CN210040548U

CN210040548U - PCB antenna module

Info

Publication number: CN210040548U
Application number: CN201921084112.4U
Authority: CN
Inventors: 王道雨
Original assignee: Cambridge Industries Shanghai Co Ltd
Current assignee: CIG Shanghai Co Ltd; Cambridge Industries Shanghai Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-02-07
Anticipated expiration: 2029-07-11

Abstract

The utility model discloses a PCB antenna module, it includes PCB base plate, metal ground connection part and normal direction mould helical antenna, the PCB base plate has been seted up two rows of metal via holes, be limited with the antenna region between two rows of metal via holes, normal direction mould helical antenna comprises the multistage microstrip line that is located the upper and lower surface of PCB base plate, the multistage microstrip line connects gradually the metal via hole, thereby make normal direction mould helical antenna whole be constructed to connect gradually each metal via hole in two rows of metal via holes spirally, and around the antenna region; the PCB antenna module further comprises a matching short-circuit microstrip line, one end of the matching short-circuit microstrip line is connected to the feed end of the normal mode helical antenna, and the other end of the matching short-circuit microstrip line is connected to the metal grounding part, so that equivalent inductance is formed. According to the utility model discloses a PCB antenna module compares prior art and need not extra matching circuit, has saved overall arrangement space and manufacturing cost.

Description

PCB antenna module

Technical Field

The utility model relates to a PCB antenna module.

Background

The wireless communication equipment adopts the PCB antenna module, so that the production cost and time can be greatly reduced. The space occupied by a typical on-board antenna is still large. Meanwhile, in the existing PCB antenna module, the input impedance of the antenna is often low, and an additional matching circuit is required, which further causes additional layout space and production cost.

Therefore, a new PCB antenna module is needed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to take the great, the higher defect of manufacturing cost of overall arrangement space because of needing extra matching circuit in order to overcome current PCB antenna module, provide a new PCB antenna module.

The utility model discloses a solve above-mentioned technical problem through adopting following technical scheme:

the utility model provides a PCB antenna module, its characteristics are that it includes PCB base plate, metal ground connection part and normal direction mould helical antenna, PCB base plate has seted up two rows of through-holes, it has the antenna region to limit between two rows of through-holes, normal direction mould helical antenna is arranged to pass each through-hole in two rows of through-holes in proper order spirally, thereby make to be spiral normal direction mould helical antenna around the antenna region;

the PCB antenna module further comprises a matching short-circuit microstrip line, one end of the matching short-circuit microstrip line is connected to the feed end of the normal mode helical antenna, and the other end of the matching short-circuit microstrip line is connected to the metal grounding part, so that equivalent inductance is formed.

Preferably, the PCB antenna module further includes a metal plate, the PCB substrate is attached to a portion of the metal plate, and the other portion of the metal plate forms the metal ground portion.

Preferably, the matching short-circuit microstrip line includes a first extension section and a second extension section that are connected to each other and form an included angle, the first extension section extends from the feed end of the normal mode helical antenna to one end of the second extension section along a direction parallel to the central axis direction of the normal mode helical antenna, and the other end of the second extension section is connected to the metal ground portion.

Preferably, the normal mode helical antenna is configured as a zigbee or z-wave band communications antenna.

Preferably, the PCB substrate has a thickness of 0.7mm and a dielectric constant of 4.4.

The utility model also provides a PCB antenna module, its characteristics are that, it includes PCB base plate, metal ground connection part and normal direction mould helical antenna, the PCB base plate has seted up two rows of metal via holes, it has the antenna region to be restricted between two rows of metal via holes, normal direction mould helical antenna comprises the multistage microstrip line that is located the upper and lower surface of PCB base plate, multistage microstrip line connects gradually the metal via hole, thereby makes normal direction mould helical antenna whole be constructed to connect gradually each metal via hole in two rows of metal via holes spirally, and centers on the antenna region;

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in:

according to the utility model discloses a PCB antenna module utilizes the design of the matching short circuit microstrip line that normal mode helical antenna and antenna feed end are connected, can form equivalent inductance in order to improve input impedance's matching, therefore need not extra matching circuit, has saved overall arrangement space and manufacturing cost.

Drawings

Fig. 1 is a schematic diagram of a PCB antenna module according to a preferred embodiment of the present invention.

Fig. 2 is a diagram of a return loss simulation result of an application example of the PCB antenna module according to the preferred embodiment of the present invention.

Fig. 3 is a diagram showing simulation results of gain direction of an application example of the PCB antenna module according to the preferred embodiment of the present invention.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings, and the following description is exemplary and not intended to limit the present invention, and any other similar cases will fall within the scope of the present invention.

In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", and the like, are used with reference to the orientation as illustrated in the drawings. The components of the various embodiments of the present invention can be positioned in a number of different orientations and the directional terminology is used for purposes of illustration and is in no way limiting.

Referring to fig. 1, according to the utility model discloses preferred embodiment's PCB antenna module, it includes PCB base plate 3, metal ground part and normal direction mould helical antenna 1, PCB base plate 3 has seted up two rows of metal via holes, it has the antenna area to be injectd between two rows of metal via holes, normal direction mould helical antenna 1 comprises the multistage microstrip line that is located PCB base plate 3's upper and lower surface, the metal via hole is connected gradually to the multistage microstrip line, thereby make normal direction mould helical antenna 1 whole be constructed for being each metal via hole in two rows of metal via holes of connecting gradually with the heliciform, and around the antenna area.

The PCB antenna module further comprises a matching short-circuit microstrip line 2, one end of the matching short-circuit microstrip line 2 is connected to a feed end 5 of the normal mode helical antenna 1, and the other end of the matching short-circuit microstrip line is connected to the metal grounding part, so that equivalent inductance is formed. Thus, the matching of the input impedance can be improved by using the equivalent inductance effect without adopting an additional matching circuit. Moreover, it should be understood that according to different actual requirements, the input impedance of the antenna of the PCB antenna module can be matched to a required value by adjusting the position and size of the matching short-circuit microstrip line 2, so as to meet different antenna performance requirements. The design also has the advantages of small size, easy integration and convenient processing.

According to another alternative preferred embodiment of the present invention, the PCB antenna module is slightly different from the above-mentioned PCB antenna module in the PCB substrate 3 and the normal mode helical antenna 1 portion. Wherein, two rows of through-holes have been seted up to PCB base plate 3, are injectd between two rows of through-holes and have antenna region, and normal direction mould helical antenna 1 is arranged to be each through-hole in two rows of through-holes that passes in proper order for it centers on antenna region to be spiral-like normal direction mould helical antenna 1.

As shown in fig. 1, according to some preferred embodiments of the present invention, the PCB antenna module further includes a metal plate 4, the PCB substrate 3 is attached to a portion of the metal plate 4, and the other portion of the metal plate 4 forms a metal ground portion.

As shown in fig. 1, according to some preferred embodiments of the present invention, the matching short-circuit microstrip line 2 includes a first extension section and a second extension section connected to each other and forming an included angle, the first extension section extends from the feed terminal 5 of the normal mode helical antenna 1 to one end of the second extension section in a direction parallel to the central axis direction of the normal mode helical antenna 1, and the other end of the second extension section is connected to the metal ground. Based on this basic design, it is convenient to adjust the position and size of the matching short-circuited microstrip line 2 according to actual needs as before.

According to some preferred embodiments of the present invention, the PCB substrate 3 has a thickness of 0.7mm and a dielectric constant of 4.4, and may be made of FR-4 grade material.

According to some preferred embodiments of the present invention, the normal mode helical antenna 1 is configured as a communication antenna suitable for zigbee or z-wave frequency bands. The PCB normal mode helical antenna 1 applied to the zigbee/z-wave technology has an operating frequency of 868MHz or 915 MHz. For example, by adjusting the position and size of the matching short-circuit microstrip line 2, the input impedance of the PCB helical antenna can be matched to 50 Ω to meet the performance requirement of zigbee/z-wave, without an additional matching circuit, and the production cost and the layout space are reduced. Meanwhile, the antenna has the advantages of high antenna efficiency, small size, easy integration and convenient processing

To the simulation test that an application example according to the utility model discloses preferred embodiment's PCB antenna module goes on, the test result has also shown the utility model discloses the above-mentioned technical advantage that has.

The application example is a PCB antenna module resonating at 868MHz, which comprises a normal mode helical antenna 1 structured as above, the whole length of the antenna is about 25mm, the width is about 8.5mm, the microstrip line width of the antenna is about 1mm, the microstrip line distance is about 1mm, and the PCB antenna module further comprises a matching short circuit microstrip line 2 structured as above, the length is about 13.8mm, and the line width is about 1 mm.

The simulation test results of this application example are shown in fig. 2-3. The result of the return loss simulation of the application example is shown in fig. 2, and S11 is < -10dB in the working frequency band. Fig. 3 shows the simulation result of the gain pattern of the application example, which radiates a symmetric and good normal mode in the working frequency band.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments can be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications all fall within the scope of the present invention.

Claims

1. A PCB antenna module is characterized by comprising a PCB substrate, a metal grounding part and a normal mode spiral antenna, wherein the PCB substrate is provided with two rows of through holes, an antenna area is defined between the two rows of through holes, and the normal mode spiral antenna is arranged to spirally pass through each through hole in the two rows of through holes in sequence, so that the spiral normal mode spiral antenna surrounds the antenna area;

2. The PCB antenna module of claim 1, further comprising a metal plate, wherein the PCB substrate is attached to a portion of the metal plate, and another portion of the metal plate forms the metal ground.

3. The PCB antenna module of claim 1, wherein the matching short-circuited microstrip line includes a first extension section and a second extension section connected to each other at an angle, the first extension section extends from a feeding end of the normal mode helical antenna to one end of the second extension section in a direction parallel to a central axis direction of the normal mode helical antenna, and the other end of the second extension section is connected to the metal ground.

4. The PCB antenna module of claim 1, wherein the normal mode helical antenna is configured as a communication antenna adapted for zigbee or z-wave bands.

5. The PCB antenna module of claim 1, wherein the PCB substrate has a thickness of 0.7mm and a dielectric constant of 4.4.

6. A PCB antenna module is characterized by comprising a PCB substrate, a metal grounding part and a normal mode helical antenna, wherein the PCB substrate is provided with two rows of metal through holes, an antenna area is defined between the two rows of metal through holes, the normal mode helical antenna consists of a plurality of sections of microstrip lines positioned on the upper surface and the lower surface of the PCB substrate, and the plurality of sections of microstrip lines are sequentially connected with the metal through holes, so that the normal mode helical antenna is integrally constructed to be sequentially connected with each metal through hole in the two rows of metal through holes in a spiral shape and surround the antenna area;

7. The PCB antenna module of claim 6, further comprising a metal plate, wherein the PCB substrate is attached to a portion of the metal plate, and another portion of the metal plate forms the metal ground.

8. The PCB antenna module of claim 6, wherein the matching short-circuited microstrip line comprises a first extension section and a second extension section connected to each other at an angle, the first extension section extends from a feeding end of the normal mode helical antenna to one end of the second extension section in a direction parallel to a central axis direction of the normal mode helical antenna, and the other end of the second extension section is connected to the metal ground.

9. The PCB antenna module of claim 6, wherein the normal mode helical antenna is configured as a communication antenna adapted for zigbee or z-wave bands.

10. The PCB antenna module of claim 6, wherein the PCB substrate has a thickness of 0.7mm and a dielectric constant of 4.4.