CN218958890U - Short wave 20W power amplifier impedance matching circuit - Google Patents
Short wave 20W power amplifier impedance matching circuit Download PDFInfo
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- CN218958890U CN218958890U CN202320017657.3U CN202320017657U CN218958890U CN 218958890 U CN218958890 U CN 218958890U CN 202320017657 U CN202320017657 U CN 202320017657U CN 218958890 U CN218958890 U CN 218958890U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model relates to the technical field of electronic circuits, in particular to an impedance matching circuit of a shortwave 20W power amplifier. The utility model provides an impedance matching circuit of a shortwave 20W power amplifier, which adopts the impedance transformation design of a transmission line transformer and comprises a double-hole magnetic core, a first coaxial cable and a second coaxial cable; the section of the double-hole magnetic core is 8-shaped; the first coaxial cables are respectively wound on two holes of the double-hole magnetic core and the magnetic core walls which are far away from each other, and the second coaxial cables are wound on the magnetic core between the two holes of the double-hole magnetic core. The transmission line transformer is formed by winding a transmission line around a magnetic core, and thus can be regarded as a product of a combination of a lumped parameter transformer and a distributed parameter transmission line segment impedance transformer. Therefore, the applicable frequency range is wide, the relative bandwidth is large, the size is small, the power amplifier is realized, and the power amplifier has higher drain electrode efficiency when in use.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to an impedance matching circuit of a shortwave 20W power amplifier.
Background
The impedance matching device can be largely classified into a conventional lumped parameter transformer, another is a transmission line impedance transformer of distributed parameters, and a third is an impedance transformation of the transmission line transformer. Conventional lumped parameter transformers are constructed by winding a coil around a magnetic core, and are characterized by small dimensions (relative to free space of operating frequency, wavelength) and a bandwidth factor (i.e., relative bandwidth) that is much larger than a distributed-parameter transmission line impedance transformer. However, in order to increase absolute bandwidth, one must try to reduce the distributed capacitance or leakage inductance, and it is often contradictory to have both reduced at the same time. In addition, to further increase the bandwidth factor and broaden the frequency band, the ratio of magnetizing inductance to leakage inductance must also be increased, however, for a certain core and winding configuration, it is not possible to increase magnetizing inductance and reduce leakage inductance. The absolute bandwidth, and in particular the upper operating frequency, of the centralized parameter transformer is therefore very limited. The transmission line impedance transformer for distributing the parameters generally has two conditions. One is that the characteristic impedance of the transmission line segment has to meet certain requirements, for example equal to the geometric mean of the transformed two-terminal impedance. Another condition is that the length of the transmission line segment is comparable to the operating wavelength, e.g. the line length is equal to a quarter wavelength. It is apparent that when the frequency is low, the size of the transducer is large, and its relative bandwidth is small, both at high and low frequencies. Therefore, the transmission line segment impedance transformer distributing the parameters is practically limited to narrowband applications in the microwave band. Impedance variation in the broad frequency region between low frequency and microwaves is difficult to achieve for concentrated parameter transformers due to the effects of distributed capacitance and leakage inductance. For a distributed parameter transmission line segment transformer, it is also difficult to achieve due to the limitations associated with device size and operating wavelength.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model aims to provide the short-wave 20W power amplifier impedance matching circuit which can effectively realize an impedance matching device with wide applicable frequency range, large relative bandwidth, small size and higher efficiency.
The technical scheme adopted by the utility model is as follows: a shortwave 20W power amplifier impedance matching circuit comprises a double-hole magnetic core, a first coaxial cable and a second coaxial cable; the section of the double-hole magnetic core is 8-shaped; the first coaxial cables are respectively wound on two holes of the double-hole magnetic core and the magnetic core wall which is far away from each other, and the second coaxial cables are wound on the magnetic core wall between the two holes of the double-hole magnetic core.
It should be noted that, the above-mentioned "the first coaxial cables are respectively wound on the two holes of the dual-hole magnetic core" means that the first coaxial cables are respectively wound on the two holes of the "8" -shaped magnetic core and on the magnetic core walls far away from each other; the second coaxial cable is wound between two holes of the double-hole magnetic core, and the second coaxial cable is wound on the magnetic core wall between the two holes of the 8-shaped magnetic core.
Further, the 2873 series magnetic cores are used for the double-hole magnetic core.
Further, the first coaxial cable is a 25 ohm coaxial cable wound on a dual hole core to form a 1 to 9 transmission line transformer.
Further, the second coaxial cable is a 50 ohm coaxial cable wound as a 1 to 1 unbalanced balun on a dual hole core.
The beneficial effects are that:
the utility model provides an impedance matching circuit of a shortwave 20W power amplifier, which adopts the impedance transformation design of a transmission line transformer. The transmission line transformer is formed by winding a transmission line around a magnetic core, and thus can be regarded as a product of a combination of a lumped parameter transformer and a distributed parameter transmission line segment impedance transformer. Therefore, the applicable frequency range is wide, the relative bandwidth is large, the size is small, the power amplifier is realized, and the power amplifier has higher drain electrode efficiency when in use.
Drawings
FIG. 1 is a schematic diagram of an impedance transformer design of an impedance matching circuit for a short-wave 20W power amplifier according to the present utility model;
FIG. 2 is a schematic diagram of a dual-hole magnetic core of an impedance matching circuit of a shortwave 20W power amplifier of the utility model;
FIG. 3 is a front view of a schematic winding of a first coaxial cable and a second coaxial cable on a dual-hole magnetic core in a shortwave 20W power amplifier impedance matching circuit according to the present utility model;
FIG. 4 is a rear view of a schematic winding of a first coaxial cable and a second coaxial cable on a dual-hole magnetic core in a shortwave 20W power amplifier impedance matching circuit according to the present utility model;
fig. 5 is a schematic diagram of winding a first coaxial cable and a second coaxial cable on a dual-hole magnetic core in a shortwave 20W power amplifier impedance matching circuit according to the present utility model;
FIG. 6 is a schematic diagram of the output power and drain efficiency coordinates of a short-wave 20W power amplifier in the application of impedance matching of an actual power amplifier, which is obtained by ADS simulation and physical test;
wherein, 1-double hole magnetic core, 2-first coaxial cable, 3-second coaxial cable;
in fig. 6, DE ordinate represents efficiency of the power amplifier drain, and rf_out (W) abscissa represents output power of the power amplifier tube.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.
The short-wave 20W power amplifier impedance matching circuit shown in the figures 2-5 comprises a double-hole magnetic core, a first coaxial cable and a second coaxial cable; the section of the double-hole magnetic core is 8-shaped; the first coaxial cables are respectively wound on two holes of the double-hole magnetic core and the magnetic core walls which are far away from each other, and the second coaxial cables are wound on the magnetic core between the two holes of the double-hole magnetic core.
In this embodiment, it should be noted that, the above-mentioned "the first coaxial cables are respectively wound on the two holes of the dual-hole magnetic core" means that the first coaxial cables are respectively wound on the left and right holes of the "8" -shaped magnetic core and are separated from each other on the magnetic core wall; the second coaxial cable is wound between two holes of the double-hole magnetic core, and the second coaxial cable is wound on the magnetic core wall between the two holes of the 8-shaped magnetic core.
In this embodiment, the 2873 series of cores are used for the dual-hole core.
In this embodiment, the first coaxial cable is a 25 ohm coaxial cable wound as a 1 to 9 transmission line transformer on a dual hole core.
In this embodiment, the second coaxial cable is a 50 ohm coaxial cable wound as a 1 to 1 unbalanced balun on a dual hole magnetic core.
As shown in fig. 6, the results were substantially identical by ADS simulation results and physical testing. The result shows that when the power amplifier outputs 25W, the drain efficiency is about 64%, so that the characteristics of miniaturization, wide applicable frequency range and large relative bandwidth of the impedance converter are realized, and the aim of higher drain efficiency of the power amplifier is fulfilled.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (4)
1. The utility model provides a shortwave 20W power amplifier impedance matching circuit which characterized in that: the coaxial cable comprises a double-hole magnetic core, a first coaxial cable and a second coaxial cable; the section of the double-hole magnetic core is 8-shaped; the first coaxial cables are respectively wound on two holes of the double-hole magnetic core and the magnetic core walls which are far away from each other, and the second coaxial cables are wound on the magnetic core between the two holes of the double-hole magnetic core.
2. The short-wave 20W power amplifier impedance matching circuit of claim 1, wherein: the double-hole magnetic core adopts 2873 series magnetic cores.
3. The short-wave 20W power amplifier impedance matching circuit of claim 1, wherein: the first coaxial cable adopts a 25 ohm coaxial cable, and is wound on a double-hole magnetic core to form a transmission line transformer with the ratio of 1 to 9.
4. The short-wave 20W power amplifier impedance matching circuit of claim 1, wherein: the second coaxial cable is a 50 ohm coaxial cable wound into a 1 to 1 unbalanced balun on a dual hole magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320017657.3U CN218958890U (en) | 2023-01-04 | 2023-01-04 | Short wave 20W power amplifier impedance matching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320017657.3U CN218958890U (en) | 2023-01-04 | 2023-01-04 | Short wave 20W power amplifier impedance matching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218958890U true CN218958890U (en) | 2023-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320017657.3U Active CN218958890U (en) | 2023-01-04 | 2023-01-04 | Short wave 20W power amplifier impedance matching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218958890U (en) |
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2023
- 2023-01-04 CN CN202320017657.3U patent/CN218958890U/en active Active
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