CN210296591U - High-power short-wave broadband antenna balun - Google Patents
High-power short-wave broadband antenna balun Download PDFInfo
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- CN210296591U CN210296591U CN201920415670.8U CN201920415670U CN210296591U CN 210296591 U CN210296591 U CN 210296591U CN 201920415670 U CN201920415670 U CN 201920415670U CN 210296591 U CN210296591 U CN 210296591U
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- feed tube
- coaxial
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Abstract
The utility model discloses a high-power short-wave broadband antenna balun, which comprises an unbalanced coaxial input feed tube, wherein an inner conductor at the output end of the unbalanced coaxial input feed tube is connected with an inner conductor at the input end of a first coaxial output feed tube, and is simultaneously connected with an outer conductor at the input end of a second coaxial output feed tube; the outer conductor at the output end of the unbalanced coaxial input feed tube is connected with the outer conductor at the input end of the first coaxial output feed tube; the input end of the first coaxial output feed tube is connected with the inner conductor of the input end of the second coaxial output feed tube by a conductor; conductor connecting parts of the output end of the unbalanced coaxial input feed tube, the input end of the first coaxial output feed tube and the input end of the second coaxial output feed tube are arranged in the metal shielding cavity; the intersection of the metal shielding cavity and the feed tube is connected with the outer conductor of the feed tube. The utility model discloses can regard as balanced output short wave antenna's balun, have simple structure, frequency band width, withstand voltage height, bear advantage such as power is big, standing-wave ratio is little.
Description
Technical Field
The utility model relates to an antenna feed field especially relates to a high-power shortwave broadband antenna balun.
Background
At present, a high-power short-wave broadcast transmitting antenna unit generally adopts a horizontally symmetrical cage-shaped antenna or a folded dipole, the impedance is generally hundreds of ohms, the antenna is balanced input, a transmitter connected with the antenna is generally unbalanced feed tube output, the characteristic impedance is generally 50 ohms, and the transmitting power is very high, generally tens of kilowatts and even hundreds of kilowatts. Therefore, in order to radiate the output power of the transmitter safely and efficiently, a very flat balun must be provided in addition to the tuner. Due to the limitations of the device material, the withstand voltage and the withstand power, the balun designed by adopting the lumped parameters is generally limited in withstand power, and when the transmitting power reaches tens of kilowatts or even hundreds of kilowatts, the balun designed by adopting the lumped parameters cannot be adopted, and a transmission transformer wound on the basis of ferrite cannot be adopted.
In view of this, according to practical application needs, a high-power short-wave broadband antenna balun is provided. The utility model discloses balun, not only the frequency band is wide, and the frequency band can reach 25 octaves, and the impedance transformation ratio is 1:4, and can be high pressure resistant, and bear hundreds of kilowatts' radio frequency power.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a high-power shortwave broadband balun is provided for shortwave broadcast transmitting antenna.
In order to solve the problem, the utility model discloses a high-power shortwave broadband antenna balun, include: the device comprises an unbalanced coaxial input feed tube, a first coaxial output feed tube, a second coaxial output feed tube and a metal shielding cavity. Wherein, the inner conductor of the output end of the unbalanced coaxial input feed tube is connected with the inner conductor of the input end of the first coaxial output feed tube by a conductor and is connected with the outer conductor of the input end of the second coaxial output feed tube by a conductor; the outer conductor at the output end of the unbalanced coaxial input feed tube is connected with the outer conductor at the input end of the first coaxial output feed tube by a conductor; the input end of the first coaxial output feed tube is connected with the inner conductor of the input end of the second coaxial output feed tube by a conductor; the connecting parts of the output end of the unbalanced coaxial input feed tube, the input end of the first coaxial output feed tube and the second coaxial output input end are arranged in the metal shielding cavity; the intersection of the metal shielding cavity and the feed tube is connected with the outer conductor of the feed tube.
The equivalent size of the metal cavity meets the formula
tanβL→∞
Wherein L represents the equivalent length of the cavity,
(λ represents wavelength)
According to the above scheme, the utility model discloses can regard as balanced unbalanced balance ware of balanced output short wave antenna, the frequency band can reach 25 octaves, and the impedance transformation is than 1:4, is particularly suitable for giving the feed of broadband high impedance symmetrical antenna, for example symmetrical folded dipole or cage antenna to can bear tens kilovolts's voltage and hundreds of kilowatts radio frequency power.
Drawings
Fig. 1 is the structure schematic diagram of the main view of the high-power short-wave broadband balun transformer of the utility model.
Fig. 2 is another schematic view of the high-power short-wave broadband balun of the present invention.
Detailed Description
In the figure, 1-unbalanced coaxial input feed tube; 2-a first coaxial output feed tube; 3-a second coaxial output feed tube; 4-a metal cavity; 5. 6, 7, 8-metal conductors; 11-an inner conductor at the output end of the unbalanced coaxial input feed tube; 12-an unbalanced coaxial input feed tube output end outer conductor; 21-the inner conductor of the input end of the first coaxial feed tube; 22-the first coaxial feed tube input end outer conductor; 31-inner conductor of input end of second coaxial feed tube; 32-the second coaxial feed tube input end outer conductor; 14-the junction of the unbalanced coaxial input feed tube and the metal cavity; 24-the junction of the first coaxial feed tube and the metal cavity; 34-the junction of the second coaxial feed tube and the metal cavity.
Fig. 2 shows the structure schematic diagram of the high-power short-wave broadband balun of the present invention. The utility model provides a the utility model discloses a high-power shortwave broadband antenna balun, include: an unbalanced coaxial input feed tube 1, a first coaxial output feed tube 2, a second coaxial output feed tube 3 and a metallic shield cavity 4. Wherein, the inner conductor 11 at the output end of the unbalanced coaxial input feed tube 1 is connected with the inner conductor 21 at the input end of the first coaxial output feed tube 2 by the conductor phase 5, and is connected with the outer conductor at the input end of the second coaxial output feed tube 3 by the conductor phase 6 32; the outer conductor 12 at the output end of the unbalanced coaxial input feed tube 1 is connected with the outer conductor 22 at the input end of the first coaxial output feed tube 2 by a conductor 7; the outer conductor 22 at the input end of the first coaxial output feed tube 2 is connected with the inner conductor 31 at the input end of the second coaxial output feed tube 3 by the conductor 8; the mutual connection part of the output end of the unbalanced coaxial input feed tube 1, the input end of the first coaxial output feed tube 2 and the input end of the second coaxial feed tube is arranged in the metal shielding cavity 4; the metal shielding cavity 4 is electrically connected with the connection parts 14, 24 and 34 of the outer conductors of the unbalanced coaxial input feed tube 1, the first coaxial output feed tube 2 and the second coaxial output feed tube 3.
Because the connection mode structure of the output end of the unbalanced coaxial input feed tube, the input end of the first coaxial output feed tube and the second coaxial output input end is symmetrical, the current of the output end of the unbalanced coaxial input feed tube is equally distributed to the first coaxial feed tube and the second coaxial feed tube, the phases are opposite, the equal-amplitude reverse condition required by the balance end is completely met, and the balance and unbalance conversion is realized.
The equivalent size of the metal cavity meets the formula
tanβL→∞
Wherein L represents the length of the cavity,
(λ represents a wavelength).
The following are the main technical parameters of the composite folded dipole antenna of the embodiment:
frequency range: 4.4 MHz-26 MHz
Impedance transformation ratio: 4: 1
Standing-wave ratio: less than 2.5
Maximum bearing power 500kW
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A high-power short-wave broadband antenna balun is characterized in that: the device comprises an unbalanced coaxial input feed tube, a first coaxial output feed tube, a second coaxial output feed tube and a metal shielding cavity; the inner conductor at the output end of the unbalanced coaxial input feed tube is connected with the inner conductor at the input end of the first coaxial output feed tube by a conductor and is connected with the outer conductor at the input end of the second coaxial output feed tube by a conductor; the outer conductor at the output end of the unbalanced coaxial input feed tube is connected with the outer conductor at the input end of the first coaxial output feed tube by a conductor; the input end of the first coaxial output feed tube is connected with the inner conductor of the input end of the second coaxial output feed tube by a conductor.
2. The high-power short-wave broadband antenna balun transformer of claim 1, characterized in that: the connecting parts of the output end of the unbalanced coaxial input feed tube, the input end of the first coaxial output feed tube and the second coaxial output input end are arranged in the metal shielding cavity; the intersection of the metal shielding cavity and the feed tube is connected with the outer conductor of the feed tube.
3. The high-power short-wave broadband antenna balun transformer of claim 1, characterized in that: the equivalent length of the metal shielding cavity satisfies the formula
tanβL→∞
Wherein L represents the equivalent length of the cavity,
(λ represents a wavelength).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415670.8U CN210296591U (en) | 2019-03-29 | 2019-03-29 | High-power short-wave broadband antenna balun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415670.8U CN210296591U (en) | 2019-03-29 | 2019-03-29 | High-power short-wave broadband antenna balun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210296591U true CN210296591U (en) | 2020-04-10 |
Family
ID=70060531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920415670.8U Expired - Fee Related CN210296591U (en) | 2019-03-29 | 2019-03-29 | High-power short-wave broadband antenna balun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210296591U (en) |
-
2019
- 2019-03-29 CN CN201920415670.8U patent/CN210296591U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200410 Termination date: 20210329 |