CN205303640U - Branch wilkinson power divider such as dual -frenquency based on slow wave structure - Google Patents

Abstract

The utility model discloses a branch wilkinson power divider such as dual -frenquency based on slow wave structure, including being connected with first port, second port and the third port of load, the first equivalent transmission line network that constitutes by first equivalent transmission line and second equivalence transmission line, the equivalent transmission line network of second who constitutes by third equivalence transmission line and the equivalent transmission line of fourth to and RLC parallel resonance network, the utility model also provides a branch wilkinson power divider such as dual -frenquency based on slow wave structure's circuit parameter design method. The utility model discloses the branch wilkinson power divider such as dual -frenquency of a small and accurate realization impedance conversion are realized to utilization open a way microstrip line and parallelly connected RLC resonance network. This circuit structure has realized not only that great degree reduces the merit and divides the volume of ware and the dual frequency operation who realizes the accuracy, still has some smooth dispersion characteristic in addition on the high frequency.

Description

Two based on slow-wave structure wait point Wilkinson power divider frequently

Technical field

The utility model relates to a kind of power divider, particularly relates to a kind of Wilkinson power divider.

Background technology

Power divider (power splitter) is mainly used in pro rata distributing power, particularly microwave power amplifier (PA), microwave and RF application application widely, by the output rating of two PA is synthesized and convert Single-end output to, alleviate the problem that when single PA exports equal-wattage, power consumption is big largely, but, owing to the size of power splitter is relatively big, thus its application at integrated circuit connection is limited. In addition, traditional Wilkinson power divider is only applicable to specific base wave frequency and odd harmonic thereof, very obviously can not meet the requirement in Modern Communication System multiband and broadband, and along with the functions of modules of handheld device more and more complicated, the integrated level of each module chip is more and more higher, for adapting to this trend, the area size that research reduces power splitter has important actual meaning.

Although the people such as I.Lin are (I.Lin in the literature, M.Vincentis, etal.Arbitrarydual-bandcomponentsusingcompositeright/lef t-handtransmissionlines [J] .IEEETrans.Microw.TheoryTech., Apr.2004,52 (4): 1142-1149.) by adopting special circuit structure and material to realize dual-frequency power divider, but these methods are for too complicated microwave integrated circuit.

In the prior art, report the multiple technical scheme realizing dual-frequency power divider, such as document (MonzonC.ASmallDual-FrequencyTransformerinTwoSections [J] .IEEETtransactionsonMicrowaveTheoryandTechniques.2003, 51 (4): 1157-61.) by the transmission line of cascade two different qualities impedances, realize the impedance transformation device being used for any two frequencies, but this can not realize the function of 1/4th impedance umformers completely, therefore on this basis, document (LeiWu, SunZ, etal.ADual-FrequencyWilkinsonPowerDivider [J] .IEEETtransactionsonMicrowaveTheoryandTechniques.2006, 54 (1): 278-84.) RLC resonant network in parallel is used to achieve the double-frequency Wilkinson power divider of arbitrary proportion, but this does not make the size of power splitter be reduced the complicacy that improve system debugging on the contrary, therefore, document (RawatK, GhannouchiFM.ADesignMethodologyforMiniaturizedPowerDivid ersUsingPeriodicallyLoadedSlowWaveStructureWithDual-Band Applications [J] .IEEETtransactionsonMicrowaveTheoryandTechniques.2009, 57 (12): 3380-8.) propose to adopt slow-wave structure to substitute the transmission line of power divider circuit.In addition, owing to the phase velocity of the transmission line of slow-wave structure is more much smaller than the light velocity, therefore there are comparatively smooth dispersion property, so more traditional broadband technology is more suitable for the application in broadband.

In Chinese patent 201220433173.9, step electric impedance resonator is adopted to realize the function of two conversion of impedance frequently, but this kind of method does not reduce the volume of power splitter largely.

In addition, in Chinese patent 201010213812.6, two joint transmission lines are adopted to realize impedance conversion, and by improving isolation at two output ports, one section of open circuit microstrip line in parallel respectively, but this kind of method can not reduce the volume of power splitter effectively.

Practical novel content

In the two Wilkinson method of design frequently reported, rely on specific panel material, adopt the microstrip line construction of traditional way, thus make designed power splitter volume too huge and uneven in the dispersion property of high band, be not suitable for the requirement of Modern Communication System.

The utility model adopts the slow-wave structure of periodically capacitive load mode, it is proposed to a kind of structure is simple, is beneficial to the double-frequency Wilkinson power divider circuit structure that miniaturization can realize accurate impedance conversion simultaneously. It is achieved through the following technical solutions:

A kind of two frequently grade based on slow-wave structure divides Wilkinson power divider, comprise the first port, Two-port netwerk and the 3rd port that are connected with load, the the first equivalent transmission line network being made up of the first equivalent transmission line 102 and the 2nd equivalent transmission line 110, the 2nd equivalent transmission line network being made up of the 3rd equivalent transmission line 103 and the 4th equivalent transmission line 111, and RLC series resonant network 106;

Described first port is connected to the first equivalent transmission line 102 and the junction of the 2nd equivalent transmission line 110 through the first transmission line 101;

The other end of described first equivalent transmission line 102 is connected with the 3rd equivalent transmission line 103;

The other end of described 2nd equivalent transmission line 110 is connected with the 4th equivalent transmission line 111;

Described Two-port netwerk is connected to the other end of the 3rd equivalent transmission line 103 and the junction of RLC series resonant network 106 through the 2nd transmission line 104;

Described 3rd port is connected to the other end of the 4th equivalent transmission line 111 and the junction of the other end of RLC series resonant network 106 through the 3rd transmission line 105;

Described first and second equivalent transmission line networks form the slow-wave structure periodically loaded by multiple independent slow-wave structure minimum unit 108; Described slow-wave structure minimum unit 108 forms by transmission line section 109 and open circuit transmission line section 107; The parameter of the slow-wave structure minimum unit 108 of described first and second equivalent transmission line networks is different.

Further, described first port, Two-port netwerk are identical with the resistance of the load that the 3rd port connects, and are designated as Z₀;

Described first port is Z at Two-port netwerk and the 3rd port load resistance₀Time input resistance be Z₀;

Described Two-port netwerk is Z at the first port and the 3rd port load resistance₀Time input resistance be Z₀;

Described 3rd port is input resistance during Z0 at the first port and Two-port netwerk load resistance is Z₀��

Further, the length of described first transmission line 101, the 2nd transmission line 104 and the 3rd transmission line 105 is ��/2, and natural impedance is Z₀; The length of described first transmission line, the 2nd transmission line and the 3rd transmission line refers to center axial length, and shape can change flexibly. The length of described first transmission line, the 2nd transmission line and the 3rd transmission line can be the integral multiple of any ��/2, and when requiring without the need for strict phase, length can be any;Wherein �� is the wavelength of corresponding operating frequency.

Further, in order to eliminate the capacity effect at transmission line right angle, adopt corner cut process in all equivalent transmission line corners, and the width of corner cut 112 is that corner connects 1.8 times of equivalent transmission line live width.

The utility model additionally provides a kind of described two circuit parameter design methods frequently waiting point Wilkinson power divider based on slow-wave structure; It comprises the following steps:

Steps A, it is determined that pcb board material parameter, it is determined that described first port, Two-port netwerk and the 3rd port are met the resistance value of load and any two Frequency point f of described power splitter₁��f₂(f₁��f₂), and remember f₁=Mf₂, the minimum proportion factor of the first and second equivalent transmission line networks is calculated according to described frequency ratio M; The resistance value of load is connect according to the first port, Two-port netwerk and the 3rd port, and any two frequency f₁��f₂Phase constant (��₁, ��₂), calculate the natural impedance (Z of the first and second equivalent transmission line networks₁, Z₂), length (l₁, l₂), and capacitance Cx in RLC series resonant network 106 and inductance value Lx;

Step B, according to the length of the first and second equivalent transmission line networks calculated in described steps A, calculates total electrical length of corresponding first and second equivalent transmission line networks; According to the sheet material parameter determined in described steps A, it is determined that the live width of each slow-wave structure minimum unit transmission line section 109, the natural impedance of open circuit transmission line section 107, and the phase velocity of the first and second equivalent transmission line networks under described any two frequencies; Calculate the length d of the transmission line section 109 corresponding to slow-wave structure minimum unit 108 during described first and second equivalent transmission line network; Calculate the length d of the open circuit transmission line section 107 of described slow-wave structure minimum unit 108_stub; Described slow-wave structure minimum unit 108 is cascaded up, and replaces the first and second equivalent transmission line networks described in steps A respectively.

Generalized case, according to processing condition such as the processing processes precision of producer and minimum feature, the live width of slow-wave structure minimum unit transmission line section 109, the natural impedance Zc of corresponding transmission line is more big, the velocity of wave of equivalence is more little, the size of the transmission line of the slow-wave structure then adopted is more little, and therefore, the live width of slow-wave structure minimum unit transmission line section 109 generally elects the minimum value that current technique allows as;

Further, in described steps A, in order to guaranteed power evenly distribute, the resistance value that the first port, Two-port netwerk are connect load with the 3rd port is all Z mutually₀��

Further, in described steps A, the minimum proportion factor of the first and second equivalent transmission line networks is positive integer n.

Further, in described steps A, in order to make the physics size of described power splitter minimum, the first and second equivalent transmission line l₁With the third and fourth equivalent transmission line l₂Length equal and be:

$l_1=l_2=\frac{n\mathrm{\π}}{{\mathrm{\β}}_1+{\mathrm{\β}}_2}$

Transmission line characteristics impedance (the Z of the first and second equivalent transmission line networks₁, Z₂) it is respectively:

$Z_1=\frac{Z_0{R}_L}{Z_2}$

$Z_2=\sqrt{\frac{Z_0}{2\mathrm{\α}}(R_L-Z_0)+\sqrt{{\[\frac{Z_0(R_L-Z_0)}{2\mathrm{\α}}\]}^2+R_L{Z_0}^3}}$

Wherein, R_LFor the resistance in described RLC series resonant network 106, R_L=2Z₀, ��=(tan ��₁l₁)²,

Capacitance Cx and inductance value Lx in RLC series resonant network are respectively:

$C_x=\frac{A/{\mathrm{\ω}}_2-B/{\mathrm{\ω}}_1}{2({\mathrm{\ω}}_1/{\mathrm{\ω}}_2-{\mathrm{\ω}}_2/{\mathrm{\ω}}_1)}$

$L_x=\frac{2({\mathrm{\ω}}_1/{\mathrm{\ω}}_2-{\mathrm{\ω}}_2/{\mathrm{\ω}}_1)}{{\mathrm{A\ω}}_2-{\mathrm{B\ω}}_1}$

Wherein, ��₁And ��₂The radian frequency being respectively described two operating frequency points, p=tan ��₁l₁,

A=(Z₂-Z₁p²)/[Z₂(Z₁+Z₂) p], q=tan ��₂l₂, B=(Z₂-Z₁q²)/[Z₂(Z₁+Z₂)q]��

Further, in described step B, total electrical length method of calculation of the first and second equivalent transmission line networks are:

��₀=��_Bl₁

The method of calculation of the length d of slow-wave structure minimum unit transmission line section 109 are:

$d=\frac{{\mathrm{\Φ}}_0}{N}\·\frac{Z_B}{Z_c}\·\frac{1}{{\mathrm{\β}}_B}$

Wherein, N is the number of slow-wave structure minimum unit 108, Z_BAnd ��_��Be respectively first or the 2nd equivalent transmission line network natural impedance and propagation constant, Z_CFor the natural impedance of slow-wave structure minimum unit transmission line section 109;

The length d of open circuit transmission line section 107_stubFor:

$d_{stub}=\frac{arctan\left(C_p{\mathrm{\ω}}_0{Z}_{stub}\right)}{{\mathrm{\β}}_0}$

Wherein, Zstub and ��₀Natural impedance and the propagation constant being respectively open circuit transmission line section 107, ��₀For the radian frequency of the minimum frequency in described any two frequencies of correspondence, and C_pFor:

$C_p=\frac{\[1-{\left(\frac{Z_B}{Z_c}\right)}^2\]{\mathrm{sin\β}}_{0}d}{{\mathrm{\ω}}_0{Z}_c\[{\left(\frac{Z_B}{Z_c}\right)}^2{\cos }^2{\mathrm{\β}}_{0}d+{\sin }^2\frac{{\mathrm{\β}}_{0}d}{2}\]}.$

The beneficial effects of the utility model: the utility model utilizes open circuit microstrip line and RLC resonant network in parallel, it is achieved a kind of volume two frequently grade that be little and that accurately realize impedance conversion divides Wilkinson power divider. This circuit structure not only achieves the volume reducing power splitter largely and realizes accurate dual frequency operation, and goes back some smooth dispersion property on high frequency.

Accompanying drawing explanation

Fig. 1 is the domain of embodiment;

Fig. 2 is the equivalent-circuit diagram of embodiment;

Description of reference numerals: 101 first transmission lines, 102 first equivalent transmission lines, 103 the 3rd equivalent transmission lines, 104 the 2nd transmission lines, 105 the 3rd transmission lines, 106RLC series resonant network, 107 slow-wave structure minimum unit open circuit transmission line section, 108 slow-wave structure minimum units, 109 slow-wave structure minimum unit transmission line section, 110 the 2nd equivalent transmission lines, 111 the 4th equivalent transmission lines, 112 corner cuts.

In figure, P1, P2, P3 are respectively the first port, Two-port netwerk and the 3rd port.

Embodiment

A better embodiment of the present utility model, as depicted in figs. 1 and 2, a kind of two frequently grade based on slow-wave structure divides Wilkinson power divider, and operating frequency is 900MHz and 1.8GHz, comprises and is connected with identical load load Z₀The first port, Two-port netwerk and the 3rd port, the the first equivalent transmission line network being made up of the first equivalent transmission line 102 and the 2nd equivalent transmission line 110, the 2nd equivalent transmission line network being made up of the 3rd equivalent transmission line 103 and the 4th equivalent transmission line 111, and RLC series resonant network 106; Described first port is connected to the first equivalent transmission line 102 and the junction of the 2nd equivalent transmission line 110 through the first transmission line 101; The other end of described first equivalent transmission line 102 is connected with the 3rd equivalent transmission line 103; The other end of described 2nd equivalent transmission line 110 is connected with the 4th equivalent transmission line 111; Described Two-port netwerk is connected to the other end of the 3rd equivalent transmission line 103 and the junction of RLC series resonant network 106 through the 2nd transmission line 104; Described 3rd port is connected to the other end of the 4th equivalent transmission line 111 and the junction of the other end of RLC series resonant network 106 through the 3rd transmission line 105; Described first and second equivalent transmission line networks form the slow-wave structure periodically loaded by multiple independent slow-wave structure minimum unit 108; Described slow-wave structure minimum unit 108 forms by transmission line section 109 and open circuit transmission line section 107; The parameter of the slow-wave structure minimum unit 108 of described first and second equivalent transmission line networks is different. All equivalent transmission line corners are corner cut process, and the width of corner cut 112 is that corner connects 1.8 times of equivalent transmission line live width. Except RCL series resonant network adopts discrete device, all the other all adopt microstrip line to realize. Selecting specific inductivity to be 4.61GHz and loss tangent is the FR4 sheet material of 0.011GHz, and sheet metal thickness is 0.8mm and copper thickness is 1/1oz, R_L=100 ��, Z_c=100 ��, Zstub=100 ��, n=1, N1=N2=10, N1, N2 are respectively the number of the slow-wave structure minimum unit 108 of the first and second equivalent transmission line networks, calculating by the method for technical solutions of the utility model, total electrical length of the first and second equivalent transmission line networks is respectively ��₁=60 ��, ��₂=120 ��, Z₁=79.3 ��, Z₂=63 ��, L_x=15.7nH, C_x=1pF, the dstub1=1.2mm of the slow-wave structure minimum unit 108 of the first equivalent transmission line network, the dstub2=2.5mm of the slow-wave structure minimum unit 108 of the 2nd equivalent transmission line network.

Claims (4)

1. one kind is waited point Wilkinson power divider frequently based on the two of slow-wave structure, it is characterized in that: comprise the first port, Two-port netwerk and the 3rd port that are connected with load, the the first equivalent transmission line network being made up of the first equivalent transmission line (102) and the 2nd equivalent transmission line (110), the 2nd equivalent transmission line network being made up of the 3rd equivalent transmission line (103) and the 4th equivalent transmission line (111), and RLC series resonant network (106);

Described first port is connected to the first equivalent transmission line (102) and the junction of the 2nd equivalent transmission line (110) through the first transmission line (101);

The other end of described first equivalent transmission line (102) is connected with the 3rd equivalent transmission line (103);

The other end of described 2nd equivalent transmission line (110) is connected with the 4th equivalent transmission line (111);

Described Two-port netwerk is connected to the other end of the 3rd equivalent transmission line (103) and the junction of RLC series resonant network (106) through the 2nd transmission line (104);

Described 3rd port is connected to the other end of the 4th equivalent transmission line (111) and the junction of the other end of RLC series resonant network (106) through the 3rd transmission line (105);

Described first and second equivalent transmission line networks form the slow-wave structure periodically loaded by multiple independent slow-wave structure minimum unit (108); Described slow-wave structure minimum unit (108) is by transmission line section (109) and open circuit transmission line section (107) composition; The parameter of the slow-wave structure minimum unit (108) of described first and second equivalent transmission line networks is different.

2. two frequently grade the based on slow-wave structure according to claim 1 divides Wilkinson power divider, it is characterised in that: described first port, Two-port netwerk are identical with the resistance of the load that the 3rd port connects, and are designated as Z₀��

3. two frequently grade the based on slow-wave structure according to claim 2 divides Wilkinson power divider, it is characterized in that: the length of described first transmission line (101), the 2nd transmission line (104) and the 3rd transmission line (105) is ��/2, and natural impedance is Z₀��

4. according to claim 1, point Wilkinson power dividers such as the two frequencies based on slow-wave structure described in 2 or 3, it is characterized in that: all equivalent transmission line corners are corner cut process, and the width of corner cut (112) is that corner connects 1.8 times of equivalent transmission line live width.