Yagi antenna and communication device

Abstract

The application relates to a Yagi antenna and a communication device. The Yagi antenna comprises a substrate, the substrate has opposite first and second surfaces, an antenna body, the antenna body is arranged on the first surface of the substrate and comprises a reflector and a driver, and a plurality of dielectric resonators, the dielectric resonators are arranged along the axial direction of the substrate to form a dielectric resonator array, wherein a separation sheet is arranged between two adjacent dielectric resonators, the dielectric resonator array is located on the first surface of the substrate and is adjacent to the driver. The communication device comprises the Yagi antenna. By adding the separation sheet and the design of the dielectric resonator with a TE111 oscillation mode, the dielectric resonator array composed of the separation sheet and the plurality of dielectric resonators is adopted, the interval between the dielectric resonators is reduced under the premise of ensuring the unchanged radiation performance, the overall size of the Yagi antenna is effectively reduced, and the miniaturization degree of the Yagi antenna is improved.

Description

A Yagi antenna and communication device Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a Yagi antenna and communication device. Background Technology

[0002] With the rapid development of wireless communication, higher demands are being placed on antenna performance, including miniaturization, wide bandwidth, and low loss. Yagi antennas possess excellent directivity and, compared to traditional dipole antennas, offer higher gain. Yagi antennas excel in both direction finding and long-distance communication, thus they have been extensively studied and widely applied.

[0003] However, the traditional Yagi antenna is based on an array of electric dipoles plus an array of multiple parasitic antennas. In order to reduce the mutual coupling between the parasitic antennas, the spacing between the parasitic antennas is very large, which makes the traditional Yagi antenna very large and not compact. Summary of the Invention

[0004] The present invention provides a Yagi antenna and communication device, which aims to solve the technical problem in the prior art that the antenna size is large due to the large spacing between parasitic antennas.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this embodiment of the invention is to provide a Yagi antenna. The Yagi antenna includes: a substrate having opposing first and second surfaces; an antenna body disposed on the first surface of the substrate, including a reflector and a driver; and a plurality of dielectric resonators arranged along the axial direction of the substrate to form a dielectric resonator array.

[0006] An isolation sheet is provided between two adjacent dielectric resonators, and the dielectric resonator array is located on the first surface of the substrate, adjacent to the driver.

[0007] In some embodiments, the oscillation mode of the dielectric resonator is the magnetic dipole TE111 mode.

[0008] In some embodiments, the insulating sheet is attached to the adjacent dielectric resonator to form a magnetic wall between two adjacent dielectric resonators.

[0009] In some embodiments, the antenna body further includes: a signal post; the signal post is disposed at one end of the substrate away from the dielectric resonator array; and a microstrip; the microstrip is disposed on a first surface of the substrate and connects the signal post and the driver.

[0010] In some embodiments, the signal post extends through the substrate and has a first end and a second end that are spaced apart from each other;

[0011] The first end is located on the first surface and is connected to the microstrip; the second end is located on the second surface.

[0012] In some embodiments, the antenna body further includes a balun disposed on a first surface of the substrate, located between the microstrip and the driver.

[0013] In some embodiments, the driver consists of a first metal strip and a second metal strip; the first metal strip and the second metal strip are arranged side by side on the first surface of the substrate and are respectively connected to two connecting portions of the balun.

[0014] In some embodiments, the reflector consists of a strip-shaped third metal strip and a fourth metal strip;

[0015] The third and fourth metal strips are arranged side by side on the first surface of the substrate, located between the driver and the balun.

[0016] In some embodiments, the reflector and the driver have a first preset distance; the dielectric resonator array and the driver have a second preset distance.

[0017] Optionally, the insulating sheet is made of a material with a high dielectric constant.

[0018] Optionally, the thickness of the insulating sheet should be less than 0.15λ, where λ is the wavelength of the signal radiated by the Yagi antenna.

[0019] Optionally, the magnetic wall formed by the insulating sheet is used to transfer energy and to prevent coupling between the various dielectric resonators.

[0020] Optionally, the substrate includes: a first dielectric substrate, a second dielectric substrate, and a third dielectric substrate;

[0021] The second dielectric substrate is located between the first dielectric substrate and the third dielectric substrate, the surface of the first dielectric substrate facing away from the second dielectric substrate is the first surface, and the surface of the third dielectric substrate facing away from the second dielectric substrate is the second surface.

[0022] Optionally, the magnetic dipole is used to radiate electromagnetic waves into space.

[0023] Optionally, the balun is a balanced-to-unbalanced converter used to convert the radiated signal into differential transmission, so that the radiated signal can be converted between balanced and unbalanced or impedance transformation can be achieved.

[0024] Optionally, the balun can be convex in shape; one end of the balun is a closed end and the other end is an open end; wherein the two connecting parts are located at the open end of the balun; the closed end of the balun is connected to the microstrip.

[0025] Optionally, the reflector is used to reflect electromagnetic waves radiated in the direction toward the reflector, so as to enhance the directivity of the Yagi antenna and reduce the interference of spatial noise on the Yagi antenna.

[0026] To address the aforementioned technical problems, another technical solution adopted in this embodiment of the invention is to provide a communication device. This communication device includes the aforementioned Yagi antenna.

[0027] Optionally, the communication device may be a radio receiver or a transmitter.

[0028] Optionally, a Yagi antenna typically consists of two parts: a main element and auxiliary elements. The main element is usually made of metal and is linear or planar, used to receive or transmit electromagnetic waves. The auxiliary elements are special metal strips that are installed around the main element and have a certain distance and angular relationship with it.

[0029] Optionally, the main element is the main working part of the Yagi antenna, which is generally divided into a driver and a reflector. The driver is usually composed of a thin metal strip and is used to receive or transmit electromagnetic waves. The reflector is usually composed of a metal strip that is slightly longer than the driver and is used to reflect the electromagnetic waves received or transmitted by the driver.

[0030] Optionally, auxiliary elements are used to form directional radiation patterns on both sides of the main element. They are typically composed of several metal strips, installed on one or both sides of the main element, and have a certain distance and angular relationship with the main element. The optimized design of parameters such as the number, length, distance, and angle of the auxiliary elements can enable the Yagi antenna to achieve higher gain and better directional characteristics.

[0031] Optionally, in order to transmit the electromagnetic waves received or transmitted by the Yagi antenna to the communication device, it is usually necessary to connect the Yagi antenna and the communication device via a cable; one end of the cable is connected to the Yagi antenna, and the other end is connected to the communication device.

[0032] Optionally, the magnetic dipole TE111 mode is an oscillation mode in the dielectric resonator and also a form of electromagnetic wave propagation; where TE indicates that there are only transverse magnetic waves and no longitudinal electric waves in the electromagnetic field; 111 indicates that the magnetic field oscillates in one direction on the cross-section of the dielectric resonator and oscillates for an integer multiple of the wavelength of the electric wave.

[0033] Optionally, the dielectric resonator is a device that generates resonance by utilizing the oscillation of electromagnetic waves inside a dielectric material; it is usually made of materials with high dielectric constants such as ceramics and quartz; the working principle of the dielectric resonator is based on the fact that the dielectric material has high dielectric constant, low conductivity, and also has dielectric polarity and dielectric polarization characteristics. When one end face is fully exposed in free space and the other end face is connected to the microwave guiding path through electrodes, a resonance phenomenon will occur between the two ends of the dielectric resonator.

[0034] Optionally, when external electromagnetic waves interact with the dielectric resonator, they gradually propagate along the electric and magnetic field distribution within the dielectric resonator. Since the dielectric constant of the dielectric material is higher than that of the external air or vacuum, the electric and magnetic field energy during propagation is accumulated and dissipated in large quantities within the dielectric resonator, ultimately forming a resonance effect.

[0035] Beneficial effects: The Yagi antenna proposed in this invention uses an isolation sheet and a dielectric resonator array composed of multiple dielectric resonators. Compared with the traditional Yagi antenna that uses multiple parasitic antennas, it can effectively reduce the overall size of the antenna while maintaining the same radiation performance, thus improving the miniaturization of the Yagi antenna. Attached Figure Description

[0036] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0037] Figure 1 is an exploded perspective view of the Yagi antenna provided in an embodiment of the present invention;

[0038] Figure 2 is a structural layout diagram of the Yagi antenna provided in an embodiment of the present invention. Detailed Implementation

[0039] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "away from," "away from," "closer to," "orienting," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Dielectric Resonator Antenna (DRA).

[0043] Figure 1 is an exploded perspective view of the Yagi antenna provided in an embodiment of the present invention. Referring to Figure 1, the Yagi antenna 100 includes: a substrate 10, an antenna body 20, and a plurality of dielectric resonators 30;

[0044] The substrate 10 has a first surface 11 and a second surface 12 facing each other; the antenna body 20 is disposed on the first surface 11 of the substrate 10 and includes a reflector 21 and a driver 22; the dielectric resonators 30 are arranged along the axial direction X of the substrate 10 to form a dielectric resonator array.

[0045] An isolation sheet 40 is provided between two adjacent dielectric resonators 30, and the dielectric resonator array is located on the first surface 11 of the substrate 10, adjacent to the driver 22.

[0046] Please refer to Figure 1. The oscillation mode of the dielectric resonator 30 is the magnetic dipole TE111 mode.

[0047] Please refer to Figure 1. The isolation sheet 40 is attached to the adjacent dielectric resonator 30 to form a magnetic wall between two adjacent dielectric resonators 30.

[0048] Please refer to Figure 1. The antenna body 20 also includes: signal post 23 and microstrip 24.

[0049] The signal post 23 is disposed at one end of the substrate 10 away from the dielectric resonator array; the microstrip 24 is disposed on the first surface 11 of the substrate 10 and connects the signal post 24 and the driver 22.

[0050] Please continue to refer to Figure 1. The signal post 23 extends through the substrate and has a first end 231 and a second end 232 that are far apart from each other.

[0051] The first end 231 is located on the first surface 11 and is connected to the microstrip 24; the second end 232 is located on the second surface 12.

[0052] Please refer to Figure 1. The main body of the antenna 20 also includes: a balun 25;

[0053] The balun 25 is disposed on the first surface 11 of the substrate 10, located between the microstrip 24 and the driver 22.

[0054] Please refer to Figure 1. The driver 22 is composed of a strip-shaped first metal strip 221 and a second metal strip 222. The first metal strip 221 and the second metal strip 222 are arranged side by side on the first surface 11 of the substrate 10 and are respectively connected to the two connecting parts of the balun 25.

[0055] Figure 2 is a structural arrangement diagram of the Yagi antenna provided in an embodiment of the present invention. Referring to Figures 1 and 2, the reflector 21 is composed of a strip-shaped third metal strip 211 and a fourth metal strip 212; the third metal strip 211 and the fourth metal strip 212 are arranged side by side on the first surface 11 of the substrate 10, located between the driver 22 and the balun 25;

[0056] The reflector 21 and the driver 22 are separated by a first preset distance 213; the dielectric resonator array and the driver 22 are separated by a second preset distance 223.

[0057] In some embodiments, please refer to FIG1 and FIG2, the substrate 10 includes: a first dielectric substrate 13, a second dielectric substrate 14 and a third dielectric substrate 15;

[0058] The second dielectric plate 14 is located between the first dielectric plate 13 and the third dielectric plate 15. The surface of the first dielectric plate 13 facing away from the second dielectric plate 14 is the first surface 11, and the surface of the third dielectric plate 15 facing away from the second dielectric plate 14 is the second surface 12.

[0059] Specifically, the insulating sheet 40 is made of a material with a high dielectric constant, and the thickness 41 of the insulating sheet 40 should be less than 0.15λ, where λ is the wavelength of the signal radiated by the Yagi antenna 100.

[0060] Specifically, the magnetic wall formed by the insulating sheet 40 is used to transfer energy and to prevent coupling between the various dielectric resonators 30. The magnetic dipole is used to radiate electromagnetic waves into space.

[0061] Specifically, the balun 25 can be convex in shape; one end of the balun 25 is a closed end 251, and the other end is an open end 252; wherein, the two connecting parts are located at the open end 252 of the balun 25; the closed end 251 of the balun 25 is connected to the microstrip 24.

[0062] Specifically, the balun 25 is a balanced-to-unbalanced converter used to convert the radiated signal into differential transmission, so that the radiated signal can be converted between balanced and unbalanced or impedance transformation can be achieved.

[0063] Specifically, the reflector 21 is used to reflect electromagnetic waves radiated in the direction toward the reflector 21, so as to enhance the directivity of the Yagi antenna 100 and reduce the interference of spatial noise on the Yagi antenna 100.

[0064] The present invention also provides an embodiment of a communication device, which includes the aforementioned Yagi antenna 100. The structure and function of the Yagi antenna 100 can be found in the above embodiments and will not be repeated here. The communication device may be a radio receiver or a transmitter.

[0065] Generally speaking, a Yagi antenna usually consists of two parts: a main element and auxiliary elements. The main element is usually made of metal and is linear or planar, used to receive or transmit electromagnetic waves. The auxiliary elements are special metal strips that are installed around the main element and have a certain distance and angular relationship with it.

[0066] Generally, the main element is the primary working part of a Yagi antenna, and it is usually divided into a driver and a reflector. The driver is usually composed of a thin metal strip and is used to receive or transmit electromagnetic waves. The reflector is usually composed of a metal strip that is slightly longer than the driver and is used to reflect the electromagnetic waves received or transmitted by the driver.

[0067] Generally, auxiliary elements are used to form directional radiation patterns on both sides of the main element. They usually consist of several metal strips, installed on one or both sides of the main element, and have a certain distance and angular relationship with the main element. The optimized design of parameters such as the number, length, distance and angle of the auxiliary elements can enable the Yagi antenna to achieve higher gain and better directivity characteristics.

[0068] Generally, in order to transmit the electromagnetic waves received or emitted by the Yagi antenna to the communication device, it is usually necessary to connect the Yagi antenna and the communication device through a cable; one end of the cable is connected to the Yagi antenna, and the other end is connected to the communication device.

[0069] Specifically, the magnetic dipole TE111 mode is an oscillation mode in the dielectric resonator 30 and also a form of electromagnetic wave propagation; where TE indicates that there are only transverse magnetic waves and no longitudinal electric waves in the electromagnetic field; 111 indicates that the magnetic field oscillates in one direction on the cross-section of the dielectric resonator 30 and oscillates for an integer multiple of the wavelength of the electric wave.

[0070] Specifically, a dielectric resonator 30 is a device that generates resonance by utilizing the oscillation of electromagnetic waves inside a dielectric material; it is usually made of materials with high dielectric constants such as ceramics and quartz; the working principle of the dielectric resonator 30 is based on the fact that the dielectric material has high dielectric constant, low conductivity, and also has dielectric polarity and dielectric polarization characteristics. When one end face is fully exposed in free space and the other end face is connected to the microwave guiding path through electrodes, a resonance phenomenon will occur between the two ends of the dielectric resonator 30.

[0071] Specifically, when external electromagnetic waves interact with the dielectric resonator 30, they gradually propagate along the electric and magnetic field distribution within the dielectric resonator 30. Since the dielectric constant of the dielectric material is higher than that of the outside air or vacuum, the electric and magnetic field energy during propagation is accumulated and dissipated in large quantities within the dielectric resonator 30, ultimately forming a resonance effect.

[0072] In summary, the Yagi antenna and communication device provided by the embodiments of the present invention, by incorporating multiple dielectric resonators with TE111 oscillation modes and an isolation sheet, adopts a dielectric resonator array composed of an isolation sheet and multiple dielectric resonators, thereby reducing the spacing between each dielectric resonator. This effectively reduces the overall size of the antenna while ensuring that the radiation performance remains unchanged, and improves the miniaturization of the Yagi antenna.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Yagi antenna, characterized in that, include: substrate; The substrate has opposing first and second surfaces; Antenna body; The antenna body is disposed on the first surface of the substrate and includes a reflector and a driver; Multiple dielectric resonators; The plurality of dielectric resonators are arranged along the axial direction of the substrate to form a dielectric resonator array; The dielectric resonator array is located on the first surface of the substrate, adjacent to the driver; the antenna body further includes a signal post and a microstrip; the signal post is disposed at the end of the substrate away from the dielectric resonator array; the microstrip is disposed on the first surface of the substrate and connects the signal post and the driver. The reflector and the driver have a first preset distance, and the dielectric resonator array and the driver have a second preset distance; the oscillation mode of the dielectric resonator is the magnetic dipole TE111 mode; an isolation sheet is provided between two adjacent dielectric resonators; wherein the isolation sheet is in close contact with the adjacent dielectric resonator to form a magnetic wall between two adjacent dielectric resonators.

2. The Yagi antenna according to claim 1, characterized in that, The signal post extends through the substrate and has a first end and a second end that are far apart from each other; wherein the first end is located on the first surface and is connected to the microstrip; and the second end is located on the second surface.

3. The Yagi antenna according to claim 1, characterized in that, The antenna body also includes a balun, which is disposed on the first surface of the substrate and located between the microstrip and the driver.

4. The Yagi antenna according to claim 3, characterized in that, The driver consists of a first metal strip and a second metal strip; the first metal strip and the second metal strip are arranged side by side on the first surface of the substrate and are respectively connected to the two connecting parts of the balun.

5. The Yagi antenna according to claim 4, characterized in that, The reflector is composed of a third metal strip and a fourth metal strip; the third metal strip and the fourth metal strip are arranged side by side on the first surface of the substrate, located between the driver and the balun.

6. A communication device, characterized in that, include: The Yagi antenna as described in any one of claims 1-5.

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