An amplitude shift keying low-frequency transmitting antenna based on magnetic phase change material

Abstract

The present invention discloses an amplitude-shift keying (ASK) low-frequency transmitting antenna based on a magnetic phase-change material. The antenna comprises an electromagnetic shielding box, a magnetic phase-change cover plate mounted on the top surface of the box, a control mechanism mounted on one side of the box, and a rotating antenna connected to the inside of the box via a drive mechanism. The invention achieves independent, high-speed modulation of the amplitude of low-frequency electromagnetic waves, thereby creating an ASK low-frequency transmitting antenna with excellent signal readability and a high modulation rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-frequency communications, and in particular relates to an amplitude-shift keying low-frequency transmitting antenna based on magnetic phase change materials. Background Art

[0002] Existing low-frequency transmitting antennas widely use frequency-shift keying (FSK) modulation schemes, while amplitude-shift keying (ASK) modulation schemes are rarely used. This is because for rotating low-frequency transmitting antennas, existing ASK modulation schemes require changing the rotational speed of the antenna to alter the amplitude of the electromagnetic wave. Changing the rotational speed also changes the frequency of the electromagnetic wave, resulting in coupled amplitude and frequency modulation, and poor signal readability. Furthermore, existing drive devices (such as servo motors) have difficulty achieving high-frequency switching due to inertia, resulting in a low modulation rate.

[0003] Therefore, there is an urgent need for an amplitude shift keying low-frequency transmitting antenna based on magnetic phase change material to solve the problems of poor signal readability and low modulation rate of the existing amplitude shift keying modulation scheme. Summary of the Invention

[0004] The purpose of the present invention is to provide an amplitude shift keying low frequency transmitting antenna based on magnetic phase change material to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides an amplitude shift keying low-frequency transmitting antenna based on magnetic phase change material, comprising an electromagnetic shielding box, a magnetic phase change cover plate is installed on the top surface of the electromagnetic shielding box, a control mechanism is installed on one side of the electromagnetic shielding box, and a rotating antenna is connected to the inside of the electromagnetic shielding box through a drive mechanism.

[0006] Preferably, the magnetic phase change cover plate includes two ferroelectric substrates, a magnetic phase change material is provided between the two ferroelectric substrates, and the ferroelectric substrate is electrically connected to the driving mechanism.

[0007] Preferably, the driving mechanism includes a connecting plate fixedly connected to the electromagnetic shielding box, one end of the connecting plate is fixedly connected to a driving motor, the driving motor is fixedly connected to the rotating antenna, and the driving motor is electrically connected to the ferroelectric substrate.

[0008] Preferably, the control mechanism includes a display screen and a rotary button.

[0009] Preferably, the electromagnetic shielding box is made of electromagnetic shielding material.

[0010] The present invention discloses the following technical effects: the rotating antenna always rotates at a constant speed and a constant direction without changing the rotation speed, thereby avoiding the problem of poor signal readability caused by frequency and amplitude coupling during the modulation process, and at the same time avoiding damage to the driving mechanism caused by frequent speed switching and large equipment noise; the magnetic phase change characteristics of the magnetic phase change material are used for amplitude modulation of the low-frequency transmitting antenna. Since the magnetic phase change material is extremely sensitive to external excitation near the phase change point, the time required for the magnetic change is extremely short and almost negligible, which greatly accelerates the modulation speed, thereby increasing the data transmission rate and improving the communication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0012] Figure 1 Schematic diagram of the internal structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the external structure of the present invention;

[0014] Figure 3 Schematic diagram of the structure of the control mechanism of the present invention.

[0015] In the figure: 1. Electromagnetic shielding box; 2. Rotating antenna; 3. Driving mechanism; 4. Magnetic phase change cover; 5. Control mechanism; 6. Display screen; 7. Rotating button. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Reference Figure 1-3 As shown, the present invention provides an amplitude shift keying low-frequency transmitting antenna based on magnetic phase change material, including an electromagnetic shielding box 1, a magnetic phase change cover 4 is installed on the top surface of the electromagnetic shielding box 1, a control mechanism 5 is installed on one side of the electromagnetic shielding box 1, and a rotating antenna 2 is connected to the electromagnetic shielding box 1 through a driving mechanism 3.

[0019] The rotating antenna 2 always rotates at a constant speed and a constant direction without changing the rotation speed, avoiding the problem of poor signal readability caused by the coupling of frequency and amplitude during the modulation process, and at the same time avoiding the damage to the driving mechanism 3 caused by frequent switching speeds and large equipment noise; the magnetic phase change characteristics of the magnetic phase change material are used for amplitude modulation of the low-frequency transmitting antenna. Since the magnetic phase change material is extremely sensitive to external excitation near the phase change point, the time required for the magnetic change is extremely short and almost negligible, which greatly speeds up the modulation speed, thereby increasing the data transmission rate and improving the communication effect.

[0020] According to a further optimized solution, the magnetic phase change cover plate 4 includes two ferroelectric substrates, a magnetic phase change material is provided between the two ferroelectric substrates, and the ferroelectric substrate is electrically connected to the driving mechanism 3 .

[0021] The electric field is used to induce the electric field to produce a piezoelectric effect in the ferroelectric substrate. Through effective coupling between the ferroelectric substrate and the magnetic phase change material interface and efficient stress transfer, the magnetization intensity of the magnetic phase change material changes dramatically, thereby achieving a controllable shielding effect on the electromagnetic waves generated by the low-frequency transmitting antenna.

[0022] The magnetic phase change properties of magnetic phase change materials are used for amplitude modulation of low-frequency transmitting antennas. Since magnetic phase change materials are extremely sensitive to external excitation near the phase change point, the time required for magnetic changes is extremely short and almost negligible, which greatly speeds up the modulation speed, thereby increasing the data transmission rate and improving the communication effect.

[0023] According to a further optimized solution, the driving mechanism 3 includes a connecting plate fixedly connected to the electromagnetic shielding box 1 , one end of the connecting plate is fixedly connected to a driving motor, the driving motor is fixedly connected to the rotating antenna 2 , and the driving motor is electrically connected to the ferroelectric substrate.

[0024] According to a further optimized solution, the control mechanism 5 includes a display screen 6 and a rotary button 7 .

[0025] According to a further optimized solution, the electromagnetic shielding box 1 is made of electromagnetic shielding material.

[0026] During operation, drive mechanism 3 begins to drive rotating antenna 2 to rotate at a constant rate and constant direction. The control module decodes the transmitted signal into a binary digital signal consisting of "0" and "1". When the desired digital signal output is "0", control mechanism 5 applies an electric field to the ferroelectric substrate of magnetic phase change cover plate 4, causing a piezoelectric effect in the ferroelectric substrate. The resulting stress causes the magnetic phase change material to undergo a magnetic phase change, from antiferromagnetic to ferromagnetic, dramatically increasing the magnetization intensity and significantly enhancing the shielding effect against the low-frequency electromagnetic waves radiated by rotating antenna 2. At this time, the amplitude of the low-frequency electromagnetic waves radiated by the entire device is relatively small, representing the digital signal "0". Similarly, when the digital signal to be output is "1", the applied electric field is removed, the piezoelectric effect of the ferroelectric substrate disappears, and stress is no longer applied to the magnetic phase change material. The magnetic phase change material undergoes a magnetic phase change, changing from antiferromagnetic to ferromagnetic, and the magnetization intensity is drastically reduced. The shielding effect on the low-frequency electromagnetic waves radiated by the rotating antenna 2 is greatly weakened. At this time, the amplitude of the low-frequency electromagnetic waves radiated by the entire device is relatively large, which can represent the digital signal "1". The combination of two electromagnetic waves with different amplitudes realizes amplitude shift keying modulation of the low-frequency transmitting antenna.

[0027] When the present invention is used, the user long presses the rotary button 7 to start working, and the user selects functions and message content by rotating the rotary button 7 and performs visual interaction through the display screen 6.

[0028] Because the free energies of the two magnetic phases of a magnetic phase-change material are very close near the phase transition point, even small external excitations can trigger a phase transition, thereby changing the magnetic properties. Furthermore, since magnetic properties are related to the electromagnetic shielding effect, the shielding degree of the magnetic phase-change material can be altered. Therefore, the present invention modulates the phase transition point of the magnetic phase-change material to near room temperature, uses an electric field to induce a piezoelectric effect in the ferroelectric substrate, and leverages effective coupling and efficient stress transfer at the ferroelectric substrate-magnetic phase-change material interface to dramatically change the magnetization intensity of the magnetic phase-change material, thereby achieving a controllable shielding effect against electromagnetic waves generated by low-frequency transmitting antennas.

[0029] At the same time, the present invention uses a drive mechanism 3 to drive the rotating antenna 2 to rotate at a constant rate and constant direction to radiate low-frequency electromagnetic waves. The control mechanism 5 controls the shielding effect of the cover plate on the electromagnetic waves, controlling the amplitude of the low-frequency electromagnetic waves at a given moment to represent the "0" or "1" of the digital signal, thereby achieving amplitude shift keying modulation of the low-frequency transmitting antenna signal. This does not require changing the rotation speed of the drive mechanism 3, thereby avoiding the problem of poor signal readability caused by frequency and amplitude coupling during the modulation process. In addition, because the time required for the phase change of the magnetic phase change material is extremely low, far less than the time required for the speed switching of the existing drive mechanism 3, the amplitude shift keying modulation scheme of the present invention solves the problems of poor signal readability and low modulation rate of existing amplitude shift keying modulation schemes.

[0030] The present invention utilizes the rotating antenna 2 to radiate low-frequency electromagnetic waves, combines the magnetic phase change characteristics of the magnetic phase change material, the shielding effect of magnetism on electromagnetic waves and the piezoelectric effect of the ferroelectric substrate, to achieve independent and high-speed modulation of the amplitude of the low-frequency electromagnetic waves, and forms an amplitude shift keying low-frequency transmitting antenna with excellent signal readability and high modulation rate.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An amplitude shift keying low-frequency transmitting antenna based on magnetic phase change material, characterized by: The electromagnetic shielding box (1) comprises an electromagnetic shielding box (1), a magnetic phase change cover plate (4) is installed on the top surface of the electromagnetic shielding box (1), a control mechanism (5) is installed on one side of the electromagnetic shielding box (1), and a rotating antenna (2) is connected to the electromagnetic shielding box (1) via a driving mechanism (3); The magnetic phase change cover plate (4) comprises two ferroelectric substrates, a magnetic phase change material is provided between the two ferroelectric substrates, and the ferroelectric substrate is electrically connected to the driving mechanism (3); The driving mechanism (3) comprises a connecting plate fixedly connected to the electromagnetic shielding box (1), one end of the connecting plate being fixedly connected to a driving motor, the driving motor being fixedly connected to the rotating antenna (2), and the driving motor being electrically connected to the ferroelectric substrate.

2. The amplitude shift keying low frequency transmitting antenna based on magnetic phase change material according to claim 1, characterized in that: The control mechanism (5) comprises a display screen (6) and a rotary button (7).

3. The amplitude shift keying low frequency transmitting antenna based on magnetic phase change material according to claim 1, characterized in that: The electromagnetic shielding box (1) is made of electromagnetic shielding material.

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