CN110828990B

CN110828990B - An antenna

Info

Publication number: CN110828990B
Application number: CN201911063060.7A
Authority: CN
Inventors: 谭杰洪
Original assignee: Shenzhen Autel Intelligent Aviation Technology Co Ltd
Current assignee: Shenzhen Autel Intelligent Aviation Technology Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2025-01-21
Anticipated expiration: 2039-10-31
Also published as: CN110828990A; WO2021082807A1

Abstract

The present invention discloses an antenna, comprising a first radiating portion, a second radiating portion 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 radiating portion comprises a feeding arm and a first radiating arm connected to the feeding arm, a feeding point is arranged on the feeding arm, and the inner conductor is electrically connected to the feeding arm through the feeding point; the second radiating portion comprises a grounding arm, a second radiating arm and a third radiating arm, the grounding arm is arranged at intervals from the feeding arm, the second radiating arm and the third radiating arm are respectively connected to the two ends of the grounding arm and both extend toward a side away from the feeding arm; a grounding point is arranged on the grounding arm, and the outer conductor is electrically connected to the grounding arm through the grounding point. The present invention makes the antenna less affected by the feeding 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

Antenna

Technical Field

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

Background

With the rapid development of wireless communication, various data services are required, and the antenna design mainly develops toward miniaturization, multiple frequency bands and broadband, and miniaturization requires the antenna to reduce its size so as to adapt to the development trend of continuously improving the integration level and reducing the volume of communication equipment. The existing microstrip antenna is longer in size, the antenna is affected to a certain extent when the length of the antenna is limited, and two microstrip antennas of the antenna are fed simultaneously on the front side and the back side of the substrate by two feeding coaxial lines respectively, so that the feeding structure of the antenna is complex, and at least two ports are needed to be connected with the antenna by a feeding network in application.

Disclosure of Invention

In order to solve the problems of larger size and complex structure of the existing antenna, the invention aims to provide an antenna.

In order to achieve the above object, the present invention provides an antenna including a first radiating portion, a second radiating portion, and a coaxial line including an inner conductor and an outer conductor insulated 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 wire is electrically connected with the feed arm through the feed point;

The second radiating part comprises a grounding arm, a second radiating arm and a third radiating arm, the grounding arm and the feeding arm are arranged at intervals, the second radiating arm and the third radiating arm are respectively connected with two ends of the grounding arm and extend towards one side far away from the feeding arm, a grounding point is arranged on the grounding arm, and the outer conducting wire is electrically connected with the grounding arm through the grounding point.

Preferably, the first radiating arm comprises a first oscillator arm, a second oscillator arm, an impedance transformation feed belt, a multi-section bent microstrip line and a first connecting arm, wherein the impedance transformation feed belt is arranged between the first oscillator arm and the second oscillator arm and is connected with one end of the feed arm far away from the grounding arm, the multi-section bent microstrip line is connected with the impedance transformation feed belt, the first connecting arm is connected with the microstrip line, and 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 with two ends of the first connecting arm and all extend towards one side of the feeding arm, an end of the first reverse loading line and an end of the first vibrator arm are arranged at intervals, and an end of the second reverse loading line and an end of the second vibrator arm are arranged at intervals.

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 band is rectangular, trapezoidal or elliptical.

Preferably, the second radiating arm includes a third oscillator arm, a fourth oscillator arm and a fifth oscillator arm, the third oscillator arm and the fourth oscillator arm are arranged at intervals and all extend towards one side far away from the feed arm, one ends of the third oscillator arm and the fourth oscillator arm are connected with the grounding arm, the fifth oscillator arm is bent from the other end of the third oscillator arm and extends towards one side of the grounding arm, and one ends of the fifth oscillator arm and the other ends of the fourth oscillator arm are arranged at intervals.

Preferably, the third radiating arm includes a sixth oscillator arm, a seventh oscillator arm and an eighth oscillator arm, where the sixth oscillator arm and the seventh oscillator arm are arranged at intervals and all extend towards a side far away from the feed arm, one ends of the sixth oscillator arm and the seventh oscillator arm are connected with the grounding arm, the eighth oscillator arm bends from the other end of the sixth oscillator arm and extends towards one side of the grounding arm, and one ends of the eighth oscillator arm and the other ends of the seventh oscillator arm are arranged at intervals.

Preferably, the second radiating arm and the third radiating 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 feeding arm and a midpoint of the grounding arm are located.

Preferably, the antenna further comprises 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 disposed 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 comprises 900 MHz-940 MHz and 2.35 GHz-2.55 GHz.

Compared with the prior art, the antenna has the beneficial effects that the feeding point connected with the inner lead of the coaxial line is arranged on the first radiating part, the grounding point connected with the outer lead of the coaxial line is arranged on the second radiating part, and the second radiating part comprises the second radiating arm and the third radiating arm which are respectively connected with two ends of the grounding arm and extend towards one side far away from the feeding arm, so that a transparent structure is formed between the second radiating arm and the third radiating arm, the influence of a feeder cable on the antenna is small, the required standing wave bandwidth is achieved within the limited length of the antenna, the size of the antenna is reduced, and the antenna is simple in structure.

Drawings

Fig. 1 is a schematic diagram of an antenna according to an embodiment of the present invention;

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

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

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

fig. 5 is an S-parameter diagram of an antenna according to an embodiment of the present invention;

Fig. 6 is a diagram of an antenna at 900MHz according to an embodiment of the present invention;

fig. 7 is a diagram of an antenna at 2.45GHz according to an embodiment of the present invention;

10, antenna, 1, first radiating part, 11, feeding arm, 12, first radiating arm, 121, first radiating arm, 122, second radiating arm, 123, impedance transformation feeding band, 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, grounding arm, 22, second radiating arm, 221, third radiating arm, 222, fourth radiating arm, 223, fifth radiating arm, 2231, first extending arm, 2232, second extending arm, 23, third radiating arm, 231, sixth radiating arm, 232, seventh radiating arm, 233, eighth extending arm, 2331, third extending arm, 2332, outer conducting wire, 4, substrate, 24, grounding point, 3, coaxial line, 31, inner conducting wire, 32, and outer conducting wire.

Detailed Description

In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative 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. The term "and/or" as used in this specification 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 detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.

The embodiment of the invention provides an antenna 10, as shown in fig. 1, comprising a first radiating part 1, a second radiating part 2 and a coaxial line 3, wherein the coaxial line 3 comprises an inner wire 31 and an outer wire 32 insulated from the inner wire 31, the first radiating part 1 comprises a feed arm 11 and a first radiating arm 12 connected with the feed arm 11, a feed point 13 is arranged on the feed arm 11, the inner wire 31 is electrically connected with the feed arm 11 through the feed point 13 to feed the first radiating arm 12, the second radiating part 2 comprises a grounding arm 21, a second radiating arm 22 and a third radiating arm 23, the grounding arm 21 and the feed arm 11 are arranged at intervals, the grounding arm 21 is provided with a grounding point 24, the outer wire 32 is electrically connected with the grounding arm 21 through the grounding point 24, and the second radiating arm 22 and the third radiating 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 transparent structure is formed between the second radiating arm 22 and the third radiating arm 23, the antenna 10 is less influenced by cables, the limited length of the antenna 10 is realized, the required standing wave is reduced, the bandwidth is simple, and the antenna structure is achieved.

As shown in fig. 2, the antenna according to the first embodiment of the present invention includes a first radiating arm 121, a second radiating arm 122, an impedance conversion feeding strip 123 disposed between the first radiating arm 121 and the second radiating arm 122 and connected to one end of the feeding arm 11 far from the grounding arm 21, a multi-section folded microstrip line 124 connected to the impedance conversion feeding strip 123, and a first connecting arm 125 connected to the microstrip line 124, wherein the first radiating arm 121 and the second radiating arm 122 are respectively connected to both ends of the feeding arm 11 and extend toward one side far from the grounding arm 21. The impedance transformation feeding strip 123 is rectangular, the cross-sectional width of the impedance transformation feeding strip 123 is larger than the width of the microstrip line 124, and the microstrip line 124 includes four U-shaped bending portions 1241 which are periodically arranged.

In one embodiment, the feeding point 13 is disposed at a midpoint of the feeding arm 11, the ground point 24 is disposed at a midpoint of the ground 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 ground arm 21 are located.

As shown in fig. 3, the antenna according to the second embodiment of the present invention is different from the first embodiment in that the first radiating 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 connecting arm 125 and extend toward one side of the feeding arm 11, the first reverse loading line 126 and the first dipole arm 121 are on the same line, and the second reverse loading line 127 and the second dipole arm 122 are on the same line. The end of the first reverse loading line 126 is spaced from the end of the first vibrator arm 121, and the end of the second reverse loading line 127 is spaced from the end of the second vibrator arm 122.

In one embodiment, the first and second reverse loading lines 126 and 127 are symmetrically disposed about the central axis of the antenna, the central axis of the antenna 10 being a straight line where the midpoint of the feed arm 11 and the midpoint of the ground arm 21 are located.

In one embodiment, the first and second vibrator arms 121 and 122 are high frequency radiating arms, and the length of the first and second vibrator arms 121 and 122 is 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 radiation 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 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 third embodiment of the present invention provides an antenna which is different from the second embodiment in that the impedance transforming feed strip 123 has a trapezoid shape. In other embodiments, the impedance transformation feed band 123 may 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 disposed at intervals and both extend toward a side far away from the feeding arm 11, one ends of the third dipole arm 221 and the fourth dipole arm 222 are connected to the grounding arm 21, the fifth dipole arm 223 is bent from the other end of the third dipole arm 221 and extends toward the side of the grounding arm 21, and one end of the fifth dipole arm 223 and the other end of the fourth dipole arm 222 are disposed at intervals. 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 arm 21, and the fourth vibrator arm 222 and the second extension arm 2232 are on the same line.

The third radiating arm 23 includes a sixth vibrator arm 231, a seventh vibrator arm 232, and an eighth vibrator arm 233, where the sixth vibrator arm 231 and the seventh vibrator arm 232 are disposed at intervals and all extend toward a side far away from the feeding arm 11, one ends of the sixth vibrator arm 231 and the seventh vibrator arm 232 are connected to the grounding arm 21, and the eighth vibrator arm 233 is bent from the other end of the sixth vibrator arm 231 and extends toward a side of the grounding arm 21, and one ends of the eighth vibrator arm 233 and the other end of the seventh vibrator arm 232 are disposed at intervals. 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 on the same straight line.

In one embodiment, the second radiating arm 22 and the third radiating arm 23 are symmetrically disposed about a central axis of the antenna 10, the central axis of the antenna 10 being a straight line where the midpoint of the feeding arm 11 and the midpoint of the grounding arm 21 are located. The fourth and seventh arms 222 and 232 are high frequency arms, and the lengths of the fourth and seventh arms 222 and 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, 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, and 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, where 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 board, a metal board, or an FPC board. Preferably, the first radiating portion 1 and the second radiating portion 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 an S-parameter diagram of an antenna according to an embodiment of the present invention, where it can be seen that the antenna 10 can operate at 900 MHz-940mhz and 2.35 GHz-2.55 GHz, and the bandwidths are 40MHz (4.3%) and 200MHz (8.0%), respectively, so as to meet the coverage of the commonly used 900MHz and 2.45GHz frequency bands.

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

In the antenna 10 provided by the embodiment of the invention, the feeding point 13 connected with the inner wire 31 of the coaxial wire 3 is arranged on the first radiating part 1 of the antenna 10, the grounding point 24 connected with the outer wire 32 of the coaxial wire 3 is arranged on the second radiating part 2, and the second radiating part 2 comprises the second radiating arm 22 and the third radiating arm 23 which are respectively connected with two ends of the grounding arm 21 and extend towards one side far away from the feeding arm 11, so that a transparent structure is formed between the second radiating arm 22 and the third radiating arm 23, and the influence of a feeder cable on the antenna is small. 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 frequencies, the omnidirectional radiation of directional patterns in the two frequency bands is effectively ensured, and the maximum inclination angle is in the horizontal direction. The antenna adopts an asymmetric structure of the upper arm and the lower arm, so that the antenna has larger standing wave bandwidth, and the required standing wave bandwidth is achieved within the limited length of the antenna.

The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.

Claims

1. An antenna, characterized in that it comprises a first radiating portion, a second radiating portion 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 radiating portion comprises a feeding arm and a first radiating arm connected to the feeding arm, a feeding point is provided on the feeding arm, and the inner conductor is electrically connected to the feeding arm through the feeding point;

The second radiating portion includes a ground arm, a second radiating arm and a third radiating arm, the ground arm is spaced apart from the feeding arm, the second radiating arm and the third radiating arm are respectively connected to both ends of the ground arm and both extend toward a side away from the feeding arm; a grounding point is provided on the ground arm, and the external conductor is electrically connected to the ground arm through the grounding point; the first radiating arm includes a first dipole arm, a second dipole arm, an impedance transformation feeding strip provided between the first dipole arm and the second dipole arm and connected to one end of the feeding arm away from the ground arm, a multi-section bent microstrip line connected to the impedance transformation feeding strip, and a first connecting arm connected to the microstrip line; the first radiating arm also 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 both ends of the first connecting arm and both extend toward one side of the feeding arm, an end of the first reverse loading line is spaced apart from an end of the first dipole arm, and an end of the second reverse loading line is spaced apart from an end of the second dipole arm.

2 . The antenna according to claim 1 , wherein the first dipole arm and the second dipole arm are respectively connected to two ends of the feeding arm and both extend toward a side away from the ground arm.

3. The antenna as claimed in claim 2 is characterized in that the first dipole arm and the second dipole arm are symmetrically arranged about the central axis of the antenna, and the central axis of the antenna is a straight line where the midpoint of the feed arm and the midpoint of the ground arm are located.

4. The antenna as claimed in claim 1 is characterized in that the first reverse loading line and the second reverse loading line are symmetrically arranged about the central axis of the antenna, and the central axis of the antenna is a straight line where the midpoint of the feed arm and the midpoint of the ground arm are located.

5. The antenna according to claim 1, characterized in that the impedance transformation feeding strip is rectangular, trapezoidal or elliptical.

6. The antenna as described in claim 1 is characterized in that the second radiating arm includes 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 both extend toward a side away from the feeding arm, one end of the third dipole arm and the fourth dipole arm are both connected to the ground arm, the fifth dipole arm is bent from the other end of the third dipole arm and extends toward one side of the ground arm, and one end of the fifth dipole arm and the other end of the fourth dipole arm are spaced apart.

7. The antenna as described in claim 6 is characterized in that 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 both extend toward a side away from the feeding arm, one end of the sixth dipole arm and the seventh dipole arm are both connected to the ground arm, the eighth dipole arm is bent from the other end of the sixth dipole arm and extends toward one 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.

8. The antenna as claimed in claim 7 is characterized in that the second radiating arm and the third radiating arm are symmetrically arranged about the central axis of the antenna, and the central axis of the antenna is a straight line where the midpoint of the feeding arm and the midpoint of the grounding arm are located.

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

10 . The antenna according to claim 9 , wherein the first radiating portion and the second radiating portion are disposed on the same side of the substrate.

11. The antenna according to claim 10, wherein the coaxial line is arranged between the second radiating arm and the third radiating arm.

12. The antenna according to claim 9, wherein the substrate is a PCB board, a metal board or an FPC board.

13. The antenna according to claim 1, characterized in that the radiation frequency band of the antenna includes 900 MHz to 940 MHz and 2.35 GHz to 2.55 GHz.