CN210628468U

CN210628468U - Ultra-wideband multi-path microwave power divider

Info

Publication number: CN210628468U
Application number: CN201922068954.7U
Authority: CN
Inventors: 王崇
Original assignee: CETC 54 Research Institute
Current assignee: CETC 54 Research Institute
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-05-26
Anticipated expiration: 2029-11-26

Abstract

The utility model discloses a ware is divided to ultra wide band multichannel microwave merit belongs to power divider technical field. The four-stage cascade structure comprises 1-branch-3 power divider and 21 1-branch-2 power dividers which form a four-stage cascade structure, and signals are subjected to equal-power shunting through the 1-branch-3 power divider and the 1-branch-2 power divider, so that 24 paths of equal-power output signals are finally realized. The utility model discloses improved traditional two way wilkinson merit and divided the circuit, realized three routes merit and divided to adopt multistage cascade mode, realized 24 way multiplexed output. In addition, the bandwidth can be widened to 6GHz through third-order impedance transformation. The power divider circuit adopts a microstrip line form, has good bandwidth characteristics and higher stability, is free from debugging, and is particularly suitable for batch production and application in engineering.

Description

Ultra-wideband multi-path microwave power divider

Technical Field

The utility model relates to a power divider (divide the ware for short) technical field, especially indicate an ultra wide band multichannel microwave merit and divide the ware, can be used to realize X frequency channel (3.2 GHz ~9.2 GHz) ultra wide band 24 way power distribution.

Background

With the continuous development of communication systems, the effective allocation of system resources becomes an important issue, and the reuse of radio frequency channel resources is an effective way. The radio frequency switch matrix can provide gating of multiple paths of microwave signals, control transmission paths of the radio frequency signals, achieve interconnection of multiple paths of microwave signals such as an uplink and a downlink, and have wide application in many fields such as satellite communication systems, phased array antennas and radars.

The power divider is a core module in the switch matrix. The power divider is a multi-port microwave network which can divide one path of input signal power into two or more paths of equal or unequal output signals. In different application occasions, different kinds of power dividers, such as a waveguide power divider, a microstrip power divider, and the like, need to be applied. The waveguide power divider is a power divider with a cavity structure, impedance transformation is realized through a copper rod with the diameter gradually decreased from thick to thin in the cavity, the design difficulty is high, and the waveguide power divider is applied to a high-power circuit with a millimeter frequency band and is not easy to integrate with other planar circuits within a frequency band of 3.2 GHz-9.2 GHz. The microstrip line power divider is a planar structure formed by transmission lines, has simple design, excellent performance and small volume, and accords with the development trend of microwave device integration.

However, most of the existing microstrip line power dividers can only realize power distribution of integer power of 2, and the performance and stability still need to be improved.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an ultra wide band multichannel microwave merit divides ware, it has the frequency channel width that is suitable for, and bandwidth characteristic is good, and stability is higher, and the tuning position is few, debugs advantages such as simple.

The purpose of the utility model is realized like this:

the utility model provides an ultra wide band multichannel microwave power divider, its includes the medium base plate that is equipped with the microstrip circuit, the microstrip circuit is including constituting 1 minute 3 microstrip line structures and 21 the same 1 minute 2 microstrip line structures of level four cascade structure, 1 minute 3 microstrip line structures include input 50 omega microstrip line and three power branch road, 1 minute 2 microstrip line structures include input 50 omega microstrip line and two power branch road, the end of every power branch road is output 50 omega microstrip line, the power branch road is divided into first section microstrip line, second section microstrip line and third section microstrip line from the input to the output, the signal isolation resistance has all been bridged at the terminal department of first section microstrip line, second section microstrip line, third section microstrip line between the adjacent two power branch road in every microstrip line structure.

Further, in the 1-to-3 microstrip line structure, the length of the first microstrip line section on both sides is 6.284mm, the width is 0.100mm, the length of the second microstrip line section on both sides is 6.685mm, the width is 0.281mm, the length of the third microstrip line section on both sides is 7.004mm, the width is 0.490mm, the length of the middle first microstrip line section is 3.863mm, the width is 0.100mm, the length of the middle second microstrip line section is 2.323mm, the width is 0.199mm, the length of the middle third microstrip line section is 1.840mm, the width is 0.270mm, the resistance of the tail end signal isolation resistor of the first microstrip line section is 62 ohms, the resistance of the tail end signal isolation resistor of the second microstrip line section is 160 ohms, and the resistance of the tail end signal isolation resistor of the third microstrip line section is 180 ohms.

Furthermore, in the 1-to-2 microstrip line structure, the length of the first section of microstrip line is 6.300mm, the width of the first section of microstrip line is 0.174mm, the length of the second section of microstrip line is 5.700mm, the width of the second section of microstrip line is 0.285mm, the length of the third section of microstrip line is 5.826mm, the width of the third section of microstrip line is 0.454mm, the resistance value of the signal isolation resistor at the tail end of the first section of microstrip line is 100 ohms, the resistance value of the signal isolation resistor at the tail end of the second section of microstrip line is 180 ohms, and the resistance value of the signal.

Further, the dielectric constant of the dielectric substrate is 3.48, and the thickness of the dielectric substrate is 0.254 mm.

Compared with the background art, the utility model has the advantages of:

1. the utility model improves the traditional two paths of Wilkinson power dividing circuits, and realizes three paths of power dividing; and the bandwidth is widened to 6GHz through three-order impedance transformation; and a four-stage cascade mode is adopted, so that 24-path multi-path output is realized. The circuit adopts a microstrip line form, has good bandwidth characteristics and higher stability, is free from debugging and is particularly suitable for batch production and application in engineering.

2. The utility model discloses compact structure easily integrates and installs. Small volume, low cost and popularization and application value.

3. The utility model discloses on traditional Wilkinson power divides technical basis, can realize 24 ways multiplexed output in the 3.2GHz ~6.2GHz ultra wide band. Through the design of the size of the microstrip line and the resistance value of the signal isolation resistor, the full-band amplitude-frequency characteristic of the power divider can be less than 1.5dB, and the arbitrary 500MHz amplitude-frequency characteristic can be less than 2 dB; the standing waves of the input and output ports can be less than 1.5; the isolation may be greater than 15 dB.

Drawings

Fig. 1 is a schematic block diagram of an embodiment of the present invention.

Fig. 2 is a schematic block diagram of the 1/3 power divider in fig. 1.

Fig. 3 is a schematic block diagram of the 1/2 power divider in fig. 1.

Fig. 4 is a schematic structural diagram of the 1/3 power divider in fig. 1.

Fig. 5 is a schematic structural diagram of the 1/2 power divider in fig. 1.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

An ultra-wideband multi-path microwave power divider comprises a dielectric substrate provided with a microstrip circuit, wherein the microstrip circuit comprises a 1-to-3 microstrip line structure and 21 identical 1-to-2 microstrip line structures which form a four-level cascade structure, the cascade structure is shown in figure 1, the 1-to-3 power divider in the figure is realized by the 1-to-3 microstrip line structure, and the 1-to-2 power divider is realized by the 1-to-2 microstrip line structure.

As shown in fig. 2, the 1-to-3 microstrip line structure includes an input end 50 Ω microstrip line 23 and three power dividing branches, where the tail end of each power dividing branch is an output end 50 Ω microstrip line 30, the power dividing branches on both sides are divided into a first segment of microstrip line 24, a second segment of microstrip line 26 and a third segment of microstrip line 28 from the input end to the output end, the middle power dividing branch is divided into a first segment of microstrip line 25, a second segment of microstrip line 27 and a third segment of microstrip line 29 from the input end to the output end,

signal isolation resistors

31, 32 and 33 are bridged at the tail ends of the first segment of microstrip line, the second segment of microstrip line and the third segment of microstrip line between two adjacent power dividing branches, respectively, and the 1-to-3 microstrip line structure in fig. 1 and the

signal isolation resistors

31, 32 and 33. Fig. 4 is a schematic structural diagram of a 1/3 power divider on a dielectric substrate.

As shown in fig. 3, the 1-to-2 microstrip line structure includes an input end 50 Ω microstrip line 23 and two power dividing branches, where the tail end of each power dividing branch is an output end 50 Ω microstrip line 30, the two power dividing branches are divided into a first microstrip line 34, a second microstrip line 35, and a third microstrip line 36 from the input end to the output end,

signal isolation resistors

37, 38, and 39 are bridged at the tail ends of the first microstrip line, the second microstrip line, and the third microstrip line between the two power dividing branches, and the 1-to-2 power divider in fig. 1 is formed by a 1-to-2 microstrip line structure and the

signal isolation resistors

37, 38, and 39 together. Fig. 5 is a schematic structural diagram of a 1/2 power divider on a dielectric substrate.

The power divider is a 1-path 24-path power divider, and in view of the fact that 24 is not an integer power of 2, the power divider can not be realized simply by cascading 1-path 2 power dividers, therefore, the power divider is realized by cascading 1-path 3 and 21 1-path 2 power dividers, theoretically deducing the width and length of each section of microstrip line in the 1-path 2 power divider and the 1-path 3 power divider based on the traditional Wilkinson power dividing technology, carrying out simulation optimization by using microwave simulation software Ansoft design, and finally determining the specific actual sizes of the two microstrip line power dividers and the resistance values of each isolation resistor, wherein the specific sizes and the resistance values are detailed in the following table:

microstrip line label	Width/mm	Length/mm	Resistance label	Resistance value/omega
					24	0.100	6.284	31	62
25	0.100	3.863	32	160
					26	0.281	6.685	33	180
27	0.199	2.323	37	100
					28	0.490	7.004	38	180
29	0.270	1.840	39	200
					34	0.174	6.300
35	0.285	5.700
					36	0.454	5.826

In the power divider, the dielectric substrate can be made of Rogers RO4350B with a dielectric constant of 3.48 and a thickness of 0.254mm, and the resistors 31-33 and 37-39 can be 0805 packaged chip resistors. The whole circuit is made in a microstrip line mode and is free from debugging. After the microstrip line is processed, the circuit element is installed in a shielding box body with the thickness of 260 mm multiplied by 72 mm multiplied by 9.4 mm through a printed board and a micro-assembly conductive adhesive pasting process, and then the structure is sealed through a cover plate. The input port of the whole power divider can adopt 1 SMA socket, and the output port can adopt 24 SBMA sockets.

The power divider improves the traditional two-way Wilkinson power dividing circuit, realizes three-way power dividing, and adopts a multi-stage cascade mode to realize 24-way multi-way output. Furthermore, the bandwidth is broadened to 6GHz by a third order impedance transformation. The circuit of the power divider adopts a microstrip line form, has good bandwidth characteristics and higher stability, is free from debugging and is particularly suitable for batch production and application in engineering.

The utility model discloses brief theory of operation as follows:

the signal is divided into 3 paths of signals by equal power through the 1-division-3 power divider, and the signals are respectively input into 3 1-division-2 power dividers which are cascaded subsequently through 3 same output ports; the 3 1-to-2 power dividers divide the input signal into 2 paths of signals in equal power respectively, and then output 6 paths of signals to the 6 1-to-2 power dividers which are cascaded subsequently through two same output ports respectively; then, the 6 1-to-2 power dividers divide the input signal into 2 paths of signals with equal power respectively, and then output 12 paths of signals to the 12 subsequent cascaded 1-to-2 power dividers through two same output ports respectively; finally, 12 1-to-2 power dividers divide the input signal into 2 paths of signals in equal power, output the signals through two same output ports, and finally output 24 paths of signals.

In a word, the utility model discloses can realize 24 way power distributions of ultra wide band of high performance, the cover frequency channel is 3.2GHz ~9.2GHz, bandwidth 6GHz, relative bandwidth 96.8%, can improve communication network's such as switch matrix the passageway rate of reusing.

The utility model discloses the frequency channel that is suitable for is wide, and bandwidth characteristic is good, and stability is higher, and realizes the circuit through the microstrip line, and the tuning position is few, and the debugging is simple. The structure is simple, the volume is small, the integration and the installation are easy, the cost is low, and the device is an important improvement of the prior art.

Claims

1. The ultra-wideband multi-path microwave power divider is characterized by comprising a medium substrate provided with a microstrip circuit, wherein the microstrip circuit comprises a 1-to-3 microstrip line structure and 21 identical 1-to-2 microstrip line structures which form a four-level cascade structure, each 1-to-3 microstrip line structure comprises an input 50-ohm microstrip line and three power dividing branches, each 1-to-2 microstrip line structure comprises an input 50-ohm microstrip line and two power dividing branches, the tail end of each power dividing branch is an output 50-ohm microstrip line, each power dividing branch is divided into a first section of microstrip line, a second section of microstrip line and a third section of microstrip line from the input end to the output end, and signal isolation resistors are bridged at the tail ends of the first section of microstrip line, the second section of microstrip line and the third section of microstrip line between two adjacent power dividing branches in each microstrip line structure.

2. The ultra-wideband multi-path microwave power divider according to claim 1, wherein in the 1-to-3 microstrip line structure, the first microstrip lines on both sides have a length of 6.284mm and a width of 0.100mm, the second microstrip lines on both sides have a length of 6.685mm and a width of 0.281mm, the third microstrip lines on both sides have a length of 7.004mm and a width of 0.490mm, the middle first microstrip line has a length of 3.863mm and a width of 0.100mm, the middle second microstrip line has a length of 2.323mm and a width of 0.199mm, the middle third microstrip line has a length of 1.840mm and a width of 0.270mm, the microstrip line at the end of the first microstrip line has a resistance of 62 ohms, the line at the end of the second microstrip line has a resistance of 160 ohms, and the line at the end of the third microstrip line has a resistance of 180 ohms.

3. The ultra-wideband multi-path microwave power divider according to claim 1, wherein in the 1-to-2 microstrip line structure, the length of the first microstrip line is 6.300mm, the width of the first microstrip line is 0.174mm, the length of the second microstrip line is 5.700mm, the width of the second microstrip line is 0.285mm, the length of the third microstrip line is 5.826mm, the width of the third microstrip line is 0.454mm, the resistance of the signal isolation resistor at the tail end of the first microstrip line is 100 ohms, the resistance of the signal isolation resistor at the tail end of the second microstrip line is 180 ohms, and the resistance of the signal isolation resistor at the tail end of the third microstrip line is 200 ohms.

4. The ultra-wideband multi-path microwave power divider of claim 1, wherein the dielectric substrate has a dielectric constant of 3.48 and a thickness of 0.254 mm.