CN114256591B - An antenna - Google Patents
An antenna Download PDFInfo
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- CN114256591B CN114256591B CN202111632722.5A CN202111632722A CN114256591B CN 114256591 B CN114256591 B CN 114256591B CN 202111632722 A CN202111632722 A CN 202111632722A CN 114256591 B CN114256591 B CN 114256591B
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- antenna
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- reversing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/20—Resilient mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
- H01Q3/04—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Abstract
本发明实施例提供的一种天线，包括倒相器；所述倒相器包括骨架、第一倒相线圈和第二倒相线圈；所述第一倒相线圈沿第一方向绕制于所述骨架的第一端，所述第二倒相线圈沿第二方向绕制于所述骨架的第二端，所述第一倒相线圈和所述第二倒相线圈连接，所述第一方向与所述第二方向相反。通过将倒相器中的第一倒相线圈与第二倒相线圈沿两个相反的方向对骨架进行绕制沿两个方向绕制并且线圈中间衔接部分不断开，可以提高天线的增益，从而实现提高天线的通信效果。
An antenna provided by an embodiment of the present invention includes an inverter; the inverter includes a frame, a first inverted coil and a second inverted coil; the first inverted coil is wound on the first end of the frame along a first direction, the second inverted coil is wound on the second end of the frame along a second direction, the first inverted coil and the second inverted coil are connected, and the first direction is opposite to the second direction. By winding the frame along two opposite directions with the first inverted coil and the second inverted coil in the inverter and the connection part in the middle of the coil is not disconnected, the gain of the antenna can be improved, thereby improving the communication effect of the antenna.
Description
Technical Field
The present invention relates to the field of radio applications, and in particular to an antenna.
Background
With the development of economy and technology, antennas are components used to transmit or receive electromagnetic waves in the field of radio applications. Therefore, the quality of the antenna has an important impact on the radio communication.
The size of the existing antenna is large, so that the antenna is inconvenient to carry, and the performance of the antenna can be influenced by collision even in the transportation process. Moreover, the gain of the existing antenna is not high, so that the communication effect of the antenna is not good.
In summary, how to realize the convenience of carrying the antenna and improve the gain of the antenna is a technical problem to be solved currently.
Disclosure of Invention
The embodiment of the invention provides an antenna, which is used for solving the problems of inconvenient carrying and low antenna gain in the prior art.
In a first aspect, an embodiment of the present invention provides an antenna, including an inverter; the phase inverter comprises a framework, a first phase-inverting coil and a second phase-inverting coil; the first phase-reversing coil is wound at the first end of the framework along the first direction, the second phase-reversing coil is wound at the second end of the framework along the second direction, the first phase-reversing coil is connected with the second phase-reversing coil, and the first direction is opposite to the second direction.
In the embodiment of the invention, the coil in the phase inverter is wound along two directions, and the middle connecting part of the coil is not disconnected, so that the gain of the antenna can be improved, and the communication effect of the antenna is improved.
Optionally, the first phase-reversing coil and the second phase-reversing coil are connected in a U-shaped mode.
In the embodiment of the invention, the first phase-reversing coil and the second phase-reversing coil are not disconnected, but are connected in a U-shaped mode, so that the integrity of the coils is ensured, the gain of the antenna is improved, and the communication effect of the antenna is improved.
Optionally, the length of the first phase-reversing coil is equal to the length of the second phase-reversing coil.
In the embodiment of the invention, the length of the first phase-reversing coil is the same as that of the second phase-reversing coil, and the winding directions of the first phase-reversing coil and the second phase-reversing coil are opposite, and the first phase-reversing coil and the second phase-reversing coil are connected in a U-shaped manner, so that the gain of the antenna can be improved.
Optionally, the inverter further comprises a sleeve, the diameter of both ends of the sleeve being smaller than the diameter of the middle portion of the sleeve.
In the embodiment of the invention, the diameters of the two ends of the sleeve are smaller than the diameter of the middle part of the sleeve, so that the sleeve and the steel pipe radiator can be nested, and the stability of the antenna is improved.
Optionally, the antenna further comprises a deviator; the deviator is used for bending to change the orientation of the antenna.
In the embodiment of the invention, the direction of the antenna is changed by bending the deviator, so that not only can the omnidirectional communication of the antenna be realized, but also the antenna can be conveniently stored.
Optionally, the antenna further comprises at least one steel tube radiator, one end of which is nested with the first end or the second end of the inverter.
In the embodiment of the invention, the antenna comprises a plurality of steel pipe radiators, and the stability of the antenna can be improved by nesting the steel pipe radiators and the phase inverter.
Optionally, the antenna further comprises a retractor for connecting the at least one steel tube radiator and the inverter.
In the embodiment of the invention, the antenna can be stored by the contractor, so that the antenna is convenient to carry.
Optionally, the retractor comprises a bungee cord.
In the embodiment of the invention, the contractor connects at least one steel tube radiator and the phase inverter in the antenna together through the elastic rope, so that the antenna can be stored by utilizing the elasticity of the elastic rope when the antenna is not used.
Optionally, the steel tube radiator includes a first end and a second end, and the diameter of the first end of the steel tube radiator is greater than the diameter of the second end of the steel tube radiator.
In the embodiment of the invention, the large end of the steel pipe radiator is nested with the small end of the other steel pipe radiator, so that the two steel pipe radiators can be connected more tightly, and the stability of the antenna can be improved.
Optionally, the skeleton is made of a nonmetallic material, and the first phase-reversing coil and the second phase-reversing coil are made of insulating materials.
In the embodiment of the invention, the phase inverter framework and the phase inverter coil are made of specific materials, so that the gain of the antenna can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a franklin antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an inverter of a franklin antenna according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an antenna according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an inverter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an inverter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a connection method between a first inverter coil and a second inverter coil according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a connection method between a first inverter coil and a second inverter coil according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a connection method between a first inverter coil and a second inverter coil according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a connection between a first inverter coil and a second inverter coil according to an embodiment of the present invention;
FIG. 10 is a schematic diagram showing gain comparison between an antenna according to an embodiment of the present invention and a half-wave array in the same frequency band, franklin antenna;
FIG. 11 is a two-dimensional gain pattern of an antenna according to an embodiment of the present invention;
fig. 12 is a three-dimensional gain pattern of an antenna according to an embodiment of the present invention;
fig. 13 is a schematic structural view of a deviator according to an embodiment of the present invention;
FIG. 14 is a schematic view of a retractor according to an embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a matcher according to an embodiment of the present invention;
FIG. 16 is a circuit diagram of a matcher provided in an embodiment of the present invention;
FIG. 17 is a schematic diagram of a simulation report of input impedance of an antenna according to an embodiment of the present invention;
fig. 18 is a schematic diagram of a simulation report of antenna impedance matching according to an embodiment of the present invention;
fig. 19 is a schematic structural diagram of an antenna 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, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The basic function of the antenna is to convert the high-frequency current energy transmitted from the transmitter via the transmission line into radio waves and transmit the radio waves to a space; at the receiving end, the radio wave energy transmitted from the space is converted into high-frequency current energy which is transmitted to the receiver. The symmetrical array is a basic unit of the antenna, and the symmetrical array with each arm having a quarter wavelength and a half wavelength is called a half wavelength symmetrical array. The half-wavelength symmetric array is a basic unit for forming a plurality of practical antennas, and a plurality of half-wavelength dipole antennas are connected in series or in parallel to form a high-gain omnidirectional collinear antenna array, and the franklin antenna is a typical omnidirectional high-gain antenna.
Fig. 1 is a schematic diagram of a franklin antenna according to an embodiment of the present invention. The phase inverter of the franklin antenna adopts a concentrated parameter inductance principle to counteract reverse current, and the concentrated parameter inductance is wound in one direction of forward winding, backward winding, right-handed winding or left-handed winding, so that the gain of the franklin antenna is not high through detection. Fig. 2 is a schematic diagram of an inverter of a franklin antenna according to an embodiment of the present invention. And the franklin antenna is a whole in structure, and the antenna is large in size and inconvenient to carry.
In view of this, the embodiment of the invention provides an antenna, which can improve the gain of the antenna and make the antenna convenient to carry.
Fig. 3 is a schematic structural diagram of an antenna according to an embodiment of the present invention. The antenna 300 comprises a deviator 301, a retractor 302, a steel tube radiator 303, an inverter 304. Wherein inverter 304 includes a bobbin, a first inverter coil, and a second inverter coil. The first phase-reversing coil is wound on the first end of the framework along the first direction, the second phase-reversing coil is wound on the second end of the framework along the second direction, the first phase-reversing coil is connected with the second phase-reversing coil, and the first direction is opposite to the second direction.
Fig. 4 is a schematic diagram of an inverter according to an embodiment of the present invention. The inverter includes an inverter coil, a bobbin, and a sleeve. Wherein the inverter coil includes a first inverter coil and a second inverter coil. The phase-inverting coil in the phase inverter is made of insulating material and can be of diameterThe high temperature resistant insulated enamelled wire of (a) can also be a wire made of other materials, and is not limited herein. The skeleton in the phase inverter is non-metallic material, which can be low-loss, wear-resistant, mildew-resistant, corrosion-resistant and ageing-resistant, for example, the outer diameter isThe epoxy resin tube of (2) may be made of other nonmetallic materials, and is not limited herein. The sleeve in the phase inverter is a protective shell of the phase inverter, the middle part inside the sleeve is required to be provided with a framework and a phase-inverting coil, and two ends of the sleeve are required to be nested with the steel pipe radiator.
Fig. 5 is a schematic diagram showing an internal structure of an inverter according to an embodiment of the present invention. In one possible implementation, the length of the coils of the inverter is typically one-half the free space wavelength (i.e., 644 m), and the length of the first inverter coil is the same as the length of the second inverter coil, that is, the length of the first inverter coil is equal to one-fourth the free space wavelength (i.e., 322 m). The winding direction of the coil is that the first phase-reversing coil is wound around a quarter wavelength of the framework, and the second phase-reversing coil is wound around a quarter wavelength of the framework. And the first phase-reversing coil and the second phase-reversing coil are connected, so that the integrity of the coil in the phase-reversing device can be ensured, and the gain of the antenna is improved. Fig. 6 is a schematic diagram of a connection manner of a first inverter coil and a second inverter coil according to an embodiment of the present invention.
In a possible implementation manner, the connection between the first phase-reversing coil and the second phase-reversing coil may be a V-type connection, as shown in fig. 7, which is a schematic diagram of a connection manner between the first phase-reversing coil and the second phase-reversing coil according to an embodiment of the present invention. The first phase-reversing coil and the second phase-reversing coil are connected in a V-shaped mode, the integrity of the coils can be guaranteed, the coils are combined to be wound in two directions, the gain of the antenna can be improved, and the communication effect of the antenna is improved.
In a possible implementation manner, the connection between the first phase-reversing coil and the second phase-reversing coil may be a W-type connection, as shown in fig. 8, which is a schematic diagram of a connection manner between the first phase-reversing coil and the second phase-reversing coil provided in an embodiment of the invention. The first phase-reversing coil and the second phase-reversing coil are connected in a W-shaped mode, the integrity of the coils can be guaranteed, the coils are combined to be wound in two directions, the gain of the antenna can be improved, and the communication effect of the antenna is improved.
In a possible implementation manner, the connection between the first phase-reversing coil and the second phase-reversing coil may be point-to-point connection, as shown in fig. 9, which is a schematic diagram of a connection manner between the first phase-reversing coil and the second phase-reversing coil according to an embodiment of the present invention. The connection method of the first phase-reversing coil and the second phase-reversing coil is that one end point of the first phase-reversing coil is connected with one end point of the second phase-reversing coil, so that the integrity of the coils can be ensured, the coils are combined to wind in two directions, the gain of the antenna can be improved, and the communication effect of the antenna can be improved.
In a possible implementation, the lengths of the first and second inverter coils may be different, in particular the length of the first inverter coil is greater than the length of the second inverter coil. For example, the first inverter coil has a length of two-sixths of a wavelength (i.e., 426 m) and the second inverter coil has a length of one-sixth of a wavelength (i.e., 213 m).
In a possible implementation, the lengths of the first and second inverter coils may be different, in particular the length of the first inverter coil is smaller than the length of the second inverter coil. For example, the first inverter coil has a length of one-sixth wavelength (i.e., 213 m) and the second inverter coil has a length of two-sixth wavelength (i.e., 426 m).
In one possible implementation, the winding direction of the first phase-reversing coil and the second phase-reversing coil may be that the first phase-reversing coil is wound along a quarter wavelength of the skeleton, and the second phase-reversing coil is wound reversely along the quarter wavelength of the skeleton; the first phase-reversing coil can also be reversely wound along the quarter wavelength of the framework, and the second phase-reversing coil can be positively wound along the quarter wavelength of the framework; the first phase-reversing coil can also be wound along the quarter wavelength of the framework, and the second phase-reversing coil is wound along the quarter wavelength of the framework; the first phase-reversing coil can also be wound around the framework along the quarter wavelength, and the second phase-reversing coil is wound around the framework along the quarter wavelength.
In one possible implementation, the winding direction of the first phase-reversing coil and the second phase-reversing coil may be that the first phase-reversing coil is wound along two-sixth wavelength of the framework, and the second phase-reversing coil is wound reversely along one-sixth wavelength of the framework; the first phase-reversing coil can also be reversely wound along the two sixth wavelength of the framework, and the second phase-reversing coil can be positively wound along the one sixth wavelength of the framework; the first phase-reversing coil can also be wound along the two-sixth wavelength of the framework, and the second phase-reversing coil is wound along the one-sixth wavelength of the framework; the first phase-reversing coil can also be wound around the framework along the six-two wavelength of the framework, and the second phase-reversing coil is wound around the framework along the six-one wavelength of the framework.
In one possible implementation, the winding direction of the first phase-reversing coil and the second phase-reversing coil may be that the first phase-reversing coil is wound forward along one sixth wavelength of the skeleton, and the second phase-reversing coil is wound backward along two sixth wavelengths of the skeleton; the first phase-reversing coil can also be reversely wound along one sixth wavelength of the framework, and the second phase-reversing coil can be positively wound along two sixth wavelengths of the framework; the first phase-reversing coil can also be wound along the framework in the right direction of one sixth wavelength, and the second phase-reversing coil is wound along the framework in the left direction of two sixth wavelengths; the first phase-reversing coil can also be wound around a sixth wavelength of the framework, and the second phase-reversing coil is wound around a sixth wavelength of the framework.
Fig. 10 is a schematic diagram showing gain comparison between an antenna according to an embodiment of the present invention and a half-wave array in the same frequency band, franklin antenna. As can be seen from fig. 10, the gain of the antenna is about 1.7dBi higher than the gain of the half-wave array in the same frequency band, and the effect is remarkable. As shown in table 1, the gain of the antenna is compared with that of the half-wave array in the same frequency band.
Table 1 gain comparison table of antenna and half-wave array
As can be seen in fig. 10, the gain of the antenna is about 0.9dBi higher than the gain of the franklin antenna. That is to say, the two-way winding of the phase inverter in the antenna can greatly improve the gain of the antenna, thereby improving the communication effect of the antenna. As shown in table 2, gain comparison table of franklin antenna and antenna is shown.
Table 2 franklin antenna to antenna gain comparison table
Fig. 11 shows a two-dimensional gain pattern of an antenna according to an embodiment of the present invention. The antenna two-dimensional gain pattern has smooth surface and perfect shape. Fig. 12 shows a three-dimensional gain pattern of an antenna according to an embodiment of the present invention. The three-dimensional gain pattern of the antenna has smooth surface and full shape, and as can be seen from fig. 11 and 12, the antenna has higher gain and better communication effect.
Fig. 13 is a schematic structural diagram of a deviator according to an embodiment of the present invention. In the embodiment of the invention, the antenna comprises a deviator, and the deviator can be made of 304 stainless steel or other materials, and is not limited herein. The deviator is used for bending to change the orientation of the antenna. The biggest angle of buckling of deviator is 90 degrees of horizontal plane, can make the orientation of antenna set for the position through buckling the deviator like this, is convenient for realize the omnidirectional communication of antenna, also is convenient for accomodate of antenna.
Fig. 14 is a schematic structural view of a retractor according to an embodiment of the present invention. In an embodiment of the invention, the antenna comprises a retractor, wherein the retractor is used for connecting at least one steel tube radiator and an inverter. Wherein the retractor comprises a bungee cord, that is, the bungee cord is coupled to at least one steel tube radiator and an inverter. For example, when the antenna is changed from the unfolded state to the portable state, the elasticity of the elastic rope is required to be utilized, the elastic rope is pulled to the maximum extent, the nesting between the steel pipe radiator and between the steel pipe radiator and the phase inverter is manually released, the antenna is divided into a plurality of sections, and then the antenna can be conveniently carried by folding the antenna. In the case of the antenna from the unfolded state to the portable state, the nesting between the steel pipe radiator and the steel pipe radiator, and the nesting between the steel pipe radiator and the inverter are only broken, and the elastic cord is not broken. Therefore, when the antenna is changed from a portable state to an unfolding state, the elasticity of the elastic rope is utilized, the folded antenna is thrown by force, the diameter of one end of the steel pipe radiator is large, the diameter of the other end of the steel pipe radiator is small, and if the diameter of the first end of the steel pipe radiator is larger than that of the second end of the steel pipe radiator, the connection between the steel pipe radiator and the steel pipe radiator is realized by nesting the first end of the steel pipe radiator and the second end of the steel pipe radiator under the action of external force. The connection between the steel tube radiator and the inverter is by the action of external force nesting one end of the steel tube radiator with the first or second end of the inverter.
In one possible implementation, the first end of the steel pipe radiator is threaded with anti-friction threads, the second end of the steel pipe radiator is threaded with anti-friction threads corresponding to the first end, and both ends of the inverter are threaded with anti-friction threads corresponding to the first end. In this way, when the antenna changes from a portable state to an unfolding state, the folded antenna is thrown by force, the connection between the steel pipe radiator and the connection between the steel pipe radiator and the phase inverter can be firmer due to the friction-resistant threads, the stability of the antenna is improved, and the problem that the stability of the antenna is poor due to improper operation when the antenna is unfolded after being folded is prevented, and the performance of the antenna is affected.
In one possible implementation, the second end of the steel tube radiator is externally sleeved with anti-friction silica gel, and the two ends of the inverter are externally sleeved with anti-friction silica gel. In this way, when the antenna changes from a portable state to an unfolding state, the folded antenna is thrown by force, the connection between the steel pipe radiator and the connection between the steel pipe radiator and the phase inverter can be firmer due to the friction-resistant silica gel, the stability of the antenna is improved, and the problem that the stability of the antenna is poor due to improper operation when the antenna is unfolded after being folded is prevented, and the performance of the antenna is affected.
In a possible implementation manner, the diameters of the first end and the second end of the steel tube radiator are consistent, and the diameters of the two ends and the middle part of the phase inverter are also consistent, so that when the antenna is changed from the unfolded state to the portable state, the elasticity of the elastic rope is utilized to pull the elastic rope to the maximum extent, the antenna is divided into a plurality of sections, and then the antenna is convenient to carry by folding the antenna. When the antenna is changed from a portable state to an unfolding state, the elasticity of the elastic rope is utilized, the folded antenna is thrown by force, and the steel pipe radiator is connected with the steel pipe radiator through the elastic rope. The steel pipe radiator is connected with the phase inverter through elastic ropes.
In one possible implementation, the antenna may further comprise a matcher. Fig. 15 is a schematic structural diagram of a matcher according to an embodiment of the present invention. The matcher adopts the circuit diagram shown in fig. 16, can effectively match the input impedance z=r±jx of the antenna, the real part is near 50 ohms, the imaginary part is eliminated and is approximately 0, the ideal matching of the antenna circuit is realized, and the radiation efficiency of the antenna is optimized.
Fig. 17 is a schematic diagram of a simulation report of input impedance of an antenna according to an embodiment of the present application. As shown in fig. 18, a schematic diagram of a simulation report of antenna impedance matching is provided in an embodiment of the present application. The results of fig. 17 and 18 are combined to demonstrate that the antenna of the present application has an effect that meets the best operation requirement of radiation efficiency.
Fig. 19 is a schematic structural diagram of an antenna according to an embodiment of the present application. With respect to fig. 19, the various components of the antenna are identified by numerals in an embodiment of the present application. Wherein the component corresponding to the number "1" is a TNC-J head, the component corresponding to the number "2" is a lower sleeve, the component corresponding to the number "3" is a matcher, the component corresponding to the number "4" is a deviator support, the component corresponding to the number "5" is a deviator, the number "6" is a deviator support, the component corresponding to the number "7" is a steel pipe radiator, the component corresponding to the number "8" is a steel pipe radiator, the component corresponding to the number "9" is a steel pipe radiator support, the component corresponding to the number '10' is a telescopic device, the component corresponding to the number '11' is an inverter sleeve, the component corresponding to the number '12' is a framework, the component corresponding to the number '13' is an inverter coil, the component corresponding to the number '14' is a steel pipe radiator support, the component corresponding to the number '15' is a steel pipe radiator, the component corresponding to the number '16' is a steel pipe radiator, the component corresponding to the number '17' is a steel pipe radiator, and the component corresponding to the number '18' is an antenna cap.
Claims (9)
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| CN111585017A (en) * | 2020-05-15 | 2020-08-25 | 广东工业大学 | Normal mode helical antenna |
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| JP2007097119A (en) * | 2005-08-29 | 2007-04-12 | Toyota Industries Corp | Set substrate mounted with small-sized antenna |
| EP3376549B1 (en) * | 2015-12-25 | 2021-01-27 | Mitsui Chemicals, Inc. | Piezoelectric substrate, piezoelectric woven fabric, piezoelectric knitted fabric, piezoelectric device, force sensor, actuator, and biological information acquisition device |
| CN111525266B (en) * | 2020-04-03 | 2022-03-08 | 普联技术有限公司 | Antenna and wireless device |
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| CN111585017A (en) * | 2020-05-15 | 2020-08-25 | 广东工业大学 | Normal mode helical antenna |
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