WO2021082807A1

WO2021082807A1 - Antenna

Info

Publication number: WO2021082807A1
Application number: PCT/CN2020/116582
Authority: WO
Inventors: 谭杰洪
Original assignee: 深圳市道通智能航空技术股份有限公司
Priority date: 2019-10-31
Filing date: 2020-09-21
Publication date: 2021-05-06
Also published as: CN110828990A

Abstract

The present invention discloses an antenna, which comprises a first radiation portion, a second radiation portion, and a coaxial line, wherein the coaxial line comprises an inner wire and an outer wire insulated and isolated from the inner wire; the first radiation portion comprises a feed arm and a first radiation arm connected with the feed arm, the feed arm is provided with a feed point, and the inner wire is electrically connected with the feed arm through the feed point; the second radiation portion comprises a ground arm, a second radiation arm and a third radiation arm, wherein the ground arm and the feed arm are arranged at intervals, the second radiation arm and the third radiation arm are respectively connected with the two ends of the ground arm and extend towards one side away from the feed arm; the ground arm is provided with a ground point, and the outer wire is electrically connected with the ground arm through the ground point. The invention makes the antenna less affected by the feed cable, realizes the required standing wave bandwidth within the limited length of the antenna, reduces the size of the antenna, and has a simple structure.

Description

An antenna

Technical field

The present invention relates to the field of communication, in particular to an antenna.

Background technique

With the rapid development of wireless communication and the requirements of various data services, antenna design is mainly moving towards miniaturization, multi-frequency and broadband development. Miniaturization requires antennas to reduce their size to adapt to the continuous increase in the integration of communication equipment and the increasing volume. The smaller the development trend. The size of the existing microstrip antennas is relatively long. When the length of the antenna is limited, the use of the antenna is affected to a certain extent, and the two microstrip antennas of the antenna are fed simultaneously on the front and back of the substrate with two feeding coaxial lines. , Which makes the feed structure of the antenna complicated, and the feed network needs at least two ports to be connected to the antenna in the application.

Summary of the invention

In order to overcome the problems of large size and complex structure of existing antennas, the purpose of the present invention is to provide an antenna.

In order to achieve the above objective, the present invention provides an antenna including a first radiating part, a second radiating part, and a coaxial line, the coaxial line including an inner wire and an outer wire insulated from the inner wire;

The first radiating part includes a feeding arm and a first radiating arm connected to the feeding arm, the feeding arm is provided with a feeding point, and the inner wire passes through the feeding point and the feeding point. Electric arm electrical connection;

The second radiating part includes a ground arm, a second radiating arm, and a third radiating arm. The ground arm and the feeding arm are spaced apart, and the second radiating arm and the third radiating arm are respectively connected to the Both ends of the ground arm are connected and extend toward the side away from the feed arm; the ground arm is provided with a ground point, and the outer wire is electrically connected to the ground arm through the ground point.

Preferably, the first radiating arm includes a first vibrator arm, a second vibrator arm, and a device that is arranged between the first vibrator arm and the second vibrator arm and is away from the feed arm away from the ground arm. An impedance transformation feeder belt connected at one end, a multi-section bent microstrip line connected to the impedance transformation feeder belt, and a first connecting arm connected to the microstrip line; the first vibrator arm and the first The two vibrator arms are respectively connected to the two ends of the feeding arm and both extend toward the side away from the ground arm.

Preferably, the first dipole arm and the second dipole arm are arranged symmetrically with respect to the central axis of the antenna, and the central axis of the antenna is a straight line between the midpoint of the feed arm and the midpoint of the ground arm. .

Preferably, the first radiating arm further includes a first reverse loading line and a second reverse loading line, the first reverse loading line and the second reverse loading line are respectively connected to the first connecting arm The two ends of the are connected and both extend toward one side of the feed arm, the end of the first reverse loading line and the end of the first vibrator arm are spaced apart, and the second reverse loading line The end is spaced apart from the end of the second vibrator arm.

Preferably, the first reverse loading line and the second reverse loading line are symmetrically arranged with respect to the central axis of the antenna, and the central axis of the antenna is the midpoint of the feed arm and the midpoint of the ground arm. The line where the point lies.

Preferably, the impedance conversion feed strip is rectangular, trapezoidal or elliptical.

Preferably, the second radiating arm includes a third vibrator arm, a fourth vibrator arm, and a fifth vibrator arm, and the third vibrator arm and the fourth vibrator arm are spaced apart and both face away from the feeder. One side of the arm extends, one end of the third vibrator arm and the fourth vibrator arm are both connected to the ground arm, and the fifth vibrator arm is bent from the other end of the third vibrator arm. Extending toward one side of the ground arm, one end of the fifth vibrator arm and the other end of the fourth vibrator arm are spaced apart.

Preferably, the third radiating arm includes a sixth dipole arm, a seventh dipole arm, and an eighth dipole arm, and the sixth dipole arm and the seventh dipole arm are spaced apart and both face away from the feed arm. Extending on one side, one end of the sixth vibrator arm and the seventh vibrator arm are both connected to the ground arm, and the eighth vibrator arm is bent from the other end of the sixth vibrator arm and faces the ground One side of the arm extends, and one end of the eighth vibrator arm and the other end of the seventh vibrator arm are spaced apart.

Preferably, the second radiating arm and the third radiating arm are symmetrically arranged with respect to the central axis of the antenna, and the central axis of the antenna is a straight line between the midpoint of the feed arm and the midpoint of the ground arm. .

Preferably, the antenna further includes a substrate, and the first radiating portion and the second radiating portion are both provided on the substrate.

Preferably, the first radiating part and the second radiating part are arranged on the same side of the substrate.

Preferably, the coaxial line is provided between the second radiating arm and the third radiating arm.

Preferably, the substrate is a PCB board, a metal board or an FPC board.

Preferably, the radiation frequency band of the antenna includes 900MHz～940MHz and 2.35GHz～2.55GHz.

Compared with the prior art, the present invention has the beneficial effect of providing a feed point connected to the inner conductor of the coaxial line on the first radiating part, and providing a feed point connected to the outer conductor of the coaxial line on the second radiating part. Grounding point, the second radiating part includes a second radiating arm and a third radiating arm respectively connected to both ends of the grounding arm and extending toward the side away from the feeding arm, so that the second radiating arm and the third radiating arm are An air-permeable structure is formed between the antennas, so that the antenna is less affected by the feed cable, the required standing wave bandwidth is achieved within the limited length of the antenna, the antenna size is reduced, and the structure is simple.

Description of the drawings

FIG. 1 is a schematic diagram of an antenna provided by an embodiment of the present invention;

2 is a schematic diagram of assembly of the first radiating part and the second radiating part of the antenna provided by the first embodiment of the present invention;

3 is a schematic diagram of assembly of the first radiating part and the second radiating part of the antenna provided by the second embodiment of the present invention;

4 is a schematic diagram of assembling the first radiating part and the second radiating part of the antenna provided by the third embodiment of the present invention;

FIG. 5 is a diagram of S parameters of an antenna provided by an embodiment of the present invention;

Fig. 6 is a 900 MHz directivity diagram of an antenna provided by an embodiment of the present invention;

FIG. 7 is a directional diagram of an antenna provided by an embodiment of the present invention at 2.45 GHz;

In the figure: 10, antenna; 1. first radiating part; 11, feeding arm; 12, first radiating arm; 121, first dipole arm; 122, second dipole arm; 123, impedance transformation feeder belt; 124 , Microstrip line; 1241, U-shaped bending part; 125, first connecting arm; 126, first reverse loading line; 127, second reverse loading line; 13, feeding point; 2. second radiating part 21, ground arm; 22, second radiating arm; 221, third vibrator arm; 222, fourth vibrator arm; 223, fifth vibrator arm; 2231, first extension arm; 2232, second extension arm; 23 , The third radiating arm; 231, the sixth vibrator arm; 232, the seventh vibrator arm; 233, the eighth vibrator arm; 2331, the third extension arm; 2332, the fourth extension arm; 24, ground point; 3. coaxial Wire; 31, inner wire; 32, outer wire; 4. substrate.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as being "fixed to" another element, it may be directly on the other element, or there may be one or more elements in between. When an element is said to be "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements in between. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention in this specification are only for the purpose of describing specific embodiments, and are not used to limit the present invention. The term "and/or" used in this specification includes any and all combinations of one or more related listed items.

In the following, the present invention will be further described with reference to the drawings and specific implementations. It should be noted that, provided that there is no conflict, the following embodiments or technical features can be combined to form new embodiments. .

As shown in FIG. 1, the antenna 10 provided by the embodiment of the present invention includes a first radiating portion 1, a second radiating portion 2, and a coaxial line 3. The coaxial line 3 includes an inner wire 31 and an outer wire insulated from the inner wire 31. Wire 32; the first radiating portion 1 includes a feeding arm 11 and a first radiating arm 12 connected to the feeding arm 11. A feeding point 13 is provided on the feeding arm 11, and the inner wire 31 passes through the feeding point 13 and the feeding The arm 11 is electrically connected to feed the first radiating arm 12; the second radiating portion 2 includes a ground arm 21, a second radiating arm 22, and a third radiating arm 23. The ground arm 21 is spaced from the feeding arm 11, and the ground arm 21 There is a grounding point 24, and the outer wire 32 is electrically connected to the grounding arm 21 through the grounding point 24; the second radiating arm 22 and the third radiating arm 23 are respectively connected to both ends of the grounding arm 21 and both face away from the feeding arm 11 Extend on one side to form a transparent structure between the second radiating arm 22 and the third radiating arm 23, so that the antenna 10 is less affected by the feed cable, achieving the required standing wave bandwidth within the limited length of the antenna 10, and reducing the antenna The size is simple and the structure is simple.

As shown in FIG. 2, in the antenna provided by the first embodiment of the present invention, the first radiating arm 12 includes a first dipole arm 121, a second dipole arm 122, and is arranged between the first dipole arm 121 and the second dipole arm 122. The impedance conversion feeder belt 123 connected to the end of the feeder arm 11 away from the ground arm 21, the multi-section bent microstrip line 124 connected to the impedance conversion feeder belt 123, and the first connecting arm 125 connected to the microstrip line 124 ; The first vibrator arm 121 and the second vibrator arm 122 are respectively connected to both ends of the feeding arm 11 and both extend toward the side away from the ground arm 21. The shape of the impedance conversion feeding strip 123 is rectangular, and the cross-sectional width of the impedance conversion feeding strip 123 is larger than the width of the microstrip line 124. The microstrip line 124 includes four U-shaped bending portions 1241 arranged periodically.

In one embodiment, the feed point 13 is set at the midpoint of the feed arm 11, the ground point 24 is set at the midpoint of the ground arm 21, and the first dipole arm 121 and the second dipole arm 122 are relative to the central axis of the antenna ( (Not shown in the figure) symmetrically arranged, the central axis of the antenna is a straight line between the midpoint of the feed arm 11 and the midpoint of the ground arm 21.

As shown in FIG. 3, the antenna provided by the second embodiment of the present invention differs from the first embodiment in that the first radiating arm 12 also includes a first reverse loading line 126 and a second reverse loading line 127. A reverse loading line 126 and a second reverse loading line 127 are respectively connected to both ends of the first connecting arm 125 and both extend toward one side of the feeding arm 11. The first reverse loading line 126 and the first vibrator arm 121 Being on the same straight line, the second reverse loading line 127 and the second vibrator arm 122 are on the same straight line. The end of the first reverse loading line 126 and the end of the first vibrator arm 121 are spaced apart, and the end of the second reverse loading line 127 and the end of the second vibrator arm 122 are spaced apart.

In one embodiment, the first reverse loading line 126 and the second reverse loading line 127 are symmetrically arranged with respect to the central axis of the antenna, and the central axis of the antenna 10 is the midpoint of the feed arm 11 and the midpoint of the ground arm 21 The straight line.

In one embodiment, the first dipole arm 121 and the second dipole arm 122 are high-frequency radiation arms, and the length of the first dipole arm 121 and the second dipole arm 122 is 1/8 to 3/4 of the high-frequency resonance wavelength. . The impedance transformation feeder belt 123, the microstrip line 124, the first reverse load line 126 and the second reverse load line 127 are low-frequency radiation arms, the impedance transformation feeder belt 123, the microstrip line 124, the first reverse load line The total length of 126 and the second reverse loading line 127 is 1/8 to 3/4 of the low-frequency resonance wavelength. The low-frequency radiation frequency band of the antenna 10 is 900 MHz˜940 MHz, and the high-frequency radiation frequency band of the antenna 10 is 2.35 GHz˜2.55 GHz.

As shown in FIG. 4, the antenna provided by the third embodiment of the present invention differs from the second embodiment in that the impedance conversion feed band 123 is trapezoidal. It should be noted that, in other embodiments, the impedance conversion feed strip 123 may also be elliptical.

As shown in FIGS. 2-4, the second radiating arm 22 includes a third dipole arm 221, a fourth dipole arm 222, and a fifth dipole arm 223. The third dipole arm 221 and the fourth dipole arm 222 are spaced apart and all face Extending on the side away from the feeding arm 11, one end of the third vibrator arm 221 and the fourth vibrator arm 222 are both connected to the ground arm 21, and the fifth vibrator arm 223 is bent from the other end of the third vibrator arm 221 and faces One side of the ground arm 21 extends, and one end of the fifth vibrator arm 223 and the other end of the fourth vibrator arm 222 are spaced apart. The fifth pendulum arm 223 includes a first extension arm 2231 and a second extension arm 2232. The first extension arm 2231 is connected between the second extension arm 2232 and the third pendulum arm 221, and the second extension arm 2232 faces the ground arm 21. Extending on one side, the fourth vibrator arm 222 and the second extension arm 2232 are on the same straight line.

The third radiating arm 23 includes a sixth dipole arm 231, a seventh dipole arm 232, and an eighth dipole arm 233. The sixth dipole arm 231 and the seventh dipole arm 232 are spaced apart and extend toward the side away from the feed arm 11, One ends of the sixth vibrator arm 231 and the seventh vibrator arm 232 are both connected to the ground arm 21, and the eighth vibrator arm 233 is bent from the other end of the sixth vibrator arm 231 and extends toward one side of the ground arm 21. One end of 233 and the other end of the seventh vibrator arm 232 are spaced apart. The eighth pendulum arm 233 includes a third extension arm 2331 and a fourth extension arm 2332. The third extension arm 2331 is connected between the fourth extension arm 2332 and the sixth pendulum arm 231, and the fourth extension arm 2332 faces one side of the ground arm 21. Side extension, the seventh vibrator arm 232 and the fourth extension arm 2332 are on the same straight line.

In one embodiment, the second radiating arm 22 and the third radiating arm 23 are symmetrically arranged with respect to the central axis of the antenna 10, and the central axis of the antenna 10 is a straight line between the midpoint of the feed arm 11 and the midpoint of the ground arm 21. . The fourth oscillator arm 222 and the seventh oscillator arm 232 are high frequency oscillator arms, and the length of the fourth oscillator arm 222 and the seventh oscillator arm 232 is 1/8 to 3/4 of the high frequency resonance wavelength. The third oscillator arm 221, the second extension arm 2232, the sixth oscillator arm 231, and the fourth extension arm 2332 are low-frequency radiation arms. The total length of the third oscillator arm 221 and the second extension arm 2232 is 1 of the low-frequency resonance wavelength. /8 to 3/4; the total length of the sixth vibrator arm 231 and the fourth extension arm 2332 is 1/8 to 3/4 of the low-frequency resonance wavelength.

As shown in FIG. 1, the antenna further includes a substrate 4, the first radiating part 1 and the second radiating part 2 are both provided on the substrate 4, and the substrate 4 is a PCB board, a metal board or an FPC board. Preferably, the first radiating part 1 and the second radiating part 2 are arranged on the same side of the substrate 4, and the coaxial line 3 is arranged between the second radiating arm 22 and the third radiating arm 23.

Fig. 5 is a diagram of S parameters of the antenna provided by an embodiment of the present invention. It can be seen from the diagram that the antenna 10 can work at 900MHz～940MHz and 2.35GHz～2.55GHz, with bandwidths of 40MHz (4.3%) and 200MHz (8.0%), respectively. Coverage of commonly used 900MHz and 2.45GHz frequency bands.

Figure 6 is a 900MHz pattern of the antenna provided by an embodiment of the present invention. Figure 7 is a pattern of the antenna provided by an embodiment of the present invention at 2.45GHz. It can be seen from the figure that the antenna 10 can achieve omnidirectional coverage at both 900MHz and 2.45GHz. And the maximum antenna radiation direction is in the horizontal direction.

In the antenna 10 provided by the embodiment of the present invention, the first radiating portion 1 of the antenna 10 is provided with a feeding point 13 connected to the inner wire 31 of the coaxial line 3, and the second radiating portion 2 is provided with the coaxial line 3. The second radiating portion 2 includes a second radiating arm 22 and a third radiating arm 23 which are respectively connected to the two ends of the ground arm 21 and extend toward the side away from the feed arm 11, Thus, a transparent structure is formed between the second radiating arm 22 and the third radiating arm 23, so that the antenna is less affected by the feed cable. Since the low-frequency part of the antenna adopts a continuously bent structure, the size of the antenna is reduced and the structure is simple. The different effective radiation parts of the antenna are used for different frequency bands so that it can work in dual frequency, and effectively ensure the omnidirectional radiation of the pattern in the two frequency bands, and the maximum inclination angle is in the horizontal direction. The antenna adopts the asymmetric structure of the upper and lower arms so that the antenna has a larger standing wave bandwidth, so that the required standing wave bandwidth can be achieved within the limited length of the antenna.

The foregoing embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the present invention. Scope of protection

Claims

An antenna, characterized by comprising a first radiating part, a second radiating part and a coaxial line, the coaxial line comprising an inner wire and an outer wire insulated from the inner wire;

The first radiating part includes a feeding arm and a first radiating arm connected to the feeding arm, the feeding arm is provided with a feeding point, and the inner wire passes through the feeding point and the feeding point. Electric arm electrical connection;

The second radiating part includes a ground arm, a second radiating arm, and a third radiating arm. The ground arm and the feeding arm are spaced apart, and the second radiating arm and the third radiating arm are respectively connected to the Both ends of the ground arm are connected and extend toward the side away from the feed arm; the ground arm is provided with a ground point, and the outer wire is electrically connected to the ground arm through the ground point.
The antenna according to claim 1, wherein the first radiating arm includes a first dipole arm, a second dipole arm, and is arranged between the first dipole arm and the second dipole arm and is connected to the first dipole arm and the second dipole arm. An impedance transformation feeding strip connected to an end of the feeding arm away from the ground arm, a plurality of bent microstrip lines connected to the impedance transformation feeding strip, and a first connecting arm connected to the microstrip line; The first vibrator arm and the second vibrator arm are respectively connected to two ends of the feed arm and both extend toward a side away from the ground arm.
The antenna according to claim 2, wherein the first dipole arm and the second dipole arm are arranged symmetrically with respect to the central axis of the antenna, and the central axis of the antenna is the midpoint and the central axis of the feed arm. The straight line where the midpoint of the ground arm is located.
The antenna according to claim 2, wherein the first radiating arm further comprises a first reverse loading line and a second reverse loading line, the first reverse loading line and the second reverse loading line Loading lines are respectively connected to both ends of the first connecting arm and both extend toward one side of the feeding arm, and the end of the first reverse loading line and the end of the first vibrator arm are spaced apart , The end of the second reverse loading line and the end of the second vibrator arm are arranged at intervals.
The antenna according to claim 4, wherein the first reverse loading line and the second reverse loading line are symmetrically arranged with respect to the central axis of the antenna, and the central axis of the antenna is the feed arm The line between the midpoint of the ground arm and the midpoint of the ground arm.
The antenna according to claim 2, wherein the impedance conversion feed strip is rectangular, trapezoidal or elliptical.
The antenna according to claim 1, wherein the second radiating arm comprises a third dipole arm, a fourth dipole arm, and a fifth dipole arm, and the third dipole arm and the fourth dipole arm Are arranged at intervals and both extend toward the side away from the feed arm, one end of the third vibrator arm and the fourth vibrator arm are both connected to the ground arm, and the fifth vibrator arm extends from the first The other end of the three vibrator arm is bent and extends toward one side of the ground arm, and one end of the fifth vibrator arm and the other end of the fourth vibrator arm are spaced apart.
The antenna according to claim 7, wherein the third radiating arm includes a sixth dipole arm, a seventh dipole arm, and an eighth dipole arm, and the sixth dipole arm and the seventh dipole arm are spaced apart And both extend toward the side away from the feed arm, one ends of the sixth vibrator arm and the seventh vibrator arm are both connected to the ground arm, and the eighth vibrator arm extends from the sixth vibrator arm The other end is bent and extends toward one side of the ground arm, and one end of the eighth vibrator arm and the other end of the seventh vibrator arm are spaced apart.
The antenna according to claim 8, wherein the second radiating arm and the third radiating arm are symmetrically arranged with respect to the central axis of the antenna, and the central axis of the antenna is the midpoint and the central axis of the feed arm. The straight line where the midpoint of the ground arm is located.
The antenna according to claim 1, wherein the antenna further comprises a substrate, and the first radiating portion and the second radiating portion are both provided on the substrate.
The antenna according to claim 10, wherein the first radiating portion and the second radiating portion are provided on the same side of the substrate.
The antenna according to claim 11, wherein the coaxial line is provided between the second radiating arm and the third radiating arm.
The antenna according to claim 10, wherein the substrate is a PCB board, a metal board or an FPC board.
The antenna according to claim 1, wherein the radiation frequency bands of the antenna include 900MHz～940MHz and 2.35GHz～2.55GHz.