CN217062470U

CN217062470U - Signal transmission structure and radio frequency signal receiving equipment

Info

Publication number: CN217062470U
Application number: CN202220476672.XU
Authority: CN
Inventors: 谢倩倩; 王绍龙; 王冲; 武景; 夏寒; 张磊; 张燎
Original assignee: Nanjing Hawkeye Electronic Technology Co Ltd
Current assignee: Nanjing Hawkeye Electronic Technology Co Ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-07-26
Anticipated expiration: 2032-03-04

Abstract

The utility model discloses a signal transmission structure and a radio frequency signal receiving device, wherein the signal transmission structure comprises a coaxial connector, and the transmission structure is detachably connected with the coaxial connector; the microstrip line is abutted with the transmission structure; the transmission structure and the microstrip line are arranged on the surface of the substrate, and the coaxial connector is arranged at one end of the substrate. The utility model discloses a signal conduction body is with the detachable signal conduction body that is connected to of coaxial joint to through signal conduction body and microstrip line connection, make coaxial joint can used repeatedly. On the other hand, the width of the maximum cross section of the signal conductor is larger than that of the probe in the coaxial connector, so that the probe is aligned with the microstrip line.

Description

Signal transmission structure and radio frequency signal receiving equipment

Technical Field

The utility model relates to a radio frequency technology field especially relates to a signal transmission structure and radio frequency signal receiving equipment.

Background

The rectangular waveguide has the advantages of small conductor loss, large power capacity, no radiation loss, simple structure, easy manufacture and the like, and is widely applied to systems of communication, radar, remote sensing, electronic countermeasure, measurement and the like of a microwave frequency band and a millimeter wave frequency band of 3000 MHz-300 GHz. Almost all microwave devices used waveguide or coaxial lines before the 50's of the 20 th century. With the development of millimeter wave technology, millimeter wave hybrid integrated circuits and monolithic integrated circuits are widely used in communication, radar, guidance and other systems.

At present, in millimeter wave technology, microstrip transmission lines are replacing metal waveguides in more and more occasions, and become important transmission lines for manufacturing millimeter wave integrated circuits. In the millimeter wave system using MMICs, microstrip lines are used for connection between the MMICs. The existing millimeter wave test system usually adopts a rectangular waveguide interface, which requires that a rectangular waveguide-to-microstrip transition with low cost, low loss and easy manufacturing is found in a system using an MMIC. The transition structures commonly used at present are: step ridge waveguide transition, ridge to fin line transition, coupled probe transition, etc. These transition structures have a wide bandwidth and low insertion loss.

The microstrip-probe-waveguide transition structure has low insertion loss, small standing wave and good repeatability, and is a transition structure which is most widely applied in a millimeter wave planar integrated circuit. In the structure, a microstrip probe is transformed to a microstrip line through a section of high-impedance line, and an electromagnetic field in the waveguide is coupled to the microstrip by using a section of probe with a coupling function. The short-circuit surface of the rectangular waveguide away from the lambda/4 transition probe ensures that the probe is at the maximum voltage, namely the position with the strongest electric field, in the waveguide. The medium substrate penetrates through the rectangular waveguide and is fixed on the test cavity, and positioning guarantee is provided for the substrate.

Because the wavelength at millimeter wave band is short, the loss of microstrip form is big, the processing is not good for the size is little, consequently select the waveguide for use mostly in antenna and microstrip test of W frequency channel, waveguide test port and test instrument adaptation more easily, and the loss that brings is very little, but can bring extra resonance point when microstrip-waveguide switching, when carrying out antenna test, this kind of condition will make the resonance point of switching structure and the resonance point mutual interference of antenna, be unfavorable for developing of research work.

Common millimeter wave band microstrip-coaxial transition structure is used for low frequency, the double sided board more, and coaxial probe adopts the form of end feed or side feed, and is in the same place with the feeder welding, but the coaxial joint price at the W wave band is slightly higher, and it is obviously not suitable for welding operation only to test the use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a signal transmission structure and radio frequency signal receiving equipment can solve present coaxial joint high price, advances the test and uses the unsuitable problem that carries out welding operation.

According to an aspect of the utility model provides a signal transmission structure, signal transmission structure includes base plate, coaxial joint, signal conduction body and microstrip line, coaxial joint with a side end face looks butt of base plate, signal conduction body with the detachable connection of coaxial joint, the microstrip line is located a side of base plate on the surface and with signal conduction body butt.

The coaxial connector further comprises a first connecting part, a second connecting part and a third connecting part, wherein the first connecting part is a probe, and the second connecting part is of a tubular structure taking the probe as the center of a circle; the third connecting portion is disposed on a surface of the substrate, and a connecting hole is disposed on the third connecting portion.

Furthermore, the signal conductor is of a tubular structure, the signal conductor is provided with a first via hole, the first via hole is used for being connected with the first connecting portion, and the second connecting portion is matched with the first connecting portion and sleeved on the outer surface of the signal conductor.

Further, the transition structure includes a ground layer, on which second via holes are provided, and the at least one second via hole penetrates through the substrate and the ground layer in a thickness direction, so that the ground layer is electrically connected to the ground layer of the substrate.

Furthermore, a third via hole is further formed in the ground layer, the third connecting portion abuts against the ground layer, the third via hole and the connecting hole are arranged oppositely, and the coaxial connector is fixed on the substrate in a threaded mode.

Further, the maximum cross-sectional width of the first connection portion ranges from one-half to two-thirds of the maximum cross-sectional width of the signal conductor.

Further, the maximum cross-sectional width of the signal conductor is smaller than the line width of the microstrip line.

Further, the maximum cross-sectional width of the signal conductor is less than two-thirds of the line width of the microstrip line.

Further, the substrate comprises at least a first dielectric sheet layer and a second dielectric sheet layer, wherein the thickness of the first dielectric sheet layer is smaller than the thickness of the second dielectric sheet layer.

Further, the coaxial connector and the signal conductor form a coaxial transition structure.

According to the utility model discloses an on the other hand, the utility model discloses still provide a radio frequency signal receiving equipment, radio frequency signal receiving equipment includes the utility model discloses arbitrary embodiment signal transmission structure.

The utility model has the advantages of, through the signal conduction body with the detachable signal conduction body that is connected to of coaxial joint to through signal conduction body and microstrip line connection, make coaxial joint can used repeatedly. On the other hand, the width of the maximum cross section of the signal conductor is larger than that of the probe in the coaxial connector, so that the probe is aligned with the microstrip line.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a top view of a signal transmission structure provided by an embodiment of the present invention;

fig. 2 is a side view of a signal transmission structure provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a coaxial connector according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a signal conductor provided by an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically, electrically or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

As shown in fig. 1, it is a schematic structural diagram of a signal transmission structure provided by an embodiment of the present invention. The signal transmission structure includes: a substrate 70, a coaxial connector 10, a signal conductor 20 and a microstrip line 30.

Illustratively, the coaxial connector 10 abuts against one side end face of the substrate 70, the signal conductor 20 is detachably connected to the coaxial connector 10, and the microstrip line 30 is located on one side surface of the substrate 70 and abuts against the signal conductor 20.

Specifically, the coaxial connector 10 includes a first connection portion 11, a second connection portion 12, and a third connection portion 13, wherein the first connection portion 11 is a probe, the second connection portion 12 is a tubular structure with the probe as a center, the third connection portion 13 is disposed on a surface of the substrate 70, and a connection hole is disposed on the third connection portion 13. In the embodiment, the diameter of the probe is 0.127mm, the southwest microwave 2492-04A-6 type coaxial connector 10 is adopted as the coaxial connector 10, the size of the coaxial connector 10 is small, the signal reflection phenomenon caused in the directional diagram pitching surface test is greatly reduced, and the accuracy of the directional diagram test can be ensured to the maximum extent.

Illustratively, the signal conductor 20 is a tubular structure, and the signal conductor 20 is provided with a first via hole 21, the first via hole 21 is used for connecting the first connection portion 11, and the second connection portion 12 is matched with the first connection portion 11 and sleeved on the outer surface of the signal conductor 20. In this embodiment, the width of the cross section of the signal conductor 20 is 0.2mm, which is advantageous to ensure that the probe can be completely placed on the central feeder. Exemplarily, the maximum cross-sectional width of the first connection portion 11 ranges from one half to two thirds of the maximum cross-sectional width of the signal conductor 20.

In an embodiment, the transition structure includes a ground layer 50, and second vias 40 are disposed on the ground layer 50, and the at least one second via 40 penetrates through the substrate 70 and the ground layer 50 in a thickness direction, so that the ground layer 50 is electrically connected to the ground layer 50 of the substrate 70.

Illustratively, a third via 60 is further disposed on the ground layer 50, the third connection portion 13 abuts against the ground layer 50, and the third via 60 is disposed opposite to the connection hole, so as to fix the coaxial connector 10 on the substrate 70 by means of a screw. The edges of the ground plane shown in fig. 1 are right angle corners, which may also be non-right angles in other embodiments, such as curved corners.

Illustratively, the maximum cross-sectional width of the signal conductor 20 is smaller than the line width of the microstrip line 30.

The maximum cross-sectional width of the signal conductor 20 is less than two thirds of the line width of the microstrip line 30. Because the diameter of the probe of the coaxial connector 10 is small, when the probe is directly aligned with the microstrip line 30, the central line of the microstrip line 30 cannot be aligned easily, the signal conductor 20 serves as a transition structure, the diameter of the transition structure is directly larger than that of the probe, and the error range from the transition structure to the two ends of the microstrip line 30 is smaller than that from the probe to the two ends of the microstrip line 30, so that the transition structure is favorable for accurate alignment.

Illustratively, the substrate 70 comprises a first dielectric sheet layer 71 and a second dielectric sheet layer 72, wherein the thickness of the first dielectric sheet layer 71 is less than the thickness of the second dielectric sheet layer 72. Because the utility model discloses a coaxial joint 10 constitutes coaxial transition structure with signal conductor 20. Therefore, the substrate 70 may include multiple layers, in the prior art, only one layer of the substrate 70 may be provided in the non-coaxial transition structure, and the thickness of the substrate 70 is small and easy to bend, and after the coaxial transition structure is adopted, the substrate 70 may include multiple layers to increase the thickness of the substrate 70, so that the entire substrate 70 is not easy to bend.

The utility model discloses a signal conduction body is with the detachable signal conduction body that is connected to of coaxial joint to through signal conduction body and microstrip line connection, make coaxial joint can used repeatedly. On the other hand, the width of the maximum cross section of the signal conductor is larger than that of the probe in the coaxial connector, so that the probe is aligned with the microstrip line.

The utility model also provides a radio frequency signal receiving equipment, radio frequency signal receiving equipment includes above-mentioned embodiment signal transmission structure.

The display panel provided by the embodiment of the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying a specific example, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be changes in the specific embodiments and the application range, and in summary, the content of the present specification should not be understood as a limitation to the present invention.

Claims

1. A signal transmission structure is characterized by comprising a substrate, a coaxial connector, a signal conductor and a microstrip line, wherein the coaxial connector is abutted against one side end face of the substrate, the signal conductor is detachably connected with the coaxial connector, and the microstrip line is located on one side surface of the substrate and abutted against the signal conductor.

2. The signal transmission structure according to claim 1, wherein the coaxial connector comprises a first connection portion, a second connection portion and a third connection portion, wherein the first connection portion is a probe, and the second connection portion is a tubular structure with the probe as a center; the third connecting portion is disposed on a surface of the substrate, and a connecting hole is disposed on the third connecting portion.

3. The signal transmission structure according to claim 2, wherein the signal conductor is a tubular structure, and the signal conductor is provided with a first via hole for connecting the first connection portion, and the second connection portion is sleeved on the outer surface of the signal conductor in cooperation with the first connection portion.

4. The signal transmission structure according to claim 2, further comprising a ground layer, wherein second vias are provided on the ground layer, and the at least one second via penetrates through the substrate and the ground layer in a thickness direction so as to electrically connect the ground layer with the ground layer of the substrate.

5. The signal transmission structure according to claim 4, wherein a third via hole is further disposed on the ground layer, the third connection portion abuts against the ground layer, the third via hole is disposed opposite to the connection hole, and the coaxial connector is fixed on the substrate by a thread.

6. The signal transmission structure according to claim 2, wherein the maximum cross-sectional width of the first connection portion ranges from one-half to two-thirds of the maximum cross-sectional width of the signal conductor.

7. The signal transmission structure according to claim 6, wherein a maximum cross-sectional width of the signal conductor is smaller than a line width of the microstrip line.

8. The signal transmission structure according to claim 7, wherein a maximum cross-sectional width of the signal conductor is less than two-thirds of a line width of the microstrip line.

9. The signal transmission structure according to claim 1, wherein the substrate includes at least a first dielectric sheet layer and a second dielectric sheet layer, wherein a thickness of the first dielectric sheet layer is smaller than a thickness of the second dielectric sheet layer.

10. The signal transmission structure according to claim 1, wherein the coaxial connector and the signal conductor constitute a coaxial transition structure.