CN205900759U - Ware is divided to miniaturized high isolation's microwave dual -frenquency merit - Google Patents

Abstract

The utility model discloses a ware is divided to miniaturized high isolation's microwave dual -frenquency merit, including input port, link, isolation network, first transmission line, second transmission line, an output port and the 2nd output port, input port passes through the link and connects first transmission line and second transmission line respectively, and first transmission line and second transmission line correspond respectively and connect an output port and the 2nd output port, are provided with isolation network between link and first transmission line and the second transmission line. The utility model discloses the terminal no isolation network of ware is divided to microwave dual -frenquency merit, has reduced the merit effectively and has divided the volume of ware and the coupling effect between the output, has improved the isolation, but has a great deal of advantages such as circuit structure compactness and design method flexible and diverse moreover, has greatly widened the practical application scope that the ware is divided to traditional microwave dual -frenquency merit.

Description

A kind of microwave dual-frequency power divider of miniaturization high-isolation

Technical field

This utility model is related to a kind of power splitter, particularly to a kind of microwave dual-frequency power divider of miniaturization high-isolation.

Background technology

Developing rapidly with mobile communication, the use of microwave frequency band is more and more crowded, and meanwhile, radio circuit is integrated will Seek degree more and more higher, it is also proposed that low cost, low-loss, small size and light weight etc. will in addition to requiring excellent performance Ask, the radio-frequency unit therefore, it is possible to carry out signal transmission in the even multiple frequency range of two frequency ranges simultaneously is current mobile communication system The development trend of system.Microwave double-frequency power amplifier is one of critical component of radio system and communication system, with communication skill The fast development of art and the aggravation of communication industry competition, in radio frequency microwave system, propose more to microwave dual-frequency power divider performance Carry out higher requirement.

At present, the implementation of microwave dual-frequency power divider typically have following several:

1st, power splitter is designed using the structure of conventional microstrip line, this design can cause in welding isolation element Afterwards, the distribution capacity inductance easily being formed impacts to circuit performance, and the size accounting for is larger.

2nd, power splitter is designed using the structure of coupling line, this kind of design then occurs the distance of two output ports Too short, cause the interactive situation of output signal.

3rd, coupling line adds the microstrip line construction extending output port, and this kind of design effectively overcomes welding isolation unit The ghost effect of part formation and output port are apart from too short problem, but the extra microstrip line in order to extend output port accessing Cause design size excessive, be unfavorable for the design of miniaturization.

The power splitter of prior art is all the end that isolation element is connected in parallel on output port, and the power splitter of this structure is made Become, between output port, there is very big coupling effect.

Utility model content

The purpose of this utility model is to overcome the shortcoming of prior art and deficiency, provides a kind of miniaturization high-isolation Microwave dual-frequency power divider.This power splitter can be applied to two operating frequencies and end no isolation network, effectively reduces work( Divide the coupling effect between the volume of device and outfan, there is circuit structure compact and increase circuit structure design motility Advantage.

The purpose of this utility model is achieved through the following technical solutions: a kind of microwave double frequency work(of miniaturization high-isolation divides Device, including input port, coupling line, isolation network, the first transmission line, the second transmission line, the first output port and the second output Port, coupling line includes first port and second port and the 3rd end being in the coupling line other end being in coupling line one end Mouth and the 4th port；

Input port connects first port and the second port of coupling line, and the first transmission line is passed through in the 3rd port of coupling line Connect the first output port, the 4th port of coupling line is passed through the second transmission line and connected the second output port；Coupling line the 3rd end Mouthful and the first transmission line junction connect one end of isolation network, coupling line the 4th port and the second transmission line junction connect every The other end of off-network network.

Preferably, described first transmission line and the second transmission line are microstrip line.

Preferably, two transmission lines in described coupling line are microstrip line.

Preferably, described first transmission line and the second transmission line are parallel relation or the certain angle that staggers between the two.

Preferably, described isolation network is the isolation network with complex impedance.

Further, described isolation network includes isolation resistance and lc series resonant circuit, in lc series resonant tank Electric capacity including series connection and inductance, wherein lc series resonant circuit and isolation resistance are in parallel；Isolation resistance and lc series resonance electricity After the parallel connection of road, wherein one end is connected to the junction of coupling line the 3rd port and the first transmission line, and the other end is connected to coupling line the Four ports and the junction of the second transmission line.

Further, microwave dual-frequency power divider first operating frequency f₁For 1.4ghz, the second operating frequency f₂For 2.8ghz；The width w1=1.29mm of the first transmission line and the second transmission line, length is l1=20mm；The width w2=of coupling line 0.87, length l2=20mm, gap s=3mm.

Further, isolation resistance r=150 ω in isolation network；Inductance l in the lc series resonant circuit of isolation network =20nh, electric capacity c=0.3pf.

This utility model has such advantages as with respect to prior art and effect:

(1) microwave dual-frequency power divider of the present invention by the coupling line between input and two outfans, isolation network and Two transmission lines compositions, can be applied to two operating frequencies, and the isolation network of microwave dual-frequency power divider of the present invention is located at coupling Between line and two transmission lines, its end no isolation network, effectively reduce the coupling between the volume of power splitter and outfan Close effect, improve isolation, and there is many advantages, such as circuit structure is compact and method for designing can be versatile and flexible, greatly The practical ranges of traditional microwave dual-frequency power divider are widened.Do not need defeated additionally, due to microwave dual-frequency power divider of the present invention Between exit port, isolation element in parallel, therefore connects the first transmission line of two output ports and the second transmission line can arbitrarily be opened Open bending in case connect next stage circuit module so as between coupling operation less；And the coupled line structure of input and The structure of outfan no isolation element makes circuit more compact；Solve prior art dual-frequency power divider to set isolation resistance Put end bring the distance of output port too short or plus transmission line especially cause oversized technology to ask in output port Topic.

(2) coupling line between this utility model microwave dual-frequency power divider input and two outfans, the first transmission line Can be all the planar transmission lines such as micro-strip with the second transmission line, the design of this planar transmission structure makes this utility model double frequency Power splitter has the advantages that cost is lower, compact conformation is flexible.

(3) this utility model microwave dual-frequency power divider coupling line, the microstrip line as the first transmission line and the second transmission line There is identical electrical length and resonant network, therefore there is the response of identical double frequency, be capable of the response of each ratio double frequency.

Brief description

Fig. 1 a and 1b is this utility model microwave dual-frequency power divider circuit structure diagram.

Fig. 2 is this utility model microwave dual-frequency power divider idol moding circuit structure chart.

Fig. 3 is this utility model microwave dual-frequency power divider basic mode circuit structure diagram.

Fig. 4 is this utility model microwave dual-frequency power divider input return loss s11 parameter and output return loss s22 parameter Curve chart.

Fig. 5 is this utility model microwave dual-frequency power divider isolation s23 parametric plot.

Specific embodiment

With reference to embodiment and accompanying drawing, this utility model is described in further detail, but enforcement of the present utility model Mode not limited to this.

Embodiment 1

Present embodiment discloses a kind of microwave dual-frequency power divider of miniaturization high-isolation, as seen in figure la and lb, including Input port 1, coupling line 2, isolation network 3, the first transmission line 4, the second transmission line 5, the first output port 6 and the second outfan Mouthfuls 7, coupling line 2 includes being in the first port of coupling line 2 one end and second port and the be in coupling line 2 other end the 3rd Port and the 4th port.

Input port 1 connects first port and the second port of coupling line 2, and the 3rd port of coupling line 2 is passed through first and passed Defeated line 5 connects the first output port 6, and the 4th port of coupling line 2 connects the second output port 7 by the second transmission line 5；Coupling Line 2 the 3rd port and one end, coupling line 2 the 4th port and second transmission line of the first transmission line 4 junction connection isolation network 3 6 junctions connect the other end of isolation network 3.

In the present embodiment, coupling line 2, the first transmission line 4 and the second transmission line 5 are microstrip line.First biography as shown in Figure 1a Defeated line and the second transmission line are parallel relation naturally it is also possible to as shown in Figure 1 b, the first transmission line and the second transmission line it Between stagger certain angle α, the whole setting specifically being carried out according to next stage circuit module, the first transmission line and the second transmission line energy Enough arbitrarily opening bends connection next stage circuit module.

Above-mentioned isolation network can be the isolation network with complex impedance, and isolation network 3 includes isolation electricity in the present embodiment Resistance r and lc series resonant circuit 8, lc series resonant tank includes electric capacity and the inductance connected, wherein lc series resonant circuit 8 In parallel with isolation resistance r；After isolation resistance and lc series resonant circuit 8 parallel connection, wherein one end is connected to coupling line 2 the 3rd port With the junction of the first transmission line 5, the other end is connected to coupling line 2 the 4th port and the junction of the second transmission line 6.

In the present embodiment, the first transmission line 4 and the second transmission line 5 are structure symmetrical above and below, i.e. the first transmission line 4 and second Each parameter of transmission line 5 is identical.

In the present embodiment, microwave dual-frequency power divider first operating frequency corresponds to electrical length θ₁For:

${\mathrm{\θ}}_1=\frac{\mathrm{\π}}{1+u};$

Described microwave dual-frequency power divider second operating frequency corresponds to electrical length θ₂For:

${\mathrm{\θ}}_2=\frac{u\mathrm{\π}}{1+u};$

Wherein u is dual-frequency power divider frequency ratio, and in the present embodiment, dual-frequency power divider frequency ratio u is known, as needed the Ratio between one operating frequency and the second operating frequency gets.In the present embodiment, dual-frequency power divider frequency ratio u is 1/2.Above-mentioned Electrical length θ asked for₁And electrical length θ₂It is coupling line and the electricity as the first transmission line and the microstrip line of the second transmission line Length, under same operating frequency, coupling line and two micro-strip as the first transmission line and the second transmission line in the present embodiment The electrical length of line is identical.

Analyzed by even mould, the circuit structure of the present embodiment microwave dual-frequency power divider can be reduced to as shown in Figure 2, obtain Go out the even modular character impedance z of coupling line^eFor:

$z^e=z_0\sqrt{\sqrt{\frac{1}{{\tan }^2{\mathrm{\θ}}_1}+8}-\frac{1}{{\mathrm{tan\θ}}_1}};$

Wherein z₀Port Impedance for input port and the first output port and the second output port；

Show that the characteristic impedance z of the first transmission line and the second transmission line is:

$z=\sqrt{\frac{{z_0}^2}{2{\tan }^2{\mathrm{\θ}}_1}+\sqrt{{\left(\frac{{z_0}^2}{2\left({\tan }^2{\mathrm{\θ}}_1\right)}\right)}^2+2{z_0}^4}};$

By Archetype Analysis, the circuit structure of the present embodiment microwave dual-frequency power divider can be reduced to as shown in Figure 3, obtain Getting isolation resistance r in isolation network is:

$r=2\frac{z_0^2+z^2{\mathrm{tan\θ}}_1}{z_0{\mathrm{sec\θ}}_1};$

In isolation network lc series resonant circuit, electric capacity c is:

$c=\frac{{\mathrm{\ω}}_2-{\mathrm{\ω}}_1}{2{\mathrm{\ω}}_2{\mathrm{\ω}}_1}(\frac{z{\sec }^2{\mathrm{\θ}}_1{\mathrm{tan\θ}}_1}{z_0^2+z^2{\tan }^2{\mathrm{\θ}}_1}+\frac{1}{z^o}{\mathrm{cot\θ}}_1-\frac{1}{z}{\mathrm{tan\θ}}_1);$

In isolation network lc series resonant circuit, electric capacity l is:

$l=\frac{2}{{\mathrm{\ω}}_2-{\mathrm{\ω}}_1}{(\frac{z{\sec }^2{\mathrm{\θ}}_1{\mathrm{tan\θ}}_1}{z_0^2+z^2{\tan }^2{\mathrm{\θ}}_1}+\frac{1}{z^o}{\mathrm{cot\θ}}_1-\frac{1}{z}{\mathrm{tan\θ}}_1)}^{-1}.$

Wherein ω₁For microwave dual-frequency power divider first operating frequency f₁Under corresponding angular frequency, ω₁=2 π f₁, ω₂For microwave Dual-frequency power divider second operating frequency f₂Under corresponding angular frequency, ω₂=2 π f₂, z^oBasic mode impedance for coupling line.

The basic mode impedance z of coupling line in the present embodiment^oCan by the coupling line gap s required by specific design and on State the even modular character impedance z of calculated coupling line^eDraw.

The present embodiment microwave dual-frequency power divider is arranged on fr4 sheet material, when the first operating frequency f₁=1.4ghz, second Operating frequency f₂During=2.8ghz, by the present embodiment, get θ₁、θ₂It is respectively 60 degree and 120 degree；First transmission line and second The width w1=1.29mm of transmission line, length is l1=20mm；The width w2=0.87 of coupling line, length l2=20mm, gap s =3mm.Isolation resistance r=150 ω in isolation network；Inductance l=20nh, electric capacity c in the lc series resonant circuit of isolation network =0.3pf；Calculate the even mode impedance z of coupling line by simulation software ads^eFor 78.84 ω, basic mode impedance z^oFor 73.05 ω, The characteristic impedance z of the first transmission line and the second transmission line is 63 ω.

The present embodiment microwave dual-frequency power divider under each operating frequency, input return loss s11 and output return loss s22 Respectively as in Fig. 4, the isolation s23 between the first output port and the second output port is as shown in Figure 5.In the present embodiment, lead to The electrical length of overcoupling line, the first transmission line and the second transmission line sets, and gets the first operating frequency f₁For 1.4ghz and Second operating frequency f₂Microwave dual-frequency power divider for 2.8ghz.Figure 4, it is seen that when the present embodiment microwave double frequency work(divides First operating frequency f of device₁For 1.4ghz, the second operating frequency f₂For 2.8ghz, when as working under the frequency ratio of twice, input Return loss s11 and output return loss s22 are both less than -40db, are that the return loss of each port has more than 40db, explanation Under this two operating frequencies, each port all has good coupling.In addition from figure 5 it can be seen that the present embodiment is operated in First operating frequency f₁For 1.4ghz and the second operating frequency f₂Between the output port of microwave dual-frequency power divider for 2.8ghz Isolation s23 is both less than -48db, and that is, the isolation between output port is more than 48db, illustrates that the present embodiment above-mentioned two works Between microwave dual-frequency power divider output port under frequency, there is good isolation.

Above-described embodiment be this utility model preferably embodiment, but embodiment of the present utility model be not subject to above-mentioned The restriction of embodiment, other any without departing from the change made under spirit of the present utility model and principle, modify, replace Generation, combination, simplification, all should be equivalent substitute mode, are included within protection domain of the present utility model.

Claims (6)

1. a kind of microwave dual-frequency power divider of miniaturization high-isolation is it is characterised in that include input port, coupling line, isolation Network, the first transmission line, the second transmission line, the first output port and the second output port, coupling line includes being in coupling line one The first port at end and second port and the 3rd port and the 4th port that are in the coupling line other end；

Input port connects first port and the second port of coupling line, and the 3rd port of coupling line is passed through the first transmission line and connected First output port, the 4th port of coupling line is passed through the second transmission line and is connected the second output port；Coupling line the 3rd port and First transmission line junction connects one end of isolation network, and coupling line the 4th port and the second transmission line junction connect separation net The other end of network.

2. the microwave dual-frequency power divider of miniaturization high-isolation according to claim 1 is it is characterised in that described first passes Defeated line and the second transmission line are microstrip line.

3. the microwave dual-frequency power divider of miniaturization high-isolation according to claim 1 is it is characterised in that described coupling line In two transmission lines be microstrip line.

4. the microwave dual-frequency power divider of miniaturization high-isolation according to claim 1 is it is characterised in that described first passes Defeated line and the second transmission line are parallel relation or the certain angle that staggers between the two.

5. the microwave dual-frequency power divider of miniaturization high-isolation according to claim 1 is it is characterised in that described separation net Network is the isolation network with complex impedance.

6. the microwave dual-frequency power divider of miniaturization high-isolation according to claim 5 is it is characterised in that described separation net Network includes isolation resistance and lc series resonant circuit, and lc series resonant tank includes electric capacity and the inductance connected, and wherein lc goes here and there Connection resonance circuit and isolation resistance are in parallel；After isolation resistance and the parallel connection of lc series resonant circuit, wherein one end is connected to coupling line the Three ports and the junction of the first transmission line, the other end is connected to the junction of coupling line the 4th port and the second transmission line.