An ultra-wideband 3dB cavity bridge

Abstract

The present invention provides an ultra-wideband 3dB cavity bridge, belonging to the field of bridge technology. The ultra-wideband 3dB cavity bridge comprises: a cavity; a temperature sensor disposed within the cavity; inner conductors, including a first inner conductor and a second inner conductor disposed within the cavity; a bottom insulating support bar for supporting the first inner conductor; and an insulating support assembly for maintaining the spacing between the coupling regions of the first and second inner conductors. The insulating support assembly comprises a first insulating support bar and a second insulating support bar, the first insulating support bar having an inclined surface that abuts against an edge of the bottom surface of the second inner conductor in the width direction. The second insulating support bar has multiple bosses of varying heights for supporting the bottom surface of the second inner conductor. The first and second insulating support bars are controlled to adjust their respective positions in the width direction of the second inner conductor according to the temperature measured by the temperature sensor. The present invention can maintain the stability of bridge performance during temperature changes.

Description

Technical Field

[0001] The present application relates to the technical field of bridges, and in particular to an ultra-wideband 3dB cavity bridge. Background Art

[0002] Cavity bridges are widely used in microwave communications due to their low loss, high power, low intermodulation, and high stability. In ultra-wideband communications (UWB), 3dB stripline cavity bridges play a key role in power division and matching. The 3dB cavity bridge with a stripline structure has inherent broadband characteristics. Compared to microstrip structures, striplines can provide a wider impedance matching range, making them suitable for ultra-wideband systems and able to meet the broadband requirements of UWB communications and radar applications. The stripline structure has lower conductor loss and performs better at high frequencies than microstrip or coaxial structures. Cavity shielding reduces external interference, improves signal integrity, and reduces losses.

[0003] Some ultra-wideband communications operate in environments subject to significant temperature fluctuations, such as those ranging from room temperature to 85°C. Typically, temperature compensation circuits or heat dissipation structures are designed into the bridge to accommodate these temperature fluctuations. However, existing technologies generally focus on compensating the inner conductors within the bridge, lacking research on the impact of temperature fluctuations on the spacing between the two coupled inner conductors. This spacing directly affects the characteristic impedance and coupling strength of the inner conductors, thus affecting the performance of the bridge. Summary of the Invention

[0004] An object of the present invention is to provide an ultra-wideband 3dB cavity bridge capable of maintaining bridge performance stability when the temperature changes.

[0005] Another object of the present invention is to reduce dielectric loss, reduce microwave signal attenuation, and improve bandwidth stability.

[0006] A further object of the present invention is to reduce costs and structural complexity while ensuring the required accuracy.

[0007] An embodiment of the present invention provides an ultra-wideband 3dB cavity bridge, comprising:

[0008] cavity;

[0009] a temperature sensor, disposed in the cavity;

[0010] An inner conductor, comprising a first inner conductor and a second inner conductor disposed in the cavity;

[0011] a bottom insulating support bar for supporting the first inner conductor;

[0012] An insulating support assembly for maintaining the spacing between the coupling areas of the first inner conductor and the second inner conductor, the insulating support assembly comprising a first insulating support bar and a second insulating support bar, the first insulating support bar being formed with a sloped surface that abuts against an edge in the width direction of the bottom surface of the second inner conductor, the second insulating support bar being provided with a plurality of bosses of different heights for supporting the bottom surface of the second inner conductor, the first insulating support bar and the second insulating support bar being controlled to adjust their respective positions in the width direction of the second inner conductor according to the measured temperature of the temperature sensor to maintain the spacing between the first inner conductor and the second inner conductor unchanged.

[0013] Optionally, the insulating support assembly includes a driving mechanism for driving the first insulating support bar and the second insulating support bar to move.

[0014] Optionally, the driving mechanism includes a first differential head and a second differential head respectively installed on both sides of the width direction of the cavity, the output end of the first differential head is connected to the first insulating support bar, the output end of the second differential head is connected to the second insulating support bar, and the screwing ends of the first differential head and the second differential head are exposed to the outside of the cavity.

[0015] Optionally, the boss and the inclined surface are respectively located on two sides of the second inner conductor in the width direction.

[0016] Optionally, the first insulating support strip and the second insulating support strip are arranged at intervals along the length direction of the coupling region.

[0017] Optionally, the number of the insulating support assembly is 1, and the distance between the first insulating support bar and the second insulating support bar is greater than or equal to 1 / 3 of the length of the coupling region.

[0018] Optionally, there are multiple insulating support assemblies.

[0019] Optionally, the first insulating support strip and the second insulating support strip are made of the same material.

[0020] Optionally, the first insulating support bar and the second insulating support bar are both made of polytetrafluoroethylene.

[0021] Optionally, a transition area is provided between two adjacent bosses.

[0022] The present invention provides a cavity bridge with an adjustable insulating support assembly. When the first insulating support bar and the second insulating support bar expand due to temperature changes, causing the distance between the first inner conductor and the second inner conductor to increase, the height of the second inner conductor is adjusted by moving the first insulating support bar and the second insulating support bar, so that the distance between the first inner conductor and the second inner conductor remains constant, thereby eliminating the change in coupling strength caused by large temperature changes, thereby ensuring the stability of the bridge performance.

[0023] Furthermore, the insulating support assembly includes a first insulating support strip and a second insulating support strip, which jointly support the second inner conductor through an inclined surface and a boss. Compared with the cantilever-type insulating support strip in the prior art, the contact area between the inclined surface and the boss and the second inner conductor is greatly reduced, thereby effectively reducing dielectric loss and reducing microwave signal attenuation. Even PTFE materials with a low dielectric loss factor will still affect high-frequency signals. Therefore, in ultra-wideband application scenarios, this technical solution that significantly reduces the contact area between the insulating support and the inner conductor can further optimize the Q value and improve signal transmission quality. In addition, the smaller contact area can also reduce parasitic capacitance, reduce the fluctuation of the 3dB voltage divider point at different frequencies, and improve bandwidth stability.

[0024] Furthermore, by reasonably setting the position of the boss and the inclined surface, the number of insulating support components, or the spacing between the first insulating support bar and the second insulating support bar, the second inner conductor can be better supported, and the uniformity of the spacing between the first inner conductor and the second inner conductor in the length direction of the coupling area can be achieved, thereby further ensuring the stability of the bridge performance.

[0025] Furthermore, a transition zone is provided between adjacent bosses, allowing the second inner conductor to smoothly move to the adjacent boss when the second insulating support bar is moved. Furthermore, in complex environments where temperatures fluctuate, the second inner conductor can smoothly move left and right, adapting to complex application scenarios involving high and low temperature switching.

[0026] Furthermore, the present application uses a micrometer head as a driving mechanism to achieve the movement of the first and second insulating support bars and precisely control the amount of displacement. This solution of using an existing micrometer head in combination with manual operation can reduce costs and structural complexity while ensuring the required accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the internal structure of an ultra-wideband 3dB cavity bridge according to one embodiment of the present invention;

[0028] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0029] Figure 3 for Figure 1 Cross-sectional view at the middle BB;

[0030] Figure 4 for Figure 3 A partial enlarged view of point D in the middle;

[0031] Figure 5 for Figure 1 A partial enlarged view of point C in the middle;

[0032] Reference numerals:

[0033] 100-ultra-wideband 3dB cavity bridge, 10-cavity, 20-temperature sensor 20, 30-first inner conductor, 40-second inner conductor, 50-bottom insulating support bar, 60-first insulating support bar, 61-inclined surface, 70-second insulating support bar, 71-boss, 72-transition region, 80-first differential head, 81-output end, 82-screw end, 83-fixed seat, 831-scale, 90-second differential head. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0037] In this application, unless otherwise expressly specified or limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, a first feature being “above,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0039] According to the knowledge of bridge theory, the characteristic impedance Z0 of the stripline cavity bridge can be approximately expressed by the following formula:

[0040]

[0041] Among them, ε r is the dielectric constant of the insulating material between the two inner conductors, d is the distance between the two inner conductors, and w is the width of the inner conductor.

[0042] Therefore, the distance between the two inner conductors of the stripline cavity bridge is one of the key dimensions that determine the characteristic impedance. Therefore, ensuring the stability of the distance between the two inner conductors is a key factor in ensuring the coupling strength of the bridge.

[0043] In some use scenarios with a large temperature variation range, the insulating material between the two inner conductors will be affected by temperature and significantly affect the coupling strength. Although it is possible to select some materials that are less affected by temperature (i.e., materials with a small thermal expansion coefficient), it is difficult for existing commonly used bridge insulation materials to take into account low thermal expansion coefficient, low dielectric constant and low dielectric loss factor tanδ. For example, aluminum oxide and aluminum nitride materials have low thermal expansion coefficient and dielectric loss factor, but high dielectric constant; polytetrafluoroethylene (PTFE) has low dielectric loss factor and dielectric constant, but high thermal expansion coefficient. The prior art has a research direction that focuses on meeting the requirements of bridge use by developing new materials. This application adapts to large temperature change scenarios by adopting existing commonly used dielectric materials. That is, materials with low dielectric constant and dielectric loss factor are selected, and the performance degradation caused by temperature change is adapted by structural design.

[0044] On the basis of the above technical concept, the inventors further studied the influence of changes in the inner conductor and the insulating support inside the cavity within a larger temperature change range. Assuming that the original thickness of the insulating support is d0, the original width of the inner conductor is w0, the thickness change of the insulating support (the insulating support provided between the two inner conductors to determine the spacing between the inner conductors) caused by temperature change is Δd, and the width change of the inner conductor is Δw. When Δd / d0 is less than 2%, it can be considered that the deformation of the insulating support caused by temperature change will basically not affect the accuracy of the bridge. When Δw / w0 is less than 2%, it can be considered that the deformation of the inner conductor caused by temperature change will basically not affect the accuracy of the bridge. Since the materials of the insulating support and the inner conductor are different, it is assumed that the material of the insulating support is PTFE, and the corresponding thermal expansion coefficient is 100*10 -6 ppm / ℃, the inner conductor is made of copper, and the corresponding thermal expansion coefficient is 16.5*10 -6 ppm / ℃, so when the temperature changes by more than 20℃, the thermal expansion of the insulating bracket will obviously affect the bridge accuracy, while the inner conductor will only obviously affect the bridge accuracy when the temperature changes by more than 120℃. Therefore, in the range of 20℃-85℃, the effect caused by the thermal expansion of the inner conductor can be ignored, while the adverse effect of the thermal expansion of the insulating bracket should be considered.

[0045] In order to minimize or eliminate the negative impact of thermal expansion of the insulating bracket on the bridge performance (characteristic impedance and coupling strength), the present application provides the following technical solution, which can compensate for the adverse effects caused by temperature changes through the special structural design of the insulating bracket between the two inner conductors.

[0046] Figure 1 FIG. 1 is a schematic diagram of the internal structure of an ultra-wideband 3dB cavity bridge 100 according to an embodiment of the present invention. Figure 2 for Figure 1 Cross-sectional view at AA in the middle. Figure 3 for Figure 1 Cross-sectional view at the middle BB. Figure 4 for Figure 3 A partial enlarged view of point D in the middle. Figure 1As shown, in one embodiment, the ultra-wideband 3dB cavity bridge 100 includes a cavity 10, a temperature sensor 20, an inner conductor, a bottom insulating support bar 50 and an insulating support assembly. The temperature sensor 20 is disposed in the cavity 10, for example, fixed to the inner wall of the cavity 10 by fasteners. The inner conductor includes a first inner conductor 30 and a second inner conductor 40 disposed in the cavity 10. The first inner conductor 30 and the second inner conductor 40 are designed according to factors such as the operating frequency band and impedance matching. The first inner conductor 30 and the second inner conductor 40 include coupling areas that overlap in the longitudinal direction, and there is a distance between the two. The bottom insulating support bar 50 is used to support the first inner conductor 30. The bottom insulating support bar 50 can adopt the cantilever support in the prior art, that is, its two ends in the length direction are respectively connected to the side walls of the cavity 10, and fasteners or direct overlap can be used. The insulating support assembly is used to maintain the distance between the coupling areas of the first inner conductor 30 and the second inner conductor 40. The insulating support assembly includes a first insulating support bar 60 and a second insulating support bar 70. As shown Figure 2 As shown, the first insulating support strip 60 is formed with an inclined surface 61, and the inclined surface 61 abuts against the edge of the bottom surface of the second inner conductor 40 in the width direction, as shown in FIG. Figure 3 As shown, the second insulating support bar 70 is provided with a plurality of bosses 71 of different heights for supporting the bottom surface of the second inner conductor 40. It should be noted that, at a certain temperature, there is always only one boss 71 of a certain height in contact with the bottom surface of the second inner conductor 40. Figure 4 As shown, the plurality of bosses 71 can form a continuous staircase shape. The first insulating support strip 60 and the second insulating support strip 70 are controlled to adjust their respective positions in the width direction of the second inner conductor 40 according to the temperature measured by the temperature sensor 20 to maintain a constant spacing between the first inner conductor 30 and the second inner conductor 40.

[0047] The adjustment principle of the insulating support assembly is: first, establish a correspondence between temperature and the first insulating support bar 60 and the second insulating support bar 70, so that the adjustment amount of the first insulating support bar 60 and the second insulating support bar 70 at a certain temperature can be found based on the correspondence. This correspondence can be obtained based on theoretical analysis, or determined based on simulation or experiment.

[0048] The process of establishing the corresponding relationship between temperature and the first insulating support bar 60 and the second insulating support bar 70 through theoretical analysis is as follows:

[0049] Divide the operating temperature range [AB] into n segments, which can be equally divided or the higher the temperature, the smaller the segment range;

[0050] Then, the height change Δh of the inclined surface 61 of the first insulating support bar 60 is calculated based on the thermal expansion coefficient C1 of the first insulating support bar 60 and the temperature difference ΔT0 of each section. The calculation formula of Δh is:

[0051] Δh=C1*d1*ΔT0;

[0052] Optionally, d1 is taken as the thickness at the midpoint of the inclined surface 61;

[0053] Then, the lateral displacement Δx of the first insulating support bar 60 (the displacement in the width direction of the second inner conductor 40 ) is calculated based on the height change Δh and the angle α between the inclined surface 61 and the horizontal. The calculation formula of Δx is:

[0054] Δx=Δh / tanα;

[0055] The height of each boss 71 is set according to the thermal expansion coefficient C2 of the second insulating support bar 70 and the temperature difference ΔT0 of each section. The width of each boss 71 in the width direction of the first inner conductor 30 is the same, and the width of each boss 71 is k.

[0056] The above method establishes a corresponding relationship between each temperature and the first and second insulating support bars 60 and 70. When the temperature sensor 20 detects the current temperature, the movement distance of the first and second insulating support bars 60 and 70 is determined according to the temperature range in which the current temperature is located. The first and second insulating support bars 60 and 70 are then driven to move manually or automatically. Precision automatic or manual methods can be used to achieve the movement of the first and second insulating support bars 60 and 70, such as precision motors or precision screws.

[0057] This embodiment provides a cavity bridge with an adjustable insulating support assembly. When the first insulating support bar 60 and the second insulating support bar 70 expand due to temperature changes and the distance between the first inner conductor 30 and the second inner conductor 40 increases, the height of the second inner conductor 40 is adjusted by moving the first insulating support bar 60 and the second insulating support bar 70, so that the distance between the first inner conductor 30 and the second inner conductor 40 remains constant, thereby eliminating the change in coupling strength caused by large temperature changes, thereby ensuring the stability of the bridge performance.

[0058] Furthermore, the insulating support assembly of this embodiment includes a first insulating support strip 60 and a second insulating support strip 70, which jointly support the second inner conductor 40 through the inclined surface 61 and the boss 71. Compared with the cantilever-type insulating support strip in the prior art, the contact area between the inclined surface 61 and the boss 71 and the second inner conductor 40 is greatly reduced, thereby effectively reducing dielectric loss and reducing microwave signal attenuation. Even PTFE materials with a low dielectric loss factor will still affect high-frequency signals. Therefore, in ultra-wideband application scenarios, this technical solution that significantly reduces the contact area between the insulating support and the inner conductor can further optimize the Q value and improve signal transmission quality. In addition, the smaller contact area can also reduce parasitic capacitance, reduce the fluctuation of the 3dB voltage divider point at different frequencies, and improve bandwidth stability.

[0059] In a further embodiment, the boss 71 and the inclined surface 61 are located on opposite sides of the second inner conductor 40 in the width direction. The first insulating support bar 60 and the second insulating support bar 70 are spaced apart along the length of the coupling region. In other embodiments, multiple insulating support assemblies may be arranged along the length of the coupling region. When the number of insulating support assemblies is one, the spacing between the first insulating support bar 60 and the second insulating support bar 70 is greater than or equal to 1 / 3 of the length of the coupling region.

[0060] This embodiment can better support the second inner conductor 40 by reasonably setting the positions of the boss 71 and the inclined surface 61, the number of insulating support components, or the spacing between the first insulating support bar 60 and the second insulating support bar 70, thereby achieving uniformity in the spacing between the first inner conductor 30 and the second inner conductor 40 in the length direction of the coupling area, thereby further ensuring the stability of the bridge performance.

[0061] In one embodiment, a transition region 72 is provided between two adjacent bosses 71. For example, an arc or an inclined surface is provided between the two adjacent bosses 71. This allows the second inner conductor 40 to smoothly move to the adjacent boss 71 when the second insulating support bar 70 is moved. Furthermore, in complex environments where the temperature fluctuates, the second inner conductor 40 can smoothly move left and right, adapting to complex application scenarios involving high and low temperature switching.

[0062] In one embodiment, the first insulating support strip 60 and the second insulating support strip 70 are made of the same material, thereby ensuring consistency in the insulating support material properties, such as consistency in thermal expansion deformation, facilitating displacement calculation, and reducing the number of material types, thereby reducing material complexity. Of course, in other embodiments, the first insulating support strip 60 and the second insulating support strip 70 may also be made of different materials, and this is not a limitation here.

[0063] Figure 5 for Figure 1In a further embodiment, the insulating support assembly includes a driving mechanism for driving the first insulating support bar 60 and the second insulating support bar 70 to move. Figure 5 As shown, in this embodiment, the driving mechanism includes a first differential head 80 and a second differential head 90 respectively installed on both sides of the width direction of the cavity 10, the output end 81 of the first differential head 80 is connected to the first insulating support bar 60, and the output end 81 of the second differential head 90 is connected to the second insulating support bar 70, and the screwing ends 82 of the first differential head 80 and the second differential head 90 are exposed to the outside of the cavity 10.

[0064] Since the differential head (precision screw) has a precise adjustment function, the adjustment accuracy of the existing mature differential head can reach 1 μm. A differential head of this precision can meet the use requirements of this application.

[0065] Generally, the differential head includes a fixed seat 83, a differential cylinder (i.e., a screwing end 82) and a measuring screw (i.e., an output end 81). By screwing the differential cylinder, the measuring screw can be moved slightly to realize the measurement function. In this embodiment, the differential head is used as a driving mechanism, and its fixed seat 83 is fixedly installed on the cavity 10. The differential cylinder and its scaled portion are exposed in the cavity 10, and the end of the measuring screw abuts against the first insulating support bar 60 or the second insulating support bar 70, thereby driving the first insulating support bar 60 or the second insulating support bar 70 to move. Figure 5 As shown, the fixing base 83 is also provided with a scale 831 to allow the user to precisely control the rotation angle. A micrometer head is generally used as a measuring tool. Since the first insulating support bar 60 and the second insulating support bar 70 in this application are relatively thin and lightweight, the use of a micrometer head can achieve their movement and precisely control small displacements. This solution of combining an existing micrometer head with manual operation can reduce costs and structural complexity while maintaining the required accuracy.

[0066] Of course, in other embodiments, motors, transmissions, etc. can be used to achieve displacement control of the first insulating support bar 60 and the second insulating support bar 70, thereby replacing manual operation. However, the structural complexity and cost are relatively high.

[0067] In one embodiment, the bridge operates at a frequency of 5 GHz to 15 GHz and at a temperature range of 5°C to 85°C, divided equally into four sections. The temperature difference ΔT0 between each section is set to 20°C. Each bottom insulating support bar 50 , first insulating support bar 60 , and second insulating support bar 70 are made of polytetrafluoroethylene. The first inner conductor 30 and second inner conductor 40 are both made of copper. The initial spacing between the first inner conductor 30 and the second inner conductor 40 is 2 mm. The angle α between the inclined surface 61 and the horizontal is set to 45°, such that Δx = Δh, thereby simplifying control.

[0068] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An ultra-wideband 3dB cavity bridge, characterized in that: include: cavity; a temperature sensor, disposed in the cavity; An inner conductor, comprising a first inner conductor and a second inner conductor disposed in the cavity; a bottom insulating support bar, used to support the first inner conductor; An insulating support assembly for maintaining the spacing between the coupling areas of the first inner conductor and the second inner conductor, the insulating support assembly comprising a first insulating support bar and a second insulating support bar, the first insulating support bar being formed with a sloped surface that abuts against an edge in the width direction of the bottom surface of the second inner conductor, the second insulating support bar being provided with a plurality of bosses of different heights for supporting the bottom surface of the second inner conductor, the first insulating support bar and the second insulating support bar being controlled to adjust their respective positions in the width direction of the second inner conductor according to the measured temperature of the temperature sensor to maintain the spacing between the first inner conductor and the second inner conductor unchanged.

2. The ultra-wideband 3dB cavity bridge according to claim 1, characterized in that: The insulating support assembly includes a driving mechanism for driving the first insulating support bar and the second insulating support bar to move.

3. The ultra-wideband 3dB cavity bridge according to claim 2, characterized in that: The driving mechanism includes a first differential head and a second differential head respectively installed on both sides of the width direction of the cavity, the output end of the first differential head is connected to the first insulating support bar, the output end of the second differential head is connected to the second insulating support bar, and the screwing ends of the first differential head and the second differential head are exposed to the outside of the cavity.

4. The ultra-wideband 3dB cavity bridge according to any one of claims 1 to 3, characterized in that: The boss and the inclined surface are respectively located on both sides of the second inner conductor in a width direction.

5. The ultra-wideband 3dB cavity bridge according to any one of claims 1 to 3, characterized in that: The first insulating support strip and the second insulating support strip are arranged at intervals along a length direction of the coupling region.

6. The ultra-wideband 3dB cavity bridge according to claim 5, characterized in that: The number of the insulating support assembly is 1, and the distance between the first insulating support bar and the second insulating support bar is greater than or equal to 1 / 3 of the length of the coupling region.

7. The ultra-wideband 3dB cavity bridge according to claim 5, characterized in that: There are multiple insulating support components.

8. The ultra-wideband 3dB cavity bridge according to claim 1, characterized in that: The first insulating support strip and the second insulating support strip are made of the same material.

9. The ultra-wideband 3dB cavity bridge according to claim 8, characterized in that: The first insulating support bar and the second insulating support bar are both made of polytetrafluoroethylene.

10. The ultra-wideband 3dB cavity bridge according to claim 1, characterized in that: A transition area is provided between two adjacent bosses.

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