WO2021120051A1

WO2021120051A1 - Antenna

Info

Publication number: WO2021120051A1
Application number: PCT/CN2019/126294
Authority: WO
Inventors: 吕洪辉
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2021-06-24

Abstract

The present invention provides an antenna, comprising an antenna radiation unit, a ground unit, and a feed unit. The antenna radiation unit is provided with two straight grooves and several curved grooves; the two straight grooves are perpendicular to each other and run through the antenna radiation unit; the two straight grooves divide the antenna radiation unit into four sub-antenna radiation units; the several curved grooves are distributed at equal intervals on a circumference part of the antenna radiation unit; the several curved grooves are all used for dividing current lines generated by the four sub-antenna radiation units. The beneficial effects of the present invention are that: the provision of the two straight grooves and several curved grooves on the antenna radiation unit increases the resonance path and expands the antenna bandwidth; it is also ensured that the current on the antenna radiation unit flows in an orthogonal direction, and the isolation between ports is improved.

Description

An antenna

Technical field

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

Background technique

With the arrival of the fifth-generation mobile communication technology, higher requirements have been put forward on the broadband characteristics and isolation of base station antennas. MIMO antenna technology is the core technology of 5G (5th generation mobile networks) communication. The application of multiple antennas will lead to huge challenges in antenna isolation. The isolation between antenna ports will directly affect system reception. Channel sensitivity and receiver stability.

The main methods of improving antenna isolation in existing antennas are differential feeding method or hybrid feeding method; however, the differential feeding method increases the difficulty and complexity of antenna feeding network design, and the structure of the hybrid feeding method is asymmetrical, resulting in It is difficult to maintain the consistency of dual-port S-parameters and radiation characteristics.

Therefore, there is an urgent need for an antenna that can achieve a wide frequency band while ensuring high isolation.

technical problem

The object of the present invention is to provide an antenna to solve the problem that the existing antenna cannot achieve a wide frequency band while ensuring high isolation.

Technical solutions

The technical scheme of the present invention is as follows: an antenna including an antenna radiating unit, a grounding unit and a feeding unit;

The antenna radiating unit is provided with two linear grooves and a plurality of curved grooves, the two linear grooves are perpendicular to each other and both pass through the antenna radiating unit, and the two linear grooves divide the antenna radiating unit into four sub-antennas Radiating unit, the plurality of curved grooves are all distributed at equal intervals on the circumference of the geometric center of the antenna radiating unit, and the plurality of curved grooves are all used to divide the current lines generated by the four sub-antenna radiating units;

The ground unit is provided with a plurality of coupling slots, the plurality of coupling slots are coupled to the four sub-antenna radiating units, and the four sub-antenna radiating units are also electrically connected to the ground unit respectively;

The feeding unit is coupled to the coupling slot.

As an improvement, the plurality of curved grooves are distributed on a circle with the geometric center of the radiating element as the center, and each of the sub-antenna radiating elements is provided with two spaced curved grooves, and each One of the curved grooves communicates with the adjacent linear grooves.

As an improvement, the plurality of coupling slots includes two first linear coupling slots that are perpendicular to each other, and two ends of each first linear coupling slot are perpendicularly connected to a second linear coupling slot to form H Arrangement;

The ground unit forms four quadrant regions through the two first linear coupling slots, and the four sub-antenna radiation units are electrically connected to the four quadrant regions of the ground unit one by one.

As an improvement, the antenna includes four grounding posts to electrically connect the grounding unit and the sub-antenna radiating unit, and the connection between the grounding post and the sub-antenna radiating unit is located in the circle where the curved groove is located. Inside.

As an improvement, the end of the first linear coupling slot is connected to the midpoint of the second linear coupling slot.

As an improvement, the feed unit includes two differential feed lines, and each of the differential feed lines is coupled to a second linear coupling slot at both ends of the first linear coupling slot.

As an improvement, each of the differential feeder lines includes a feeder port, two first feeders that diverge from the feeder port and form a U-shape, and the two first feeders away from each other. A second feeder line extending from the end of the feeder port to the U-shape, the second feeder line is perpendicular to the first feeder line, and the second feeder line is coupled to the second linear coupling gap Opposite vertically.

As an improvement, the antenna further includes a bottom substrate;

The ground unit includes a layered metal ground, the coupling gap is opened on the layered metal ground, and the layered metal ground is provided on the surface of the base substrate facing the antenna radiation unit;

The feeding unit is arranged inside the bottom substrate and a surface away from the antenna radiation unit.

As an improvement, the two first feed lines meet at a conflict on the surface of the bottom substrate, and one of the first feed lines includes two spaced-apart main bodies arranged on the surface of the bottom substrate Part and a avoiding part arranged in the bottom substrate, the avoiding part being located at the conflict and connecting the two main body parts.

Beneficial effect

The beneficial effects of the present invention are:

By opening two straight grooves and several curved grooves on the antenna radiating unit, the resonance path is increased and the antenna bandwidth is expanded; the current on the antenna radiating unit can be ensured to flow in the orthogonal direction, and the isolation between ports can be improved.

Description of the drawings

FIG. 1 is a three-dimensional structural diagram of an antenna provided by an embodiment of the present invention;

Figure 2 is a schematic diagram of the exploded structure of Figure 1;

Fig. 3 is a top view of the antenna radiating unit and the grounding unit in Fig. 1;

4 is a schematic diagram of the positional relationship between the feeding unit and the coupling slot in FIG. 2;

FIG. 5 is a curve of antenna return loss versus frequency according to an embodiment of the present invention;

Fig. 6 is an antenna standing wave ratio variation curve with frequency according to an embodiment of the present invention;

FIG. 7 is a curve of isolation between antenna ports as a function of frequency according to an embodiment of the present invention;

FIG. 8 is a radiation pattern diagram when the first port of the antenna is excited according to an embodiment of the present invention;

FIG. 9 is a radiation pattern diagram when the second port of the antenna provided by an embodiment of the present invention is excited.

In the figure: 10, antenna radiating element; 11, curved groove; 12, linear groove; 13, sub-antenna radiating element; 14, top substrate; 20, grounding unit; 21, layered metal ground; 211, first quadrant area; 212. Second quadrant area; 213. Third quadrant area; 214. Fourth quadrant area; 22. Coupling gap; 221. First linear coupling gap; 222. Second linear coupling gap; 23. Underlying substrate; 30. Grounding post; 40, feeder unit; 41, first feeder line; 411, main body part; 412, avoidance part; 42, second feeder line; 43, first feeder port; 44, second feeder port.

Embodiments of the present invention

The present invention will be further described below in conjunction with the drawings and embodiments.

1 and 2, an embodiment of the present invention provides an antenna, including an antenna radiating unit 10, a grounding unit 20, and a feeding unit 40 (not shown in FIG. 1). The antenna radiating unit 10 is provided with A plurality of curved grooves 11 and a plurality of linear grooves 12. In one embodiment, the number of the plurality of linear grooves 12 is two, and the two linear grooves 12 are perpendicular to each other and both pass through the antenna radiating unit 10. The intersection of the slots 12 coincides with the geometric center of the antenna radiating unit 10 (refer to the o1 point in FIG. 2). The two linear slots 12 divide the antenna radiating unit 10 into four sub-antenna radiating units; the several curves The grooves 11 are all distributed at equal intervals around the geometric center of the antenna radiating unit 10, and the several curved grooves 11 are used to divide the current lines generated by the four sub-antenna radiating units 13.

The ground unit 20 is provided with a number of coupling slots 22. The ground unit 20 is coupled to the four sub-antenna radiating units 13 through a number of coupling slots 22. The four sub-antenna radiating units 13 are also connected to the ground unit respectively. 20 Electrical connection.

The feeding unit 40 is coupled to the plurality of coupling slots 22, so that the antenna radiating unit 10 is fed in the form of magnetic coupling between the plurality of coupling slots 22 and the feeding unit 40; A number of curved grooves 11 and two straight grooves 12 are provided on 10, thereby increasing the resonance path and expanding the antenna bandwidth; it can also ensure that the current on the antenna radiating unit 10 flows in the orthogonal direction and improve the isolation between ports.

Preferably, the antenna further includes a base substrate 23, the ground unit 20 includes a layered metal ground 21, the coupling gap 22 is opened on the layered metal ground 21, and the layered metal ground 21 is provided on the ground. The bottom substrate 23 faces the surface of the antenna radiating unit 10; the feeding unit 40 is disposed inside the bottom substrate 23 and a surface away from the antenna radiating unit 10.

Preferably, the antenna further includes a top substrate 14, and the four sub-antenna radiation units 13 are arranged on the surface of the top substrate 14 away from the ground unit 20.

Please refer to FIG. 3. Specifically, in one embodiment, a plurality of curved grooves 11 are distributed on a circle centered on the geometric center of the radiating element 10 (refer to the o1 point in FIG. 2), and each sub The antenna radiating unit 13 is provided with two spaced curved grooves 11, and each of the curved grooves 11 is connected to the adjacent linear groove 12; the four curved grooves 11 and the two linear grooves 12 are used to improve The isolation of the antenna and the expansion of the working bandwidth of the antenna.

In one embodiment, the plurality of coupling slits 22 includes two first linear coupling slits 221 that are perpendicular to each other and bisect each other, and two ends of each first linear coupling slit 221 are connected to a second linear coupling slit 222. Are connected vertically to form an H-shaped arrangement; the ground unit 20 forms four quadrant regions (211, 212, 213, 214) through the two first linear coupling slots 22, and the four sub-antenna radiating units 13 are respectively connected to the ground unit The four quadrants (211,212,213,214) are electrically connected one by one.

The antenna includes four grounding posts 30, and the four sub-antenna radiating units 13 are respectively connected to the first quadrant area 211, the second quadrant area 212, and the third quadrant of the layered metal ground 21 through the four grounding posts 30. The area 213 and the fourth quadrant area 214 are electrically connected one by one to electrically connect the grounding unit 20 and the sub-antenna radiating unit 13. The connection between the grounding post 30 and the sub-antenna radiating unit 13 is located on the curve The slot 11 is located within the circle; the end of the first linear coupling slot 221 is connected to the midpoint of the second linear coupling slot 222, the two first linear coupling slots 221 and the four second straight lines The coupling slot 222 can be used to adjust the antenna impedance matching.

4, the feed unit 40 includes two differential feed lines, each of the differential feed lines is coupled to a second linear coupling slot 222 at both ends of the first linear coupling slot 221; each The differential feeder line includes a feeder port (first feeder port 43 or second feeder port 44), two first feeders 41 that diverge from the feeder port and form a U shape, and The ends of the two first feed lines 41 away from the feed port extend toward the U-shaped second feed line 42. The second feed line 42 is perpendicular to the first feed line 41, and the second feed line 42 is perpendicular to the first feed line 41. The second feed line 42 is perpendicular to the second linear coupling slot 222.

More specifically, the two first feed lines 41 meet at a conflict on the surface of the bottom substrate 23, and one of the first feed lines 41 includes two first feed lines 41 arranged on the surface of the bottom substrate 23. The main body portions 411 are spaced apart and the avoiding portions 412 provided in the base substrate 23, the avoiding portions 412 are located at the conflicting location and are connected to the two main body portions 411, the avoiding portions 412 and the two second The other one of the feeders 41 is not in the same plane, so as to prevent the two first feeders 41 from being short-circuited at the conflict.

In an embodiment, the antenna involved is a 5G base station antenna, more specifically, the 5G base station antenna is a dual-polarized antenna; in terms of technology, the 5G base station antenna may be a PCB (Printed Circuit Board, printed circuit board). ) Process, LDS (Laser Direct Structuring, laser direct molding) process or electroplating process; 5G base station antenna is characterized by low profile and high isolation; the height of the size is less than 10mm, the isolation in the frequency band is better than 38dB, and the 5G base station antenna works at 3400-3800MHz, but Not limited to this frequency band, the antenna can be adjusted to work in other frequency bands, such as 2500-2700 MHz, and 4800-5000 MHz, which are all within the limitation range of this embodiment. Please refer to Figure 5 to Figure 9 for the specific performance of this antenna.

The following briefly describes the working principle of the antenna provided by the present invention: After the ports of the two U-shaped feeders (41, 42) receive external excitation, the two arms of each U-shaped feeder pass through two first coupling slots 221 and The four second coupling slots 222 further excite four sub-antenna radiation units 13, and the four sub-antenna radiation units 13 radiate radio waves.

It should be noted that all the directional indicators (such as up, down, inside, outside, top, bottom...) in the embodiments of the present invention are only used to explain the difference between the components in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, the element may be directly on the other element or a centering element may exist at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

An antenna, characterized in that it comprises an antenna radiating unit, a grounding unit and a feeding unit;

The antenna radiating unit is provided with two linear grooves and a plurality of curved grooves, the two linear grooves are perpendicular to each other and both pass through the antenna radiating unit, and the two linear grooves divide the antenna radiating unit into four sub-antennas Radiating unit, the plurality of curved grooves are all distributed at equal intervals around the geometric center of the antenna radiating unit, and the plurality of curved grooves are all used to divide the current lines generated by the four sub-antenna radiating units;

The ground unit is provided with a plurality of coupling slots, the plurality of coupling slots are coupled to the four sub-antenna radiating units, and the four sub-antenna radiating units are also electrically connected to the ground unit respectively;

The feeding unit is coupled to the coupling slot.
The antenna according to claim 1, wherein the plurality of curved grooves are distributed on a circle centered on the geometric center of the radiating element, and each of the sub-antenna radiating elements is provided with two spaces The curved grooves, and each of the curved grooves communicates with the adjacent linear grooves.
The antenna according to claim 2, wherein the plurality of coupling slots comprise two first linear coupling slots that are perpendicular to each other, and two ends of each first linear coupling slot are connected to a second The straight coupling gaps are connected vertically to form an H-shaped arrangement;

The ground unit forms four quadrant regions through the two first linear coupling slots, and the four sub-antenna radiation units are electrically connected to the four quadrant regions of the ground unit one by one.
The antenna of claim 3, wherein the antenna includes four grounding posts to electrically connect the grounding unit and the sub-antenna radiating unit, and the connection between the grounding post and the sub-antenna radiating unit Located in the circle where the curved groove is located.
The antenna according to claim 3, wherein the end of the first linear coupling slot is connected to the midpoint of the second linear coupling slot.
The antenna according to claim 3, wherein the feed unit includes two differential feed lines, each of the differential feed lines is coupled to a second line at both ends of the first linear coupling slot Gap coupling.
The antenna according to claim 6, wherein each of the differential feeder lines includes a feeder port, two first feeders that diverge from the feeder port and form a U-shape, and The end of the first feeder line away from the feeder port is a second feeder line extending outside the U shape, the second feeder line is perpendicular to the first feeder line, and the second feeder line It is perpendicularly opposite to the second linear coupling gap.
8. The antenna of claim 7, wherein the antenna further comprises a base substrate;

The ground unit includes a layered metal ground, the coupling gap is opened on the layered metal ground, and the layered metal ground is provided on the surface of the base substrate facing the antenna radiation unit;

The feeding unit is arranged inside the bottom substrate and a surface away from the antenna radiation unit.
8. The antenna according to claim 8, wherein: two of the first feeder lines meet at a conflict on the surface of the base substrate, and one of the first feeder lines includes one disposed on the base substrate Two main body parts arranged at intervals on the surface and a avoiding part arranged in the bottom substrate, the avoiding part being located at the conflict and connecting the two main body parts.