Broadband bridge

Abstract

The utility model discloses a broadband bridge, which comprises a first input port, a first output port, an isolation output port, a coupling output port, a front-stage coupling branch knot, an intermediate-stage coupling branch knot, a final-stage coupling branch knot, a dielectric layer and a metal layer, the metal layer is provided with a gold bonding wire, a microwave input transmission branch, a first microwave output transmission branch, a second microwave output transmission branch, an isolation port output branch and two independent microstrip lines. Three-stage coupling is adopted, namely, the front-stage coupling branch knot is connected and coupled with the last-stage coupling branch knot through the microstrip line, and the middle-stage coupling branch knot is connected and coupled with the independent microstrip line six-line through the gold bonding wire, so that the requirements of broadband 6-18GHz and low insertion loss are met, the standing wave characteristic is improved, the isolation degree and the direction are good and are both smaller than-20dB, and the isolation degree and the direction are smaller than-20dB. And moreover, good amplitude-phase consistency is achieved, the amplitude is 3dB + / -0.3, the phase is 91 degrees + / -5 degrees, and the overall performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a microwave communication technical field especially relates to a wide frequency band electric bridge. BACKGROUND

[0002] With the continuous development of communication technology, the carrier frequency of each communication system is continuously improved, and the frequency band is wider and wider. In the microwave communication system, the performance of the power distribution, the frequency mixer and the coupling element in the power amplifier circuit will affect the performance of the whole system. Among them, the coupling element includes the Langer bridge and the coupling mode such as the band line coupling. The traditional Langer bridge is a 3dB coupler, which realizes the 3dB coupling output of the frequency band through multi-line coupling. However, with the continuous widening of the frequency band, the coupling microstrip line width and the line gap are reduced, resulting in the increase of the bridge insertion loss and the reduction of the overall performance. SUMMARY

[0003] The main purpose of the utility model is to provide a wide frequency band electric bridge, which aims to solve the problem of the increase of the bridge insertion loss and the reduction of the overall performance caused by the continuous widening of the frequency band of the traditional Langer bridge.

[0004] In order to achieve the above purpose, the utility model provides a wide frequency band electric bridge, which comprises a first input port, a first output port, an isolation output port, a coupling output port, a front-stage coupling branch, an intermediate-stage coupling branch and a final-stage coupling branch.

[0005] A dielectric layer and a metal layer are provided, the metal layer is attached to one side of the dielectric layer, a bonding gold wire is provided on the metal layer, and a microwave input transmission branch, a first microwave output transmission branch, a second microwave output transmission branch, an isolation port output branch and two independent microstrip lines are also provided on the metal layer.

[0006] The front-stage coupling branch is connected with the final-stage coupling branch through a microstrip line.

[0007] The intermediate-stage coupling branch is connected with the six independent microstrip lines through the bonding gold wire.

[0008] In an embodiment, the intermediate-stage coupling branch comprises an input end first coupling branch, an input end second coupling branch, an output end first coupling branch, an output end second coupling branch, an isolation output end first coupling branch, an isolation output end second coupling branch, a coupling output end first coupling branch, a coupling output end second coupling branch, a first independent microstrip line coupling branch and a second independent microstrip line coupling branch.

[0009] In an embodiment, the microstrip line impedance of the first input port, the first output port, the isolation output port and the coupling output port is 50Ω.

[0010] In one embodiment, the dielectric layer includes a dielectric substrate, the dielectric substrate being made of aluminum nitride with a dielectric constant of 8.8, and the dielectric substrate having a thickness of 0.762 mm.

[0011] This utility model employs a three-stage coupling system: the front-stage coupling stubs are connected to the final-stage coupling stubs via microstrip lines, and the intermediate-stage coupling stubs are connected to the independent microstrip lines via bonding alloy wires. This system meets the requirements for a wide bandwidth of 6-18 GHz and low insertion loss, improves VSWR characteristics, and provides good isolation and directionality, both less than -20 dB. It also exhibits good amplitude and phase consistency, with an amplitude of 3 dB ± 0.3 and a phase of 91° ± 5°, thereby enhancing overall performance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the broadband bridge of this utility model;

[0013] Figure 2 This is an enlarged view of the intermediate stage coupling stub of the broadband bridge of this utility model;

[0014] Figure 3 This is a simulation diagram of the port standing wave of the broadband bridge of this utility model;

[0015] Figure 4 This is a simulation diagram of the insertion loss of the broadband bridge of this utility model;

[0016] Figure 5 This is a simulation diagram of the isolation of the broadband bridge of this utility model;

[0017] Figure 6 This is a simulation diagram of the directionality of the broadband bridge of this utility model;

[0018] Figure 7 This is a phase simulation diagram of the broadband bridge of this utility model;

[0019] In the diagram: 1-Pre-stage coupling stub, 2-Intermediate stage coupling stub, 3-Final stage coupling stub, 21-First input coupling stub, 22-Second input coupling stub, 23-First independent microstrip line coupling stub, 24-First output coupling stub, 25-Second output coupling stub, 26-First isolated output coupling stub, 27-Second isolated output coupling stub, 28-First coupled output coupling stub, 29-Second coupled output coupling stub, 210-Second independent microstrip line coupling stub, 211-Bonding wire, IN-First input port, OUT1-First output port, OUT2-Isolated output port, OUT3-Coupled output port. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The traditional Lange bridge is a 3dB coupler that achieves 3dB frequency band coupling output through multi-line coupling. However, as the frequency band continues to widen, the linewidth and gap of its coupling microstrip line decrease, resulting in increased bridge insertion loss and reduced overall performance.

[0027] To address the aforementioned problems, this invention proposes a broadband bridge. The specific embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0028] like Figures 1-7 As shown, the broadband bridge includes:

[0029] First input port IN, first output port OUT1, isolated output port OUT2, coupled output port OUT3, front-stage coupling branch 1, intermediate-stage coupling branch 2 and final-stage coupling branch 3;

[0030] The device comprises a dielectric layer and a metal layer, wherein the metal layer is attached to one side of the dielectric layer, and a bonding wire 211 is provided on the metal layer. The metal layer also comprises a microwave input transmission branch, a first microwave output transmission branch, a second microwave output transmission branch, an isolation port output branch, and two independent microstrip lines.

[0031] The preceding coupling stub 1 is connected to the final coupling stub 3 via a microstrip line;

[0032] The intermediate coupling stub 2 is connected to the independent microstrip line six-wire via the bonding wire 211.

[0033] In one embodiment, the intermediate-stage coupling stub 2 includes an input-end first coupling stub 21, an input-end second coupling stub 22, an output-end first coupling stub 24, an output-end second coupling stub 25, an isolated output-end first coupling stub 26, an isolated output-end second coupling stub 27, a coupled output-end first coupling stub 28, a coupled output-end second coupling stub 29, a first independent microstrip line coupling stub 23, and a second independent microstrip line coupling stub 210.

[0034] In one embodiment, the microstrip line impedance of the first input port IN, the first output port OUT1, the isolated output port OUT2, and the coupled output port OUT3 is 50Ω.

[0035] In one embodiment, the dielectric layer includes a dielectric substrate, the dielectric substrate being made of aluminum nitride with a dielectric constant of 8.8, and the dielectric substrate having a thickness of 0.762 mm.

[0036] In this embodiment, the microstrip line impedance of the first input port IN, the first output port OUT1, the isolated output port OUT2, and the coupled output port OUT3 of the broadband bridge is 50Ω, and the frequency range is 6~18GHz; the dielectric substrate is made of aluminum nitride material with a dielectric constant of 8.8 and a thickness of 0.762mm; the thickness of the metal layer is 0.004mm, the width of the bonding wire 211 is 0.025mm, and the width of the microstrip line is 0.82mm.

[0037] In this embodiment, the broadband bridge uses three-stage coupling to solve the insertion loss problem caused by the broadband. That is, the front-stage coupling stub 1 and the final-stage coupling stub 3 are coupled by microstrip lines, and the intermediate-stage coupling stub 2 is connected by six wires of bonding alloy wire 211 to help enhance circuit coupling. Specifically, when laying out the intermediate coupling stub 2, gold wire bonding is used to press the points, and the microstrip line is widened at the press point position. The first coupling stub 21 at the input end is directly connected to the first coupling stub 24 at the output end through the microstrip line. The front end of the second coupling stub 22 at the input end is connected to the front end of the second coupling stub 25 at the output end through the bonding wire 211. The two stubs are directly connected in the middle, so the width of the coupling microstrip line is changed at the front and rear bonding points. There is a first independent microstrip line coupling stub 23 between the first coupling stub and the second coupling stub at the input end, and the three stubs are mutually coupled. In addition, the first independent microstrip line is connected to the end of the first coupling stub 26 at the isolation output end and the front end of the second coupling stub at the coupling output end through the bonding wire 211, and is mutually coupled. Similarly, the width of the microstrip line is widened at the bonding point. Then, a second independent microstrip line coupling stub 210 is provided between the first coupling stub 24 and the second coupling stub 25 at the output end, and the three stubs are coupled to each other. The second independent microstrip line coupling stub 210 is connected to the front end of the second coupling stub 27 at the isolation output end and the end of the first coupling stub at the coupling port through a bonding wire 211, and the microstrip line width is widened at the bonding point. Finally, the end of the second coupling stub 27 at the isolation output end and the end of the second coupling stub 29 at the coupling output end are connected through a bonding wire 211, and the microstrip line width is widened at the bonding point. At this point, the coupling stubs of the four ports and the two independent microstrip coupling stubs form a six-wire system, with each pair of wires coupled to each other. The six wires are connected to each other through the bonding wire 211 to form a tight coupling, so as to achieve the required coupling strength.

[0038] In this embodiment, the coupled microstrip lines of the front and rear stages are jointly simulated with the intermediate stage. By adjusting the microstrip impedance transformation, they are matched to achieve 3dB coupling within the frequency band. To enhance the coupler's practicality, the input port, obtained by performing microstrip impedance transformation on the output microstrip linewidth of the front stage, is located in the middle of the substrate. To ensure simulation accuracy, the simulation layout needs to be exported to another simulation software for secondary simulation. The simulation results are as follows: Figures 3-7 As shown in the simulation results, it achieves a coupling degree of 3dB within the 6-18GHz range, with good flatness, amplitude consistency (less than 0.6dB), good phase consistency (less than 10°), and significantly improved standing wave characteristics. Overall, it improves the wideband performance and high insertion loss of the traditional Lange bridge, and can be widely used in microwave communication, microwave test equipment, and spectrum monitoring systems.

[0039] This utility model of a broadband bridge employs three-stage coupling: the first-stage coupling stub 1 is connected to the last-stage coupling stub 3 via a microstrip line, and the intermediate-stage coupling stub 2 is connected to the independent microstrip line six-wire via a bonding alloy wire 211. This satisfies the requirements of a wide bandwidth of 6-18GHz and low insertion loss, improves standing wave characteristics, and has good isolation and directionality, both less than -20dB. It also has good amplitude and phase consistency, with an amplitude of 3dB±0.3 and a phase of 91°±5°, thus improving overall performance.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A broadband bridge, characterized by The wideband electric bridge comprises: a first input port, a first output port, an isolation output port, a coupling output port, a front-stage coupling branch, a middle-stage coupling branch and a final-stage coupling branch; a dielectric layer and a metal layer, the metal layer being attached to one side of the dielectric layer, the metal layer being provided with a bonding gold wire, the metal layer being further provided with a microwave input transmission branch, a first microwave output transmission branch, a second microwave output transmission branch, an isolation port output branch and two independent microstrip lines; the front-stage coupling branch being connected to the final-stage coupling branch through a microstrip line; the middle-stage coupling branch being connected to the six independent microstrip lines through the bonding gold wire.

2. The wideband electrical bridge of claim 1, wherein, the middle-stage coupling branch comprising an input end first coupling branch, an input end second coupling branch, an output end first coupling branch, an output end second coupling branch, an isolation output end first coupling branch, an isolation output end second coupling branch, a coupling output end first coupling branch, a coupling output end second coupling branch, a first independent microstrip line coupling branch and a second independent microstrip line coupling branch.

3. The wideband electrical bridge of claim 1, wherein, the microstrip line impedance of the first input port, the first output port, the isolation output port and the coupling output port being 50Ω.

4. The wideband electrical bridge of claim 1, wherein, the dielectric layer comprising a dielectric layer substrate, the material of the dielectric layer substrate being aluminum nitride with a dielectric constant of 8.8, the thickness of the dielectric layer substrate being 0.762mm.

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