Miniaturized sheet metal strip line quadruplexer

Abstract

The invention discloses a miniaturized 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 parallel to the previous two channel filters. The impedance matching networks are arranged side by side behind the impedance matching networks. The impedance matching network and the four-channel filter correspond to five port connectors, 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 connected side by side, the common strip line resonator is coupled with the first strip line resonator of each channel filter, and impedance matching between the impedance matching network and each channel filter is achieved. Compared with the prior art, the miniaturized sheet metal strip line quadruplexer provided by the invention has the advantages of miniaturization, easiness in integration, high performance and high reliability.

Description

Technical Field

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

[0002] The multiplexer is composed of a group of non-superimposed filters, that is, it is composed of multiple channel filters. The channel filters are not loaded on each other, and there is a high degree of isolation between the channel filters. The multiplexer is mainly composed of an impedance matching network (common tap structure) and a number of (N≥2) channel filters. When multiple frequency bands work simultaneously, it ensures high isolation between the channel frequency bands to avoid mutual interference of signals, thereby ensuring the stability of communication. A quadplexer, as the name implies, combines four channel filters and shares a node (also called a common tap structure or impedance matching network). The complexity of a quadplexer is much higher than that of a duplexer and a triplexer because its four channel filters must be designed together and meet strict cross-isolation specifications.

[0003] The common and widely used quadrupoles in the industry mainly include coaxial cavity quadrupoles, metal waveguide quadrupoles, microstrip quadrupoles and dielectric waveguide quadrupoles. Coaxial cavity quadrupoles and metal waveguide quadrupoles have the advantages of low loss, high power capacity and high reliability, but their product size and weight are large, and their miniaturization and lightweight use scenarios are limited; microstrip quadrupoles have the advantages of planarization and easy integration, but their own losses are very large and cannot be used in scenarios with high loss requirements such as RF front-ends; dielectric waveguide quadrupoles have a large porcelain body, and the dry pressing process requires a large-tonnage press. The green body is also prone to warping after sintering, and the porcelain body is prone to cracking, and the long-term reliability is average.

[0004] Therefore, in order to overcome the shortcomings of the existing technology, a multiplexer with a new structure is urgently needed to achieve the comprehensive advantages of miniaturization, easy integration, high performance and high reliability. Summary of the invention

[0005] The purpose of this application is to provide a miniaturized sheet metal strip line quadrupole device with a novel structure and the comprehensive advantages of miniaturization, easy integration, high performance and high reliability.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In the first aspect, the present application provides a miniaturized sheet metal strip line quadplexer, comprising: a base plate, a resonator frame and a cover plate; the base plate and the cover plate are respectively mounted on the bottom and top surfaces of the resonator frame through positioning pins on the 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 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 arranged side by side on the rear side of the impedance matching network, and the third channel filter and the fourth channel filter are respectively arranged on both sides of the impedance matching network; five port connectors are provided on the resonator frame, and the inner cores of the five port connectors pass through the base 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.

[0008] 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. The bottom of each stripline resonator is fixedly welded on the bottom plate, and a plurality of tuning screws are arranged on the cover plate at positions corresponding to each stripline resonator. The tuning screws are used to adjust the resonance frequency of the corresponding stripline resonator. 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.

[0009] Optionally, the frequency-variant coupling between the second stripline resonator of the first channel filter and the third stripline resonator of the first channel filter generates a transmission zero outside the upper band of the passband of the first channel filter.

[0010] The frequency-variant coupling between the second stripline resonator of the second channel filter and the third stripline resonator of the second channel filter generates a transmission zero outside the upper band of the passband of the second channel filter.

[0011] The frequency-variant coupling between the second stripline resonator of the third channel filter and the third stripline resonator of the third channel filter generates a transmission zero outside the lower end band of the passband of the third channel filter.

[0012] The frequency-variant coupling between the second stripline resonator of the fourth channel filter and the third stripline resonator of the fourth channel filter generates a transmission zero point outside the lower end band of the passband of the fourth channel filter.

[0013] Optionally, each stripline resonator of the first channel filter and each stripline resonator of the third channel filter are arranged in parallel, and each stripline resonator of the first channel filter is staggered with a corresponding stripline resonator in the third channel filter by a distance of half the width of the stripline resonator.

[0014] Each stripline resonator of the second channel filter and each stripline resonator of the fourth channel filter are arranged in parallel, 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.

[0015] The third channel filter is arranged on the left side of the common stripline resonator, and the right branch of the first stripline resonator of the first channel filter is arranged opposite to the left branch of the common stripline resonator; the fourth channel filter is arranged on the right side of the common stripline resonator, and the left branch of the first stripline resonator of the second channel filter is arranged opposite to the right branch of the common stripline resonator.

[0016] 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.

[0017] Optionally, the right side branch of the first stripline resonator of the first channel filter is electrically coupled to the left side branch of the common stripline resonator, and the left side branch of the first stripline resonator of the second channel filter is electrically coupled to the right side branch of the common stripline resonator; the first stripline resonator of the third channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the fourth channel filter is magnetically coupled to the common stripline resonator.

[0018] Optionally, the right side branch of the first stripline resonator of the first channel filter is electrically coupled to the left side branch of the common stripline resonator, and the left side branch of the first stripline resonator of the second channel filter is electrically coupled to the right side branch of the common stripline resonator; the right side branch of the first stripline resonator of the third channel filter is electrically coupled to the left side branch of the common stripline resonator, and the first stripline resonator of the fourth channel filter is magnetically coupled to the common stripline resonator.

[0019] Optionally, the right side branch of the first stripline resonator of the first channel filter is electrically coupled to the left side branch of the common stripline resonator, and the left side branch of the first stripline resonator of the second channel filter is electrically coupled to the right side branch of the common stripline resonator; the right side branch of the first stripline resonator of the third channel filter is electrically coupled to the left side branch of the common stripline resonator, and the left side branch of the first stripline resonator of the fourth channel filter is electrically coupled to the right side branch of the common stripline resonator.

[0020] Optionally, the first stripline resonator of the first channel filter is magnetically coupled to the common stripline resonator, the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator, the first stripline resonator of the third channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the fourth channel filter is magnetically coupled to the common stripline resonator.

[0021] 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 bottom plate is proportional to the magnetic coupling strength between the two stripline resonators.

[0022] Optionally, the electrical coupling is barrier-free isolation between the branches of the upper halves of the two stripline resonators; and the distance between the branches of the upper halves of the two stripline resonators is inversely proportional to the degree of electrical coupling between the two stripline resonators.

[0023] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0024] The present application provides a miniaturized sheet metal stripline quadplexer, in which a bottom plate and a cover plate are respectively fixed to the bottom and top surfaces of a resonator frame by welding tin sealing, an impedance matching network and a four-way channel filter are fixed in the resonator frame, the working frequency bands of the four-way channel filter are arranged from low to high, the bottom ends of the four-way channel filters are fixedly mounted on the bottom plate, a first channel filter and a second channel filter are arranged side by side on the rear side of the impedance matching network, and a third channel filter and a fourth channel filter are respectively arranged on both sides of the impedance matching network; the impedance matching network and the four-way channel filter correspond to five port connectors respectively, realizing a one-input four-output structure; the impedance matching network includes a common stripline resonator, and the four-way channel filter each includes four stripline resonators connected side by side, 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 respectively coupled with the first stripline resonator of each channel filter, so as to realize impedance matching between the impedance matching network and each channel filter. The miniaturized sheet metal stripline quadplexer involved in this 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 needs of the product's electrical performance design. This design is easy to achieve multiple transmission zeros, thereby achieving high out-of-band suppression and high channel isolation. Compared with the quadplexer products currently on the market, the miniaturized sheet metal stripline quadplexer of this application demonstrates the advantages of miniaturization, high performance, easy integration and high reliability. In addition, due to its compact structure, simple production and assembly, and easy debugging, it has broad application potential in the field of wireless communications that have extremely high requirements for electrical performance and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 A schematic diagram of the external structure of a miniaturized sheet metal strip line quadrupole provided in one embodiment of the present application.

[0027] Figure 2 A schematic diagram of an exploded structure of a miniaturized sheet metal strip line quadrupole provided in one embodiment of the present application.

[0028] Figure 3 A schematic diagram of the internal structure of a miniaturized sheet metal strip line quadrupole device provided in one embodiment of the present application.

[0029] Figure 4A partially enlarged schematic diagram of an impedance matching network of a miniaturized sheet metal strip line quadplexer provided in one embodiment of the present application.

[0030] Figure 5 A schematic diagram of a frequency characteristic response curve of a miniaturized sheet metal strip line quadplexer provided in one embodiment of the present application.

[0031] Figure 6 A schematic diagram of the electric field distribution of a stripline stepped impedance resonator of a miniaturized sheet metal stripline quadrupole provided in another embodiment of the present application.

[0032] Figure 7 A schematic diagram of a group delay curve of an impedance matching network of a miniaturized sheet metal strip line quadplexer provided in one embodiment of the present application.

[0033] Figure 8 A schematic diagram of the external structure of a miniaturized sheet metal strip line quadrupole provided in another embodiment of the present application.

[0034] Fig. 9 A schematic diagram of the internal structure of a miniaturized sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0035] Fig.10 A schematic diagram of the internal structure of a miniaturized sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0036] Fig.11 A schematic diagram of the internal structure of a miniaturized sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0037] Fig.12 A schematic diagram of the internal structure of a miniaturized sheet metal strip line quadrupole device provided in another embodiment of the present application.

[0038] Reference numerals:

[0039] 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

[0040] 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.

[0041] With the rapid development of wireless communication technology, the demand for efficient spectrum and high-speed data transmission in communication systems has become increasingly urgent, leading to the continuous emergence of multi-frequency integrated miniaturized communication devices. In order to maximize the utilization of spectrum resources and reduce interference, multiplexing communication technology is essential. The so-called multiplexing communication allows communication equipment to transmit and receive signals simultaneously on two or more frequency bands at the same time. In this process, the multiplexer plays a key role. It can merge multiple signals into a single channel and provide an unobstructed path for the transmission of data signals. Duplexers, triplexers and quadplexers all belong to the category of multiplexers, which usually have one input port and multiple output ports.

[0042] The multiplexer consists of a set of non-superimposed filters, that is, it consists of multiple channel filters. These channel filters do not interfere with each other and have high isolation. The multiplexer is mainly composed of an impedance matching network (common tap structure) and several (N≥2) channel filters to ensure that when multiple frequency bands work simultaneously, the channels maintain high isolation and avoid mutual interference of signals, thereby ensuring the stability of communication. The quadplexer combines four channel filters and shares a node (also called a common tap structure or matching network). Compared with duplexers and triplexers, the design of quadplexers is more complicated because its four channel filters must be designed together and meet strict cross-isolation specifications.

[0043] In the industry, common types of quadruples include coaxial cavity quadruples, metal waveguide quadruples, microstrip quadruples, and dielectric waveguide quadruples. Metal cavity quadruples are known for their low loss, high power capacity, and high reliability, but their large size and weight limit their application in miniaturization and lightweight scenarios; microstrip quadruples have the advantages of planarization and easy integration, but their own losses are large and they are not suitable for scenarios such as RF front-ends that have high loss requirements; dielectric waveguide quadruples require a large-tonnage press during the dry pressing process due to their large porcelain body size, and the sintered green body is prone to warping and the porcelain body is prone to cracking, so their long-term reliability is average.

[0044] To this end, the present application innovatively develops a compact and miniaturized sheet metal stripline quadruplicater, which has high performance and reliability second only to that of a metal coaxial cavity quadruplicater, while also having the advantages of miniaturization and easy integration of a dielectric waveguide quadruplicater.

[0045] 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.

[0046] In an exemplary embodiment, Figure 1 As shown, a miniaturized sheet metal strip line quadplexer is provided, comprising: a base plate, a resonator frame and a cover plate; the base plate and the cover plate are respectively mounted on the bottom and top surfaces of the resonator frame through positioning pins on the resonator frame, and fixed by welding tin sealing; as an implementation method, the cover plate and the base plate are first pre-assembled with the frame through positioning pins, and then the cover plate and the base plate are fixed to the upper and lower surfaces of the frame by tin sealing welding. Further, as Figure 2The exploded schematic diagram of the structure shown in the figure shows that the first channel filter, the second channel filter, the third channel filter, the fourth channel filter and the impedance matching network are fixed in the 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 arranged side by side on the rear side of the impedance matching network, and the third channel filter and the fourth channel filter are arranged on both sides of the impedance matching network respectively. Each channel filter can be processed by wire cutting or stamping, and each channel filter is installed in the corresponding position of the bottom plate through the tooling and fixed by laser welding. Five port connectors are provided on the resonator frame, and the inner cores of the five port connectors pass through the bottom 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. Several tuning screws are provided on the cover plate corresponding to the position of each stripline resonator, and the tuning screws are used to adjust the resonant frequency of the corresponding stripline resonator. The miniaturized sheet metal stripline quadruplexer product has few accessories, simple assembly process and convenient debugging.

[0047] As an implementation method, the cover, frame, bottom plate and other structural parts of the miniaturized 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, 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.

[0048] 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, thereby improving the out-of-band suppression characteristics of the channel filter and enhancing the isolation of each channel filter device. Figure 3 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, the bottom of each stripline resonator is fixedly welded on the bottom plate, and the bottom plate is provided with mounting welding holes; the miniaturized sheet metal stripline quadplexer is a one-input four-output multiplexer, the input port Port1 is arranged on the stripline resonator 100, and the four output ports Port2, Port3, Port4 and Port5 are arranged on the stripline resonators 204, 304, 404 and 504 respectively; the input and output ports are all 50 ohm matched. Figure 4As shown in the local enlarged view, the common stripline resonator 100 is respectively coupled with the first stripline resonator 201 of the first channel filter, the first stripline resonator 301 of the second channel filter, the first stripline resonator 401 of the third channel filter and the first stripline resonator 501 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.

[0049] As an optional embodiment, the frequency-variant coupling between the second stripline resonator 202 of the first channel filter and the third stripline resonator 203 of the first channel filter generates a transmission zero outside the high-end band of the passband of the first channel filter. The frequency-variant coupling between the second stripline resonator 302 of the second channel filter and the third stripline resonator 303 of the second channel filter generates a transmission zero outside the high-end band of the passband of the second channel filter. The frequency-variant coupling between the second stripline resonator 402 of the third channel filter and the third stripline resonator 403 of the third channel filter generates a transmission zero outside the low-end band of the passband of the third channel filter. The frequency-variant coupling between the second stripline resonator 502 of the fourth channel filter and the third stripline resonator 503 of the fourth channel filter generates a transmission zero outside the low-end band of the passband of the fourth channel filter. The frequency characteristic response curve of the miniaturized sheet metal stripline quadplexer is shown as follows: Figure 5 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.

[0050] As an exemplary embodiment, Figure 3 As shown, each stripline resonator of the first channel filter and each stripline resonator of the third channel filter are arranged in parallel, 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.

[0051] Each stripline resonator of the second channel filter and each stripline resonator of the fourth channel filter are arranged in parallel, 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.

[0052] The third channel filter is arranged on the left side of the common stripline resonator 100, and the right branch of the first stripline resonator 201 of the first channel filter is arranged opposite to the left branch of the common stripline resonator 100; the fourth channel filter is arranged on the right side of the common stripline resonator 100, and the left branch of the first stripline resonator 301 of the second channel filter is arranged opposite to the right branch of the common stripline resonator 100.

[0053] As an exemplary embodiment, the stripline resonators in each channel filter and the common stripline resonator 100 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. Figure 6 As shown in the figure, the electric field distribution diagrams of the two SIR stripline resonators are shown. From the field distribution diagram, it can be seen that the electric field distributions of the two resonators are similar, and the electric field layout is concentrated in the upper part of the stripline, and the electric field is strong.

[0054] 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.

[0055] In one embodiment of the present application, the right side branch of the first stripline resonator 201 of the first channel filter is electrically coupled to the left side branch of the common stripline resonator 100, and the left side branch of the first stripline resonator 301 of the second channel filter is electrically coupled to the right side branch of the common stripline resonator 100; the electrical coupling is an unobstructed isolation between the branches of the upper halves of the two stripline resonators; the distance between the branches of the upper halves of the two stripline resonators is inversely proportional to the degree of electrical coupling between the two stripline resonators.

[0056] The first stripline resonator 401 of the third channel filter is magnetically coupled to the common stripline resonator 100, and the first stripline resonator 501 of the fourth channel filter is magnetically coupled to the common stripline resonator 100. The magnetic coupling is that the lower halves of the two stripline resonators are connected by reinforcing ribs; the distance between the reinforcing ribs and the bottom plate is proportional to the magnetic coupling strength between the two stripline resonators.

[0057] The impedance matching network design of the miniaturized 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 7 As shown, Figure 7The four protrusions in the figure represent the coupling strength relationship between the common stripline resonator 100 and the four channel filters. Each protrusion 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 the input port Port1; the weaker the coupling, the weaker the delay peak. By adjusting the distance between each reinforcing rib and the bottom plate, as well as the distance between the branches, the strength of the corresponding coupling structure can be controlled, that is, the height of the corresponding delay peak can be controlled.

[0058] In another exemplary embodiment of the present application, the appearance structure of the miniaturized sheet metal strip line quadrupole can be expanded according to the installation application scenario of the product, and its input and output port connectors can adopt a probe-to-plug connection method (in this case, the probes of the input and output ports are on the bottom plate), which is easy to integrate with other circuits and install together, or a traditional coaxial connector (the coaxial connector is installed on the resonator frame) can be used for external connection, such as Figure 8 shown.

[0059] 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, Fig. 9 As shown, the right side branch of the first stripline resonator 201 of the first channel filter is electrically coupled to the left side branch of the common stripline resonator 100, the left side branch of the first stripline resonator 301 of the second channel filter is electrically coupled to the right side branch of the common stripline resonator 100; the right side branch of the first stripline resonator 401 of the third channel filter is electrically coupled to the left side branch of the common stripline resonator 100, and the first stripline resonator 501 of the fourth channel filter is magnetically coupled to the common stripline resonator 100.

[0060] In another exemplary embodiment of the present application, Fig.10 As shown, the right side branch of the first stripline resonator 201 of the first channel filter is electrically coupled to the left side branch of the common stripline resonator 100, and the left side branch of the first stripline resonator 301 of the second channel filter is electrically coupled to the right side branch of the common stripline resonator 100; the right side branch of the first stripline resonator 401 of the third channel filter is electrically coupled to the left side branch of the common stripline resonator 100, and the left side branch of the first stripline resonator 501 of the fourth channel filter is electrically coupled to the right side branch of the common stripline resonator 100.

[0061] In another exemplary embodiment of the present application, Fig.11As shown, the right branch of the first stripline resonator 201 of the first channel filter is electrically coupled to the left branch of the common stripline resonator 100, the first stripline resonator 301 of the second channel filter is magnetically coupled to the common stripline resonator 100, the first stripline resonator 401 of the third channel filter is magnetically coupled to the common stripline resonator 100, and the first stripline resonator 501 of the fourth channel filter is magnetically coupled to the common stripline resonator 100.

[0062] In another exemplary embodiment of the present application, Fig.12 As shown, the first stripline resonator 201 of the first channel filter is magnetically coupled to the common stripline resonator 100, the first stripline resonator 301 of the second channel filter is magnetically coupled to the common stripline resonator 100, the first stripline resonator 401 of the third channel filter is magnetically coupled to the common stripline resonator 100, and the first stripline resonator 501 of the fourth channel filter is magnetically coupled to the common stripline resonator 100.

[0063] The miniaturized 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 small sheet metal quadplexer has a novel and compact structure and a small product size. Each of its channel filters is arranged in a linear manner. The 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 material cost used in the quadruplexer is low, 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 miniaturized sheet metal stripline quadruplexer has few material structures and is easy to assemble. The resonator frame and the cover and bottom plates are fixed together by brush soldering, and the resonator metal sheet and the bottom plate are fixed by laser welding. The product has high reliability and good intermodulation characteristics, and has broad application potential in the field of wireless communications that have extremely high requirements for electrical performance and miniaturization.

[0064] 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.

[0065] 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 miniaturized sheet metal strip line quadrupole device, characterized in that: include: A bottom plate, a 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 resonator frame through the positioning pins on the 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 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 arranged side by side on the rear side of the impedance matching network, and the third channel filter and the fourth channel filter are respectively arranged on both sides of the impedance matching network; five port connectors are arranged on the resonator frame, the inner cores of the five port connectors pass through the bottom 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, the bottom of each stripline resonator is fixedly welded on the bottom plate, and a plurality of tuning screws are provided on the cover plate at positions corresponding to each stripline resonator, and the tuning screws are used to adjust the resonance frequency of the corresponding stripline resonator; 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 miniaturized sheet metal strip line quadrupole device according to claim 1, characterized in that: The frequency-variant coupling between the second stripline resonator of the first channel filter and the third stripline resonator of the first channel filter generates a transmission zero outside the high-end band of the passband of the first channel filter; The frequency-variant coupling between the second stripline resonator of the second channel filter and the third stripline resonator of the second channel filter generates a transmission zero outside the high-end band of the passband of the second channel filter; The frequency-variant coupling between the second stripline resonator of the third channel filter and the third stripline resonator of the third channel filter generates a transmission zero outside the low-end band of the passband of the third channel filter; The frequency-variant coupling between the second stripline resonator of the fourth channel filter and the third stripline resonator of the fourth channel filter generates a transmission zero outside the low-end band of the passband of the fourth channel filter.

3. The miniaturized 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 arranged in parallel, and each stripline resonator of the first channel filter is staggered with a distance of half the width of the stripline resonator from a 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 arranged in parallel, and each stripline resonator of the second channel filter is staggered with a distance of half the width of the stripline resonator from a corresponding stripline resonator in the fourth channel filter; The third channel filter is arranged on the left side of the common stripline resonator, and the right side branch of the first stripline resonator of the first channel filter is arranged opposite to the left side branch of the common stripline resonator; the fourth channel filter is arranged on the right side of the common stripline resonator, and the left side branch of the first stripline resonator of the second channel filter is arranged opposite to the right side branch of the common stripline resonator.

4. The miniaturized sheet metal strip line quadrupole device 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.

5. The miniaturized sheet metal strip line quadrupole device according to claim 4, characterized in that: The right branch of the first stripline resonator of the first channel filter is electrically coupled to the left branch of the common stripline resonator, and the left branch of the first stripline resonator of the second channel filter is electrically coupled to the right branch of the common stripline resonator; The first stripline resonator of the third channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the fourth channel filter is magnetically coupled to the common stripline resonator.

6. The miniaturized sheet metal strip line quadrupole device according to claim 4, characterized in that: The right branch of the first stripline resonator of the first channel filter is electrically coupled to the left branch of the common stripline resonator, and the left branch of the first stripline resonator of the second channel filter is electrically coupled to the right branch of the common stripline resonator; The right branch of the first stripline resonator of the third channel filter is electrically coupled to the left branch of the common stripline resonator, and the first stripline resonator of the fourth channel filter is magnetically coupled to the common stripline resonator.

7. The miniaturized sheet metal strip line quadrupole device according to claim 4, characterized in that: The right branch of the first stripline resonator of the first channel filter is electrically coupled to the left branch of the common stripline resonator, and the left branch of the first stripline resonator of the second channel filter is electrically coupled to the right branch of the common stripline resonator; The right side branch of the first stripline resonator of the third channel filter is electrically coupled to the left side branch of the common stripline resonator, and the left side branch of the first stripline resonator of the fourth channel filter is electrically coupled to the right side branch of the common stripline resonator.

8. The miniaturized 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, the first stripline resonator of the second channel filter is magnetically coupled to the common stripline resonator, the first stripline resonator of the third channel filter is magnetically coupled to the common stripline resonator, and the first stripline resonator of the fourth channel filter is magnetically coupled to the common stripline resonator.

9. The miniaturized sheet metal strip line quadrupole device according to claims 5-6 and 8, characterized in that: The magnetic coupling is that the lower parts of the two strip line resonators are connected by reinforcing ribs; the distance between the reinforcing ribs and the bottom plate is proportional to the magnetic coupling strength between the two strip line resonators.

10. The small-sized plate-type gold strip line quadrupole device according to claims 5-7, characterized in that: The electrical coupling is barrier-free isolation between the branches of the upper halves of the two stripline resonators; the distance between the branches of 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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