TWI550957B - Mobile communication device having an antenna - Google Patents

Description

Mobile communication device with antenna

The present invention relates to a mobile communication device, and more particularly to a mobile communication device having a capacitively coupled antenna architecture.

With the rapid evolution of wireless communication technology, the wireless communication industry has been booming, making the integration of light, thin, short, small and multi-band operation of mobile communication devices a very important design goal, so it is applied to mobile communication devices. Antennas must have small size and multi-band operation requirements.

However, the existing antennas disposed on mobile communication devices (eg, mobile phones) are mostly Planar Inverted F Antenna (PIFA) antenna architectures, which can generate a limited bandwidth, and therefore, to satisfy a large bandwidth. The need for existing technology must be combined with the use of tunable circuit components (eg, capacitors) to switch the resonant frequency of the antenna's low or high frequencies to achieve the desired resonant bandwidth. However, in a limited space, the setting of the tunable circuit components not only causes troubles in layout, but also increases the cost burden.

The main object of the present invention is to provide a mobile communication device having a capacitively coupled antenna architecture.

To achieve the above object, the mobile communication device with an antenna of the present invention includes a housing, a substrate, a ground plane, a ground path conductor, and a feed antenna unit. The housing includes a metal back cover, and the metal back cover includes a radiating portion and a non-radiating portion, and the radiating portion is electrically insulated from the non-radiating portion. The substrate is disposed inside the casing. The ground plane is inside the housing. One end of the ground path conductor is connected to the radiating portion, and the other end is connected to the ground plane. The feeding antenna unit includes a first radiating element and a second radiating element. The first radiating member is disposed on the substrate, and one end of the first radiating member is a feeding point of the antenna. The second radiating member is disposed between the radiating portion and the substrate, and the second radiating member is coupled to the first radiating member and spaced apart from the radiating portion by a distance. Thereby, the radiating portion is excited by the feeding antenna unit by capacitive coupling, so that the radiating portion resonates with the feeding antenna unit to generate a lowest frequency resonant mode and a higher order resonant mode.

According to an embodiment of the present invention, the mobile communication device of the present invention further includes a partition block. The partitioning block is disposed between the second radiating member and the radiating portion for the second radiating member to be attached.

According to an embodiment of the invention, the mobile communication device of the present invention further includes a conductive switch, one end of the conductive switch is connected to the ground plane, and the other end is connected to the ground path conductor.

According to an embodiment of the present invention, the mobile communication device of the present invention further includes a radiation conductor, the radiation conductor is disposed on the substrate, and one end of the radiation conductor is connected to the ground plane; the radiation conductor is excited by the capacitive coupling of the feeding antenna unit to generate a resonance Modal.

According to an embodiment of the invention, the bandwidth of the lowest frequency resonant mode covers 704~960 MHz, and the high-order resonant mode and the resonant mode composite bandwidth cover 1575~2700 MHz.

According to an embodiment of the invention, the spacing distance is substantially 2 mm.

According to an embodiment of the invention, the metal back cover has a thickness of about 1 mm.

According to an embodiment of the invention, the ground plane is a system ground plane of the mobile communication device.

In order to enable the reviewing committee to better understand the technical contents of the present invention, the preferred embodiments are described below.

Please refer to Figure 1 to Figure 4 together. 1 is a partial exploded view of the mobile communication device of the present invention; FIG. 2 is a plan view of the inner surface of the metal back cover of the housing of the mobile communication device of the present invention; FIG. 3 is a front cover inner surface of the housing of the mobile communication device of the present invention; 4 is a side cross-sectional view of the mobile communication device of the present invention.

As shown in FIG. 1, in an embodiment of the present invention, a mobile communication device 1 having an antenna includes a housing 10, a substrate 20, a ground plane 30, a ground path conductor 40, a feeding antenna unit 50, and a partition block. 60. Radiation conductor 70, universal serial bus bar connection 埠U, audio socket AJ and speaker SP. In the specific embodiment of the present invention, the mobile communication device 1 is a smart phone, but the invention is not limited thereto, and the mobile communication device 1 can also be a tablet computer or other electronic products with communication functions.

As shown in FIG. 1, in an embodiment of the present invention, the housing 10 includes a front cover 11 and a metal back cover 12 detachably coupled to the front cover 11, wherein the metal back cover is as shown in FIG. 12 includes a radiation portion 121 and a non-radiation portion 122. The radiation portion 121 is located near the lower side of the metal back cover 12, and the radiation portion 121 is electrically isolated from the non-radiation portion 122, that is, the radiation portion 121 and the non-radiation portion 122. They are not electrically connected to each other. Electrical isolation can be achieved by providing a plastic gap 90 (about 2 mm wide) between the radiation portion 121 and the non-radiation portion 122 to isolate the electrical properties of both sides. In a specific embodiment of the invention, the metal back cover 12 has a thickness of about 1 mm (as shown in FIG. 4), but the invention is not limited thereto.

As shown in FIG. 3, in an embodiment of the present invention, the substrate 20 is disposed inside the casing 10 and located on the inner side surface of the front cover 11, and is located at a position opposite to the radiation portion 121 of the metal back cover 12. Corresponding.

In an embodiment of the invention, the ground plane 30 is located inside the housing 10 and is disposed on the front cover 11. The grounding surface 30 includes a main plate portion 31 and an extending portion 32. The extending portion 32 is formed by one side of the main plate portion 31 extending toward a side of the front cover 11 and is located at a position of the radiating portion 121 of the metal back cover 12. Corresponding to the upper and lower sides, the ground plane 30 is the system ground plane of the mobile communication device 1.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, in one embodiment of the present invention, the ground path conductor 40 includes a first connecting member 41, a second connecting member 42, and a metal member 43. The first connecting member 41 is attached to the radiation portion 121 of the metal back cover 12. The second connecting member 42 is disposed on the substrate 20, and when the front cover 11 is combined with the metal back cover 12, the second connecting member 42 is in contact with the first connecting member 41. The metal member 43 is disposed on the substrate 20, and is a path for prolonging the resonance (that is, lengthening the path FE distance shown in FIG. 3), and the metal member 43 is formed by bending a plurality of times according to actual needs, but not limited thereto. One end of the metal member 43 is connected to the second connecting member 42, and the other end thereof is connected to the grounding surface 30, that is, one end of the metal member 43 is grounded. In a specific embodiment of the present invention, the first connecting member 41 and the second connecting member are metal elastic pieces, but the invention is not limited thereto.

In an embodiment of the invention, the feed antenna unit 50 includes a first radiating element 51 and a second radiating element 52. The first radiating member 51 is disposed on the substrate 20 and includes a third connecting member 511 and a first radiating member body 512. The first radiating member body is added to increase the resonant path (that is, increase the path BC shown in FIG. 3). One end of the 512 is opened after being bent once, and the other end is connected to the third connecting member 511, which is the feeding point FP of the antenna. The second radiating element 52 is disposed between the radiating portion 121 and the substrate 20, and includes a fourth connecting member 521 and a second radiating member body 522, wherein the resonant path is extended (that is, the path QR and path shown in FIG. 2 are extended). POS), the width of both ends of the second radiator member 522 is larger than the intermediate portion. The fourth connecting member 521 is connected to the second radiating member body 522, and when the front cover 11 is combined with the metal back cover 12, the fourth connecting member 521 is in contact with the third connecting member 511 to connect the second radiating member 52 to the first radiation. The member 51 is spaced apart from the radiating portion 121 of the metal back cover 12 by a distance of 2 mm (as shown in FIG. 4), but the invention is not limited thereto. In the embodiment of the present invention, the third connecting member 511 and the fourth connecting member 521 are also metal elastic pieces, but the invention is not limited thereto.

As shown in FIG. 1, in one embodiment of the present invention, the partitioning block 60 is disposed between the second radiating member body 522 of the second radiating member 52 and the radiating portion 121 of the metal back cover 12, and the partitioning block 60 is Made of conductive material. A partitioning block 60 is attached to the inner side surface of the radiating portion 121 of the metal back cover 12 to provide a second radiating member 52 attachment setting. Since in the present embodiment, the distance between the second radiating member 52 and the radiating portion 121 is about 2 mm, the thickness of the partitioning block 60 is approximately equal to 2 mm.

In one embodiment of the invention, the radiating conductor 70 is disposed on the substrate 20, and one end of the radiating conductor 70 is coupled to the extension 32 of the ground plane 30 (i.e., one end is grounded) and the other end is an open circuit.

In one embodiment of the invention, the universal serial bus bar connection U is disposed on the extension 32 of the ground plane 30. The audio jack AJ is also disposed on the extension 32 and adjacent to the universal serial bus bar 埠U. The speaker SP is disposed on the substrate 20, and at least one side thereof is connected to the ground plane 30 to be grounded.

Next, please refer to FIG. 2 to FIG. 5 together, wherein FIG. 5 is a graph showing the voltage standing wave ratio (VSWR) measurement result generated by the antenna of the mobile communication device of the present invention.

As shown in FIG. 2 and FIG. 3, it shows a plan view of the inner side surfaces of the metal back cover 12 and the front cover 11, respectively. After the metal back cover 12 and the front cover 11 are coupled to each other (i.e., after the metal back cover 12 shown in FIG. 2 is turned over, covering the front cover 11 shown in FIG. 3), the point B shown in FIG. The P point shown in FIG. 2 is in contact with each other (the two points are the positions of the third connecting member 511 and the fourth connecting member 521 respectively), that is, the first radiating member 51 is connected to the second radiating member 52 to form a radiation unit. One end of a radiation unit is the feed point FP of the antenna. On the other hand, when the metal back cover 12 and the front cover 11 are coupled to each other, the first connecting member 41 will be in contact with the second connecting member 42 (in this embodiment, the G point will be in contact with the N point, and the point F) The radiation portion 121 of the metal back cover 12 is connected to the ground path conductor 40 to form another radiation unit, and one end of the other radiation unit is grounded. Since the second radiating element 52 is spaced apart from the radiating portion 121 of the metal back cover 12 by a distance (also referred to as a coupling pitch), the radiating portion 121 of the metal back cover 12 and the ground path conductor 40 are formed. The radiating element, that is, excited by another radiating element formed by the feeding antenna unit 50, generates a lowest frequency resonant mode and a higher order resonant mode, and at the same time, the radiating conductor 70 and the second radiating element 52 is spaced apart by a certain distance, so the radiation conductor 70 is also excited by the capacitive coupling of the feeding antenna unit 50 to generate a resonant mode to increase the operating bandwidth of the high-order resonant mode of the antenna.

In this embodiment, the radiation portion 121, the metal member 43, the first radiation member 51, and the second radiation member 52 are appropriately designed in length and width, and the universal serial bus bar connection 埠U and the audio socket AJ are appropriately disposed. The position of the speaker SP and the components, for example, as shown in FIG. 2 and FIG. 3, the radiation portion 121 and the ground path conductor 40 can effectively resonate with the feed antenna unit 50 to cover a minimum bandwidth of 704 to 960 MHz. The frequency resonance mode (Fig. 5 is a voltage standing wave ratio (VSWR) measurement result diagram in which the operation frequency band 1 is the lowest frequency resonance mode), and simultaneously transmits the radiation conductor 70 and the feeding antenna unit 50 of an appropriate length and width. The capacitive coupling excitation will cause the high-order resonant mode to be added to the resonant mode generated by the radiating conductor 70 and the feeding antenna unit 50 to cover a bandwidth of about 1575 to 2700 MHz (including the operating band 2 shown in FIG. 5). , 3, 4 and 5), the application frequency bands covered include LTE700/EGSM900/DCS1800/PCS1900/UMTS2100/LTE2500.

Further, in detail, the path ABOPQR fed to the antenna unit 50 and the path DEFGMN of the radiating portion 121 and the ground path conductor 40 can cause the feeding antenna unit 50 and the radiating portion 121 to be coupled to resonate to the resonant frequency of the operating band 1 (704 to 960). MHz) and the resonant frequency of operating band 3 (double the frequency of the resonant frequency of operating band 1, approximately 1710 to 1950 MHz). The extension of the path O-P-S fed into the antenna unit 50 allows the feed antenna unit 50 and the radiating portion 121 to resonate out of the resonant frequency of the operating band 2, thus allowing the generated frequency to cover 1575 MHz. The radiating element formed by the radiating conductor 70 (ie, the path IJ) and the radiating portion 121 and the grounding path conductor 40 is coupled to resonate with the resonant frequency of the operating band 4 (about 1950 to 2170 MHz) while adjusting the relationship between the radiating conductor 70 and the speaker SP. The width and length allow the resonant frequency of the operating band 4 to be covered to 1900 MHz; in addition, the resonant path of the radiating conductor 70 can be increased by adjusting the distance g between one side of the speaker SP and the extension 32 of the ground plane 30. Feeding the path B-C extended by the antenna unit 50 allows the first feed antenna unit 50 and the radiating portion 121 to resonate with the resonant frequency (2500 to 2700 MHz) of the operating band 5.

In addition, as shown in FIG. 3, in another embodiment of the present invention, a conductive switch 80 may be further added to the mobile communication device 1. The conductive switch 80 may be a diode or a relay, and one end of the conductive switch 80 is connected to the ground 30. The other end is connected to the second connecting member 42 of the grounding path conductor 40. When the conductive switch 80 is not turned on, the resonant path is long, and the bandwidth of the LTE 700 application band (about 700 to 800 MHz) can be generated. When the conductive switch 80 is turned on, the path is advanced to the ground, and the resonant path is shortened. The original LTE 700 application band is used. The bandwidth is adjusted to the bandwidth of the GSM850 and EGSM900 application bands (850~900 MHz). In other words, the conductive switch 80 can be used here to adjust the length of the low frequency resonant path to adjust the desired bandwidth range.

As can be seen from the above description, the mobile communication device 1 having the antenna of the present invention can utilize a part of the metal back cover 12 as a part of the radiating unit of the antenna, and since the present invention adopts an antenna type that couples resonance, it is compared with The PIFA antenna architecture can generate a low frequency bandwidth and greatly reduce the space required for the radiating element to be placed in the device, which makes the body thinner and lighter.

To sum up, the present invention, regardless of its purpose, means and efficacy, shows its distinctive features of the prior art. You are requested to review the examination and express the patent as soon as possible. It should be noted that the various embodiments described above are merely illustrative for ease of explanation, and the scope of the invention is intended to be limited by the scope of the claims.

1‧‧‧Mobile communication device
10‧‧‧shell
11‧‧‧ front cover
12‧‧‧Metal back cover
121‧‧‧ Radiation Department
122‧‧‧Non-radiation department
20‧‧‧Substrate
30‧‧‧ Ground plane
31‧‧‧ Main Board
32‧‧‧Extension
40‧‧‧ Grounding path conductor
41‧‧‧First connector
42‧‧‧Second connector
43‧‧‧Metal parts
50‧‧‧Feed into the antenna unit
51‧‧‧First Radiation
511‧‧‧ Third connector
512‧‧‧First Radiation Body
FP‧‧‧Feeding point
52‧‧‧Second Radiation
521‧‧‧fourth connector
522‧‧‧Second Radiation Body
60‧‧‧Separate block
70‧‧‧radiation conductor
80‧‧‧conductive switch
90‧‧‧ gap
U‧‧‧Universal Sequence Bus Connections埠
AJ‧‧‧Audio socket
SP‧‧‧Speaker

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partial exploded view of the mobile communication device of the present invention. 2 is a top plan view of the inner side surface of the metal back cover of the housing of the mobile communication device of the present invention. Figure 3 is a top plan view of the inside surface of the front cover of the housing of the mobile communication device of the present invention. Figure 4 is a side cross-sectional view of the mobile communication device of the present invention. Fig. 5 is a graph showing the results of voltage standing wave ratio (VSWR) measurement by an antenna provided in the mobile communication device of the present invention.

1‧‧‧Mobile communication device

10‧‧‧shell

11‧‧‧ front cover

12‧‧‧Metal back cover

20‧‧‧Substrate

30‧‧‧ Ground plane

31‧‧‧ Main Board

32‧‧‧Extension

40‧‧‧ Grounding path conductor

41‧‧‧First connector

42‧‧‧Second connector

43‧‧‧Metal parts

50‧‧‧Feed into the antenna unit

51‧‧‧First Radiation

511‧‧‧ Third connector

512‧‧‧First Radiation Body

FP‧‧‧Feeding point

52‧‧‧Second Radiation

521‧‧‧fourth connector

522‧‧‧Second Radiation Body

60‧‧‧Separate block

70‧‧‧radiation conductor

U‧‧‧Universal Sequence Bus Connections埠

AJ‧‧‧Audio socket

SP‧‧‧Speaker

Claims (7)

A mobile communication device having an antenna, comprising: a casing, comprising a metal back cover, the metal back cover comprising a radiating portion and a non-radiating portion, the radiating portion being electrically isolated from the non-radiating portion; a substrate, being disposed Inside the housing; a grounding surface is located inside the housing; a grounding path conductor having one end connected to the radiating portion and the other end connected to the grounding surface; and a feeding antenna unit comprising: a first radiating element Provided on the substrate, one end of the first radiating member is a feeding point of the antenna; a second radiating member is disposed between the radiating portion and the substrate, and the second radiating member is connected to the first radiation And a spacing from the radiating portion; and a radiation conductor disposed on the substrate and having one end connected to the ground plane; the radiating conductor is capacitively coupled by the feeding antenna unit to generate a resonant mode Thereby, the radiating portion is excited by the feeding antenna unit by capacitive coupling, so that the radiating portion resonates with the feeding antenna unit to generate a lowest frequency resonant mode and a higher order resonant mode. The mobile communication device of claim 1, further comprising a partitioning block disposed between the second radiating member and the radiating portion for attaching the second radiating member. The mobile communication device of claim 1, further comprising a conductive switch, one end of the conductive switch being connected to the ground plane, and the other end of the conductive switch being connected to the ground path conductor. The mobile communication device of claim 4, wherein the lowest frequency resonant mode has a bandwidth covering 704 to 960 MHz, and the high-order resonant mode and the resonant mode synthesized bandwidth cover 1575 to 2700 MHz. The mobile communication device of claim 1, wherein the distance is substantially 2 millimeters (mm). The mobile communication device of claim 1, wherein the metal back cover has a thickness of substantially 1 millimeter (mm). The mobile communication device of claim 1, wherein the ground plane is a system ground plane of the mobile communication device.