Lumped parameter four-way power divider

Abstract

The utility model belongs to the technical field of power dividers, and discloses a lumped parameter four-path power divider, which comprises three zero-degree one-to-two power dividing units with the same structure, one of the zero-degree one-to-two power dividing units is used as a first-stage power divider, the input ends of the other two zero-degree one-to-two power dividing units are respectively connected with the output end of the first-stage power divider, and the output end of the other zero-degree one-to-two power dividing units are respectively connected with the output end of the second-stage power divider. The first-stage power divider serves as a second-stage power divider; the zero-degree one-to-two power dividing unit comprises a first port P1, a second port P2 and a third port P3, the first port P1 is connected with a first capacitor C1, the first capacitor C1 is respectively connected with the second port P2 and the third port P3, and a first inductor L1, a second capacitor C2 and a third inductor L3 are sequentially arranged between the first capacitor C1 and the second port P2; and a second inductor L2, a third capacitor C3 and a fourth inductor L4 are sequentially arranged between the first capacitor C1 and the third port P3. According to the utility model, the area of the power divider can be effectively reduced, and the power divider can better adapt to low-frequency parts.

Description

Technical Field

[0001] The utility model belongs to the technical field of power dividers, and in particular relates to a lumped parameter four-way power divider. Background Art

[0002] A power divider (abbreviated as power divider) is a multi-port microwave device that divides input power into several equal or unequal power outputs. It is used in many circuits such as microwave power sensors, mixers, and phase detection. In high-frequency systems such as microwave millimeter waves, it is necessary to distribute the transmit or receive power to each unit in a certain proportion. Therefore, microwave millimeter wave power dividers have been widely used in microwave millimeter wave components and systems, and are also a key component.

[0003] Most of the 1:4 power dividers on the market are designed with a microstrip line structure. The inventors found that this type of power divider has the following problems:

[0004] 1. In order to make it work in a wider frequency band, the bandwidth is generally widened by increasing the number of isolation resistors and the number of transmission lines. However, due to its own structural limitations, it will produce higher losses, and the additional impact of increasing the isolation resistor distribution parameters will lead to a large difference between the test results and the calculated results, and the performance of the Wilkinson power divider will decrease. In addition, its volume is relatively large;

[0005] 2. When the Wilkinson power divider is used in a higher frequency band, the wavelength will be comparable to the size of the isolation resistor, and the distributed parameters at the isolation resistor cannot be ignored. The distributed parameters are difficult to predict in the power divider simulation design and have a great impact on the final test results. Although thin film resistors can be used in the prior art to reduce the distributed parameters, the resistance value of thin film resistors has the problem of calculation deviation and the manufacturing cost is high;

[0006] 3. When using microstrip power dividers in lower frequency bands, the wavelength will be too long, and the length of the microstrip line on the corresponding string arm will also be too long. In this case, the size of the power divider will increase significantly, resulting in a decrease in applicability and an increase in manufacturing costs; and the error between the processing of the overly long microstrip line and the design simulation results will also increase, making the design results difficult to predict. Utility Model Content

[0007] The utility model aims to solve the above technical problems at least to a certain extent. To this end, the utility model aims to provide a lumped parameter four-way power divider.

[0008] The technical solution adopted by the utility model is:

[0009] A lumped parameter four-way power divider comprises three zero-degree one-to-two power divider units of the same structure, wherein one zero-degree one-to-two power divider unit is used as a first-stage power divider, and the input ends of the other two zero-degree one-to-two power divider units are respectively connected to the output ends of the first-stage power divider to serve as second-stage power dividers;

[0010] The zero-degree one-to-two power splitting unit includes a first port P1, a second port P2 and a third port P3. The first port P1 is connected to a first capacitor C1, and the first capacitor C1 is connected to the second port P2 and the third port P3 respectively. A first inductor L1, a second capacitor C2 and a third inductor L3 are arranged in sequence between the first capacitor C1 and the second port P2; a second inductor L2, a third capacitor C3 and a fourth inductor L4 are arranged in sequence between the first capacitor C1 and the third port P3.

[0011] Preferably, the connection circuit between the second capacitor C2 and the third inductor L3 and the connection circuit between the third capacitor C3 and the fourth inductor L4 are connected via a first resistor R1.

[0012] Preferably, a fourth capacitor C4, a second resistor R2 and a fifth capacitor C5 are sequentially arranged between the connection circuit between the third inductor L3 and the second port P2 and the connection circuit between the fourth inductor L4 and the third port P3.

[0013] The beneficial effects of the utility model are:

[0014] The lumped parameter four-way power divider provided by the utility model converts the microstrip line power divider into a lumped element structure for design, utilizes the equivalent model of the microstrip line, replaces the microstrip line with a lumped element, and optimizes the impedance characteristics to offset the lumped element influenced by the parasitic parameters of the microstrip line. In addition, after the microstrip line is replaced with the lumped parameter element, the area of ​​the power divider can be effectively reduced and the low-frequency part can be better adapted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the structural diagram of a one-to-two single-section Wilkinson power divider.

[0016] Figure 2 The utility model is a circuit diagram of a zero-degree one-to-two power division unit.

[0017] Figure 3 It is a layout of a lumped parameter four-way power divider of the utility model. DETAILED DESCRIPTION

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

[0019] It should be understood that it should also be noted that in the embodiment, the functions / actions that appear may be different from the order in which the drawings appear. For example, depending on the functions / actions involved, they can actually be executed substantially concurrently, or two figures shown in succession can sometimes be executed in the reverse order.

[0020] The lumped parameter four-way power divider of this embodiment includes three zero-degree one-to-two power divider units with the same structure, one of which is used as a first-stage power divider, and the input ends of the other two zero-degree one-to-two power divider units are respectively connected to the output ends of the first-stage power divider as second-stage power dividers, ultimately achieving the effect of a one-to-four power divider.

[0021] like Figure 1 As shown in the figure, in the one-to-two single-section Wilkinson power divider, port 1 is the input port, ports 2 and 3 are the output ports, the input impedance is Z0, and the load impedances of the two output ports are Z2 and Z3 respectively. In order to match the load impedance with the power divider, 1 / 4 wavelength impedance transformers are used on the two power dividers, and the characteristic impedances are Z C2 , Z C3 The resistor R in the middle of the 2-way output port is an isolation resistor. Its function is to consume energy reflected back from the output port through the resistor without affecting the output at the other end.

[0022] The zero-degree one-to-two power splitter unit of this embodiment performs equivalent impedance transformation on each microstrip line in the one-to-two single-section Wilkinson power splitter, and then replaces it with a lumped element to obtain the following: Figure 2 A zero-degree one-to-two power splitting unit of a lumped element is shown, and the zero-degree one-to-two power splitting unit includes a first port P1, a second port P2 and a third port P3. The first port P1 is connected to a first capacitor C1, and the first capacitor C1 is respectively connected to the second port P2 and the third port P3. A first inductor L1, a second capacitor C2 and a third inductor L3 are sequentially arranged between the first capacitor C1 and the second port P2; a second inductor L2, a third capacitor C3 and a fourth inductor L4 are sequentially arranged between the first capacitor C1 and the third port P3.

[0023] Specifically, the connection circuit between the second capacitor C2 and the third inductor L3 is connected to the connection circuit between the third capacitor C3 and the fourth inductor L4 through the first resistor R1. The connection circuit between the third inductor L3 and the second port P2 is connected to the connection circuit between the fourth inductor L4 and the third port P3 by sequentially provided with a fourth capacitor C4, a second resistor R2 and a fifth capacitor C5.

[0024] Appropriately adjust the bandwidth and insertion loss of the one-to-two power splitter, layout, draw and replace the layout, effectively utilize the space, and finally obtain the layout of the lumped parameter four-way power splitter as shown below: Figure 3 As shown. The frequency of the lumped parameter four-way power divider is 6~18GHz, the insertion loss is less than 2.5dB, the isolation is greater than 20dB, and the test value is consistent with the simulation value. The simulation results and experimental results show that compared with the traditional microstrip line power divider, this lumped parameter power divider has a compact structure and a small size; it is easy to design and produce for lower frequencies. A higher isolation and a wider working bandwidth can be achieved in a limited space.

[0025] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. A lumped parameter four-way power divider, characterized in that: It comprises three zero-degree one-to-two power dividing units with the same structure, wherein one zero-degree one-to-two power dividing unit serves as a first-stage power divider, and the input ends of the other two zero-degree one-to-two power dividing units are respectively connected to the output ends of the first-stage power divider to serve as a second-stage power divider; The zero-degree one-to-two power splitting unit includes a first port P1, a second port P2 and a third port P3. The first port P1 is connected to a first capacitor C1, and the first capacitor C1 is connected to the second port P2 and the third port P3 respectively. A first inductor L1, a second capacitor C2 and a third inductor L3 are arranged in sequence between the first capacitor C1 and the second port P2; a second inductor L2, a third capacitor C3 and a fourth inductor L4 are arranged in sequence between the first capacitor C1 and the third port P3.

2. The lumped parameter four-way power divider according to claim 1, characterized in that: The connection circuit between the second capacitor C2 and the third inductor L3 and the connection circuit between the third capacitor C3 and the fourth inductor L4 are connected via the first resistor R1.

3. The lumped parameter four-way power divider according to claim 1, characterized in that: A fourth capacitor C4, a second resistor R2 and a fifth capacitor C5 are sequentially arranged between the connection circuit between the third inductor L3 and the second port P2 and the connection circuit between the fourth inductor L4 and the third port P3.

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