CN212517467U - Slot line microstrip converter - Google Patents
Slot line microstrip converter Download PDFInfo
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- CN212517467U CN212517467U CN202021133865.2U CN202021133865U CN212517467U CN 212517467 U CN212517467 U CN 212517467U CN 202021133865 U CN202021133865 U CN 202021133865U CN 212517467 U CN212517467 U CN 212517467U
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- microstrip
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- transmission line
- gradual change
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Abstract
The utility model discloses a slotline microstrip converter, including the base plate, set up in the positive microstrip line of base plate and set up in the slotline at the base plate back, the base plate back still be provided with the gradual change transmission line of microstrip line symmetry, the axis and the slotline mutually perpendicular of gradual change transmission line. The utility model discloses a gradual change transmission line has realized slot line microstrip converter structure, and this structure is based on little reflection theory to can effectively improve the bandwidth. The utility model discloses but wide application in the power combiner field.
Description
Technical Field
The utility model relates to a power combiner technical field especially relates to a slot line microstrip converter.
Background
The existing T-shaped slot line microstrip converter needs to use a mode of connecting a microstrip matching section and a quarter transmission line in series to realize high-resistance to low-resistance impedance conversion. Since the quarter-wave transmission line does not belong to a broadband device. Therefore, the prior art solution cannot be applied to wideband design. If the existing scheme is used to realize slot line microstrip conversion, the overall bandwidth of the power amplifier module is greatly reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, the present invention provides a slot-line microstrip converter.
The utility model adopts the technical proposal that:
the slot line microstrip converter comprises a substrate, a microstrip line arranged on the front side of the substrate and a slot line arranged on the back side of the substrate, wherein a gradually-changed transmission line symmetrical to the microstrip line is further arranged on the back side of the substrate, and the central axis of the gradually-changed transmission line is perpendicular to the slot line.
According to some embodiments of the utility model, the base plate is including metal level and dielectric layer, the metal level set up in the front of dielectric layer, the microstrip line set up in on the metal level, the slot line with the gradual change transmission line set up in on the back of dielectric layer.
According to some embodiments of the invention, the center of the tapered transmission line is further provided with an inductive element.
According to some embodiments of the present invention, the symmetrical point of the gradual change transmission line is connected with two centrosymmetric open-circuit transmission lines.
According to some embodiments of the invention, the input end of the slot line is connected to a short-circuit line of a quarter-slot line wavelength length.
According to some embodiments of the invention, the open transmission line is arc-shaped.
The utility model has the advantages that:
the utility model relates to a slotline microstrip converter has realized slotline microstrip converter structure through the gradual change transmission line, and this structure is based on little reflection theory to can effectively improve the bandwidth.
Drawings
Fig. 1 is a schematic structural diagram of a slot-line microstrip converter according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the present invention provides a 3 microstrip slot line converters, including base plate 1, set up in 1 positive microstrip line 2 of base plate and set up in the slot line 3 at the base plate 1 back, the base plate 1 back still is provided with the gradual change transmission line symmetrical with microstrip line 2, the axis and the 3 mutually perpendicular of slot line of gradual change transmission line.
In this embodiment, the back of the PCB board at the connection is symmetrically disposed with a tapered transmission line, wherein a central axis of the tapered transmission line is orthogonal to the slot line 3, as shown in fig. 1. The tapered transmission line is implemented in the Klopfenstein form in this embodiment, because the tapered transmission line can implement impedance matching in the shortest length by means of the microstrip width taper. Meanwhile, the frequency response is shown as high pass because the gradual change transmission line is based on the small reflection design theory. This configuration facilitates a broadband design.
In this embodiment, the utility model relates to a 3 microstrip converters of slotline have realized 3 microstrip converter structures of slotline through gradual change transmission line and the transmission line 4 of opening a way, and this structure is based on little reflection theory to can effectively improve the bandwidth, the transmission line 4 of opening a way provides certain imaginary part for matching impedance in addition, lets the circuit have better matching effect.
In some embodiments, the substrate 1 includes a metal layer and a dielectric layer, the metal layer is disposed on a front surface of the dielectric layer, the microstrip line 2 is disposed on the metal layer, and the slot line 3 and the tapered transmission line are disposed on a back surface of the dielectric layer.
In some embodiments, the center of the tapered transmission line is further provided with an inductive element.
In the design of the slot line 3-microstrip converter, the end impedance of the microstrip intersecting the slot line 3 needs to provide a sufficient imaginary part if impedance matching is to be achieved. And the impedance matching of the reactance cannot be realized by the gradual change transmission line. Therefore, an inductive element needs to be added at the center of the tapered transmission line to achieve impedance matching at the end face.
In some embodiments, two open transmission lines 4 with central symmetry are connected to the tapered transmission lines at the symmetry points.
In the present embodiment, the open transmission line 4 is arc-shaped. Two centrosymmetric arc-shaped open-circuit transmission lines 4 are used at the symmetrical points of the gradual change transmission line. As a microstrip inductance, the open-circuited transmission line 4 supplements the tapered transmission line as a reactive part when impedance matching. The arc of the open transmission line 4 should be as large as possible to avoid coincidence with the slot line 3. This effectively avoids interference of the open line with the propagation mode of the slot line 3. Meanwhile, the width of the open-circuit transmission line 4 should be as wide as possible to avoid radiation loss caused by the tail end of the open-circuit transmission line 4, and the open-circuit transmission line 4 provides a certain imaginary part for matching impedance, so that the circuit has a better matching effect.
In some embodiments, the input end of the slot line 3 is connected to a short-circuit line of a quarter of the wavelength length of the slot line 3.
From the above, the present invention realizes a slot line 3 microstrip converter structure through a gradual change transmission line, which is based on the theory of small reflection, thereby effectively improving the bandwidth.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (6)
1. A slot-line microstrip converter is characterized in that: the microstrip line transmission line comprises a substrate, a microstrip line arranged on the front surface of the substrate and a slot line arranged on the back surface of the substrate, wherein the back surface of the substrate is also provided with a gradual change transmission line symmetrical to the microstrip line, and the central axis of the gradual change transmission line is perpendicular to the slot line.
2. The slot-line microstrip transition of claim 1, wherein: the substrate comprises a metal layer and a dielectric layer, the metal layer is arranged on the front side of the dielectric layer, the microstrip line is arranged on the metal layer, and the slot line and the gradient transmission line are arranged on the back side of the dielectric layer.
3. The slot-line microstrip transition of claim 1, wherein: and an inductive element is also arranged in the center of the gradual change transmission line.
4. The slot-line microstrip transition of claim 1, wherein: the input end of the slot line is connected with a short-circuit line with the wavelength length of a quarter of the slot line.
5. The slot-line microstrip transition of claim 1, wherein: and two open circuit transmission lines with central symmetry are connected at the symmetrical points of the gradual change transmission line.
6. The slot-line microstrip transition of claim 5, wherein: the open circuit transmission line is arc-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021133865.2U CN212517467U (en) | 2020-06-18 | 2020-06-18 | Slot line microstrip converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021133865.2U CN212517467U (en) | 2020-06-18 | 2020-06-18 | Slot line microstrip converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212517467U true CN212517467U (en) | 2021-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021133865.2U Active CN212517467U (en) | 2020-06-18 | 2020-06-18 | Slot line microstrip converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212517467U (en) |
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2020
- 2020-06-18 CN CN202021133865.2U patent/CN212517467U/en active Active
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