TWI466383B - Dual band antenna and wireless communication device using the same - Google Patents

Description

Dual-frequency antenna and wireless communication device using the same

The present invention relates to an antenna, and more particularly to a dual frequency antenna and a wireless communication device using the same.

With the rapid development of wireless communication technology and information processing technology, mobile wireless communication devices such as mobile phones and personal digital assistants (PDAs) are competing to enter and reach thousands of households, so that consumers can enjoy high anytime and anywhere. The convenience brought by technology has also made these portable wireless communication devices an indispensable part of modern people's daily life.

Among these wireless communication devices, an antenna device for transmitting and receiving radio waves to transmit and exchange radio data signals is undoubtedly one of important components in a wireless communication device. At present, single-frequency antenna devices are generally not easy to meet the needs of dual-frequency or multi-band wireless communication devices. Conventionally, dual-frequency antennas are generally large in size, occupying a large part of the space in the wireless communication device, and are not easy to simultaneously meet the communication of different frequency bands. The requirements of the system and the trend towards the development of wireless communication devices in the direction of thinness and miniaturization.

In addition, the dual-band wireless communication device generally includes a high-frequency antenna and a low-frequency antenna. However, since the circuit board built in the wireless communication device is generally provided with many electronic components, the antenna device is easily exposed to electromagnetic waves when subjected to electromagnetic wave radiation. Component interference, so the radiation efficiency of the antenna will be reduced.

In view of this, it is necessary to provide a dual-frequency antenna with small size and low interference.

In addition, it is also necessary to provide a wireless communication device to which the dual frequency antenna is applied.

A dual-frequency antenna includes a first antenna portion, a second antenna portion, a feed end, and a ground end, and the first antenna portion, the second antenna portion, and the feed end are connected to the ground The first antenna portion and the second antenna portion are respectively disposed on planes of different heights; the first antenna portion and the second antenna portion are both located on the ground end side, and the An antenna portion is a low frequency antenna, and includes a first radiator and a second radiator. The first radiator includes a first strip of a straight strip shape and a second sheet of an L shape, the second sheet The body includes a short side and a long side, the first body is connected at one end to the end of the short side of the second body, and the second radiator comprises a third body and a fourth body, the third One end of the piece is perpendicularly connected to the end of the long side of the second piece, and the other end is perpendicularly connected to the end of the fourth piece; the second antenna part is a high frequency antenna, comprising a main body and one end of the main body a protruding portion of the portion and the other end, the main body and the third piece are parallel to each other, and a narrow gap is formed therebetween, outside the end portion The edge is flush with the main body, the inner edge is protruded from the main body, and the second antenna portion extends along the protruding portion to provide a first bent portion, and the first bent portion is connected to the ground end.

A wireless communication device includes a circuit board having a signal transmission end and a ground plane; the wireless communication device further includes a dual frequency antenna, the dual frequency antenna including a first antenna portion, a first a second antenna portion, a feed end and a ground end; the first antenna portion, the second antenna portion and the feed end are connected to the ground end and integrated, the first antenna portion and the second antenna The antenna portions are respectively disposed on the planes of different heights; the first antenna portion and the second antenna portion are both located on the ground end side; the first antenna portion is a low frequency antenna, and includes a first radiator and a second radiator, the first radiator The first sheet body has a strip shape and an L-shaped second sheet body. The second sheet body includes a short side and a long side, and the first sheet body is connected at one end to the short side end of the second sheet body. The second radiator includes a third body and a fourth body, the third body is perpendicularly connected to the end of the long side of the second body, and the other end is perpendicularly connected to the end of the fourth body; The second antenna portion is a high frequency antenna, and includes a main body and a protruding portion disposed at one end and the other end of the one end of the main body. The main body and the third piece are parallel to each other and formed therebetween. a narrow notch, the outer edge of the end is flush with the main body, the inner edge is protruded from the main body, and the second antenna portion extends along the protruding portion to provide a first bending portion, the first bending portion and the first bending portion The grounding end is connected, and the feeding end and the grounding end are electrically connected to the signal transmitting end and the grounding surface of the circuit board respectively.

Compared with the prior art, the dual-frequency antenna fully utilizes the space of different heights of the wireless communication device while obtaining two working frequencies, so as to facilitate the miniaturization of the wireless communication device. At the same time, the first antenna portion and the second antenna portion are both located on the ground end side, which reduces interference of external electronic components.

100‧‧‧Double frequency antenna

10‧‧‧First antenna unit

11‧‧‧First radiator

111‧‧‧ first body

112‧‧‧Second body

1121‧‧‧ Short side

1122‧‧‧Longside

113‧‧‧First positioning hole

12‧‧‧Second radiator

121‧‧‧ third body

122‧‧‧Four piece

20‧‧‧second antenna unit

21‧‧‧ Subject

22‧‧‧ End

23‧‧‧ protruding parts

24‧‧‧First bend

241‧‧‧Second positioning hole

30‧‧‧Feeding end

31‧‧‧ board

32‧‧‧Second bend

321‧‧‧First connection

322‧‧‧5th body

40‧‧‧ Grounding terminal

41‧‧‧ base

411‧‧‧Substrate

412‧‧‧1 piece

42‧‧‧second connection

43‧‧‧ third connection

50‧‧‧Length gap

1 is a perspective view of a dual frequency antenna according to a preferred embodiment of the present invention.

The dual-band antenna of the present invention is installed in a portable wireless communication device such as a wireless communication device or a personal digital assistant (PDA), and is configured to transmit and receive radio waves to transmit and exchange radio data signals.

Referring to FIG. 1 , the dual-frequency antenna 100 is made of a thin metal plate, and includes a first antenna portion 10 , a second antenna portion 20 , a feed end 30 , and a ground end 40 . The first antenna portion 10, the second antenna portion 20, and the feed end 30 are connected to the ground terminal 40, and are integrally connected via the ground terminal 40.

The first antenna portion 10 is a low frequency antenna for transmitting and receiving low frequency communication electromagnetic wave signals. The first antenna portion 10 has a meandering design and includes a first radiator 11 and a second radiator 12.

The first radiator 11 is substantially U-shaped, and the first radiator 11 includes a first strip 111 of a straight strip shape and a second sheet 112 of an L shape. The second body 112 includes a short side 1121 and a long side 1122, which are vertically connected at the end. One end of the first body 111 is connected to the end of the short side 1121 of the second body 112 such that the first body 111 is parallel to the long side 1122 of the second body 112. A first positioning hole 113 is defined in each of the end of the first body 111 and the second body 112. The first positioning hole 113 is used for fixing the dual-frequency antenna 100 in the wireless communication device.

The second radiator 12 is substantially L-shaped, and the second radiator 12 includes a third body 121 and a fourth body 122. One end of the third piece 121 is perpendicularly connected to the end of the long side 1122 of the second piece 112, and the other end is perpendicularly connected to the end of the fourth piece 122.

The fourth body 122 and the long sides 1122 of the first body 111 and the second body 112 are parallel to each other, and the length of the fourth body 122 is slightly smaller than the first piece 111, the first piece The body 111, the second body 112, the third body 121, and the fourth body 122 have the same width, so that the first antenna portion 10 has a meander shape as a whole.

The second antenna unit 20 is a high frequency antenna for transmitting and receiving high frequency communication electromagnetic wave signals. The main body 21 is a strip-shaped body. The main body 21 has one end 22 extending at one end thereof. One end is provided with a projection 23 having a substantially semicircular arc shape. The width of the end portion 22 is slightly larger than the main body 21, the outer edge of the end portion 22 is flush with the main body 21, the inner edge is protruded from the main body 21, and a convex arc-shaped transition is adopted at the joint with the main body 21. The outer edge of the protruding portion 23 is substantially semi-circular in shape to fit other components of the wireless communication device and reduce the volume thereof. The central portion and the main portion of the projection 23 The body 21 is connected at one end, and adopts a concave curved smooth transition with the outer edge of the main body 21 to form a smooth curve with the outer edge of the main body 21. A second positioning hole 241 is defined in the first bending portion 24, and the second positioning hole 241 is configured to extend the other end of the protruding portion 23. The dual band antenna 100 is fixed in the wireless communication device.

The main body 21 of the second antenna portion 20 and the third body 121 of the first antenna portion 10 are parallel to each other, and an elongated notch 50 is formed therebetween. The width of the opening of the narrow notch 50 can be adjusted to adjust the antenna. Performance, such as antenna frequency, allows the dual band antenna 100 to achieve better communication performance.

The feeding end 30 includes a substantially L-shaped plate body 31 and a second bending portion 32 disposed at an edge of the plate body 31. The second bending portion 32 includes a first connecting end 321 and a fifth portion. The first connecting portion 321 is perpendicular to the plane of the plate body 31 and the fifth body 322, and is respectively connected to the ends of the plate body 31 and the fifth body 322, and the three are integrated. The fifth sheet body 322 is parallel to both the first sheet body 111 and the fourth sheet body 122.

The grounding end 40 includes a substantially T-shaped base body 41. The base body 41 includes a strip-shaped base plate 411 and a tab 412 projecting horizontally from an intermediate position of the base plate 411. The second end of the substrate 411 is respectively provided with a second connecting end 42. The second connecting end 42 is formed at two ends of the substrate 411 and extends along a plane perpendicular to the plane of the substrate 411 to respectively connect the second end. The antenna unit 20 and the feed end 30. At the same time, the substrate 411 is provided with a third connecting end 43 at a position adjacent to the feeding end 30 of the inner edge thereof. The third connecting end 43 is used for connecting the first antenna portion 10, because the third connecting end 43 and the second end There is a height difference between the connecting ends 42 such that the first antenna portion 10 and the second antenna portion 20 are respectively at planes of different heights.

The grounding terminal 40 and the feeding end 30 are respectively connected to the internal circuit board of the wireless communication device (not shown) The ground plane and the signal transmission end are connected, and a current loop is formed between the ground terminal 40 and the feed end 30, so that the first antenna portion 10 and the second antenna portion 20 form a dual-frequency loop structure, so that The preferred embodiment of the present invention dual frequency antenna 100 can be used in two operating frequency bands.

It can be understood that the first positioning hole 113 and the second positioning hole 241 are not limited to the above-mentioned number and position, and only serve to fix the dual-frequency antenna 100 to the wireless communication device.

The first antenna portion 10 and the second antenna portion 20 of the dual-band antenna 100 are located on different planes, and fully utilize the space of the wireless communication device at different heights, thereby effectively reducing the occupied volume and facilitating the small size of the wireless communication device. Chemical. Meanwhile, the first antenna portion 10 and the second antenna portion 20 of the dual-band antenna 100 are both located on one side of the ground end 40, and the low-frequency antenna first antenna portion 10 is located at the second antenna portion 20 of the high-frequency antenna. On the inner side, the low frequency antenna that is easily interfered is kept away from the external electronic components, thereby reducing the overall interference of the external electronic components on the dual frequency antenna 100, and improving the radiation efficiency of the dual frequency antenna 100.

In addition, various modifications, additions and substitutions in the form and details may be made by those skilled in the art in the scope and spirit of the invention. It is a matter of course that various modifications, additions and substitutions made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

100‧‧‧Double frequency antenna

10‧‧‧First antenna unit

11‧‧‧First radiator

111‧‧‧ first body

112‧‧‧Second body

1121‧‧‧ Short side

1122‧‧‧Longside

113‧‧‧First positioning hole

12‧‧‧Second radiator

121‧‧‧ third body

122‧‧‧Four piece

20‧‧‧second antenna unit

21‧‧‧ Subject

22‧‧‧ End

23‧‧‧ protruding parts

24‧‧‧First bend

241‧‧‧Second positioning hole

30‧‧‧Feeding end

31‧‧‧ board

32‧‧‧Second bend

321‧‧‧First connection

322‧‧‧5th body

40‧‧‧ Grounding terminal

41‧‧‧ base

411‧‧‧Substrate

412‧‧‧1 piece

42‧‧‧second connection

43‧‧‧ third connection

50‧‧‧Length gap

Claims (7)

A dual-frequency antenna includes a first antenna portion, a second antenna portion, a feed end, and a ground end, and the first antenna portion, the second antenna portion, and the feed end are connected to the ground end The first antenna portion and the second antenna portion are respectively disposed on planes of different heights; the first antenna portion and the second antenna portion are both located on the ground end side. The first antenna portion is a low frequency antenna, and includes a first radiator and a second radiator. The first radiator includes a first strip of a straight strip shape and a second sheet of an L shape. The second body includes a short side and a long side, and the first body is connected at one end to the end of the short side of the second body, and the second radiator includes a third body and a fourth body. One end of the third piece is perpendicularly connected to the end of the long side of the second piece, and the other end is perpendicularly connected to the end of the fourth piece; the second antenna part is a high frequency antenna, including a main body and is disposed on the main body a protrusion at one end and the other end, the body and the third body being parallel to each other and forming a narrow gap therebetween The outer edge of the end portion is flush with the main body, and the inner edge is protruded from the main body. The second antenna portion extends along the protruding portion to provide a first bent portion, and the first bent portion is connected to the ground end. The dual-frequency antenna of claim 1, wherein the feeding end comprises a substrate and a second bent portion formed by bending and extending the substrate, the substrate being connected to the ground. The dual-frequency antenna of claim 2, wherein the second bending portion comprises a fifth body and a first connecting end, and one end of the first connecting end is vertically connected to the fifth piece The other end is perpendicularly connected to the substrate. The dual-frequency antenna of claim 3, wherein the grounding end comprises a base body, two second connecting ends and a third connecting end, wherein the second connecting end and the third connecting end have a height difference. The second connecting ends are respectively connected to the first bending portion and the feeding end, and the third connecting end is connected to the first radiator. A wireless communication device includes a circuit board having a signal transmission end and a ground plane; the wireless communication device further includes a dual frequency antenna, the dual frequency antenna including a first antenna portion, a first a second antenna portion, a feed end, and a ground end; the first antenna portion, the second antenna portion, and the feed end are all connected to the ground end and integrated, and the improvement is: the first antenna The first antenna portion and the second antenna portion are respectively located on a ground end side; the first antenna portion is a low frequency antenna, including a first a radiator and a second radiator, the first radiator comprising a first strip of a straight strip shape and a second sheet of an L shape, the second sheet body comprising a short side and a long side, the first One end of the body is connected to the end of the short side of the second body, the second radiator includes a third body and a fourth body, and the third body is vertically connected to the long side of the second body The other end is perpendicularly connected to the end of the fourth piece; the second antenna part is a high frequency antenna, including a main And a protruding portion disposed at one end and the other end of the one end of the main body, the main body and the third piece are parallel to each other, and an elongated notch is formed therebetween, and the outer edge of the end is flat with the main body The inner edge is protruded from the main body, and the second antenna portion extends along the protruding portion to provide a first bent portion. The first bent portion is connected to the ground end, and the feeding end and the ground end are connected to the circuit board. The signal transmission end and the ground plane are electrically connected. The wireless communication device of claim 5, wherein the feeding end comprises a substrate and a second bent portion formed by bending and extending the substrate, the substrate being connected to the ground. The wireless communication device of claim 6, wherein the grounding end comprises a base body, two second connecting ends and a third connecting end, wherein the second connecting end and the third connecting end have a height difference, The two connection ends are connected to the first antenna portion and the substrate, and the third connection end is connected to the second antenna portion.