阅读说明：本技术 四等分微带功分器 (Quartering microstrip power divider ) 是由 崔杰龙 杜广湘 于 2021-03-29 设计创作，主要内容包括：本发明公开了一种四等分微带功分器,该四等分微带功分器包括壳体(1)、信号输入输出端口组(2)以及采用多支节蛇形结构输出其功率分配信号的多个功分器拓扑连接的功分器组件(3)。本发明在威尔金森功分器拓扑基础上,采用五支节蛇形走线展宽频段,使频段扩至DC-6G；减小各支节长度,使其小于λ/4,并尽可能缩小各支节耦合距离以减小尺寸；通过调节各支节的特性阻抗等措施,提高微带隔离度,使耦合器在尺寸和性能之间达到最优,既满足小型化设计要求又满足隔离度要求。旨在解决现有技术中存在的在空间要求更高的使用环境下,传统的威尔金森功分器的小型化要求并不足够的技术问题。(The invention discloses a quartering microstrip power divider, which comprises a shell (1), a signal input/output port group (2) and a power divider assembly (3) which is in topological connection with a plurality of power dividers and outputs power distribution signals of the power dividers by adopting a multi-branch-section serpentine structure. On the basis of a Wilkinson power divider topology, five-branch snakelike routing is adopted to widen the frequency band, so that the frequency band is expanded to DC-6G; reducing the length of each branch section to be less than lambda/4, and reducing the coupling distance of each branch section as much as possible to reduce the size; by means of measures such as adjusting the characteristic impedance of each branch section, the microstrip isolation is improved, the coupler is optimized between size and performance, and the requirements of miniaturization design and isolation are met. The power divider aims to solve the technical problem that the miniaturization requirement of the traditional Wilkinson power divider is not enough under the use environment with higher space requirement in the prior art.)

1. The quarter microstrip power divider is characterized by comprising:

a housing (1);

the signal input and output port group comprises a signal input port (201) arranged at one end of the shell (1) and a signal output port group arranged at the other end of the shell (1);

the power divider assembly comprises three one-to-two power dividers which are arranged in a shell (1) and are in topological connection, each power divider adopts a multi-branch-section serpentine structure to output a power distribution signal of the power divider, a signal input end of the power divider assembly is connected with a signal input port (201), and a signal output end of the power divider assembly is connected with a signal output port group.

2. The quarter microstrip power splitter of claim 1 wherein the set of signal output ports includes a first signal output port (2021), a second signal output port (2022), a third signal output port (2023), and a fourth signal output port (2024).

3. The quarter microstrip power divider according to claim 2, wherein the power divider component comprises a first power divider (301), a second power divider (302), and a third power divider (303), a signal input port of the first power divider (301) is connected to the first signal input port (201), a signal output port of the first power divider (301) is connected to signal input ports of the second power divider (302) and the third power divider (303), respectively, and signal output ports of the second power divider (302) and the third power divider (303) are connected to the first signal output port (2021), the second signal output port (2022), the third signal output port (2023), and the fourth signal output port (2024), respectively.

4. The quarter microstrip power divider according to claim 1 wherein each said power divider employs a five-leg serpentine configuration to output its power division signal.

5. The quarter microstrip power divider of claim 1, wherein the input and output microstrip lines of each power divider of said power divider assembly have characteristic impedances Z_xWhere x represents the number of nodes.

6. The quarter microstrip power divider according to claim 1, wherein the transmission line length of each branch section of each power divider in said power divider assembly is λ/4, i.e. a quarter wavelength, and the transmission line characteristic impedance of each power divider gradually becomes lower along the signal transmission direction.

Technical Field

The invention relates to the field of microstrip power dividers, in particular to a quartering microstrip power divider.

Background

A power divider is a multi-port network device that can distribute equal or unequal power to input signals. The method is widely applied to antenna beam forming and wireless multi-path communication systems. With the rapid development of wireless communication technology, communication equipment coverage and diversified deployment scenes, the power divider is increasingly widely researched and applied as an important passive device. Among them, the broadband and miniaturization are the hot points of research.

For the power divider, the design requirements mainly include: the port has small standing wave coefficient, small in-band fluctuation, high port isolation, low transmission loss, good phase consistency, simple circuit form and easy batch production. The wilkinson power divider is used as a common power divider implementation form, has good port matching and high isolation, is widely applied to antenna beam forming and wireless communication, but has unsatisfactory miniaturization application, so that the wilkinson power divider is not widely applied in a plurality of environments with higher space requirements.

Chinese patent publication No. CN1290224C discloses an improved wilkinson power divider, but the miniaturization advantage of the power divider product with a 25% wavelength transmission line segment with low characteristic impedance is not outstanding in the technical solution of the patent.

Therefore, how to further miniaturize the microstrip power divider is a technical problem which needs to be solved urgently.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a quartering microstrip power divider, and aims to solve the technical problem that the miniaturization requirement of the traditional Wilkinson power divider is not enough under the use environment with higher space requirement in the prior art.

In order to achieve the above object, the present invention provides a quartering microstrip power divider, including:

a housing;

the signal input and output port group comprises a signal input port arranged at one end of the shell and a signal output port group arranged at the other end of the shell;

the power divider assembly comprises three one-to-two power dividers arranged in a shell and connected in a topological mode, each power divider adopts a multi-branch-section snake-shaped structure to output a power distribution signal, a signal input end of the power divider assembly is connected with a signal input port, and a signal output end of the power divider assembly is connected with a signal output port group.

Optionally, the signal output port group includes a first signal output port, a second signal output port, a third signal output port and a fourth signal output port.

Optionally, the power divider component includes a first power divider, a second power divider, and a third power divider, where a signal input port of the first power divider is connected to a first signal input port, a signal output port of the first power divider is respectively connected to signal input ports of the second power divider and the third power divider, and signal output ports of the second power divider and the third power divider are respectively connected to a first signal output port, a second signal output port, a third signal output port, and a fourth signal output port.

Optionally, each power divider outputs its power distribution signal in a five-branch serpentine structure.

Optionally, the characteristic impedance of the input and output microstrip lines of each power divider in the power divider component is Z_xWhere x represents the number of nodes.

Optionally, the length of the transmission line of each branch node of each power divider in the power divider component is λ/4, and the transmission line characteristic impedance of each power divider gradually becomes lower along with the signal transmission direction.

In the invention, on the basis of Wilkinson power divider topology, five-branch snakelike routing is adopted to widen the frequency band, so that the frequency band is expanded to DC-6G; reducing the length of each branch section to be less than lambda/4, and reducing the coupling distance of each branch section as much as possible to reduce the size; by means of measures such as adjusting characteristic impedance of each branch section, reflected waves generated by each branch section are counteracted, microstrip isolation is improved, the size and performance of the coupler are optimized, and the requirements of miniaturization design and isolation are met.

Drawings

Fig. 1 is a schematic structural diagram of a quarter microstrip power divider according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of each power divider in the present invention.

Wherein: 1-a shell; 201-signal input port; 2021-a first signal output port; 2022-a second signal output port; 2023-a third signal output port; 2024-a fourth signal output port; 301-a first power divider; 302-a second power divider; 303-third power divider.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a quarter microstrip power divider according to an embodiment of the present invention.

As shown in fig. 1, a quarter microstrip power divider is provided, which includes:

a housing 1; the signal input/output port group comprises a signal input port 201 arranged at one end of the shell 1 and a signal output port group arranged at the other end of the shell 1; the power divider assembly comprises three one-to-two power dividers which are arranged in a shell 1 and are in topological connection, each power divider adopts a multi-branch-section serpentine structure to output a power distribution signal, a signal input end of the power divider assembly is connected with a signal input port 201, and a signal output end of the power divider assembly is connected with a signal output port group.

It is to be understood that the signal output port set includes a first signal output port 2021, a second signal output port 2022, a third signal output port 2023 and a fourth signal output port 2024.

It should be understood that the power divider component includes a first power divider 301, a second power divider 302, and a third power divider 303, where a signal input port of the first power divider 301 is connected to the first signal input port 201, a signal output port of the first power divider 301 is connected to signal input ports of the second power divider 302 and the third power divider 303, respectively, and signal output ports of the second power divider 302 and the third power divider 303 are connected to the first signal output port 2021, the second signal output port 2022, the third signal output port 2023, and the fourth signal output port 2024, respectively.

It should be understood that each power divider outputs its power division signal in a five-node serpentine configuration.

It should be understood that the characteristic impedance of the input and output microstrip lines of each power divider in the power divider assembly is Z_xWhere x represents the number of nodes.

It should be understood that the transmission line length of each branch section of each power divider in the power divider assembly is λ/4, and the transmission line characteristic impedance of each power divider gradually becomes lower along the signal transmission direction.

Referring to fig. 2, fig. 2 is a schematic structural diagram of each power divider in the present invention.

In this embodiment, the quarter microstrip power divider is composed of three one-to-two broadband power dividers. For each one-to-two power divider, the Wilkinson power divider principle is adopted, and the characteristic impedance of the input and output microstrip lines is Z_xWhere x represents the number of nodes, the length of the transmission line between the ports is λ/4 (quarter wavelength), and the characteristic impedance isZ_xThereby realizing impedance transformation and impedance matching; and an isolation resistor is introduced to realize high isolation between the output ports.

As shown in fig. 2, when a signal is input from the port a, the signals of the port b and the port c have the same magnitude and the same phase due to circuit symmetry. Because the two ends of the resistor are equipotential, no current flows through the resistor, no power is consumed, and only the isolation function of the port b and the port c is achieved.

If the signal is reflected at the port b, one part of the signal reaches the port c through the resistor, the other part of the signal is reflected to the port a for redistribution, and the electrical length of the impedance transformation line is 90 degrees, so that the electrical length difference of the two reflected signals reaching the port c is 180 degrees, the signal amplitude is equal, the phases are opposite, and the two reflected signals are offset, so that the two output ports are isolated from each other.

In order to widen the working frequency band, a multi-section power divider can be adopted, and the number of sections is increased. That is, the λ/4 line segment and the corresponding isolation resistor are added, and if the impedances are matched, the reflected waves generated by the impedances cancel each other, so that the matched frequency band can be widened.

In this embodiment, on the basis of a wilkinson power divider topology, a five-branch serpentine routing is adopted to widen a frequency band, so that the frequency band is expanded to DC-6G; reducing the length of each branch section to be less than lambda/4, and reducing the coupling distance of each branch section as much as possible to reduce the size; by means of measures such as adjusting characteristic impedance of each branch section, reflected waves generated by each branch section are counteracted, microstrip isolation is improved, the size and performance of the coupler are optimized, and the requirements of miniaturization design and isolation are met. A parameterized model is established through simulation means such as ADS and HFSS, so that the power divider is optimal in size and has good performance.

In a preferred implementation process, in order to widen a frequency band and achieve low loss, the number of nodes x =5 is selected, DC-6GHz band coverage is realized through five-node microstrip line transformation, and the center frequency is 3.6 GHz. The relative bandwidth is 1.3. According to the lambda/4 impedance converter and the theory of the microstrip circuit, the characteristic impedance of each section of input and output microstrip line is obtained as follows:

Z₁=97.845Ω,Z₂=87.79Ω, Z₃=70.71Ω,Z₄=56.955Ω,Z₅=51.1Ω。

therefore, the width of each section of microstrip line can be calculated as follows:

w1=0.35mm,w2=0.47mm,w3=0.79mm,w4=1.21mm,w5=1.46mm

rogers RO4003C is selected as a dielectric substrate, and the length L = lambda/4 =10.5mm of each microstrip line is determined according to parameters such as dielectric constant and the like. A set of initial values of the isolation resistance is obtained by parity-mode analysis. Carrying out simulation optimization according to the preliminary parameters, reducing the length of each branch section and reducing the coupling distance of each branch section as much as possible; the balance of performance and size is achieved by adjusting the characteristic impedance of each branch section, and the like.

It should be noted that, in this embodiment, the basic topology is primarily optimized through ADS and momentum; the minimum design size and excellent performance are ensured through HFSS parametric modeling; the reliability of mass production is ensured by tolerance analysis.

The length of a basic unit of the final topological structure, namely a broadband one-to-two microstrip circuit, is 22.3mm, the widest position is only 9.2mm, the topological structure is minimized, and the miniaturization of the broadband quartering power divider is powerfully supported.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. An element defined by the phrase "comprising", without further limitation, does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.