupler is located in the middle of the horizontal portion 6151 and is parallel to the central axis of the rectangular ring-column structure,the outer side surfaces of the four corners of the rectangular ring structure are chamfered surfaces, wherein the first rectangular branch 611, the first rectangular waveguide structure 613, the H-surface waveguide T-shaped slot coupler, the second rectangular waveguide structure 614 and the second rectangular branch 612 are integrated. The upper end face of the horizontal portion 6151 of the H-plane waveguide T-slot coupler, which is opposite to the vertical portion 6152, is provided with a notch 6153 parallel to the vertical portion 6152, and a notch 6153 is also arranged at the connection of the horizontal portion 6151 and the vertical portion 6152. A central axis of a vertical portion 6152 of the H-plane waveguide T-slot coupler in the length direction and a central axis of the first frequency band feed horn form a symmetry plane in parallel, the first rectangular stub 611 and the second rectangular stub 612 with the same shape are symmetric with respect to the symmetry plane, and the first rectangular waveguide structure 613 and the second rectangular waveguide structure 614 with the same shape are also symmetrically arranged with respect to the symmetry plane. An end face C1 of the H-plane waveguide T-slot coupler, where the vertical portion 6152 is far away from the horizontal portion 6151 and is parallel to the length direction of the horizontal portion 6151, is an output port of the first frequency band combining network 615, and the end face C1 is rectangular.
The structure on one side of the symmetry plane is described below, where the first rectangular stub 611 is a cylindrical cavity structure, the outer surface of the cylindrical cavity structure is provided with a plurality of stub rectangular grooves 6111 in parallel in the length direction, and the central axis of the stub rectangular groove 6111 coincides with the central axis of the cylindrical cavity structure. The depth of the branch section rectangular groove 6111 and the distance between adjacent annular grooves in the length direction of the rectangular cylinder are set according to the required impedance matching, a signal transmission groove (not shown in the figure) communicated with the first cavity 11 is arranged on the first frequency band waveguide transition section 5, and one end face, perpendicular to the length direction, of the first rectangular branch section 611 extends into the first cavity 11 through the signal transmission groove and is parallel to the outer side wall of the first cavity 11. The signal transmission slot is matched with the outer surface dimension of the first rectangular stub 611 in the length direction, so that the whole first excitation structure 61 is fixed by the signal transmission slot.
The first rectangular waveguide structure 613 is a cylindrical structure with a horizontal cross-section in the shape of a middle bracket, and one end surface of the first rectangular waveguide structure 613 is connected to the other end surface of the first rectangular stub 611 perpendicular to the length direction. The other end face of the first rectangular waveguide structure 613 is connected to the end face of the horizontal portion 6151 of the first band combining network 615 perpendicular to the length direction.
The symmetry planes of the first excitation structure 61 and the second excitation structure 62 are perpendicular to each other. The distance from the central axis of the closed rectangular ring columnar structure to the inner side surface of the signal transmission groove is one quarter of the waveguide wavelength of the central frequency of the X wave band. The arrangement of the first rectangular stub 611 and the second rectangular stub 612 can achieve better standing wave and in-band transmission characteristics. Meanwhile, in order to realize dual polarization and better polarization isolation, the distance from the end face C1 of the vertical portion 6152 of the first excitation structure 61 to the end face C2 of the vertical portion 6152 of the second excitation structure 62 is about integral multiple of half of the wavelength of the first frequency band.
The first frequency band medium ring 1, the first frequency band vertical corrugated horn 2, the first frequency band diameter-changing section 3, the first frequency band matched metal ring 4, the first frequency band waveguide transition section 5 and the excitation structure 6 realize output of a first frequency band dual-polarized signal, and the second frequency band circular waveguide 7, the second frequency band medium rod 8 and the second frequency band orthogonal mode 9 realize output of a second frequency band dual-polarized signal.
The invention has simple and compact structure and good dual-band performance index, as shown in fig. 8 and 9. The simulation result of the invention shows that the feed source of the Cassegrain antenna has good edge irradiation level and a rotationally symmetric radiation directional diagram, the coincidence degree of the phase centers of the two frequency bands is high, and the integral radiation efficiency of the antenna is greatly improved.
Example 2
Different from the embodiment 1, the included angle range of the first frequency band diameter-changing section 3 and the central axis of the dual-frequency feed source horn is 0 degrees.
Example 3
Different from the embodiment 1, the included angle range of the first frequency band diameter-changing section 3 and the central axis of the dual-frequency feed source horn is 10 degrees.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An improved double-frequency feed horn is characterized by comprising a first frequency band feed horn, a second frequency band circular waveguide (7) and a metal ring (4) playing a role in impedance matching, wherein the first frequency band is lower than the second frequency band, the second frequency band circular waveguide (7) is coaxially arranged in a cavity of the first frequency band feed horn, a signal of the first frequency band is transmitted through a first cavity (11) formed between the outer surface of the second frequency band circular waveguide (7) and the side wall of the cavity of the first frequency band feed horn, and a signal of the second frequency band is transmitted through an inner cavity of the second frequency band circular waveguide (7); the metal ring (4) is coaxially arranged in a first cavity (11) for transmitting a first frequency band signal;
the dual-frequency feed horn further comprises a second frequency band orthogonal mode (9), the first frequency band feed horn comprises a first frequency band reducing section (3) and a first frequency band waveguide transition section (5) which are used as flare angle sections, the first frequency band vertical corrugated horn (2), the first frequency band reducing section (3) and the first frequency band waveguide transition section (5) which are used as radiation sections are sequentially arranged, an excitation structure (6) is further arranged on the first frequency band waveguide transition section (5), and the second frequency band orthogonal mode (9) is coaxially connected with the other end of a second frequency band circular waveguide (7) and stretches out the first frequency band feed horn.
2. The improved dual-frequency feed horn of claim 1, wherein the metal ring (4) comprises a first metal ring (41) and a second metal ring (42) which are arranged at intervals, the inner diameter of the first metal ring (41) is fixedly connected with the outer surface of the second frequency band circular waveguide (7), and the outer diameter of the second metal ring (42) is fixedly connected with the side wall of the inner cavity of the first frequency band feed horn.
3. The improved dual-frequency feed horn of claim 1, wherein the first frequency band feed horn further comprises an excitation structure (6), the first frequency band feed horn is provided with a signal transmission groove for transmitting signals in the first cavity (11), and the excitation structure (6) comprises a first rectangular branch (611), a second rectangular branch (612), a first rectangular waveguide structure (613), a second rectangular waveguide structure (614) and a first frequency band synthesis network (615); the first frequency band synthesis network (615) is an H-plane waveguide T-shaped slot coupler and comprises a horizontal part (6151) and a vertical part (6152) which are vertically connected;
one end surface of the first rectangular branch joint (611) and one end surface of the second rectangular branch joint (612) are respectively inserted into two opposite signal transmission grooves arranged at the same height;
the other side face of the first rectangular branch section (611), the first rectangular waveguide structure (613), the horizontal part (6151), the second rectangular waveguide structure (614) and the other end face of the second rectangular branch section (612) are sequentially connected to form a rectangular ring columnar structure, the end face C, which is far away from the horizontal part (6151) and is parallel to the length direction of the horizontal part (6151), of the vertical part (6152) is an output port of the first frequency band synthesis network (615), and the two signal transmission grooves are respectively arranged on the circular cross section of the first frequency band waveguide transition section (5) at a position 180 degrees apart.
4. The improved dual-frequency feed source horn as claimed in claim 3, wherein a plane formed by the central axis of the rectangular ring columnar structure and the central axis of the first frequency band feed source horn is taken as a symmetry plane, and the excitation structures (6) are respectively perpendicular to the symmetry plane formed by the first frequency band feed source horn in pairs.
5. The improved dual-frequency feed horn of claim 4 wherein the first rectangular stub (611) and the second rectangular stub (612) are the same shape and are symmetrical about a plane of symmetry, and wherein the first rectangular waveguide structure (613) and the second rectangular waveguide structure (614) are the same shape and are also symmetrical about a plane of symmetry.
6. An improved dual-frequency feed horn as claimed in claim 3 or 4, wherein said excitation structure (6) comprises a first excitation structure (61) and a second excitation structure (62), and the distance between the output port C1 of the first band combining network (615) of the first excitation structure (61) and the output port C2 of the first band combining network (615) of the second excitation structure (62) in the direction of the central axis of the dual-frequency feed horn is an integral multiple of half of the wavelength of the first band.
7. The improved dual-frequency feed horn of claim 1, wherein the second frequency band orthomode (9) adopts a waveguide structure, and comprises two waveguide output interfaces which are perpendicular to each other and perpendicular to the central axis of the second circular waveguide, the waveguide output interfaces are rectangular, and the central distance between the two waveguide output interfaces is an integral multiple of the waveguide wavelength of half second frequency band.
8. The improved double-frequency feed horn of claim 3, wherein the first frequency band feed horn comprises a first frequency band vertical corrugated horn (2), and one end of the second frequency band circular waveguide (7) positioned in the first frequency band vertical corrugated horn (2) is coaxially provided with a second frequency band dielectric rod (8).
9. The improved dual-frequency feed horn of claim 8, wherein the first frequency band vertical corrugated horn (2) is sleeved with an antenna cover (10) which can protect a dielectric rod.
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| CN112421226A (en) * | 2020-11-11 | 2021-02-26 | 中国电子科技集团公司第二十九研究所 | Dual-frequency dual-polarization high-power antenna |
| CN114204267A (en) * | 2021-11-30 | 2022-03-18 | 中国电子科技集团公司第五十四研究所 | Miniaturized multi-frequency shared circularly polarized coaxial feed source network |
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| CN109473775A (en) * | 2019-01-07 | 2019-03-15 | 北京西宝电子技术有限责任公司 | Ku/E waveband double-frequency one feed |
| CN110380161A (en) * | 2019-07-23 | 2019-10-25 | 广东盛路通信科技股份有限公司 | A kind of OMT of the microwave frequency band of coaxial waveguide structure |
| CN112615162B (en) * | 2020-12-14 | 2021-10-22 | 西安电子科技大学 | Common-caliber three-frequency multi-mode horn antenna |
| CN114205729B (en) * | 2021-12-17 | 2023-10-27 | 南京驰韵科技发展有限公司 | Processing technology of terahertz frequency band feed source loudspeaker |
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| CN111146590B (en) | 2021-06-15 |
| CN108134182B (en) | 2020-03-17 |
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