Miniaturized multifunctional short-wave power amplifier output matcher

Abstract

The utility model discloses a novel short wave power amplifier output matcher which comprises a magnetic core, a first coaxial line, a second coaxial line, a third coaxial line and a cable. Wherein the first coaxial line and the second coaxial line are wound on a magnetic core to form a 1: 4 impedance converter which is used for impedance matching of the output end of the power amplifier; the third coaxial line is wound with a magnetic core to form a balun which is used for balanced-unbalanced conversion of signals at the output end of the power amplifier; the cable winds the magnetic core to form a feed inductor which is used for feeding of the output end of the power amplifier. The structure of the magnetic core assembly at the output end of the power amplification circuit is simplified, the size of the whole power amplification circuit is reduced, the welding efficiency of the power amplification board is improved while the cost is reduced, and the manufacturing efficiency of a radio station is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shortwave communication, in particular to a miniaturized multifunctional shortwave power amplifier output matcher. Background Art

[0002] The power amplifier, referred to as the PA, is the main amplifier of the transmitter's RF front end, converting low-power signals from communications and radar equipment into high-power transmission signals sent to the antenna. The goal of the PA is to increase the signal gain to a high power level without reducing signal quality. It is a core component of the shortwave communication system and plays a very important role in the entire transmission system.

[0003] The power amplifier circuit includes a bias circuit, a feeding circuit, an impedance matching circuit, a balanced-unbalanced conversion circuit, etc. The feeding circuit, output impedance matching circuit, and balanced-unbalanced conversion circuit at the output end of the power amplifier all require magnetic core coils to meet the broadband characteristics of shortwave communication. Therefore, the output end of the power amplifier contains at least one set of feeding magnetic cores, one set of impedance transformer magnetic cores, and a balun for balanced-unbalanced conversion. The complex structure increases the difficulty of debugging the magnetic core components and cannot meet the design requirements of miniaturization of shortwave communication systems. Utility Model Content

[0004] The utility model aims to provide a shortwave power amplifier output matcher which has the advantages of small size, complete functions, high efficiency, simple structure and low cost.

[0005] The technical solution to achieve the purpose of the utility model is: a miniaturized multifunctional short-wave power amplifier output matcher, comprising a magnetic core, a first coaxial line, a second coaxial line, a third coaxial line and a cable;

[0006] The first coaxial line and the second coaxial line are wound with a magnetic core to form a 1:4 impedance converter, which is used for impedance matching at the output end of the power amplifier;

[0007] The third coaxial line is wound with a magnetic core to form a balun, which is used for balanced-unbalanced conversion of the output signal of the power amplifier;

[0008] The cable is wound around the magnetic core to form a feeding inductor, which is used for feeding the output end of the power amplifier.

[0009] Furthermore, the structure of the magnetic core is as follows:

[0010] The magnetic core is in the shape of a rectangular parallelepiped with two circular through holes in the middle, the left side is hole I and the right side is hole II; the plane where one end of the through hole is located is set as surface A, the plane where the other end is located is set as surface B, the bottom of the magnetic core that is in direct contact with the printed circuit board is set as surface C, the side adjacent to hole I is surface D, and the side adjacent to hole II is surface E.

[0011] Furthermore, the B surface of the magnetic core is provided with first to fifth pads, the first pad is provided between hole I and hole II, the second pad is provided at the upper left of hole II, the third pad is provided at the lower left of hole 3, the fourth pad is provided at the upper right of hole I, and the fifth pad is provided at the lower right of hole I.

[0012] Furthermore, a DC blocking capacitor is welded between the second pad and the third pad, and a DC blocking capacitor is welded between the fourth pad and the fifth pad.

[0013] Furthermore, the first coaxial line, the second coaxial line and the third coaxial line have the same structure, which are, from inside to outside, an inner conductor, an insulating medium layer, an outer conductor and an outer insulating layer.

[0014] Furthermore, the first coaxial line and the second coaxial line are wound around a magnetic core to form a 1:4 impedance converter, which is specifically as follows:

[0015] The first coaxial line starts from the A surface of hole I of the magnetic core and enters through hole I, passes through hole I, returns to the A surface of hole I via the D surface, and enters hole I again, and is wound three times repeatedly. After the third turn, it returns to the A surface of hole I and passes through hole I to the B surface again, and the winding of the first coaxial line is completed; the second coaxial line starts from the A surface of hole II and enters through hole II, passes through hole II, returns to the A surface of hole II via the E surface, and enters hole II again, and is wound three times repeatedly. After the third turn, it returns to the A surface of hole II and passes through hole II to the B surface again, and the winding of the second coaxial line is completed;

[0016] The line end of the first coaxial line on the A surface is the input end, and the line end on the B surface is the output end; the line end of the second coaxial line on the A surface is the input end, and the line end on the B surface is the output end;

[0017] The outer conductor of the first coaxial line input end is connected to the inner conductor of the second coaxial line input end, and is connected to one end of the push-pull power amplifier drain; the inner conductor of the first coaxial line input end is connected to the outer conductor of the second coaxial line input end, and is connected to the other end of the push-pull power amplifier drain;

[0018] The inner conductor of the first coaxial line output end is connected to the inner conductor of the second coaxial line output end, and both are connected to the first pad; the outer conductor of the first coaxial line output end is connected to the fourth pad, and the outer conductor of the second coaxial line output end is connected to the second pad.

[0019] Furthermore, the third coaxial line is wound around the magnetic core to form a balun, specifically as follows:

[0020] The third coaxial line enters from the B side of hole I, passes through hole I, passes through the A side, enters hole II, passes through hole II, passes through the B side, and enters hole I again, repeating this process. The third circle passes through the B side of hole II, which is the output end of the third coaxial line.

[0021] The input end of the third coaxial line is located on the B side of the hole I, the inner conductor of the input end of the third coaxial line is connected to the third pad, and the outer conductor of the input end of the third coaxial line is connected to the fifth pad;

[0022] The output end of the third coaxial line is the output port of the balun, which is connected to the output port of the power amplifier circuit during use.

[0023] Furthermore, the cable is wound around the magnetic core to form a feeding inductor, which is specifically as follows:

[0024] One end of the cable is connected to the first solder pad, and the other end enters from the B side of hole II, passes through hole II and enters hole I via the A side, passes through hole I and then enters hole II again via the B side, and repeats this process. The third circle passes through the B side of hole I, which is the power supply end.

[0025] Furthermore, the cable is a cable with an insulation layer.

[0026] Compared with the prior art, the significant advantages of the present invention are: (1) it simplifies the structural composition of the magnetic core assembly at the output end of the power amplifier circuit, thereby reducing the volume of the entire power amplifier circuit; (2) it reduces costs while improving the welding efficiency of the power amplifier board, thereby improving the manufacturing efficiency of the radio station. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the B surface of the magnetic core in the embodiment of the present utility model.

[0028] Figure 2 It is a structural schematic diagram of a power amplifier output circuit in an embodiment of the utility model.

[0029] Figure 3 It is a structural schematic diagram of the magnetic core in an embodiment of the utility model.

[0030] Figure 4 It is a structural schematic diagram of the coaxial line in the embodiment of the utility model. DETAILED DESCRIPTION

[0031] The utility model provides a miniaturized multifunctional short-wave power amplifier output matcher, comprising a magnetic core 1, a first coaxial line 2, a second coaxial line 3, a third coaxial line 4 and a cable 5;

[0032] The first coaxial line 2 and the second coaxial line 3 are wound around the magnetic core 1 to form a 1:4 impedance converter, which is used for impedance matching at the output end of the power amplifier;

[0033] The third coaxial line 4 is wound around the magnetic core 1 to form a balun, which is used for balanced-unbalanced conversion of the output signal of the power amplifier;

[0034] The cable 5 is wound around the magnetic core 1 to form a feeding inductor, which is used to feed the output end of the power amplifier.

[0035] As a specific example, the structure of the magnetic core 1 is as follows:

[0036] The magnetic core 1 is in the shape of a rectangular parallelepiped with two circular through holes in the middle, the left side is hole I6 and the right side is hole II7; the plane where one end of the through hole is located is set as surface A, the plane where the other end is located is set as surface B, the bottom of the magnetic core that is in direct contact with the printed circuit board is set as surface C, the side adjacent to hole I6 is surface D, and the side adjacent to hole II7 is surface E.

[0037] As a specific example, the B surface of the magnetic core 1 is provided with the first to fifth solder pads 1-1 to 1-5, the first solder pad 1-1 is provided between hole I6 and hole II7, the second solder pad 1-2 is provided at the upper left of hole II7, the third solder pad 1-3 is provided at the lower left of hole 3, the fourth solder pad 1-4 is provided at the upper right of hole I6, and the fifth solder pad 1-5 is provided at the lower right of hole I6.

[0038] As a specific example, a DC blocking capacitor is welded between the second pad 1-2 and the third pad 1-3, and a DC blocking capacitor is welded between the fourth pad 1-4 and the fifth pad 1-5.

[0039] As a specific example, the first coaxial line 2, the second coaxial line 3, and the third coaxial line 4 have the same structure, which are, from inside to outside, an inner conductor 2-1, an insulating medium layer 2-2, an outer conductor 2-3, and an outer insulating layer 2-4.

[0040] As a specific example, the first coaxial line 2 and the second coaxial line 3 are wound around the magnetic core 1 to form a 1:4 impedance converter, as follows:

[0041] The first coaxial line 2 enters the through hole I6 from the A surface of the hole I6 of the magnetic core 1, passes through the hole I6, returns to the A surface of the hole I6 via the D surface, and enters the hole I6 again, and is wound three times repeatedly. After the third turn, it returns to the A surface of the hole I6 and passes through the hole I6 again to the B surface, and the winding of the first coaxial line 2 is completed; the second coaxial line 3 enters the through hole II7 from the A surface of the hole II7, passes through the hole II7, returns to the A surface of the hole II7 via the E surface, and enters the hole II7 again, and is wound three times repeatedly. After the third turn, it returns to the A surface of the hole II7 and passes through the hole II7 again to the B surface, and the winding of the second coaxial line 3 is completed;

[0042] The line end of the first coaxial line 2 on the A surface is the input end, and the line end on the B surface is the output end; the line end of the second coaxial line 3 on the A surface is the input end, and the line end on the B surface is the output end;

[0043] The outer conductor 2-3 at the input end of the first coaxial line 2 is connected to the inner conductor 2-1 at the input end of the second coaxial line 3, and is connected to one end of the drain of the push-pull power amplifier; the inner conductor 2-1 at the input end of the first coaxial line 2 is connected to the outer conductor 2-3 at the input end of the second coaxial line 3, and is connected to the other end of the drain of the push-pull power amplifier;

[0044] The inner conductor 2-1 at the output end of the first coaxial line 2 is connected to the inner conductor 2-1 at the output end of the second coaxial line 3, and are connected to the first pad 1-1 together; the outer conductor 2-3 at the output end of the first coaxial line 2 is connected to the fourth pad 1-4, and the outer conductor 2-3 at the output end of the second coaxial line 3 is connected to the second pad 1-2.

[0045] As a specific example, the third coaxial line 4 is wound around the magnetic core 1 to form a balun, as follows:

[0046] The third coaxial line 4 enters from the B side of the hole Ⅰ6, passes through the hole Ⅰ6, passes through the A side, enters the hole Ⅱ7, passes through the hole Ⅱ7, passes through the B side, enters the hole Ⅰ6 again, and repeats this process. The third circle passes through the B side of the hole Ⅱ7, which is the output end of the third coaxial line 4.

[0047] The input end of the third coaxial line 4 is located on the B side of the hole I6, the inner conductor 2-1 of the input end of the third coaxial line 4 is connected to the third pad 1-3, and the outer conductor 2-3 of the input end of the third coaxial line 4 is connected to the fifth pad 1-5;

[0048] The output end of the third coaxial line 4 is the output port of the balun, which is connected to the output port of the power amplifier circuit during use.

[0049] As a specific example, the cable 5 is wound around the magnetic core 1 to form a feeding inductor, as follows:

[0050] One end of the cable 5 is connected to the first pad 1-1, and the other end enters from the B side of hole Ⅱ7, passes through hole Ⅱ7 and enters hole Ⅰ6 via the A side, passes through hole Ⅰ6 and enters hole Ⅱ7 again via the B side, and repeats this process. The third circle passes through the B side of hole Ⅰ6, which is the power supply end.

[0051] As a specific example, the cable 5 is a cable with an insulation layer.

[0052] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] Example

[0054] The output circuit of the power amplifier of the utility model is as follows Figure 2As shown, Vdd is fed by the choke RFC to provide the drain supply voltage. After the drain output passes through the DC blocking capacitors C1 and C2, the output impedance is transformed through the transformer T1 with a magnetic core, and two balanced signals with a phase difference of 180° are output. The balanced signal is then converted into an unbalanced signal through the balun. The unbalanced signal output by the balun is filtered out of high-order harmonics through a filter, and the final signal is output to the next module circuit through the RF output port.

[0055] Combination Figure 1 The utility model discloses a miniaturized multifunctional short-wave power amplifier output matching device, comprising a magnetic core 1, a first coaxial line 2, a second coaxial line 3, a third coaxial line 4 and a cable 5;

[0056] The first coaxial line 2 and the second coaxial line 3 are wound around the magnetic core 1 to form a 1:4 impedance converter, which is used for impedance matching at the output end of the power amplifier;

[0057] The third coaxial line 4 is wound around the magnetic core 1 to form a balun, which is used for balanced-unbalanced conversion of the output signal of the power amplifier;

[0058] The cable 5 is wound around the magnetic core 1 to form a feeding inductor, which is used to feed the output end of the power amplifier.

[0059] Furthermore, combined with Figure 3 , the structure of the magnetic core 1 is as follows:

[0060] The magnetic core 1 is in the shape of a rectangular parallelepiped with two circular through holes in the middle, the left side is hole I6 and the right side is hole II7; the plane where one end of the through hole is located is set as surface A, the plane where the other end is located is set as surface B, the bottom of the magnetic core that is in direct contact with the printed circuit board is set as surface C, the side adjacent to hole I6 is surface D, and the side adjacent to hole II7 is surface E.

[0061] Furthermore, combined with Figure 1 The B surface of the magnetic core 1 is provided with the first to fifth pads 1-1 to 1-5, the first pad 1-1 is provided between the hole I6 and the hole II7, the second pad 1-2 is provided at the upper left of the hole II7, the third pad 1-3 is provided at the lower left of the hole 3, the fourth pad 1-4 is provided at the upper right of the hole I6, and the fifth pad 1-5 is provided at the lower right of the hole I6.

[0062] Furthermore, a DC blocking capacitor is welded between the second welding pad 1-2 and the third welding pad 1-3, and a DC blocking capacitor is welded between the fourth welding pad 1-4 and the fifth welding pad 1-5.

[0063] Furthermore, combined with Figure 4 The first coaxial line 2, the second coaxial line 3 and the third coaxial line 4 have the same structure, which are, from inside to outside, an inner conductor 2-1, an insulating medium layer 2-2, an outer conductor 2-3 and an outer insulating layer 2-4.

[0064] Furthermore, the first coaxial line 2 and the second coaxial line 3 are wound around the magnetic core 1 to form a 1:4 impedance converter, which is specifically as follows:

[0065] The first coaxial line 2 enters the through hole I6 from the A surface of the hole I6 of the magnetic core 1, passes through the hole I6, returns to the A surface of the hole I6 via the D surface, and enters the hole I6 again, and is wound three times repeatedly. After the third turn, it returns to the A surface of the hole I6 and passes through the hole I6 again to the B surface, and the winding of the first coaxial line 2 is completed; the second coaxial line 3 enters the through hole II7 from the A surface of the hole II7, passes through the hole II7, returns to the A surface of the hole II7 via the E surface, and enters the hole II7 again, and is wound three times repeatedly. After the third turn, it returns to the A surface of the hole II7 and passes through the hole II7 again to the B surface, and the winding of the second coaxial line 3 is completed;

[0066] The line end of the first coaxial line 2 on the A surface is the input end, and the line end on the B surface is the output end; the line end of the second coaxial line 3 on the A surface is the input end, and the line end on the B surface is the output end;

[0067] The outer conductor 2-3 at the input end of the first coaxial line 2 is connected to the inner conductor 2-1 at the input end of the second coaxial line 3, and is connected to one end of the drain of the push-pull power amplifier; the inner conductor 2-1 at the input end of the first coaxial line 2 is connected to the outer conductor 2-3 at the input end of the second coaxial line 3, and is connected to the other end of the drain of the push-pull power amplifier;

[0068] The inner conductor 2-1 at the output end of the first coaxial line 2 is connected to the inner conductor 2-1 at the output end of the second coaxial line 3, and are connected to the first pad 1-1 together; the outer conductor 2-3 at the output end of the first coaxial line 2 is connected to the fourth pad 1-4, and the outer conductor 2-3 at the output end of the second coaxial line 3 is connected to the second pad 1-2.

[0069] Furthermore, the third coaxial line 4 is wound around the magnetic core 1 to form a balun, specifically as follows:

[0070] The third coaxial line 4 enters from the B side of the hole Ⅰ6, passes through the hole Ⅰ6, passes through the A side, enters the hole Ⅱ7, passes through the hole Ⅱ7, passes through the B side, enters the hole Ⅰ6 again, and repeats this process. The third circle passes through the B side of the hole Ⅱ7, which is the output end of the third coaxial line 4.

[0071] The input end of the third coaxial line 4 is located on the B side of the hole I6, the inner conductor 2-1 of the input end of the third coaxial line 4 is connected to the third pad 1-3, and the outer conductor 2-3 of the input end of the third coaxial line 4 is connected to the fifth pad 1-5;

[0072] The output end of the third coaxial line 4 is the output port of the balun, which is connected to the output port of the power amplifier circuit during use.

[0073] Furthermore, the cable 5 is wound around the magnetic core 1 to form a feeding inductor, as follows:

[0074] One end of the cable 5 is connected to the first pad 1-1, and the other end enters from the B side of hole Ⅱ7, passes through hole Ⅱ7 and enters hole Ⅰ6 via the A side, passes through hole Ⅰ6 and enters hole Ⅱ7 again via the B side, and repeats this process. The third circle passes through the B side of hole Ⅰ6, which is the power supply end.

[0075] Furthermore, the cable 5 is a cable with an insulation layer.

[0076] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A miniaturized multifunctional shortwave power amplifier output matching device, characterized in that: It comprises a magnetic core (1), a first coaxial line (2), a second coaxial line (3), a third coaxial line (4) and a cable (5); The first coaxial line (2) and the second coaxial line (3) are wound around the magnetic core (1) to form a 1:4 impedance converter, which is used for impedance matching at the output end of a power amplifier; The third coaxial line (4) is wound around the magnetic core (1) to form a balun, which is used for balanced-unbalanced conversion of the signal at the output end of the power amplifier; The cable (5) is wound around the magnetic core (1) to form a feeding inductor, which is used for feeding the output end of the power amplifier.

2. The miniaturized multifunctional shortwave power amplifier output matching device according to claim 1, characterized in that: The structure of the magnetic core (1) is specifically as follows: The magnetic core (1) is in the shape of a rectangular parallelepiped, with two circular through holes in the middle, the left side being hole I (6) and the right side being hole II (7); the plane where one end of the through hole is located is set as surface A, the plane where the other end is located is set as surface B, the bottom of the magnetic core directly in contact with the printed circuit board is set as surface C, the side surface adjacent to hole I (6) is set as surface D, and the side surface adjacent to hole II (7) is set as surface E.

3. The miniaturized multifunctional shortwave power amplifier output matching device according to claim 2, characterized in that: The B surface of the magnetic core (1) is provided with a first solder pad (1-1), a second solder pad (1-2), a third solder pad (1-3), a fourth solder pad (1-4) and a fifth solder pad (1-5); the first solder pad (1-1) is provided between the hole I (6) and the hole II (7); the second solder pad (1-2) is provided at the upper left of the hole II (7); the third solder pad (1-3) is provided at the lower left of the hole II (7); the fourth solder pad (1-4) is provided at the upper right of the hole I (6); and the fifth solder pad (1-5) is provided at the lower right of the hole I (6).

4. The miniaturized multifunctional shortwave power amplifier output matching device according to claim 3, characterized in that: A DC blocking capacitor is welded between the second welding pad (1-2) and the third welding pad (1-3), and a DC blocking capacitor is welded between the fourth welding pad (1-4) and the fifth welding pad (1-5).

5. The miniaturized multifunctional shortwave power amplifier output matching device according to claim 1, characterized in that: The first coaxial line (2), the second coaxial line (3) and the third coaxial line (4) have the same structure, which are, from inside to outside, an inner conductor (2-1), an insulating medium layer (2-2), an outer conductor (2-3) and an outer insulating layer (2-4).

6. The miniaturized multifunctional shortwave power amplifier output matching device according to claim 1, characterized in that: The cable (5) is a cable with an insulation layer.

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