TWI412174B - Wireless communication device - Google Patents

Abstract

A wireless communication device is provided. The wireless communication device includes a system ground plane and an antenna body. The system ground plane includes a first ground point, a second ground point and a feed point. The feed point locates on a virtual centerline between the first ground point and the second ground point. The antenna body is electrically connected to the first ground point, the second ground point and the feed point. Thereby, a radiation pattern of the wireless communication device can be improved.

Description

Wireless communication device

The present invention relates to a wireless communication device, and more particularly to a structural design of a grounding point and a feeding point in a wireless communication device.

The traditional Global Positioning System (GPS) antenna mainly uses a patch antenna to achieve a broad-side radiation pattern (Broadside Radiation Pattern). Even the Radiator is changed to adjust the polarization characteristics. However, since the space required for the flat panel antenna cannot be applied to the miniaturized communication product, the Planer Inverted-F Antenna (PIFA) is generally used to reduce the size occupied by the antenna.

The PIFA consists of a feed point and a ground point. Its good radiation characteristics can also effectively receive GPS signals. It is also possible to use a symmetrical loop antenna (Loop Antenna). The symmetrical antenna architecture can improve the PIFA's vulnerability to external environments and system ground planes. For example, there are audio jacks (Audio Jack), speakers (Speaker) and Shielding Box (.). . However, the symmetrical structure of the loop antenna is also required to be too large in size and is limited in application.

In the prior art, the PIFA uses only one feed point and one ground point, which will cause the radiation pattern of the antenna to be affected by surrounding objects, thereby limiting the distribution of the radiation pattern. Furthermore, in some prior art, when the antenna itself cannot achieve 50 ohm impedance matching, the matching circuit mechanism is used to achieve matching, but sometimes the matching circuit cannot achieve true 50 ohm impedance matching, which will cause radiation. Energy cannot be effectively transmitted and the difficulty of the overall design of the antenna is increased.

The invention provides a wireless communication device which can improve the radiation pattern of an antenna.

The invention provides a wireless communication device comprising a system ground plane and an antenna body. The system ground plane includes a first ground point, a second ground point, and a feed point. The feed point is located on a virtual centerline between the first ground point and the second ground point. The antenna body is electrically connected to the first grounding point, the second grounding point, and the feeding point.

In an embodiment of the invention, the wireless communication device further includes a global positioning system chipset. The GPS chipset is electrically connected to the feed point.

In an embodiment of the present invention, the first location point, the second location point, and the third location point of the antenna body are electrically connected to the first ground point, the second ground point, and the feed point, respectively, and the third location point is located Between the first location point and the second location point.

In an embodiment of the invention, the distance between the first location point and the third location point may be the same as or different from the distance between the second location point and the third location point.

In an embodiment of the invention, the wireless communication device further includes a first conductive material to a third conductive material. The first conductive material is electrically connected between the first ground point and the first position point. The second conductive material is electrically connected between the second ground point and the second position point. The third conductive material is electrically connected between the feed point and the third position point. The first conductive material is the same length as the second conductive material.

In an embodiment of the invention, the distance from the feed point to the first ground point and the second ground point is between 1 mm and 10 mm, respectively.

In an embodiment of the invention, the feed point, the first ground point and the second ground point are located on a virtual straight line of the system ground plane. In another embodiment, the feed point, the first ground point, and the second ground point are respectively located at three end points of the virtual isosceles triangle of the system ground plane, and the first ground point and the second ground point are respectively virtual The two ends of the base of the isosceles triangle.

Based on the above, the present invention places the feed point in the system ground plane on the virtual center line between the first ground point and the second ground point. In this way, the radiation pattern of the antenna can be effectively improved.

The above described features and advantages of the invention will be apparent from the following description.

The conventional PIFA uses only one feed point and one ground point, and its radiation field is not good. In view of this, the system ground plane of the embodiment of the present invention includes a first ground point, a second ground point, and a feed point. The feed point is located on a virtual center line between the first ground point and the second ground point and has a specific positional relationship with each other. The antenna body is electrically connected to the first grounding point, the second grounding point, and the feeding point. Therefore, the radiation field type of the antenna can be effectively improved, especially for GPS transmission and reception signals. The embodiments of the present invention are explained in detail below with reference to the accompanying drawings, in which FIG.

First embodiment

1A is a schematic diagram of a wireless communication device according to a first embodiment of the present invention, which may include a smart phone, a PDA, a GPS device, a Smartbook, a Netbook, a Notebook, a UMPC, etc., as long as it is available for receiving and receiving GPS signals. The device can be one of the embodiments. Referring to FIG. 1A, in the embodiment, the wireless communication device 10 is described by taking a mobile phone as an example, mainly for improving the radiation field of the GPS signal in the device, so as to have a faster positioning and Better communication quality. The wireless communication device 10 can include a system ground plane 30 and an antenna body 20. System ground plane 30 can be, for example, the plane of a printed circuit board. The antenna body 20 can be disposed, for example, on a substrate. In this embodiment, the system ground plane 30 and the antenna body 20 are not in the same plane. System ground plane 30 may include ground points G1, G2 and feed point F1.

It is worth mentioning that the feed point F1 is located on the virtual center line CL1 between the ground points G1 and G2, in other words, any point on the virtual center line CL1 is equidistant from the ground points G1 and G2. The feed point F1 can be electrically connected to a chipset (not shown) of the global positioning system. The antenna body 20 is electrically connected to the grounding points G1 and G2 and the feeding point F1. More specifically, in the present embodiment, the ground point G1 is a position point P1 electrically connected to the antenna body 20 through the conductive material C1. The grounding point G2 is a position point P2 electrically connected to the antenna body 20 through the conductive material C2. The feed point F1 is a position point P3 electrically connected to the antenna body 20 through the conductive material C3. The length of the conductive material C1 is equal to the length of the conductive material C2, and the conductive material may be a metal spring (Spring), a thimble (Pogo Pin) or other electrically conductive wire, and the purpose is to make the antenna body 20 and the grounding point G1. G2 is electrically connected to each other. The distance between the feed point F1 and the ground point G1, G2 is, for example, between 1 mm and 10 mm, respectively, but the invention is not limited thereto. In other embodiments, those skilled in the art can also change the distance from the feed point F1 to the ground points G1, G2 according to their needs.

Figure 1B is a schematic illustration of the radiation pattern of an antenna of Figure 1A.

Referring to FIG. 1A, FIG. 1B and Table 1 together, for the wireless communication device 10, the larger the radiation field type, the better the communication quality. In other words, the larger the value of Power (dBm) in Table 1 (in terms of mathematics, for example: -1>-4>-7>-10), the better the communication quality. The antenna body 20 of the present embodiment is electrically connected to the feed point F1 and the ground points G1 and G2, and the feed point F1 is located on the virtual center line CL1 between the ground points G1 and G2. This method can make the angle of the radiation field type appear no obvious weak zone (Null). The so-called weak zone is the poor gain (Gain) value of the antenna body 20 at a certain angle in a certain direction. In this embodiment, according to stricter standards, when the value of Power (dBm) is lower than -8 (the industry generally uses -12 as the standard), it is regarded as a weak zone.

In Table 1, the worst value of the gain in each angle is at θ angle 90 and ψ angle 240, but the gain value also has -7.4 and does not form a weak zone. Therefore, the wireless communication device 10 of the present embodiment can receive the satellite signal at various angles in practical applications, and the problem that the satellite signal is not received at a partial angle is not easy.

Relatively speaking, if the antenna body is electrically connected only to a feed point and a ground point, the radiation field will form a weak zone. For example, FIG. 2A is a schematic diagram of another wireless communication device in accordance with a first embodiment of the present invention. 2B is a schematic illustration of the radiation pattern of an antenna of FIG. 2A.

Referring to FIG. 1A, FIG. 2A, FIG. 2B and Table 2 together, the wireless communication device 11 is similar to the wireless communication device 10. The difference is that the wireless communication device 11 omits the conductive material C2 and the ground point G2 of the wireless communication device 10. It is worth noting that this method causes the radiation pattern to form a weak zone, such as θ angle 45 and ψ angle 60 and 75 (as shown in the bottom of Table 2). It can be seen that the wireless communication device 10 of FIG. 1A can effectively improve the radiation pattern.

For another example, FIG. 3A is a schematic diagram of still another wireless communication device in accordance with a first embodiment of the present invention. Figure 3B is a schematic illustration of the radiation pattern of an antenna of Figure 3A.

Referring to FIG. 1A, FIG. 3A, FIG. 3B and Table 3 together, the wireless communication device 12 is similar to the wireless communication device 10. The difference is that the wireless communication device 12 omits the conductive material C1 and the ground point G1 of the wireless communication device 10. It is worth noting that this method causes the radiation pattern to form a weak zone, such as θ angle 45, ψ angle 60, and θ angle 90, ψ angle 225 (as shown in the bottom of Table 3). It can be seen that the wireless communication device 10 of FIG. 1A can effectively improve the radiation pattern.

Comparing Fig. 2A, Fig. 2B, and Fig. 2 with Fig. 3A, Fig. 3B, and Table 3, we can clearly see that in Fig. 2B, there is an obvious weak zone in the field distribution of the antenna. The function of the grounding point G2 in this antenna is mainly to achieve impedance matching of 50 ohms; but in Figure 3B, we find that the radiation pattern of the whole antenna has changed, and two obvious weak sensing areas have appeared, so the grounding point The function of G1 can not only fine-tune the impedance matching of 50 ohms, but also mainly affect the main cause of radiation field distribution.

Although a possible form has been delineated for the wireless communication device in the above embodiments, those skilled in the art should know that the design of the wireless communication device is different for each manufacturer, and therefore the application of the present invention is not Limited to this possible type. In other words, as long as the feed point in the system ground plane is disposed on the virtual center line between the first ground point and the second ground point, it is in line with the spirit of the present invention. The following examples are presented to enable those of ordinary skill in the art to understand the invention and practice the invention.

Second embodiment

In the embodiment of FIG. 1A, the feed point F1 and the ground points G1 and G2 of the system ground plane 30 are disposed on the same virtual line, but they are only an alternative embodiment, and the invention is not limited thereto. In other embodiments, those skilled in the art can also change the configuration positions of the feeding point F1 and the grounding points G1 and G2 according to their needs. For example, FIG. 4A is a schematic diagram of a wireless communication device according to a second embodiment of the present invention, wherein the length of the conductive material C1 is equal to the length of the conductive material C2, and the lengths of the conductive materials C1 and C2 are greater than that of the conductive material C3. length. In addition, on the system ground plane, the feed point F1, the ground points G1 and G2 are arranged on three end points of a virtual isosceles triangle, and the ground points G1 and G2 are the bottom sides of the virtual isosceles triangle. End points. 4B is a schematic illustration of the radiation pattern of an antenna of FIG. 4A.

Referring to FIG. 1A, FIG. 4A, FIG. 4B and Table four together, the wireless communication device 13 is similar to the wireless communication device 10. The difference is that the feeding point F1 of the system ground plane 30 in the wireless communication device 13 and the grounding points G1 and G2 are not on the same line, but the feeding point F1 is still located at the virtual center line CL1 between the grounding points G1 and G2. on. It is worth noting that the radiation field of Figure 4B also has no obvious weak zone. In other words, the wireless communication device 13 can achieve similar effects as the wireless communication device 10.

Third embodiment

For another example, FIG. 5A is a schematic diagram of a wireless communication device according to a third embodiment of the present invention, wherein the length of the conductive material C1 is equal to the length of the conductive material C2, and the lengths of the conductive materials C1 and C2 are both smaller than the length of the conductive material C3. . In addition, on the system ground plane, the feed point F1, the ground points G1 and G2 are arranged on three end points of a virtual isosceles triangle, and the ground points G1 and G2 are the bottom sides of the virtual isosceles triangle. Two endpoints. Figure 5B is a schematic illustration of the radiation pattern of an antenna of Figure 5A.

Referring to FIG. 1A, FIG. 5A, FIG. 5B and Table 5 together, the wireless communication device 14 is similar to the wireless communication device 10. The difference is that the feeding point F1 of the system ground plane 30 in the wireless communication device 14 is not on the same line as the ground points G1 and G2, but the feeding point F1 is still located at the virtual center line CL1 between the ground points G1 and G2. on. It is worth noting that the radiation field of Figure 5B also has no obvious weak zone. In other words, the wireless communication device 14 can achieve similar efficacy as the wireless communication device 10.

Fourth embodiment

In the embodiment of Figure 1A, the distance from the feed point F1 to the ground points G1, G2 is only an alternative embodiment. Those skilled in the art can also change the distance from the feed point F1 to the ground points G1, G2 according to their needs. For example, FIG. 6A is a schematic diagram of a wireless communication device according to a fourth embodiment of the present invention, and the feeding point F1 and the grounding points G1 and G2 are disposed on the same virtual straight line, wherein the length of the conductive material C1 is equal to the length of the conductive material C2. And the lengths of the conductive materials C1 and C2 are both greater than the length of the conductive material C3. Figure 6B is a schematic illustration of the radiation pattern of an antenna of Figure 6A.

Referring to FIG. 1A, FIG. 6A, FIG. 6B and Table 6, the wireless communication device 15 is similar to the wireless communication device 10. The difference is the distance from the feed point F1 to the ground points G1, G2. It is worth noting that the radiation field of Figure 6B also has no obvious weak zone. In other words, the wireless communication device 15 can achieve similar effects as the wireless communication device 10.

Fifth embodiment

In the embodiment of FIG. 1A, the positions of the grounding points G1, G2 and their virtual centerline CL1 and the lengths of the conductive materials C1, C2 and C3 are only an alternative embodiment, and the invention is not limited thereto. Those skilled in the art can also change the positions of the ground points G1, G2 and their virtual center line CL1 and the lengths of the conductive materials C1, C2 and C3 according to their needs. For example, FIG. 7 is a schematic diagram of a wireless communication device in accordance with a fifth embodiment of the present invention. Referring to FIG. 1A and FIG. 7, the wireless communication device 16 is similar to the wireless communication device 10. The difference is that the lengths of the conductive materials C1, C2 and C3 of the wireless communication device 16 are not the same, wherein the length of the conductive material C1 is greater than the length of the conductive material C3, and the length of the conductive material C3 is greater than the length of the conductive material C2. In addition, the positions of the ground points G1, G2 of the wireless communication device 16 and their virtual center line CL2 are also different from those of the wireless communication device 15. It is worth noting that in the wireless communication device 16, the feed point F1 is still located on the virtual center line CL2 between the ground points G1 and G2. As a result, the wireless communication device 16 can also achieve similar effects as the wireless communication device 10.

Sixth embodiment

For another example, FIG. 8 is a schematic diagram of a wireless communication device in accordance with a sixth embodiment of the present invention. Referring to FIG. 1A and FIG. 8, the wireless communication device 17 is similar to the wireless communication device 10. The difference is the length of the conductive materials C1, C2 and C3 of the wireless communication device 17 and the positions of the ground points G1, G2 and their virtual center line CL3. It is worth noting that in the wireless communication device 17, the feed point F1 is still located on the virtual center line CL3 between the ground points G1 and G2. As a result, the wireless communication device 17 can also achieve similar effects as the wireless communication device 10.

Seventh embodiment

Those skilled in the art can also change the arrangement of the conductive materials according to their needs, so that the lengths of the conductive materials are uniform. 9 is a schematic diagram of a wireless communication device in accordance with a seventh embodiment of the present invention. Referring to FIG. 8 and FIG. 9, the wireless communication device 18 is similar to the wireless communication device 17. The difference is that the wireless communication device 18 configures the conductive material C2 in a meandering manner, so that the lengths of the conductive materials C1 and C2 are the same, and the length of the conductive material C1 and the length of the conductive material C2 are both greater than the length of the conductive material C3. As a result, the wireless communication device 18 can also achieve similar effects as the wireless communication device 17.

Eighth embodiment

In the embodiment of FIG. 1A, the positions of the position points P1 to P3 and the spacing thereof are only an alternative embodiment, and the invention is not limited thereto. Those skilled in the art can also change the position and spacing of the position points P1 to P3 according to their needs. For example, FIG. 10 is a schematic diagram of a wireless communication device in accordance with an eighth embodiment of the present invention. Referring to FIG. 1A and FIG. 10 together, the wireless communication device 19 is similar to the wireless communication device 10. The difference is the position of the position points P1 to P3 of the wireless communication device 19 and the pitch thereof. In this embodiment, the impedance matching situation of the antenna body 20 can be improved by changing the positions of the position points P1 to P3 and their pitches. In other words, the distance between the position points P1, P3 and the distance between the position points P2, P3 may depend on the impedance matching situation of the antenna body 20. In this way, the wireless communication device 19 can not only achieve similar effects as the wireless communication device 10, but also improve the impedance matching problem of the antenna body 20.

In other words, embodiments of the present invention can effectively improve the receiving effect of the GPS antenna. When the GPS antenna itself cannot achieve 50 ohm (Ω) impedance matching and a weak zone occurs in the radiation pattern, the embodiment of the present invention can adjust two ground points without changing the radiation body and the matching circuit. Relative to the position of the feed point, the defect of the conventional PIFA antenna susceptible to environmental influences on its radiation pattern can be improved without changing the radiation body and the matching circuit.

In summary, in the wireless communication device of the present invention, the feed point in the system ground plane is disposed on the virtual center line between the first ground point and the second ground point, thereby effectively improving the radiation pattern of the antenna. In addition, the embodiment of the present invention can improve the impedance matching problem of the antenna body by changing the position points at which the first grounding point, the second grounding point, and the feeding point are respectively connected to the antenna body.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and those skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10~19. . . Wireless communication device

20. . . Antenna body

30. . . System ground plane

P1 ~ P3. . . Location point

C1～C3. . . Conductive material

G1, G2. . . Grounding point

F1. . . Feeding point

CL1～CL3. . . Virtual centerline

X, Y, Z. . . Coordinate axis

θ, ψ. . . angle

1A is a schematic diagram of a wireless communication device in accordance with a first embodiment of the present invention.

Figure 1B is a schematic illustration of the radiation pattern of an antenna of Figure 1A.

2A is a schematic diagram of another wireless communication device in accordance with a first embodiment of the present invention.

2B is a schematic illustration of the radiation pattern of an antenna of FIG. 2A.

3A is a schematic diagram of still another wireless communication device in accordance with a first embodiment of the present invention.

Figure 3B is a schematic illustration of the radiation pattern of an antenna of Figure 3A.

4A is a schematic diagram of a wireless communication device in accordance with a second embodiment of the present invention.

4B is a schematic illustration of the radiation pattern of an antenna of FIG. 4A.

Figure 5A is a schematic diagram of a wireless communication device in accordance with a third embodiment of the present invention.

Figure 5B is a schematic illustration of the radiation pattern of an antenna of Figure 5A.

Figure 6A is a schematic diagram of a wireless communication device in accordance with a fourth embodiment of the present invention.

Figure 6B is a schematic illustration of the radiation pattern of an antenna of Figure 6A.

Figure 7 is a schematic diagram of a wireless communication device in accordance with a fifth embodiment of the present invention.

FIG. 8 is a schematic diagram of a wireless communication device in accordance with a sixth embodiment of the present invention.

9 is a schematic diagram of a wireless communication device in accordance with a seventh embodiment of the present invention.

Figure 10 is a schematic diagram of a wireless communication device in accordance with an eighth embodiment of the present invention.

10. . . Wireless communication device

20. . . Antenna body

30. . . System ground plane

P1 ~ P3. . . Location point

C1～C3. . . Conductive material

G1, G2. . . Grounding point

F1. . . Feeding point

CL1. . . Virtual centerline

Claims (10)

A wireless communication device includes: a system ground plane, including: a first ground point; a second ground point; and a feed point located in a virtual space between the first ground point and the second ground point And an antenna body electrically connected to the first grounding point, the second grounding point and the feeding point, wherein the antenna body is a planar inverted F-type antenna. The wireless communication device of claim 1, further comprising: a global positioning system chip set electrically connected to the feed point. The wireless communication device of claim 1, wherein a first position point, a second position point and a third position point of the antenna body are electrically connected to the first ground point and the second connection, respectively. a location and the feed point, and the third location point is between the first location point and the second location point. The wireless communication device of claim 3, wherein the distance between the first location point and the third location point is the same as the distance between the second location point and the third location point. The wireless communication device of claim 3, wherein a distance between the first location point and the third location point is different from a distance between the second location point and the third location point. The wireless communication device of claim 3, wherein a distance between the first location point and the second location point and a distance between the second location point and the third location point are based on the antenna The impedance matching of the body depends on the situation. The wireless communication device of claim 3, further comprising: a first conductive material electrically connected between the first ground point and the first position; and a second conductive material electrically connected Between the second ground point and the second position; and a third conductive material electrically connected between the feed point and the third position, wherein the first conductive material and the second conductive The length of the material is the same. The wireless communication device of claim 1, wherein the distance from the feed point to the first ground point and the second ground point is between 1 mm and 10 mm, respectively. The wireless communication device of claim 1, wherein the feed point, the first ground point and the second ground point are located on a virtual straight line of the ground plane of the system. The wireless communication device of claim 1, wherein the feed point, the first ground point and the second ground point are respectively located at three end points of a virtual isosceles triangle of the system ground plane, And the first grounding point and the second grounding point are respectively two end points of a bottom side of the virtual isosceles triangle.