CN221861920U - Transition structure from strip line to grounded coplanar waveguide, radio frequency circuit and equipment - Google Patents

Abstract

The utility model discloses a transition structure and radio frequency circuit from stripline to grounded coplanar waveguide, belonging to the field of mobile communication and radar detection. The transition structure includes: a stripline part, including a first upper ground plane, a stripline guide and a first lower ground plane; a grounded coplanar waveguide part, including a second upper ground plane, a grounded coplanar waveguide guide and a second lower ground plane; the stripline guide and the grounded coplanar waveguide guide are connected, and are arranged on the first plane with the second upper ground plane; the first lower ground plane and the second lower ground plane are coplanarly connected, and the first plane is located between the first upper ground plane and the lower ground plane; a short-circuit metal column, the short-circuit metal column runs through the first upper ground plane, the first plane and the lower ground plane; wherein the first upper ground plane and the first plane constitute a stepped transition structure. The utility model proposes a transition structure from stripline to coplanar waveguide with a wide working bandwidth, low design complexity, small insertion loss and low reflection coefficient.

Description

A transition structure from stripline to grounded coplanar waveguide, radio frequency circuit and device

Technical Field

The utility model relates to the fields of mobile communication and radar detection, in particular to a transition structure from a strip line to a grounded coplanar waveguide, a radio frequency circuit and a device.

Background Art

Stripline transmission lines are widely used in various passive circuits due to their advantages such as low dispersion, strong anti-interference ability and low loss, such as using striplines to feed millimeter wave antennas. However, striplines cannot usually be directly connected to surface circuits, so it is necessary to transition the stripline transmission line to a grounded coplanar waveguide transmission line, so that it is convenient to use a probe or coaxial connector to connect to the coplanar waveguide and transition the signal to the stripline for testing. At present, there are relatively few literatures on the transition structure from stripline to grounded coplanar waveguide. The first existing literature proposes a transition structure using an alternating hole structure, but the insertion loss at 60GHz is large, reaching -1.6dB and the in-band reflection coefficient is only less than -10dB, and the impedance matching is poor. The second existing literature proposes a transition structure by etching a gradient gap on the upper metal surface. The structure is relatively complex and the loss at 60GHz is close to 0.5dB. In summary, the transition structure in the existing solution has large losses and a relatively complex structure, and it is impossible to achieve high integration between devices.

Utility Model Content

In order to solve at least one of the above technical problems, the present application provides a transition structure from stripline to grounded coplanar waveguide, a radio frequency circuit and a device. The proposed transition structure has a wide operating bandwidth range, a low reflection coefficient, a low insertion loss and a small design complexity, and can achieve high-performance integration between antennas and circuits.

To achieve the above objectives, in a first aspect, the utility model provides a transition structure from a stripline to a grounded coplanar waveguide, comprising:

a stripline portion, comprising a first upper ground plane, a stripline conductor and a first lower ground plane;

A grounded coplanar waveguide portion comprises a second upper ground plane, a grounded coplanar waveguide tape and a second lower ground plane; the stripline tape and the grounded coplanar waveguide tape are connected and arranged on a first plane together with the second upper ground plane; the first lower ground plane and the second lower ground plane are coplanarly connected, and the first plane is located between the first upper ground plane and the lower ground plane;

A short-circuit metal column, wherein the short-circuit metal column runs through the first upper ground plane, the first plane and the lower ground plane; wherein the first upper ground plane and the first plane form a stepped transition structure.

The present application realizes the transition of the electric field mode from the stripline to the grounded coplanar waveguide and prevents the electric field from leaking at the connection point, thereby reducing the insertion loss, by loading a stepped transition structure with a short-circuit metal column.

As an optional implementation manner, the short-circuit metal column is located at the connection between the stripline portion and the grounded coplanar waveguide portion.

As an optional implementation manner, the number of the short-circuit metal pillars is N, where N is ≥ 2 and is a natural number.

As an optional implementation manner, the N short-circuit metal pillars are symmetrically arranged on both sides of the stripline conductive strip.

As an optional implementation manner, the stripline portion and the grounded coplanar waveguide portion have the same characteristic impedance to achieve impedance matching.

As an optional implementation, the transition structure further includes a first dielectric substrate and a second dielectric substrate, and the area of the second dielectric substrate is larger than that of the first dielectric substrate;

The first upper ground plane is arranged on a first surface of a first dielectric substrate, and the stripline conductive strip is arranged on a second surface of the first dielectric substrate;

The grounded coplanar waveguide strip is arranged on a first surface of a second dielectric substrate, and the lower ground plane is arranged on a second surface of the second dielectric substrate.

As an optional implementation, the second upper ground plane is connected to the second lower ground plane through a grounding metal column.

As an optional implementation, the second upper ground plane includes two parts: a first metal plane and a second metal plane;

The first metal plane and the second metal plane are symmetrically arranged on both sides of the grounded coplanar waveguide strip.

In a second aspect, the utility model provides a radio frequency circuit, including the above-mentioned transition structure from a stripline to a grounded coplanar waveguide, and the radio frequency circuit includes but is not limited to an antenna, a filter, a power amplifier and a power divider.

In a third aspect, the utility model provides an electronic device, comprising the above-mentioned radio frequency circuit.

Compared with the prior art, the beneficial effects of the utility model are:

1. The design complexity of the transition structure from the stripline to the coplanar waveguide described in the utility model is low. It is only necessary to introduce a short-circuit metal column near the stripline side at the connection to achieve the transition of the electric field mode from the stripline to the coplanar waveguide.

2. The stripline to coplanar waveguide transition structure described in the present invention has a wide bandwidth range, a low reflection coefficient, and a low insertion loss, that is, the insertion loss is less than 0.3dB and the reflection coefficient is better than 21dB in the DC-60GHz range.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic diagram of a three-dimensional structure of a transition structure from a stripline to a grounded coplanar waveguide disclosed in a first embodiment of the present utility model;

FIG2 is a side perspective view of a transition structure from a stripline to a grounded coplanar waveguide disclosed in the first embodiment of the present utility model;

3 is a top view of a transition structure from a stripline to a grounded coplanar waveguide disclosed in the first embodiment of the utility model;

4 is a schematic diagram showing the variation of simulated reflection coefficient and insertion loss of a transition structure from a stripline to a grounded coplanar waveguide with frequency disclosed in the first embodiment of the present utility model;

5 is a top view of a transition structure from a stripline to a grounded coplanar waveguide disclosed in a second embodiment of the present utility model;

FIG. 6 is a side perspective view of a transition structure from a grounded coplanar waveguide to a stripline to a grounded coplanar waveguide disclosed in a third embodiment of the present invention.

Reference numerals:

1-stripline part; 11-first upper ground plane; 12-first upper dielectric substrate; 13-stripline conductor; 14-first lower dielectric substrate; 15-first lower ground plane;

2-grounded coplanar waveguide portion; 21-second upper ground plane; 211-first metal plane; 212-second metal plane; 22-grounded coplanar waveguide strip; 23-second dielectric substrate; 24-second lower ground plane; 25-grounded metal column group;

3- stepped transition structure loaded with short-circuit metal column; 31- short-circuit metal column; 32- stepped transition structure.

DETAILED DESCRIPTION

This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

For ease of understanding, a transition structure from a stripline to a grounded coplanar waveguide will be further described below in conjunction with embodiments and drawings.

First embodiment:

Please refer to Figures 1, 2 and 3 together. The embodiment of the present application discloses a transition structure from a stripline to a grounded coplanar waveguide, including a stripline portion 1, a grounded coplanar waveguide portion 2 and a stepped transition structure 3 loaded with a short-circuit metal column. The stepped transition structure is formed by directly connecting the stripline portion 1 and the grounded coplanar waveguide portion 2 of different thicknesses, and the loaded short-circuit metal column 31 is located near the connection and on one side of the stripline 1.

The stripline portion 1 comprises, from top to bottom, a first upper ground plane 11 , a first upper dielectric substrate 12 , a stripline conductive strip 13 , a first lower dielectric substrate 14 , and a first lower ground plane 15 . The stripline conductive strip 13 is located between the first upper dielectric substrate 12 and the first lower dielectric substrate 14 .

The grounded coplanar waveguide part 2 includes a second upper ground plane 21, a grounded coplanar waveguide tape 22, a second dielectric substrate 23, a second lower ground plane 24 and a grounded metal column 25. The second upper ground plane 21 includes a first metal plane 211 and a second metal plane 212, which are respectively located on both sides of the grounded coplanar waveguide tape 22 and separated by a gap. The second upper ground plane 21 and the grounded coplanar waveguide tape 22 are located on the upper surface of the second dielectric substrate 23. The grounded metal column 25 connects the second upper ground plane 21 and the second lower ground plane 24.

In some embodiments, the first upper dielectric substrate 12 , the first lower dielectric substrate 14 , and the second dielectric substrate 23 are all Rogers RT5880 (dielectric constant is 2.2, loss tangent is 0.0009), and the thickness is 0.254 mm.

The stripline conductive strip 13 is directly connected to the grounded coplanar waveguide conductive strip 22 , the first lower dielectric substrate 14 is coplanarly connected to the second dielectric substrate 23 , and the first lower ground plane 15 is coplanarly connected to the second lower ground plane 24 .

The stepped transition structure 3 loaded with the short-circuit metal column 31 has a lower stepped surface formed by the second upper ground plane 21 and the grounded coplanar waveguide strip 22 , and the stepped transition structure 3 loaded with the short-circuit metal column 31 has an upper stepped surface formed by the first upper ground plane 11 .

The stepped transition structure 3 loaded with short-circuit metal pillars 31 connects the first upper ground plane 11 and the first lower ground plane 15 through the short-circuit metal pillars 31. The short-circuit metal pillars 31 are arranged in parallel and symmetrically distributed on both sides of the connection between the stripline guide strip 13 and the grounded coplanar waveguide guide strip 22. In this embodiment, the number of short-circuit metal pillars 31 in the stepped transition structure 3 is 8.

The characteristic impedance of the stripline 1 is the same as that of the grounded coplanar waveguide 2, which is 50 ohms, thereby achieving impedance matching.

The signal is input via the stripline, passes through the transition structure, and flows into the grounded coplanar waveguide with low loss and low reflection coefficient, thereby converting the signal from the closed structure to the surface circuit, making it easier to connect probes and coaxial connectors.

Please refer to Figure 4, which shows a schematic diagram of the simulated reflection coefficient and insertion loss of a transition structure from a stripline to a grounded coplanar waveguide provided in this embodiment, which varies with frequency. It can be seen from the figure that the working range of the transition structure provided in this embodiment can be from DC to 60GHz, the insertion loss is less than 0.3dB and the reflection coefficient is better than 21dB.

Second embodiment:

A transition structure from a stripline to a grounded coplanar waveguide provided in the second embodiment of the present application is shown in FIG5 . In the second embodiment, the number of short-circuit metal pillars 31 in the stepped transition structure 3 is 6, and the remaining settings are the same as those in the first embodiment and will not be repeated here.

Third embodiment:

A transition structure from a grounded coplanar waveguide to a stripline and then to a grounded coplanar waveguide provided in the third embodiment of the present application is shown in FIG6 . In the third embodiment, the other side of the stripline 1 is again transitioned to the grounded coplanar waveguide 2, thereby realizing the transition from the grounded coplanar waveguide to the stripline and then to the grounded coplanar waveguide. The remaining settings are the same as those in the first embodiment and will not be repeated here.

Fourth embodiment:

This embodiment provides a radio frequency circuit, which includes a transition structure from a stripline to a grounded coplanar waveguide as described in the above embodiment.

The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims (10)

1. A transition structure from a stripline to a grounded coplanar waveguide, comprising: a stripline portion, comprising a first upper ground plane, a stripline conductor and a first lower ground plane; A grounded coplanar waveguide portion comprises a second upper ground plane, a grounded coplanar waveguide tape and a second lower ground plane; the stripline tape and the grounded coplanar waveguide tape are connected and arranged on a first plane together with the second upper ground plane; the first lower ground plane and the second lower ground plane are coplanarly connected, and the first plane is located between the first upper ground plane and the lower ground plane; A short-circuit metal column, wherein the short-circuit metal column runs through the first upper ground plane, the first plane and the lower ground plane; wherein the first upper ground plane and the first plane form a stepped transition structure. 2. A stripline to grounded coplanar waveguide transition structure according to claim 1, characterized in that the short-circuit metal column is located at the connection between the stripline portion and the grounded coplanar waveguide portion. 3. A stripline to grounded coplanar waveguide transition structure according to claim 1, characterized in that the number of the short-circuit metal pillars is N, where N ≥ 2 and is a natural number. 4. A stripline to grounded coplanar waveguide transition structure according to claim 3, characterized in that the N short-circuit metal pillars are symmetrically arranged on both sides of the stripline guide strip. 5. The stripline to grounded coplanar waveguide transition structure according to claim 1, wherein the stripline portion and the grounded coplanar waveguide portion have the same characteristic impedance to achieve impedance matching. 6. A stripline to grounded coplanar waveguide transition structure according to claim 1, characterized in that the transition structure further comprises a first dielectric substrate and a second dielectric substrate, and the area of the second dielectric substrate is greater than the area of the first dielectric substrate; The first upper ground plane is arranged on a first surface of a first dielectric substrate, and the stripline conductive strip is arranged on a second surface of the first dielectric substrate; The grounded coplanar waveguide strip is arranged on a first surface of a second dielectric substrate, and the lower ground plane is arranged on a second surface of the second dielectric substrate. 7 . The stripline to grounded coplanar waveguide transition structure according to claim 1 , wherein the second upper ground plane is connected to the second lower ground plane via a grounded metal column. 8. A stripline to grounded coplanar waveguide transition structure according to claim 7, characterized in that the second upper ground plane comprises a first metal plane and a second metal plane; The first metal plane and the second metal plane are symmetrically arranged on both sides of the grounded coplanar waveguide strip. 9. A radio frequency circuit, characterized by comprising a stripline to grounded coplanar waveguide transition structure as claimed in any one of claims 1 to 8. 10. An electronic device, comprising the radio frequency circuit according to claim 9.