CN212783796U - Multiband antenna and wearable device - Google Patents

Abstract

The application discloses multiband antenna and dress device, multiband antenna includes mainboard, irradiator, tunable capacitance module and tunable switch module. The mainboard is provided with a feed point, a first feed point and a second feed point, the radiator is configured to be a part of a metal frame of the wearable device and coupled with the feed point, the metal frame is configured to surround the mainboard, a gap is formed between the metal frame and the mainboard, and the tunable capacitor module and the tunable switch module are arranged in the metal frame. The multi-band antenna utilizes an aperture tuning principle to control at least one coupling radiator in a plurality of capacitors of the tunable capacitor module and the first feed point, and to control at least one coupling radiator in a plurality of switch channels of the tunable switch module and the second feed point, so as to generate different working frequency bands. Therefore, the receiving quality of the multiband antenna is not influenced by the design of the metal frame of the wearable device, so that the wearable device has both attractive appearance and communication performance.

Description

Multiband antenna and wearable device

Technical Field

The present application relates to the field of antennas, and in particular, to a multiband antenna and a wearable device using the same.

Background

With the advancement of technology, various wearable devices have been developed, such as: intelligent wrist-watch, intelligent bracelet, intelligent earphone or other dress devices. Wearing devices carry more and more functions in order to meet the needs of people, for example: functions such as pedometry, heart rate measurement, satellite positioning, independent call, video chat, etc., and therefore, components for performing various functions and an antenna for receiving wireless signals need to be disposed in a limited space of the wearable device.

Meanwhile, in order to pursue light, thin and fashionable appearance and improve mechanism strength, more and more wearing devices preferentially adopt a metal frame, but the metal frame can reflect wireless signals transmitted and received by the antenna, so that the transmission of the wireless signals is influenced, the receiving of a user is poor, and the experience is poor.

SUMMERY OF THE UTILITY MODEL

The main objective of this application is to provide a multiband antenna and dress device, solve prior art, dress the device and seriously influence its antenna reception quality's problem because of the metal frame design.

In order to achieve the above object, the present application is realized by:

the embodiment of the application provides a multiband antenna, is applied to and dresses the device, it has the metal frame to dress the device, multiband antenna includes: the device comprises a mainboard, a radiator, a tunable capacitor module and a tunable switch module. The mainboard is provided with a feeding point, a first feeding point and a second feeding point. The radiator is configured as a part of the metal frame of the wearable device, the metal frame is configured to surround the motherboard and a gap is provided between the metal frame and the motherboard, wherein the radiator is coupled to the feeding point. The tunable capacitor module is disposed in the metal frame, and includes M capacitors, at least one of the M capacitors is optionally coupled to the radiator and the first feed point, where M is a positive integer greater than or equal to 2. The tunable switch module is disposed in the metal frame, and the tunable switch module includes N switch channels, at least one of the N switch channels is selectively coupled to the radiator and the second feed point, where N is a positive integer greater than or equal to 2. Wherein at least one of the M capacitors coupling the first feed point and the radiator and at least one of the N switch channels coupling the second feed point and the radiator are used to tune the multi-band antenna to generate an operating frequency band of the multi-band antenna.

Embodiments of the present application provide a wearable device including the multiband antenna as provided in embodiments of the present application.

In the embodiment of the present application, the metal frame of the wearable device is used as the radiator of the multiband antenna, so that the receiving quality of the multiband antenna is not affected by the design of the metal frame, and the wearable device has both aesthetic appearance and communication performance. In addition, the multi-band antenna can utilize an aperture tuning principle to control the tunable capacitance module and the tunable switch module to generate a plurality of different operating frequency bands, so that the multi-band antenna meets the multi-band functional requirements.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a top view of an embodiment of a multi-band antenna of the present application;

fig. 2 is a schematic diagram of an embodiment of a wearable device of the present application employing the multi-band antenna of fig. 1.

Fig. 3 is a partial enlarged view of the multi-band antenna of fig. 1;

fig. 4 is another enlarged view of a portion of the multi-band antenna of fig. 1;

fig. 5A and 5B are graphs of frequency-Return Loss (Return Loss) for various embodiments of the multi-band antenna of fig. 1;

FIGS. 6A and 6B are graphs of frequency versus antenna efficiency for various embodiments of the multi-band antenna of FIG. 1; and

fig. 7 is a top view of another embodiment of a multi-band antenna of the present application.

Detailed Description

Embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or similar components or process flows.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, method steps, operations, components, and/or components, but do not preclude the presence or addition of further features, values, method steps, operations, components, and/or groups thereof.

The use of words such as "first," "second," "third," etc. herein is used to modify a claimed element and is not intended to imply a priority order, precedence relationship, or order between elements or steps of a method or process.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is described as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

Referring to fig. 1 and 2, fig. 1 is a top view of an embodiment of a multiband antenna according to the present application, and fig. 2 is a schematic diagram of an embodiment of a wearable device according to the present application, to which the multiband antenna according to fig. 1 is applied. As shown, the present embodiment provides a multiband antenna 100, which can be applied to the wearable device 200 of fig. 2, and the wearable device 200 can have a metal frame 210.

The wearable device 200 may be any type of wearable electronic device, such as: glasses type electronic devices, wrist-worn type electronic devices, and the like; the metal frame 210 of the wearable device 200 may have any shape, such as: circular, rectangular, polygonal or elliptical with five or more sides, etc.; in this embodiment, the wearable device 200 may be a wrist-worn electronic device, and the metal frame 210 has a rectangular shape.

In the present embodiment, the multiband antenna 100 includes: a motherboard 110, a radiator 120, a tunable capacitance module 130, and a tunable switch module 140.

The main board 110 is provided with a feeding point 50, a first feeding point 60 and a second feeding point 62. The main board 110 may be a printed circuit board, a display panel, or other conductive board of the wearable device 200.

The radiator 120 is configured as a portion of the metal bezel 210 of the wearable device 200, the metal bezel 210 is configured to surround the motherboard 110 and a gap 80 is provided between the metal bezel 210 and the motherboard 110, wherein the radiator 120 is coupled to the feeding point 50. That is, the metal frame 210 may be divided into at least two segments, and one segment of the metal frame serves as the radiator 120; in this embodiment, the metal bezel 210 may be divided into two segments, a first segment is the radiator 120, a second segment is the bezel assembly 90 (as shown in fig. 1), a first broken line 92 and a second broken line 94 are respectively disposed between two opposite ends of the radiator 120 and two opposite ends of another portion of the metal bezel (i.e., the bezel assembly 90), and the first broken line 92 and the second broken line 94 are filled with a non-metal material to form the metal bezel 210 surrounding the motherboard 110, but this embodiment is not limited to the present application. In this embodiment, the metal bezel 210 surrounds the main board 110 and the shape of the metal bezel 210 is rectangular, so that the main board 110 may be rectangular; the radiator 120 is coupled to the board 110.

Referring to fig. 1 and 3, fig. 3 is a partially enlarged view of the multi-band antenna of fig. 1. As shown in the figure, the tunable capacitor module 130 in this embodiment is disposed in the metal frame 210, and the tunable capacitor module 130 may include M capacitors (for example, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and a capacitor C6), where at least one of the M capacitors is optionally coupled to the radiator 120 and the first ground feed point 60, where M is a positive integer greater than or equal to 2. In more detail, each of the capacitances (e.g., capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5, and capacitance C6) of the tunable capacitance module 130 may be selectively coupled to the first feed point 60 by one switch assembly 20 connected thereto; the capacitance value of each capacitor (i.e., capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, and capacitor C6) may be different. In this embodiment, M may be 6, the capacitance value of the capacitor C1 may be 0.75 picofarad (pF), the capacitance value of the capacitor C2 may be 0.5 picofarad (pF), the capacitance value of the capacitor C3 may be 1.7 picofarad (pF), the capacitance value of the capacitor C4 may be 1 picofarad (pF), the capacitance value of the capacitor C5 may be 2.5 picofarad (pF), and the capacitance value of the capacitor C6 may be 3.5 picofarad (pF).

Referring to fig. 1 and 4, fig. 4 is an enlarged view of another portion of the multi-band antenna of fig. 1. As shown in the drawings, the tunable switch module 140 in this embodiment is disposed in the metal frame 210, and the tunable switch module 140 includes N switch channels 40, where at least one of the N switch channels 40 is optionally coupled to the radiator 120 and the second feed point 62, where N is a positive integer greater than or equal to 2. In more detail, each switch channel 40 of the tunable capacitance module 130 may include a switch assembly 22 and an electronic component connected to each other, the electronic component of each switch channel 40 may be selectively coupled to the second feed point 62 through the switch assembly 20 connected thereto, and the electronic component may be a resistor R1, an inductor (L1 or L2), or a capacitor C7 (i.e., the N switch channels 40 include resistors, inductors, or capacitors). In this embodiment, N may be 4, the resistance of the resistor R1 may be zero ohm, the inductance of the inductor L1 may be 3 nanohenries (nH), the inductance of the inductor L2 may be 1 nanohenries (nH), and the capacitance of the capacitor C7 may be 0.3 picofarads (pF).

Wherein at least one of the M capacitors coupling the first feed point 60 and the radiator 120 and at least one of the N switch channels 40 coupling the second feed point 62 and the radiator 120 are used to tune the multi-band antenna 100 to generate an operating frequency band for the multi-band antenna 100. That is, the multi-band antenna 100 may utilize the aperture tuning principle to control the tunable capacitor module 130 and the tunable switch module 140 (i.e., to control which capacitor or capacitors are coupled to the first feed point 60 and the radiator 120 and to control which switch channel or channels 40 are coupled to the second feed point 62 and the radiator 120) to generate a plurality of different operating frequency bands, so that the multi-band antenna 100 meets the communication application requirements corresponding to different frequencies.

Referring to fig. 5A and 5B, fig. 5A and 5B are graphs of frequency-Return Loss (Return Loss) for various embodiments of the multi-band antenna of fig. 1. In fig. 5A, the solid line is the frequency-return loss curve for multi-band antenna 100 when capacitor C6(3.5 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarads (pF)) in tunable switch module 140 is coupled to second feed point 62; the long dashed line is the frequency-return loss curve for multi-band antenna 100 when capacitor C5(2.5 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarads (pF)) in tunable switch module 140 is coupled to second feed point 62; the short dashed line is the frequency-return loss curve for multi-band antenna 100 when capacitor C3(1.7 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarads (pF)) in tunable switch module 140 is coupled to second feed point 62; a chain of points is a frequency-return loss curve for multi-band antenna 100 when capacitor C4(1 picofarad (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarad (pF)) in tunable switch module 140 is coupled to second feed point 62; the dotted line is the frequency-return loss curve for multi-band antenna 100 when capacitor C2(0.5 picofarad (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarad (pF)) in tunable switch module 140 is coupled to second feed point 62. In fig. 5B, the solid line is the frequency-return loss curve for multi-band antenna 100 when capacitor C1(0.75 picofarad (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and inductor L1(3 nanohenries (nH)) in tunable switch module 140 is coupled to second feed point 62; the dashed line is the frequency-return loss curve for multi-band antenna 100 when capacitor C1(0.75 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and inductor L2(1 nanohenry (nH)) in tunable switch module 140 is coupled to second feed point 62. As can be seen from fig. 5A and 5B, the multi-band antenna 100 has a return loss lower than-3 gain (dB) in the first frequency band (between 700MHz and 960MHz, corresponding to the low frequency band (low band) of LTE) and the second frequency band (between 1500MHz and 2700MHz, corresponding to the mid band (mid band) of GPS/Wi-Fi/LTE)/high frequency band (high band) of LTE), and has a better return loss performance.

Referring to fig. 6A and 6B, frequency versus antenna efficiency plots for various embodiments of the multi-band antenna of fig. 1. In fig. 6A, the solid line is the frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C6(3.5 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarads (pF)) in tunable switch module 140 is coupled to second feed point 62; the long dashed line is the frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C5(2.5 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarads (pF)) in tunable switch module 140 is coupled to second feed point 62; the short dashed line is the frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C3(1.7 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarads (pF)) in tunable switch module 140 is coupled to second feed point 62; a chain of points is a frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C4(1 picofarad (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarad (pF)) in tunable switch module 140 is coupled to second feed point 62; the dotted line is the frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C2(0.5 picofarad (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and capacitor C7(0.3 picofarad (pF)) in tunable switch module 140 is coupled to second feed point 62. In fig. 6B, the solid line is the frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C1(0.75 picofarad (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and inductor L1(3 nanohenries (nH)) in tunable switch module 140 is coupled to second feed point 62; the dashed line is the frequency-antenna efficiency curve for multi-band antenna 100 when capacitor C1(0.75 picofarads (pF)) in tunable capacitor module 130 is coupled to first feed point 60 and inductor L2(1 nanohenry (nH)) in tunable switch module 140 is coupled to second feed point 62. As can be seen from fig. 6A and 6B, the antenna efficiency of the multiband antenna 100 is higher than-15 gain (dB) in the first frequency band (between 700MHz and 960MHz, corresponding to LTE low band), and higher than-5 gain (dB) in the second frequency band (between 1500MHz and 2700MHz, corresponding to GPS/Wi-Fi/LTE mid band/LTE high band), respectively, thereby having good antenna efficiency. In addition, as shown in fig. 5A, 5B, 6A, and 6B, the multiband antenna realizes coverage of frequency bands such as LTE/Wi-Fi/GPS, and satisfies various communication functions.

It should be noted that although the multi-band antenna 100 generates a plurality of different operating frequency bands, in order to avoid the complexity of the diagrams of fig. 5A, 5B, 6A and 6B, the antenna efficiency and return loss are plotted for only a few operating frequency bands.

To control the tunable capacitance module 130 and the tunable switch module 140 using the aperture tuning principle, the multi-band antenna 100 may further include a control module 150 disposed in the metal bezel 210, the control module 150 may be coupled to the tunable capacitance module 130 and the tunable switch module 140, and the control module 150 is configured to control at least one of the M capacitors to be coupled to the radiator 120 and the first feed point 60 and control at least one of the N switch channels 40 to be coupled to the radiator 120 and the second feed point 62. The control module 150 may be disposed on the main board 110.

Referring to fig. 1, in an embodiment, the main board 110 may further include a third ground feeding point 64, and the multi-band antenna 100 may further include a zero-ohm resistor 70 disposed in the metal frame 210, where the zero-ohm resistor 70 is coupled to the radiator 120 and the third ground feeding point 64. In some embodiments, the zero ohm resistor 70 may be replaced with a resistor having a resistance value (i.e., the resistance value is not zero ohms) for use as an adaptation of the multi-band antenna 100.

In an embodiment, the board 110 may further include a fourth feeding point 66, and the multi-band antenna 100 may further include a conductive element 72 disposed in the metal bezel 210, wherein the conductive element 72 couples the radiator 120 and the fourth feeding point 66. The conductive element 72 may be used to connect the radiator 120 and the board 110, and may be designed by matching with the metal bezel 210, for example: the conductive element 72 may be designed as a metal spring or a metal screw for matching with the metal frame 210. In some embodiments, the main board 110 may be provided with both the third feedpoint 64 and the fourth feedpoint 66 or with one of the third feedpoint 64 and the fourth feedpoint 66.

In an embodiment, the third feed point 64 may be arranged between the feed point 50 and the fourth feed point 66. In some embodiments, the fourth feed point 66 may be provided at the feed point 50 and the third feed point 64.

In some embodiments, matching electronics coupled to the radiator 120 may be added to the fourth feeding point 66, and the matching electronics may include a resistor, an inductor, or a capacitor for adjusting the impedance matching value of the multiband antenna 100, thereby achieving flexible adjustment of the antenna frequency band and coverage of multiple frequency bands.

Fig. 7 is a top view of another embodiment of a multiband antenna according to the present application. As shown, the only difference between the multi-band antenna 300 of the present embodiment and the multi-band antenna 100 of the embodiment of fig. 1 is that the radiator 320 of the multi-band antenna 300 includes a first radiating element 322 and a second radiating element 324. In more detail, the first radiating element 322 is coupled to the feeding point 50, the second radiating element 324 is vertically coupled to an end of the first radiating element 322, and at least one of the M capacitors (please refer to the foregoing embodiment) of the tunable capacitor module 130 optionally couples the first radiating element 322 and the first feeding point 60. In an embodiment, the tunable capacitance module 130 is located at the end of the first radiation element 322 coupled to the second radiation element 324, and at least one of the N switch channels of the tunable switch module 140 (please refer to the previous embodiment) optionally couples the second radiation element 324 and the second feed point 140. In one embodiment, the zero ohm resistor 70 is coupled to the first radiating element 322 and the third feed point 64, the conductive element 72 is coupled to the first radiating element 322 and the fourth feed point 66, and the third feed point 64 is disposed between the feed point 50 and the fourth feed point 66.

To sum up, this application provides a multiband antenna and dress device, through the metal frame that will dress the device as the irradiator of multiband antenna, consequently, the receiving quality of multiband antenna does not receive the design influence of metal frame for dress device can have pleasing to the eye and communication performance concurrently, solves prior art, and the problem of dress device seriously influences its antenna receiving quality because of the metal frame design. In addition, the multi-band antenna can utilize the aperture tuning principle to control the tunable capacitance module and the tunable switch module to generate a plurality of different operating frequency bands, so that the multi-band antenna meets the multi-band functional requirements.

Although the above-described elements are included in the drawings of the present application, it is not excluded that more additional elements may be used to achieve better technical results without departing from the spirit of the present application. Further, although the flow charts of the present application are executed in the specified order, the order among the steps may be modified by those skilled in the art without departing from the spirit of the present application to achieve the same effect, and therefore, the present application is not limited to use of only the order as described above. In addition, a person skilled in the art may also integrate several steps into one step, or perform more steps in sequence or in parallel besides the steps, and the application is not limited thereby.

Although the present application has been described using the above embodiments, it should be noted that these descriptions are not intended to limit the present application. Rather, this application is intended to cover such modifications and similar arrangements as would be apparent to those skilled in the art. The scope of the claims is, therefore, to be construed in the broadest manner to include all such obvious modifications and similar arrangements.

Claims (15)

1. A multiband antenna applied to a wearable device having a metal bezel, the multiband antenna comprising:

the main board is provided with a feeding point, a first feeding point and a second feeding point;

a radiator configured as a portion of the metal bezel of the wearable device, the metal bezel configured to surround the motherboard with a gap provided therebetween, wherein the radiator is coupled to the feed point;

a tunable capacitance module disposed in the metal frame, where the tunable capacitance module includes M capacitors, and at least one of the M capacitors is optionally coupled to the radiator and the first feed point, where M is a positive integer greater than or equal to 2; and

a tunable switch module disposed in the metal frame, where the tunable switch module includes N switch channels, and at least one of the N switch channels is optionally coupled to the radiator and the second feed point, where N is a positive integer greater than or equal to 2;

wherein at least one of the M capacitors coupling the first feed point and the radiator and at least one of the N switch channels coupling the second feed point and the radiator are used to tune the multi-band antenna to generate an operating frequency band of the multi-band antenna.

2. The multiband antenna of claim 1, wherein the motherboard is further configured with a third feed point, the multiband antenna further comprising a zero ohm resistor disposed within the metal bezel, the zero ohm resistor coupled to the radiator and the third feed point.

3. The multiband antenna of claim 1, wherein the motherboard is further configured with a fourth feed point, the multiband antenna further comprising a conductive element disposed within the metal bezel, the conductive element coupling the radiator and the fourth feed point.

4. The multiband antenna of claim 1, wherein the motherboard is further configured with a third feedpoint and a fourth feedpoint, the multiband antenna further comprising a zero-ohm resistor and a conductive element disposed within the metal bezel, the zero-ohm resistor coupling the radiator and the third feedpoint, the conductive element coupling the radiator and the fourth feedpoint, the third feedpoint disposed between the feedpoint and the fourth feedpoint.

5. The multiband antenna of claim 3 or 4, wherein the conductive element is a metal dome or a metal screw.

6. The multiband antenna of claim 1, further comprising a control module disposed within the metal bezel, the control module coupled to the tunable capacitance module and the tunable switch module for controlling at least one of the M capacitors to couple to the radiator and the first feed point and controlling at least one of the N switch channels to couple to the radiator and the second feed point.

7. The multiband antenna according to claim 1, wherein a first break and a second break are respectively provided between opposite ends of the radiator and opposite ends of the other portion of the metal bezel, and the first break and the second break are filled with a non-metallic material.

8. The multiband antenna of claim 1, wherein each of the N switch channels includes a switch assembly and an electronic component connected to each other, the electronic component including a resistor, an inductor, or a capacitor.

9. The multiband antenna of claim 1, wherein M is 6.

10. The multiband antenna of claim 1, wherein N is 4.

11. The multiband antenna of claim 1, wherein the radiator comprises a first radiating element and a second radiating element, the first radiating element coupled to the feed point, the second radiating element coupled perpendicularly to an end of the first radiating element, at least one of the M capacitors optionally couples the first radiating element and the first feed point, and at least one of the N switch channels optionally couples the second radiating element and the second feed point.

12. The multi-band antenna of claim 11, wherein the motherboard is further configured with a third feed point, the multi-band antenna further comprising a zero ohm resistor disposed within the metal bezel, the zero ohm resistor coupling the first radiating element and the third feed point.

13. The multi-band antenna of claim 11, wherein the motherboard is further configured with a fourth feed point, the multi-band antenna further comprising a conductive component disposed within the metal bezel, the conductive component coupling the first radiating component and the fourth feed point.

14. The multiband antenna of claim 11, wherein the motherboard is further configured with a third feed point and a fourth feed point, the multiband antenna further comprising a zero-ohm resistor and a conductive element disposed within the metal bezel, the zero-ohm resistor coupling the first radiating element and the third feed point, the conductive element coupling the first radiating element and the fourth feed point, the third feed point disposed between the feed point and the fourth feed point.

15. A wearable device, characterized in that the wearable device comprises: a multi-band antenna according to any one of claims 1 to 14.

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