CN114899570A - Microstrip-waveguide conversion structure with out-of-band suppression function - Google Patents
Microstrip-waveguide conversion structure with out-of-band suppression function Download PDFInfo
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- CN114899570A CN114899570A CN202210659440.2A CN202210659440A CN114899570A CN 114899570 A CN114899570 A CN 114899570A CN 202210659440 A CN202210659440 A CN 202210659440A CN 114899570 A CN114899570 A CN 114899570A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 14
- 230000001629 suppression Effects 0.000 title claims abstract description 11
- 239000000758 substrate Substances 0.000 claims description 40
- 230000007704 transition Effects 0.000 claims description 33
- 230000009466 transformation Effects 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims description 8
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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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
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a microstrip-waveguide conversion structure with an out-of-band inhibition function, which relates to the technical field of microstrip waveguide conversion and solves the technical problems that a waveguide filter is introduced during microstrip waveguide conversion and the weight and the volume of a radio frequency front end are increased; the invention adopts the tuning screw to carry out-of-band suppression, can complete the conversion of the microstrip waveguide, does not need to additionally introduce a waveguide filter, and reduces the volume and the weight of the radio frequency front end.
Description
Technical Field
The invention relates to the technical field of microstrip waveguide conversion, in particular to the technical field of a microstrip-waveguide conversion structure with an out-of-band inhibition function.
Background
The radio frequency front end is a series of components between a radio frequency transceiver and an antenna, and mainly comprises a receiving module and a transmitting module, wherein the receiving module is used for receiving signals propagated in space, and the transmitting module is used for transmitting the signals.
When a solid-state power amplifier is used as a transmitting module, the output of the microstrip circuit needs to be converted into a waveguide port so that the signal is matched with a feed source port of an antenna as much as possible when the signal is connected with the feed source port, and therefore energy loss is reduced.
At present, the connection mode from the output port of the microstrip circuit to the feed port of the antenna mainly includes the following two modes:
(1) the microstrip is converted into the waveguide for transition, and then the external duplexer is connected for filtering, wherein the duplexer adopts a waveguide filter or a cavity filter to suppress the low-frequency noise of the transmitting module so as to reduce the interference to the receiving module, but the additional addition of the waveguide filter or the cavity filter can increase the weight and the volume of the radio frequency front end and is not beneficial to the miniaturization of the radio frequency front end;
(2) a microstrip filter is adopted at a power amplifier output microstrip circuit port to inhibit out-of-band interference, noise interference of a power amplifier module to a receiver is reduced, and then microstrip-waveguide conversion is carried out, however, insertion loss of the microstrip filter is relatively large in Ku and Ka frequency bands of a satellite communication common tube, generally in the magnitude of 2-3 dB, for example, a 40W power amplifier can lose more than 10W energy, and the extra insertion loss of the microstrip filter reduces the performance of a radio frequency front end.
Disclosure of Invention
The invention aims to: in order to solve the above technical problem, the present invention provides a microstrip-waveguide conversion structure with out-of-band rejection.
The invention specifically adopts the following technical scheme for realizing the purpose:
the utility model provides a microstrip-waveguide transform structure with outband suppression function, includes input rectangular waveguide and output rectangular waveguide, input rectangular waveguide and output rectangular waveguide form the short circuit face along the one end of waveguide direction of transmission, the broadside of input rectangular waveguide is connected with the microstrip probe, the one end that the short circuit face was kept away from to input rectangular waveguide is connected with the one end that output rectangular waveguide has the short circuit face, the broadside grafting of output rectangular waveguide has a plurality of tuning screws that distribute along the narrow limit direction of output rectangular waveguide, tuning screw extends to in the output rectangular waveguide, and is specific, form the rectangular hole on the short circuit face of output rectangular waveguide, rectangular hole and input rectangular waveguide phase-match.
Further, the input rectangular waveguide is a non-standard waveguide, and the output rectangular waveguide is a standard waveguide.
And further, the rectangular waveguide filter further comprises a rectangular transition waveguide, wherein one end of the rectangular transition waveguide along the waveguide transmission direction is connected with the input rectangular waveguide, and the other end of the rectangular transition waveguide is connected with the output rectangular waveguide.
Further, the rectangular transition waveguide is rectangular.
Furthermore, the rectangular transition waveguide is formed by sequentially cascading at least two layers of rectangular waveguides, a step is formed at the joint of adjacent rectangular waveguides, and the rectangular sections of the rectangular waveguides of the rectangular transition waveguide are sequentially increased along the waveguide transmission direction.
Furthermore, when the rectangular transition waveguide is composed of a plurality of layers of rectangular waveguides, each layer of step forms a transition short-circuit surface, and a layer of through hole matched with the rectangular waveguide is formed on the transition short-circuit surface.
Further, the end with the smallest rectangular section of the rectangular transition waveguide is connected with the input rectangular waveguide, and the end with the largest rectangular section of the rectangular transition waveguide is connected with the output rectangular waveguide.
Further, the tuning screw comprises an upper screw, a middle screw and a lower screw, the upper screw and the lower screw are arranged at the center position of the output rectangular waveguide, the middle screw is arranged at a position deviated from the center position of the output rectangular waveguide, and the distance between the middle screw and the upper screw along the waveguide transmission direction is equal to the distance between the middle screw and the lower screw along the waveguide transmission direction.
Furthermore, the input rectangular waveguide comprises an upper cavity and a lower cavity, the short-circuit surface of the input rectangular waveguide is arranged on the upper cavity, a medium substrate A is arranged between the upper cavity and the lower cavity, the medium substrate A is connected with a medium substrate B, the medium substrate B is arranged along the narrow edge of the rectangular waveguide, and the microstrip probe is arranged on the medium substrate A and the medium substrate B.
Further, the cross-sectional shapes of the upper cavity, the dielectric substrate a and the lower cavity in the radial direction are the same, that is, the cross-sectional shapes perpendicular to the waveguide transmission direction are the same.
Further, the microstrip probe comprises a 50 ohm strip line and an impedance transformation line which are arranged on the medium substrate B, the 50 ohm strip line and the impedance transformation line are coaxially connected, the impedance transformation line and the 50 ohm strip line are arranged along the direction of the narrow side of the rectangular waveguide, the impedance transformation line extends to the medium substrate A, a radiation unit is arranged at the end of the impedance transformation line, and a plurality of matching points, namely matching branches, are arranged on the medium substrate A.
Furthermore, matching points are arranged at the lower end of the impedance transformation line and at two sides of the radiation unit along the width direction of the rectangular waveguide.
Furthermore, a constraint cavity is arranged on the medium substrate B.
Further, the restraint cavity and the upper cavity are integrally formed.
Further, the cross-sectional shapes of the confinement cavity and the dielectric substrate B in the radial direction are the same
The invention has the following beneficial effects:
(1) the tuning screw can carry out-of-band suppression on a receiving frequency band, on one hand, a waveguide filter is not required to be additionally introduced, so that the volume and the weight of the radio frequency front end are reduced, on the other hand, a micro-strip filter is not required to be added, so that the additional insertion loss is avoided, and the performance of the radio frequency front end is improved;
(2) the microstrip probe has a plurality of discontinuous matching points, can form a plurality of transmission poles, and has the advantages of good in-band matching and low insertion loss;
(3) the rectangular transition waveguide has a good transition effect, and the out-of-band rejection capability is further improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention (with the upper chamber removed);
reference numerals: 1-output rectangular waveguide, 2-tuning screw, 3-lower cavity, 4-upper cavity, 5-constraint cavity, 6-dielectric substrate B, 7-dielectric substrate A, 8-rectangular transition waveguide, 9-50 ohm strip line, 10-impedance transformation line, 11-radiation unit and 12-matching point.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the embodiment provides a microstrip-waveguide conversion structure with an out-of-band suppression function, including an input rectangular waveguide and an output rectangular waveguide 1, the input rectangular waveguide and the output rectangular waveguide 1 form a short-circuit surface along one end of the waveguide transmission direction, the wide side of the input rectangular waveguide is connected with a microstrip probe, one end of the input rectangular waveguide, which is far away from the short-circuit surface, is connected with one end of the output rectangular waveguide 1, which has the short-circuit surface, the wide side of the output rectangular waveguide 1 is inserted with a plurality of tuning screws 2 distributed along the narrow side direction of the output rectangular waveguide 1, the tuning screws 2 extend into the output rectangular waveguide 1, specifically, a rectangular hole is formed on the short-circuit surface of the output rectangular waveguide 1, and the rectangular hole is matched with the input rectangular waveguide.
Preferably, the input rectangular waveguide and the output rectangular waveguide 1 are formed in a step shape.
The input rectangular waveguide is a non-standard BJ180 and the output rectangular waveguide 1 is a standard BJ 120.
Preferably, the input rectangular waveguide and the output rectangular waveguide 1 are made of aluminum plate.
Example 2
Referring to fig. 1, the present embodiment is further improved on the basis of embodiment 1, and specifically includes a rectangular transition waveguide 8, where one end of the rectangular transition waveguide 8 along the waveguide transmission direction is connected to the input rectangular waveguide, and the other end is connected to the output rectangular waveguide 1.
Example 3
Referring to fig. 1, the present embodiment is further improved on the basis of embodiment 2, specifically, the rectangular transition waveguide 8 is formed by sequentially cascading at least two layers of rectangular waveguides, a step is formed at a connection position of adjacent rectangular waveguides, and rectangular cross sections of the rectangular waveguides of the rectangular transition waveguide 8 are sequentially increased along the waveguide transmission direction.
Preferably, the end of the rectangular transition waveguide 8 with the smallest rectangular cross section is connected with the input rectangular waveguide and the end with the largest rectangular cross section is connected with the output rectangular waveguide 1.
Example 4
Referring to fig. 1, this embodiment is further improved on the basis of embodiment 3, specifically, the tuning screw 2 includes an upper screw, a middle screw and a lower screw, the upper screw and the lower screw are disposed at the center position of the output rectangular waveguide 1, the middle screw is disposed at a position offset from the center position of the output rectangular waveguide 1, and the distance between the middle screw and the upper screw along the waveguide transmission direction is equal to the distance between the middle screw and the lower screw along the waveguide transmission direction.
Example 5
Referring to fig. 1, this embodiment is further improved on the basis of embodiment 4, and specifically, the input rectangular waveguide includes an upper cavity 4 and a lower cavity 3, a short-circuit surface of the input rectangular waveguide is disposed on the upper cavity 4, a dielectric substrate a7 is disposed between the upper cavity 4 and the lower cavity 3, the dielectric substrate a7 is connected to a dielectric substrate B6, the dielectric substrate B6 is disposed along a narrow edge of the input rectangular waveguide, and the microstrip probe is disposed on the dielectric substrate a7 and the dielectric substrate B6.
Preferably, the upper chamber 4, the dielectric substrate a7 and the lower chamber 3 have the same cross-sectional shape in the radial direction.
Preferably, media substrate A7 and media substrate B6 are made of 0.2mm 4003 sheet material.
Preferably, the media substrate a7 and the media substrate B6 are integrally formed and have a T-shaped cross-section in the radial direction.
Example 6
Referring to fig. 1 and fig. 2, this embodiment is further improved on the basis of embodiment 5, specifically, the microstrip probe includes a 50 ohm strip line 9 and an impedance transformation line 10 which are disposed on a dielectric substrate B6, the 50 ohm strip line 9 and the impedance transformation line 10 are coaxially connected, the impedance transformation line 10 and the 50 ohm strip line 9 are disposed along a narrow side direction of an input rectangular waveguide, the impedance transformation line 10 extends onto a dielectric substrate a7, an end of the impedance transformation line 10 is provided with a radiation unit 11, a plurality of matching points 12 are disposed on the dielectric substrate a7, and the radiation unit 11 is made of lead-tin material and is subjected to silver plating.
Preferably, the radiation unit 11 is a rectangular sheet disposed along the width direction of the input rectangular waveguide.
Example 7
Referring to fig. 1 and fig. 2, this embodiment is further improved on the basis of embodiment 6, specifically, matching points 12 are provided at the lower end of the impedance transformation line 10 and at both sides of the radiation unit 11 along the width direction of the input rectangular waveguide.
Example 8
Referring to fig. 1, this embodiment is further improved on the basis of embodiment 7, specifically, a confinement cavity 5 is disposed on the dielectric substrate B6, and the confinement cavity 5 is used for confining a microwave signal and preventing the microwave signal from radiating outward.
Preferably, the confinement chamber 5 and the upper chamber 4 are integrally formed.
Preferably, the confined chamber 5 and the media substrate B6 have the same cross-sectional shape in the radial direction.
The working principle is as follows: the tuning screw 2 can perform out-of-band suppression on a receiving frequency band, so that on one hand, a waveguide filter is not required to be additionally introduced, the volume and the weight of the radio frequency front end are reduced, on the other hand, a micro-strip filter is not required to be added, the additional insertion loss is avoided, and the performance of the radio frequency front end is improved; the micro-strip probe has a plurality of discontinuous matching points 12, can form a plurality of transmission poles, and has the advantages of good in-band matching and low insertion loss; the rectangular transition waveguide 8 has a good transition effect, and the out-of-band rejection capability is further improved.
Claims (10)
1. The utility model provides a microstrip-waveguide transform structure with outband suppression function, its characterized in that, includes input rectangular waveguide and output rectangular waveguide (1), input rectangular waveguide and output rectangular waveguide (1) form the short circuit face along the one end of waveguide direction of transmission, the broadside of input rectangular waveguide is connected with the microstrip probe, the one end that input rectangular waveguide kept away from the short circuit face is connected with the one end that output rectangular waveguide (1) has the short circuit face, the broadside grafting of output rectangular waveguide (1) has a plurality of tuning screws (2) of following the distribution of output rectangular waveguide (1) narrow side direction, tuning screw (2) extend to in the output rectangular waveguide (1).
2. The microstrip-waveguide conversion structure with out-of-band rejection function according to claim 1, further comprising a rectangular transition waveguide (8), wherein one end of the rectangular transition waveguide (8) along the waveguide transmission direction is connected to the input rectangular waveguide, and the other end is connected to the output rectangular waveguide (1).
3. The microstrip-waveguide transition structure with out-of-band suppression function according to claim 2, wherein said rectangular transition waveguide (8) is rectangular.
4. The microstrip-waveguide conversion structure with out-of-band rejection function according to claim 2, wherein said rectangular transition waveguide (8) is formed by sequentially cascading at least two layers of rectangular waveguides and the connection of adjacent rectangular waveguides forms a step.
5. The microstrip-waveguide transition structure with out-of-band rejection function according to claim 4, wherein the end with the smallest rectangular cross section of the rectangular transition waveguide (8) is connected with the input rectangular waveguide and the end with the largest rectangular cross section is connected with the output rectangular waveguide (1).
6. The microstrip-waveguide transition structure with out-of-band suppression function according to any one of claims 1 to 5, wherein the tuning screw (2) comprises an upper screw, a middle screw and a lower screw, the upper screw and the lower screw are arranged at the center position of the output rectangular waveguide (1), the middle screw is arranged at the center position of the output rectangular waveguide (1), and the distance between the middle screw and the upper screw along the waveguide transmission direction is equal to the distance between the middle screw and the lower screw along the waveguide transmission direction.
7. The microstrip-waveguide transition structure with out-of-band rejection function according to any one of claims 1 to 5, wherein the input rectangular waveguide comprises an upper cavity (4) and a lower cavity (3), the short-circuit surface of the input rectangular waveguide is arranged on the upper cavity (4), a dielectric substrate A (7) is arranged between the upper cavity (4) and the lower cavity (3), the dielectric substrate A (7) is connected with a dielectric substrate B (6), the dielectric substrate B (6) is arranged along the narrow side of the input rectangular waveguide, and the microstrip probe is arranged on the dielectric substrate A (7) and the dielectric substrate B (6).
8. The microstrip-waveguide conversion structure with out-of-band rejection function according to claim 7, wherein said microstrip probe comprises a 50 ohm strip line (9) and an impedance transformation line (10) which are arranged on a dielectric substrate B (6), said 50 ohm strip line (9) and said impedance transformation line (10) are coaxially connected, said impedance transformation line (10) and said 50 ohm strip line (9) are arranged along the direction of the narrow side of the input rectangular waveguide, said impedance transformation line (10) extends to the dielectric substrate A (7), the end of said impedance transformation line (10) is provided with a radiation unit (11), and said dielectric substrate A (7) is provided with a plurality of matching points (12).
9. The microstrip-waveguide transition structure with out-of-band rejection function according to claim 8, wherein the lower end of the impedance transformation line (10) and the two sides of the radiation unit (11) along the width direction of the input rectangular waveguide are provided with matching points (12).
10. The microstrip-waveguide transition structure with out-of-band suppression function according to claim 8, wherein said dielectric substrate B (6) is provided with a confinement cavity (5).
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| CN202210659440.2A CN114899570B (en) | 2022-06-13 | 2022-06-13 | Microstrip-waveguide conversion structure with out-of-band suppression function |
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