CN117595817B - Power distribution synthesizer covering VLF-VHF frequency band and power distribution method thereof - Google Patents
Power distribution synthesizer covering VLF-VHF frequency band and power distribution method thereof Download PDFInfo
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- 230000015572 biosynthetic process Effects 0.000 claims abstract description 91
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 91
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
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Abstract
The invention discloses a power distribution synthesizer covering VLF-VHF frequency band and a power distribution method thereof, belonging to the technical field of power distribution synthesizers. The power divider comprises a plurality of radio frequency connectors which are respectively connected with a signal input end and an output end of the power divider; the power distribution unit is connected with the radio frequency connector and is provided with a group of signal input ports and four groups of signal output ports, and the power distribution unit is used for forming four paths of distribution output of signals; and the isolation unit is electrically connected with the power distribution unit and is used for isolating four paths of signal output ports. The power distribution unit uniformly distributes the transmitted power to each group of transmission line transformers to realize the transmission of larger power, and the isolation units are matched to isolate the power division synthesis circuits, so that the isolation degree between four paths of distribution synthesis ports in the working frequency band is high, the mutual influence among transmission paths can be reduced, and the working stability of the whole system is ensured.
Description
Technical Field
The invention belongs to the technical field of power distribution synthesizers, and particularly relates to a power distribution synthesizer covering a VLF-VHF frequency band and a power distribution method thereof.
Background
A power divider is a device that divides the input signal energy into two or more outputs, or vice versa, and combines the multiple signal energies into one output, also referred to herein as a combiner. With the rapid progress of aerospace technology in China, radio and related radio frequency testing technologies are greatly developed, transmitters and receivers of short wave and ultra-short wave frequency bands are developed towards ultra-wideband directions, power of a whole system is continuously improved, the working bandwidth of a power distributor needs to meet the wideband from a few kilohertz to hundreds of megahertz, the power capacity needs to cover the level from a few kilowatts to even up to tens of kilowatts, the bandwidth of the existing power distributor is not as wide, and isolation among branches is not large enough, so that the power distributor cannot meet the use requirements of multiple application scenes.
Disclosure of Invention
The invention aims to: the power distribution synthesizer covering the VLF-VHF frequency band and the power distribution method thereof are provided, and the problems in the prior art are solved.
The technical scheme is as follows: a power distribution synthesizer covering VLF-VHF frequency band comprises a plurality of radio frequency connectors for connecting a signal input end and an output end;
the power distribution unit is connected with the radio frequency connector and is provided with a group of signal input ports and four groups of signal output ports, and the power distribution unit is used for forming four paths of distribution output of signals;
and the isolation unit is electrically connected with the power distribution unit and is used for isolating four paths of signal output ports.
Preferably, the power distribution unit includes nine groups of transmission line transformers, namely a transmission line transformer TF1 to a transmission line transformer TF9, a pin 1 of the transmission line transformer TF1 is used as a signal input end of the power divider, a pin 2 of the transmission line transformer TF1 is connected with a pin 1 of the transmission line transformer TF2 and a pin 1 of the transmission line transformer TF3, a pin 4 of the transmission line transformer TF1 is connected with a pin 3 of the transmission line transformer TF8 and a pin 3 of the transmission line transformer TF9, and a pin 3 of the transmission line transformer TF1 is grounded; the transmission line transformer TF3, the transmission line transformer TF4, the transmission line transformer TF5 and the transmission line transformer TF8 are connected, the transmission line transformer TF2, the transmission line transformer TF6, the transmission line transformer TF7 and the transmission line transformer TF9 are connected, and the connection modes of the transmission line transformer TF3, the transmission line transformer TF4, the transmission line transformer TF5 and the transmission line transformer TF8 are symmetrically distributed with the connection modes of the transmission line transformer TF2, the transmission line transformer TF6, the transmission line transformer TF7 and the transmission line transformer TF 9.
Preferably, the pin 2 of the transmission line transformer TF2 is connected to the pin 1 of the transmission line transformer TF6 and the pin 1 of the transmission line transformer TF7, the pin 3 of the transmission line transformer TF2 is connected to the pin 1 of the transmission line transformer TF8 and the pin 3 of the transmission line transformer TF3, and the pin 4 of the transmission line transformer TF2 is connected to the pin 3 of the transmission line transformer TF 7;
pin 2 of transmission line transformer TF9 is connected to pin 1 of transmission line transformer TF7, and pin 4 of transmission line transformer TF9 is connected to pin 3 of transmission line transformer TF 6;
pin 2 of transmission line transformer TF3 is connected to pin 1 of transmission line transformer TF5, and pin 4 of transmission line transformer TF3 is connected to pin 3 of transmission line transformer TF 4;
pin 2 of transmission line transformer TF8 is connected to pin 1 of transmission line transformer TF4, and pin 4 of transmission line transformer TF8 is connected to pin 3 of transmission line transformer TF 5;
pin 4 of the transmission line transformer TF4 is grounded, and pin 2 of the transmission line transformer TF4 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF5 is grounded, and pin 2 of the transmission line transformer TF5 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF6 is grounded, and pin 2 of the transmission line transformer TF6 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF7 is grounded, and pin 2 of the transmission line transformer TF7 is a signal output port of the power divider.
Preferably, the isolation unit comprises an isolation resistor R1, an isolation resistor R2, an isolation resistor R3, an isolation resistor R4 and an isolation resistor R5, wherein two ends of the isolation resistor R1 are respectively connected with a pin 3 of the transmission line transformer TF2 and a pin 3 of the transmission line transformer TF 3;
two ends of the isolation resistor R2 are respectively connected with a pin 3 of the transmission line transformer TF6 and a pin 3 of the transmission line transformer TF 7;
two ends of the isolation resistor R3 are respectively connected with a pin 3 of the transmission line transformer TF4 and a pin 3 of the transmission line transformer TF 5;
two ends of the isolation resistor R4 are respectively connected with a pin 1 of the transmission line transformer TF4 and a pin 1 of the transmission line transformer TF 5;
two ends of the isolation resistor R5 are respectively connected with the pin 1 of the transmission line transformer TF6 and the pin 1 of the transmission line transformer TF 7.
Preferably, the resistances of the isolation resistor R1, the isolation resistor R2, the isolation resistor R3, the isolation resistor R4 and the isolation resistor R5 are all 50Ω, and the power bearing class of the isolation resistor R1, the isolation resistor R2, the isolation resistor R3, the isolation resistor R4 and the isolation resistor R5 are matched with the transmitted power.
Preferably, the characteristic impedance of the pin 1 of the transmission line transformer TF1, the pin 2 of the transmission line transformer TF4, the pin 2 of the transmission line transformer TF5, the pin 2 of the transmission line transformer TF6, and the pin 2 of the transmission line transformer TF7 is 50Ω.
Preferably, the transmission line transformers TF1 to TF9 are the same type of transmission line transformers, and include a magnetic core and a coaxial cable, where the coaxial cable is wound on the magnetic core to form a transmission line transformer with four terminals, and the coaxial cables are all coaxial cables with characteristic impedance of 50Ω, and the parameters of the magnetic core are matched with the power class of transmission.
Preferably, the radio frequency connector, the power distribution unit and the isolation unit which are electrically connected with each other are arranged on the PCB to manufacture a power distribution/synthesis circuit board, and are placed in the box body.
A method for covering VLF-VHF band power allocation synthesis, comprising the steps of: :
s1, a transmission line transformer TF3, a transmission line transformer TF4, a transmission line transformer TF5 and a transmission line transformer TF8 are connected with each other to form a first path of power division synthesis circuit, a transmission line transformer TF2, a transmission line transformer TF6, a transmission line transformer TF7 and a transmission line transformer TF9 are connected with each other to form a second path of power division synthesis circuit, the first path of power division synthesis circuit and the second path of power division synthesis circuit are relatively independent, and the connection mode of the first path of power division synthesis circuit and the connection mode of the second path of power division synthesis circuit are symmetrically distributed;
s2, an isolation resistor R1 is arranged between input ports of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit, and high isolation is established between the first path of power division and synthesis circuit and the second path of power division and synthesis circuit under the action of the isolation resistor R1;
s3, an isolation resistor R4, an isolation resistor R2 and an isolation resistor R5 are respectively arranged between output ends of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit, and under the action of the isolation resistor R3, the isolation resistor R4, the isolation resistor R2 and the isolation resistor R5, high isolation is established between output ports of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit;
s4, the first power division and synthesis circuit and the second power division and synthesis circuit are connected and combined with the transmission line transformer TF1 to form a four-way power division and synthesis circuit, and four-way power distribution and synthesis are established to cover VLF-VHF frequency bands.
Preferably, the isolation resistor R2, the isolation resistor R3, the isolation resistor R4, the isolation resistor R5 and the isolation resistor R1 in the step S4 are all high-power resistors with heat dissipation flanges.
The beneficial effects are that: the invention relates to a power distribution synthesizer covering VLF-VHF frequency band and a power distribution method thereof, wherein the power distribution unit is provided with a group of signal input ports and four groups of signal output ports, and under the action of the power distribution unit, the power distribution synthesizer with one input and four outputs is formed, and the VLF-VHF frequency band can be covered under the interconnection of a transmission line transformer TF1 and a transmission line transformer TF 9. The connection modes of the transmission line transformers TF3, TF4, TF5 and TF8 and the connection modes of the transmission line transformers TF2, TF6, TF7 and TF9 are symmetrically distributed to form two groups of relatively independent two-way power dividing and synthesizing circuits respectively, so that the transmitted power is uniformly distributed to each group of transmission line transformers, and the transmission of higher power is realized;
and secondly, under the cooperation of the isolation units, all the power division synthesis circuits are isolated, so that the isolation degree between four paths of distribution synthesis ports in the working frequency band is high, the mutual influence between transmission paths can be reduced, the isolation resistors R3 and R4, the isolation resistor R2 and the isolation resistor R5 are respectively arranged between the output ends of the common division synthesis circuits, the higher isolation degree between the output ports of the power division synthesis circuits is ensured, the isolation resistor R1 is arranged between two paths of power division synthesis circuits, the higher isolation degree between the two paths of power division synthesis circuits is ensured, and the working stability of the whole system combined by the two paths of power division synthesis circuits is ensured.
Drawings
FIG. 1 is a circuit diagram of a power distribution synthesis method of the present invention;
FIG. 2 is a schematic circuit diagram of a transmission line transformer according to the present invention;
FIG. 3 is a schematic diagram of the overall structure of the present invention;
FIG. 4 is a graph of transmission loss parameters according to the present invention;
FIG. 5 is a graph of the isolation parameter of the present invention.
Detailed Description
As shown in fig. 1 to 5, the present invention provides a technical solution: the power distribution synthesizer for covering VLF-VHF frequency band comprises a plurality of radio frequency connectors, a power distribution unit and an isolation unit, wherein in the embodiment, four groups of radio frequency connectors are adopted, as shown in figure 3, the power distribution unit is provided with a group of signal input ports and four groups of signal output ports, the power distribution unit is used for forming four paths of distribution output for signals, the signal input ports and the signal output ports of the power distribution unit are respectively connected with the radio frequency connectors, the power distribution unit and the isolation unit which are electrically connected with each other are arranged on a PCB circuit board, a power distribution/synthesis circuit board is manufactured according to a circuit schematic diagram of a power distribution synthesis method and is arranged in a box body, so as to form a four-in four-out power distribution synthesizer, wherein the power distribution unit comprises nine groups of transmission line transformers TF1 to TF9, pins 1 of the transmission line transformer TF1 are used as signal input ends of the power distribution unit, pins 2 of the transmission line transformer TF1 are respectively connected with pins 1 of the transmission line transformer TF2 and TF3, pins 1 of the transmission line transformer TF3 are connected with pins 1 of the transmission line transformer TF3, pins 3 of the transmission line transformer TF1 and pins 3 of the transmission line transformer TF3 are connected with pins 3; the transmission line transformer TF3, the transmission line transformer TF4, the transmission line transformer TF5 and the transmission line transformer TF8 are connected, the transmission line transformer TF2, the transmission line transformer TF6, the transmission line transformer TF7 and the transmission line transformer TF9 are connected, the connection mode of the transmission line transformer TF3, the transmission line transformer TF4, the transmission line transformer TF5 and the transmission line transformer TF8 is symmetrically distributed with the connection mode of the transmission line transformer TF2, the transmission line transformer TF6, the transmission line transformer TF7 and the transmission line transformer TF9, the transmission line transformer TF3, the transmission line transformer TF4, the transmission line transformer TF5 and the transmission line transformer TF8 are mutually connected to form a first path of power division synthesis circuit, the transmission line transformer TF2, the transmission line transformer TF6, the transmission line transformer TF7 and the transmission line transformer TF9 are mutually connected to form a second power division and synthesis circuit, the transmission line transformer TF1 is connected with the first power division and synthesis circuit and the second power division and synthesis circuit to form a four-way power division and synthesis circuit, VLF-VHF frequency bands can be covered, the connection modes of the first power division and synthesis circuit and the second power division and synthesis circuit are symmetrically distributed, two groups of two relatively independent power division and synthesis circuits are respectively formed, so that transmitted power is uniformly distributed to each group of transmission line transformers, and 4000W power signals can be stably transmitted.
The isolation unit is electrically connected with the power distribution unit, and is used for isolating four paths of signal output ports, under the cooperation of the isolation unit, all transmission line transformers are isolated, so that the isolation degree between four paths of distribution synthesis ports in an operating frequency band is high, the mutual influence among all transmission paths can be reduced, as shown in fig. 4 and 5, the transmission loss of the embodiment is less than 0.7dB, the isolation degree is more than 35dB in the operating frequency band within the range of 9 kHz-100 MHz, and the very good performance index is achieved, and the working stability of the whole system is ensured. The isolation unit comprises an isolation resistor R1, an isolation resistor R2, an isolation resistor R3, an isolation resistor R4 and an isolation resistor R5, wherein the isolation resistors R1 to the isolation resistor R5 are all isolation resistors with 50 omega resistance, the power bearing grades of the isolation resistors are matched with the transmitted power, and the isolation resistors are all high-power resistors with heat dissipation flanges due to the fact that the isolation resistors bear high-power transmission.
In a further embodiment, as shown in fig. 1, the characteristic impedances of the pin 1 of the transmission line transformer TF1, the pin 2 of the transmission line transformer TF4, the pin 2 of the transmission line transformer TF5, the pin 2 of the transmission line transformer TF6, and the pin 2 of the transmission line transformer TF7 are 50Ω;
the pin 2 of the transmission line transformer TF2 is respectively connected with the pin 1 of the transmission line transformer TF6 and the pin 1 of the transmission line transformer TF7, the pin 3 of the transmission line transformer TF2 is connected with the pin 1 of the transmission line transformer TF8 and the pin 3 of the transmission line transformer TF3, and the pin 4 of the transmission line transformer TF2 is connected with the pin 3 of the transmission line transformer TF 7;
pin 2 of transmission line transformer TF9 is connected to pin 1 of transmission line transformer TF7, and pin 4 of transmission line transformer TF9 is connected to pin 3 of transmission line transformer TF 6;
pin 2 of transmission line transformer TF3 is connected to pin 1 of transmission line transformer TF5, and pin 4 of transmission line transformer TF3 is connected to pin 3 of transmission line transformer TF 4;
pin 2 of transmission line transformer TF8 is connected to pin 1 of transmission line transformer TF4, and pin 4 of transmission line transformer TF8 is connected to pin 3 of transmission line transformer TF 5;
pin 4 of the transmission line transformer TF4 is grounded, and pin 2 of the transmission line transformer TF4 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF5 is grounded, and pin 2 of the transmission line transformer TF5 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF6 is grounded, and pin 2 of the transmission line transformer TF6 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF7 is grounded, and pin 2 of the transmission line transformer TF7 is a signal output port of the power divider;
the two ends of the isolation resistor R1 are respectively connected with the pin 3 of the transmission line transformer TF2 and the pin 3 of the transmission line transformer TF3, so that the isolation degree between the input ends of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit is increased under the action of the isolation resistor R1, and the signal interference between the first path of power division and synthesis circuit and the second path of power division and synthesis circuit is reduced;
two ends of the isolation resistor R2 are respectively connected with a pin 3 of the transmission line transformer TF6 and a pin 3 of the transmission line transformer TF 7;
two ends of the isolation resistor R3 are respectively connected with a pin 3 of the transmission line transformer TF4 and a pin 3 of the transmission line transformer TF 5;
two ends of the isolation resistor R4 are respectively connected with a pin 1 of the transmission line transformer TF4 and a pin 1 of the transmission line transformer TF 5;
the two ends of the isolation resistor R5 are respectively connected with the pin 1 of the transmission line transformer TF6 and the pin 1 of the transmission line transformer TF7, and under the action of the isolation resistor R2, the isolation resistor R3, the isolation resistor R4 and the isolation resistor R5, high isolation is established between two output ports of the first path of power division synthesis circuit and two output ports of the second path of power division synthesis circuit, so that the mutual interference between transmission paths is reduced, the power loss is reduced, and the working stability of the whole system is enhanced;
the isolation resistor and the transmission line transformer are welded on a welding disc of the PCB in a welding mode, connection between the isolation resistor and the transmission line transformer is achieved, and the transmission line transformer is connected with the radio frequency connector in a welding mode.
In a further embodiment, the transmission line transformers TF1 to TF9 are the same transmission line transformers, as shown in fig. 2, and include a magnetic core and a coaxial cable, where the coaxial cable is wound on the magnetic core to form a transmission line transformer with four terminals, and the coaxial cable has a characteristic impedance of 50Ω, so that in order to withstand 4000 high power, in this embodiment, the coaxial cable is a coaxial cable with an outer diameter of up to 6.5mm, the magnetic core is a large magnetic core with an outer diameter of up to 82mm, and the magnetic permeability of the magnetic core is all greater than 100000H/m.
A method for covering VLF-VHF frequency band power distribution synthesis comprises the following steps:
step 1, a transmission line transformer TF3, a transmission line transformer TF4, a transmission line transformer TF5 and a transmission line transformer TF8 are connected with each other to form a first path of power division synthesis circuit, a transmission line transformer TF2, a transmission line transformer TF6, a transmission line transformer TF7 and a transmission line transformer TF9 are connected with each other to form a second path of power division synthesis circuit, the first path of power division synthesis circuit and the second path of power division synthesis circuit are relatively independent, and the connection mode of the first path of power division synthesis circuit and the connection mode of the second path of power division synthesis circuit are symmetrically distributed;
step 2, an isolation resistor R1 is arranged between input ports of the first power division and synthesis circuit and the second power division and synthesis circuit, so that high isolation is established between the first power division and synthesis circuit and the second power division and synthesis circuit, the isolation resistor R1 is a high-power resistor with a heat dissipation flange, and because the isolation resistor R1 is used for isolating between the first power division and synthesis circuit and the second power division and synthesis circuit, the isolation resistor R1 bears larger power, so that the isolation between the first power division and synthesis circuit and the second power division and synthesis circuit is increased, and the signal interference between the first power division and synthesis circuit and the second power division and synthesis circuit is reduced;
step 3, because the output ports of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit are used for connecting the output ends of the power amplification module, in order to protect the power amplification module and obtain larger synthesized power output, the isolation resistor R3, the isolation resistor R4, the isolation resistor R2 and the isolation resistor R5 are respectively arranged between the output ends of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit, so that high isolation is established between the output ports of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit, mutual interference between transmission paths is reduced, power loss is reduced, and meanwhile, the working stability of the whole system is enhanced;
and 4, connecting and combining the first power division and synthesis circuit and the second power division and synthesis circuit with a transmission line transformer TF1 to form a four-way power division and synthesis circuit, and establishing four-way power distribution and synthesis to cover VLF-VHF frequency bands.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (8)
1. A covered VLF-VHF band power divider/combiner comprising:
the radio frequency connectors are used for connecting the signal input end and the signal output end;
the power distribution unit is connected with the radio frequency connector and is provided with a group of signal input ports and four groups of signal output ports, and the power distribution unit is used for forming four paths of distribution output of signals;
the isolation unit is electrically connected with the power distribution unit and is used for isolating four paths of signal output ports;
the power distribution unit comprises nine groups of transmission line transformers, namely a transmission line transformer TF1 and a transmission line transformer TF9, wherein a pin 1 of the transmission line transformer TF1 is used as a signal input end of the power divider, a pin 2 of the transmission line transformer TF1 is respectively connected with the transmission line transformer TF2 and a pin 1 of the transmission line transformer TF3, a pin 4 of the transmission line transformer TF1 is connected with a pin 3 of the transmission line transformer TF8 and a pin 3 of the transmission line transformer TF9, and a pin 3 of the transmission line transformer TF1 is grounded; the transmission line transformers TF3, TF4, TF5 and TF8 are connected, the transmission line transformers TF2, TF6, TF7 and TF9 are connected, and the connection modes of the transmission line transformers TF3, TF4, TF5 and TF8 are symmetrically distributed with the connection modes of the transmission line transformers TF2, TF6, TF7 and TF 9;
the pin 2 of the transmission line transformer TF2 is respectively connected with the pin 1 of the transmission line transformer TF6 and the pin 1 of the transmission line transformer TF7, the pin 3 of the transmission line transformer TF2 is connected with the pin 1 of the transmission line transformer TF8 and the pin 3 of the transmission line transformer TF3, and the pin 4 of the transmission line transformer TF2 is connected with the pin 3 of the transmission line transformer TF 7;
pin 2 of transmission line transformer TF9 is connected to pin 1 of transmission line transformer TF7, and pin 4 of transmission line transformer TF9 is connected to pin 3 of transmission line transformer TF 6;
pin 2 of transmission line transformer TF3 is connected to pin 1 of transmission line transformer TF5, and pin 4 of transmission line transformer TF3 is connected to pin 3 of transmission line transformer TF 4;
pin 2 of transmission line transformer TF8 is connected to pin 1 of transmission line transformer TF4, and pin 4 of transmission line transformer TF8 is connected to pin 3 of transmission line transformer TF 5;
pin 4 of the transmission line transformer TF4 is grounded, and pin 2 of the transmission line transformer TF4 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF5 is grounded, and pin 2 of the transmission line transformer TF5 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF6 is grounded, and pin 2 of the transmission line transformer TF6 is a signal output port of the power divider;
pin 4 of the transmission line transformer TF7 is grounded, and pin 2 of the transmission line transformer TF7 is a signal output port of the power divider.
2. The power divider/combiner for covering VLF-VHF frequency band according to claim 1, wherein the isolation unit comprises an isolation resistor R1, an isolation resistor R2, an isolation resistor R3, an isolation resistor R4, and an isolation resistor R5, and two ends of the isolation resistor R1 are respectively connected to a pin 3 of a transmission line transformer TF2 and a pin 3 of the transmission line transformer TF 3;
two ends of the isolation resistor R2 are respectively connected with a pin 3 of the transmission line transformer TF6 and a pin 3 of the transmission line transformer TF 7;
two ends of the isolation resistor R3 are respectively connected with a pin 3 of the transmission line transformer TF4 and a pin 3 of the transmission line transformer TF 5;
two ends of the isolation resistor R4 are respectively connected with a pin 1 of the transmission line transformer TF4 and a pin 1 of the transmission line transformer TF 5;
two ends of the isolation resistor R5 are respectively connected with the pin 1 of the transmission line transformer TF6 and the pin 1 of the transmission line transformer TF 7.
3. The power divider/combiner for covering VLF-VHF band according to claim 2, wherein the isolation resistors R1, R2, R3, R4, R5 each adopt a resistor with a resistance value of 50Ω, and the power bearing level thereof is matched with the power to be transmitted.
4. The overlay VLF-VHF band power distribution combiner of claim 1 wherein the characteristic impedance of pin 1 of transmission line transformer TF1, pin 2 of transmission line transformer TF4, pin 2 of transmission line transformer TF5, pin 2 of transmission line transformer TF6, and pin 2 of transmission line transformer TF7 are all 50Ω.
5. The overlay VLF-VHF band power distribution combiner of claim 1 wherein the transmission line transformers TF 1-TF 9 are the same type of transmission line transformer comprising a core and a coaxial cable wound around the core to form a four terminal transmission line transformer, wherein the coaxial cables each comprise a coaxial cable having a characteristic impedance of 50 Ω, the core parameters being matched to the power class of the transmission.
6. The power distribution combiner for covering VLF-VHF band according to claim 1, wherein the rf connector, the power distribution unit, and the isolation unit, which are electrically connected to each other, are mounted on a PCB to make a power distribution/combining circuit board and are placed in a case.
7. A method of covering VLF-VHF band power allocation synthesis, implemented by a covering VLF-VHF band power allocation synthesizer according to any one of claims 1-6, comprising the steps of:
s1, a transmission line transformer TF3, a transmission line transformer TF4, a transmission line transformer TF5 and a transmission line transformer TF8 are connected with each other to form a first path of power division synthesis circuit, a transmission line transformer TF2, a transmission line transformer TF6, a transmission line transformer TF7 and a transmission line transformer TF9 are connected with each other to form a second path of power division synthesis circuit, the first path of power division synthesis circuit and the second path of power division synthesis circuit are relatively independent, and the connection mode of the first path of power division synthesis circuit and the connection mode of the second path of power division synthesis circuit are symmetrically distributed;
s2, an isolation resistor R1 is arranged between input ports of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit, and high isolation is established between the first path of power division and synthesis circuit and the second path of power division and synthesis circuit under the action of the isolation resistor R1;
s3, an isolation resistor R4, an isolation resistor R2 and an isolation resistor R5 are respectively arranged between output ends of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit, and under the action of the isolation resistor R3, the isolation resistor R4, the isolation resistor R2 and the isolation resistor R5, high isolation is established between output ports of the first path of power division and synthesis circuit and the second path of power division and synthesis circuit;
s4, the first power division and synthesis circuit and the second power division and synthesis circuit are connected and combined with the transmission line transformer TF1 to form a four-way power division and synthesis circuit, so that four-way power distribution and synthesis are formed, and VLF-VHF frequency bands are covered.
8. The method of claim 7, wherein the isolation resistors R2, R3, R4, R5 and R1 in step S2 are all high power resistors with heat dissipation flanges.
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