Harmonic detection dual-band ultra-wideband filtering power divider

Abstract

The utility model discloses a harmonic detection dual-band ultra-wideband filtering power divider, which comprises a first dielectric substrate and a second dielectric substrate, the first dielectric substrate and the second dielectric substrate form a square main body, a second metal grounding layer is arranged on the upper surface of the first dielectric substrate and the second dielectric substrate, and a second metal grounding layer is arranged on the upper surface of the second dielectric substrate. The quasi-coaxial connection structure comprises an inner conductor and an outer wall. The inner conductor is formed by metalized through holes, the outer wall is formed by adding a circle of outer grounding columns on the periphery of the inner conductor, and the outer grounding columns penetrate through the second dielectric substrate and are connected with the two metal grounding layers. S-to-X band ultra-wideband filtering and power distribution module integration is realized through the dielectric substrate, and the filtering characteristic and the power distribution characteristic are directly realized in the module under the condition of reducing external matching circuits; compared with a traditional filtering power divider, the filtering power divider has the advantages of being small in size, wide in bandwidth, high in isolation, easy to process and low in cost.

Description

Technical Field

[0001] The utility model relates to the field of radio frequency communication and microwave technology, in particular to a harmonic detection dual-band ultra-wideband filtering power distributor. Background Art

[0002] A power divider is a passive device used to distribute a single input signal to multiple output ports. Its common application scenarios include antenna arrays, test equipment, communication systems, and radar systems. It is one of the key passive devices in many microwave circuits and RF systems. The most useful power divider is the Wilkinson power divider, which has good isolation between the two output ports. However, its relative bandwidth is usually less than 20%. Due to the rapid development of ultra-wideband technology for short-range wireless communications, people have a great interest in exploring various ultra-wideband microwave devices operating in the ultra-wideband (UWB) band (usually 3.1~10.6 GHz). So far, some broadband power dividers have been developed. Generally, broadband power dividers can be realized by cascading multi-stage matching networks on the two output ports of a single Wilkinson power divider. But this method requires more isolation resistors to achieve good output port isolation.

[0003] At present, the inevitable trend of the development of passive microwave devices is to achieve excellent performance and multifunctional design with the smallest possible area. Therefore, the research on filter power dividers has become a hot topic. Filter power dividers are a passive device widely used in radio frequency communication systems. They have the functions of simultaneously realizing signal filtering and power distribution, solving the disadvantages of excessive size when traditional power dividers and filters are cascaded, and adapting to the needs of integration, miniaturization, and multifunctionality. With the development of 5G and future 6G communication technologies, the performance requirements for filters and power dividers in wireless communication systems are getting higher and higher. Microstrip filter power dividers, as a microwave component that combines the functions of filters and power dividers, can not only realize signal distribution, but also filter out unnecessary signals or interference while distributing. Therefore, they have very important application value in complex radio frequency communication systems. Utility Model Content

[0004] The technical problem solved by the utility model is to overcome the defects mentioned in the background technology and provide a harmonic detection dual-band ultra-wideband filtering power distributor.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a harmonic detection dual-band ultra-wideband filtering power divider, comprising a first dielectric substrate, a second dielectric substrate and a quasi-coaxial connection structure, wherein the first dielectric substrate and the second dielectric substrate form a square body, a second metal grounding layer is arranged on the upper surface of the second dielectric substrate, and a first metal grounding layer is arranged on the lower surface of the first dielectric substrate and the second dielectric substrate, and the quasi-coaxial connection structure comprises an inner conductor and an outer wall; the inner conductor is composed of a metallized through hole, and the outer wall is realized by adding a circle of external grounding posts around the inner conductor, the external grounding posts penetrate the second dielectric substrate, and the external grounding posts connect the two metal grounding layers; a quarter-wavelength input branch, a quarter-wavelength microstrip branch transmission line, a second-order half-wavelength microstrip ladder resonant line respectively located on two branch lines, a quarter-wavelength microstrip parallel double line, a quarter-wavelength first output branch and a second output branch, and a signal isolation resistor connected across the two branch lines are arranged on the upper surface of the first dielectric substrate; an isolation resistor is arranged between the first impedance converter and the second impedance converter.

[0006] Furthermore, two quarter-circumference arc structures are used on the branch line, and second-order half-wavelength microstrip step resonant lines are etched on the branch line respectively, and the second-order half-wavelength microstrip step resonant line and the output branch are connected by a quarter-wavelength microstrip parallel coupled double line.

[0007] Furthermore, the relative dielectric constant of the first dielectric substrate is 2.2, and the loss tangent value is 0.0009.

[0008] Furthermore, the structure of the first impedance converter is composed of a plurality of microstrip line sections in cascade, and the first impedance converter and the second impedance converter have the same structure.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The ultra-wideband filtering and power distribution module of the S to X bands is integrated through a dielectric substrate, and the filtering characteristics and power distribution characteristics are directly realized inside the module while reducing the external matching circuit; compared with the traditional filtering power divider, this embodiment has the characteristics of small size, wide bandwidth, high isolation, easy processing and low cost, which is consistent with the future trend of high integration and miniaturization of circuits, and is suitable for application in miniaturized, ultra-wideband, high-isolation S to X band products. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of a harmonic detection dual-band ultra-wideband filter power divider provided in this embodiment;

[0012] Figure 2Schematic diagram of a top view of an S- to X-band ultra-wideband filter power divider in an embodiment;

[0013] Figure 3 Schematic diagram of the main view of the S-to-X-band ultra-wideband filter power divider in the embodiment;

[0014] Figure 4 It is a simulation diagram of the return loss and insertion loss S parameters of the S to X band ultra-wideband filter power divider in the embodiment;

[0015] Figure 5 Graph showing the isolation results of the S- to X-band ultra-wideband filtering power divider in the embodiment.

[0016] Numbers in the figure:

[0017] 1. First dielectric substrate; 2. First output branch; 3. Branch transmission line; 4. Second dielectric substrate; 5. Isolation resistor; 6. Quasi-coaxial connection structure; 7. External grounding column; 8. Second impedance transformer; 9. First impedance transformer; 10. Second metal grounding layer; 11. First metal grounding layer; 12. Second output branch. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-3The utility model provides a technical solution: a harmonic detection dual-band ultra-wideband filtering power divider, including a power distribution structure, a filtering structure, a signal isolation structure and a coaxial connector structure. The power distribution structure, the filtering structure and the signal isolation structure are integrated on a dielectric substrate and receive and send signals through a coaxial connector. The filtering power divider comprises: a first dielectric substrate 1 and a second dielectric substrate 4, the first dielectric substrate 1 and the second dielectric substrate 4 form a square body, a second metal grounding layer 10 is arranged on the upper surface of the second dielectric substrate 4, and a first metal grounding layer 11 is arranged on the lower surface of the first dielectric substrate 1 and the second dielectric substrate 4, and a quasi-coaxial connection structure 6 comprises an inner conductor and an outer wall; the inner conductor is composed of a metallized through hole, and the outer wall is realized by adding a circle of external grounding columns 7 around the outer periphery of the inner conductor, the external grounding columns 7 penetrate the second dielectric substrate 4, and the external grounding columns 7 connect the two metal grounding layers; a quarter-wavelength input branch, a quarter-wavelength microstrip branch transmission line 3, a second-order half-wavelength microstrip ladder resonant line respectively located on the two branch lines, a quarter-wavelength microstrip parallel double line, a quarter-wavelength first output branch 2 and a second output branch 12, and a signal isolation resistor 5 connected across the two branch lines are arranged on the upper surface of the first dielectric substrate; an isolation resistor 5 is arranged between the first impedance converter 9 and the second impedance converter 8.

[0020] Two quarter-circumference arc structures are used on the branch line, and second-order half-wavelength microstrip step resonant lines are etched on the branch line respectively. The second-order half-wavelength microstrip step resonant line and the output branch are connected by a quarter-wavelength microstrip parallel coupled double line.

[0021] The relative dielectric constant of the first dielectric substrate 1 is 2.2, and the loss tangent value is 0.0009.

[0022] The structure of the first impedance converter 9 is composed of a plurality of microstrip line sections in cascade, and the first impedance converter 9 has the same structure as the second impedance converter 8 .

[0023] Specifically, the filter power divider is an ultra-wideband filter power divider covering S-band to X-band.

[0024] When applied, since the impedance of the three ports of the filter power divider in this design is 50 ohms, it is only necessary to adjust the impedance of the external device to 50 ohms to achieve impedance matching between the external device and the filter power divider in this design to obtain a good low insertion loss effect.

[0025] In this embodiment, an ultra-wideband filtering power divider module for the S to X bands is realized by etching a microstrip line on a PCB and welding an isolation resistor. The ultra-wideband filtering characteristics and power distribution characteristics can be directly realized inside the module while reducing external isolation and matching circuits. Compared with traditional filtering power dividers, the present filtering power divider has the characteristics of high integration, small size, wide bandwidth, high isolation, simple process and low cost, and can directly realize the function of filtering power division. It is consistent with the trend of high integration and miniaturization of future circuits, and is suitable for miniaturized and highly isolated S to X band products.

[0026] like Figure 1 As shown, the relative dielectric constant of the first dielectric substrate 1 is 2.2, and the loss tangent value is 0.0009;

[0027] In an example of this embodiment, for the first dielectric substrate 1, the dielectric substrate is made of Rogers RT / duroid 5880 (tm) material, with a relative dielectric constant of 2.2, a loss tangent value of 0.0009, and a thickness of 0.508 mm.

[0028] like Figure 1 , Figure 2 As shown, in one embodiment, isolation resistors are provided at inner ends of two impedance transformers close to each other.

[0029] The two impedance converters have the same structure, namely a first impedance converter 9 and a second impedance converter 8 , that is, an isolation resistor 5 is provided between the first impedance converter 9 and the second impedance converter 8 .

[0030] The isolation resistor 5 can balance the two output ports of the power divider and play an isolation role. If the circuit is open or short-circuited, the reflected power is absorbed by the isolation resistor 5. The resistance value of the isolation resistor 5 can be flexibly selected according to the simulation experiment results of the isolation degree of the power divider, and no specific limitation is made here.

[0031] In an example of this embodiment, taking the first impedance converter 9 as an example, the structure of the first impedance converter 9 is composed of a plurality of microstrip line cascades, and the working frequency band of the power divider is affected by the length of each section of the first impedance converter 9 and the front end length of the first output branch 2; as the length of one section of the first impedance converter 9 changes, the working frequency band of the power divider also changes, and the changing rule is related to the wavelength. The first impedance converter 9 not only plays the role of impedance conversion, but also is equivalent to a resonator for controlling the working frequency band. The front end length of the output branch will also affect the working frequency band of the power divider. As the front end length increases, the frequency band moves toward low frequency, and the front end length can be used to adjust the frequency band of the power divider.

[0032] In an example of this embodiment, the isolation resistor 5 is in a square shape with a side length of 0.8 mm.

[0033] Specifically, the structures of the two impedance converters are the same. Taking the first impedance converter 9 as an example, the structure of the first impedance converter 9 is composed of a plurality of microstrip line sections cascaded.

[0034] In one embodiment, the quasi-coaxial connection structure 6 includes an inner conductor and an outer wall;

[0035] The outer wall is an external grounding column 7 disposed around the inner conductor and located on the second dielectric substrate 4 , so that the impedance of the quasi-coaxial connection structure 6 can be adjusted by adjusting the distance between the metallized through hole and the external grounding column 7 .

[0036] In this embodiment, the quasi-coaxial connection structure 6 can be composed of an inner conductor and an outer wall. The inner conductor is composed of a metallized through hole, which serves as a signal line to electrically connect the coplanar waveguide feeding structure and the power divider of the filter, that is, the output port of the filter and the input port of the power divider; and the outer wall is realized by adding a circle of external grounding posts 7 around the outer periphery of the inner conductor. The external grounding posts 7 penetrate the second dielectric substrate 4 and connect two metal grounding layers, that is, the second metal grounding layer 10 and the first metal grounding layer 11. By adjusting the distance between the metallized through hole of the inner conductor and the external grounding post 7, the quasi-coaxial connection structure 6 has a 50 ohm characteristic, that is, the impedance matching of the two device filters and the power divider can be achieved. The radius of the metallized through hole in the inner conductor of the quasi-coaxial connection structure 6 is 0.1 mm, and the radius of the external grounding post 7 is 0.4 mm.

[0037] As mentioned above, the size of the S-to-X band ultra-wideband filter power divider is 37.5 mm × 44.5 mm × 1 mm. The performance experiment of the module is carried out, such as Figure 4 As shown, the in-band standing wave of the entire filter power divider module is less than 1.5, the maximum insertion loss in the passband is 0.6 dB, the minimum is 0.2dB, and the in-band fluctuation is less than 0.4 dB. Figure 5 In the passband, the port isolation of the first output branch 2 and the second output branch 11 is greater than 15 dB, and the isolation is good.

[0038] In this embodiment, the filter and the power divider are integrated to form an S to X band ultra-wideband filter power divider module. By integrating multiple devices, namely the filter and the power divider, and realizing the isolation and matching of a single device inside the module, the external isolation circuit and matching circuit are reduced. At the same time, through the stacking design of multiple devices, the volume and loss of the entire RF device are reduced. Therefore, the design of the multi-device integrated module has also become an important means of realizing miniaturized RF front-end. Since the S to X band filter power divider module can adjust the performance of filtering and power division by changing the parameter values ​​of different circuits, the design is flexible and has good adjustability; it is easy to combine with other RF devices, and has a simple structure and low cost, and has good application potential in the millimeter wave frequency band.

[0039] It should be noted that due to its rich spectrum resources, the microwave frequency band is bound to be widely used and has broad prospects. However, the existing high-frequency band device manufacturing processes that are widely used, such as metal waveguide, LTCC process, etc., are difficult to process and require many factors to be considered during the design, resulting in high design and production costs. In this embodiment, a PCB board is used to design a filter power division module, which has the advantages of high integration, small size, wide bandwidth, high isolation, simple process, and low cost.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A harmonic detection dual-band ultra-wideband filter power divider, characterized in that: The invention comprises a first dielectric substrate (1), a second dielectric substrate (4) and a quasi-coaxial connection structure (6), wherein the first dielectric substrate (1) and the second dielectric substrate (4) form a square body, a second metal grounding layer (10) is arranged on the upper surface of the second dielectric substrate (4), and a first metal grounding layer (11) is arranged on the lower surfaces of the first dielectric substrate (1) and the second dielectric substrate (4), and the quasi-coaxial connection structure (6) comprises an inner conductor and an outer wall; the inner conductor is formed by a metallized through hole, and the outer wall is realized by adding a circle of external grounding posts (7) around the outer periphery of the inner conductor, and the external grounding posts (7) penetrate the second dielectric A substrate (4), an external grounding column (7) connecting two metal grounding layers; the upper surface of the first dielectric substrate is provided with a quarter-wavelength input branch, a quarter-wavelength microstrip branch transmission line (3), a second-order half-wavelength microstrip ladder resonant line located on the two branch lines, a quarter-wavelength microstrip parallel double line, a quarter-wavelength first output branch (2) and a second output branch (12), and a signal isolation resistor (5) connected across the two branch lines; and an isolation resistor (5) is provided between the first impedance converter (9) and the second impedance converter (8).

2. A harmonic detection dual-band ultra-wideband filter power divider according to claim 1, characterized in that: The branch line adopts two quarter-circumference arc structures, and second-order half-wavelength microstrip step resonant lines are etched on the branch line respectively. The second-order half-wavelength microstrip step resonant line and the output branch are connected by a quarter-wavelength microstrip parallel coupling double line.

3. A harmonic detection dual-band ultra-wideband filter power divider according to claim 2, characterized in that: The relative dielectric constant of the first dielectric substrate (1) is 2.2, and the loss tangent value is 0.0009.

4. The harmonic detection dual-band ultra-wideband filter power divider according to claim 3 is characterized in that: The structure of the first impedance converter (9) is composed of a plurality of microstrip line sections connected in cascade, and the first impedance converter (9) and the second impedance converter (8) have the same structure.

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