CN111276809A - A kind of short-wave high-gain variable oscillator multi-element Yagi antenna and its adjustment method - Google Patents

Abstract

The invention provides a short-wave high-gain variable oscillator multi-element Yagi antenna and an adjustment method thereof. The invention includes a truss, a rotating mechanism, a plurality of fixed vibrators, a plurality of variable vibrators and a vibrator adjusting device; all the vibrators are fixed on the truss at a set interval, and the rotating mechanism is used to drive the truss to rotate, so as to realize the adjustment of different vibrators. Azimuth short-wave communication; the vibrator adjusting device is configured with the variable vibrator in one-to-one correspondence, and is used to adjust the length of the corresponding variable vibrator to realize the tuning of the working frequency. The present invention achieves a high gain of 10dBi-15dBi in the short-wave 7-30MHz full frequency band by rationally arranging the number, position and length of the guide oscillator and the reflection oscillator, and at the same time by introducing the adjustment of the length of the reflection oscillator, the active oscillator and some of the leading oscillators. Characteristics of the radiation pattern.

Description

A kind of short-wave high-gain variable oscillator multi-element Yagi antenna and its adjustment method

technical field

The invention belongs to the technical field of antenna communication, and in particular relates to a short-wave high-gain variable-element multi-element Yagi antenna.

Background technique

Short-wave communication still plays an irreplaceable and important role in modern military communication, and short-wave antenna, as an important part of short-wave communication equipment, also has the same importance. For a long time, people have been focusing on the pursuit of short-wave communication broadband, high gain, miniaturization and other goals, but due to the generally large size of antennas in this frequency band, it is difficult to achieve the above goals. related technical reports.

Patent document CN109861006 A discloses a multi-drive unit generalized Yagi antenna and its optimization method. The number of Yagi antenna drive units, reflectors and directors described in the patent document is not limited, and should be adjusted and determined according to on-site needs. The lengths of the driving unit, the reflector and the director unit in this patent document are all fixed, so the operating frequency is also fixed.

Patent document CN106450774 A discloses an ultra-wideband high-gain Yagi antenna. The excitation unit of the Yagi antenna adopts the form of a broadband folded oscillator with double feed points, and realizes high gain and 1.7-2.24GHz broadband characteristics. However, the excitation unit, the guide unit and the length of the reflector are all fixed.

Patent document CN205944387 U discloses a debuggable Yagi antenna, the Yagi antenna includes an active vibrator, a passive reflector and several passive directors, and is slidably connected to two supporting screw rods using a connecting slider , to achieve rapid adjustment of the spacing between units, but the length of each unit vibrator is also fixed.

It can be seen that the length of each element of the existing Yagi antennas is fixed, so when the frequency changes in the short-wave 7-30MHz frequency band, the communication requirement of high gain in the whole frequency band cannot be achieved.

On the other hand, traditionally, a 2×2 logarithmic periodic array is required to achieve the above-mentioned high gain index, which occupies a large area and has high installation and erection complexity.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and proposes a short-wave high-gain variable oscillator multi-element Yagi antenna, which can realize the characteristics of a 10dBi-15dBi high-gain radiation pattern in the short-wave 7-30MHz full frequency band.

To achieve the above object, the technical scheme adopted in the present invention is:

A short-wave high-gain variable vibrator multi-element Yagi antenna, which is special in that it includes a truss, a rotating mechanism, a plurality of fixed vibrators, a plurality of variable vibrators and a vibrator adjustment device; the plurality of variable vibrators are based on functional properties Divided into a reflection oscillator, an active oscillator and several variable orientation oscillators; the longest one of the fixed oscillators is located between the reflection oscillator and the active oscillator, and the rest of the fixed oscillators are used as fixed orientations The vibrator; all the vibrators are fixed on the truss at a set interval, and the rotating mechanism is used to drive the truss to rotate, so as to realize short-wave communication in different directions; the vibrator adjustment device is configured in a one-to-one correspondence with the variable vibrator for adjusting The length of the corresponding variable vibrator to achieve the tuning of the working frequency.

Further, the metal belt used by the variable vibrator is uniformly provided with a plurality of positioning holes along its length direction, and the vibrator adjustment device includes a motor and its servo mechanism, and the servo mechanism adopts a transmission gear plate and the positioning hole. The hole cooperates with the form of snap connection and rolling to realize the adjustment of the effective length of the variable vibrator.

Further, the vibrator adjustment device includes a motor, a reducer, a transmission tooth assembly, a vibrator recovery disc and a vibrator guide, and the variable vibrator is sequentially divided into a first straight section, a first transmission tooth matching section, a recovery section, a first Two transmission tooth matching sections and a second straight line section, the first straight line section and the second straight section are respectively transformed into a first transmission tooth matching section and a second driving tooth matching section according to the deflection of the vibrator guide, and the first transmission tooth matching The matching section of the second transmission tooth is at different heights but in the same vertical plane; the input shaft of the reducer is connected to the output shaft of the motor, and the output shaft of the reducer is provided with the transmission tooth assembly, the transmission tooth The assembly includes two coaxial transmission toothed discs, and the two transmission toothed discs are connected by an insulating column; the two transmission toothed discs are respectively fitted with the positioning holes on the first transmission tooth matching section and the second transmission tooth matching section. connected; the recovery section is wound on the vibrator recovery disk.

Further, the short-wave high-gain variable oscillator multi-element Yagi antenna also includes a plurality of variable oscillator shape support rods, each variable oscillator is built in the corresponding variable oscillator shape support rod, and the variable oscillator can be in the variable oscillator shape. Free expansion and contraction in the support rod.

Further, all the vibrators (fixed vibrator, variable vibrator) are parallel to each other and are arranged perpendicular to the truss.

Further, the rotating mechanism includes a driving motor, a rotary disc and a fixed bracket, the driving motor and the rotary disc are both installed on the fixed bracket, the truss is installed on the rotary disc, and the driving motor is used to drive the rotary disc and then drive the truss to rotate. Here, the drive motor may also consist of a motor and a reducer.

Further, the number of the variable vibrators is 7 in total, the longest one is a reflection vibrator, the second longest is an active vibrator, and the remaining five are variable directional vibrators; the number of the fixed vibrators is 7 in total. , which is composed of four metal rods of different lengths, of which the longest fixed oscillator is located between the reflection oscillator and the active oscillator, and the rest of the fixed oscillators are used as fixed guide oscillators.

Further, the active vibrator is an elongated ring-shaped vibrator with an opening in the middle, and the requirement of the resonant working frequency of 4-7MHz can be achieved by adjusting the length of the bending vibrator.

The present invention also provides a short-wave medium-gain bidirectional radiating variable vibrator antenna, which is special in that it includes a truss, a rotating mechanism, a plurality of variable vibrators and a vibrator adjusting device; the plurality of variable vibrators are set at intervals The distance is fixed on the truss, and the rotating mechanism is used to drive the truss to rotate, so as to realize short-wave communication in different directions; the oscillator adjusting device is arranged in a one-to-one correspondence with the variable oscillator, and is used to adjust the length of the corresponding variable oscillator to To achieve working frequency tuning.

For the short-wave medium-gain bidirectional radiation variable dipole antenna, optimization can be carried out with reference to the above-mentioned further optimization scheme of the short-wave high-gain variable dipole multi-element Yagi antenna.

The above-mentioned adjustment method of a short-wave high-gain variable vibrator multi-element Yagi antenna is special in that it includes:

1) Adjustment of the length of the active oscillator

Through the impedance test module, the standing wave ratio of the antenna is measured;

Continuously adjust the length of the active vibrator until the current standing wave ratio is ≤ 2:1, at which time the length of the active vibrator is the optimal length;

2) Adjustment of passive vibrator length

According to the theoretical calculation, adjust the length of the passive oscillator to the theoretical value;

The gain of the antenna is measured by the UAV antenna test system;

Constantly adjust the length of each passive vibrator to find the maximum gain, at this time the length of the passive vibrator is the optimal length.

Compared with the prior art, the present invention has the following advantages:

(1) The length of the variable vibrator of the present invention can be adjusted and the overall direction of the antenna can be adjusted. The number, position and length of the guiding vibrator and the reflecting vibrator are rationally arranged, and at the same time, the reflective vibrator, the active vibrator and some of the guiding vibrators are introduced. The adjustment of the length can realize the characteristics of high-gain radiation pattern of 10dBi-15dBi in the short-wave 7-30MHz full frequency band.

(2) When the present invention achieves the same gain pattern characteristics, the floor area is only half of that of the log-periodic array antenna, the erection height is reduced by half, and the installation is relatively convenient.

(3) The present invention has a rotatable mechanism, so the radiation direction of the antenna can be adjusted arbitrarily, which cannot be achieved by the traditional logarithmic periodic array with the same gain.

(4) Since the present invention occupies a small area and does not need to be arrayed, the number of antenna elements is small, so the cost of the antenna is greatly reduced.

Description of drawings

1 is a schematic diagram of the overall structure of a short-wave high-gain variable vibrator multi-element Yagi antenna according to an embodiment;

FIG. 2 is a schematic structural diagram of the active oscillator feeding component in FIG. 1;

FIG. 3 is a schematic diagram of the transmission of the variable vibrator in FIG. 1 .

FIG. 4 is a schematic diagram of the extension of the vibrator of the variable vibrator transmission mechanism in FIG. 1 .

FIG. 5 is a schematic diagram of the vibrator folding of the variable vibrator transmission mechanism of FIG. 1 .

FIG. 6 is an arrangement diagram of the vibrator of FIG. 1 .

FIG. 7 is a schematic diagram of the shape support structure of the variable vibrator in FIG. 5 .

FIG. 8 is a schematic diagram of the truss unit in FIG. 5 .

FIG. 9 is a schematic diagram of the fixed vibrator in FIG. 5 .

FIG. 10 is a schematic diagram of the rotating structure in FIG. 1 .

Figure 11 is a schematic diagram of an extended 4-30MHz short-wave high-gain variable-element multi-element Yagi antenna.

FIG. 12 is a schematic diagram of a simplified short-wave medium-gain bidirectional radiation variable dipole antenna.

Description of reference numbers:

1—truss; 2—rotating mechanism; 3—fixed vibrator; 4—variable vibrator; 5 — variable vibrator shape support rod; 6 — vibrator adjustment device; 7 — control unit;

2-1 - top rotating plate; 2-2 - motor + accelerator; 2-3 main body of the turntable; 2-4 - slewing bearing; 2-5 - direction-finding encoder;

3-1——The longest fixed vibrator, 3-2, 3-3, 3-4, 3-5, 3-6, 3-7 are fixed vibrators leading to the vibrator;

3-1-1——Fix the small tube of the vibrator; 3-1-2--Fix the large tube of the vibrator; 3-1-3——Clamp the vibrator base; 3-1-4——Fix the vibrator base;

4-1——variable vibrator as reflection vibrator; 4-2——variable vibrator as active vibrator; 4-3, 4-4, 4-5, 4-6, 4-7——as lead To the variable oscillator of the oscillator;

5-1 - sealing cap; 5-2, 5-4, 5-6, 5-8, 5-10 - vibrator tube; 5-3, 5-5, 5-7, 5-9 - vibrator splicing head;

6-1——Variable oscillator radiator (the first straight line segment); 6-2——Vibrator driver; 6-3——Control plug; 6-4——Vibrator recovery disk; 6-5——Wound disk ; 6-6 - vibrator feeding device; 6-7 - vibrator transmission device (transmission gear plate); 6-8 - vibrator guide; 6-9 - drive motor; 6-10 - drive shaft connection Insulation post.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Embodiment 1, 7-30MHz short-wave high-gain variable vibrator multi-element Yagi antenna:

1, the short-wave high-gain variable vibrator multi-element Yagi antenna of the present invention comprises a truss 1, a rotating mechanism 2, 7 fixed vibrators 3, 7 variable vibrators 4, a variable vibrator shape support rod 5, a vibrator adjustment device 6 and control unit.

The rotating mechanism ² can rotate 3600 degrees to realize short-wave communication in different directions. There are 14 fixed vibrators 3 and variable vibrators 4 in total, which together form a multi-element Yagi antenna, of which there are 7 fixed vibrators 3 and 4 variable vibrators, and all vibrators are fixed on the truss 1 at a certain distance. The variable vibrator 4 is built in the variable vibrator shape support rod 5, and the control unit 7 changes the length of the vibrator through the vibrator adjusting device 6 to achieve the purpose of tuning the working frequency; under different working frequency states, with the variable vibrator The change of the length of 4 and the increase or decrease of the effect of the fixed vibrator 3, the number of vibrators of the Yagi antenna that actually works is also changing, and the pattern characteristics of high gain at different frequency points are realized.

The truss 1 is formed by splicing three truss units according to the required length. Each truss unit is assembled by three metal angle aluminum into a triangular prism structure, which is stable and reliable, and the length of each truss unit is 4.5 meters.

The rotating mechanism 2 includes four parts: a motor, a reducer, a rotary disc, and a fixed bracket, and the motor, the reducer, and the rotary disc are all installed on the fixed bracket, and the fixed bracket is installed on the truss 1 .

The vibrator adjustment device 6 includes 7 small motors and their servo mechanisms 6-1, 6-2, 6-3, 6-4, 6-5, 6-6, 6-7, which are respectively installed in the middle of the variable vibrator 4 .

There are 7 variable oscillators 4 in total, including 5 long ones and 2 short ones; the longest one is the reflection oscillator 4-1, the longest length is 2100cm; the second longest is the active oscillator 4-2, the longest The long length is 2050cm; the other three longer ones are directed to the vibrator 4-3, 4-4, 4-5, and the longest length is 2000cm respectively; the two short ones are also directed to the vibrator 4-6, 4-7 , the longest length is 1000cm.

There are 7 fixed vibrators 3 in total, which are made of carbon fiber tubes and are divided into four different lengths. Among them, the longest fixed vibrator 3-1 is 1500cm long and is located in the reflection vibrator 4-1 and the active vibrator 4-2. The distance between the active oscillators is 4-1, 300cm, and the rest of the fixed oscillators 3-2, 3-3, 3-4, 3-5, 3-6, 3-7 are used as guide oscillators, with a length of 673cm respectively. , 637cm, 612cm, 612cm, 624cm, 637cm, the distance between the variable oscillator 4-1 and the fixed oscillator 3-1 is 5 meters, the distance between the fixed oscillator 3-1 and the fixed oscillator 3-2 is 2.5 meters, the fixed oscillator 3-2 and the adjustable oscillator The distance between the variable oscillator 4-2 is 2.5 meters, the distance between the variable oscillator 4-2 and the fixed oscillator 3-3 is 2.5 meters, the distance between the fixed oscillator 3-3 and the variable oscillator 4-3 is 2.5 meters, and the variable oscillator 4-3 and the fixed oscillator The distance between 3-4 is 2.5 meters, the distance between fixed oscillator 3-4 and variable oscillator 4-4 is 2.5 meters, the distance between variable oscillator 4-4 and fixed oscillator 3-5 is 2.5 meters, and the distance between fixed oscillator 3-5 and variable oscillator 4- 5 The distance is 2.5 meters, the distance between the variable oscillator 4-5 and the fixed oscillator 3-6 is 2.5 meters, the distance between the fixed oscillator 3-6 and the variable oscillator 4-6 is 2.5 meters, the distance between the variable oscillator 4-6 and the fixed oscillator 3-7 3 meters, the distance between the fixed vibrator 3-7 and the variable vibrator 4-7 is 4.5 meters.

Both the fixed vibrator 3 and the variable vibrator 4 are fixed on the truss 1 , see FIG. 6 .

The length of the active vibrator 4-2 can be changed by the vibrator adjusting device 6-2 to realize the tuning of different working frequencies.

The lengths of the variable vibrators 4-1, 4-3, 4-4, 4-5, 4-6, 4-7 can be adjusted by the vibrator adjustment devices 6-1, 6-3, 6-4, 6-5, 6-6, 6-7 are changed to achieve high gain radiation pattern.

The variable vibrator shape support rod 5 is made of non-metallic pipes (glass steel pipes) with different diameters, and is fixed on the truss 1 .

The variable vibrator 4 is made of metal strips (metal strips) punched uniformly. When the vibrator adjusting device 6 adjusts the length of the antenna, the gear will be stuck in the hole of the steel belt to realize the transmission. The specific structure may be: the vibrator adjustment device includes a motor, a reducer, a transmission tooth assembly, a vibrator recovery plate and a vibrator guide, and the variable vibrator can be regarded as being divided into a first straight line section, a first transmission tooth matching section, a recovery section, The second transmission tooth matching segment and the second linear segment, wherein the first linear segment and the second linear segment are respectively transformed into the first transmission tooth matching segment and the second transmission tooth matching segment according to the deflection of the vibrator guide member, and the first transmission tooth matching The mating section and the second transmission tooth are located at different heights but in the same vertical plane; the input shaft of the reducer is connected to the output shaft of the motor, and the output of the reducer drives the transmission tooth assembly, which includes two coaxial transmission teeth The two transmission toothed discs are connected by an insulating column; the two transmission toothed discs are respectively fitted and clamped with the positioning holes on the first transmission tooth matching section and the second transmission tooth matching section; the recovery section is wound around the vibrator recovery plate .

The control unit 7 is composed of a hardware circuit and control software, and realizes the length adjustment of the variable antenna element 4 .

The adjustment method of the length of the active vibrator 4-2 is to measure the standing wave ratio of the antenna through the impedance test module in the hardware circuit. When the standing wave ratio is less than or equal to 2:1, the length of the active vibrator 4-2 is the maximum. optimal length.

Among them, the adjustment method of the length of the passive vibrator 4-1, 4-3, 4-4, 4-5, 4-6, 4-7 is to adjust the length of the passive vibrator to the theoretical value through the control software, that is, the reflection The vibrator 4-1 is about 0.5 wavelength, and the wavelength leading to the vibrator 4-3 to 4-7 is 0.43 wavelength. Then the UAV antenna test system is used to measure the gain of the antenna. By continuously adjusting each passive vibrator 4-1, 4-3, 4-4, 4-5, 4-6, 4-7 length, find the maximum gain, at this time passive oscillators 4-1, 4-3, 4-4, 4-5, The length of 4-6 and 4-7 is the optimal length.

The feeding of the active vibrator 4-2 is in the form of a 1:1 transmission transformer balanced feeding.

When the Yagi antenna works in the 7-13MHz frequency band, it consists of 4-1, 4-2, 4-4, 4-6, 4-7 oscillators to form a 5-element Yagi antenna, and the gain can reach 10dBi.

When the Yagi antenna works in the 13-18MHz frequency band, it consists of 4-1, 4-2, 4-3, 4-4, 4-5, 4-6 vibrators to form a 6-element Yagi antenna, and the gain can reach 12dBi.

When the Yagi antenna works in the 18-30MHz frequency band, the other oscillators except 4-1 and 4-7 form a 12-element Yagi antenna, and the gain can reach more than 14dBi.

In this embodiment, by rationally arranging the number, position and length of the guiding oscillators and reflecting oscillators, and at the same time adjusting the lengths of the reflecting oscillators, active oscillators and some of the leading oscillators, a high frequency of 10dBi-15dBi is achieved in the short-wave 7-30MHz full frequency band. Characteristics of the gain radiation pattern.

Embodiment 2, extended 4-30MHz short-wave high-gain variable oscillator multi-element Yagi antenna:

Referring to FIG. 11 , this embodiment is basically the same as Embodiment 1. In order to extend the frequency point to work at 4 MHz, the difference lies in that the length and form of the active oscillator 4-2 are different. Due to the lower operating frequency, the length of the low-frequency vibrator needs to be longer. In order to reduce the lateral size of the antenna, the active vibrator 4-2 is changed to an elongated ring vibrator with an opening in the middle, and the length of the bending vibrator is adjusted to reach 4- 7MHz resonant operating frequency requirements.

Embodiment 3, a simplified short-wave medium-gain bidirectional radiation variable dipole antenna:

Referring to FIG. 12 , the simplified short-wave medium-gain bidirectional radiation variable vibrator antenna of the present invention includes a truss 1, a rotating mechanism 2, variable vibrators 4-1, 4-2, 4-3, a variable vibrator shape support rod 5, a vibrator Adjustment device 6 and control unit 7 . The variable oscillators 4-1 and 4-3 are passive oscillators, and the variable oscillator 4-2 is an active oscillator.

In order to reduce the lateral size of the antenna, the active vibrator 4-2 is changed to an elongated ring vibrator with an opening in the middle, and the length of the bending vibrator can be adjusted to meet the requirements of the resonant working frequency. When the length of the variable vibrator 4-1 is greater than the length of the active vibrator 4-2, the antenna radiates forward; on the contrary, when the length of the variable vibrator 4-3 is smaller than the length of the active vibrator 4-2, the antenna is backward radiation.

The above description is only a specific example of the present invention. Obviously, for those skilled in the art, after understanding the content and principle of the present invention, it is possible to carry out the form and details without departing from the principle and structure of the present invention. Various corrections and changes, but these corrections and changes based on the idea of the present invention are still within the scope of protection of the claims of the present invention.

Claims (10)

1. The utility model provides a variable oscillator of shortwave high gain multiple yagi antenna which characterized in that: the device comprises a truss (1), a rotating mechanism (2), a plurality of fixed vibrators (3), a plurality of variable vibrators (4) and a vibrator adjusting device (6) thereof; the variable vibrators (4) are divided into a reflection vibrator, an active vibrator and a plurality of variable guiding vibrators according to functional attributes; the longest fixed vibrator (3) is positioned between the reflection vibrator and the active vibrator, and the rest fixed vibrators are used as fixed leading vibrators; all vibrators are fixed on the truss (1) at intervals of a set distance, and the rotating mechanism (2) is used for driving the truss (1) to rotate so as to realize short-wave communication in different directions; the vibrator adjusting devices (6) are configured in one-to-one correspondence with the variable vibrators (4) and are used for adjusting the lengths of the corresponding variable vibrators so as to realize working frequency tuning.

2. The short-wave high-gain variable element multi-yagi antenna according to claim 1, wherein: the adjustable vibrator is characterized in that a plurality of positioning holes are uniformly formed in a metal strip line adopted by the variable vibrator (4) along the length direction of the metal strip line, the vibrator adjusting device (6) comprises a motor and a servo mechanism of the motor, and the servo mechanism adopts a transmission fluted disc and a positioning hole matched and clamped rolling mode to adjust the effective length of the variable vibrator (4).

3. The short-wave high-gain variable element multi-yagi antenna according to claim 2, wherein: the vibrator adjusting device (6) comprises a motor, a speed reducer, a transmission gear assembly, a vibrator recovery disc and a vibrator guide piece, the variable vibrator (4) is sequentially divided into a first straight line section, a first transmission gear matching section, a recovery section, a second transmission gear matching section and a second straight line section, the first straight line section and the second straight line section are respectively converted into the first transmission gear matching section and the second transmission gear matching section according to the deflection of the vibrator guide piece, and the first transmission gear matching section and the second transmission gear matching section are located at different height positions but located in the same vertical plane; the input shaft of the speed reducer is connected with the output shaft of the motor, the output shaft of the speed reducer is provided with the transmission gear assembly, the transmission gear assembly comprises two coaxial transmission gear discs, and the two transmission gear discs are connected through an insulating column; the two transmission gear discs are respectively in adaptive clamping connection with the positioning holes in the first transmission gear matching section and the second transmission gear matching section; the recovery section is wound on the vibrator recovery disc.

4. The short-wave high-gain variable element multi-yagi antenna according to claim 1, wherein: the vibrator shape adjusting device further comprises a plurality of variable vibrator shape supporting rods (5), each variable vibrator (4) is arranged in the corresponding variable vibrator shape supporting rod (5), and the variable vibrators (4) can freely stretch out and draw back in the variable vibrator shape supporting rods (5).

5. The short-wave high-gain variable element multi-yagi antenna according to claim 4, wherein: all vibrators are parallel to each other and are perpendicular to the truss (1).

6. The short-wave high-gain variable element multi-yagi antenna according to claim 1, wherein: the rotating mechanism (2) comprises a driving motor, a rotary disc and a fixed support, the driving motor and the rotary disc are both arranged on the fixed support, the truss (1) is arranged on the rotary disc, and the driving motor is used for driving the rotary disc to further drive the truss (1) to rotate.

7. The short-wave high-gain variable element multi-yagi antenna according to claim 1, wherein: the number of the variable vibrators (4) is 7, the longest one of the variable vibrators is used as a reflection vibrator, the second longest one is used as an active vibrator, and the rest five vibrators are all variable guide vibrators; the number of the fixed vibrators (3) is 7 in total, the fixed vibrators are composed of four metal rods with different lengths, the longest fixed vibrator (3-1) is located between the reflection vibrator and the active vibrator, and the rest fixed vibrators are used as fixed leading vibrators.

8. The short-wave high-gain variable element multi-yagi antenna according to claim 1, wherein: the active vibrator is a flat long ring vibrator with an opening in the middle, and the requirement of 4-7MHz resonance working frequency is met by adjusting the length of the bending vibrator.

9. The utility model provides a two-way variable oscillator antenna of radiation of gain in shortwave which characterized in that: comprises a truss (1), a rotating mechanism (2), a plurality of variable vibrators (4) and a vibrator adjusting device (6) thereof; the variable vibrators (4) are fixed on the truss (1) at intervals of a set distance, and the rotating mechanism (2) is used for driving the truss (1) to rotate so as to realize short-wave communication in different directions; the vibrator adjusting devices (6) are configured in one-to-one correspondence with the variable vibrators (4) and are used for adjusting the lengths of the corresponding variable vibrators so as to realize working frequency tuning.

10. The method for adjusting the short-wave high-gain variable element multi-yagi antenna, according to claim 1, is characterized by comprising the following steps:

1) active oscillator length adjustment

Actually measuring the standing-wave ratio of the antenna through an impedance testing module;

continuously adjusting the length of the active oscillator until the current standing-wave ratio is less than or equal to 2: 1, wherein the length of the active oscillator is the optimal length;

2) adjustment of length of passive vibrator

Adjusting the length of the passive vibrator to a theoretical value according to theoretical calculation;

actually measuring the gain of the antenna by adopting an unmanned aerial vehicle antenna test system;

and continuously adjusting the length of each passive oscillator, and finding out the maximum value of the gain, wherein the length of the passive oscillator is the optimal length.

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