WO2018184425A1

WO2018184425A1 - Ultra-wideband wilkinson power divider

Info

Publication number: WO2018184425A1
Application number: PCT/CN2018/076270
Authority: WO
Inventors: 周海峰; 丁庆; 吴光胜; 李晓丛; 吴杰
Original assignee: 深圳市华讯方舟微电子科技有限公司; 深圳市太赫兹科技创新研究院有限公司
Priority date: 2017-04-07
Filing date: 2018-02-11
Publication date: 2018-10-11
Also published as: CN107086345A; CN107086345B

Abstract

The present invention relates to an ultra-wideband Wilkinson power divider. The power divider comprises a dielectric layer, a signal metal layer attached to one side of the dielectric layer, and a metal bottom layer attached to the other side of the dielectric layer. The signal metal layer comprises: a microwave transmission branch used to divide a microwave signal into multiple microwave branch signals for output; and a microstrip line expansion structure used to increase the number of poles of the Wilkinson power divider, wherein the microstrip line expansion structure is composed of microstrip lines, and has one end connected to the microwave transmission branch and the other end is a free end, and the length of each microstrip line is 1/4 a of central wavelength of microwaves passing through the ultra-wide-band Wilkinson power divider. By arranging a microstrip line expansion structure on a transmission branch of a Wilkinson power divider, the number of poles of the Wilkinson power divider are increased, such that a frequency band can be broadened, thereby achieving an ultra-wide-band Wilkinson power divider with a simple structure.

Description

Ultra-wideband Wilkinson Power Splitter

Technical field

The invention relates to the field of power dividers, and in particular to an ultra-wideband Wilkinson power divider.

Background technique

Power splitters have a wide range of applications in microwave and millimeter wave communication circuits, such as microwave power sensors, mixers, phase detection, and TR components. At present, with the rapid development of wireless communication technology, the broadband and low loss of devices have become the research hotspots in microwave radio frequency circuits, and with the research and application of ultra-wideband devices such as ultra-wideband antennas and ultra-wideband filters, The demand for broadband power splitters is also growing.

However, the traditional Wilkinson power splitter has a narrow bandwidth, which seriously restricts the use of the Wilkinson power splitter in the ultra-wideband field.

Summary of the invention

Based on this, it is necessary to provide a simple ultra-wideband Wilkinson power splitter for the narrow bandwidth of the traditional Wilkinson power splitter.

An ultra-wideband Wilkinson power divider comprising a dielectric layer, a signal metal layer attached to one side of the dielectric layer, and a metal underlayer attached to the other side of the dielectric layer, the signal metal layer comprising:

a microwave transmission branch for dividing a microwave signal into multiple microwave branch signal outputs;

The microstrip line expansion structure is composed of a microstrip line, one end of the microstrip line expansion structure is connected to the microwave transmission branch, and the other end is suspended, and the length of the microstrip line is passed through the ultra-wideband The 1/4 center wavelength of the microwave of the Jinsen splitter is used to increase the pole of the Wilkinson power splitter.

The ultra-wideband Wilkinson power divider includes a dielectric layer, a signal metal layer attached to one side of the dielectric layer, and a metal underlayer attached to the other side of the dielectric layer. The signal metal layer comprises a microwave transmission branch and a microstrip line extension structure, the microstrip line expansion structure is composed of a microstrip line, one end of the microstrip line expansion structure is connected to the microwave transmission branch, and the other end is Suspended, used to increase the pole of the Wilkinson power splitter; by setting the microstrip line expansion structure on the transmission branch of the Wilkinson power splitter, increasing the pole of the Wilkinson power splitter, you can broaden its frequency band and get A simple ultra-wideband Wilkinson power splitter.

In one embodiment, the microwave transmission branch includes a first trunk microstrip line and a second backbone microstrip line, and one end of the microstrip line expansion structure is connected to the first trunk microstrip line and the second On the transmission channel between the main microstrip lines, the other end is suspended.

In one embodiment, the microstrip line expansion structure includes a single microstrip line disposed parallel to the microwave transmission direction and two microstrip line branches having the same structure perpendicular to the microwave transmission direction, the single microstrip line Connected between the first trunk microstrip line and the second trunk microstrip line, one end of each microstrip line branch is respectively connected to one end of the single microstrip line, and the other end is suspended.

In one embodiment, the microstrip line branch includes a first microstrip line and a second microstrip line, and one end of the first microstrip line is connected to one end of the single microstrip line, the first micro The other end of the strip line is connected to one end of the second microstrip line, and the other end of the second microstrip line is suspended.

In one embodiment, the impedance ratio of the second microstrip line to the first microstrip line is 2.25:1.

In one embodiment, the microwave transmission branch has two, and each of the microwave transmission branches is provided with the microstrip line extension structure.

In one embodiment, an isolation resistor is further included, one end of the isolation resistor is connected to one end of the first trunk microstrip line connected to the single microstrip line in a microwave transmission branch, and the other end of the isolation resistor is connected Another end of the microwave transmission branch in which the first trunk microstrip line is connected to a single microstrip line.

In one embodiment, the signal metal layer and the metal underlayer are made of gold.

In one of the embodiments, the single microstrip line has a resistance of 50 Ω.

In one of the embodiments, the isolation resistor has a resistance of 100 Ω.

DRAWINGS

1 is a schematic structural diagram of an ultra-wideband Wilkinson power divider in an embodiment;

2 is a schematic structural diagram of an ultra-wideband Wilkinson power divider in another embodiment;

3 is a waveform diagram of a port reflection coefficient of an ultra-wideband Wilkinson power divider in an embodiment;

4 is a waveform diagram of an output port insertion loss of an ultra-wideband Wilkinson power divider in an embodiment;

5 is a phase diagram of an output port insertion loss of an ultra-wideband Wilkinson power divider in an embodiment;

6 is a waveform diagram showing the isolation of an output port of an ultra-wideband Wilkinson power divider in an embodiment.

detailed description

Referring to FIG. 1, FIG. 1 is a schematic structural diagram of an ultra-wideband Wilkinson power divider according to an embodiment.

In this embodiment, the ultra-wideband Wilkinson power divider includes a dielectric layer, a signal metal layer attached to one side of the dielectric layer, and a metal underlayer attached to the other side of the dielectric layer, the signal metal The layers include

microwave transmission branches

11, 12 and microstrip

line extension junctions

20,21.

The

microwave transmission branches

11, 12 are used to divide one microwave signal into multiple microwave branch signal outputs.

A conventional Wilkinson power splitter includes a dielectric layer, a signal metal layer attached to one side of the dielectric layer, and a metal underlayer attached to the other side of the dielectric layer. For example, the two-power splitter has two

microwave transmission branches

11, 12 in the signal metal layer, and each of the

microwave transmission branches

11 and 12 includes a microstrip line connected in series, and the microwave enters the port through the input port, that is, the microstrip line 10. The skin effect of the Jinsen splitter is generated, so that the microwave is concentrated in the signal metal layer located on the surface layer, and the microwave is divided into two microwave branch signals after passing through the two

microwave transmission branches

11, 12, and then the microwave is divided into two parts. The Wilkinson power splitter is a two-power splitter, not limited to a two-power splitter.

Specifically, the dielectric layer adopts an alumina ceramic having a dielectric constant of 9.9, and the signal metal layer and the metal underlayer are both gold, and the gold has high electrical conductivity, high natural frequency, and good skin effect.

The microstrip

line expansion structure

20, 21 is composed of a microstrip line, one end of the microstrip line extension structure 20 is connected to the microwave transmission branch 11 and the other end is suspended, and one end of the microstrip line extension structure 21 is connected to the microwave transmission branch. On the road 12, the other end is suspended, and the length of the microstrip line is 1/4 of the center wavelength of the microwave passing through the ultra-wideband Wilkinson power divider, and is used to increase the pole of the Wilkinson power splitter. The Wilkinson power divider refers to the traditional Wilkinson power splitter.

Microstrip extension structures

20, 21 are disposed on each of the

microwave transmission branches

11, 12 of the conventional Wilkinson power divider, and the

microstrip extension structures

20, 21 are composed of microstrip lines, each microstrip The length of the line is the 1/4 center wavelength of the microwave passing through the ultra-wideband Wilkinson power divider. One end of the microstrip

line expansion structure

20, 21 is connected to the

microwave transmission branches

11, 12, and the other end is suspended, so that the microstrip line is open, and the 1/4 central wavelength open microstrip line can be equivalent to a capacitance to ground. In turn, the poles of the Wilkinson power divider can be increased, thereby broadening the frequency band.

In one embodiment, the microwave transmission branch 11 includes a first trunk microstrip line 111 and a second backbone microstrip line 112, and the microwave transmission branch 12 includes a first backbone microstrip line 121 and a second backbone microstrip line 122. . One end of the microstrip line expansion structure 20 is connected to the transmission channel between the first trunk microstrip line 111 and the second trunk microstrip line 112, and the other end is suspended; one end of the microstrip line extension structure 21 is connected to the first The other end is suspended on the transmission path between the main microstrip line 121 and the second main microstrip line 122.

The second

trunk microstrip lines

112 and 122 respectively located on the two

microwave transmission branches

11 and 12 serve as output ports of the two branches, respectively, and further output the microwave branch signals after the two power divisions.

Referring to FIG. 2, in one embodiment, the microstrip line expansion structure 20 on the microwave transmission branch 11 includes a single microstrip line 203 disposed parallel to the microwave transmission direction and the same two-way structure disposed perpendicular to the microwave transmission direction. The microstrip line branch, the microstrip line extension structure 21 on the microwave transmission branch 12 includes a single microstrip line 213 disposed laterally and two microstrip line branches of the same structure disposed longitudinally. A single microstrip line 203 is connected between the first trunk microstrip line 111 and the second trunk microstrip line 112 of the microwave transmission branch 11, and a single microstrip line 213 is connected to the first trunk microstrip line of the microwave transmission branch 12. 121 is between the second trunk microstrip line 122. One end of the microstrip line branch with the same two-way structure is connected to the two ends of the single microstrip line 203, and the other end is suspended, and the microstrip line expanding structure 21 has two ends of the same microstrip line branch respectively The two ends of the single microstrip line 213 are connected, and the other end is suspended.

The microstrip

line extension structures

20, 21 form a bandpass filter that increases the poles of the Wilkinson power divider and broadens its frequency. At the same time, the microstrip line expansion structure is composed of microstrip lines, and each microstrip line forms a capacitance with the dielectric layer and the metal underlayer respectively. According to the charge and discharge characteristics of the capacitor, the power consumption is small, so that the ultra-wideband Wilkinson function The insertion loss of the divider is very low, which reduces the loss of the microwave during transmission and improves the transmission power of the microwave.

Further, the second microstrip line 202 and the first microstrip line 201, the second microstrip line 205 and the first microstrip line 204, the second microstrip line 212 and the first microstrip line 211, and the second microstrip line The impedance ratio between the 215 and the first microstrip line 214 is 2.25:1. At this time, the ultra-wideband Wilkinson power divider can pass the widest microwave frequency band, and the impedance ratio can be adjusted according to actual needs to obtain an ideal frequency bandwidth.

The second microstrip line 202 is 1/4 center wavelength and is in an open state, which can be equivalent to a capacitance to ground. For microwave signals, it is equivalent to short circuit to ground, and the first microstrip line 201 in series is also 1/1. The center wavelength, which is seen from one end of the first microstrip line 201, is equivalent to an open circuit, thereby forming a pole.

Referring to FIG. 3, FIG. 3 is a waveform diagram of a port reflection coefficient of an ultra-wideband Wilkinson power divider in an HFSS simulation environment according to an embodiment. The abscissa represents the frequency, and the ordinate represents the amplitude in decibels, which is the variation of the reflection coefficient of the input port and the output port of the ultra-wideband Wilkinson power divider with frequency. Wherein, curve 31 represents a waveform diagram of the input port reflection coefficient S(1, 1), curve 32 represents a waveform diagram of an output port reflection coefficient S(2, 2), and curve 33 represents another output port reflection coefficient S (3.3) Waveform. It can be seen that the ultra-wideband Wilkinson power splitter has an input port reflection coefficient S(1,1) of less than -15 dB in the frequency band of 18 GHz to 40 GHz, and two output port reflection coefficients S(2, 2), S. (3,3) is less than -13.8dB. The ultra-wideband Wilkinson power splitter has a small reflection coefficient, low reflection power consumption, and high transmission power.

Referring to FIG. 4, FIG. 4 is a waveform diagram of an output port insertion loss of an ultra-wideband Wilkinson power divider in an embodiment. The abscissa indicates the frequency, and the ordinate indicates the amplitude in decibels, which is the change of the insertion loss S(2,1) and S(3,1) of the two output ports of the ultra-wideband Wilkinson power divider with frequency. Happening. It can be seen that the ultra-wideband Wilkinson power splitter has an insertion loss S(2,1) and S(3,1) of the two output ports of less than 0.2 dB in the frequency band of 18 GHz to 40 GHz. In the case of ensuring that the insertion loss of the two output ports is less than 0.2 dB, the microwave frequency that the ultra-wideband Wilkinson power divider can process can be expanded to 2 times, 40/18>2 times.

Referring to FIG. 5, FIG. 5 is a phase diagram of the insertion loss of the output port of the ultra-wideband Wilkinson power divider in an embodiment. The abscissa represents the frequency, and the ordinate represents the phase in degrees, which is the phase of the insertion loss S(2,1) and S(3,1) of the two output ports of the ultra-wideband Wilkinson power divider with frequency. Changes. It can be seen that the ultra-wideband Wilkinson power splitter has the same insertion and loss phase of the two output ports in the frequency band of 18 GHz to 40 GHz, so that the two microwave branch signals obtained after the two-power split are in phase, and the power is divided. The effect is good.

In one embodiment, the microstrip line branch includes a

first microstrip line

201, 204 connecting the microwave transmission branch 11, a

first microstrip line

211, 214 connecting the microwave transmission branch 12, and a first microstrip line. a second microstrip line 202 connected to the second microstrip line 205 connected to the first microstrip line 204, a second microstrip line 212 connected to the first microstrip line 211, and a first microstrip line 214 The connected second microstrip line 215, the other end of the

second microstrip line

202, 205, 212, 215 is suspended.

In one embodiment, the ultra-wideband Wilkinson power divider further includes an isolation resistor R, and one end of the isolation resistor R is connected to a first trunk microstrip line 111 and a second main microstrip line in a microwave transmission branch 11 One end of the line 112 is connected, and the other end of the isolation resistor R is connected to one end of the other microwave transmission branch 12 where the first trunk microstrip line 121 and the second trunk microstrip line 122 are connected.

The isolation resistor R can reduce the interference between the two

microwave transmission branches

11 and 12. Specifically, the resistance of the isolation resistor R is 100 Ω, and the square resistance can be 50 Ω/square, 60 Ω/square or according to different materials. other.

Referring to FIG. 6, FIG. 6 is a waveform diagram of the isolation of the output port of the ultra-wideband Wilkinson power divider in an embodiment. The abscissa represents the frequency and the ordinate represents the amplitude in decibels, which is the variation of the isolation S(2,3) with the frequency between the two output ports of the ultra-wideband Wilkinson power splitter. It can be seen that the ultra-wideband Wilkinson power splitter has an isolation S (2, 3) of less than -10 dB between the two output ports in the frequency band of 18 GHz to 40 GHz, and the interference is small.

In one embodiment, the

single microstrips

203, 213, the

first microstrip lines

201, 204, 211, 214 and the

second microstrip lines

202, 205, 212, 215 of the microstrip

line extension structures

20, 21 The length is the 1/4 center wavelength of the microwave passing through the ultra-wideband Wilkinson power divider. The center wavelength is the wavelength corresponding to the center frequency of the microwave passing through the ultra-wideband Wilkinson power divider.

Further, the resistance of the

single microstrip lines

203 and 213 is 50 Ω.

The above ultra-wideband Wilkinson power splitter inserts a microstrip line extension structure composed of microstrip lines on a microwave transmission branch of a conventional Wilkinson power splitter, which can increase the pole of the Wilkinson power splitter, and further Broaden its frequency band. The microstrip line structure includes a single microstrip line disposed parallel to the microwave transmission direction and a microstrip line branch disposed perpendicular to the microwave transmission direction to form a band pass filter, the microstrip line branches including interconnection The first microstrip line and the second microstrip line, adjusting the resistance ratio thereof, can adjust the bandwidth of the ultra-wideband Wilkinson power divider, and can be adjusted according to requirements to obtain an ideal bandwidth. At the same time, the charging and discharging characteristics of the capacitor are utilized, and the power consumption is small, so that the insertion loss of the ultra-wideband Wilkinson power divider is low, the loss of the microwave during transmission is reduced, and the transmission power of the microwave is improved. In addition, an isolation circuit is disposed between the two microwave transmission branches, which can reduce interference between the two microwave transmission branches and improve the transmission quality of the microwave.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An ultra-wideband Wilkinson power divider comprising a dielectric layer, a signal metal layer attached to one side of the dielectric layer, and a metal underlayer attached to the other side of the dielectric layer, wherein the signal metal Layers include:

a microwave transmission branch for dividing a microwave signal into multiple microwave branch signal outputs;

The microstrip line expansion structure is composed of a microstrip line, one end of the microstrip line expansion structure is connected to the microwave transmission branch, and the other end is suspended, and the length of the microstrip line is passed through the ultra-wideband The 1/4 center wavelength of the microwave of the Jinsen splitter is used to increase the pole of the Wilkinson power splitter.
The ultra-wideband Wilkinson power splitter according to claim 1, wherein the microwave transmission branch comprises a first trunk microstrip line and a second backbone microstrip line, and one end of the microstrip line extension structure Connected to the transmission channel between the first trunk microstrip line and the second trunk microstrip line, and the other end is suspended.
The ultra-wideband Wilkinson power splitter according to claim 2, wherein the microstrip line expansion structure comprises a single microstrip line disposed parallel to the microwave transmission direction and a two-way structure disposed perpendicular to the microwave transmission direction. The same microstrip line is connected between the first main microstrip line and the second main microstrip line, and one end of each microstrip line is respectively connected to the single microstrip line One end, the other end is suspended.
The ultra-wideband Wilkinson power splitter according to claim 3, wherein the microstrip line branch comprises a first microstrip line and a second microstrip line, and one end of the first microstrip line is connected to One end of the single microstrip line is connected to one end of the second microstrip line, and the other end of the second microstrip line is suspended.
The ultra-wideband Wilkinson power divider according to claim 4, wherein an impedance ratio of the second microstrip line to the first microstrip line is 2.25:1.
The ultra-wideband Wilkinson power splitter according to claim 5, wherein the microwave transmission branch has two, and each of the microwave transmission branches is provided with the microstrip line extension structure.
The ultra-wideband Wilkinson power splitter according to claim 6, further comprising an isolation resistor, wherein one end of the isolation resistor is connected to the first trunk microstrip line and a single microstrip in a microwave transmission branch One end of the line connection, the other end of the isolation resistor is connected to one end of the other microwave transmission branch in which the first trunk microstrip line is connected to a single microstrip line.
The ultra-wideband Wilkinson power divider according to claim 1, wherein the signal metal layer and the metal underlayer are made of gold.
The ultra-wideband Wilkinson power divider according to claim 3, wherein the single microstrip line has a resistance of 50 Ω.
The ultra-wideband Wilkinson power splitter according to claim 7, wherein the resistance of the isolation resistor is 100 Ω.