CN103594770B - Passive double-frequency six-port device - Google Patents

Abstract

The invention discloses a kind of passive double-frequency six-port device, including double-frequency Wilkinson power divider (A), its first port (a1) is as first port (Port1) of passive double-frequency six-port device；First double frequency branch line coupler (B), its first port (b1) is as second port (Port2) of described passive double-frequency six-port device；Second double frequency branch line coupler (C), the first port (c1) and the 4th port (c4) are respectively as the 4th port (Port4) of described passive double-frequency six-port device and the 6th port (Port6)；And the 3rd double frequency branch line coupler (D), the first port (d1) and the 4th port (d4) are respectively as the fifth port (Port5) of described passive double-frequency six-port device and the 3rd port (Port3)；Described first port (Port1) and the second port (Port2) are input port, and described 3rd port (Port3), the 4th port (Port4), fifth port (Port5) and the 6th port (Port6) are output port.Pass through the present invention, it is achieved that two operating frequency (f of passive double-frequency six-port device₁、f₂) can freely determine, and the phase contrast between four output ports is identical at two operating frequency points.

Description

Passive double-frequency six-port device

Technical field

The invention belongs to microwave passive component field, particularly, relate to a kind of passive double-frequency six-port device.

Background technology

Six-port waveguide parts is widely used in radar, Direct Digital receiver, and microwave and millimeter wave is measured and Network Analyzer Deng in field.1972, NBS Hoer et al. proposed the concept of six-port circuit and it is used for Microwave Net Analyzing, the microwave branch-off element that they utilize directional coupler and power divider etc. to have property forms six port electricity Road, and signal source and load are accessed two ports in 6 ports, found that by measuring the merit on 4 output ports Rate, just can obtain amplitude and the phase information of reflection coefficient.This circuit structure is simple, and cost is low, the most also has many merits The advantages such as energy, wide-band, high accuracy and high speed.

Along with the development of radio communication, the application of double frequency device is more and more extensive, many wireless communication standards based on The frequency range of two or more, such as global system for mobile communications (GSM) are applied at 0.9GHz, 1.8GHz and 1.9GHz etc., double Frequently characteristic can reduce the number of component greatly thus reduce cost, and therefore research double frequency six-port circuit has great Meaning.

Traditional six-port circuit is mainly by spies such as 3dB directional coupler, evil spirit T class hybrid juction and in the same direction decile power splitters Different microwave component composition.And the method that the double frequency six-port circuit that presently, there are mainly uses compound left and right transmission line sets Meter, but when this six-port circuit based on left-and-right-hand transmission line is applied to double frequency environment, can cause four output ports it Between phase contrast two operating frequency differences, and then have impact on the application under double frequency environment of this six-port circuit, and left and right Hands transmission line makes complexity, is difficult to realize.

Summary of the invention

(1) to solve the technical problem that

In view of above-mentioned technical problem, the invention provides one double-frequency Wilkinson power divider of a kind of employing and three double frequencies The passive double-frequency six-port device of branch line coupler composition, to realize the phase contrast phase at two operating frequency output ports With, compact conformation, it is easy to integrated.

(2) technical scheme

According to an aspect of the invention, it is provided a kind of passive double-frequency six-port device, it is characterised in that including: double Frequently Wilkinson power divider A, its first port a1 is as the first port Port1 of passive double-frequency six-port device；First double frequency Branch line coupler B, its first port b1 is as the second port Port2 of described passive double-frequency six-port device, the 4th port B4 is connected to ground by 50 Ω loads；Second double frequency branch line coupler C, its second port c2 are connected to described double frequency Weir gold The second port a2 of gloomy power splitter A, the 3rd port c3 are connected to the second port b2 of described first double frequency branch line coupler B, First port c1 and the 4th port c4 is respectively as the 4th port Port4 of described passive double-frequency six-port device and the 6th port Port6；3rd double frequency branch line coupler D, its second port d2 are connected to the 3rd end of described double-frequency Wilkinson power divider A Mouth a3, the 3rd port d3 are connected to the 3rd port b3 of described first double frequency branch line coupler B, the first port d1 and the 4th end Mouthful d4 is respectively as fifth port Port5 of described passive double-frequency six-port device and the 3rd port Port3；Described passive double-frequency In Six-port waveguide parts, described first port Port1 and the second port Port2 is input port, described 3rd port Port3, Four port Port4, fifth port Port5 and the 6th port Port6 are output port.

Wherein, described double-frequency Wilkinson power divider A includes: the first couple of coupling line cl being set parallel to each other₁, its left end Be connected to each other the first port a1 as double-frequency Wilkinson power divider A；First isolation resistance R₁, it is connected to described first pair of coupling Between the right output port of zygonema；The second couple of coupling line cl being set parallel to each other₂, its left end level is coupled to the right side of first pair of coupling line End, its right-hand member is respectively as the second port a2 and the 3rd port a3 of double-frequency Wilkinson power divider A；And second isolation resistance R₂, it is connected between the right output port of described second pair of coupling line.

Wherein, described first couple of coupling line cl₁Left end be connected to a lead-in wire l₀, to form double-frequency Wilkinson power divider A The first port a1；And described second couple of coupling line cl₂Right-hand member be connected respectively to another lead-in wire l₀, to form double frequency respectively The second port a2 of Wilkinson power divider A and the 3rd port a3.

Further, the parameter in described double-frequency Wilkinson power divider A meets following condition:

$Z_{e1}=Z_o\sqrt{\frac{\sqrt{1+8{\tan }^4{\mathrm{\θ}}_1}-1}{{\tan }^2{\mathrm{\θ}}_1}},$

$Z_{e2}=Z_o\sqrt{\frac{\sqrt{1+8{\tan }^4{\mathrm{\θ}}_1}+1}{2{\tan }^2{\mathrm{\θ}}_1}},$

$R_1=\frac{2Z_{o1}{Z}_{o2}{\tan }^2{\mathrm{\θ}}_1}{\sqrt{(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1(Z_{o1}{\tan }^2{\mathrm{\θ}}_1-Z_{o2})}},$

$R_2=\frac{2Z_o{Z}_{o2}^2(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1+2Z_o^2{Z}_{o2}\sqrt{(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1(Z_{o1}{\tan }^2{\mathrm{\θ}}_1-Z_{o2})}}{Z_o^2{Z}_{o2}+(Z_{o1}{Z}_{o2}^2-Z_o^2{Z}_{o1}+Z_{o2}^3){\tan }^2{\mathrm{\θ}}_1},$

Wherein, f₁And f₂It is respectively two operating frequencies, Z_e1For the even modular character impedance of described first pair of coupling line, Z_e2For The even modular character impedance of described second pair of coupling line, R₁,R₂For described first isolation resistance and the resistance of the second isolation resistance, Z_o For lead-in wire l₀Characteristic impedance, θ₁It is first pair of coupling line and the electrical length of second pair of coupling line, Z_o1,Z_o2It is respectively first pair of coupling Zygonema and the strange modular character impedance of second pair of coupling line.

Preferably, the parameter in described double-frequency Wilkinson power divider A meets following condition: Z further_o1＜ Z_e1＜ 1.5Z_o1, Z_o2＜ Z_e2＜ 1.5Z_o2；

20 Ω ＜ Z_e1, Z_e2＜ 150 Ω, 20 Ω ＜ Z_o1, Z_o2＜ 120 Ω；And

Z_o=50 Ω.

Wherein, described first double frequency branch line coupler B, the second double frequency branch line coupler C and the 3rd double frequency branch line Bonder D is for having mutually isostructural double frequency branch line coupler, and each described double frequency branch line coupler includes: branch line coupling Clutch l₂, l₃, 4 ports at this branch line coupler cascade the first double frequency impedance matching microstrip line l of connection respectively_a, second Double frequency impedance matching microstrip line l_bAnd lead-in wire l₀。

Wherein, described branch line coupler includes the first couple of microstrip line l be arrangeding in parallel in the first direction₂, along with first Second couple of microstrip line l that the vertical second direction in direction be arranged in parallel₃；Described lead-in wire l₀It is connected to the second double frequency of each port Impedance matching microstrip line l_bOn, form 4 ports of each double frequency branch line coupler.

Further, the parameter of each described double frequency branch line coupler meets following condition:

$Z_2=\sqrt{2}{Z}_3,$

$Z_a=\frac{-H\±\sqrt{H^2-4FK}}{2F},$

$Z_b=-\frac{B}{4A}+\frac{1}{2}\sqrt{(\frac{B^2}{4A^2}-\frac{2C}{3A}+{\mathrm{\Δ}}_1+{\mathrm{\Δ}}_2)}+\frac{1}{2}\sqrt{(\frac{B^2}{2A^2}-\frac{4C}{3A}-{\mathrm{\Δ}}_1-{\mathrm{\Δ}}_2+\frac{4ABC-B^3-8A^{2}D}{4A^3\sqrt{(\frac{B^2}{4A^2}-\frac{2C}{3A}+{\mathrm{\Δ}}_1+{\mathrm{\Δ}}_2)}})},$

$R_{in}=\frac{\sqrt{(Z_2^2-Z_3^2)Z_2^2{Z}_3^2{\sin }^2\left(\mathrm{\θ}\right)}}{(Z_2+Z_3)\[Z_2-Z_3+(Z_2+Z_3){\cos }^2\left(\mathrm{\θ}\right)\]},$

$X_{in}=\frac{(Z_2+Z_3)Z_2{Z}_{3}cos\left(\mathrm{\θ}\right)sin\left(\mathrm{\θ}\right)}{(Z_2+Z_3)\[Z_2-Z_3+(Z_2+Z_3){\cos }^2\left(\mathrm{\θ}\right)\]},$

A=R_in(Z_o-R_in)tan²(θ),

B=2Z_oR_inX_in tan³(θ),

$C=(R_{in}-Z_o)(Z_o{R}_{in}^2+Z_o{X}_{in}^2-Z_o^2{R}_{in})-\[2+{\tan }^2\left(\mathrm{\θ}\right)\]{\tan }^2\left(\mathrm{\θ}\right)Z_o^2{X}_{in}^2,$

$D=-2Z_o^3{R}_{in}{X}_{in}{\tan }^3\left(\mathrm{\θ}\right),$

$E=Z_o^3{R}_{in}(R_{in}^2+X_{in}^2-Z_o{R}_{in}){\tan }^2\left(\mathrm{\θ}\right),$

F=-Z_o tan²(θ),

H=(Z_o-R_in)Z_b-Z_oX_inTan (θ),

$K=R_{in}{Z}_b^2{\tan }^2\left(\mathrm{\θ}\right)-Z_o{X}_{in}{Z}_{b}tan\left(\mathrm{\θ}\right),$

${\mathrm{\Δ}}_1=\left(\begin{array}{c}\frac{\sqrt[3]{2}(C^2-3BD+12AE)}{3A\[2C^3-9BCD+27{\mathrm{AD}}^2+27B^{2}E-72ACE}\\ +\sqrt{-4{(C^2-3BD+12AE)}^3+{(2C^3-9BCD+27{\mathrm{AD}}^2+27B^{2}E-72ACE)}^2}{\]}^{1/3}\end{array}\right),$

${\mathrm{\Δ}}_2=\frac{(C^2-3BD+12AE)}{{\mathrm{\Δ}}_1{\left(AB\right)}^2},$

Wherein, Z₂,Z₃It is respectively first couple of microstrip line l₂With second couple of microstrip line l₃Characteristic impedance, Z_a,Z_bIt is respectively every First double frequency impedance matching microstrip line l of individual port_aWith the second double frequency impedance matching microstrip line l_bCharacteristic impedance, Z_oFor lead-in wire l₀Characteristic impedance, θ is the electrical length of above-mentioned all microstrip lines.

Preferably, the characteristic impedance Z of above-mentioned all microstrip lines_iMeet: 20 Ω ＜ Z_i＜ 120 Ω, wherein i=a, b, 2,3.

Preferably, the parameter of described passive double-frequency six-port device meets following condition:

Z_e1=81.5769 Ω, Z_o1=43.3340 Ω, Z_e2=61.2918 Ω,

Z_o2=40.1384 Ω, R₁=63.0738 Ω, R₂=565.1966 Ω,

Z_a=41.5501 Ω, Z_b=74.7131 Ω, Z₂=42.4264 Ω,

Z₃=30 Ω, θ₁=θ=90 °,

Two operating frequencies of passive double-frequency six-port device are respectively f₁=3GHz, f₂=5GHz.

(3) beneficial effect

From technique scheme it can be seen that passive double-frequency six-port device of the present invention has the advantages that (1) leads to Cross a double-frequency Wilkinson power divider and three double frequency branch line couplers, it is achieved that passive double-frequency six-port device two Operating frequency (f₁、f₂) can freely determine, and the phase contrast between four output ports is identical two operating frequencies；(2) adopt By the double-frequency Wilkinson power divider of coupling microstrip line structure, the double frequency branch line coupler of microstrip line construction and three resistances Different Chip-R, it is achieved that miniaturization, the passive double-frequency six-port device of compact conformation, it is easy to monolithic microwave integrated technology (MMIC) carry out integrated.

Accompanying drawing explanation

Fig. 1 shows the overall structure block diagram of passive double-frequency six-port device according to an exemplary embodiment of the present invention；

Fig. 2 be the present invention passive double-frequency six-port device in the equivalent circuit theory figure of Wilkinson power divider；

Fig. 3 is the planar structure schematic diagram of Wilkinson power divider shown in Fig. 2；

Fig. 4 be the present invention passive double-frequency six-port device in the equivalent circuit theory figure of double frequency branch line coupler；

Fig. 5 is the planar structure schematic diagram of double frequency branch line coupler shown in Fig. 4；

Fig. 6 A～the ideal model simulation result figure that Fig. 6 C is passive double-frequency six-port device of the present invention；

Fig. 7 A～the physical model simulation result figure of passive double-frequency six-port device that Fig. 7 C is the preferred embodiment of the present invention.

Detailed description of the invention

For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference Accompanying drawing, the present invention is described in more detail.It should be noted that in accompanying drawing or description describe, similar or identical portion Divide and all use identical figure number.The implementation not illustrated in accompanying drawing or describe, for those of ordinary skill in art Known form.Although it addition, can provide herein the demonstration of the parameter comprising particular value, it is to be understood that parameter is without definite etc. In corresponding value, but can be similar to be worth accordingly in acceptable error margin or design constraint.

The passive double-frequency six-port device that the present invention provides uses printed circuit board (PCB) to form the plane six of planar microstrip form Port circuit, is formed by a double-frequency Wilkinson power divider and three double frequency branch line coupler combinations, further, uses strange Even mould analytic process parses the analytic solutions of described power splitter and bonder so that it is can be operated in arbitrary two Frequency point f₁With f₂。

In one exemplary embodiment of the present invention, it is provided that a kind of passive double-frequency six-port device.Fig. 1 shows root Overall structure block diagram according to the passive double-frequency six-port device of exemplary embodiment of the present.

With reference to Fig. 1, the passive double-frequency six-port device of the present embodiment is formed on dielectric-slab, including double frequency Wilkinson merit Divide device A, the first double frequency branch line coupler B, the second double frequency branch line coupler C and the 3rd double frequency branch line coupler D.

The first port a1 of double-frequency Wilkinson power divider A is input port, and as passive pair of the embodiment of the present invention Frequently the first port Port1 of Six-port waveguide parts；Double-frequency Wilkinson power divider A the second port a2 and the 3rd port a3 is outfan Mouthful, it is connected respectively to second port c2 and d2 of double frequency branch line coupler C, D.

The first port b1 of the first double frequency branch line coupler B is as the second port of passive double-frequency six-port device Port2, the 4th port b4 are connected to ground, the second port b2 of the first double frequency branch line coupler B by the ohmic load of 50 Ω With the 3rd port c3 and d3 that the 3rd port b3 is connected respectively to double frequency branch line coupler C, D.

The second port c2 of the second double frequency branch line coupler C is connected to second port of double-frequency Wilkinson power divider A A2, its 3rd port c3 are connected to the second port b2 of the first double frequency branch line coupler B, its first port c1 and the 4th port C4 is respectively as the 4th port Port4 and the 6th port Port6 of passive double-frequency six-port device；

The second port d2 of the 3rd double frequency branch line coupler D is connected to the 3rd port of double-frequency Wilkinson power divider A A3, the 3rd port d3 are connected to the 3rd port b3 of the first double frequency branch line coupler B, its first port d1 and the 4th port d4 Fifth port Port5 and the 3rd port Port3 respectively as passive double-frequency six-port device.

In above-mentioned passive double-frequency six-port device, the first port Port1 and the second port Port2 is input port, the 3rd Port Port3, the 4th port Port4, fifth port Port5 and the 6th port Port6 are output port.

In the present embodiment, double-frequency Wilkinson power divider A uses coupled line structure (referring to Fig. 2, Fig. 3).First double frequency divides Branch-line coupler B, the second double frequency branch line coupler C and the 3rd double frequency branch line coupler D circuit structure are identical, all use micro- Strip line structure (refers to Fig. 4, Fig. 5), preferably uses 3dB double frequency branch line coupler.Thus, by double-frequency Wilkinson power divider The passive double-frequency six-port device that A and three double frequency branch line coupler B, C, D-shaped become achieve miniaturization, the six of compact conformation Port planar circuit, it is easy to monolithic microwave integrated technology (MMIC) carries out integrated.

Below, respectively each ingredient in the passive double-frequency six-port device of the preferred embodiment of the present invention is carried out in detail Explanation.

In the present embodiment, dielectric-slab uses Common radio frequency microwave sheet material, it is not necessary to the high-k plate that price is high Material, batch production cost is the lowest.

Fig. 2 be the present invention passive double-frequency six-port device in the equivalent circuit theory figure of Wilkinson power divider.Fig. 3 is The planar structure schematic diagram of Wilkinson power divider shown in Fig. 2.

With reference to Fig. 2 and Fig. 3, in the passive double-frequency six-port device of the embodiment of the present invention, double-frequency Wilkinson power divider A bag Include: first couple of coupling line cl₁, the first isolation resistance R₁, second couple of coupling line cl₂And the second isolation resistance R₂, three ports are equal Characteristic impedance 50 Ω for standard.

Further, see Fig. 3, first couple of coupling line cl₁Parallel to each other, its left end is connected and terminates lead-in wire l₀As The first port a1 of double-frequency Wilkinson power divider A, namely the first port Port1 of passive double-frequency six-port device.Lead-in wire l₀ A length of l₀, width is w₀.First couple of coupling line cl₁Spacing be cs₁, the width of every coupling line is cw₁, a length of cl₁。 Here, port pins l₀Effect be that the measuring instrument facilitating port standard to be 50 Ω is measured, and facilitate power splitter and coupling Connection between device, meets matching condition.The termination lead-in wire l arranged with lower port₀Act on identical.

First isolation resistance R₁It is connected between the right-hand member of first pair of coupling line.

Second couple of coupling line cl₂Parallel to each other, its left end level is coupled to right-hand member (the i.e. second pair coupling line of first pair of coupling line cl₂The left end of each be connected to the right-hand member of each of first pair of coupling line).Second couple of coupling line cl₂Right-hand member hold respectively Meet lead-in wire l₀The second port a2 and the 3rd port a3 as double-frequency Wilkinson power divider A.Lead-in wire l₀A length of l₀, width For w₀.Second couple of coupling line cl₂Spacing be cs₂, the width of every coupling line is cw₂, a length of cl₂。

Second isolation resistance R₂It is connected to second couple of coupling line cl₂Right-hand member between.

Export in the same direction and two operating frequencies can arbitrarily be arranged to realize Dual frequency power decile, double shown in Fig. 2 and Fig. 3 Frequently the parameters in Wilkinson power divider meets following condition:

$Z_{e1}=Z_o\sqrt{\frac{\sqrt{1+8{\tan }^4{\mathrm{\θ}}_1}-1}{{\tan }^2{\mathrm{\θ}}_1}}---\left(1\right)$

$Z_{e2}=Z_o\sqrt{\frac{\sqrt{1+8{\tan }^4{\mathrm{\θ}}_1}+1}{2{\tan }^2{\mathrm{\θ}}_1}}---\left(2\right)$

$R_1=\frac{2Z_{o1}{Z}_{o2}{\tan }^2{\mathrm{\θ}}_1}{\sqrt{(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1(Z_{o1}{\tan }^2{\mathrm{\θ}}_1-Z_{o2})}}---\left(3\right)$

$R_2=\frac{2Z_o{Z}_{o2}^2(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1+2Z_o^2{Z}_{o2}\sqrt{(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1(Z_{o1}{\tan }^2{\mathrm{\θ}}_1-Z_{o2})}}{Z_o^2{Z}_{o2}+(Z_{o1}{Z}_{o2}^2-Z_o^2{Z}_{o1}+Z_{o2}^3){\tan }^2{\mathrm{\θ}}_1}---\left(4\right)$

Wherein, f₁And f₂It is respectively two operating frequencies, g=f₂/f₁For frequency ratio, Z_e1It it is the even mould of first pair of coupling line Characteristic impedance, Z_e2It is the even modular character impedance of second pair of coupling line, R₁,R₂It is the first isolation resistance and the resistance of the second isolation resistance Value, Z_oFor lead-in wire l₀Characteristic impedance, preferably 50 ohmages of standard, θ₁It is the electrical length of two pairs of coupling lines, Z_o1,Z_o2For The strange modular character impedance of independent variable, respectively first pair coupling line and second pair of coupling line, generally meets Z_o1＜ Z_e1＜ 1.5Z_o,₁Z_o2＜ Z_e2＜ 1.5Z_o2Condition.In the range of microstrip line can realize, 20 Ω ＜ Z can be taken_e1, Z_e2＜ 150 Ω, 20 Ω ＜ Z_o1, Z_o2＜ 120 Ω.

In embodiments of the invention, first pair of coupling line and second pair of coupling line all use coupled line structure, and first Isolation resistance R₁With the second isolation resistance R₂Use the form of Chip-R.Coupled line structure and Chip-R structure is used to make this The circuit structure of double-frequency Wilkinson power divider A is compacter.

In the present embodiment, the first double frequency branch line coupler B, the second double frequency branch line coupler C and the 3rd double frequency branch Line bonder D is for having mutually isostructural double frequency branch line coupler, and all of the port is characteristic impedance 50 Ω of standard.

Fig. 4 be the present invention passive double-frequency six-port device in the equivalent circuit theory figure of double frequency branch line coupler.Fig. 5 Planar structure schematic diagram for double frequency branch line coupler shown in Fig. 4.

With reference to Fig. 4 and Fig. 5, in embodiments of the invention, double frequency branch line coupler B, C, D have identical structure, under Face is introduced as a example by the first double frequency branch line coupler B, specifically includes branch line coupler and at branch line coupler 4 ports each cascade connect the first double frequency impedance matching microstrip line l_a, the second double frequency impedance matching microstrip line l_bWith And lead-in wire l₀。

Branch line coupler, including the first couple of microstrip line l be arrangeding in parallel in the first direction₂, along vertical with first direction Second couple of microstrip line l be arrangeding in parallel of second direction₃.As it is shown in figure 5, first couple of microstrip line l₂A length of l₂, width is w₂, second couple of microstrip line l₃A length of l₃, width is w₃.First couple of microstrip line l₂With second couple of microstrip line l₃The company of cascading with one another Connect, form the branch line coupler of square structure.

Further, as shown in Figure 4 and Figure 5,4 ports of branch line coupler are connected to the first double frequency of cascade Impedance matching microstrip line l_aWith the second double frequency impedance matching microstrip line l_b.Microstrip line l_aA length of l_a, width is w_a, microstrip line l_b A length of l_b, width is w_b。

Further, the second double frequency impedance matching microstrip line l of each port_bIt is all connected to a lead-in wire l₀, go between l₀Also Be formed as microstrip line, its a length of l₀, width is w₀.Lead-in wire l₀Parallel the second double frequency impedance matching being connected to each port Microstrip line l_bOn, form 4 ports b1, b2, b3 and b4 of the first double frequency branch line coupler B.

See Fig. 4, first couple of microstrip line l₂Characteristic impedance be Z₂, second couple of microstrip line l₃Characteristic impedance be Z₃, first Double frequency impedance matching microstrip line l_aCharacteristic impedance be Z_a, the second double frequency impedance matching microstrip line l_bCharacteristic impedance be Z_b, lead-in wire l₀Characteristic impedance be Z₀, the electrical length of above-mentioned all microstrip lines is θ.

Branch line coupler is by first couple of microstrip line l perpendicular to one another₂With second couple of microstrip line l₃Form traditional 3dB to divide Branch-line coupler, its four ports cascade connection the first double frequency impedance matching microstrip line l respectively_aMicro-with the second double frequency impedance matching Band wire l_b.Overall structure is symmetrical above and below, symmetrical, it is achieved that Dual frequency power decile, 90 degree of phase contrast outputs and two work The arbitrary branch line coupler of frequency.Coupled line structure and Chip-R structure is used to make the circuit structure of this branch line coupler Compacter.

In order to realize the second output port and the 3rd output port (the such as first double frequency branch line coupling of branch line coupler Port b2 and b3 of clutch B, other double frequencies branch line coupler C, D are similar) constant amplitude, there are 90 degree of phase contrasts and can be operated in Two optional frequencies, parameters in the branch line coupler shown in Fig. 4 and Fig. 5 it suffices that:

$Z_2=\sqrt{2}{Z}_3---\left(5\right)$

$Z_a=\frac{-H\±\sqrt{H^2-4FK}}{2F}---\left(6\right)$

$Z_b=-\frac{B}{4A}+\frac{1}{2}\sqrt{(\frac{B^2}{4A^2}-\frac{2C}{3A}+{\mathrm{\Δ}}_1+{\mathrm{\Δ}}_2)}+\frac{1}{2}\sqrt{(\frac{B^2}{2A^2}-\frac{4C}{3A}{\mathrm{\Δ}}_1{\mathrm{\Δ}}_2+\frac{4ABC-B^3-8A^{2}D}{4A^3\sqrt{(\frac{B^2}{4A^2}-\frac{2C}{3A}+{\mathrm{\Δ}}_1+{\mathrm{\Δ}}_2)}})}---\left(7\right)$

Wherein:

$R_{in}=\frac{\sqrt{(Z_2^2-Z_3^2)Z_2^2{Z}_3^2{\sin }^2\left(\mathrm{\θ}\right)}}{(Z_2+Z_3)\[Z_2-Z_3+(Z_2+Z_3){\cos }^2\left(\mathrm{\θ}\right)\]}---\left(8\right)$

$X_{in}=\frac{(Z_2+Z_3)Z_2{Z}_{3}cos\left(\mathrm{\θ}\right)sin\left(\mathrm{\θ}\right)}{(Z_2+Z_3)\[Z_2-Z_3+(Z_2+Z_3){\cos }^2\left(\mathrm{\θ}\right)\]}---\left(9\right)$

A=R_in(Z_o-R_in)tan²(θ) (10)

B=2Z_oR_inX_in tan³(θ) (11)

$C=(R_{in}-Z_o)(Z_o{R}_{in}^2+Z_o{X}_{in}^2-Z_o^2{R}_{in})-\[2+{\tan }^2\left(\mathrm{\θ}\right)\]{\tan }^2\left(\mathrm{\θ}\right)Z_o^2{X}_{in}^2---\left(12\right)$

$D=-2Z_o^3{R}_{in}{X}_{in}{\tan }^3\left(\mathrm{\θ}\right)---\left(13\right)$

$E=Z_o^3{R}_{in}(R_{in}^2+X_{in}^2-Z_o{R}_{in}){\tan }^2\left(\mathrm{\θ}\right)---\left(14\right)$

F=-Z_o tan²(θ) (15)

H=(Z_o-R_in)Z_b-Z_oX_in tan(θ) (16)

$K=R_{in}{Z}_b^2{\tan }^2\left(\mathrm{\θ}\right)-Z_o{X}_{in}{Z}_{b}tan\left(\mathrm{\θ}\right)---\left(17\right)$

${\mathrm{\Δ}}_1=\left(\begin{array}{c}\frac{\sqrt[3]{2}(C^2-3BD+12AE)}{3A\[2C^3-9BCD+27{\mathrm{AD}}^2+27B^{2}E-72ACE}\\ +\sqrt{-4{(C^2-3BD+12AE)}^3+{(2C^3-9BCD+27{\mathrm{AD}}^2+27B^{2}E-72ACE)}^2}{\]}^{1/3}\end{array}\right)---\left(18\right)$

${\mathrm{\Δ}}_2=\frac{(C^2-3BD+12AE)}{{\mathrm{\Δ}}_1{\left(3A\right)}^2}---\left(19\right)$

Wherein, Z₂,Z₃It is respectively first couple of microstrip line l₂With second couple of microstrip line l₃Characteristic impedance, Z_a,Z_bIt is respectively every First double frequency impedance matching microstrip line l of individual port_aWith the second double frequency impedance matching microstrip line l_bCharacteristic impedance, Z_oFor lead-in wire l₀Characteristic impedance, usually 50 ohmages of standard, θ is microstrip line l₂、l₃、l_a、l_bElectrical length, Z₃For independent variable. In the range of microstrip line can realize, take 20 Ω ＜ Z_i＜ 120 Ω (wherein i=a, b, 2,3).

Refer to Fig. 1, in the present embodiment, the 4th port b4 of the first double frequency branch line coupler B connects 50 ohm load.The Two double frequency branch line coupler C and four output ports of the 3rd double frequency branch line coupler D, the most whole passive double-frequency six port 3rd port Port3, the 4th port Port4, fifth port Port5 and the 6th port Port6 of device all can connect diode Power detection meter thus test its output.

As it has been described above, passive double-frequency six-port device according to embodiments of the present invention, odd-even mode analytical method is used to parse Power splitter and the analytic solutions of bonder so that it is arbitrary two Frequency point (f can be operated in₁、f₂).Further, use plane micro- The form of band wire realizes this device, thus overcomes left-and-right-hand transmission line phase contrast phase of output port in two operating frequencies Anti-shortcoming.

A preferred embodiment of of the present invention passive double-frequency six-port device is described below.Described preferred embodiment is basis Based on said structure and theoretical calculation formula, tested by Multi simulation running, obtain after being then passed through repeatedly actual measurement and debugging Arrive, represent a preferred embodiment of the passive double-frequency six-port device of the present invention, but be not construed as the limit to the present invention System, every example meeting described formula all should be at the row of protection domain.

The parameter of the passive double-frequency six-port device of the preferred embodiment of the present invention is as follows: Z_e1=81.5769 Ω, Z_o1= 43.3340 Ω, Z_e2=61.2918 Ω, Z_o2=40.1384 Ω, R₁=63.0738 Ω, R₂=565.1966 Ω, Z_a= 41.5501 Ω, Z_b=74.7131 Ω.Z₂=42.4264 Ω, Z₃=30 Ω, θ₁=θ=90 ° (f₀=4GHz).Now, passive double Frequently two operating frequencies of Six-port waveguide parts are respectively f₁=3GHz, f₂=5GHz.

For the Wilkinson power divider shown in Fig. 3 and Fig. 5 and the device architecture of branch line coupler, based on being relatively situated between Electric constant is 3.48, and thickness is that Rogers's R04350B sheet material of 0.762mm calculates instrument by use microstrip line, can obtain The parameter of side circuit: w₀=2.73mm, l₀=10mm, cw₁=1.26mm, cs₁=0.42mm, cl₁=11.98mm, cw₂= 1.94mm, cs₂=0.63mm, cl₂=11.61mm, w_a=3.01mm, l_a=11.12mm w_b=1.10mm, l_b=11.58mm, w₂=2.92mm, l₂=11.13mm, w₃=4.75mm, l₃=10.89mm.

Fig. 6 A～the ideal model simulation result figure that Fig. 6 C is passive double-frequency six-port device of the present invention.Fig. 7 A～Fig. 7 C is The physical model simulation result figure of the passive double-frequency six-port device of the preferred embodiment of the present invention.Comparison diagram 6A and Fig. 7 A can see Arriving, the passive double-frequency six-port device of preferred embodiment of the present invention input port at two operating frequencies has well Join and isolate, reached below-20dB.Comparison diagram 6B and Fig. 7 B is it will be seen that the preferred embodiment of the present invention passive double Frequently the amplitude of Six-port waveguide parts output port at two operating frequencies is equal, and preferable range value is-6.021dB, physics Model emulation figure is close to preferable range value.It will be seen that the passive double-frequency of the preferred embodiment of the present invention from Fig. 6 C and Fig. 7 C The phase contrast of Six-port waveguide parts output port at two operating frequencies is identical.

Table Ⅰ and Table Ⅱ show in the scattering parameter amplitude of two different operating frequencies and phase place brief summary.

Table I

Can be seen that from table I for preferable artificial circuit, for two operating frequencies, there is identical phase contrast, S₄₂With S₃₂Between phase contrast be 0 °, S₅₂With S₃₂Between phase contrast be-90 °, S₆₂With S₃₂Between phase contrast be 90 °.

Table II

It can be seen that for physical model artificial circuit, two operating frequencies are had close phase contrast from table II, It is respectively 0.001 ° ,-90.232 °, 90.063 ° at f=3GHz, is respectively 0.138 ° ,-89.725 °, 89.34 ° at f=5GHz. Visible, the passive double-frequency six-port device of the preferred embodiment of the present invention is substantial access to the parameter index of ideal model, it is achieved that this The purpose of invention.

So far, already in connection with accompanying drawing, the present embodiment has been described in detail.According to above description, those skilled in the art The passive double-frequency six-port device of the present invention should be had and clearly recognize.

In sum, the present invention provides the passive double-frequency six-port device of a kind of planar microstrip structure, overcomes right-hand man The transmission line shortcoming that the phase contrast of output port is contrary in two operating frequencies, it is achieved four output port amplitude deciles.With Time, this passive double-frequency six-port device also have simple in construction, cost is low, size is little, operating frequency width, two operating frequencies Output port phase contrast phase same advantages in two frequencies, has good popularizing application prospect.

Particular embodiments described above, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail Describe in detail bright, be it should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to the present invention, all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in the guarantor of the present invention Within the scope of protecting.

Claims (9)

1. a passive double-frequency six-port device, it is characterised in that including:

Double-frequency Wilkinson power divider (A), its first port (a1) is as the first port of passive double-frequency six-port device (Port1)；

First double frequency branch line coupler (B), its first port (b1) is as the second end of described passive double-frequency six-port device Mouth (Port2), the 4th port (b4) is connected to ground by 50 Ω loads；

Second double frequency branch line coupler (C), its second port (c2) is connected to the of described double-frequency Wilkinson power divider (A) Two-port netwerk (a2), the 3rd port (c3) is connected to second port (b2) of described first double frequency branch line coupler (B), the first end Mouthful (c1) and the 4th port (c4) are respectively as the 4th port (Port4) and the 6th port of described passive double-frequency six-port device (Port6)；

3rd double frequency branch line coupler (D), its second port (d2) is connected to the of described double-frequency Wilkinson power divider (A) Three ports (a3), the 3rd port (d3) is connected to the 3rd port (b3) of described first double frequency branch line coupler (B), the first end Mouthful (d1) and the 4th port (d4) are respectively as the fifth port (Port5) of described passive double-frequency six-port device and the 3rd port (Port3)；

In described passive double-frequency six-port device, described first port (Port1) and the second port (Port2) are input port, Described 3rd port (Port3), the 4th port (Port4), fifth port (Port5) and the 6th port (Port6) are outfan Mouthful；

Described first double frequency branch line coupler (B), the second double frequency branch line coupler (C), the 3rd double frequency branch line coupler (D), branch line coupler (l is included respectively₂,l₃) and described branch line coupler 4 ports each cascade even The the first double frequency impedance matching microstrip line (l connect_a), the second double frequency impedance matching microstrip line (l_b) and lead-in wire (l₀)；

Described branch line coupler (l₂,l₃), including the first couple of microstrip line (l be arrangeding in parallel in the first direction₂), along with first Second couple of microstrip line (l that the vertical second direction in direction be arranged in parallel₃)；

The characteristic impedance Z of above-mentioned all microstrip lines_iMeet: 20 Ω ＜ Z_i＜ 120 Ω, wherein i=a, b, 2,3.

Passive double-frequency six-port device the most according to claim 1, it is characterised in that described double-frequency Wilkinson power divider (A) including:

The first couple of coupling line (cl being set parallel to each other₁), its left end is connected to each other as double-frequency Wilkinson power divider A Single port (a1)；

First isolation resistance (R₁), it is connected between the right output port of described first pair of coupling line；

The second couple of coupling line (cl being set parallel to each other₂), its left end level is coupled to the right-hand member of first pair of coupling line, and its right-hand member is respectively The second port (a2) and the 3rd port (a3) as double-frequency Wilkinson power divider (A)；And

Second isolation resistance (R₂), it is connected between the right output port of described second pair of coupling line.

Passive double-frequency six-port device the most according to claim 2, wherein,

Described first couple of coupling line (cl₁) left end be connected to a lead-in wire (l₀), to form double-frequency Wilkinson power divider (A) First port (a1)；And

Described second couple of coupling line (cl₂) two ports of right-hand member are connected respectively to two lead-in wire (l that length is identical₀), with respectively Form the second port (a2) and the 3rd port (a3) of double-frequency Wilkinson power divider (A).

Passive double-frequency six-port device the most according to claim 3, it is characterised in that described double-frequency Wilkinson power divider (A) parameter in meets following condition:

$Z_{e1}=Z_o\sqrt{\frac{\sqrt{1+8{\tan }^4{\mathrm{\θ}}_1}-1}{{\tan }^2{\mathrm{\θ}}_1}},$

$Z_{e2}=Z_o\sqrt{\frac{\sqrt{1+8{\tan }^4{\mathrm{\θ}}_1}+1}{2{\tan }^2{\mathrm{\θ}}_1}},$

$R_1=\frac{2Z_{o1}{Z}_{o2}{\tan }^2{\mathrm{\θ}}_1}{\sqrt{(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1(Z_{o1}{\tan }^2{\mathrm{\θ}}_1-Z_{o2})}},$

$R_2=\frac{2Z_o{Z}_{o2}^2(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1+2Z_o^2{Z}_{o2}\sqrt{(Z_{o1}+Z_{o2}){\tan }^2{\mathrm{\θ}}_1(Z_{o1}{\tan }^2{\mathrm{\θ}}_1-Z_{o2})}}{Z_o^2{Z}_{o2}+(Z_{o1}{Z}_{o2}^2-Z_o^2{Z}_{o1}+Z_{o2}^3){\tan }^2{\mathrm{\θ}}_1},$

Wherein, f₁And f₂It is respectively two operating frequencies, Z_e1For the even modular character impedance of described first pair of coupling line, Z_e2For described The even modular character impedance of second pair of coupling line, R₁,R₂For described first isolation resistance and the resistance of the second isolation resistance, Z_oFor drawing Line (l₀) characteristic impedance, θ₁It is first pair of coupling line and the electrical length of second pair of coupling line, Z_o1,Z_o2It is respectively first to coupling Line and the strange modular character impedance of second pair of coupling line.

Passive double-frequency six-port device the most according to claim 4, the parameter in described double-frequency Wilkinson power divider (A) Meet following condition further:

Z_o1＜ Z_e1＜ 1.5Z_o1, Z_o2＜ Z_e2＜ 1.5Z_o2；

20 Ω ＜ Z_e1, Z_e2＜ 150 Ω, 20 Ω ＜ Z_o1, Z_o2＜ 120 Ω；And

Z_o=50 Ω.

Passive double-frequency six-port device the most according to claim 1, described first double frequency branch line coupler (B), second Double frequency branch line coupler (C) with the 3rd double frequency branch line coupler (D) for having mutually isostructural double frequency branch line coupler, Each described double frequency branch line coupler includes: branch line coupler (l₂, l₃), in 4 ports difference of this branch line coupler The first double frequency impedance matching microstrip line (l that cascade connects_a), the second double frequency impedance matching microstrip line (l_b) and lead-in wire (l₀)。

7. according to the passive double-frequency six-port device described in claim 1 or 6, wherein,

Described branch line coupler includes the first couple of microstrip line (l be arrangeding in parallel in the first direction₂), along vertical with first direction Second couple of microstrip line (l be arrangeding in parallel of second direction₃)；

Every described lead-in wire (l₀) it is connected to the second double frequency impedance matching microstrip line (l of each port_bOn), form each double frequency 4 ports of branch line coupler.

Passive double-frequency six-port device the most according to claim 7, it is characterised in that each described double frequency branch line couples The parameter of device meets following condition:

$Z_2=\sqrt{2}{Z}_3,$

$Z_a=\frac{-H\±\sqrt{H^2-4FK}}{2F},$

$Z_b=-\frac{B}{4A}+\frac{1}{2}\sqrt{(\frac{B^2}{4A^2}-\frac{2C}{3A}+{\mathrm{\Δ}}_1+{\mathrm{\Δ}}_2)}+\frac{1}{2}\sqrt{(\frac{B^2}{2A^2}-\frac{4C}{3A}-{\mathrm{\Δ}}_1-{\mathrm{\Δ}}_2+\frac{4ABC-B^3-8A^{2}D}{4A^3\sqrt{(\frac{B^2}{4A^2}-\frac{2C}{3A}+{\mathrm{\Δ}}_1+{\mathrm{\Δ}}_2)}})},$

$R_{in}=\frac{\sqrt{(Z_2^2-Z_3^2)Z_2^2{Z}_3^2{\sin }^2\left(\mathrm{\θ}\right)}}{(Z_2+Z_3)\[Z_2-Z_3+(Z_2+Z_3){\cos }^2\left(\mathrm{\θ}\right)\]},$

$X_{in}=\frac{(Z_2+Z_3)Z_2{Z}_{3}cos\left(\mathrm{\θ}\right)sin\left(\mathrm{\θ}\right)}{(Z_2+Z_3)\[Z_2-Z_3+(Z_2+Z_3){\cos }^2\left(\mathrm{\θ}\right)\]},$

A=R_in(Z_o-R_in)tan²(θ),

B=2Z_oR_inX_intan³(θ),

$C=\left(R_{in}-Z_o\right)\left(Z_o{R}_{in}^2+Z_o{X}_{in}^2-Z_o^2{R}_{in}\right)-\[2+{\tan }^2\left(\mathrm{\θ}\right)\]{\tan }^2\left(\mathrm{\θ}\right)Z_o^2{X}_{in}^2,$

$D=-2Z_o^3{R}_{in}{X}_{in}{\tan }^3\left(\mathrm{\θ}\right),$

$E=Z_o^3{R}_{in}(R_{in}^2+X_{in}^2-Z_o{R}_{in}){\tan }^2\left(\mathrm{\θ}\right),$

F=-Z_otan²(θ),

H=(Z_o-R_in)Z_b-Z_oX_inTan (θ),

$K=R_{in}{Z}_b^2{\tan }^2\left(\mathrm{\θ}\right)-Z_o{X}_{in}{Z}_{b}tan\left(\mathrm{\θ}\right),$

${\mathrm{\Δ}}_1=\left(\begin{array}{c}\frac{\sqrt[3]{2}(C^2-3BD+12AE)}{3A\[2C^3-9BCD+27{\mathrm{AD}}^2+27B^{2}E-72ACE}\\ +\sqrt{-4{(C^2-3BD+12AE)}^3+{(2C^3-9BCD+27{\mathrm{AD}}^2+27B^{2}E-72ACE)}^2}{\]}^{1/3}\end{array}\right),$

${\mathrm{\Δ}}_2=\frac{(C^2-3BD+12AE)}{{\mathrm{\Δ}}_1{\left(3A\right)}^2},$

Wherein, Z₂,Z₃It is respectively first couple of microstrip line (l₂) and second couple of microstrip line (l₃) characteristic impedance, Z_a,Z_bIt is respectively every First double frequency impedance matching microstrip line (l of individual port_a) and the second double frequency impedance matching microstrip line (l_b) characteristic impedance, Z_oFor Lead-in wire (l₀) characteristic impedance, θ is the electrical length of above-mentioned all microstrip lines.

9., according to the passive double-frequency six-port device described in claim 4 or 8, the parameter of described passive double-frequency six-port device is full Foot states condition:

Z_e1=81.5769 Ω, Z_o1=43.3340 Ω, Z_e2=61.2918 Ω,

Z_o2=40.1384 Ω, R₁=63.0738 Ω, R₂=565.1966 Ω,

Z_a=41.5501 Ω, Z_b=74.7131 Ω, Z₂=42.4264 Ω,

Z₃=30 Ω, θ₁=θ=90 °,

Two operating frequencies of passive double-frequency six-port device are respectively f₁=3GHz, f₂=5GHz；

Wherein, Z₂,Z₃It is respectively first couple of microstrip line (l₂) and second couple of microstrip line (l₃) characteristic impedance, Z_a,Z_bIt is respectively every First double frequency impedance matching microstrip line (l of individual port_a) and the second double frequency impedance matching microstrip line (l_b) characteristic impedance, Z_oFor Lead-in wire (l₀) characteristic impedance, θ is the electrical length of above-mentioned all microstrip lines.