CN114188690A

CN114188690A - Ultra-wideband multi-path microwave power divider

Info

Publication number: CN114188690A
Application number: CN202111495599.7A
Authority: CN
Inventors: 王崇
Original assignee: CETC 54 Research Institute
Current assignee: CETC 54 Research Institute
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-03-15

Abstract

The invention discloses an ultra-wideband multi-path microwave power divider, and belongs to the technical field of communication. It is composed of 3 1-to-2 power dividers and the like; the signal is subjected to equal-power shunting through the 1-to-2 power divider, and then 2 1-to-2 power dividers are cascaded through a 50-omega strip line, so that 4 paths of equal-power output signals are finally realized. The invention improves the traditional two paths of Wilkinson power dividing circuits, and realizes 4 paths of power division through a stripline circuit; and the relative bandwidth is 157.5% through 4-order impedance transformation; and 4-path multi-path output is realized by adopting a 2-level cascade mode. The invention adopts a strip line form, has good bandwidth characteristic, higher stability, no debugging and compact structure, realizes miniaturization, is easy to integrate and install and is particularly suitable for batch production and application in engineering.

Description

Ultra-wideband multi-path microwave power divider

Technical Field

The invention relates to the technical field of communication, in particular to an ultra-wideband multi-path microwave power divider.

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 are required to be applied, such as a cavity power divider, a strip line power divider, a microstrip line power divider and the like. The waveguide power divider is a power divider with a cavity structure, impedance transformation is realized through a copper rod with the diameter gradually reduced 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. The microstrip line power divider can realize the requirement of narrow relative bandwidth and unable to realize ultra wide band. The strip line power divider is of a planar structure formed by strip lines, has excellent bandwidth performance and small volume, and accords with the development trend of microwave device integration.

Disclosure of Invention

In view of this, the present invention provides an ultra-wideband multi-path microwave power divider. The power divider is wide in applicable frequency band, good in bandwidth characteristic and higher in stability, and a circuit is realized through a strip line without debugging. Simple structure, small volume, easy integration and installation and low cost.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

an ultra-wideband multi-path microwave power divider comprises a primary power divider and two secondary power dividers; the secondary power divider is respectively connected with two output ends of the primary power divider; the power divider is characterized in that the primary power divider and the secondary power divider both comprise 50 omega input strip lines and two power dividing branches which are connected to the tail ends of the 50 omega input strip lines; the power dividing branches comprise a first strip line, a second strip line, a third strip line, a fourth strip line and a 50 omega output strip line which are sequentially connected in series, wherein the head end of the first strip line is connected with the tail end of the 50 omega input strip line;

the primary power divider and the secondary power divider both comprise 4 signal isolation resistors; and signal isolation resistors are bridged at the tail ends of the first strip line, the second strip line, the third strip line and the fourth strip line between the two power dividing branches.

Furthermore, the stripline circuit adopts a Tastic TLY dielectric substrate with the dielectric constant of 2.2 and the thickness of 0.762 mm.

The invention adopts the technical scheme to produce the beneficial effects that:

1. the invention improves the traditional two-path Wilkinson power dividing circuit, realizes 4-path multi-path output in the 0.95 GHz-8 GHz ultra-wide band in a strip line mode, and has full-band amplitude-frequency characteristics less than 0.8dB and random 500MHz amplitude-frequency characteristics less than 0.2 dB; the standing waves of the input and output ports are all less than 1.6; the isolation is greater than 15 dB.

2. The invention improves the traditional two paths of Wilkinson power dividing circuits, and widens the bandwidth to 8GHz through four-order impedance transformation; and 4-path multi-path output is realized by adopting a two-stage cascade mode. The circuit adopts a strip line form, has good bandwidth characteristic and higher stability, is free from debugging and is particularly suitable for batch production and application in engineering.

3. The invention has compact structure and is easy to integrate and install; and the volume is small, 42mm multiplied by 54mm multiplied by 12.6mm, the cost is low, and the method has popularization and application values.

Drawings

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

FIG. 2 is a schematic diagram of the 1-to-2 power divider in FIG. 1

Fig. 3 is an electrical schematic diagram of a power divider of 2-in-1 embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

The ultra-wideband multi-path microwave power divider comprises a 1-2 power divider and 1-2 power dividers 3, and is characterized in that the 1-2 power dividers and the 1-2 power dividers 3 are completely identical, each 1-2 power divider is provided with an input port and two output ports, and an input signal is divided into two paths of signals in an equal-power mode; the 1-division-2 power divider 1 is a primary power divider, the 1-division-2 power divider 2 and the 1-division-2 power divider 3 are secondary power dividers, and the two secondary power dividers are connected with two output ports of the primary power divider in a one-to-one correspondence manner. The 1-to-2 power divider comprises a 50-omega input strip line and two power dividing branches. Each power dividing branch comprises a first strip line, a second strip line, a third strip line, a fourth strip line and a 50 omega output strip line which are sequentially connected in series. And signal isolation resistors are bridged at the tail ends of the first strip line, the second strip line, the third strip line and the fourth strip line between two adjacent power dividing branches in each power divider. The whole stripline circuit adopts a TaconicTLY dielectric substrate with the dielectric constant of 2.2 and the thickness of 0.762mm, the width, the length and the isolation resistance of four sections of striplines are analyzed in a tuning mode, the influence of each parameter on indexes such as return loss, amplitude-frequency characteristics and the like of the circuit at the high end and the low end of a frequency band is summarized, and then the specific size of each section of stripline is obtained by performing targeted parameter optimization on each index.

In view of 4 paths of power division, the present embodiment is implemented by cascading 3 1/2 power dividers. Because of the ultra-wide band, if the traditional wilkinson technology is adopted, 7-order impedance transformation is needed for cascading, and the size is too large to meet engineering requirements. The strip line has the advantages of good microwave performance and wide bandwidth, so the width and the length of each section of the strip line in the 4-order strip line 1-to-2 power divider are deduced through the traditional Wilkinson technical theory, simulation optimization is carried out by utilizing microwave simulation software Ansoft design, and the specific actual size of the strip line power divider and the resistance value of the isolation resistor are finally determined, and the specific size and the resistance value are detailed in Table 1.

TABLE 1

And finally, cascading 3 1-to-2 power dividers through a 50-ohm strip line, and connecting the power dividers with isolation resistors to realize 4-path power dividers. Comprises a 1-2-in-1-in-2-in-3-in-1-in-2-in-1-in-2-in-one-out power divider. Is characterized in that the 1-to-2 power divider 1-to-2 power divider 3 is identical, and the 1-to-2 power divider 1-to-2 power divider 3 comprises a 50 omega strip line 1, a 50 omega strip line 10, a 50 omega strip line 11, a strip line 2-9, and resistors 1-4. The signal is divided into 2 paths of signals by equal power through a 1-to-2 power divider 1, and the signals are respectively input into the 1-to-2 power divider 2 and the 1-to-2 power divider 3 through 2 identical output ports 2 and 3; the 1-to-2 power divider 2 and the 1-to-2 power divider 3 divide the input signal into 4 paths of signals with equal power respectively for final output.

The 1-to-2 power divider 1-to-2 power divider 3 comprises a 50 omega strip line 1, a 50 omega strip line 10, a 50 omega strip line 11, a strip line 2-to-strip line 9, and resistors 1-to-4. After passing through a 50 omega strip line 1, the signal is divided into 2 paths with equal power, and the 2 paths are respectively output through a 4-order strip line 2-strip line 9, a 50 omega strip line 10 and a 50 omega strip line 11, wherein a resistor 1-a resistor 4 are used for signal isolation.

Referring to fig. 1 to 3, the present embodiment is composed of a 1/2 power divider 1 to a 1/2 power divider 3. Fig. 1 is a schematic block diagram of an embodiment of the present invention, which connects lines according to fig. 1, and connects power dividers of each part by using a 50 Ω strip line. Wherein, the 1-to-2 power divider 1-to-2 power divider 3 is composed of strip lines.

In this embodiment, the core circuit 1 includes a 2-division power divider 1, and the 1-division 2-division power divider 3 includes a 50 Ω strip line 1, a 50 Ω strip line 10, a 50 Ω strip line 11, strip lines 2 to 9, and resistors 1 to 4, respectively. Fig. 2 is an electrical schematic diagram of a circuit of a 1-2-by-1 power divider 3 according to the present invention, in which an embodiment is connected to the circuit according to fig. 2, fig. 3 is an electrical schematic diagram of a circuit of a 1-2-by-1 power divider 3 according to the present invention, in which an embodiment is connected to the circuit according to fig. 3. The dielectric substrate is made of Taconic TLY, and the resistors 1-4 play a role in isolating signals. Example resistors 1-4 were packaged in 0603. The whole circuit is manufactured in a strip line mode, debugging is avoided, and the circuit can be used after being assembled after being processed.

The invention has the following brief working principle: the signal is divided into 2 paths of signals by equal power through a 1-in-2 power divider 1, and the signals are respectively input into the 1-in-2 power divider 2 and the 1-in-2 power divider 3 through 2 same output ports 2 and 3; the 1-to-2 power divider 2 and the 1-to-2 power divider 3 divide the input signal into 4 paths of signals with equal power respectively for final output.

The mounting structure of the invention is as follows: after the circuit element in the figure 1 is processed by a printed board process, the circuit element is arranged in a shielding box body with the thickness of 42mm multiplied by 54mm multiplied by 12.6mm through a fixing screw. The input port A adopts 1 SMA socket, and the output port B adopts 4 SMA sockets to connect, thus the assembly is simple and the cost is low.

Claims

1. An ultra-wideband multi-path microwave power divider comprises a primary power divider and two secondary power dividers; the secondary power divider is respectively connected with two output ends of the primary power divider; the power divider is characterized in that the primary power divider and the secondary power divider both comprise 50 omega input strip lines and two power dividing branches which are connected to the tail ends of the 50 omega input strip lines; the power dividing branches comprise a first strip line, a second strip line, a third strip line, a fourth strip line and a 50 omega output strip line which are sequentially connected in series, wherein the head end of the first strip line is connected with the tail end of the 50 omega input strip line;

the primary power divider and the secondary power divider both comprise 4 signal isolation resistors; and corresponding signal isolation resistors are bridged at the tail ends of the first strip line, the second strip line, the third strip line and the fourth strip line between the two power dividing branches.

2. The ultra-wideband multi-path microwave power divider as claimed in claim 1, wherein the stripline circuit employs a Taconic TLY dielectric substrate with a dielectric constant of 2.2 and a thickness of 0.762 mm.