TWI619305B - Antenna structure and wireless communication device with same - Google Patents

Abstract

The present invention provides an antenna structure including a radiator, the radiator causes polarization in a first direction and radiates energy of the antenna structure to a first hemisphere type. The antenna structure further includes a stub antenna. One end of the stub antenna is grounded, and the other end is spaced from the radiator. The radiator plus the stub antenna causes polarization in the second direction and causes the radiant energy of the antenna structure to be concentrated in the second half. The court type, wherein the first direction is perpendicular to the second direction, and the first hemi-field type and the second hemi-field type form a radiation field type 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 antenna structure.

With the advancement of wireless communication technology, wireless communication devices continue to develop in a thin and light trend, and consumers have increasingly higher requirements for the appearance and performance of wireless communication devices. At present, most wireless communication devices have a Global Positioning System (GPS) function to assist drivers in understanding road conditions, positions, directions, speeds, and the like. As far as antenna design is concerned, GPS antennas are usually designed on top of wireless communication devices, so it is easy to cause the strongest energy of the antenna to be mainly concentrated in the lower hemisphere, and then affect the antenna's transmitting and receiving performance.

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

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

An antenna structure includes a radiator, the radiator causes polarization in a first direction and radiates energy of the antenna structure to a first hemisphere type, and the antenna structure further includes a stub antenna, and the stub One end of the antenna is grounded, and the other end is spaced from the radiator. The radiator plus the stub antenna causes polarization in the second direction and causes the radiant energy of the antenna structure to be concentrated in the second hemisphere. Wherein the first direction is perpendicular to the second direction, and the first hemi-field type and the second hemi-field type form a radiation field type of the antenna structure.

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

The antenna structure and the wireless communication device having the antenna structure are provided with the stub antenna to change the direction of the ground current of the antenna structure, thereby changing the polarization direction, and finally improving the radiation pattern of the upper hemisphere of the antenna structure. The radiant energy of the antenna structure is mainly concentrated in the upper hemisphere, so as to effectively improve the transmitting and receiving performance of the antenna structure.

100, 200, 300‧‧‧ electronic devices

100‧‧‧ Antenna Structure

11‧‧‧ radiator

111‧‧‧Feeding Department

113‧‧‧ Ground

115‧‧‧Radiation Department

1151‧‧‧First Radiation Segment

1153‧‧‧Second Radiation Section

1155‧‧‧third radiation segment

13‧‧‧ stub antenna

131‧‧‧ First Remnant

133‧‧‧ Second Remnant

15‧‧‧ extension

200‧‧‧Wireless communication device

21‧‧‧ substrate

211‧‧‧system ground plane

213‧‧‧headroom

215‧‧‧First feed point

217‧‧‧ ground

219‧‧‧Second Feed Point

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

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

FIG. 3 is a circuit diagram of a stub antenna provided with an antenna structure in the wireless communication device shown in FIG. 1. FIG.

FIG. 4 is a radiation pattern diagram of the antenna structure of the wireless communication device shown in FIG. 1 without a stub antenna.

FIG. 5 is a radiation pattern diagram of a stub antenna provided with an antenna structure in the wireless communication device shown in FIG. 1. FIG.

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

FIG. 7 is another schematic structural diagram of an antenna structure provided with an extension in the wireless communication device shown in FIG. 1.

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

The wireless communication device 200 further 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 ground point 217. The first feeding point 215 is disposed on one side of the system ground plane 211 near the clearance area 213, and is used to provide a signal feeding for the antenna structure 100. The ground point 217 is disposed on one side of the system ground plane 211 close to the clearance area 213 and is spaced from the first feed point 215 to be electrically connected to the system ground plane 211, and further the The antenna structure 100 provides ground.

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

The radiation portion 115 is entirely disposed in a plane parallel to the substrate 21 and is located above the clearance area 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, one end of which 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 to and away from the feeding portion 111. The second radiating section 1153 is substantially in a rectangular strip shape, and is disposed on the same plane as the first radiating section 1151. All One end of the second radiating section 1153 is electrically connected to one end of the ground portion 113 far from the ground point 217, and the other end extends in a direction parallel to the first radiating section 1151 and away from the ground portion 113 to communicate with the ground. The first radiation sections 1151 are arranged in parallel with each other. The third radiating section 1155 is substantially rectangular strip-shaped, and is disposed perpendicular to the first radiating section 1151 and the second radiating section 1153. Specifically, one end of the third radiating segment 1155 is electrically connected to one end of the second radiating segment 1153 far from the ground portion 113, and the other end extends in a direction perpendicular to and close to the first radiating segment 1151 until it is in contact with the first radiating segment. One end of the radiating section 1151 away from the feeding portion 111 is vertically connected. Then, the third radiating segment 1155 passes over the first radiating segment 1151 so as to continue to extend in a direction perpendicular to and away from the first radiating segment 1151, and then shares with the first radiating segment 1151 and the second radiating segment 1153 The F-type structure is formed.

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

In this embodiment, the stub antenna 13 is substantially L-shaped and is disposed in the headroom area 213. The stub antenna 13 includes a first stub 131 and a second stub 133. The first stub 131 is substantially a rectangular strip, and is electrically connected to the system ground plane 211. The second stub 133 is substantially a rectangular strip, one end of which 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 is close to the first stub 131. 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 on the headroom area 213. In this embodiment, the length of the second residual segment 133 is 19.6 mm, and the distance between the second residual segment 133 and the third radiation segment 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 it can also have other shapes, such as a T-shape. It only needs to ensure that one end of the stub antenna 13 is grounded and the other end is open. ), And its open end can be connected to the third radiation segment 1155 in the headroom 213 The projections overlap.

Please refer to FIG. 2 together, which is a schematic diagram of a current trend of the antenna structure 100 without the stub antenna 13 and only the radiator 11. Obviously, when the current enters from the feeding portion 111, the current will flow through the third radiation 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 radiated energy of the antenna structure 100 is concentrated in the lower half. Course type.

Please refer to FIG. 3 together, a schematic diagram of a current trend of the antenna structure 100 after the radiator 11 and the stub antenna 13 are provided. Obviously, when the current enters from the feeding portion 111, the current will flow through the third radiation section 1155 to form a current I _{X1 in the} X direction. In addition, due to the arrangement of the L-shaped stub antenna 13, the currents I _X2 and I _X3 flowing to the ground portion 113 cancel each other out, so that the current I _X1 is polarized in the X direction, so that most of the antenna structure 100 radiates The energy is concentrated in the upper hemisphere type, thereby effectively improving the performance of the antenna structure 100 receiving satellite signals.

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

It can be understood that the X, Y, and Z directions in FIGS. 2 to 5 are all the same. In FIGS. 2 to 5, the upper direction refers to the direction in which the Y-axis coordinate increases, and the lower direction refers to the direction in which the Y-axis coordinate decreases. The third radiation segment 1155 and the second residual segment 133 are both parallel to the X axis. The first radiation segment 1151, the second radiation segment 1153, and the first residual segment 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, tests have proven that when the antenna structure 100 is not provided with the stub antenna 13, the radiated power (Partial Radiated Power, PRP) of the upper hemisphere is -7.21 dBm. After the stub antenna 13 is provided, the radiated power of the upper hemispheric type is -3.09 dBm, which significantly improves the radiated power of the upper hemisphere type.

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

Please refer 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 in FIG. 7 is L-shaped. In addition, the extension 15 is not limited to being electrically connected to the stub antenna 13, and may be disposed at a distance from the stub antenna 13, so as to couple a current signal to the stub antenna 13 so that all The stub antenna 13 operates in the WIFI frequency band.

It can be understood that, in other embodiments, the antenna structure 100 further includes an antenna carrier (not shown). The antenna carrier may be made of an insulating material and disposed on the headroom 213. In this way, the stub antenna 13 is not limited to being directly disposed in the headroom as described in the above item. 213. It can also be arranged on the antenna carrier, and the second stub 133 in the stub antenna 13 is spaced from the third radiating 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 is spaced from the third radiator 1155.

The antenna structure 100 of the present invention and the wireless communication device 200 having the antenna structure 100 are provided with the stub antenna 13 to change the direction of the ground current of the antenna structure 100, thereby changing its polarization direction, and finally improving the antenna structure. The radiation pattern of the upper hemisphere of 100 makes the radiant energy of the antenna structure 100 mainly concentrated in the upper hemisphere, so as to effectively improve the transmitting and receiving performance of the antenna structure 100.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the present invention in any form. In addition, those skilled in the art can make other changes within the spirit of the present invention. Of course, these changes made in accordance with the spirit of the present invention should be included in the scope of protection of the present invention.

100‧‧‧ Antenna Structure

11‧‧‧ radiator

111‧‧‧Feeding Department

113‧‧‧ Ground

115‧‧‧Radiation Department

1151‧‧‧First Radiation Segment

1153‧‧‧Second Radiation Section

1155‧‧‧third radiation segment

13‧‧‧ stub antenna

131‧‧‧ First Remnant

133‧‧‧ Second Remnant

200‧‧‧Wireless communication device

21‧‧‧ substrate

211‧‧‧system ground plane

213‧‧‧headroom

215‧‧‧First feed point

217‧‧‧ ground

Claims (11)

An antenna structure includes a radiator. The radiator causes polarization in a first direction and concentrates radiant energy of the antenna structure in a first hemisphere. The improvement is that the antenna structure further includes a stub antenna and An extension, one end of the stub antenna is grounded, and the other end is spaced from the radiator. The radiator plus the stub antenna causes polarization in the second direction and concentrates the radiant energy of the antenna structure. In the second hemisphere type, wherein the first direction is perpendicular to the second direction, the first hemisphere type and the second hemisphere type form a radiation field type of the antenna structure, and the extension portion It is arranged on the plane where the stub antenna is located, and is used to feed a current signal to the stub antenna, so that the stub antenna works in the WIFI frequency band. The antenna structure according to item 1 of the scope of patent application, wherein the radiator is a GPS antenna. The antenna structure according to item 1 of the scope of patent application, wherein the radiator includes a feeding portion, a ground portion, and a radiating portion, and the feeding portion and the ground portion are disposed on the same plane and are arranged in parallel with each other to separate A current is fed to the antenna structure and a ground is provided for the antenna structure. The radiating portion is disposed in a plane perpendicular to the feeding portion and is spaced from the stub antenna. The antenna structure according to item 3 of the scope of patent application, wherein the radiating section includes a first radiating section, a second radiating section, and a third radiating section, and one end of the first radiating section is electrically connected to the feeding section, The other end extends in a direction perpendicular to and away from the feeding portion, one end of the second radiation segment is electrically connected to the ground portion, and the other end extends in a direction parallel to the first radiation segment and away from the ground portion, It is arranged parallel to the second radiating section, one end of the third radiating section is electrically connected to one end of the second radiating section away from the ground, and the other end extends in a direction perpendicular to and close to the first radiating section. Until it is vertically connected to one end of the first radiating section away from the feeding portion, and then the third radiating section passes over the first radiating section to continue along the vertical And extending away from the first radiation segment. The antenna structure according to item 4 of the scope of patent application, wherein the stub antenna is disposed in a plane parallel to the radiating part, and includes a first stub and a second stub, and the first stub is 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 the projection of the third radiating section on the plane where the stub antenna is located. The antenna structure according to item 1 of the scope of patent application, wherein the extension is electrically connected to the stub antenna to directly feed the current signal to the stub antenna. The antenna structure according to item 1 of the scope of patent application, wherein the extension portion is spaced from the stub antenna to couple the current signal to the stub antenna. The antenna structure according to item 1 of the patent application scope, wherein the antenna structure further comprises an antenna carrier for carrying the stub antenna or the radiator. An antenna structure includes a radiator. The radiator causes polarization in a first direction and concentrates radiant energy of the antenna structure in a first hemisphere. The improvement is that the antenna structure further includes a stub antenna and An antenna carrier for carrying the stub antenna or the radiator, one end of the stub antenna is grounded, and the other end is spaced from the radiator, and the radiator is added with the stub The antenna causes polarization in a second direction and causes the radiant energy of the antenna structure to be concentrated in a second hemisphere type, wherein the first direction is perpendicular to the second direction, and the first hemisphere type and the first The two hemispheres form the radiation field type of the antenna structure. A wireless communication device includes the antenna structure according to any one of claims 1-9 of the scope of patent application. The wireless communication device according to item 10 of the scope of patent application, wherein the wireless communication device further includes a substrate, and the substrate is provided with a system ground plane and is adjacent to the system A clearance area provided on the ground plane, the radiator is disposed above the clearance area, and the stub antenna is disposed in the clearance area.