CN112886223A - Very low frequency electromagnetic wave antenna and electromagnetic wave transceiver - Google Patents
Very low frequency electromagnetic wave antenna and electromagnetic wave transceiver Download PDFInfo
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- CN112886223A CN112886223A CN202110004375.5A CN202110004375A CN112886223A CN 112886223 A CN112886223 A CN 112886223A CN 202110004375 A CN202110004375 A CN 202110004375A CN 112886223 A CN112886223 A CN 112886223A
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Abstract
The embodiment of the invention discloses a very low frequency electromagnetic wave antenna and an electromagnetic wave transceiving device, wherein the antenna is composed of a piezoelectric material as an antenna main body, the antenna main body is a cylinder with a section of a preset geometric figure, and the circumference and the height of the cylinder of the geometric figure are set to meet a preset proportional relation, so that the antenna design of the very low frequency electromagnetic wave based on the piezoelectric material is realized, the size of the very low frequency electromagnetic wave antenna is reduced, and the use range of the very low frequency electromagnetic wave antenna is enlarged.
Description
Technical Field
The present disclosure relates to, but not limited to, wireless communication technologies, and more particularly, to a very low frequency electromagnetic wave antenna and an electromagnetic wave transceiver.
Background
Very low frequency (VLF, receiving frequency below 30 kilohertz (kHz)) electromagnetic waves are attenuated in the earth ionosphere waveguide by less than 6 decibels (db)/1000 kilometers (km) and can effectively penetrate sea water or dust. Therefore, the very low frequency electromagnetic wave transceiver has wide application prospect in deep sea, underground and long wave communication.
The size of the very low frequency electromagnetic wave antenna in the related art is equivalent to the wavelength of the electromagnetic wave, for example, the linear size of the conventional antenna capable of emitting the very low frequency electromagnetic wave is greater than 1 km, so the very low frequency electromagnetic wave antenna has the problems of large volume, large loss and the like, and is difficult to be installed on a general electromagnetic wave transceiver for use.
In summary, the conventional very low frequency electromagnetic wave antenna in the related art is generally too large in size, and cannot be mounted on a general electromagnetic wave transceiver.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
Embodiments of the present invention provide a very low frequency electromagnetic wave antenna and an electromagnetic wave transceiver, which can reduce the size of the very low frequency electromagnetic wave antenna.
The embodiment of the invention provides a very low frequency electromagnetic wave antenna, which comprises: an antenna main body;
the antenna main body is made of piezoelectric materials; the antenna main body is a cylinder, and the cross section of the cylinder is a preset geometric figure;
and the perimeter of the geometric figure and the height of the cylinder meet a preset proportional relation.
In one illustrative example, the piezoelectric material comprises a material that satisfies one or any combination of the following properties:
the piezoelectric coefficient is greater than a preset piezoelectric coefficient threshold value;
the quality factor Q value is larger than a preset quality factor threshold value;
the dielectric constant is larger than a preset dielectric constant threshold value.
In an illustrative example, the piezoelectric material comprises one or any combination of: piezoelectric ceramics, piezoelectric single crystals, and piezoelectric thin films.
In one illustrative example, the piezoelectric material comprises:
barium titanium silicate Ba2TiSi2O8Lead magnesium niobate Pb (Mg) with different proportions1-xNbx)O3Sm with a first preset concentration is doped with lead magnesium niobate Pb (Mg) with different proportions1-xNbx)O3Lead magnesium niobate titanate yPb (Mg) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0 to 1) and a second predetermined concentrationSm of the alloy is doped with lead magnesium niobate titanate yPb (Mg) with different mixture ratios1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1), lead niobate titanate yPb (Zn) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1) and lead zirconate titanate PbZr with different proportionsxTi1-xO3(x is 0-1), sodium bismuth titanate and potassium bismuth titanate (1-x) Na in different proportions1/2Bi1/ 2TiO3-xK1/2Bi1/2TiO3(x is 0-1) and sodium bismuth titanate barium titanate (1-x) Na in different proportions1/2Bi1/2TiO3-xBaTiO3(x-0 to 1), bismuth sodium titanate (Na)1/2Bi1/2)TiO3Zinc oxide ZnO, aluminum nitride AlN, sodium niobate NaNbO3Potassium niobate KNbO3Sodium tungstate NaWO3PVDF, alpha-BiB3O6Bismuth ferrite BiFeO3Barium titanate-calcium titanate and barium zirconate compound BaTiO3–CaTiO3–BaTiZrO3Different proportions of nickel bismuth titanate and lead zirconate titanate xBi (Ni)1/2Ti1/2)O3-(1-x)Pb(Zr1/2Ti1/2)O3Bismuth titanate BiTiO3Strontium titanate SrTiO3Potassium phosphate GaPO4Lithium borate Li2B4O7Lithium niobate LiNbO with same component and stoichiometric ratio3Alpha-silica alpha-SiO2Calcium aluminum silicate Ca2Al2SiO7Bismuth zinc borate Bi2ZnB2O7Yttrium aluminate YAlO3Yttrium chromate YCrO3Yttrium ferrite YFeO3Gallium lanthanum silicate series material, rare earth calcium oxygen borate RECa4O(BO3)3Series materials and rare earth calcium oxygen borate series materials.
In one illustrative example, the piezoelectric material comprises: lead zirconate titanate piezoelectric ceramic PZT.
In one illustrative example, the geometric figure comprises:
square, rectangular, circular or oval.
In an exemplary instance, the calculating that the perimeter of the geometric figure and the height of the cylinder satisfy a preset proportional relationship includes:
when the geometric figure is a square, the ratio of the perimeter of the square to the height of the column body is a first preset ratio;
and when the geometric figure is a circle, the ratio of the circumference of the circle to the height of the cylinder is a second preset ratio.
In an exemplary embodiment, the first preset ratio value range includes: 1: 10-4: 1.
In an exemplary embodiment, the second preset ratio value range includes: 1: 10-4: 1.
In one illustrative example, the very low frequency electromagnetic wave antenna comprises:
a d31 mode antenna oscillating in the X direction by applying an electric field in the Z direction, and a d33 mode antenna oscillating in the Z direction by applying an electric field in the Z direction.
In one illustrative example, the very low frequency electromagnetic wave antenna comprises: and the upper electrode and the bottom electrode are arranged on two end faces of the antenna main body.
In an exemplary embodiment, when the very low frequency electromagnetic wave antenna is a d31 mode antenna and the antenna body is a cylinder with a circular cross section, the upper electrode and/or the bottom electrode is circular or annular with a radius less than or equal to the radius of the cross section.
In one illustrative example, the ratio of the circumference of the circle to the height of the post comprises: 400: 1-4: 1.
On the other hand, an embodiment of the present invention further provides an electromagnetic wave transceiver, where the electromagnetic wave transceiver includes the very low frequency electromagnetic wave antenna.
The embodiment of the invention is composed of the piezoelectric material as the antenna main body, the antenna main body is a cylinder with the section of a preset geometric figure, and the circumference of the geometric figure and the height of the cylinder meet the preset proportional relation, so that the design of the very low frequency electromagnetic wave antenna based on the piezoelectric material is realized, the size of the very low frequency electromagnetic wave antenna is reduced, and the application range of the very low frequency electromagnetic wave antenna is enlarged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of an antenna body of a very low frequency electromagnetic wave antenna according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an antenna body of another VLF electromagnetic wave antenna according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the electric field of a piezoelectric material under an applied voltage according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the electric field of a piezoelectric material under an applied voltage according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of the resonant characteristics of a very low frequency electromagnetic wave antenna according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the resonant characteristics of another VLF electromagnetic wave antenna according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another very low frequency electromagnetic wave antenna according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the resonant characteristics of another VLF electromagnetic wave antenna according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the power of the radiated electromagnetic wave measured at different distances according to an embodiment of the present invention;
FIG. 10 is a diagram illustrating the relationship between the power of the radiated electromagnetic wave and the distance according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The embodiment of the invention provides a very low frequency electromagnetic wave antenna, which comprises: the antenna comprises an antenna body 1, wherein the antenna body 1 is made of piezoelectric materials and is a cylinder, and the cross section of the cylinder is a preset geometric figure;
wherein, the perimeter of the geometric figure and the height of the cylinder satisfy a preset proportional relation.
The very low frequency electromagnetic wave antenna provided by the embodiment of the invention emits electromagnetic waves after the electromagnetic waves are generated by polarization and dipoles.
In one illustrative example, the geometry in an embodiment of the invention comprises: square, circular, rectangular or oval. Fig. 1 is a schematic view of an antenna body of a very low frequency electromagnetic wave antenna according to an embodiment of the present invention, and as shown in fig. 1, the antenna body is a cylinder with a square cross section. Fig. 2 is a schematic view of an antenna body of another very low frequency electromagnetic wave antenna according to an embodiment of the present invention, and as shown in fig. 2, the antenna body is a cylinder with a circular cross section.
In an exemplary embodiment, when the geometric figure in the embodiment of the present invention is a square, a ratio of a side length of the square to a height of the pillar is a first preset ratio;
in an exemplary embodiment, when the geometric figure in the embodiment of the present invention is a circle, the ratio of the radius of the circle to the height of the cylinder is a second predetermined ratio.
In one illustrative example, the piezoelectric material comprises a material that satisfies one or any combination of the following properties:
the piezoelectric coefficient is greater than a preset piezoelectric coefficient threshold value;
the quality factor Q value is larger than a preset quality factor threshold value;
the dielectric constant is larger than a preset dielectric constant threshold value.
In an illustrative example, the piezoelectric material of the present invention includes one or any combination of the following: piezoelectric ceramics, piezoelectric single crystals, and piezoelectric thin films.
In the embodiment of the invention, in the example of the piezoelectric material, the parameter before the compound expression represents the mixture ratio of the compound, and the parameter at the lower right corner of each element in the compound represents the number of element atoms or atomic groups in the compound; for example, formula yPb (Mg)1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1) represents lead magnesium niobate titanate with different proportions; among them, the chemical Pb (Mg)1-xNbx) Former y and PbTiO3The former (1-y) denotes the ratio of the two compounds, Mg1-xThe lower right-hand corner parameter in (1) represents the number of magnesium elements. In the embodiments of the present invention, the values of x and y in different compounds are independent from each other and do not affect each other, and are not described herein again.
In one illustrative example, the piezoelectric material in the embodiment of the present invention includes:
barium titanium silicate Ba2TiSi2O8Lead magnesium niobate Pb (Mg) with different proportions1-xNbx)O3Samarium (Sm) with first preset concentration is doped with lead magnesium niobate Pb (Mg) with different proportions1-xNbx)O3Lead magnesium niobate titanate yPb (Mg) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1), and Sm with a second preset concentration is doped with lead magnesium niobate titanate yPb (Mg) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1), lead niobate titanate yPb (Zn) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1) and lead zirconate titanate PbZr with different proportionsxTi1-xO3(x is 0-1), sodium bismuth titanate and potassium bismuth titanate (1-x) Na in different proportions1/ 2Bi1/2TiO3-xK1/2Bi1/2TiO3(x is 0-1) and sodium bismuth titanate barium titanate (1-x) Na in different proportions1/2Bi1/2TiO3-xBaTiO3(x-0 to 1), bismuth sodium titanate (Na)1/2Bi1/2)TiO3Zinc oxide ZnO, aluminum nitride AlN, sodium niobate NaNbO3Potassium niobate KNbO3Sodium tungstate NaWO3PVDF, alpha-BiB3O6Bismuth ferrite BiFeO3Barium titanate-calcium titanate and barium zirconate compound BaTiO3–CaTiO3–BaTiZrO3Different proportions of nickel bismuth titanate and lead zirconate titanate xBi (Ni)1/2Ti1/2)O3-(1-x)Pb(Zr1/2Ti1/2)O3Bismuth titanate BiTiO3Strontium titanate SrTiO3Potassium phosphate GaPO4Lithium borate Li2B4O7Lithium niobate LiNbO with same component and stoichiometric ratio3Alpha-silica alpha-SiO2Calcium aluminum silicate Ca2Al2SiO7Bismuth zinc borate Bi2ZnB2O7Yttrium aluminate YAlO3Yttrium chromate YCrO3Yttrium ferrite YFeO3Lanthanum gallium silicate series materials (e.g. lanthanum gallium silicate La)3Ga5SiO14Thallium lanthanum gallate La3Ta0.5Ga5.5O14Lanthanum neodymium gallate La3Nb0.5Ga5.5O14Gallium lanthanum aluminate La3Ta0.5Ga5.3Al0.2O14Lanthanum neodymium gallium aluminate La3Nb0.5Ga5.3Al0.2O14Gallium neodymium strontium silicate Sr3NbGa3Si2O14Gallium, thallium and strontium silicate Sr3TaGa3Si2O14Gallium neodymium barium silicate Ca3NbGa3Si2O14Aluminum gallium thallium calcium silicate Ca with different component ratios3TaGa3-xAlxSi2O14(CTG3-xAxS), thallium calcium aluminum silicate Ca3TaAl3Si2O14) Rare earth calcium oxyborate RECa4O(BO3)3Series materials (rare earth calcium oxygen borate series materials can contain calcium oxygen yttrium borate YCa4O(BO3)3Calcium borate gadolinium oxide GdCa4O(BO3)3Calcium borate samarium oxide SmCa4O(BO3)3Calcium borate thulium oxide TmCa4O(BO3)3Calcium borate neodymium oxide NdCa4O(BO3)3Calcium borate praseodymium oxide PrCa4O(BO3)3Calcium borate lanthanum oxide LaCa4O(BO3)3) And rare earth calcium oxyborate series materials (e.g., Y)1-xGdxCa4O(BO3)3(x＝0～1))。
In an exemplary embodiment, the first predetermined concentration of the embodiment of the present invention may be 0.1% to 50%; in one illustrative example, the first predetermined concentration of an embodiment of the present invention may be 30%.
In an exemplary embodiment, the second predetermined concentration may be 0.1% to 50%; in an exemplary embodiment, the second predetermined concentration may be 30%.
It should be noted that the first predetermined concentration and the second predetermined concentration can be determined empirically by one skilled in the art.
In one illustrative example, the piezoelectric ceramic in the embodiment of the invention includes:
lead zirconate titanate piezoelectric ceramic (PZT).
In an exemplary embodiment, when the piezoelectric ceramic is lead zirconate titanate (PZT), the first predetermined ratio range includes: 1: 10-4: 1. In an exemplary embodiment, the first preset ratio may include: 2.7:9.6.
In an exemplary embodiment, when the piezoelectric ceramic is lead zirconate titanate (PZT), the second predetermined ratio range includes: 1: 10-4: 1. In an exemplary embodiment, the second preset ratio may include: 2.5:9.5.
In an exemplary embodiment, the very low frequency electromagnetic wave antenna of the embodiments of the present invention further includes: an upper electrode 2 and a bottom electrode 3; the upper electrode 2 and the bottom electrode 3 are respectively arranged on two end faces of the antenna main body; in an exemplary example, the upper electrode 2 and the bottom electrode 3 may be disposed at both ends of the antenna body in a plating manner.
In one illustrative example, an electrode in an embodiment of the invention includes: a first conductive material of a first predetermined thickness. In one illustrative example, the upper electrode includes: 100 nm thick platinum material. The purpose of the plated electrodes is to apply a voltage signal to the piezoelectric crystal.
In one illustrative example, a bottom electrode in accordance with embodiments of the present invention comprises: a second conductive material of a second predetermined thickness. In one illustrative example, the bottom electrode comprises: 100 nm thick platinum material. The bottom electrode is used for grounding.
It should be noted that the top electrode and the bottom electrode of the embodiments of the present invention may be made of other metals, such as copper.
FIG. 3 is a schematic diagram of an electric field of a piezoelectric material under an applied voltage according to an embodiment of the present invention, as shown in FIG. 3, when a voltage of 1V is applied to the top of the piezoelectric material, a closed electric field in a first direction is generated in a space around the piezoelectric material; FIG. 4 is a schematic diagram of an electric field of a piezoelectric material under an applied voltage according to another embodiment of the present invention, as shown in FIG. 4, when a voltage of-1V is applied to the top of the piezoelectric material, a closed electric field in a second direction is generated in the space around the piezoelectric material; according to maxwell's equations:
the variable electric field can generate a variable magnetic field, so that electromagnetic waves are emitted, and therefore, the electromagnetic waves can be emitted through the piezoelectric material; the frequency of the electromagnetic wave depends on the resonant frequency of the antenna composed of the piezoelectric material. Since the acoustic velocity of the antenna composed of the piezoelectric material is much smaller than that of the electromagnetic wave, the size of the antenna composed of the piezoelectric material at the resonance frequency can be small; in addition, antennas based on mechanically driven piezoelectric materials do not require additional bulky impedance matching.
In one illustrative example, a very low frequency electromagnetic wave antenna of an embodiment of the present invention comprises:
a mode antenna oscillating in the X direction by applying an electric field in the Z direction (d31), and a mode antenna oscillating in the X direction by applying an electric field in the Z direction (d 33).
It should be noted that Z and X are well known expressions that a person skilled in the art would know about antenna patterns; for different crystals, Z and X may take different values, which can be determined by the person skilled in the art with reference to the relevant theory.
In order to obtain higher radiation efficiency and concentrate the input power applied to the circuit of the antenna in the required frequency band range, the embodiment of the invention sets the size of the geometric figure and the height of the cylinder to meet the preset ratio relation when the antenna main body is the cylinder with the cross section of the preset geometric figure. By taking PZT as the piezoelectric material for forming the antenna main body as an example, the embodiment of the invention optimizes the size ratio of the piezoelectric material antenna; when the antenna body is a cylinder with a square cross section, the ratio of the side length of the square to the height of the cylinder may be 2.7:9.6, fig. 5 is a schematic diagram of the resonance characteristics of the very low frequency electromagnetic wave antenna according to the embodiment of the present invention, as shown in fig. 5, the dashed line in the diagram represents the quality factor (Q), the solid line curve represents the impedance in the length expansion mode, the resonance peak is found at the ultra-low frequency of 13.8 kilohertz (kHz), and the maximum Q value is in this band; when the antenna body is a cylinder with a circular cross section, the ratio of the radius of the circle to the height of the cylinder in the embodiment of the present invention may be 2.5:9.5, and fig. 6 is a schematic diagram of the resonance characteristics of another very low frequency electromagnetic wave antenna in the embodiment of the present invention, as shown in fig. 6, the dashed line in the diagram represents the quality factor (Q), the solid line curve represents the impedance in the length stretching mode, the resonance peak is found at the ultra-low frequency of 14kHz, and the maximum Q value is found in the band.
In an exemplary embodiment, when the very low frequency electromagnetic wave antenna of the embodiment of the invention is a d31 mode antenna, and the antenna body is a cylinder with a circular cross section, the upper electrode and/or the bottom electrode may be circular with a radius equal to the radius of the cylinder cross section, the upper electrode and/or the bottom electrode may be circular with a radius smaller than the radius of the cylinder cross section, or the upper electrode and/or the bottom electrode may be circular.
In an illustrative example, the ratio of the perimeter of the circle to the height of the cylinder in an embodiment of the invention includes: 400: 1-4: 1.
in an illustrative example, the cross-section of the antenna body of a very low frequency electromagnetic wave antenna is circular with a diameter of 9.5 cm, the height of the cylinder is 1.5 cm and the width of the loop is 2 cm. FIG. 7 is a schematic diagram of a very low frequency electromagnetic wave antenna according to another embodiment of the present invention, as shown in FIG. 7, wherein the upper electrode 2 and the lower electrode 3 are designed to have a ring structure; fig. 8 is a schematic diagram of the resonance characteristic of another very low frequency electromagnetic wave antenna according to an embodiment of the present invention, as shown in fig. 8, the dashed line in the diagram represents the quality factor (Q), the solid line curve represents the impedance of the length expansion mode, and the upper electrode 2 and the lower electrode 3 of the very low frequency electromagnetic wave antenna designed by using the ring structure obtain a stronger resonance mode at a frequency of 22.5kHz, so that the very low frequency electromagnetic wave can be emitted with maximum power.
In an exemplary embodiment, the antenna of the embodiment of the invention has the ratio of the circumference of the circle to the height of the cylinder of 314:3.6, and is prepared by adopting a method of plating electrodes by using an upper electrode and a bottom electrode, and the emission of the very low frequency electromagnetic wave of 26.14kHz is successfully realized through experiments. Similarly, the ratio of the circumference of the circle to the height of the column is 314:3.6, the feasibility of the antenna provided by the embodiment of the invention is further verified through the receiving antenna, and the embodiment of the invention provides technical support for further development of underwater communication. FIG. 9 is a schematic diagram of the power of the radiated electromagnetic wave measured at different distances according to the embodiment of the present invention, as shown in FIG. 9, the bandwidth of the electromagnetic wave signal of the antenna according to the embodiment of the present invention is>40Hz, and the bandwidth of the antenna does not change along with the transmission of the distance, and the antenna has wide application prospect in the field of underwater communication. The power of the very low frequency electromagnetic wave at the frequency of 26.14kHz is increased. FIG. 10 is a schematic diagram showing the relationship between the power of the electromagnetic wave radiated by the embodiment of the present invention and the distance, as shown in FIG. 10, the power of the electromagnetic wave radiated by the embodiment of the present invention is 1/r with the distance3Is close to the theoretical value. The very low frequency electromagnetic wave antenna of the embodiment of the invention does not need an additional impedance matching circuit and is simple to prepare; the antenna has simple structure and lower process requirement precision, and reduces the cost; the size is small, and the carrying is convenient; the ultra-low frequency electromagnetic wave penetration capability is enhanced along with the increase of the wavelength, and the ultra-low frequency electromagnetic wave penetration capability is used in submarine communication and can increase the concealment of a submarine. Based on piezo-electric effect and piezo-electric drive, compared with the same size antennaThe piezomagnetic antenna efficiency is about two orders of magnitude higher.
The embodiment of the invention is composed of a piezoelectric material as an antenna main body, the antenna main body is a cylinder with a section of a preset geometric figure, and the parameter for calculating the perimeter of the geometric figure and the height of the cylinder meet a preset proportional relation, so that the antenna design of the very low frequency electromagnetic wave based on the piezoelectric material is realized, the size of the very low frequency electromagnetic wave antenna is reduced, and the application range of the very low frequency electromagnetic wave antenna is enlarged.
The embodiment of the invention also provides an electromagnetic wave transceiving device, which comprises the very low frequency electromagnetic wave antenna.
In an exemplary embodiment, the electromagnetic wave transceiving apparatus according to an embodiment of the present invention further includes one or any of the following: the device comprises a modulator, a voltage amplifier, a transmitting-receiving antenna, a preposed voltage amplifier and a demodulator; wherein the content of the first and second substances,
the modulator has a modulation function, and the modulation is carried out in a frequency shift keying mode, namely, the frequency of the carrier wave is utilized to transmit the information number along with the change of the digital baseband signal;
the voltage amplifier is arranged to: the modulated micro-signal voltage is converted into a high-voltage signal, so that the radiation power of the transmitting antenna is improved conveniently. The micro-signal comprises a signal output by a modulator debug.
The receiving and transmitting antenna is set as follows: the high-voltage amplified electric signal is converted into an electromagnetic wave, radiated into space, and receives the electromagnetic wave with the same frequency from the space.
The pre-voltage amplifier is set as follows: the low-voltage signal converted from the electromagnetic wave received by the receiving antenna coil is converted into a high-voltage signal, so that the subsequent demodulation processing is facilitated;
the demodulator is arranged to: and demodulating the modulated carrier to obtain the original baseband signal.
"one of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art. "
Claims (14)
1. A very low frequency electromagnetic wave antenna comprising: an antenna main body;
the antenna main body is made of piezoelectric materials; the antenna main body is a cylinder, and the cross section of the cylinder is a preset geometric figure;
and the perimeter of the geometric figure and the height of the cylinder meet a preset proportional relation.
2. A very low frequency electromagnetic wave antenna according to claim 1, wherein said piezoelectric material comprises a material satisfying one or any combination of the following properties:
the piezoelectric coefficient is greater than a preset piezoelectric coefficient threshold value;
the quality factor Q value is larger than a preset quality factor threshold value;
the dielectric constant is larger than a preset dielectric constant threshold value.
3. A very low frequency electromagnetic wave antenna according to claim 2, wherein said piezoelectric material comprises one or any combination of: piezoelectric ceramics, piezoelectric single crystals, and piezoelectric thin films.
4. A very low frequency electromagnetic wave antenna according to claim 3, wherein said piezoelectric material comprises:
barium titanium silicate Ba2TiSi2O8Lead magnesium niobate Pb (Mg) with different proportions1-xNbx)O3Sm with a first preset concentration is doped with lead magnesium niobate Pb (Mg) with different proportions1-xNbx)O3Lead magnesium niobate titanate yPb (Mg) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1), and Sm with a second preset concentration is doped with lead magnesium niobate titanate yPb (Mg) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1), lead niobate titanate yPb (Zn) with different proportions1-xNbx)O3-(1-y)PbTiO3(x, y is 0-1) and lead zirconate titanate PbZr with different proportionsxTi1-xO3(x is 0-1), sodium bismuth titanate and potassium bismuth titanate (1-x) Na in different proportions1/2Bi1/2TiO3-xK1/ 2Bi1/2TiO3(x is 0-1) and sodium bismuth titanate barium titanate (1-x) Na in different proportions1/2Bi1/2TiO3-xBaTiO3(x-0 to 1), bismuth sodium titanate (Na)1/2Bi1/2)TiO3Zinc oxide ZnO, aluminum nitride AlN, sodium niobate NaNbO3Potassium niobate KNbO3Sodium tungstate NaWO3PVDF, alpha-BiB3O6Bismuth ferrite BiFeO3Barium titanate-calcium titanate and barium zirconate compound BaTiO3–CaTiO3–BaTiZrO3Different proportions of nickel bismuth titanate and lead zirconate titanate xBi (Ni)1/2Ti1/2)O3-(1-x)Pb(Zr1/ 2Ti1/2)O3Bismuth titanate BiTiO3Strontium titanate SrTiO3Potassium phosphate GaPO4Lithium borate Li2B4O7Lithium niobate LiNbO with same component and stoichiometric ratio3Alpha-silica alpha-SiO2Calcium aluminum silicate Ca2Al2SiO7Bismuth zinc borate Bi2ZnB2O7Yttrium aluminate YAlO3Yttrium chromate YCrO3Yttrium ferrite YFeO3Gallium lanthanum silicate series material, rare earth calcium oxygen borate RECa4O(BO3)3Series materials and rare earth calcium oxygen borate series materials.
5. A very low frequency electromagnetic wave antenna according to claim 2, wherein said piezoelectric material comprises: lead zirconate titanate piezoelectric ceramic PZT.
6. A very low frequency electromagnetic wave antenna according to any one of claims 1 to 5, wherein said geometric figure comprises:
square, rectangular, circular or oval.
7. A very low frequency electromagnetic wave antenna according to claim 6, wherein said means for calculating that the perimeter of said geometric figure and the height of said pillar satisfy a predetermined proportional relationship comprises:
when the geometric figure is a square, the ratio of the perimeter of the square to the height of the column body is a first preset ratio;
and when the geometric figure is a circle, the ratio of the circumference of the circle to the height of the cylinder is a second preset ratio.
8. A very low frequency electromagnetic wave antenna according to claim 7, wherein said first predetermined range of values of the ratio comprises: 1: 10-4: 1.
9. A very low frequency electromagnetic wave antenna according to claim 7, wherein said second predetermined range of values of the ratio comprises: 1: 10-4: 1.
10. A very low frequency electromagnetic wave antenna according to claim 7, characterized in that it comprises:
a d31 mode antenna oscillating in the X direction by applying an electric field in the Z direction, and a d33 mode antenna oscillating in the Z direction by applying an electric field in the Z direction.
11. A very low frequency electromagnetic wave antenna according to claim 10, characterized in that it further comprises: and the upper electrode and the bottom electrode are arranged on two end faces of the antenna main body.
12. A very low frequency electromagnetic wave antenna according to claim 11, wherein said very low frequency electromagnetic wave antenna is a d31 mode antenna, and when said antenna body is a cylinder having a circular cross-section, said upper electrode and/or said bottom electrode is circular or annular having a radius less than or equal to said cross-section radius.
13. A very low frequency electromagnetic wave antenna according to claim 12, wherein a ratio of a perimeter of said circle to a height of said pillar comprises: 400: 1-4: 1.
14. An electromagnetic wave transceiver, characterized in that the electromagnetic wave transceiver comprises the very low frequency electromagnetic wave antenna according to claims 1-13.
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