CN201408832Y - Balun impedance converter used for radio frequency push-pull power amplifier - Google Patents
Balun impedance converter used for radio frequency push-pull power amplifier Download PDFInfo
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- CN201408832Y CN201408832Y CN200920107010XU CN200920107010U CN201408832Y CN 201408832 Y CN201408832 Y CN 201408832Y CN 200920107010X U CN200920107010X U CN 200920107010XU CN 200920107010 U CN200920107010 U CN 200920107010U CN 201408832 Y CN201408832 Y CN 201408832Y
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Abstract
The utility model relates to a balun impedance converter used for a radio frequency push-pull power amplifier, belonging to the technical field of radio frequency circuits. The balun impedance converter comprises a U-shaped coaxial cable and two straight reach coaxial cables with same length, wherein two straight line sections of the U-shaped coaxial cable are respectively and parallelly overlapped and contacted with the two straight reach coaxial cables, and horizontally installed on a printed circuit board, and at least outer conductors at two mutually contacted ends are welded and connectedwith each other; the balun impedance converter further comprises two mutually insulated leads, each lead causes an inner conductor at one end of the U-shaped coaxial cable to be connected with an inner conductor at the end of the straight reach coaxial cable which is arranged at an opposite side of the U-shaped coaxial cable; the outer conductors at two ends of the U-shaped coaxial cable are twolow resistance balance ports; one inner conductor of other two ends of the straight reach coaxial cables is grounded, and the other one thereof is a high resistance imbalance port; and the middle point of the outer conductor of the U-shaped coaxial cable is connected with a direct current power supply and grounded by a capacitor in a radio-frequency manner. The balun impedance converter has symmetrical structure, small occupied space, convenient processing and good duplication, and greatly improves the electrical performance.
Description
Technical field
The utility model belongs to the radio circuit technical field, particularly is used for the design of the Ba Lun impedance transformer of radio-frequency push-pull power amplifier.
Background technology
Radio-frequency power amplifier is widely used in fields such as communication, broadcasting, radar, industrial processes, Medical Instruments and scientific research.The radio frequency high-power amplifier generally adopts the form of recommending.Radio-frequency push-pull power amplifier by recommend power transistor, with recommend input matching network, output matching network and power supply biasing circuit four parts that power transistor links to each other and form, wherein, recommend power transistor and be directly installed on the metal heat sink surface, input matching network, output matching network and power supply biasing circuit are produced on the printed circuit board, and these printed circuit boards are installed in and recommend the same metal heat sink of power transistor surface.In input matching network and output matching network, all contain Ba Lun impedance transformer (Balance to UnbalanceTransformer is called for short Balun Transformer).Ba Lun impedance transformer in the input matching network is converted to balance (or claiming difference) signal of low-resistance with the unbalanced signal of high resistant, and delivers to the input of radio-frequency (RF) power transistor.Ba Lun impedance transformer in the output matching network is the unbalanced signal of high resistant, and delivers to the output of radio-frequency power amplifier low-resistance balance (or claiming difference) conversion of signals of radio-frequency (RF) power transistor output.Ba Lun impedance transformer in the input and output matching network can be designed to different impedance transformation ratios according to different power amplifier needs, as 4: 1,9: 1,16: 1 etc.Ba Lun impedance transformer in the input and output matching network can adopt identical structure, also can adopt different structures.Compare with the Ba Lun impedance transformer in the input matching network, Ba Lun impedance transformer in the output matching network requires to bear higher power, the general coaxial cable that adopts is realized, and the power that the requirement of the Ba Lun impedance transformer in the input matching network is born is less, can adopt thinner coaxial cable or other structure to realize.
The theory structure of existing a kind of 4: 1 Ba Lun impedance transformers as shown in Figure 1, it is divided into Ba Lun (Balance toUnbalance) and impedance transformer two independent parts, constitute Ba Lun by a coaxial cable 11 and realize uneven conversion, constitute of the conversion of impedance transformer realization balance high resistant to the balance low-resistance by the coaxial cable 12,13 of two equal length to balance.The inner wire of coaxial cable 11 inputs 111 is uneven port, outer conductor ground connection; The inner wire of coaxial cable 11 outputs 112 and outer conductor connect two inner wires of the input 121,131 of coaxial cable 12,13 respectively, and two outer conductors of the input 121,131 of coaxial cable 12,13 directly link to each other.The inner wire of coaxial cable 12 outputs 122 links to each other with the outer conductor of coaxial cable 13 outputs 132, as a low-resistance balance ports; The inner wire of coaxial cable 13 outputs 132 links to each other with the outer conductor of coaxial cable 12 outputs 122, as another low-resistance balance ports.The length of the coaxial cable 11 of this Ba Lun impedance transformer and coaxial cable 12,13 generally long (being generally 1/4 wavelength), each root coaxial cable is all made helical coil and is stood on the printed circuit board.The shape and the locus of the performance of this Ba Lun impedance transformer and coaxial cable helical coil are closely related, and replicability is poor, and it is big to take up room, and structure is not compact; Coaxial cable is used manyly, the cost height.
The theory structure of existing another kind of 4: 1 Ba Lun impedance transformers as shown in Figure 2, it is made of the coaxial cable 21 that a level is installed in close coiled two circle on the printed circuit board, lower floor's coaxial cable circle and wiring board join.The two ends of this coaxial cable are in same direction, and wherein the inner wire of an end 211 is a high-resistance unbalanced port, the inner wire ground connection of the other end 212; Peel off the outer conductor of equal length at two circles that this coaxial cable two ends rightabout is stacked, only stay dielectric layer and inner wire.The contact site welding of two circle coaxial cable outer conductors connects together.Peelling off two the outer conductor terminations 213,214 that occur behind the part outer conductor is two low-resistance balance ports.The mid point of one section U-shaped coaxial cable 215 on the uneven port direction connects DC power supply and passes through capacitive RF ground connection.The coaxial cable that this Ba Lun impedance transformer is installed in close coiled two circle on the printed circuit board with a level has been finished simultaneously and has been equilibrated to conversion uneven and that high resistant arrives low-resistance.The inner wire of the coaxial cable of this Ba Lun impedance transformer around two the circle, a termination unbalanced signal, other end ground connection is the primary coil of Ba Lun impedance transformer, the number of turns is 2; The outer conductor welding of two circle coaxial cables of this Ba Lun impedance transformer connects together, and the two ends of outer conductor are two balance ports.Only from outer conductor, it has become a circle, is the secondary coil of Ba Lun impedance transformer, and the number of turns is 1.The mid point of outer conductor is by capacitive RF ground connection.In principle, this radio frequency earth point must be the electrical midpoint of secondary coil, and the signal amplitude that could guarantee two balance ports is identical and phase place is opposite.Because the not strict symmetry of structure of the outer conductor of this Ba Lun impedance transformer standard coaxial cable, its U-shaped part is not parallel with the wiring board of its below, and from electromagnetic field distribution, the structural mid point of outer conductor is not its mid point on electric.Mid point on its electrical equipment be difficult to determine, and since equivalence to be the outer conductor of secondary coil shorter relatively, the position of electrical midpoint is more responsive.
Compare with Ba Lun impedance transformer shown in Figure 1, this structure takes up room little, compact conformation.But the structure of this Ba Lun impedance transformer is also not exclusively symmetrical, U-shaped coaxial section 215 on the direction of uneven input port is not parallel with wiring board, its mid point is difficult to determine, this can worsen the amplitude balance and the anti-phase performance of phase place of Ba Lun impedance transformer balance ports signal, thereby influences the technical characteristic of radio-frequency power amplifier; The coaxial cable of this Ba Lun impedance transformer has two sections will peel off outer conductor, and is close then around two circles, processing difficulties, and replicability is bad.
Summary of the invention
The purpose of this utility model is for overcoming the weak point of prior art, a kind of Ba Lun impedance transformer that is used for radio-frequency push-pull power amplifier of new construction is proposed, the utility model not only has compact conformation, characteristics little, easy to process, that replicability is good take up room, and its symmetrical configuration, thereby its electrical property is greatly improved.
A kind of Ba Lun impedance transformer that is used for radio-frequency push-pull power amplifier that the utility model proposes comprises the one group of coaxial cable that is installed on the printed circuit board; It is characterized in that described one group of coaxial cable comprises a U-shaped coaxial cable and two straight section coaxial cables that length is identical, these two straight section coaxial cable levels are installed on the printed circuit board; Described U-shaped coaxial cable horizontal stacking above two straight section coaxial cables, parallel with the outer conductor of the two straight section coaxial cables respectively overlapping contact of the outer conductor of two straightways of this U-shaped coaxial cable, and the two ends position that is in contact with one another at least is weldingly connected; Described Ba Lun impedance transformer also comprises the lead of two mutually insulateds, and described every lead is with the inner wire of a termination of this U-shaped coaxial cable be connected with the inner wire of the straight section coaxial cable termination of this termination offside (making the inner wire of U-shaped coaxial cable and the inner wire of straight section coaxial cable connect into a conductor); The outer conductor of two terminations of described U-shaped coaxial cable (also being the outer conductor with two terminations of its two straight section coaxial cables in the same way) is two low-resistance balance ports; An inner wire ground connection in two other termination of these two straight section coaxial cables, another inner wire is as high-resistance unbalanced port; The mid point of this U-shaped coaxial cable outer conductor connects DC power supply and passes through capacitive RF ground connection.
The lead of above-mentioned two mutually insulateds can with two outer wrapping insulating barriers or by air-insulated metal connecting line or metal connecting sheet; Also can adopt a two sided pcb, print a metal conduction band respectively, and the inner wire of U-shaped coaxial cable termination, straight section coaxial cable termination is fixed on this two sided pcb corresponding metal conduction band two ends on two surfaces of this printed circuit board.
The another kind that the utility model proposes is used for the Ba Lun impedance transformer of radio-frequency push-pull power amplifier, comprises the one group of coaxial cable that is installed on the printed circuit board; It is characterized in that described one group of coaxial cable comprises the U-shaped coaxial cable and two straight section coaxial cables that length is identical that N root length is identical, shape is identical, these two straight section coaxial cable levels are installed on the printed circuit board; Described N root U-shaped coaxial cable level successively overlaps two straight section coaxial cable tops, the parallel overlapping contact of the outer conductor of two straightways of orlop U-shaped coaxial cable with the outer conductor of two straight section coaxial cables, and the position, termination that is in contact with one another of the outer conductor of the outer conductor of the position, termination of the outer conductor that is in contact with one another of each root U-shaped coaxial cable and orlop U-shaped coaxial cable and two straight section coaxial cables is weldingly connected at least; Described Ba Lun impedance transformer also comprises the lead of N+1 root mutually insulated, each lead links to each other the inner wire of a termination of straight section coaxial cable respectively with the inner wire of orlop U-shaped coaxial cable offside termination, the inner wire of this another termination of straight section coaxial cable is linked to each other with the inner wire of the superiors U-shaped coaxial cable offside terminations; The inner wire of this two adjacent U-shaped coaxial cable offside termination is linked to each other; And the inner wire that makes each termination only connects once (even the inner wire of all inner wires of N root U-shaped coaxial cable and straight section coaxial cable connects into a conductor); The outer conductor of two groups of terminations that the welding of all U-shaped coaxial cables connects together (also being the outer conductor with two terminations of its two straight section coaxial cables in the same way) is two low-resistance balance ports; An inner wire ground connection in two other termination of these two straight section coaxial cables, another inner wire is as high-resistance unbalanced port; The mid point of these all U-shaped coaxial cable outer conductors that are welded together connects DC power supply and by capacitive RF ground connection, described N is a positive integer.
The lead of above-mentioned N+1 root mutually insulated can with N+1 root outer wrapping insulating barrier or by air-insulated metal connecting line or metal connecting sheet; Also can adopt a two sided pcb, print the N+1 root metal conduction band of mutually insulated on two surfaces of this printed circuit board, and the inner wire of U-shaped coaxial cable termination, straight section coaxial cable termination is fixed on this two sided pcb corresponding metal conduction band two ends.
The radical of U-shaped coaxial cable is relevant with impedance transformation ratio in the utility model Ba Lun impedance transformer, and 1 counterpart impedance conversion ratio is 4: 1, and 2 counterpart impedance conversion ratios are 9: 1, and 3 counterpart impedance conversion ratios are 16: 1, or the like.The variation of radical does not change the basic structural feature of above-mentioned Ba Lun impedance transformer, when being U-shaped coaxial cable of every increase, increases by a strip metal connecting line.
Characteristics of the present utility model and beneficial effect:
Ba Lun impedance transformer of the present utility model adopts one group of coaxial cable to finish simultaneously and equilibrates to conversion uneven and that high resistant arrives low-resistance, and the area that takies printed circuit board is little, and is simple in structure;
All coaxial cables of Ba Lun impedance transformer of the present utility model all are installed in parallel on the printed circuit board, take highly little, compact conformation;
Ba Lun impedance transformer of the present utility model is made of the coaxial cable of one group of shape standard and the lead of mutually insulated, and they all are easy to Precision Machining, and replicability is good, is convenient to produce in enormous quantities, reduces cost;
The structural symmetry of Ba Lun impedance transformer of the present utility model is good, and the anti-phase property of the amplitude balance of two balance ports signals and phase place all is improved, thereby the efficient of radio-frequency power amplifier and even-order harmonic rejection are improved.
Description of drawings
Fig. 1 is the theory structure schematic diagram of existing a kind of 4: 1 Ba Lun impedance transformers.
Fig. 2 is the structural representation of existing another kind of 4: 1 Ba Lun impedance transformers.
Fig. 3 is embodiment 1 structural representation of Ba Lun impedance transformer of the present utility model.
Fig. 4 is embodiment 2 structural representations of Ba Lun impedance transformer of the present utility model.
Fig. 5 is embodiment 3 structural representations of Ba Lun impedance transformer of the present utility model.
Embodiment
A kind of Ba Lun impedance transformer that is used for radio-frequency push-pull power amplifier that the utility model proposes reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
Embodiment 1 is for being used for 4: 1 Ba Lun impedance transformers of radio-frequency push-pull power amplifier, and its structure as shown in Figure 3; This embodiment comprises one group of coaxial cable and two sided pcb 31 that is installed on the printed circuit board (not shown), described one group of coaxial cable comprises a U-shaped coaxial cable 32 and two straight section coaxial cables 33,34 that length is identical, and these two straight section coaxial cables, 33,34 levels are installed on the printed circuit board; U-shaped coaxial cable horizontal stacking is above two straight section coaxial cables, the outer conductor of two straightways 321,322 of this U-shaped coaxial cable is in contact with one another with the outer conductor of two straight section coaxial cables 33,34 respectively, and the two ends outer conductor of Jie Chu U-shaped coaxial cable and the two ends outer conductor that contacts with two straight section coaxial cables weld together (if stability of structure can be more strengthened in partly or entirely welding together of contact site) at least; Two surfaces of this two sided pcb 31 respectively are provided with a line 311,312, and wherein, line 311 is connected these U-shaped coaxial cable termination 323 inner wires with the inner wire of the straight section coaxial cable termination 331 of opposite side; Line 312 is with the inner wire of this U-shaped coaxial cable termination 324 be connected with the inner wire of the straight section coaxial cable termination 341 of opposite side (making the inner wire of U-shaped coaxial cable and the inner wire of straight section coaxial cable connect into a conductor).The outer conductor of two terminations 323,324 of U-shaped coaxial cable (also being the outer conductor with two terminations of its two straight section coaxial cables in the same way) is two low-resistance balance ports; The inner wire ground connection of the another one termination 332 of straight section coaxial cable 33, the inner wire of the another one termination 342 of straight section coaxial cable 34 is as high-resistance unbalanced port; The mid point 325 of U-shaped coaxial cable 32 outer conductors (on the centre symmetry line of Ba Lun impedance transformer coaxial cable outer conductor) connects DC power supply and passes through capacitive RF ground connection.
It is 4: 1 that present embodiment adopts 1 U-shaped coaxial cable counterpart impedance conversion ratio, U-shaped coaxial cable and two straight section coaxial cables all adopt the half firm coaxial cable in 25 Europe, the internal diameter size of its outer conductor is relevant with the radio-frequency power size of being passed through, and power is big more, and the internal diameter of outer conductor is thick more; The length of straight section coaxial cable is relevant with operating frequency with U-shaped coaxial cable width, and operating frequency is high more, and length and width dimensions are more little.
Two sided pcb in the present embodiment can be directly with two outer wrapping insulating barriers or replace by air-insulated metal connecting line or metal connecting sheet, be that every lead directly is connected the inner wire of a termination of this U-shaped coaxial cable with the inner wire of the straight section coaxial cable termination of this termination offside, constitute an inner wire.
The Ba Lun impedance transformer of present embodiment is used in the output matching network of FM broadcasting 550W push-pull power amplifier, the internal diameter of the half firm coaxial cable outer conductor in 25 Europe is 3mm, the length of straight section coaxial cable is 20mm, the width of U-shaped coaxial cable is 10mm, printed circuit board adopts the thick two sided pcb of 1.5mm, drain efficiency is all greater than 80% in 87.5MHz arrives the whole frequency of 108MHz for amplifier, and representative value is 83%, and second harmonic inhibition degree is all greater than 30dB.
Embodiment 2 is for being used for 9: 1 Ba Lun impedance transformers of radio-frequency push-pull power amplifier.Present embodiment is that length of increase is identical on the U-shaped coaxial cable of embodiment 1 with the difference of embodiment 1, the U-shaped coaxial cable that shape is identical, two U-shaped coaxial cables overlap two straight section coaxial cable tops, two straightways of two U-shaped coaxial cables and two parallel overlaping of straight section coaxial cable, the outer conductor of two U-shaped coaxial cables is in contact with one another, the outer conductor at the straightway position of lower floor's U-shaped coaxial cable and the outer conductor of two straight section coaxial cables are in contact with one another, and the two groups of termination outer conductors of Jie Chu two U-shaped coaxial cables and the two ends outer conductor of two straight section coaxial cable contacts weld together (if stability of structure can be more strengthened in partly or entirely welding together of contact site) respectively at least.
Another difference of present embodiment and embodiment 1 is that two surfaces of printed circuit board 41 are provided with three lines 411,412 and 413, and as shown in Figure 4, wherein, line 411,412 is on a surface, and line 413 is on another surface; Line 411 links to each other the inner wire of a termination 421 of the straight section coaxial cable inner wire with lower floor U-shaped coaxial cable offside termination 432; Line 413 links to each other the inner wire of another termination 422 of straight section coaxial cable with the inner wire of U-shaped coaxial cable offside termination, upper strata 441; Line 412 links to each other another termination 442 of the U-shaped coaxial cable on upper strata inner wire with the offside termination 431 of lower floor U-shaped coaxial cable; The inner wire of each termination only connects once (making the inner wire of two U-shaped coaxial cables and the inner wire of straight section coaxial cable connect into a conductor).
Similar to Example 1, the outer conductor of two groups of terminations of the U-shaped coaxial cable that two of present embodiments are welded together in twos (also being the outer conductor with two terminations of its two straight section coaxial cables in the same way) is two low-resistance balance ports; An inner wire ground connection in two other termination of these two straight section coaxial cables, another inner wire is as high-resistance unbalanced port; The mid point of these all U-shaped coaxial cable outer conductors that are welded together connects DC power supply and passes through capacitive RF ground connection.
It is 9: 1 that present embodiment adopts 2 U-shaped coaxial cable counterpart impedance conversion ratios.
Embodiment 3 is for being used for 16: 1 Ba Lun impedance transformers of radio-frequency push-pull power amplifier.Present embodiment and the difference of embodiment 2 are that to increase a length on the U-shaped coaxial cable of embodiment 2 more identical, the U-shaped coaxial cable that shape is identical, three U-shaped coaxial cables overlap two straight section coaxial cable tops, two straightways of three U-shaped coaxial cables and two parallel overlaping of straight section coaxial cable, the outer conductor of adjacent two U-shaped coaxial cables is in contact with one another, the outer conductor at the straightway position of orlop U-shaped coaxial cable and the outer conductor of two straight section coaxial cables are in contact with one another, and two groups of terminations of Jie Chu three U-shaped coaxial cables and the two ends position that contacts with two straight section coaxial cables weld together (if stability of structure can be more strengthened in partly or entirely welding together of contact site) at least.
Another difference of embodiment 3 and embodiment 2 is that two surfaces of printed circuit board 51 are provided with four lines 511,512,513 and 514, and as shown in Figure 5, wherein, line 511,512,513 is on a surface, and line 414 is on another surface; Line 511 links to each other the inner wire of a termination 521 of the straight section coaxial cable inner wire with lower floor U-shaped coaxial cable offside termination 532; Line 514 links to each other the inner wire of another termination 522 of straight section coaxial cable with the inner wire of U-shaped coaxial cable offside termination, upper strata 551; Line 512 links to each other termination 542 of the U-shaped coaxial cable in middle level inner wire with the offside termination 531 of lower floor U-shaped coaxial cable; Line 513 links to each other another termination 541 of the U-shaped coaxial cable in middle level with offside termination 552 inner wires of upper strata U-shaped coaxial cable; The inner wire of each termination only connects once (even the inner wire of all inner wires of three U-shaped coaxial cables and straight section coaxial cable connects into a conductor).
Similar to Example 2, the outer conductor of two groups of terminations of the U-shaped coaxial cable that two of present embodiments are welded together in twos (also being the outer conductor with two terminations of its two straight section coaxial cables in the same way) is two low-resistance balance ports; An inner wire ground connection in two other termination of these two straight section coaxial cables, another inner wire is as high-resistance unbalanced port; The mid point of these all U-shaped coaxial cable outer conductors that are welded together connects DC power supply and passes through capacitive RF ground connection.
It is 16: 1 that present embodiment adopts 3 U-shaped coaxial cable counterpart impedance conversion ratios.
Two sided pcb in the foregoing description 2,3 also can be directly with two outer wrapping insulating barriers or replace by air-insulated metal connecting line or metal connecting sheet, be that each root lead directly is connected the inner wire of a termination of each U-shaped coaxial cable with the adjacent U-shaped coaxial cable of this termination offside or the inner wire of straight section coaxial cable termination, constitute a conductor.
Also can easily change impedance transformation ratio according to the foregoing description, to adapt to needs of different applications by the radical that increases the U-shaped coaxial cable.
The utility model the foregoing description does not limit the protection range of technical solutions of the utility model just in order to illustrate architectural feature of the present utility model with this.Any change that every technical scheme of protecting according to the utility model is done the foregoing description all should belong to protection category of the present utility model.
Claims (6)
1, a kind of Ba Lun impedance transformer that is used for radio-frequency push-pull power amplifier comprises the one group of coaxial cable that is installed on the printed circuit board; It is characterized in that described one group of coaxial cable comprises a U-shaped coaxial cable and two straight section coaxial cables that length is identical, these two straight section coaxial cable levels are installed on the printed circuit board; Described U-shaped coaxial cable horizontal stacking above two straight section coaxial cables, parallel with the outer conductor of the two straight section coaxial cables respectively overlapping contact of the outer conductor of two straightways of this U-shaped coaxial cable, and the two ends position that is in contact with one another at least is weldingly connected; Described Ba Lun impedance transformer also comprises the lead of two mutually insulateds, and described every lead is connected the inner wire of a termination of this U-shaped coaxial cable with the inner wire of the straight section coaxial cable termination of this termination offside; The outer conductor of two terminations of described U-shaped coaxial cable is two low-resistance balance ports; An inner wire ground connection in two other termination of these two straight section coaxial cables, another inner wire is as high-resistance unbalanced port; The mid point of this U-shaped coaxial cable outer conductor connects DC power supply and passes through capacitive RF ground connection.
2, Ba Lun impedance transformer as claimed in claim 1 is characterized in that, the lead of described two mutually insulateds adopt two outer wrapping insulating barriers or by air-insulated metal connecting line or metal connecting sheet.
3, Ba Lun impedance transformer as claimed in claim 1, it is characterized in that, the lead of described two mutually insulateds adopts a two sided pcb, two surfaces at this printed circuit board are printed with a metal conduction band respectively, and the inner wire of described U-shaped coaxial cable termination, straight section coaxial cable termination is fixed on this two sided pcb corresponding metal conduction band two ends.
4, a kind of Ba Lun impedance transformer that is used for radio-frequency push-pull power amplifier comprises the one group of coaxial cable that is installed on the printed circuit board; It is characterized in that described one group of coaxial cable comprises the U-shaped coaxial cable and two straight section coaxial cables that length is identical that N root length is identical, shape is identical, these two straight section coaxial cable levels are installed on the printed circuit board; Described N root U-shaped coaxial cable level successively overlaps two straight section coaxial cable tops, the parallel overlapping contact of the outer conductor of two straightways of orlop U-shaped coaxial cable with the outer conductor of two straight section coaxial cables, and the position, termination that is in contact with one another of the outer conductor of the outer conductor of the position, termination of the outer conductor that is in contact with one another of each root U-shaped coaxial cable and orlop U-shaped coaxial cable and two straight section coaxial cables is weldingly connected at least; Described Ba Lun impedance transformer also comprises the lead of N+1 root mutually insulated, each lead links to each other the inner wire of a termination of straight section coaxial cable respectively with the inner wire of orlop U-shaped coaxial cable offside termination, the inner wire of this another termination of straight section coaxial cable is linked to each other with the inner wire of the superiors U-shaped coaxial cable offside terminations; The inner wire of this two adjacent U-shaped coaxial cable offside termination is linked to each other; And the inner wire of each termination is only connected once; The outer conductor of two groups of terminations that the welding of all U-shaped coaxial cables connects together (also being the outer conductor with two terminations of its two straight section coaxial cables in the same way) is two low-resistance balance ports; An inner wire ground connection in two other termination of these two straight section coaxial cables, another inner wire is as high-resistance unbalanced port; The mid point of these all U-shaped coaxial cable outer conductors that are welded together connects DC power supply and by capacitive RF ground connection, described N is a positive integer.
5, Ba Lun impedance transformer as claimed in claim 4 is characterized in that, the lead of described N+1 root mutually insulated adopt N+1 root outer wrapping insulating barrier or by air-insulated metal connecting line or metal connecting sheet.
6, Ba Lun impedance transformer as claimed in claim 4, it is characterized in that, the lead of described N+1 root mutually insulated adopts a two sided pcb, be printed with the N+1 root metal conduction band of mutually insulated on two surfaces of this printed circuit board, the inner wire of described U-shaped coaxial cable termination, straight section coaxial cable termination is fixed on this two sided pcb corresponding metal conduction band two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920107010XU CN201408832Y (en) | 2009-05-18 | 2009-05-18 | Balun impedance converter used for radio frequency push-pull power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920107010XU CN201408832Y (en) | 2009-05-18 | 2009-05-18 | Balun impedance converter used for radio frequency push-pull power amplifier |
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| CN201408832Y true CN201408832Y (en) | 2010-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920107010XU Expired - Fee Related CN201408832Y (en) | 2009-05-18 | 2009-05-18 | Balun impedance converter used for radio frequency push-pull power amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599743B (en) * | 2009-05-18 | 2011-06-08 | 北京瑞夫艾电子有限公司 | Baran impedance converter for radio frequency pull-push power amplifier |
| CN103378391A (en) * | 2012-04-27 | 2013-10-30 | Ge医疗系统环球技术有限公司 | Balun |
| CN107743684A (en) * | 2016-08-10 | 2018-02-27 | 电子科技大学 | A kind of difference amplifier |
| CN114678673A (en) * | 2022-04-02 | 2022-06-28 | 西安电子科技大学 | Broadband balun loaded with ferrite magnetic ring |
-
2009
- 2009-05-18 CN CN200920107010XU patent/CN201408832Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599743B (en) * | 2009-05-18 | 2011-06-08 | 北京瑞夫艾电子有限公司 | Baran impedance converter for radio frequency pull-push power amplifier |
| CN103378391A (en) * | 2012-04-27 | 2013-10-30 | Ge医疗系统环球技术有限公司 | Balun |
| CN103378391B (en) * | 2012-04-27 | 2016-08-31 | Ge医疗系统环球技术有限公司 | A kind of balun |
| CN107743684A (en) * | 2016-08-10 | 2018-02-27 | 电子科技大学 | A kind of difference amplifier |
| CN107743684B (en) * | 2016-08-10 | 2020-11-03 | 电子科技大学 | Differential amplifier |
| CN114678673A (en) * | 2022-04-02 | 2022-06-28 | 西安电子科技大学 | Broadband balun loaded with ferrite magnetic ring |
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