CN109449554B - Novel butterfly oscillator orthomode polarization coupler - Google Patents
Novel butterfly oscillator orthomode polarization coupler Download PDFInfo
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- CN109449554B CN109449554B CN201811381933.4A CN201811381933A CN109449554B CN 109449554 B CN109449554 B CN 109449554B CN 201811381933 A CN201811381933 A CN 201811381933A CN 109449554 B CN109449554 B CN 109449554B
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- 230000005284 excitation Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 19
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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Abstract
The invention discloses a novel butterfly oscillator orthomode polarization coupler, which comprises: the butterfly oscillator feed structure comprises a waveguide, a bottom plate fixedly arranged at the bottom of the waveguide and a pair of butterfly dipoles which are arranged on the upper end face of the bottom plate in a crisscross mode. The invention designs a novel butterfly oscillator broadband orthomode polarization coupler which has a compact structure and a length of only one fourth of the low-frequency wavelength. Compared with a common vibrator type orthomode polarization coupler commonly used in radio astronomy, the novel butterfly vibrator orthomode polarization coupler has the working bandwidth widened from 1.7:1 to 2:1. According to the invention, the butterfly oscillator is introduced into the waveguide for feeding for the first time, so that excitation of TM01, TE21 and TE01 modes in the circular waveguide is effectively inhibited, and the single-mode bandwidth is increased from 1.3:1 to 2.08:1.
Description
Technical Field
The invention relates to the field of orthomode polarization couplers, in particular to a novel orthomode polarization coupler for a butterfly oscillator.
Background
At present, although the four-ridge waveguide orthogonal mode polarization coupler has good comprehensive performance in the bandwidth range of 2.2:1, the length of the orthogonal mode polarization coupler generally needs 2.4-4 low-frequency wavelengths, and is not suitable for application occasions below 1 GHz. Aiming at the miniaturization requirement of a low-frequency refrigeration receiver, the application designs a novel butterfly oscillator broadband orthomode polarization coupler which is compact in structure and has the length of only one fourth of the low-frequency wavelength. Compared with a common vibrator type orthomode polarization coupler commonly used in radio astronomy, the novel butterfly vibrator orthomode polarization coupler has the working bandwidth widened from 1.7:1 to 2:1.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a novel butterfly oscillator orthomode polarization coupler to solve the technical problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a novel butterfly vibrator orthomode polarization coupler, comprising: the butterfly oscillator feed structure comprises a waveguide, a bottom plate fixedly arranged at the bottom of the waveguide and a pair of butterfly dipoles which are arranged on the upper end surface of the bottom plate in a crisscross manner;
the butterfly oscillator feed structure comprises 4 metal array arms, 2 hollow cylindrical coaxial outer conductors, 2 grounding cylinders, 2 coaxial inner probes and 2 feed connecting sheets; wherein, the upper and lower ends of the hollow cylindrical coaxial outer conductor and the grounding cylinder are fixedly provided with a triangular base; the hollow cylindrical coaxial outer conductor and the grounding cylinder are fixedly arranged on the bottom plate through the triangular base at the lower end of the hollow cylindrical coaxial outer conductor and the grounding cylinder respectively; 2 hollow cylindrical coaxial outer conductors and 2 grounding cylinders form a square structure with two rows and two columns on the bottom plate, and 2 hollow cylindrical coaxial outer conductors are adjacently arranged; the hollow cylindrical coaxial outer conductor and the grounding cylinder are fixedly connected with 1 metal array arm through the triangular base at the upper end of the hollow cylindrical coaxial outer conductor and the grounding cylinder respectively;
one end of each of the 2 coaxial inner probes is connected with the SMA inner core, and then penetrates into the 2 hollow cylindrical coaxial outer conductors from the through holes on the bottom plate respectively, and the coaxial inner probes and the hollow cylindrical coaxial outer conductors are placed in an insulating manner; the other end of the coaxial inner probe is connected with one end of the feed connecting sheet, and the other end of the feed connecting sheet is fixedly and electrically connected with the metal oscillator arm connected with the grounding cylinder; a feed connection piece connects a coaxial inner probe in a hollow cylindrical coaxial outer conductor arranged diagonally with a metal vibrator arm on a grounding cylinder.
As a further technical scheme, the top of the hollow cylindrical coaxial outer conductor is provided with an insulating sleeve, the outer diameter of the upper part of the insulating sleeve is larger than the outer diameter of the lower part of the insulating sleeve, and the outer diameter of the lower part of the insulating sleeve is matched with the inner diameter of the hollow cylindrical coaxial outer conductor.
As a further technical scheme, the waveguide is a circular waveguide, and correspondingly, the circular bottom plate of the bottom plate; the circular waveguide is connected with the circular bottom plate through screws.
As a further technical scheme, the radius of the circular waveguide is 0.317 lambda 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein lambda is 0 Corresponding to the low frequency wavelength of the required bandwidth.
As a further technical scheme, an external thread is arranged at one end of the coaxial internal probe, which is connected with the feed connection sheet, correspondingly, a groove with an internal thread is arranged at the corresponding position of the feed connection sheet, and the coaxial internal probe is in threaded connection with the feed connection sheet through the external thread and the groove with the internal thread.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention designs a novel butterfly oscillator broadband orthomode polarization coupler which has a compact structure and a length of only one fourth of the low-frequency wavelength. Compared with a common vibrator type orthomode polarization coupler commonly used in radio astronomy, the novel butterfly vibrator orthomode polarization coupler has the working bandwidth widened from 1.7:1 to 2:1. According to the invention, the butterfly oscillator is introduced into the waveguide for feeding for the first time, so that excitation of TM01, TE21 and TE01 modes in the circular waveguide is effectively inhibited, and the single-mode bandwidth is increased from 1.3:1 to 2.08:1.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a connection structure between a waveguide and a substrate according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a structure of a novel butterfly oscillator orthomode polarization coupler provided by an embodiment of the invention with a waveguide removed;
fig. 3 is a schematic structural diagram of a connection state between a coaxial inner probe and a feed connection piece according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an insulating sleeve according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a connection structure between a metal array arm and a grounding cylinder according to an embodiment of the present invention;
FIG. 6 is an electric field distribution diagram of the first six modes TE11 mode, TM01 mode, TE21 mode, TM11 mode, TE01 mode and TE31 mode of the circular waveguide according to the present embodiment;
FIG. 7 is a graph showing transfer functions of the first six modes TE11 mode, TM01 mode, TE21 mode, TM11 mode, TE01 mode and TE31 mode of a circular waveguide with a radius of 170mm according to the present embodiment;
fig. 8 is a frequency response graph of transmission coupling coefficients from a main mode TEM mode of a coaxial feed input port of a butterfly oscillator quadrature mode polarization coupler to a first five modes TE11 mode, TM01 mode, TE21 mode, TM11 mode, TE01 mode of a circular waveguide port provided in this embodiment;
fig. 9 is a graph of reflection factors and polarization coupling curves of the butterfly oscillator orthomode polarization coupler provided in this embodiment corresponding to two coaxial ports of horizontal and vertical polarization;
FIG. 10 is a graph showing the transmission coupling coefficients of two perpendicular TE11 main modes from the horizontal and vertical polarization coaxial ports to the circular waveguide port of the 560MHz-1120MHz orthogonal mode polarization coupler provided by the present embodiment;
fig. 11 is a graph of actually measured S parameters of two perpendicular polarized ports when the waveguide ports of the butterfly oscillator orthomode polarization coupler provided in the present embodiment are open in free space;
fig. 12 is a graph of simulation and actual measurement results of S parameters when the waveguide port of the butterfly oscillator orthomode polarization coupler provided in the present embodiment is open in free space;
fig. 13 is a graph of transmission coupling coefficients from a TEM mode of the butterfly oscillator in the orthogonal mode polarization coupler simulation and two actually measured polarization directions at normal temperature to a TE11 mode of the circular waveguide main mode;
icon: 1-a waveguide; 2-a bottom plate; 3-metal array arms; 4-a hollow cylindrical coaxial outer conductor; 5-a grounding cylinder; 6-an in-line probe; 7-a feed connection piece; 8-a triangle base; 9-insulating sleeve.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 1-5, this embodiment provides a novel orthomode polarization coupler for a butterfly oscillator, including: the device comprises a waveguide 1, a bottom plate 2 fixedly arranged at the bottom of the waveguide, and a butterfly oscillator feed structure formed by a pair of crisscross butterfly dipoles arranged on the upper end surface of the bottom plate 2;
the butterfly oscillator feed structure comprises 4 metal array arms 3, 2 hollow cylindrical coaxial outer conductors 4, 2 grounding cylinders 5, 2 coaxial inner probes 6 and 2 feed connecting sheets 7; wherein, the upper and lower ends of the hollow cylindrical coaxial outer conductor 4 and the grounding cylinder 5 are fixedly provided with a triangle base 8; the hollow cylindrical coaxial outer conductor 4 and the grounding cylinder 5 are fixedly arranged on the bottom plate 2 through the triangular base 8 at the lower end of the hollow cylindrical coaxial outer conductor and the grounding cylinder respectively; 2 hollow cylindrical coaxial outer conductors 4 and 2 grounding cylinders 5 form a square structure with two rows and two columns on the bottom plate, and 2 hollow cylindrical coaxial outer conductors 4 are adjacently arranged; the hollow cylindrical coaxial outer conductor 4 and the grounding cylinder 5 are fixedly connected with 1 metal array arm 3 through the triangular base 8 at the upper end of the hollow cylindrical coaxial outer conductor and the grounding cylinder respectively;
one end of each of the 2 coaxial inner probes 6 is connected with the SMA inner core, and then penetrates into the 2 hollow cylindrical coaxial outer conductors 4 from the through holes on the bottom plate, and the coaxial inner probes 6 and the hollow cylindrical coaxial outer conductors 4 are placed in an insulating manner; the other end of the coaxial inner probe 6 is connected with one end of the feed connection sheet 7, and the other end of the feed connection sheet 7 is fixedly and electrically connected with the metal vibrator arm 3 connected with the grounding cylinder 5; a feed connection 7 connects the coaxial inner probe in the hollow cylindrical coaxial outer conductor arranged diagonally with the metal vibrator arm on the grounding cylinder.
The cross-shaped crossed butterfly dipole adopts an air-filled coaxial feed structure, the outer wall of the coaxial line is grounded, one end of the inner probe is connected with the opposite metal vibrator arm through the feed connecting component, and the other end of the inner probe is connected with an SMA joint below the circular floor, so that the cross-shaped crossed butterfly dipole can be directly connected with a single-ended coaxial feed low-noise amplifier. Two grounding cylinders are opposite to the two polarized coaxial feed structures, and the grounding cylinders and the coaxial feed structures form a folding balun together, so that the conversion from balanced feed to unbalanced feed is realized; meanwhile, the introduction of the grounding cylinder improves the symmetry of the structure and can inhibit radiation generated by the coaxial outer wall; in addition, the coaxial feed structure and the grounding cylinder can both play a role in supporting the butterfly-shaped metal arm.
In this embodiment, as a further technical solution, an insulating sleeve 9 is disposed on top of the hollow cylindrical coaxial outer conductor 4, and an upper outer diameter of the insulating sleeve 9 is larger than a lower outer diameter, and the lower outer diameter is adapted to an inner diameter of the hollow cylindrical coaxial outer conductor.
In this embodiment, as a further technical solution, the waveguide 1 is a circular waveguide, and correspondingly, the bottom plate 2 is a circular bottom plate; the circular waveguide is electrically connected with the circular bottom plate through screws.
In this embodiment, as a further technical solution, an external thread is provided at the end of the coaxial inner probe 6 connected to the feed connection piece 7, and correspondingly, a groove with an internal thread is provided at the corresponding position of the feed connection piece, and the coaxial inner probe is screwed with the feed connection piece through the external thread and the groove with an internal thread.
Referring to fig. 6, (a) - (f) show the electric field distribution of the first six modes of TE11 mode, TM01 mode, TE21 mode, TM11 mode, TE01 mode and TE31 mode of the circular waveguide, respectively. Since the electric field distribution of the butterfly-shaped array is similar to that of an electric dipole, the electric field lines start from one arm of the butterfly-shaped oscillator and end at the opposite metal arm, and according to the electric field distribution diagrams of (b) (c) (e) (f), the feeding mode of the butterfly-shaped oscillator is adopted in the circular waveguide, the modes of the higher modes TM01, TE21, TE01 and TE31 with the cross section center electric fields of zero cannot be excited, so that the single mode bandwidth of the polarizer fed by the butterfly-shaped oscillator is determined by the cut-off frequencies of the main mode TE11 mode and the higher mode TM11 mode, and the corresponding bandwidth is 2.08:1.
In this embodiment, as a further technical solution, the radius of the circular waveguide is 0.317 λ 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein lambda is 0 Corresponding to the low frequency wavelength of the required bandwidth. In the present invention, the radius of the circular waveguide was 170mm. The cut-off frequencies of TE11 and TM11 of the circular waveguide with the radius of 170mm are respectively 0.52GHz and 1.08GHz, so that the single-mode bandwidth of the butterfly-shaped vibrator polarizer is theoretically 0.52GHz-108GHz. Here, the radius of the circular waveguide is selected to be 170mm for two reasons:
1) Although the cutoff frequency of the TE11 mode is 0.52GHz, there is a large reflection level near the cutoff frequency, so that a certain redundancy is necessary at low frequency to ensure that the reflection loss of the main mode in the band of the orthogonal mode polarization coupler of 560MHz-1120MHz is better than 10dB.
2) The cutoff frequency for the TM11 mode is 1.08GHz, very close to the upper edge of the desired operating band, 1.12GHz. Similar to the first bar analysis, the higher order modes have greater reflection around the cut-off frequency and are not easily transmitted.
As shown in connection with FIG. 7, it is a plot of the propagation function of the first six modes of a circular waveguide with a radius of 170mm, where TM11 and TE01 have the same corresponding cut-off frequency, which is a degenerate mode. Five curves from left to right (from low frequency to high frequency) in the figure correspond to modes TE11 (coffee), TM01 (Bao lan), TE21 (Jun Green), TM11/TE01 (blue Green) and TE31 (orange) respectively.
As shown in fig. 8, the frequency response characteristics of transmission coupling coefficients from a main mode TEM mode of a coaxial feed input port to the first five modes of a circular waveguide port of a butterfly oscillator quadrature mode polarization coupler are shown, and the cut-off frequency of the TE31 mode is out of the required frequency range, so that the cut-off frequency is not considered. As can be seen, the transmission coupling coefficients of the TEM mode to the TM01, TE01 and TE21 modes are very low, the low frequency is below-50 dB, and the high frequency is not higher than-30 dB. For the higher order mode TM11 mode, which determines the single mode bandwidth, the transmission coupling coefficient becomes larger with increasing frequency, but does not exceed-20 dB over the required bandwidth. Therefore, the high-order modes cannot be effectively excited in the butterfly oscillator orthogonal mode polarizer, and the rationality of mode analysis and waveguide size selection of the method is verified.
Referring to fig. 9, the reflection factors and polarization coupling degrees of the two coaxial ports corresponding to the horizontal and vertical polarizations of the polarization coupler of the present invention are shown, wherein the blue and red curves respectively correspond to the reflection factors of the horizontal and vertical polarization ports of the polarization coupler of the present invention, and the following coffee curves are the polarization coupling degrees of the two polarization ports. It can be seen that in the range of 0.55GHz-1.15GHz, the reflection factor is less than-10 dB, the port isolation is better than 33dB, and the reflection factors are all below-14 dB in the range of 0.58GHz-1.04 GHz.
Referring to fig. 10, transmission coupling coefficients of two perpendicular TE11 main modes from two coaxial ports of the polarization coupler of the present invention, horizontal and vertical, to a circular waveguide port are shown, wherein a blue curve is the TE11 main mode transmission coupling coefficient of the horizontal polarization port, and a red curve is the TE11 main mode transmission coupling coefficient of the vertical polarization port; it can be seen that the TE11 main mode transmission coupling coefficient is greater than-0.5 dB in the range of 0.56GHz-1.12GHz, and greater than-0.2 dB in the range of 0.58GHz-1.04 GHz.
The 560MHz-1120MHz butterfly-shaped vibrator type orthomode polarization coupler adopts a method of processing a circular waveguide, a vibrator structure and a bottom plate respectively. The key butterfly oscillator feed structure is divided into 4 metal array arms, 2 through hole cylindrical coaxial outer conductors, 2 grounding cylinders, 2 coaxial inner probes and two feed connecting sheets, and all parts are respectively processed and assembled. Considering the stability of the structure, the upper end and the lower end of the grounding cylinder and the through hole cylinder are respectively provided with a triangular base, each base is provided with 3 screw holes, and the base is respectively connected with the floor and the metal array arm by screws. One end of the coaxial inner probe is connected with an inner core of the SMA connector, penetrates into the hollow cylindrical coaxial outer conductor from the through hole of the bottom plate, and the other end of the coaxial inner probe is screwed into the feed connecting piece with the threaded hole, and the other side of the feed connecting piece is screwed into the metal vibrator arm connected with the grounding cylinder through a screw to form electric connection with the metal vibrator arm.
Referring to fig. 11, the reflection factor and polarization isolation obtained by using an agilent E5071C ENA series vector network analyzer are shown, wherein a black S11 curve is the reflection factor of a polarizer horizontal polarization port in the present invention, a red S22 curve is the reflection factor of a polarizer vertical polarization port in the present invention, and a blue S21 curve is the polarization coupling degree of the polarizer horizontal polarization port and vertical polarization port. The reflection factor of the polarizer is lower than-10 dB at 0.56GHz-1.12GHz, polarization isolation is better than 33dB, the in-band reflection factor is basically lower than-14 dB except the upper and lower edges of the frequency band, and no withering mode exists. In the test, the bandwidth of the butterfly vibrator orthogonal mode polarization coupler is limited by the radiation boundary condition of the waveguide opening, and in order to verify the consistency of simulation and actual measurement, the simulation result and the actual measurement result of the polarizer in the air box arranged in the radiation boundary condition are compared.
As shown in fig. 12, the rose and red S11 curves are the reflection factors of the horizontally polarized ports obtained by simulation and actual measurement, the light blue and baby blue S22 curves are the reflection factors of the vertically polarized ports obtained by simulation and actual measurement, and the gray and black S21 curves are the polarization coupling degrees of the horizontally polarized ports and the vertically polarized ports of the polarizer obtained by simulation and actual measurement, respectively. The simulation result and the actual measurement result of the polarizer under the radiation boundary condition of the waveguide port have good consistency.
A comparison of the polarizer simulation and the transmission coupling coefficients of the TE11 mode to the TEM mode of the main mode of the two polarization directions measured at normal temperature is given in connection with fig. 13. The blue and black curves are TE11 main mode transmission coupling coefficients of the horizontal polarized port obtained through simulation and actual measurement respectively, and the green and red curves are TE11 main mode transmission coupling coefficients of the vertical polarized port obtained through simulation and actual measurement. In actual measurement, two polarizer waveguide ports are connected, and the transmission coefficient of the same polarization is measured to be halved. The observed main mode coupling coefficient of TE11 mode to TEM mode is basically consistent with the simulation result, the insertion loss in the band is basically lower than 0.3dB, and the insertion loss of the upper edge and the lower edge is larger but still lower than 0.45dB due to the increase of the reflection factor. In practice, the ohmic loss of the polarizer with a pure metal structure is relatively small, and the ohmic loss of the polarizer is basically lower than 0.05dB and is not more than 0.15dB at maximum by-10 x log [ |S21|2/(1- |S11|2) ] calculation. The polarizer works on a 70K vacuum Dewar secondary refrigeration platform, and the noise introduced by the polarizer is about 5-6K in consideration of the effects of port mismatch and the like.
In summary, the invention designs a novel butterfly oscillator broadband orthogonal mode polarization coupler which has a compact structure and a length of only one fourth of the low-frequency wavelength. Compared with a common vibrator type orthomode polarization coupler commonly used in radio astronomy, the novel butterfly vibrator orthomode polarization coupler has the working bandwidth widened from 1.7:1 to 2:1. In the design, the butterfly oscillator is introduced into the waveguide for feeding for the first time, so that excitation of TM01, TE21 and TE01 modes in the circular waveguide is effectively inhibited, and the single-mode bandwidth is increased from 1.3:1 to 2.08:1.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (1)
1. The utility model provides a novel butterfly oscillator orthomode polarization coupler which characterized in that includes: the butterfly oscillator feed structure comprises a waveguide, a bottom plate fixedly arranged at the bottom of the waveguide and a pair of butterfly dipoles which are arranged on the upper end surface of the bottom plate in a crisscross manner;
the butterfly oscillator feed structure comprises 4 metal array arms, 2 hollow cylindrical coaxial outer conductors, 2 grounding cylinders, 2 coaxial inner probes and 2 feed connecting sheets; wherein, the upper and lower ends of the hollow cylindrical coaxial outer conductor and the grounding cylinder are fixedly provided with a triangular base; the hollow cylindrical coaxial outer conductor and the grounding cylinder are fixedly arranged on the bottom plate through the triangular base at the lower end of the hollow cylindrical coaxial outer conductor and the grounding cylinder respectively; 2 hollow cylindrical coaxial outer conductors and 2 grounding cylinders form a square structure with two rows and two columns on the bottom plate, and 2 hollow cylindrical coaxial outer conductors are adjacently arranged; the hollow cylindrical coaxial outer conductor and the grounding cylinder are fixedly connected with 1 metal array arm through the triangular base at the upper end of the hollow cylindrical coaxial outer conductor and the grounding cylinder respectively;
one end of each of the 2 coaxial inner probes is connected with the SMA inner core, and then penetrates into the 2 hollow cylindrical coaxial outer conductors from the through holes on the bottom plate respectively, and the coaxial inner probes and the hollow cylindrical coaxial outer conductors are placed in an insulating manner; the other end of the coaxial inner probe is connected with one end of the feed connecting sheet, and the other end of the feed connecting sheet is fixedly and electrically connected with the metal oscillator arm connected with the grounding cylinder; a feed connection sheet is connected with a coaxial inner probe in a hollow cylindrical coaxial outer conductor arranged in a diagonal line and a metal oscillator arm on a grounding cylinder;
the waveguide is a circular waveguide, and correspondingly, the circular bottom plate of the bottom plate; the circular waveguide is connected with the circular bottom plate through a screw;
the radius of the circular waveguide is 0.317 lambda 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein lambda is 0 A low frequency wavelength corresponding to the required bandwidth;
the top of the hollow cylindrical coaxial outer conductor is provided with an insulating sleeve, the outer diameter of the upper part of the insulating sleeve is larger than the outer diameter of the lower part of the insulating sleeve, and the outer diameter of the lower part of the insulating sleeve is matched with the inner diameter of the hollow cylindrical coaxial outer conductor;
and an external thread is arranged at one end of the coaxial internal probe, which is connected with the feed connecting sheet, correspondingly, a groove with an internal thread is arranged at the corresponding position of the feed connecting sheet, and the coaxial internal probe is in threaded connection with the feed connecting sheet through the external thread and the groove with the internal thread.
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