CN202363583U - Antenna module - Google Patents

Abstract

An antenna module includes a substrate, a main radiation structure, a long and narrow radiation structure, a ground structure, a short-circuit structure, a parasitic radiation structure and a metal radiator. The main radiation structure, the long and narrow radiation structure, the ground structure, the short circuit structure and the parasitic radiation structure are all formed on the substrate. A first side of the main radiation structure forms an acute angle with a long side of the substrate, and the main radiation structure has a signal feed point and a connection point. The long and narrow radiating structure extends from a second side of the main radiating structure. The short-circuit structure is U-shaped, a first end of the short-circuit structure is connected to the signal feed point, and a second end of the short-circuit structure is connected to the ground structure. The parasitic radiation structure extends from the ground structure, and the parasitic radiation structure is parallel to the first side and spaced at a fixed distance. Metal radiators are connected to the connection points. In addition to maintaining and fine-tuning the high-frequency bandwidth, the utility model can also additionally match the GPS/GLONASS frequency band with the long and narrow radiation structure.

Description

antenna module

technical field

The utility model relates to an antenna module, in particular to an antenna module capable of generating three operating frequency bands.

Background technique

With the widespread application of portable electronic devices, the demand for wireless transmission is also increasing. This demand includes not only the improvement of the transmission quality of the device, but also the improvement of the ability of the device to use multiple communication standards. In order to apply different communication standards, traditionally, independent antennas are used to implement communication. In order to prevent the antennas from interfering with each other, these antennas should be separated as much as possible in practice. This design method is feasible in relatively large devices, but it is difficult to implement in smaller devices (such as mobile phones). Under the trend of multi-mode communication and device miniaturization, composite antennas have also begun to develop. However, it is still difficult to overcome the isolation of the compound antenna at present, and most of the compound antennas are still formed or provided with multiple antennas on the same substrate, so the installation space required by the compound antenna is still difficult to reduce.

Utility model content

Therefore, one of the objectives of the present invention is to provide an antenna module capable of generating three operating frequency bands, so as to solve the above problems.

According to an embodiment, the antenna module of the present invention includes a substrate, a main radiation structure, a long and narrow radiation structure, a ground structure, a short circuit structure, a parasitic radiation structure and a metal radiator. The main radiation structure is formed on the substrate. A first side of the main radiation structure forms an acute angle with a long side of the substrate. The main radiation structure has a signal feeding point and a connection point. The elongated radiating structure is formed on the substrate and extends from a second side of the main radiating structure. The ground structure is formed on the substrate. The short circuit structure is formed on the substrate, the short circuit structure is U-shaped, a first end of the short circuit structure is connected to the signal feeding point, and a second end of the short circuit structure is connected to the ground structure. The parasitic radiation structure is formed on the substrate and extends from the ground structure. The parasitic radiation structure is parallel to the first side and separated by a fixed distance. The metal radiator is connected to the connection point.

To sum up, the low-frequency part of the antenna module of the present invention is controlled by the short-circuit structure. Through the U-shaped short-circuit structure, in addition to maintaining and fine-tuning the high-frequency bandwidth, it can also be combined with the narrow and long radiation structure for additional Match the frequency band of GPS/GLONASS. In addition, since the parasitic radiation structure is separated from the first side of the main radiation structure by a fixed distance and does not touch each other, the antenna module of the present invention can generate electromagnetic coupling effects through the interaction between the two, and can be used to adjust the high-frequency part Matching, so that the antenna module can generate three operating frequency bands, including LTE700/GSM850/GSM900 (bandwidth of about 698-960MHz), GPS/GLONASS (bandwidth of about 1570-1610MHz) and GSM1800/GSM1900/UMTS/LTE2300/LTE2500 .

The advantages and spirit of the present utility model can be further understood through the following detailed description of the utility model and the accompanying drawings.

Description of drawings

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

FIG. 2 is an exploded view of the antenna module in FIG. 1;

Fig. 3 is a radiation efficiency diagram of the antenna module in Fig. 1;

Fig. 4 is a relationship diagram between return loss and frequency measured at different positions of the grounding structure when the second end of the short-circuit structure is connected;

Figure 5 is a graph showing the relationship between the return loss and the frequency measured by the parasitic radiation structure with different fixed distances;

Figure 6 is a plot of return loss versus frequency measured with different acute angles of the parasitic radiation structure.

Figure number:

1 Antenna Module 10 Substrate

12 main radiation structure 14 long and narrow radiation structure

16 Grounding structure 18 Short circuit structure

20 Parasitic radiation structure 22 Metal radiator

24 metal stickers 100 long sides

102, 104, connection point 120 first side

106, 124

122 Signal feed-in point 126 Second side

180 First end 182 Second end

α acute angle d fixed distance

W width

Detailed ways

Please refer to Figures 1 to 3, Figure 1 is a schematic diagram of an antenna module 1 according to an embodiment of the present invention, Figure 2 is an exploded view of the antenna module 1 in Figure 1, and Figure 3 is a diagram of the antenna module 1 in Figure 1 Radiation Efficiency Diagram. As shown in Figures 1 and 2, the antenna module 1 includes a substrate 10, a main radiation structure 12, a long and narrow radiation structure 14, a grounding structure 16, a short circuit structure 18, a parasitic radiation structure 20, and a metal radiator 22 And a metal sticker 24 . In practical applications, the substrate 10 can be a circuit board. The main radiating structure 12 , the elongated radiating structure 14 , the grounding structure 16 , the short circuit structure 18 and the parasitic radiating structure 20 are all formed on the substrate 10 . In practical application, the main radiating structure 12 , the long and narrow radiating structure 14 , the grounding structure 16 , the short circuit structure 18 and the parasitic radiating structure 20 can be formed on the substrate 10 by printing process.

A first side 120 of the main radiation structure 12 forms an acute angle α with a long side 100 of the substrate 10 . The main radiation structure 12 has a signal feeding point 122 and a connection point 124 . The elongated radiating structure 14 extends from a second side 126 of the main radiating structure 12 . The short circuit structure 18 is U-shaped. A first end 180 of the short circuit structure 18 is connected to the signal feeding point 122 , and a second end 182 of the short circuit structure 18 is connected to the ground structure 16 . The parasitic radiation structure 20 extends from the ground structure 16 , and the parasitic radiation structure 20 is parallel to the first side 120 of the main radiation structure 12 and separated by a fixed distance d. Therefore, the parasitic radiation structure 20 also forms an acute angle α with the long side 100 of the substrate 10 . The metal radiator 22 is connected to the connection point 124 of the main radiation structure 12 and other connection points 102 , 104 , 106 on the substrate 10 . In practical applications, the metal radiator 22 can be connected to the connection point 124 of the main radiation structure 12 and other connection points 102 , 104 , 106 on the substrate 10 through a welding process. In this embodiment, the metal radiator 22 is perpendicular to the substrate 10 , and the width W of the metal radiator 22 is greater than 4 mm. Thereby, better antenna radiation efficiency can be obtained. In addition, the metal sticker 24 is connected to the grounding structure 16 to assist the grounding performance of the antenna module 1 and the product.

As shown in Figure 2, unlike the short-circuit connection point of the general PIFA and IFA short-circuit structures and the signal feed-in point, the ground point of the short-circuit structure 18 (that is, connected to the second end 182 of the ground structure 16) is very close to The signal is fed into point 122 . In addition, the short-circuit structure 18 is designed in a slender and bent U-shape to match the three required operating frequency bands for the antenna module 1, including LTE700/GSM850/GSM900 (bandwidth about 698-960MHz), GPS/GLONASS ( The bandwidth is about 1570~1610MHz) and GSM1800/GSM1900/UMTS/LTE2300/LTE2500, as shown in Figure 3. In this embodiment, the low-frequency portion of the antenna module 1 is controlled by the short-circuit structure 18. Through the short-circuit structure 18 bent into a U shape, in addition to maintaining and fine-tuning the bandwidth of high frequencies, it can also be connected with the long and narrow radiation structure 14 Additional GPS/GLONASS frequency band matching.

Please refer to FIG. 4 . FIG. 4 is a graph showing the relationship between return loss and frequency measured at different locations where the second end 182 of the short circuit structure 18 is connected to the ground structure 16 . Assuming that the total length of the short-circuit structure 18 of the present invention is about 21.5 millimeters, and maintaining this length, the second end 182 of the short-circuit structure 18 is not shifted (that is, the position shown in FIG. 2 ), moved to the right by 5 millimeters and rightward by 9 millimeters , wherein when the second end 182 of the short-circuit structure 18 moves to the right by 9 mm, the short-circuit structure 18 is straightened from a U-shape to an L-shape. As shown in Figure 4, after losing the impedance matching of the U-shaped structure, the three frequency bands of the antenna module 1 deteriorate, especially the GPS/GLONASS part, because the impedance matching of the original bending part of the short-circuit structure 18 is lost, so it cannot be effectively matched. out of the GPS/GLONASS frequency band. In this embodiment, the distance between the second end 182 of the short-circuit structure 18 and the signal feeding point 122 can be finely adjusted between 1 mm and 5 mm to obtain better antenna radiation efficiency.

The parasitic radiation structure 20 is responsible for matching high frequencies. During design, the parasitic radiation structure 20 can be extended or shortened as required to adjust the high frequency part of the antenna module 1, or the fixed distance d between the parasitic radiation structure 20 and the main radiation structure 12 and / or acute angle α to control high frequency impedance. Please refer to FIG. 5 and FIG. 6. FIG. 5 is a graph showing the relationship between the return loss and frequency measured by the parasitic radiating structure 20 with different fixed distances d. FIG. 6 is the measured return of the parasitic radiating structure 20 with different acute angles α. Plot of loss versus frequency. As shown in Figure 5, when the fixed distance d is 0.5 mm, the high frequency matching is better. When the fixed distance d is increased, the high-frequency part will be separated from the parasitic radiation structure 20, resulting in poor matching. As shown in FIG. 6 , from the perspective of the bending angle of the parasitic radiation structure 20 , it is best to set the acute angle α to about 42 degrees. When the parasitic radiation structure 20 rotates 10 degrees clockwise or counterclockwise, the high frequency of the antenna module 1 will be deteriorated due to the change of the angle. In this embodiment, the acute angle α can be fine-tuned between 40 degrees and 44 degrees, and the fixed distance d can be fine-tuned between 0.5 mm and 1.5 mm to obtain better antenna radiation efficiency.

Compared with the prior art, the low-frequency part of the antenna module of the present invention is controlled by the short-circuit structure. Through the U-shaped short-circuit structure, in addition to maintaining and fine-tuning the high-frequency bandwidth, it can also be connected with the narrow and long radiation. The structure additionally matches the frequency band of GPS/GLONASS. In addition, since the parasitic radiation structure is separated from the first side of the main radiation structure by a fixed distance and does not touch each other, the antenna module of the present invention can generate electromagnetic coupling effects through the interaction between the two, and can be used to adjust the high-frequency part Matching, so that the antenna module can generate three operating frequency bands, including LTE700/GSM850/GSM900 (bandwidth of about 698-960MHz), GPS/GLONASS (bandwidth of about 1570-1610MHz) and GSM1800/GSM1900/UMTS/LTE2300/LTE2500 .

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the claims of the present utility model shall fall within the scope of the present utility model.

Claims (8)

1. An antenna module, characterized in that, the antenna module comprises: a substrate; A main radiation structure formed on the substrate, a first side of the main radiation structure forms an acute angle with a long side of the substrate, the main radiation structure has a signal feeding point and a connection point ; a long and narrow radiating structure formed on the substrate and extending from a second side of the main radiating structure; a ground structure formed on the substrate; A short-circuit structure formed on the substrate, the short-circuit structure is U-shaped, a first end of the short-circuit structure is connected to the signal feeding point, and a second end of the short-circuit structure is connected to the grounding structure; a parasitic radiation structure formed on the substrate and extending from the ground structure, the parasitic radiation structure is parallel to the first side and separated by a fixed distance; and A metal radiator is connected to the connecting point. 2. The antenna module according to claim 1, wherein the acute angle is between 40 degrees and 44 degrees. 3. The antenna module according to claim 1, wherein the long and narrow radiation structure is used to match the frequency band of GPS/GLONASS. 4. The antenna module according to claim 1, wherein the distance between the second end and the signal feeding point is between 1 mm and 5 mm. 5. The antenna module as claimed in claim 1, wherein the fixed distance is between 0.5 mm and 1.5 mm. 6. The antenna module according to claim 1, wherein the metal radiator is perpendicular to the substrate. 7. The antenna module according to claim 1, wherein the metal radiator has a width greater than 4 mm. 8. The antenna module according to claim 1, further comprising a metal sticker connected to the ground structure.

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