CN212366219U - Directional antenna - Google Patents

Abstract

A directional antenna, comprising: a substrate, a first antenna, a second antenna and an isolation part. The substrate is a multilayer board, and the substrate at least comprises a first layer board and a second layer board: the first antenna is arranged on the first layer plate and the second layer plate and comprises a first reflector, a first radiator and a plurality of first directors; the second antenna is arranged on the first layer plate and the second layer plate, and the first antenna comprises a second reflector, a second radiator and a plurality of second directors; and the isolation part is arranged on the first laminate and the second laminate and is positioned between the first antenna and the second antenna. The structure can achieve the purpose of improving the directivity of the antenna, and the mutual interference of the two antennas can be reduced and the consistency of the main beam directions of the two antennas can be improved through the arrangement of the isolation part.

Description

Directional antenna

Technical Field

The present invention relates to an antenna, and more particularly to a directional antenna.

Background

An antenna structure of a conventional smart glasses, such as taiwan bulletin No. I589950 "a glasses type communication device", has an antenna that is a coupled monopole antenna (parasitic-type monopole antenna), and includes a radiation portion, a parasitic portion, and a matching portion. The antenna is operated in the 2.4GHz band and the 5GHz band.

Further, as shown in CN110635223, "a 4G-MIMO intelligent glasses antenna", it uses the structure of loop antenna and monopole antenna to cover the low frequency band of 4G between 824 and 960MHz and the high frequency band of 4G between 1710 and 2690 MHz.

However, with the advent of the 5G era, many electronic devices are equipped with antenna structures capable of receiving 5G signals. As mentioned above, the antenna structure of the existing smart glasses is not yet integrated with the 5G technology. Furthermore, limited by the size and weight requirements of smart glasses, an antenna structure with a small size, suitable for wearable electronic devices, and having high bandwidth, high speed and low delay characteristics needs to be developed.

Therefore, how to solve the above problems is a difficult technical problem that the inventors of the present invention want to solve.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is therefore an object of the present invention to solve the problems of the prior art.

To achieve the above object, the present invention provides a directional antenna, which includes: a substrate, a first antenna, a second antenna and an isolation part. The substrate is a multilayer board, and the substrate at least comprises a first layer board and a second layer board; the first antenna is arranged on the first layer plate and the second layer plate and comprises a first reflector, a first radiator and a plurality of first directors; the second antenna is arranged on the first layer plate and the second layer plate, and the first antenna comprises a second reflector, a second radiator and a plurality of second directors; and the isolation part is arranged on the first laminate and the second laminate and is positioned between the first antenna and the second antenna.

Preferably, the first radiator includes a first feeding portion and a second feeding portion, the first feeding portion is disposed on the first layer board, and the second feeding portion is disposed on the second layer board.

Preferably, the second radiator includes a third feeding portion and a fourth feeding portion, the third feeding portion is disposed on the first layer board, and the fourth feeding portion is disposed on the second layer board.

Preferably, the first feeding part and the second feeding part have a second distance therebetween and do not overlap each other.

Preferably, the third feeding part and the fourth feeding part have a second distance therebetween and do not overlap each other.

Preferably, the first reflector, the first radiator and the plurality of first directors are metal conductors printed on the substrate.

Preferably, the second reflector, the second radiator and the plurality of second directors are metal conductors printed on the substrate.

Preferably, the first radiator is formed between the first reflector and the plurality of first directors.

Preferably, the second radiator is formed between the second reflector and the plurality of second directors.

Preferably, the substrate is provided with a plurality of through holes, and the plurality of through holes penetrate through the substrate.

The utility model discloses a purpose of this structure in order to reach promotion antenna directive property, and in addition through the setting of this isolation portion, reduce the mutual interference of two antennas and promote the uniformity of two antenna main beam directions.

Drawings

Fig. 1 is a front view of the directional antenna of the present invention.

Fig. 2 is a side surface of the directional antenna of the present invention.

Fig. 3 is an exploded view of the directional antenna of the present invention.

Fig. 3A is a schematic diagram of a second pitch.

Fig. 4 is a frequency-reflection coefficient relationship diagram of the directional antenna of the present invention.

Fig. 5 is a radiation pattern diagram of a second antenna of the directional antenna of the present invention.

Fig. 6 is a radiation pattern diagram of the first antenna of the directional antenna of the present invention.

Description of reference numerals: 1-a substrate; 11-a first layer plate; 12-a second layer plate; 13-third layer board; 14-a fourth layer; 2-a first antenna; 21-a first reflector; 22-a first radiator; 221-a first feed-in part; 222-a second feed-in part; 23-a first guide; 3-a second antenna; 31-a second reflector; 32-a second radiator; 321-a third feed-in part; 322-a fourth feed-in part; 33-a second guide; 4 a-a spacer; 4 b-a spacer; 5-through hole; s1 — first spacing; s2 — second spacing; s3 — third spacing; s4-fourth pitch.

Detailed Description

Referring to fig. 1 and 2, the present invention provides a directional antenna, which includes: a substrate 1, a first antenna 2, a second antenna 3 and a separation part 4a, 4 b.

The substrate 1 is a planar plate, the substrate 1 may be a Printed Circuit Board (PCB) or a metal structure plate, and may be made of an insulating material such as plastic, glass fiber, bakelite, etc., and a metal conductor such as silver, copper, etc. may be coated or plated thereon to form an antenna structure. In the embodiment, the substrate 1 is a Printed Circuit Board (PCB), and the substrate 1 is a multi-layer board, each of which is composed of a dielectric layer (epoxy resin, glass fiber) and a high-purity conductive layer (copper foil), and the dielectric layer is hollow, however, the structure of the PCB is the prior art, and thus the description thereof is omitted in this embodiment.

Referring to fig. 3, the substrate 1 is a multi-layer board, the substrate 1 at least includes a first layer board 11 and a second layer board 12, the multi-layer board may include first to nth layer board structures stacked in sequence, and N may be a positive integer greater than 2. In the present embodiment, the multilayer board has four layers, including the first layer board 11, the second layer board 12, a third layer board 13 and a fourth layer board 14. In terms of function, the first plate 11 and the second plate 12 are component layers for disposing the antenna traces and electronic components, and the third plate 13 and the fourth plate 14 are a power layer and a ground layer, respectively. The substrate 1 can be made of RO4350B and RO4450F manufactured by Rogers Corporation, but the types of the circuit boards are not limited to the above, and suitable types of circuit boards can be selected according to actual requirements.

Referring to fig. 1 and fig. 2 (as shown in fig. 3), the first antenna 2 is disposed on the first layer board 11 and the second layer board 12, and the first antenna 2 includes a first reflector 21, a first radiator 22 and a plurality of first directors 23. The first antenna 2 may be a printed yagi antenna, and the first reflector 21, the first radiator 22 and the first directors 23 are metal conductors printed on the substrate 1.

The first reflector 21 is disposed on the substrate 1, the first reflector 21 is a metal conductor, and the first reflector 21 may be a strip. The first radiator 22 is disposed on the substrate 1, a first distance S1 is formed between the first radiator 22 and the first reflector 21, the first radiator 22 includes a first feeding portion 221 and a second feeding portion 222, the first feeding portion 221 is disposed on the first layer board 11, and the second feeding portion 222 is disposed on the second layer board 12. The first feeding portion 221 and the second feeding portion 222 have a second distance S2 therebetween and do not overlap with each other (as shown in fig. 3A). The first radiator 22 may be a printed dipole antenna, and the lateral length of the first radiator 22 is smaller than that of the first reflector 21.

The first guides 23 are located at one side of the first radiator 22, a third distance S3 is provided between the first guides 23 and the first radiator 22, a fourth distance S4 is provided between each of the first guides 23, and the lateral length of the first guides 23 is smaller than that of the first radiator 22. The first reflector 21, the first radiator 22 and the plurality of first directors 23 are sequentially disposed on the substrate 1 in the same direction. And, the first radiator 22 is formed between the first reflector 21 and the plurality of first directors 23.

The second antenna 3 is disposed on the first layer board 11 and the second layer board 12, and the second antenna 3 includes a second reflector 31, a second radiator 32 and a plurality of second directors 33. The second antenna 3 can be a printed yagi antenna, and the second reflector 31, the second radiator 32 and the second directors 33 are metal conductors printed on the substrate 1.

The second reflector 31 is disposed on the substrate 1, the second reflector 31 is a metal conductor, and the second reflector 31 may be a strip. The second radiator 32 is disposed on the substrate 1, the first space S1 is formed between the second radiator 32 and the second reflector 31, the second radiator 32 includes a third feeding portion 321 and a fourth feeding portion 322, the third feeding portion 321 is disposed on the first layer board 11, and the fourth feeding portion 322 is disposed on the second layer board 12. The third feeding element 321 and the fourth feeding element 322 have the second spacing S2 therebetween and do not overlap with each other. The second radiator 32 may be a printed dipole antenna, and the lateral length of the second radiator 32 is smaller than that of the second reflector 31.

The plurality of second directors 33 are located at one side of the second radiator 32, the third distance S3 exists between the second directors 33 and the second radiator 32, the fourth distance S4 exists between the plurality of second directors 33, and the lateral length of the plurality of second directors 33 is smaller than the lateral length of the second radiator 32. The second reflector 31, the second radiator 32 and the plurality of second directors 33 are sequentially disposed on the substrate 1 in the same direction. And, the second radiator 32 is formed between the second reflector 31 and the plurality of second directors 33.

The pitches include the first pitch S1, the second pitch S2, the third pitch S3 and the fourth pitch S4, which may be determined according to actual requirements.

The isolation portion 4a is disposed on the first layer plate 11, and the isolation portion 4b is disposed on the second layer plate 12 and located between the first antenna 2 and the second antenna 3. The isolation portion 4a and the isolation portion 4b are strip-shaped and connected by a plurality of through holes 5(Via), such as circular holes, and it should be noted that the arrangement of the plurality of through holes 5 should avoid affecting the routing of the first antenna 2 and the second antenna 3. Since the substrate 1 is a multi-layer board, the substrate 1 needs to be provided with the plurality of through holes 5, the plurality of through holes 5 penetrate through the multi-layer board, and the plurality of through holes 5 block the antenna waves of the first antenna 2 and the second antenna 3 from rebounding to the ground layer of the substrate 1, so that the rebounding antenna waves are isolated like a fence, and the substrate has the function of impedance Matching (Iimpedance Matching). The isolation portions 4a and 4b are used to isolate the mutual interference between the first antenna 2 and the second antenna 3 and to improve the consistency of the main beam directions of the two antennas.

It should be noted that the number of the first directors 23 and the second directors 33 can be adjusted according to actual requirements to adjust the directivity of the directional antenna.

Please refer to fig. 4, which shows a frequency-Reflection Coefficient (Reflection Coefficient) relationship diagram of the directional antenna. It can be seen from the frequency-reflection coefficient relationship that the reflection coefficient of the directional antenna at the frequency of 57-64 GHz can be less than-10 dB, so that the directional antenna is suitable for the ISM Band of 57-64 GHz, which is an Industrial Scientific Medical Band (ISM Band for short) without license or cost.

Fig. 5 and 6 show radiation field diagrams of the directional antenna, where fig. 5 is a radiation field diagram of a first antenna, fig. 6 is a radiation field diagram of a second antenna, a maximum actual Gain (real Gain) of the directional antenna is about 6dBi, and a Half Power Beam Width (HPBW) of the directional antenna is about 55 degrees.

Therefore, the directional antenna has two sets of yagi antennas (i.e., the first antenna 2 and the second antenna 3) on the substrate 1, so that the directional antenna is suitable for wearable electronic devices such as smart glasses, wherein the yagi antenna has a high directivity. Meanwhile, the directional antenna is also suitable for an ISM frequency band of 57-64 GHz, so as to meet the new application requirement created by the 5G communication technology and achieve the characteristics of high bandwidth, high speed and low delay. Moreover, the isolation portions 4a and 4b can improve the interference problem between the antennas, avoid the mutual influence between the first antenna 2 and the second antenna 3, and improve the consistency of the main beam directions of the two antennas.

In summary, the directional antenna has the following advantages:

1. small size and is suitable for wearable electronic equipment.

2. The method is suitable for the ISM frequency band of 57-64 GHz.

3. High bandwidth, high rate, low latency.

4. The problem of interference between two antennas is solved, and the consistency of the main beam direction of the two antennas is improved.

5. High directivity.

The above discussion is merely a preferred embodiment of the present invention, and is not intended to limit the scope of the invention; therefore, the equivalent shapes, structures or combinations of the components are all covered by the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims (10)

1. A directional antenna, comprising:

a substrate which is a multilayer board and at least comprises a first layer board and a second layer board;

the first antenna is arranged on the first layer plate and the second layer plate and comprises a first reflector, a first radiator and a plurality of first directors;

the second antenna is arranged on the first layer plate and the second layer plate and comprises a second reflector, a second radiator and a plurality of second directors; and

and the isolation part is arranged on the first laminate and the second laminate and is positioned between the first antenna and the second antenna.

2. The directional antenna as claimed in claim 1, wherein the first radiator includes a first feeding portion and a second feeding portion, the first feeding portion is disposed on the first layer, and the second feeding portion is disposed on the second layer.

3. The directional antenna as claimed in claim 1, wherein the second radiator includes a third feeding portion and a fourth feeding portion, the third feeding portion is disposed on the first layer, and the fourth feeding portion is disposed on the second layer.

4. The directional antenna as claimed in claim 2, wherein the first feeding portion and the second feeding portion have a second distance therebetween and do not overlap each other.

5. The directional antenna as claimed in claim 3, wherein the third feeding portion and the fourth feeding portion have a second distance therebetween and do not overlap each other.

6. The directional antenna of claim 1, wherein the first reflector, the first radiator, and the first directors are metal conductors printed on the substrate.

7. The directional antenna of claim 1, wherein the second reflector, the second radiator, and the plurality of second directors are metal conductors printed on the substrate.

8. The directional antenna of claim 1, wherein the first radiator is formed between the first reflector and the plurality of first directors.

9. The directional antenna of claim 1, wherein the second radiator is formed between the second reflector and the plurality of second directors.

10. The directional antenna as claimed in claim 1, wherein the substrate is provided with a plurality of through holes, and the plurality of through holes pass through the substrate.

Images