TW201731167A - Antenna structure and wireless communication device with same - Google Patents

Abstract

The invention relates to an antenna structure including a radiating body. The radiating body forms a polarization in a first direction and makes a radiating energy to focus in a first hemisphere pattern. The antenna structure further includes a stub antenna. One end of the stub antenna is grounded and another end of the stub antenna is spaced from the radiating body. The radiating body and the stub antenna cooperatively form a polarization in a second direction perpendicular to the first direction and make a radiating energy to focus in a second hemisphere pattern. The first hemisphere pattern and the second hemisphere pattern cooperatively form a radiating pattern of the antenna structure.

Description

Antenna structure and wireless communication device having the same

The invention relates to an antenna structure and a wireless communication device having the same.

With the advancement of wireless communication technology, wireless communication devices continue to develop toward a thin and light trend, and consumers are increasingly demanding the appearance and performance of wireless communication devices. Most wireless communication devices currently have a Global Positioning System (GPS) function to assist drivers in understanding road conditions, location, direction, speed, and the like. In terms of antenna design, the GPS antenna is usually designed at the top of the wireless communication device, so that the strongest energy of the antenna is mainly concentrated in the lower half of the stadium type, thereby affecting the transmission and reception performance of the antenna.

In view of this, it is necessary to provide an antenna structure that can effectively improve the transmission and reception performance of the antenna.

In addition, it is also necessary to provide a wireless communication device having the antenna structure.

An antenna structure includes a radiator that causes polarization in a first direction and concentrates radiant energy of the antenna structure on a first dome type, the antenna structure further including a stub antenna, the stub One end of the antenna is grounded, and the other end is spaced apart from the radiator, and the radiator plus the residual antenna causes polarization in the second direction and concentrates the radiation energy of the antenna structure on the second half-court type. Wherein the first direction is perpendicular to the second direction, and the first half court type and the second half court type form a radiation pattern of the antenna structure.

A wireless communication device comprising the antenna structure described in the above item.

The antenna structure and the wireless communication device having the antenna structure change the direction of the ground current of the antenna structure by setting the residual antenna, thereby changing the polarization direction thereof, and finally improving the hemispherical radiation pattern on the antenna structure. The radiant energy of the antenna structure is mainly concentrated in the upper hemisphere, so as to effectively improve the transceiving performance of the antenna structure.

1 is a schematic structural diagram of a wireless communication device according to a preferred embodiment of the present invention.

2 is a circuit diagram of the antenna structure of the wireless communication device shown in FIG. 1 without a residual antenna.

3 is a circuit diagram of the antenna structure of the wireless communication device shown in FIG.

4 is a radiation pattern diagram of the antenna structure of the wireless communication device shown in FIG. 1 in which the antenna structure is not provided with a residual antenna.

FIG. 5 is a radiation pattern diagram of an antenna structure for setting a residual antenna in the wireless communication device shown in FIG. 1. FIG.

FIG. 6 is a schematic structural view showing an antenna structure provided with an extension portion in the wireless communication device shown in FIG. 1. FIG.

FIG. 7 is another schematic structural view of the antenna structure of FIG. 1 with an extension portion provided with an antenna structure.

Referring to FIG. 1, a preferred embodiment of the present invention provides an antenna structure 100 that can be applied to a wireless communication device 200 such as a mobile phone or a personal digital assistant to transmit and receive radio waves to transmit and exchange wireless signals.

The wireless communication device 200 also includes a substrate 21. The substrate 21 is a printed circuit board (PCB) which can be made of a dielectric material such as epoxy glass fiber (FR4). The substrate 21 is provided with a system ground plane 211 and a clearance area 213. The clearance area 213 is disposed adjacent to the system ground plane 211. The substrate 21 is further provided with a first feeding point 215 and a grounding point 217. The first feed point 215 is disposed on a side of the system ground plane 211 adjacent to the clearance area 213 for providing signal feeding to the antenna structure 100. The grounding point 217 is disposed on a side of the system ground plane 211 adjacent to the clearance area 213, and is spaced apart from the first feeding point 215 for electrically connecting to the system ground plane 211, and further Antenna structure 100 provides grounding.

The antenna structure 100 includes a radiator 11 and a stub antenna 13. In the embodiment, the radiator 11 is a Global Positioning System (GPS) antenna, and includes a feeding portion 111, a ground portion 113, and a radiation portion 115. In the embodiment, the feeding portion 111 is substantially in the shape of a strip, which is disposed in a plane perpendicular to the substrate 21 and electrically connected to the first feeding point 215 for the radiator. 11 feed current. The grounding portion 113 has a substantially rectangular strip shape and is disposed on a plane of the feeding portion 111. One end of the grounding portion 113 is electrically connected to the grounding point 217 for providing grounding for the radiating portion 115, and the other end extends in a direction parallel to the feeding portion 111, and is further arranged parallel to the feeding portion 111. .

The radiating portion 115 is disposed integrally in a plane parallel to the substrate 21 and above the clearing region 213. The radiating portion 115 is substantially F-shaped and includes a first radiating section 1151, a second radiating section 1153, and a third radiating section 1155. The first radiating section 1151 has a substantially rectangular strip shape, and one end thereof is electrically connected to one end of the feeding portion 111 away from the first feeding point 215, and the other end extends in a direction perpendicular and away from the feeding portion 111. The second radiating section 1153 is substantially in the shape of a strip, and is disposed on the same plane as the first radiating section 1151. One end of the second radiating section 1153 is electrically connected to one end of the grounding portion 113 away from the grounding point 217, and the other end extends in a direction parallel to the first radiating section 1151 and away from the grounding portion 113 to The first radiating segments 1151 are arranged in parallel with each other. The third radiating section 1155 is substantially in the shape of a strip, which is disposed perpendicular to the first radiating section 1151 and the second radiating section 1153. Specifically, one end of the third radiating section 1155 is electrically connected to one end of the second radiating section 1153 away from the grounding portion 113, and the other end extends in a direction perpendicular to and close to the first radiating section 1151 until the first The radiating section 1151 is vertically connected away from one end of the feeding portion 111. The third radiant section 1155 then passes over the first radiant section 1151 to continue extending in a direction perpendicular and away from the first radiant section 1151, thereby being common with the first radiant section 1151 and the second radiant section 1153. The F-type structure is formed.

It can be understood that, in other embodiments, the radiator 11 is not limited to the above structure, and may be other structures. For example, the radiator 11 may also be a monopole antenna, and only the radiator is required to be ensured. 11 can receive GPS signals.

In this embodiment, the stub antenna 13 is substantially L-shaped and disposed in the clearance area 213. The stub antenna 13 includes a first stub 131 and a second stub 133. The first stub 131 is substantially rectangular in shape and is electrically connected to the system ground plane 211. The second stub 133 has a substantially rectangular strip shape, and one end thereof is electrically connected to one end of the first stub 131 away from the system ground plane 211, and the other end is perpendicular to the first stub 131 and close to the The directions of the first radiating section 1151 and the second radiating section 1153 extend until overlapping with the projection of the third radiating section 1155 in the clearance area 213. In this embodiment, the length of the second stub 133 is 19.6 mm, and the distance between the second stub 133 and the third radiating section 1155 is 2.8 mm.

It can be understood that the structure of the stub antenna 13 is not limited to the L-shape described in the above item, and may be other shapes, such as a T-shape, only to ensure that one end of the stub antenna 13 is grounded and the other end is open (open And its open end may overlap with the projection of the third radiant section 1155 at the clearance area 213.

Referring to FIG. 2 together, the antenna structure 100 is not provided with the stub antenna 13 and only the current direction of the radiator 11 is set. Obviously, when current enters from the feed portion 111, current will flow through the third radiant section 1155 to form a current I _{X1 in the} X direction. In addition, the current I _X2 flowing to the ground portion 113 and the current I _X1 cancel each other, so that the current mainly flows in the Y direction to cause polarization in the Y direction, so that most of the radiant energy of the antenna structure 100 is concentrated in the lower half. Course type.

Please refer to FIG. 3 for a schematic diagram of current flow after the radiator 11 and the residual antenna 13 are disposed in the antenna structure 100. Obviously, when current enters from the feed portion 111, current will flow through the third radiant section 1155 to form a current I _{X1 in the} X direction. In addition, due to the arrangement of the L-type stub antenna 13, the currents I _X2 and I _X3 flowing to the ground portion 113 cancel each other, thereby causing the current I _{X1 to} form a polarization in the X direction, thereby causing most of the radiation of the antenna structure 100. The energy is concentrated in the upper half of the court type, thereby effectively improving the performance of the antenna structure 100 for receiving satellite signals.

4 is a radiation pattern diagram of the antenna structure 100 without the stub antenna 13 disposed. Obviously, if the antenna structure 100 is not provided with the stub antenna 13, the radiant energy of the antenna structure 100 is mainly concentrated in the lower half court type. FIG. 5 is a radiation pattern diagram of the antenna structure 100 in which the stub antenna 13 is disposed. Obviously, after the antenna structure 100 is disposed, the radiant energy of the antenna structure 100 is mainly concentrated on the upper half of the stadium type, thereby effectively improving the performance of the antenna structure 100 for receiving satellite signals. The upper half court type and the lower half court type constitute a radiation pattern of the antenna structure 100.

It can be understood that the X, Y, and Z directions of FIGS. 2 to 5 are the same. In FIGS. 2 to 5, the upper direction refers to the direction in which the Y-axis coordinate is increased, and the lower portion refers to the direction in which the Y-axis coordinate decreases. The third radiant section 1155 and the second residual section 133 are both parallel to the X axis. The first radiating section 1151, the second radiating section 1153, and the first stub 131 are all parallel to the Y axis. The feeding portion 111 and the ground portion 113 are both parallel to the Z axis.

In addition, it has been proved that when the antenna structure 100 is not provided with the stub antenna 13, the Partial Radiated Power (PRP) of the upper half field type is -7.21 dBm. When the residual antenna 13 is set, the radiation power of the upper half of the stadium type is -3.09 dBm, which significantly improves the radiation power of the upper half of the stadium type.

Referring to FIG. 6 , in other embodiments, the antenna structure 100 may further include an extension 15 . The wireless communication device 200 also includes a second feed point 219. The second feed point 219 is disposed on a side of the system ground plane 211 near the clearance area 213. In the embodiment, the extension portion 15 has a substantially rectangular strip shape, which is disposed coplanar with the stub antenna 13 . One end of the extending portion 15 is electrically connected to the second signal feeding point 219, and the other end is vertically connected to the second residual portion 133. The extension portion 15 and the first stub segment 131 are disposed in parallel with each other, and are disposed on the same side of the second stub segment 133 as the first stub segment 131, and further form a substantially F-type structure. The extension portion 15 is configured to feed a current signal to the stub antenna 13 so that the stub antenna 13 can operate in the 2.4 GHz band and the 5 GHz band to achieve a dual-frequency design of GPS/WIFI.

Referring to FIG. 7 together, it can be understood that in other embodiments, the extending portion 15 is not limited to the rectangular strip shape described in the above item, and may be other shapes, such as an L shape or a T shape. The extension 15 of Figure 7 is L-shaped. In addition, the extension portion 15 is not limited to being electrically connected to the stub antenna 13 , and may be spaced apart from the stub antenna 13 to couple a current signal to the stub antenna 13 so that The stub antenna 13 operates in the WIFI band.

It can be understood that in other embodiments, the antenna structure 100 further includes an antenna carrier (not shown), and the antenna carrier may be made of an insulating material disposed on the clearance area 213. As such, the stub antenna 13 is not limited to being directly disposed in the clearing area 213 as described in the above item, and may be disposed on the antenna carrier and causing the second stub in the stub antenna 13 133 is spaced from the third radiant section 1155. Of course, the antenna carrier can also be used to carry the radiator 11 , and it is only necessary to ensure that the stub antenna 13 and the third radiator 1155 are spaced apart from each other.

The antenna structure 100 of the present invention and the wireless communication device 200 having the antenna structure 100 change the direction of the ground current of the antenna structure 100 by setting the residual antenna 13, thereby changing the polarization direction thereof, and finally improving the antenna structure. The hemispherical radiation pattern above 100 causes the radiant energy of the antenna structure 100 to be concentrated mainly in the upper hemisphere, so as to effectively improve the transceiving performance of the antenna structure 100.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

100, 200, 300‧‧‧ electronic devices

100‧‧‧Antenna structure

11‧‧‧ radiator

111‧‧‧Feeding Department

113‧‧‧ Grounding Department

115‧‧‧ Radiation Department

1151‧‧‧First radiant section

1153‧‧‧second radiant section

1155‧‧‧third radiant section

13‧‧‧Residual antenna

131‧‧‧First paragraph

133‧‧‧Second paragraph

15‧‧‧Extension

200‧‧‧Wireless communication device

21‧‧‧Substrate

211‧‧‧System ground plane

213‧‧‧ clearance area

215‧‧‧First feed point

217‧‧‧ Grounding point

219‧‧‧second feed point

no

100‧‧‧Antenna structure

11‧‧‧ radiator

111‧‧‧Feeding Department

113‧‧‧ Grounding Department

115‧‧‧ Radiation Department

1151‧‧‧First radiant section

1153‧‧‧second radiant section

1155‧‧‧third radiant section

13‧‧‧Residual antenna

131‧‧‧First paragraph

133‧‧‧Second paragraph

200‧‧‧Wireless communication device

21‧‧‧Substrate

211‧‧‧System ground plane

213‧‧‧ clearance area

215‧‧‧First feed point

217‧‧‧ Grounding point

Claims (11)

An antenna structure includes a radiator that causes polarization in a first direction and concentrates radiant energy of the antenna structure on a first dome type, the improvement being that the antenna structure further includes a stub antenna. One end of the stub antenna is grounded, and the other end is spaced apart from the radiator, and the radiator plus the stub antenna causes polarization in a second direction and concentrates radiant energy of the antenna structure on the second a half court type, wherein the first direction is perpendicular to the second direction, and the first half court type and the second half court type constitute a radiation pattern of the antenna structure. The antenna structure of claim 1, wherein the radiator is a GPS antenna. The antenna structure of claim 1, wherein the radiator includes a feeding portion, a ground portion, and a radiating portion, wherein the feeding portion and the ground portion are disposed on the same plane and are disposed in parallel with each other for respectively Generating a current for the antenna structure and providing ground for the antenna structure, the radiating portion being disposed in a plane perpendicular to the feeding portion and spaced apart from the stub antenna. The antenna structure of claim 3, wherein the radiating portion includes a first radiating portion, a second radiating portion, and a third radiating portion, and one end of the first radiating portion is electrically connected to the feeding portion, The other end extends in a direction perpendicular to and away from the feeding portion, one end of the second radiating section is electrically connected to the grounding portion, and the other end extends in a direction parallel to the first radiating section and away from the grounding portion, Arranging in parallel with the second radiating section, one end of the third radiating section is electrically connected to the second radiating section away from one end of the grounding portion, and the other end extends in a direction perpendicular to and close to the first radiating section Until the first radiating section is perpendicularly connected to one end of the feeding portion, and then the third radiating section passes over the first radiating section to continue extending in a direction perpendicular and away from the first radiating section. The antenna structure of claim 4, wherein the stub antenna is disposed in a plane parallel to the radiating portion, including a first stub and a second stub, the first stub being grounded, One end of the second stub is electrically connected to the first stub, and the other end is vertically connected to the first stub and overlaps with a projection of the third radiating segment on a plane of the stub antenna. The antenna structure of claim 5, wherein the antenna structure further includes an extension portion disposed on a plane of the stub antenna for feeding a current signal to the stub The antenna is such that the stub antenna operates in the WIFI band. The antenna structure of claim 6, wherein the extension is electrically connected to the stub antenna to directly feed the current signal to the stub antenna. The antenna structure of claim 6, wherein the extension is spaced from the stub antenna to couple the current signal to the stub antenna. The antenna structure of claim 1, wherein the antenna structure further comprises an antenna carrier for carrying the residual antenna or the radiator. A wireless communication device comprising the antenna structure of any one of claims 1-9. The wireless communication device of claim 10, wherein the wireless communication device further comprises a substrate, the substrate is provided with a system ground plane and a clearance area disposed adjacent to the system ground plane, the radiator is disposed Above the clearance area, the stub antenna is disposed in the clearance area.