CN205028994U - Ware is divided to ultra wide band merit based on T type branch - Google Patents

Abstract

The utility model discloses a ware is divided to ultra wide band merit based on T type branch, this merit divides the ware to include upper microstrip structure, isolated component, middle medium base plate and underlying metal floor, upper strata microstrip structure is by input section's transmission line, T type branch, three I/O (IO) port component, the merit divides the ware through increasing a transfer mode, makes the bandwidth widen, obtains the free transmission range and arrives 3.5GHz for 1.7GHz, be greater than 15dB at two output port with resistance and electric capacity messenger isolation, through using short circuit minor matters line, additionally produce a transmission zero, symmetrical structure makes the merit to divide branch homophases such as ware output.

Description

A UWB Power Splitter Based on T-Branch

technical field

The utility model relates to the technical field of radio frequency communication, in particular to an ultra-wideband power divider based on T-shaped branches.

Background technique

The existing power divider is a multi-port microwave network that divides the input signal power into equal or unequal outputs. With the rapid development of wireless communication technology, the carrier frequency of various communication systems continues to increase. Miniaturized and low-power high-frequency electronic devices and circuit design make microwave technology play its advantages. In order to make the gain of the system meet the actual requirements, it must be realized Multi-wave transmission, that is, power distribution. The power divider is widely used in the feeding system of the antenna, and has been extensively studied at home and abroad. In the past few decades, there has been a lot of research on power dividers. The focus of the research is widening the frequency band, reducing the area, dual frequency response and harmonic suppression.

In 1960, EmestJ.Wilkinson published a paper named AnN-wayhybridPowerDivider, which introduced an N-port power divider with matching, low loss, high isolation, and in-phase at all ports, that is, the Wilkinson power divider. Its evolution has gone through the initial coaxial form, to the widely used microstrip and stripline forms, and the air stripline and air coaxial forms that are used under high power.

However, with the rapid development of communication technology and the rapid development of military technology, coupled with the incentive competition among the communication industry today, the traditional Wilkinson power splitter is far from meeting the requirements because it can only work in a single frequency band or odd harmonics. .

The narrow bandwidth of the traditional Wilkinson power divider limits its application in broadband systems. In order to further widen the operating bandwidth, a multi-section broadband power divider can be used, that is, the number of λg/4 line segments and corresponding isolation resistors can be increased. However, the result of this design is that the size of the circuit is too large, which brings inconvenience to the integration of devices in the future and is not conducive to later processing.

Contents of the invention

In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide an ultra-wideband power splitter based on T-shaped branches. The signal power is equally divided and the phase is the same.

The purpose of this utility model is achieved through the following technical solutions:

An ultra-wideband power divider based on T-shaped branches, including: an upper microstrip structure, an isolation element, an intermediate dielectric substrate and a bottom metal floor, the upper microstrip structure is arranged on the upper surface of the intermediate dielectric substrate, and the bottom metal floor is arranged in the middle the lower surface of the dielectric substrate;

The upper layer microstrip structure includes an input transmission line, a T-shaped branch, a short-circuit stub line and an input/output port; the middle part of the input transmission line is set as a wide low-impedance line; the short-circuit stub line is set at the input The connection between the transmission line and the T-shaped branch; an isolation element is arranged between the output ports.

Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

Use the input part to set a low-impedance line with a large width to realize a dual-mode power divider, which increases the bandwidth and reduces the circuit size;

Isolation components connected between the output ports include capacitors and resistors to increase isolation.

Description of drawings

Fig. 1 is a schematic structural diagram of an ultra-wideband power divider based on a T-branch;

Fig. 2 is a dimensional drawing of an ultra-wideband power divider based on a T-branch;

Fig. 3 is S ₂₃ parameters, S ₁₁ parameters, S ₃₁ parameters and S ₂₁ parameters of the experimental results figure;

Fig. 4 is a diagram of the experimental results of the phase difference and the amplitude difference of the S ₃₁ parameter and the S ₂₁ parameter.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the implementation of the utility model will be further described in detail below with reference to the examples and drawings.

As shown in Figure 1, it is an ultra-wideband power divider structure based on T-shaped branches, including an upper microstrip structure, an isolation element, an intermediate dielectric substrate, and a bottom metal floor. The upper microstrip structure is arranged on the upper surface of the intermediate dielectric substrate, and the bottom layer The metal floor is arranged on the lower surface of the intermediate medium substrate;

The upper layer microstrip structure includes an input transmission line, a T-shaped branch, a short-circuit stub line and an input/output port; the middle part of the input transmission line is set as a wide low-impedance line; the short-circuit stub line is set at the input The connection between the transmission line and the T-shaped branch; an isolation element is arranged between the output ports.

The above-mentioned larger low-impedance line can be used to implement a dual-mode power divider to increase bandwidth; the above-mentioned short-circuit branch line is set at the connection between the input transmission line and the T-shaped branch to generate a transmission zero point and realize bandwidth control.

The above-mentioned input transmission line is connected to the main transmission line of the T-shaped branch, and two output ports are located on the two branch lines of the T-shaped branch, and are symmetrical up and down.

The above input transmission line is formed by sequentially connecting the first microstrip line 1, the second microstrip line 2, the third microstrip line 3, the fourth microstrip line 4 and the fifth microstrip line 5;

The short-circuit branch line is formed by sequentially connecting the sixth microstrip line 6, the seventh microstrip line 7, the eighth microstrip line 8 and the ninth microstrip line 9, wherein one end of the ninth microstrip line is passed through a metal The through hole 18 is grounded;

The T-shaped branch is composed of a main transmission line and two symmetrical branch lines, including an eleventh microstrip line 11, a twelfth microstrip line 12, a thirteenth microstrip line 13, a fourteenth microstrip line 14, The fifteenth microstrip line 15, the sixteenth microstrip line 16 and the seventeenth microstrip line 17; one end of the sixteenth microstrip line is connected to the first output port, and one end of the seventeenth microstrip line is connected to the first output port. The two output ports are connected.

The isolation element is connected between the twelfth microstrip line and the thirteenth microstrip line, and the isolation element includes two resistors 19 with the same resistance value and a capacitor 20; the resistors are respectively arranged at both ends of the capacitor.

The length of the short-circuited stub line is half of the wavelength of the waveguide corresponding to the frequency of the transmission zero generated by the short-circuited stub line.

As shown in Figure 2, for the design of the broadband equal power divider provided in this embodiment, the specific circuit size is selected as follows (but not limited to this size): W ₁ =W ₃ =W ₅ =W ₈ =W ₁₀ =1.86 mm, W ₂ =1.8mm, W ₄ =3.4mm, W ₆ =2mm, W ₇ =0.6mm, W ₉ =1.6mm, L ₁ =8.1mm, L ₂ =4.5mm, L ₃ =0.1mm, L ₄ = 9.78 mm, L ₅ = 0.6 mm, L ₆ = 1 mm, L ₇ = 2.4 mm, L ₈ = 10 mm, L ₉ = 2.1 mm, L ₁₀ = 6.2 mm, L ₁₁ = 2 mm, L ₁₂ = 9.64 mm, L ₁₃ =4.46 mm, L ₁₄ =3.4 mm, r ₁ =0.15 mm. In this design, the loading capacitance C of the isolation element is 1.3pF, the resistance value R ₁ =R ₂ is 30Ω, and the dielectric substrate used is Rogers4003. The overall size of the circuit is 32.5mm×14.6mm.

Figure 3 shows the experimental results of S ₂₃ parameters, S ₁₁ parameters, S ₃₁ parameters and S ₂₁ parameters. It can be seen that the bandwidth is from 1.7GHz to 3.5GHz and the isolation is greater than 15dB. The output signals of the two ports are equally divided in the passband.

As shown in Figure 4, it is the experimental result diagram of the phase difference between the _S31 parameter and the _S21 parameter, it can be seen that the two output signals are in phase.

The T-branch based ultra-wideband power splitter provided in the above embodiments has excellent performances of wideband, high isolation, and small size, and is suitable for use in radio frequency front-ends of wireless communication systems.

Although the embodiments disclosed in the present utility model are as above, the content described is only an embodiment adopted for the convenience of understanding the present utility model, and is not intended to limit the present utility model. Anyone skilled in the technical field to which the utility model belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the utility model, but the patent of the utility model The scope of protection must still be based on the scope defined in the appended claims.

Claims (5)

1. An ultra-wideband power splitter based on T-branches, comprising an upper microstrip structure, an isolation element, an intermediate dielectric substrate and a bottom metal floor, the upper microstrip structure is arranged on the upper surface of the intermediate dielectric substrate, and the bottom metal floor is arranged on The lower surface of the intermediary substrate; characterized in that, The upper layer microstrip structure includes an input transmission line, a T-shaped branch, a short-circuit stub line and an input/output port; the middle part of the input transmission line is set as a wide low-impedance line; the short-circuit stub line is set at the input The connection between the transmission line and the T-shaped branch; an isolation element is arranged between the output ports. 2. The ultra-wideband power divider based on T-type branch as claimed in claim 1, wherein the input transmission line is connected with the main transmission line of the T-type branch, wherein two output ports are located at two of the T-type branch On the branch line, and symmetrical up and down. 3. the ultra-wideband power divider based on T-type branch as claimed in claim 1, is characterized in that, The input transmission line is formed by sequentially connecting the first microstrip line, the second microstrip line, the third microstrip line, the fourth microstrip line and the fifth microstrip line; The short-circuit branch line is formed by sequentially connecting the sixth microstrip line, the seventh microstrip line, the eighth microstrip line and the ninth microstrip line, wherein one end of the ninth microstrip line is grounded through a metallized via hole ; The T-shaped branch is composed of the main transmission line and two symmetrical branch lines, including the eleventh microstrip line, the twelfth microstrip line, the thirteenth microstrip line, the fourteenth microstrip line, and the fifteenth microstrip line. stripline, sixteenth microstrip line and seventeenth microstrip line; one end of the sixteenth microstrip line is connected to the first output port, and one end of the seventeenth microstrip line is connected to the second output port. 4. The ultra-wideband power divider based on T-shaped branch as claimed in claim 1, wherein the isolating element is connected between the twelfth microstrip line and the thirteenth microstrip line, and the isolating element comprises a A capacitor and two resistors with the same resistance value; the resistors are respectively arranged at both ends of the capacitor. 5. the ultra-wideband power divider based on T-type branch as claimed in claim 1, is characterized in that, the length of described short-circuit stub line is the corresponding waveguide wavelength of the transmission zero point frequency that this short-circuit stub line produces half.