CN211208664U

CN211208664U - Antenna

Info

Publication number: CN211208664U
Application number: CN201921858459.XU
Authority: CN
Inventors: 谭杰洪
Original assignee: Autel Robotics Co Ltd
Current assignee: Shenzhen Autel Intelligent Aviation Technology Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-08-07
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses an antenna, which comprises a first radiation part, a second radiation part and a coaxial line, wherein the coaxial line comprises an inner conductor and an outer conductor insulated and isolated from the inner conductor; the first radiation part comprises a feed arm and a first radiation arm connected with the feed arm, a feed point is arranged on the feed arm, and the inner lead is electrically connected with the feed arm through the feed point; the second radiation part comprises a grounding arm, a second radiation arm and a third radiation arm, the grounding arm and the feed arm are arranged at intervals, and the second radiation arm and the third radiation arm are respectively connected with two ends of the grounding arm and extend towards one side far away from the feed arm; the grounding arm is provided with a grounding point, and the outer lead is electrically connected with the grounding arm through the grounding point. The utility model discloses it is little for the antenna receives the feeder cable influence, realizes reaching demand standing wave bandwidth in the limited length of antenna, reduces antenna size, simple structure.

Description

Antenna

Technical Field

The utility model relates to the field of communications, especially, relate to an antenna.

Background

With the rapid development of wireless communication and the demand of various data services, the antenna design mainly develops towards miniaturization, multiple frequency bands and wide frequency bands, and the miniaturization requires the antenna to reduce the size of the antenna so as to adapt to the development trend that the integration level of communication equipment is continuously improved and the size of the communication equipment is smaller and smaller. The existing microstrip antenna has a long size, the antenna is influenced to a certain extent when the antenna is limited in length, and two microstrip antennas of the antenna are simultaneously fed on the front and back surfaces of a substrate by two feeding coaxial lines respectively, so that the feeding structure of the antenna is complex, and a feeding network needs at least two ports to be connected with the antenna in application.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that the size of the existing antenna is large and the structure is complex, the utility model aims to provide an antenna.

In order to achieve the above object, the present invention provides an antenna, including a first radiation portion, a second radiation portion and a coaxial line, wherein the coaxial line includes an inner conductor and an outer conductor insulated and isolated from the inner conductor;

the first radiation part comprises a feed arm and a first radiation arm connected with the feed arm, a feed point is arranged on the feed arm, and the inner lead is electrically connected with the feed arm through the feed point;

the second radiation part comprises a grounding arm, a second radiation arm and a third radiation arm, the grounding arm and the feed arm are arranged at intervals, and the second radiation arm and the third radiation arm are respectively connected with two ends of the grounding arm and extend towards one side far away from the feed arm; the grounding arm is provided with a grounding point, and the outer lead is electrically connected with the grounding arm through the grounding point.

Preferably, the first radiating arm includes a first oscillator arm, a second oscillator arm, an impedance transformation feed strip disposed between the first oscillator arm and the second oscillator arm and connected to one end of the feed arm away from the ground arm, a multi-section bent microstrip line connected to the impedance transformation feed strip, and a first connecting arm connected to the microstrip line; the first oscillator arm and the second oscillator arm are respectively connected with two ends of the feed arm and extend towards one side far away from the grounding arm.

Preferably, the first dipole arm and the second dipole arm are symmetrically arranged about a central axis of the antenna, and the central axis of the antenna is a straight line where a midpoint of the feed arm and a midpoint of the ground arm are located.

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 two ends of the first connecting arm and both extend toward one side of the feeding arm, an end of the first reverse loading line and an end of the first dipole arm are arranged at an interval, and an end of the second reverse loading line and an end of the second dipole arm are arranged at an interval.

Preferably, the first reverse loading line and the second reverse loading line are symmetrically arranged about a central axis of the antenna, and the central axis of the antenna is a straight line where a midpoint of the feed arm and a midpoint of the ground arm are located.

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

Preferably, the second radiation arm includes third oscillator arm, fourth oscillator arm and fifth oscillator arm, the third oscillator arm with fourth oscillator arm interval sets up and all towards keeping away from one side of feed arm extends, the third oscillator arm with the one end of fourth oscillator arm all with the ground connection arm is connected, the fifth oscillator arm is followed the other end of third oscillator arm is buckled and is faced one side of ground connection arm extends, the one end of fifth oscillator arm with the other end interval of fourth oscillator arm sets up.

Preferably, the third radiating arm includes a sixth oscillator arm, a seventh oscillator arm and an eighth oscillator arm, the sixth oscillator arm and the seventh oscillator arm are disposed at an interval and extend towards one side far away from the feed arm, the sixth oscillator arm and one end of the seventh oscillator arm are connected to the ground arm, the eighth oscillator arm is bent from the other end of the sixth oscillator arm and extends towards one side of the ground arm, and one end of the eighth oscillator arm and the other end of the seventh oscillator arm are disposed at an interval.

Preferably, the second radiation arm and the third radiation arm are symmetrically arranged about a central axis of the antenna, and the central axis of the antenna is a straight line where a midpoint of the feed arm and a midpoint of the ground arm are located.

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

Preferably, the first radiation portion and the second radiation portion are disposed on the same side of the substrate.

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

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

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

Compared with the prior art, the beneficial effects of the utility model reside in that: through set up the feed point of being connected with the inner conductor of coaxial line on first radiation portion, set up the ground point of being connected with the outer conductor of coaxial line on the second radiation portion, the second radiation portion includes second radiation arm and the third radiation arm that is connected with the both ends of ground arm respectively and all extends towards the one side of keeping away from the feed arm, thereby form the permeable structure between second radiation arm and third radiation arm, it is little that the antenna receives the feeder cable influence, reach demand standing wave bandwidth in realizing the antenna finite length, reduce the antenna size, and simple structure.

Drawings

Fig. 1 is a schematic diagram of an antenna provided in an embodiment of the present invention;

fig. 2 is an assembly diagram of a first radiation portion and a second radiation portion of an antenna according to a first embodiment of the present invention;

fig. 3 is an assembly diagram of a first radiation portion and a second radiation portion of an antenna according to a second embodiment of the present invention;

fig. 4 is an assembly diagram of a first radiation portion and a second radiation portion of an antenna according to a third embodiment of the present invention;

fig. 5 is an S parameter diagram of an antenna provided by an embodiment of the present invention;

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

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

in the figure: 10. an antenna; 1. a first radiation section; 11. a feed arm; 12. a first radiating arm; 121. a first vibrator arm; 122. a second vibrator arm; 123. an impedance transformation feed strip; 124. a microstrip line; 1241. a U-shaped bending part; 125. a first connecting arm; 126. a first reverse loading line; 127. a second reverse loading line; 13. a feed point; 2. a second radiation section; 21. a grounding arm; 22. a second radiating arm; 221. a third vibrator arm; 222. a fourth vibrator arm; 223. a fifth vibrator arm; 2231. a first extension arm; 2232. a second extension arm; 23. a third radiating arm; 231. a sixth vibrator arm; 232. a seventh vibrator arm; 233. an eighth vibrator arm; 2331. a third extension arm; 2332. a fourth extension arm; 24. a ground point; 3. a coaxial line; 31. an inner lead; 32. an outer lead; 4. a substrate.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

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

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1, an antenna 10 provided in the embodiment of the present invention includes a first radiation portion 1, a second radiation portion 2, and a coaxial line 3, where the coaxial line 3 includes an inner conductive line 31 and an outer conductive line 32 insulated and isolated from the inner conductive line 31; the first radiation part 1 comprises a feed arm 11 and a first radiation arm 12 connected with the feed arm 11, a feed point 13 is arranged on the feed arm 11, and an inner lead 31 is electrically connected with the feed arm 11 through the feed point 13 and feeds power to the first radiation arm 12; the second radiation part 2 comprises a grounding arm 21, a second radiation arm 22 and a third radiation arm 23, the grounding arm 21 and the feed arm 11 are arranged at intervals, a grounding point 24 is arranged on the grounding arm 21, and an external lead 32 is electrically connected with the grounding arm 21 through the grounding point 24; the second radiation arm 22 and the third radiation arm 23 are respectively connected with two ends of the grounding arm 21 and extend towards one side far away from the feed arm 11, so that a hollow structure is formed between the second radiation arm 22 and the third radiation arm 23, the antenna 10 is slightly influenced by a feed cable, the required standing wave bandwidth is achieved in the limited length of the antenna 10, the size of the antenna is reduced, 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 oscillator arm 121, a second oscillator arm 122, an impedance transforming feed strip 123 disposed between the first oscillator arm 121 and the second oscillator arm 122 and connected to one end of the feed arm 11 away from the ground arm 21, a multi-section bent microstrip line 124 connected to the impedance transforming feed strip 123, and a first connecting arm 125 connected to the microstrip line 124; the first and

second vibrator arms

121 and 122 are connected to both ends of the feed arm 11, respectively, and both extend toward a side away from the ground arm 21. The impedance transformation feed strip 123 is rectangular, the cross-sectional width of the impedance transformation feed strip 123 is greater than the width of the microstrip line 124, and the microstrip line 124 includes four U-shaped bending portions 1241 arranged periodically.

In one embodiment, the feeding point 13 is disposed at a midpoint of the feeding arm 11, the grounding point 24 is disposed at a midpoint of the grounding arm 21, and the first dipole arm 121 and the second dipole arm 122 are symmetrically disposed about a central axis (not shown) of the antenna, which is a straight line where the midpoint of the feeding arm 11 and the midpoint of the grounding arm 21 are located.

As shown in fig. 3, the antenna provided by the second embodiment of the present invention is different from the first embodiment in that the first radiation arm 12 further includes a first reverse loading line 126 and a second reverse loading line 127, the first reverse loading line 126 and the second reverse loading line 127 are respectively connected to two ends of the first connection arm 125 and both extend toward one side of the feed arm 11, the first reverse loading line 126 and the first oscillator arm 121 are located on the same straight line, and the second reverse loading line 127 and the second oscillator arm 122 are located on the same straight line. An end of the first reverse load line 126 is spaced apart from an end of the first vibrator arm 121, and an end of the second reverse load line 127 is spaced apart from an end of the second vibrator arm 122.

In one embodiment, the first 126 and second 127 backloading lines are symmetrically disposed about a central axis of the antenna 10, which is a straight line that includes the midpoint of the feed arm 11 and the midpoint of the ground arm 21.

In one embodiment, the first dipole arm 121 and the second dipole arm 122 are high-frequency radiating arms, and the lengths of the first dipole arm 121 and the second dipole arm 122 are 1/8-3/4 of the high-frequency resonance wavelength. The impedance transformation feed band 123, the microstrip line 124, the first reverse loading line 126 and the second reverse loading line 127 are low-frequency radiating arms, and the total length of the impedance transformation feed band 123, the microstrip line 124, the first reverse loading line 126 and the second reverse loading line 127 is 1/8-3/4 of 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 third embodiment of the present invention provides an antenna, which is different from the second embodiment in that the impedance transformation feeding strip 123 is trapezoidal. It should be noted that in other embodiments, the impedance transforming feed strip 123 may also be elliptical.

As shown in fig. 2 to 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 extend toward a side away from the feed arm 11, one ends of the third dipole arm 221 and the fourth dipole arm 222 are connected to the ground arm 21, the fifth dipole arm 223 is bent from the other end of the third dipole arm 221 and extends toward a side of the ground arm 21, and one end of the fifth dipole arm 223 and the other end of the fourth dipole arm 222 are spaced apart. The fifth vibrator 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 vibrator arm 221, the second extension arm 2232 extends toward one side of the ground contact arm 21, and the fourth vibrator arm 222 and the second extension arm 2232 are in the same line.

The third radiating arm 23 includes a sixth oscillator arm 231, a seventh oscillator arm 232, and an eighth oscillator arm 233, the sixth oscillator arm 231 and the seventh oscillator arm 232 are disposed at an interval and extend toward a side away from the feed arm 11, one ends of the sixth oscillator arm 231 and the seventh oscillator arm 232 are connected to the ground arm 21, the eighth oscillator arm 233 is bent from the other end of the sixth oscillator arm 231 and extends toward a side of the ground arm 21, and one end of the eighth oscillator arm 233 and the other end of the seventh oscillator arm 232 are disposed at an interval. The eighth vibrator 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 vibrator arm 231, the fourth extension arm 2332 extends toward one side of the ground arm 21, and the seventh vibrator arm 232 and the fourth extension arm 2332 are in the same straight line.

In one embodiment, the second and third radiating

arms

22 and 23 are symmetrically disposed about a central axis of the antenna 10, the central axis of the antenna 10 being a straight line on which a midpoint of the feed arm 11 and a midpoint of the ground arm 21 are located. The fourth dipole arm 222 and the seventh dipole arm 232 are high-frequency dipole arms, and the lengths of the fourth dipole arm 222 and the seventh dipole arm 232 are 1/8-3/4 of the high-frequency resonance wavelength. The third vibrator arm 221, the second extension arm 2232, the sixth vibrator arm 231 and the fourth extension arm 2332 are low-frequency radiation arms, and the total length of the third vibrator arm 221 and the second extension arm 2232 is 1/8-3/4 of the low-frequency resonance wavelength; the total length of the sixth vibrator arm 231 and the fourth extension arm 2332 is 1/8-3/4 of the low frequency resonance wavelength.

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

Fig. 5 is an S parameter diagram of the antenna provided by the embodiment of the present invention, and it can be seen from the diagram that the antenna 10 can work at 900 MHz-940 MHz and 2.35 GHz-2.55 GHz, and the bandwidths are 40MHz (4.3%) and 200MHz (8.0%) respectively, which satisfy the coverage of the commonly used 900MHz and 2.45GHz frequency bands.

Fig. 6 is the directional diagram of the antenna provided by the embodiment of the present invention at 900MHz, fig. 7 is the directional diagram of the antenna provided by the embodiment of the present invention at 2.45GHz, and it can be known from the diagram that the antenna 10 can realize omnidirectional coverage at 900MHz and 2.45GHz, and the maximum value of the antenna radiation direction is in the horizontal direction.

The embodiment of the utility model provides an antenna 10, through set up the feed point 13 of being connected with coaxial line 3's inner conductor 31 on antenna 10's first radiation portion 1, set up the ground point 24 of being connected with coaxial line 3's outer conductor 32 on second radiation portion 2, second radiation portion 2 includes and is connected with the both ends of ground arm 21 respectively and all towards second radiation arm 22 and the third radiation arm 23 of keeping away from one side extension of feed arm 11 to form the open structure between second radiation arm 22 and third radiation arm 23, make the antenna influenced by the feeder cable for a short time. Because the low-frequency part of the antenna adopts a continuous bending structure, the size of the antenna is reduced, and the structure is simple. Different effective radiation parts of the antenna are utilized for different frequency bands, so that the antenna can work in double frequency, the omnidirectional radiation of directional diagrams in the two frequency bands is effectively ensured, and the maximum inclination angle is in the horizontal direction. The antenna adopts a structure with asymmetric upper and lower arms, so that the antenna has larger standing wave bandwidth, and the required standing wave bandwidth can be achieved within the limited length of the antenna.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. An antenna is characterized by comprising a first radiation part, a second radiation part and a coaxial line, wherein the coaxial line comprises an inner lead and an outer lead insulated and isolated from the inner lead;

2. The antenna of claim 1, wherein the first radiating arm comprises a first dipole arm, a second dipole arm, an impedance transformation feed strip disposed between the first dipole arm and the second dipole arm and connected to an end of the feed arm away from the ground arm, a multi-segment bent microstrip line connected to the impedance transformation feed strip, and a first connecting arm connected to the microstrip line; the first oscillator arm and the second oscillator arm are respectively connected with two ends of the feed arm and extend towards one side far away from the grounding arm.

3. The antenna of claim 2, wherein the first dipole arm and the second dipole arm are symmetrically disposed about a central axis of the antenna, the central axis of the antenna being a straight line on which a midpoint of the feed arm and a midpoint of the ground arm are located.

4. The antenna of claim 2, wherein 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 connected to both ends of the first connecting arm, respectively, and extend toward one side of the feeding arm, an end of the first reverse loading line and an end of the first dipole arm are spaced apart, and an end of the second reverse loading line and an end of the second dipole arm are spaced apart.

5. The antenna of claim 4, wherein the first and second backloaded lines are symmetrically disposed about a central axis of the antenna, the central axis of the antenna being a straight line that includes a midpoint of the feed arm and a midpoint of the ground arm.

6. The antenna of claim 2, wherein the impedance transformation feed strip is rectangular, trapezoidal, or elliptical.

7. The antenna of claim 1, wherein the second radiating arm comprises a third dipole arm, a fourth dipole arm and a fifth dipole arm, the third dipole arm and the fourth dipole arm are spaced apart and extend toward a side away from the feeding arm, one end of each of the third dipole arm and the fourth dipole arm is connected to the grounding arm, the fifth dipole arm is bent from the other end of the third dipole arm and extends toward a side of the grounding arm, and one end of the fifth dipole arm and the other end of the fourth dipole arm are spaced apart.

8. The antenna of claim 7, wherein the third radiating arm includes a sixth dipole arm, a seventh dipole arm and an eighth dipole arm, the sixth dipole arm and the seventh dipole arm are spaced apart and extend toward a side away from the feeding arm, one end of each of the sixth dipole arm and the seventh dipole arm is connected to the ground arm, the eighth dipole arm is bent from the other end of the sixth dipole arm and extends toward a side of the ground arm, and one end of the eighth dipole arm and the other end of the seventh dipole arm are spaced apart.

9. The antenna of claim 8, wherein the second radiating arm and the third radiating arm are symmetrically disposed about a central axis of the antenna, the central axis of the antenna being a straight line on which a midpoint of the feed arm and a midpoint of the ground arm are located.

10. The antenna of claim 1, further comprising a substrate, wherein the first radiating portion and the second radiating portion are both disposed on the substrate.

11. The antenna of claim 10, wherein the first radiating portion and the second radiating portion are disposed on a same side of the substrate.

12. The antenna of claim 11, wherein the coaxial line is disposed between the second radiating arm and the third radiating arm.

13. The antenna according to claim 10, wherein the substrate is a PCB board, a metal board, or an FPC board.

14. The antenna of claim 1, wherein the radiation frequency bands of the antenna include 900 MHz-940 MHz and 2.35 GHz-2.55 GHz.