A 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna and automatic expansion and contraction method thereof

Abstract

The present invention discloses a 1.5MHz-30MHz fast automatic unfolding and retracting motorized rotating logarithmic periodic antenna and its automatic unfolding and retracting method. The antenna includes a mounting platform, an antenna lifting frame is arranged on the mounting platform, the antenna lifting frame includes two lifting rods arranged symmetrically on the left and right, a driving mechanism is fixedly installed on the top of one lifting rod, an antenna inverting mechanism is installed between the two lifting rods, and there is a rotating shaft on each side of the antenna inverting mechanism, and the rotating shafts on both sides are respectively erected on the top of the two lifting rods, and the rotating shaft on one side is also fixedly connected to the power output shaft of the above-mentioned driving mechanism. A horizontally inverted logarithmic periodic antenna is installed on the antenna inverting mechanism, and an antenna lifting rod and a lifting rod inverting mechanism and a control system for controlling the operation of the above-mentioned parts are also arranged on the mounting platform. The antenna disclosed by the present invention greatly improves the mobility of shortwave reconnaissance and communication under the premise of ensuring the stability of the shortwave full-band signal performance.

Description

Technical Field

[0001] The invention belongs to the field of communication, and particularly relates to a 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna and an automatic expansion and contraction method thereof in the field, which can be used for motorized communication and reconnaissance. Background Art

[0002] In recent years, the demand for mobile shortwave technical reconnaissance and communications has been increasing, but its development is very slow due to the technological stagnation of engineering equipment. Due to the long wavelength of the frequency band, the installation and erection of shortwave antennas requires a lot of manpower, material resources, and time, which leads to poor mobility and low efficiency of the platform. At present, the antennas used in most shortwave mobile platforms on the market are high-frequency bands or miniaturized antennas with loading designs. Although the mobility of the platform is improved, the electrical performance is poor and the antenna efficiency is low, making it difficult to effectively detect low-frequency bands and weak signals. In order to solve the problem of improving the mobility and efficiency of shortwave communications in the field of mobile reconnaissance, there is an urgent need for a mobile shortwave antenna that can cover the entire shortwave frequency band, is all-round, high-performance, and high-efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a 1.5MHz-30MHz fast automatic unfolding and retracting motorized rotating logarithmic periodic antenna and its automatic unfolding and retracting method which can cover the entire shortwave frequency band, all-round, high-efficiency and without human intervention.

[0004] The present invention adopts the following technical solution:

[0005] A 1.5MHz-30MHz fast automatic unfolding and retracting motorized rotating logarithmic periodic antenna, the improvement of which is that it includes a mounting platform, an antenna lifting frame is arranged on the mounting platform, the antenna lifting frame includes two lifting rods arranged symmetrically on the left and right, a driving mechanism is fixedly installed on the top of one lifting rod, an antenna inverting mechanism is installed between the two lifting rods, and the antenna inverting mechanism has a rotating shaft on each side, and the rotating shafts on both sides are respectively mounted on the tops of the two lifting rods, one of the rotating shafts is also fixedly connected to the power output shaft of the driving mechanism, and a horizontally inverted pair of lifting rods is installed on the antenna inverting mechanism. The invention discloses a logarithmic periodic antenna, wherein the logarithmic periodic antenna and the antenna inverting mechanism are locked or unlocked by an electric locking pin. An antenna lifting rod and a lifting rod inverting mechanism are also arranged on the installation platform. The antenna lifting rod and the lifting rod inverting mechanism are arranged opposite to each other, and are both retractable rod-shaped structures. The bottoms are both hinged to the installation platform. The top of the lifting rod inverting mechanism is hinged to the rod body of the antenna lifting rod. An antenna turntable is installed on the top of the antenna lifting rod. After the logarithmic periodic antenna is erected, the bottom can be installed on the antenna turntable and locked or unlocked by the electric locking pin. The invention also includes a control system for controlling the operation of the above-mentioned parts.

[0006] Furthermore, the two lifting rods of the antenna lifting frame are both circular lifting rods linked by multiple screws. The left and right lifting rods are driven independently to achieve left and right leveling under sensor feedback.

[0007] Furthermore, a bearing seat is fixedly installed on the top of the lifting rod where the driving mechanism is not installed, and the rotating shaft on one side of the antenna inverting mechanism is inserted into the bearing seat.

[0008] Furthermore, the log-periodic antenna is composed of an antenna surface, an unfolding and retracting truss and an automatic unfolding and retracting mechanism. The antenna vibrator adopts a dovetail log-periodic dipole, and the first longest vibrator adopts a three-wire vibrator.

[0009] Furthermore, a square connecting shaft is arranged on each side of the center position of the log-periodic antenna, and two square slide grooves are arranged opposite to each other on the antenna inverted mechanism. The square connecting shaft is above the square slide groove and can be embedded in the adjacent square slide groove. The two square connecting shafts and the adjacent square slide grooves are locked or unlocked by an electric locking pin.

[0010] Furthermore, the driving mechanism is a motor.

[0011] Furthermore, the antenna lifting rod is cut obliquely and fixed on the installation platform through a twisting mechanism, and is composed of a circular aluminum alloy extruded tube in a stacked manner and adopts a multi-stage screw pair transmission.

[0012] Furthermore, the lifting rod inverting mechanism is an electric cylinder.

[0013] Furthermore, the antenna turntable adopts a worm gear plus planetary reducer drive structure, a conical sleeve is arranged at the upper center of the antenna turntable, four through holes are arranged around the conical sleeve, four electric locking pins are respectively arranged at the lower part of the antenna turntable adjacent to the four through holes, a conical handle that can be inserted into the above-mentioned conical sleeve is arranged at the bottom center of the log-periodic antenna, four connecting shafts with locking pin holes at the bottom are arranged around the conical handle, the four connecting shafts can be respectively inserted into the above-mentioned four through holes, and the four electric locking pins can be respectively inserted into the locking pin holes of the four connecting shafts.

[0014] An automatic deployment method is applicable to the above antenna, wherein the antenna deployment step is as follows:

[0015] (1) Turn on the power so that the antenna is in a quasi-working state;

[0016] (2) The antenna lifting frame rises to lift the log-periodic antenna into place;

[0017] (3) The lifting rod inverting mechanism extends so that the antenna lifting rod is erected in place and locked;

[0018] (4) The driving mechanism drives the antenna inverted mechanism to rotate upward 90°, so that the log-periodic antenna is erected in place;

[0019] (5) The antenna lifting frame descends to lower the log-periodic antenna and dock and lock it with the antenna turntable;

[0020] (6) Release the lock between the log-periodic antenna and the antenna inversion mechanism;

[0021] (7) The antenna lifting frame descends to its initial position;

[0022] (8) The antenna mast rises to the working height;

[0023] (9) unfolding the log-periodic antenna;

[0024] (10) The log-periodic antenna automatically stops and locks after being deployed into position, and the deployment process ends;

[0025] The antenna retracting procedure is the opposite of the antenna deploying procedure.

[0026] The beneficial effects of the present invention are:

[0027] The antenna disclosed in the present invention greatly improves the mobility of shortwave reconnaissance and communication while ensuring the stability of the shortwave full-band signal performance. It fills the technical gap of the rapid deployment of large domestic antennas, and can apply shortwave antennas comparable to the performance of fixed stations to mobile platforms, and realizes rapid and automatic deployment. The installation and deployment time is shortened from 4 hours for similar products to 18 minutes, which greatly saves manpower and improves the efficiency of use. It can be used in the fields of communication and technical reconnaissance, especially in vehicle-mounted, ship-mounted, and airborne applications that have high requirements for antenna space, deployment time, and personnel operation.

[0028] The automatic unfolding and retracting method disclosed in the present invention is simple to operate, technically feasible, and reliable in application, and is easy for those skilled in the art to master and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the antenna disclosed in Embodiment 1 of the present invention;

[0030] Figure 2 is a schematic structural diagram of an antenna lifting frame in the antenna disclosed in Embodiment 1 of the present invention;

[0031] Figure 3 is a structural schematic diagram of an antenna inversion mechanism in the antenna disclosed in Embodiment 1 of the present invention;

[0032] Figure 4 is a schematic diagram of the structure of the logarithmic periodic antenna in the antenna disclosed in Embodiment 1 of the present invention;

[0033] Figure 5 is a schematic diagram of the antenna surface of the logarithmic periodic antenna in the antenna disclosed in Embodiment 1 of the present invention;

[0034] Figure 6 It is a schematic diagram of the antenna surface of the logarithmic periodic antenna in the antenna disclosed in Embodiment 1 of the present invention;

[0035] Figure 7 It is a structural schematic diagram of an antenna lifting rod and a lifting rod inverting mechanism in the antenna disclosed in Embodiment 1 of the present invention;

[0036] Figure 8 Schematic diagram I of the structure of the antenna turntable in the antenna disclosed in Embodiment 1 of the present invention;

[0037] Fig. 9 Schematic diagram II of the structure of the antenna turntable in the antenna disclosed in Embodiment 1 of the present invention;

[0038] Fig.10 It is a schematic diagram of the docking components between the antenna turntable and the log-periodic antenna in the antenna disclosed in Embodiment 1 of the present invention;

[0039] FIG11( a ) is a schematic diagram of step (1) in the automatic deployment method disclosed in Embodiment 1 of the present invention;

[0040] FIG11( b ) is a schematic diagram of step (2) in the automatic deployment method disclosed in Embodiment 1 of the present invention;

[0041] FIG11( c ) is a schematic diagram of step (3) in the automatic deployment method disclosed in Example 1 of the present invention;

[0042] FIG11( d ) is a schematic diagram of step (4) in the automatic deployment method disclosed in Example 1 of the present invention;

[0043] FIG11( e ) is a schematic diagram of step (5) in the automatic deployment method disclosed in Example 1 of the present invention;

[0044] FIG11( f ) is a schematic diagram of steps (6) to (7) in the automatic deployment method disclosed in Example 1 of the present invention;

[0045] FIG11( g) is a schematic diagram of step (8) in the automatic deployment method disclosed in Example 1 of the present invention;

[0046] FIG11( h ) is a schematic diagram of steps (9)-(10) in the automatic deployment method disclosed in Example 1 of the present invention.

[0047] Description of the drawings: 1—logarithmic periodic antenna, 11—square connecting axis, 12—antenna surface, 13—extension and retraction truss, 14—automatic extension and retraction mechanism, 15—antenna vibrator, 16—three-wire vibrator, 17—conical handle, 18—connecting axis, 181—locking pin hole, 2—antenna inverted erection mechanism, 21—motor, 22—square slide groove, 23—electric locking pin, 3—antenna lifting frame, 4—lifting rod inverted erection mechanism, 5—antenna turntable, 51—conical sleeve, 52—through hole, 53—electric locking pin, 6—antenna lifting rod, 7—installation platform. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] Embodiment 1, this embodiment discloses a 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna, such as Figure 1 As shown, it includes a mounting platform 7, on which an antenna lifting frame 3 is arranged, and the antenna lifting frame includes two lifting rods arranged symmetrically on the left and right, and a driving mechanism is fixedly installed on the top of one lifting rod, and the driving mechanism is a motor 21. Figure 2 As shown, an antenna inverting mechanism 2 is installed between two lifting rods, such as Figure 3 As shown, there is a rotating shaft on each side of the antenna inverting mechanism, and the rotating shafts on both sides are respectively mounted on the top of two lifting rods, one of which is also fixedly connected to the power output shaft of the above-mentioned driving mechanism. A horizontally inverted logarithmic periodic antenna 1 is installed on the antenna inverting mechanism, and the logarithmic periodic antenna and the antenna inverting mechanism are locked or unlocked by an electric locking pin. The antenna inverting mechanism is used to control the logarithmic periodic antenna to rotate within a range of 90°, so as to realize the 90° inverting action of the logarithmic periodic antenna and meet the automatic loading and unloading function; as shown Figure 7As shown, an antenna lifting rod 6 and a lifting rod inverting mechanism 4 are also arranged on the installation platform. The antenna lifting rod can make the logarithmic periodic antenna reach the specified working height, and the lifting rod inverting mechanism can realize the erection and storage of the antenna lifting rod; the antenna lifting rod and the lifting rod inverting mechanism are arranged opposite to each other, and are both retractable rod-shaped structures, and the bottoms are both hinged to the installation platform, and the top of the lifting rod inverting mechanism is hinged to the rod body of the antenna lifting rod. The top of the antenna lifting rod is installed with an antenna turntable 5. After the above-mentioned logarithmic periodic antenna is erected, the bottom can be installed on the antenna turntable and automatically locked or unlocked by an electric lock pin. The antenna turntable can make the logarithmic periodic antenna rotate 360 ​​degrees in all directions, and also includes a control system for controlling the work of the above-mentioned parts. The control system is composed of an antenna controller, a control cable, a sensor system, the above-mentioned controlled mechanism and device, etc., and completes the functions of automatic deployment and retraction control of the antenna, status information display, fault alarm, etc., and sets a logical lock to ensure safe operation. The operator can operate step by step through the control buttons on the controller panel, or perform "one-button" automatic operation. At the same time, the control system receives instructions from the host computer software through the serial port. The operator can directly issue action instructions to the controller through the terminal or the superior command system, realizing remote control of the antenna.

[0050] The two lifting rods of the antenna lifting frame are multi-threaded circular lifting rods, which can meet the closing / expanding height and load requirements. The left and right lifting rods are driven independently, and the left and right leveling of the log-periodic antenna can be achieved under the feedback of the sensor. The antenna lifting frame can control the automatic docking and separation of the log-periodic antenna and the antenna lifting rod.

[0051] A bearing seat is fixedly installed on the top of the lifting rod where the driving mechanism is not installed, and the rotating shaft on one side of the antenna inverted mechanism is inserted into the bearing seat to ensure balanced force on the left and right sides.

[0052] like Figure 4 As shown in FIG. 6 , the logarithmic periodic antenna is composed of an antenna surface 12, an unfolding truss 13 and an automatic unfolding mechanism 14. The unfolding truss is driven by the automatic unfolding mechanism to realize the automatic unfolding and retraction of the logarithmic periodic antenna surface. The variable parameter miniaturization design is adopted, and the antenna vibrator 15 uses a dovetail logarithmic periodic dipole, taking into account electrical and structural characteristics and high and low frequency performance. The first longest vibrator uses a three-wire vibrator 16 to further increase the antenna bandwidth and achieve the purpose of miniaturization.

[0053] A square connecting shaft 11 is arranged on both sides of the center position of the log-periodic antenna 1, and two square slide grooves 22 are arranged opposite to each other on the antenna inversion mechanism 2. The square connecting shaft is above the square slide groove and can be embedded in the adjacent square slide groove. The two square connecting shafts and the adjacent square slide grooves are locked or unlocked by an electric locking pin 23.

[0054] When the antenna is retracted, the antenna lifting frame rises, and the square connecting axis of the log-periodic antenna is inserted into the square slide groove of the antenna inverting mechanism, locked by an electric locking pin, and then realizes the inverting action together with the antenna inverting mechanism. The action is opposite when the antenna is erected, thereby realizing the automatic loading and unloading of the log-periodic antenna.

[0055] The antenna lifting rod is fixed on the installation platform by a canting mechanism. It is composed of circular aluminum alloy extruded tubes stacked in a telescopic manner and adopts a multi-stage screw pair transmission to meet the requirements of the closed height, unfolded height (15m) and load weight of the logarithmic periodic antenna.

[0056] The lifting rod inverting mechanism is an electric cylinder, and the electric cylinder of the lifting rod inverting mechanism pushes the antenna lifting rod to perform an inverted vertical action to achieve the inverted vertical requirement.

[0057] like Figure 8 As shown in FIG. 10 , the antenna turntable adopts a worm gear plus planetary reducer drive structure to meet the requirements of the log-periodic antenna for rotation at any position and self-locking. A cone sleeve 51 is provided at the upper center of the antenna turntable 5, and four through holes 52 are arranged around the cone sleeve. Four electric locking pins 53 are respectively provided at the lower part of the antenna turntable adjacent to the four through holes to realize the automatic docking and separation of the log-periodic antenna and the antenna turntable. A cone handle 17 that can be inserted into the above-mentioned cone sleeve 51 is provided at the bottom center of the log-periodic antenna 1, and four connecting shafts 18 with locking pin holes 181 at the bottom are arranged around the cone handle. The four connecting shafts can be respectively inserted into the above-mentioned four through holes, and the four electric locking pins can be respectively inserted into the locking pin holes of the four connecting shafts. The connection is convenient and quick, and the centering can be automatically realized.

[0058] The technical parameters and effects of the antenna disclosed in this embodiment are as follows:

[0059] Retractable form: automatic lifting, unfolding, folding; Maximum height from the ground: not less than 15m (adjustable downward); Polarization: horizontal polarization; Operating frequency: 1.5MHz~30MHz; Voltage standing wave ratio: ≤2.5; Antenna gain: ≥7dB (typical value);

[0060] Antenna front-to-back ratio: ≥10dB (typical value); power capacity: ≥1kW; antenna impedance: 50Ω; horizontal plane 3dB main lobe width: ≤80° (typical value); horizontal plane 6dB main lobe width: ≤120° (typical value); antenna rotation range: 0°~360° unlimited; antenna azimuth adjustment accuracy: not less than 2°; antenna erection time: ≤20min; antenna withdrawal time: ≤20min.

[0061] This embodiment also discloses an automatic deployment method, which is applicable to the above-mentioned antenna. The antenna deployment operation can be divided into a step-by-step operation and a one-button automatic operation, wherein the step-by-step operation steps are as follows:

[0062] (1) As shown in Figure 11(a), power is turned on to put the antenna in a quasi-working state;

[0063] (2) As shown in Figure 11(b), press the "antenna lifting frame up" button on the antenna controller, and the antenna lifting frame will rise so that the log-periodic antenna is lifted into place;

[0064] (3) As shown in Figure 11 (c), after the "Antenna Lifting Frame Raised to Position" indicator light on the antenna controller lights up, press the "Antenna Lifting Rod Up" button, and the lifting rod inverting mechanism extends so that the antenna lifting rod is erected to position and locked;

[0065] (4) As shown in FIG11( d ), after the “antenna lifting rod erected in place” indicator light on the antenna controller lights up, press the “antenna erection” button, and the driving mechanism drives the antenna inverted erection mechanism to rotate upward 90°, so that the log-periodic antenna is erected in place;

[0066] (5) As shown in Figure 11(e), after the “Antenna Upright” indicator light on the antenna controller lights up, press the “Antenna Lifting Frame Down” button, and the antenna lifting frame will descend, causing the log-periodic antenna to descend and dock and lock with the antenna turntable;

[0067] (6) As shown in Figure 11(f), after the “Turntable locked in place” indicator light on the antenna controller lights up, press the “Antenna unlock” button to release the lock between the log-periodic antenna and the antenna inversion mechanism;

[0068] (7) After the "Antenna Unlocked" indicator light on the antenna controller lights up, press the "Antenna Lifting Frame Down" button and the antenna lifting frame will descend to its initial position;

[0069] (8) As shown in Figure 11(g), after the antenna lifting frame is lowered into place, press the "antenna lifting rod up" button on the antenna controller to control the antenna lifting rod to rise to the working height;

[0070] (9) As shown in FIG11(h), after the antenna lifting rod is raised to the right position, press the “antenna deployment” button on the antenna controller to deploy the log-periodic antenna;

[0071] (10) After the log-periodic antenna is deployed into position, it automatically stops and locks, and the deployment process ends. The log-periodic antenna can be adjusted in position through the antenna controller and start working.

[0072] One-touch automatic operation: Press the "antenna automatic deployment" button and the antenna will automatically deploy according to the above steps.

[0073] The antenna retracting procedure is opposite to the antenna deploying procedure and will not be described here.

Claims

1. A 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna, characterized in that: The invention comprises an installation platform, on which an antenna lifting frame is arranged, the antenna lifting frame comprises two lifting rods arranged symmetrically on the left and right, a driving mechanism is fixedly installed on the top of one lifting rod, an antenna inverting mechanism is installed between the two lifting rods, two sides of the antenna inverting mechanism are provided with a rotating shaft, the rotating shafts on both sides are respectively mounted on the tops of the two lifting rods, one of the rotating shafts is also fixedly connected to the power output shaft of the above-mentioned driving mechanism, a horizontally inverted logarithmic periodic antenna is installed on the antenna inverting mechanism, the logarithmic periodic antenna and the antenna inverting mechanism are locked or unlocked by an electric locking pin, an antenna lifting rod and a lifting rod inverting mechanism are also arranged on the installation platform, the antenna lifting rod and the lifting rod inverting mechanism are arranged opposite to each other, both are retractable rod-shaped structures, the bottoms of which are both hinged to the installation platform, the top of the lifting rod inverting mechanism is hinged to the rod body of the antenna lifting rod, an antenna turntable is installed on the top of the antenna lifting rod, the bottom of the above-mentioned logarithmic periodic antenna can be installed on the antenna turntable after being erected and locked or unlocked by an electric locking pin, and a control system for controlling the operation of the above-mentioned parts is also included; The antenna deployment steps are: (1) Turn on the power so that the antenna is in a quasi-working state; (2) The antenna lifting frame rises to lift the log-periodic antenna into place; (3) The lifting rod inverting mechanism extends so that the antenna lifting rod is erected in place and locked; (4) The driving mechanism drives the antenna inverted mechanism to rotate upward 90°, so that the log-periodic antenna is erected in place; (5) The antenna lifting frame descends to allow the log-periodic antenna to descend and dock and lock with the antenna turntable; (6) Release the lock between the log-periodic antenna and the antenna inversion mechanism; (7) The antenna lifting frame descends to its initial position; (8) The antenna mast rises to the working height; (9) unfolding the log-periodic antenna; (10) The log-periodic antenna automatically stops and locks after being deployed into position, and the deployment process ends; The antenna retracting procedure is the opposite of the antenna deploying procedure.

2. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: The two lifting rods of the antenna lifting frame are both circular lifting rods linked by multiple threads. The left and right lifting rods are driven independently to achieve left and right leveling under the feedback of sensors.

3. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: A bearing seat is fixedly installed on the top of the lifting rod where the driving mechanism is not installed, and a rotating shaft on one side of the antenna inverted erection mechanism is inserted into the bearing seat.

4. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: The log-periodic antenna is composed of an antenna surface, an unfolding and retracting truss and an automatic unfolding and retracting mechanism. The antenna vibrator adopts a dovetail log-periodic dipole, and the first longest vibrator adopts a three-wire vibrator.

5. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: A square connecting shaft is arranged on both sides of the center position of the log-periodic antenna, and two square sliding grooves are arranged opposite to each other on the antenna inversion mechanism. The square connecting shaft is above the square sliding groove and can be embedded in the adjacent square sliding groove. The two square connecting shafts and the adjacent square sliding grooves are locked or unlocked by an electric locking pin.

6. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: The driving mechanism is a motor.

7. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: The antenna lifting rod is fixed on the installation platform by a tilting mechanism. It is composed of circular aluminum alloy extruded tubes stacked in a telescopic manner and adopts a multi-stage screw pair transmission.

8. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: The lifting rod inverting mechanism is an electric cylinder.

9. The 1.5MHz-30MHz fast automatic expansion and contraction motorized rotating logarithmic periodic antenna according to claim 1, characterized in that: The antenna turntable adopts a worm gear plus planetary reducer drive structure. A cone sleeve is set at the upper center of the antenna turntable, and four through holes are arranged around the cone sleeve. Four electric locking pins are respectively set at the lower part of the antenna turntable adjacent to the four through holes. A cone handle that can be inserted into the above cone sleeve is set at the bottom center of the logarithmic periodic antenna. Four connecting shafts with locking pin holes at the bottom are arranged around the cone handle. The four connecting shafts can be respectively inserted into the above four through holes, and the four electric locking pins can be respectively inserted into the locking pin holes of the four connecting shafts.

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