Plane sheet metal strip line quadruplexer

Abstract

The invention discloses a planar sheet metal strip line quadruplexer, and relates to the technical field of communication equipment, in the quadruplexer, an impedance matching network and four channel filters are arranged, two channel filters are respectively arranged at two sides of the impedance matching network, and the other two channel filters are inversely arranged at two sides of the top end of the impedance matching network; the impedance matching network and the four channel filters correspond to the five port connectors respectively, so that a multiplexer structure with one input and four outputs is realized; the impedance matching network comprises a common strip line resonator, each channel filter comprises four strip line resonators which are connected side by side, and tuning screws with the corresponding number are arranged at the same time and can be used for adjusting the resonant frequency of the corresponding strip line resonators. The common strip line resonator is respectively coupled with the first strip line resonator of each channel filter, impedance matching between the impedance matching network and each channel filter is realized, and the antenna has the advantages of planarization, high performance, easy integration and high reliability.

Description

Technical Field

[0001] The present application relates to the technical field of communication equipment, and in particular to a planar sheet metal strip line quadplexer. Background Art

[0002] The multiplexer is mainly composed of an impedance matching network (common tap structure) and several (N≥2) channel filters, which are designed to achieve simultaneous operation of multiple frequency bands, ensure high isolation between each channel frequency band, avoid mutual interference of signals, and thus ensure the stability of communication. Usually, a multiplexer used for frequency selection and certain isolation requirements of two frequency bands (channels) is called a duplexer, which is mainly composed of an impedance matching network and two channel filters; a triplexer is composed of an impedance matching network and three channel filters, which are used to support system operation of three frequency bands. A quadplexer, as the name implies, consists of four channel filters and an impedance matching network, which can support signal operation of four frequency bands at the same time. As the number of frequency bands (channels) supported by the multiplexer increases, its design difficulty also increases significantly.

[0003] At present, the quadplexer products that are widely used in the industry mainly include metal coaxial cavity quadplexer, microstrip quadplexer and dielectric waveguide quadplexer. Metal coaxial cavity quadplexer has the advantages of low loss, high power capacity and high reliability, but its product size is large, which is not conducive to use in miniaturized scenarios; microstrip quadplexer has various design forms, planarization and easy integration, but its own loss is large and its use is limited; dielectric waveguide quadplexer has good electrical performance and is easy to install, but its manufacturing process is complicated, the long-term reliability is average, and the porcelain body is prone to cracking. Therefore, in order to overcome the shortcomings of the existing technology, there is an urgent need for a multiplexer with a new structure to achieve the comprehensive advantages of planarization, easy integration, high performance and high reliability. Summary of the invention

[0004] The purpose of this application is to provide a planar sheet metal strip line quadrupole device with a novel structure and the comprehensive advantages of planarization, easy integration, high performance and high reliability.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] The present application provides a planar sheet metal strip line quadplexer, comprising: a bottom plate, a planar resonator frame and a cover plate; the bottom plate and the cover plate are respectively mounted on the bottom surface and the top surface of the planar resonator frame through positioning pins on the planar resonator frame, and are fixed by welding tin sealing; a first channel filter, a second channel filter, a third channel filter, a fourth channel filter and an impedance matching network are fixed in the planar resonator frame, the working frequency bands of the first channel filter, the second channel filter, the third channel filter and the fourth channel filter are arranged from low to high, the first channel filter and the second channel filter are respectively arranged on both sides of the impedance matching network, and the third channel filter and the fourth channel filter are invertedly arranged on both sides of the top of the impedance matching network; five port connectors are arranged on the cover plate, and the inner cores of the five port connectors pass through the cover plate and are respectively connected to the impedance matching network, the first channel filter, the second channel filter, the third channel filter and the fourth channel filter.

[0007] The impedance matching network includes a common stripline resonator, and the first channel filter, the second channel filter, the third channel filter and the fourth channel filter each include four stripline resonators connected in parallel. A plurality of tuning screws are provided on the cover plate at positions corresponding to the stripline resonators, and the tuning screws are used to adjust the resonance frequency of the corresponding stripline resonators. The common stripline resonator is respectively coupled with the first stripline resonator of the first channel filter, the first stripline resonator of the second channel filter, the first stripline resonator of the third channel filter and the first stripline resonator of the fourth channel filter, so as to realize impedance matching between the impedance matching network and the first channel filter, the second channel filter, the third channel filter and the fourth channel filter.

[0008] Optionally, the frequency-variant coupling between the first stripline resonator of the first channel filter and the second stripline resonator of the first channel filter, and the frequency-variant coupling between the third stripline resonator of the first channel filter and the fourth stripline resonator of the first channel filter respectively generate a transmission zero point outside the high-end band of the passband of the first channel filter.

[0009] The frequency-variant coupling between the first stripline resonator of the second channel filter and the second stripline resonator of the second channel filter produces a transmission zero outside the high-end band of the passband of the second channel filter, and the frequency-variant coupling between the third stripline resonator of the second channel filter and the fourth stripline resonator of the second channel filter produces a transmission zero outside the low-end band of the passband of the second channel filter.

[0010] The frequency-variant coupling between the first stripline resonator of the third channel filter and the second stripline resonator of the third channel filter produces a transmission zero point outside the low-end band of the passband of the third channel filter, and the frequency-variant coupling between the third stripline resonator of the third channel filter and the fourth stripline resonator of the third channel filter produces a transmission zero point outside the high-end band of the passband of the third channel filter.

[0011] The frequency-variant coupling between the first stripline resonator of the fourth channel filter and the second stripline resonator of the fourth channel filter, and the frequency-variant coupling between the third stripline resonator of the fourth channel filter and the fourth stripline resonator of the fourth channel filter respectively generate a transmission zero point outside the low-end band of the passband of the fourth channel filter.

[0012] Optionally, each stripline resonator of the first channel filter and each stripline resonator of the third channel filter are respectively fixed on the side walls of the planar resonator frame in a top-to-top position relationship, and each stripline resonator of the first channel filter is staggered with the corresponding stripline resonator in the third channel filter by a distance of half the width of the stripline resonator.

[0013] Each stripline resonator of the second channel filter and each stripline resonator of the fourth channel filter are respectively fixed on the side wall of the planar resonator frame in a top-to-top position relationship, and each stripline resonator of the second channel filter is staggered with the corresponding stripline resonator in the fourth channel filter by a distance of half the width of the stripline resonator.

[0014] The first channel filter is arranged on the left side of the common stripline resonator, and the left top end of the first stripline resonator of the third channel filter is arranged opposite to the left top end of the common stripline resonator; the second channel filter is arranged on the right side of the common stripline resonator, and the right top end of the first stripline resonator of the fourth channel filter is arranged opposite to the right top end of the common stripline resonator.

[0015] Optionally, the stripline resonator and the common stripline resonator are both stripline step impedance resonators; the electric field of the stripline step impedance resonator is concentrated in the upper half of the stripline step impedance resonator, and the magnetic field of the stripline step impedance resonator is concentrated in the lower half of the stripline step impedance resonator; the top of the first stripline resonator of the third channel filter is electrically coupled to the left top of the common stripline resonator, and the top of the first stripline resonator of the fourth channel filter is electrically coupled to the right top of the common stripline resonator.

[0016] Optionally, the first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator.

[0017] Optionally, the first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is electrically coupled to the common stripline resonator.

[0018] Optionally, the first stripline resonator of the first channel filter is electrically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator.

[0019] Optionally, the first stripline resonator of the first channel filter is electrically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is electrically coupled to the common stripline resonator.

[0020] Optionally, the magnetic coupling is that the lower parts of the two stripline resonators are connected by reinforcing ribs, and the distance between the reinforcing ribs and the side walls of the planar resonator frame connected to the bottom ends of the two stripline resonators is proportional to the magnetic coupling strength between the two stripline resonators.

[0021] Optionally, the electrical coupling is barrier-free isolation between the upper halves of the two stripline resonators, and the distance between the upper halves of the two stripline resonators is inversely proportional to the degree of electrical coupling between the two stripline resonators.

[0022] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0023] The present application provides a planar sheet metal strip line quadruplicater, in which a bottom plate and a cover plate are respectively fixed to the bottom and top surfaces of a planar resonator frame by welding tin sealing, an impedance matching network and a four-way channel filter are fixed in the planar resonator frame, the working frequency bands of the four-way channel filter are arranged from low to high, a first channel filter and a second channel filter are respectively arranged on both sides of the impedance matching network, and a third channel filter and a fourth channel filter are invertedly arranged on both sides of the top of the impedance matching network; the impedance matching network and the four-way channel filter correspond to five port connectors respectively, realizing one input and four outputs structure; the impedance matching network includes a common stripline resonator, and each of the four channel filters includes four stripline resonators connected in parallel, and a corresponding number of tuning screws are provided, which can be used to adjust the resonant frequency of the corresponding stripline resonator; the common stripline resonator is coupled with the first stripline resonator of each channel filter respectively, so as to realize the impedance matching between the impedance matching network and each channel filter; the planar sheet metal stripline quadplexer involved in the present application has a unique and compact structure, and can flexibly introduce a frequency-varying coupling structure between the resonators of the four-way channel filter to meet the requirements of the product electrical performance design. This design is easy to realize multiple transmission zeros, thereby achieving the effect of high out-of-band suppression and high isolation between channels. Compared with the quadplexer products currently on the market, the planar sheet metal stripline quadplexer of the present application shows the advantages of planarization, high performance, easy integration and high reliability. In addition, due to its compact structure, simple production and assembly, and easy debugging, it has a wide range of application potential in the field of wireless communications with extremely high requirements for electrical performance and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the external structure of a planar sheet metal strip line quadrupole provided in one embodiment of the present application.

[0026] Figure 2 A schematic diagram of the internal structure of a planar sheet metal strip line quadrupole device provided in one embodiment of the present application.

[0027] Figure 3 A schematic diagram of a frequency characteristic response curve of a planar sheet metal strip line quadplexer provided in one embodiment of the present application.

[0028] Figure 4 A partially enlarged schematic diagram of an impedance matching network of a planar sheet metal stripline quadplexer provided in one embodiment of the present application.

[0029] Figure 5 A schematic diagram of a group delay curve of an impedance matching network of a planar sheet metal strip line quadplexer provided in one embodiment of the present application.

[0030] Figure 6 A schematic structural diagram of the top surface of a planar sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0031] Figure 7 A schematic structural diagram of the bottom surface of a planar sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0032] Figure 8 A schematic diagram of the internal structure of a planar sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0033] Fig. 9 A schematic diagram of the internal structure of a planar sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0034] Fig.10 A schematic diagram of the internal structure of a planar sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0035] Reference numerals:

[0036] 100: common stripline resonator; 201: first stripline resonator of first channel filter; 202: second stripline resonator of first channel filter; 203: third stripline resonator of first channel filter; 204: fourth stripline resonator of first channel filter; 301: first stripline resonator of second channel filter; 302: second stripline resonator of second channel filter; 303: third stripline resonator of second channel filter; 304: fourth stripline resonator of second channel filter; 401: third stripline resonator of second channel filter; 401: the first stripline resonator of the fourth channel filter; 402: the second stripline resonator of the third channel filter; 403: the third stripline resonator of the third channel filter; 404: the fourth stripline resonator of the third channel filter; 501: the first stripline resonator of the fourth channel filter; 502: the second stripline resonator of the fourth channel filter; 503: the third stripline resonator of the fourth channel filter; 504: the fourth stripline resonator of the fourth channel filter; Port1: input port; Port2~Port5: output ports. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] The embodiment of the present application provides a planar sheet metal strip line quadrupole device, such as Figure 1 As shown, it includes: a bottom plate, a planar resonator frame and a cover plate; the bottom plate and the cover plate are respectively installed on the bottom surface and the top surface of the planar resonator frame through the positioning pins on the planar resonator frame, and are fixed by welding tin sealing; as an implementation method, the cover plate and the bottom plate are first pre-assembled with the frame through the positioning pins, and then the cover plate and the bottom plate are fixed to the upper surface and the lower surface of the frame by tin sealing welding. Further, as Figure 2 As shown, a first channel filter, a second channel filter, a third channel filter, a fourth channel filter and an impedance matching network are fixed in the planar resonator frame. The working frequency bands of the first channel filter, the second channel filter, the third channel filter and the fourth channel filter are arranged from low to high. The first channel filter and the second channel filter are respectively arranged on both sides of the impedance matching network, and the third channel filter and the fourth channel filter are inverted and arranged on both sides of the top of the impedance matching network; the four channel filters are connected to the planar resonator frame as a whole, and can be directly machined or wire-cut or stamped, with mature processing technology and low cost. Five port connectors are provided on the cover plate, and the inner cores of the five port connectors pass through the cover plate and are respectively connected to the impedance matching network, the first channel filter, the second channel filter, the third channel filter and the fourth channel filter. The planar sheet metal strip line quadruplexer product has few accessories, simple assembly process and convenient debugging.

[0040] As an implementation method, the cover, frame, bottom plate and other structural parts of the planar sheet metal strip line quadrupole can be processed with metal materials such as copper, aluminum, iron and stainless steel as the base material and then electroplated with silver; the cover, planar resonator frame and bottom plate and other structural parts can also be made of plastic materials, such as PEEK, POM, PPO and PET and other dielectric materials, which are injection molded and then electroplated with silver, so that the weight of the product can be reduced by more than 30%, achieving lightweight.

[0041] like Figure 2As shown, the impedance matching network includes a common stripline resonator 100, and the first channel filter, the second channel filter, the third channel filter and the fourth channel filter each include four stripline resonators connected in parallel, and each channel filter is arranged in a straight line. A transmission zero point is generated between the resonators by introducing a frequency-variable coupling structure, so as to improve the out-of-band suppression characteristics of the channel filter and enhance the isolation of each channel filter device. Figure 2 As shown, 201-204 are four resonators of the first channel filter, 301-304 are four resonators of the second channel filter, 401-404 are four resonators of the third channel filter, 501-504 are four resonators of the fourth channel filter, and a plurality of tuning screws are provided on the cover plate corresponding to the positions of the stripline resonators, and the tuning screws are used to adjust the resonant frequency of the corresponding stripline resonators; the planar sheet metal stripline quadplexer is a one-input four-output multiplexer, the input port Port1 is provided on the stripline resonator 100, and the four output ports Port2, Port3, Port4 and Port5 are provided on the stripline resonators 204, 304, 404 and 504 respectively; the input and output ports are all 50 ohm matched. The common stripline resonator is respectively coupled with the first stripline resonator of the first channel filter, the first stripline resonator of the second channel filter, the first stripline resonator of the third channel filter and the first stripline resonator of the fourth channel filter to achieve impedance matching between the impedance matching network and the first channel filter, the second channel filter, the third channel filter and the fourth channel filter.

[0042] When designing a product, the coupling polarity between the common stripline resonator 100 and the first stripline resonator 201, 301, 401 and 501 of each channel filter can be flexibly set as needed. The common stripline resonator 100 and the first stripline resonator of each channel filter can be magnetically coupled or electrically coupled.

[0043] As an optional embodiment, the frequency-variant coupling between the first stripline resonator of the first channel filter and the second stripline resonator of the first channel filter, and the frequency-variant coupling between the third stripline resonator of the first channel filter and the fourth stripline resonator of the first channel filter respectively generate a transmission zero point outside the high-end band of the passband of the first channel filter.

[0044] The frequency-variant coupling between the first stripline resonator of the second channel filter and the second stripline resonator of the second channel filter produces a transmission zero outside the high-end band of the passband of the second channel filter, and the frequency-variant coupling between the third stripline resonator of the second channel filter and the fourth stripline resonator of the second channel filter produces a transmission zero outside the low-end band of the passband of the second channel filter.

[0045] The frequency-variant coupling between the first stripline resonator of the third channel filter and the second stripline resonator of the third channel filter produces a transmission zero point outside the low-end band of the passband of the third channel filter, and the frequency-variant coupling between the third stripline resonator of the third channel filter and the fourth stripline resonator of the third channel filter produces a transmission zero point outside the high-end band of the passband of the third channel filter.

[0046] The frequency-variant coupling between the first stripline resonator of the fourth channel filter and the second stripline resonator of the fourth channel filter, and the frequency-variant coupling between the third stripline resonator of the fourth channel filter and the fourth stripline resonator of the fourth channel filter respectively generate a transmission zero point outside the low-end band of the passband of the fourth channel filter. The frequency characteristic response curve of the planar sheet metal stripline quadplexer is shown in FIG. Figure 3 As shown; S11 represents the reflection coefficient at port Port1; S21 represents the transmission coefficient from port Port2 to port Port1; S31 represents the transmission coefficient from port Port3 to port Port1; S41 represents the transmission coefficient from port Port4 to port Port1; S51 represents the transmission coefficient from port Port5 to port Port1.

[0047] As an exemplary embodiment, Figure 2 As shown, each stripline resonator of the first channel filter and each stripline resonator of the third channel filter are respectively fixed on the side walls of the planar resonator frame in a top-to-top position relationship, and each stripline resonator of the first channel filter is staggered with the corresponding stripline resonator in the third channel filter by a distance of half the width of the stripline resonator.

[0048] Each stripline resonator of the second channel filter and each stripline resonator of the fourth channel filter are respectively fixed on the side wall of the planar resonator frame in a top-to-top position relationship, and each stripline resonator of the second channel filter is staggered with the corresponding stripline resonator in the fourth channel filter by a distance of half the width of the stripline resonator.

[0049] The first channel filter is arranged on the left side of the common stripline resonator, and the left top end of the first stripline resonator of the third channel filter is arranged opposite to the left top end of the common stripline resonator; the second channel filter is arranged on the right side of the common stripline resonator, and the right top end of the first stripline resonator of the fourth channel filter is arranged opposite to the right top end of the common stripline resonator.

[0050] As an exemplary embodiment, the stripline resonator and the common stripline resonator are both stripline step impedance resonators; the electric field of the stripline step impedance resonator is concentrated in the upper half of the stripline step impedance resonator, and the magnetic field of the stripline step impedance resonator is concentrated in the lower half of the stripline step impedance resonator. The top of the first stripline resonator of the third channel filter is electrically coupled to the left top of the common stripline resonator, and the top of the first stripline resonator of the fourth channel filter is electrically coupled to the right top of the common stripline resonator. The electrical coupling is an unobstructed isolation between the upper halves of the two stripline resonators, such as Figure 4 As shown, the distance (d1 or d2) between the upper parts of the two stripline resonators is inversely proportional to the degree of electrical coupling between the two stripline resonators, that is, the smaller d1 or d2 is, the greater the corresponding electrical coupling is.

[0051] The first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator. The magnetic coupling is that the lower halves of the two stripline resonators are connected by reinforcing ribs, such as Figure 4 As shown, the distance (h1 or h2) between the reinforcing rib and the side wall of the planar resonator frame connected to the bottom ends of the two stripline resonators is proportional to the magnetic coupling strength between the two stripline resonators, that is, the larger h1 or h2 is, the stronger the corresponding magnetic coupling is.

[0052] The impedance matching network design of the planar sheet metal stripline quadplexer is ingenious and flexible, and can easily achieve impedance matching and coupling control between the stripline resonator 100 and the four-way channel filter. The corresponding group delay curve is shown in Figure 5 As shown, Figure 5 The four bumps in the figure represent the coupling strength relationship between the common stripline resonator 100 and the four channel filters. Each bump corresponds to the delay peak at the center frequency of each channel filter. The stronger the coupling, the lower the delay peak. GD(1,1) represents the group delay at input port 1; the weaker the coupling, the weaker the delay peak. By adjusting h1, h2, d1 and d2, the strength of the corresponding coupling structure can be controlled, that is, the height of the corresponding delay peak can be controlled.

[0053] In another exemplary embodiment of the present application, the input and output ports of the planar sheet metal strip line quadplexer can use either a traditional port connector or a probe-to-plug connection method. In this case, the probes of the input and output ports are on the bottom plate, which makes it easy to integrate and install with other planar circuits of the system. The thickness of the product can be further reduced to achieve the purpose of miniaturization and planarization, such as Figure 6-Figure 7 shown.

[0054] In addition, in addition to the above coupling methods, other coupling methods can be used between the four-way channel filter and the impedance matching network. In another exemplary embodiment of the present application, Figure 8 As shown, the first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is electrically coupled to the common stripline resonator. The coupling between the common stripline resonator 100 and the first stripline resonator 201 of the first channel filter in the impedance matching network is magnetic coupling; the coupling between the common stripline resonator 100 and the first stripline resonator 301 of the second channel filter is electrical coupling.

[0055] In another exemplary embodiment of the present application, Fig. 9 As shown, the first stripline resonator of the first channel filter is electrically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator. The coupling between the common stripline resonator 100 and the first stripline resonator 201 of the first channel filter in the impedance matching network is electrical coupling; the coupling between the common stripline resonator 100 and the first stripline resonator 301 of the second channel filter is magnetic coupling.

[0056] In another exemplary embodiment of the present application, Fig.10 As shown, the first stripline resonator of the first channel filter is electrically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is electrically coupled to the common stripline resonator. The coupling between the common stripline resonator 100 and the first stripline resonator 201 of the first channel filter in the impedance matching network is electrical coupling; the coupling between the common stripline resonator 100 and the first stripline resonator 301 of the second channel filter is electrical coupling.

[0057] The above-mentioned planar sheet metal stripline quadplexer proposed in the present application mainly includes a novel impedance matching network and a channel filter composed of four stripline resonators. The planar sheet metal quadplexer is a planar structure with a thin product thickness. Each of its channel filters is arranged in a linear manner, and a frequency-variable coupling structure can be easily introduced into the resonator of each channel filter to generate a transmission zero point, thereby improving the out-of-band suppression of the channel filter and the isolation between each channel filter. The coupling between the common stripline resonator and the first resonator of each channel filter can be either electrical coupling or magnetic coupling. The structure is novel and compact, the coupling is flexible and rich, and the coupling polarity and strength can also be flexibly controlled. In addition, the types of materials used in the quadruplexer are simple, the processing technology is mature, the assembly process is few, and the production consistency is good. Its power capacity is comparable to that of a small metal coaxial cavity quadruplexer, the single-cavity Q value is high, the insertion loss is small (larger than the dielectric waveguide resonator and slightly smaller than the metal coaxial resonator), and its harmonic suppression characteristics are good. This type of planar sheet metal stripline quadruplexer has few material structures and is easy to assemble. The resonator frame and the cover and bottom plates are all fixed together by soldering. It has high reliability and good intermodulation characteristics. It has broad application potential in the field of wireless communications that have extremely high requirements for electrical performance and miniaturization.

[0058] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A planar sheet metal strip line quadrupole device, characterized in that: include: A bottom plate, a planar resonator frame and a cover plate; the bottom plate and the cover plate are respectively mounted on the bottom surface and the top surface of the planar resonator frame through the positioning pins on the planar resonator frame, and are fixed by welding tin sealing; a first channel filter, a second channel filter, a third channel filter, a fourth channel filter and an impedance matching network are fixed in the planar resonator frame, the working frequency bands of the first channel filter, the second channel filter, the third channel filter and the fourth channel filter are arranged from low to high, the first channel filter and the second channel filter are respectively arranged on both sides of the impedance matching network, and the third channel filter and the fourth channel filter are invertedly arranged on both sides of the top of the impedance matching network; five port connectors are arranged on the cover plate, the inner cores of the five port connectors pass through the cover plate, and are respectively connected to the impedance matching network, the first channel filter, the second channel filter, the third channel filter and the fourth channel filter; The impedance matching network includes a common stripline resonator, the first channel filter, the second channel filter, the third channel filter and the fourth channel filter each include four stripline resonators connected in parallel, and a plurality of tuning screws are provided on the cover plate at positions corresponding to the stripline resonators, and the tuning screws are used to adjust the resonance frequency of the corresponding stripline resonators; the common stripline resonator is respectively coupled with the first stripline resonator of the first channel filter, the first stripline resonator of the second channel filter, the first stripline resonator of the third channel filter and the first stripline resonator of the fourth channel filter, so as to realize impedance matching between the impedance matching network and the first channel filter, the second channel filter, the third channel filter and the fourth channel filter.

2. The planar sheet metal strip line quadrupole device according to claim 1, characterized in that: The frequency-variant coupling between the first stripline resonator of the first channel filter and the second stripline resonator of the first channel filter, and the frequency-variant coupling between the third stripline resonator of the first channel filter and the fourth stripline resonator of the first channel filter respectively generate a transmission zero outside the high-end band of the passband of the first channel filter; The frequency-variant coupling between the first stripline resonator of the second channel filter and the second stripline resonator of the second channel filter generates a transmission zero outside the high-end band of the passband of the second channel filter, and the frequency-variant coupling between the third stripline resonator of the second channel filter and the fourth stripline resonator of the second channel filter generates a transmission zero outside the low-end band of the passband of the second channel filter; The frequency-variant coupling between the first stripline resonator of the third channel filter and the second stripline resonator of the third channel filter generates a transmission zero outside the low-end band of the passband of the third channel filter, and the frequency-variant coupling between the third stripline resonator of the third channel filter and the fourth stripline resonator of the third channel filter generates a transmission zero outside the high-end band of the passband of the third channel filter; The frequency-variant coupling between the first stripline resonator of the fourth channel filter and the second stripline resonator of the fourth channel filter, and the frequency-variant coupling between the third stripline resonator of the fourth channel filter and the fourth stripline resonator of the fourth channel filter respectively generate a transmission zero point outside the low-end band of the passband of the fourth channel filter.

3. The planar sheet metal strip line quadrupole device according to claim 1, characterized in that: Each stripline resonator of the first channel filter and each stripline resonator of the third channel filter are respectively fixed on the side wall of the planar resonator frame in a top-to-top position relationship, and each stripline resonator of the first channel filter is staggered with a distance of half the width of the stripline resonator from the corresponding stripline resonator in the third channel filter; Each stripline resonator of the second channel filter and each stripline resonator of the fourth channel filter are respectively fixed on the side wall of the planar resonator frame in a top-to-top position relationship, and each stripline resonator of the second channel filter is staggered with a distance of half the width of the stripline resonator from the corresponding stripline resonator in the fourth channel filter; The first channel filter is arranged on the left side of the common stripline resonator, and the left top end of the first stripline resonator of the third channel filter is arranged opposite to the left top end of the common stripline resonator; the second channel filter is arranged on the right side of the common stripline resonator, and the right top end of the first stripline resonator of the fourth channel filter is arranged opposite to the right top end of the common stripline resonator.

4. The planar sheet metal strip line quadruplicater according to claim 3, characterized in that: The stripline resonator and the common stripline resonator are both stripline step impedance resonators; the electric field of the stripline step impedance resonator is concentrated in the upper half of the stripline step impedance resonator, and the magnetic field of the stripline step impedance resonator is concentrated in the lower half of the stripline step impedance resonator; The top of the first stripline resonator of the third channel filter is electrically coupled to the left top of the common stripline resonator, and the top of the first stripline resonator of the fourth channel filter is electrically coupled to the right top of the common stripline resonator.

5. The planar sheet metal strip line quadrupole device according to claim 4, characterized in that: The first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator.

6. The planar sheet metal strip line quadruplicater according to claim 4, characterized in that: The first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is electrically coupled to the common stripline resonator.

7. The planar sheet metal strip line quadruplicater according to claim 4, characterized in that: The first stripline resonator of the first channel filter is electrically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator.

8. The planar sheet metal strip line quadruplicater according to claim 4, characterized in that: The first stripline resonator of the first channel filter is electrically coupled to the common stripline resonator, and the first stripline resonator of the second channel filter is electrically coupled to the common stripline resonator.

9. The planar sheet metal strip line quadrupole device according to any one of claims 5 to 7, characterized in that: The magnetic coupling is that the lower parts of the two stripline resonators are connected by reinforcing ribs, and the distance between the reinforcing ribs and the side walls of the planar resonator frame connected to the bottom ends of the two stripline resonators is proportional to the magnetic coupling strength between the two stripline resonators.

10. The planar sheet metal strip line quadrupole device according to any one of claims 4 to 8, characterized in that: The electrical coupling is barrier-free isolation between the upper halves of the two stripline resonators, and the distance between the upper halves of the two stripline resonators is inversely proportional to the degree of electrical coupling between the two stripline resonators.

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