TW201424118A - Mobile device and control method thereof - Google Patents

Abstract

A mobile device includes a dielectric substrate, a ground plane, a tunable antenna, and a switch. The tunable antenna includes a feeding element, a first parasitic element, and a second parasitic element. The feeding element includes a first segment and a second segment, and a signal source is coupled to a junction of the first segment and the second segment. A first coupling gap is formed between the first segment of the feeding element and the first parasitic element. A second coupling gap is formed between the second segment of the feeding element and the second parasitic element. The switch selectively couples either the first parasitic element or the second parasitic element to the ground plane.

Description

Mobile device and control method thereof

The present invention relates to a mobile device, and more particularly to a mobile device and its adjustable antenna.

At present, the smart phone has listed the Global Positioning System (GPS) as one of the basic functions, and the characteristics of the GPS antenna play a pivotal role in the GPS receiving performance of the mobile phone. In the early functional phones, circularly polarized ceramic antennas were used as GPS antennas. However, since the current space of smart phones is insufficient to place the above circularly polarized ceramic antennas, they are almost all changed to general linear polarization antennas.

In order to increase the speed of mobile phone and satellite positioning, the antenna antenna should be oriented as far as possible to the antenna when designing the GPS antenna to facilitate the reception of signals. Most smart phones will have a GPS antenna at the top of the phone. However, the use of the smart phone device is not limited to the Portrait mode usage mode, but can also be rotated to the Landscape mode usage mode. As a result, the GPS antenna's original field orientation will change, which will affect the speed of mobile phone and satellite positioning.

In order to solve the foregoing problems, the present invention provides a mobile device comprising: a dielectric substrate; a ground plane; an adjustable antenna disposed on the dielectric substrate adjacent to the ground plane, wherein the adjustable antenna comprises: a feed The input portion includes a first segment and a second segment, wherein a signal source is coupled Connecting to one of the first section and the second section; a first parasitic portion, wherein a first coupling gap is formed between the first section of the feeding portion and the first parasitic portion; a second parasitic portion, wherein a second coupling gap is formed between the second portion of the feeding portion and the second parasitic portion; and a switch selectively coupling the first parasitic portion or the second portion The parasitic part to the ground plane.

In addition, the present invention provides a control method for controlling a mobile device, wherein the mobile device includes a dielectric substrate, a ground plane, an adjustable antenna, and a switch, the adjustable antenna includes a feed portion, a first a parasitic portion, and a second parasitic portion, the feeding portion includes a first segment and a second segment, and a signal source is coupled to the junction of the first segment and the second segment. A first coupling gap is formed between the first segment and the first parasitic portion, and a second coupling gap is formed between the second segment and the second parasitic portion, and the control method comprises the following steps: a sensor for detecting whether a display mode of the mobile device is changed; if so, generating a detection signal by the sensor; and determining, by the processor, the current pendulum according to the detection signal a mode of discharging; and controlling, by the processor, the switch to couple the first parasitic portion or the second parasitic portion to the ground plane to adjust a radiation pattern of the adjustable antenna.

In order to make the objects, features and advantages of the present invention more comprehensible, the specific embodiments of the invention are set forth in the accompanying drawings.

Figure 1 is a diagram showing a mobile device according to an embodiment of the present invention. Schematic diagram of 100. The mobile device 100 can be a smart phone or a tablet computer. As shown in FIG. 1 , the mobile device 100 includes a dielectric substrate 110 , a ground plane 120 , an adjustable antenna 130 , and a switch 170 . The dielectric substrate 110 can be a system circuit board, an FR4 substrate, or a Flexible Printed Circuit Board (FPCB). The ground plane 120 and the adjustable antenna 130 may be disposed on the dielectric substrate 110. The adjustable antenna 130 is disposed adjacent to the ground plane 120. Both the ground plane 120 and the adjustable antenna 130 can be made of metal, such as silver, copper, or aluminum. In some embodiments, the mobile device 100 may further include other necessary components, such as a display, a touch module, a battery, and a casing (not shown).

The adjustable antenna 130 includes a feed portion 140, a first parasitic portion 150, and a second parasitic portion 160. The first parasitic portion 150 and the second parasitic portion 160 are separated from the feeding portion 140. In some embodiments, the adjustable antenna 130 is disposed at one corner of the dielectric substrate 110, and the first parasitic portion 150 and the second parasitic portion 160 are respectively located at two vertical edges of the dielectric substrate 110. The feed portion 140 includes a first section 141 and a second section 142, wherein a signal source 190 is coupled to one of the first section 141 and the second section 142. In more detail, the feeding portion 140 may be substantially an L shape, and the signal source 190 is coupled to one of the vertical bends of the L shape. On the other hand, the first parasitic portion 150 and the second parasitic portion 160 may each be substantially an L-shape, an I-shape, or other shapes. In some embodiments, the first section 141 of the feed portion 140 is substantially parallel to the first parasitic portion 150 and the second portion 142 of the feed portion 140 is substantially parallel to the second parasitic portion 160. The first section 141 of the feeding portion 140 and the first parasitic portion 150 A first coupling gap G1 is formed therebetween, and a second coupling gap G2 is formed between the second section 142 of the feeding portion 140 and the second parasitic portion 160. In some embodiments, the width of the first coupling gap G1 and the width of the second coupling gap G2 should both be less than 2 mm. The switch 170 selectively couples the first parasitic portion 150 or the second parasitic portion 160 to the ground plane 120. In other words, if the first parasitic portion 150 is coupled to the ground plane 120, the second parasitic portion 160 will maintain an open state; and if the second parasitic portion 160 is coupled to the ground plane 120, the first parasitic portion 150 will maintain one Open circuit status.

2 is a schematic diagram showing a mobile device 200 in accordance with a preferred embodiment of the present invention. Figure 2 is similar to Figure 1. In this embodiment, the mobile device 200 further includes a sensor 182, a processor 184, a radio frequency module 186, a first inductor L1, and a second inductor L2. The RF module 186 can be considered as the signal source 190 in FIG. The RF module 186 is coupled to the junction of the first section 141 and the second section 142 of the feed portion 140 to excite the adjustable antenna 130. The first inductor L1 is coupled in series to the first parasitic portion 150 , and the second inductor L2 is coupled in series to the second parasitic portion 160 . The first inductor L1 and the second inductor L2 may be wafer inductors for shortening the resonant path length of the adjustable antenna 130, thereby reducing the overall size of the adjustable antenna 130. However, the first inductor L1 and the second inductor L2 are not essential components of the invention and may be removed in other embodiments.

In some embodiments, the sensor 182 is a gravity sensor (G-sensor) or a linear accelerometer. The sensor 182 is configured to detect whether the placement mode of one of the mobile devices 200 is changed. For example, the placement mode can be changed from Portrait mode to a horizontal mode. The landscape mode is changed from the horizontal mode to the upright mode. If the placement mode of the mobile device 200 changes, the sensor 182 generates a detection signal S1. The processor 184 determines the current display mode according to the detection signal S1, and controls the switch 170 to couple the first parasitic portion 150 or the second parasitic portion 160 to the ground plane 120 to adjust the radiation field of the adjustable antenna 130. type.

FIG. 3A is a schematic diagram showing the mobile device 200 in the upright mode according to an embodiment of the invention. FIG. 3B is a schematic diagram showing the mobile device 200 in the horizontal mode according to an embodiment of the invention. To simplify the drawing, Figures 3A, 3B do not show all of the components of the mobile device 200. In the preferred embodiment, the adjustable antenna 130 is a GPS (Global Positioning System, GPS) antenna, and the radiation pattern of the GPS antenna should be aligned with the sky. In the embodiment of FIG. 3A, if the processor 184 determines that the placement mode is the upright mode, the processor 184 controls the switch 170 to couple the second parasitic portion 160 to the ground plane 120. In the embodiment of FIG. 3B, if the processor 184 determines that the placement mode is the horizontal mode, the processor 184 controls the switch 170 to couple the first parasitic portion 150 to the ground plane 120. In some embodiments, one of the grounded parasitic portions is disposed generally toward a sky direction, and the other parasitic portion that is not grounded is disposed substantially in a horizontal direction. By controlling the switch 170 to switch between the first parasitic portion 150 and the second parasitic portion 160, the mobile device 200 can easily adjust the radiation pattern of the adjustable antenna 130 and control the radiation field to be constantly aligned. The direction of the sky. Therefore, the mobile device 200 of the present invention and its adjustable antenna 130 will have good communication quality.

Figure 4 is a diagram showing a mobile device according to an embodiment of the present invention. A Return Loss diagram of the adjustable antenna 130 of 200. Curve CC1 represents the return loss of the adjustable antenna 130 when the second parasitic portion 160 is coupled to the ground plane 120; and the curve CC2 represents when the first parasitic portion 150 is coupled to the ground plane 120 (horizontal mode) Return loss of the adjustable antenna 130. As shown in FIG. 4, the adjustable antenna 130 can excite an operating frequency band FB1 regardless of whether the mobile device 200 is in the upright mode or the horizontal mode. In the preferred embodiment, the operating band FB1 is between about 1565 MHz and 1585 MHz and may encompass a GPS band.

Figure 5 is a diagram showing the antenna efficiency of the adjustable antenna 130 of the mobile device 200 according to an embodiment of the present invention. The curve CC3 represents the antenna efficiency of the adjustable antenna 130 when the second parasitic portion 160 is coupled to the ground plane 120; and the curve CC4 represents when the first parasitic portion 150 is coupled to the ground plane 120 (horizontal mode) Antenna efficiency of the tunable antenna 130. As shown in FIG. 5, the adjustable antenna 130 can have good antenna efficiency regardless of whether the mobile device 200 is in the upright mode or the horizontal mode. The antenna efficiency can reach about 46% to 56% in both modes, which can meet the needs of practical applications.

In some embodiments, the component sizes and component parameters of the mobile device 200 are as follows. The ground plane 120 has a length of about 100 mm and a width of about 60 mm. The adjustable antenna 130 has an area of approximately 150 mm ² . The first section 141 of the feed portion 140 has a length of about 10 mm and a width of about 1 mm. The second section 142 of the feed portion 140 has a length of about 10 mm and a width of about 1 mm. The first parasitic portion 150 has a length of about 16.5 mm and a width of about 1 mm. The second parasitic portion 160 has a length of about 16.5 mm and a width of about 1 mm. The width of the first coupling gap G1 is approximately 1.5 mm. The width of the second coupling gap G2 is about 1.5 mm. The inductance of the first inductor L1 is approximately 12 nH. The inductance of the second inductor L2 is about 12 nH.

It is to be noted that the above-described component sizes, component parameters, and frequency band ranges are not limitations of the present invention. Designers can adjust these component sizes, component parameters, and frequency bands to suit different needs.

Figure 6 is a flow chart showing a control method suitable for controlling one of the mobile devices according to an embodiment of the present invention. The mobile device includes a dielectric substrate, a ground plane, an adjustable antenna, and a switch. The adjustable antenna includes a feed portion, a first parasitic portion, and a second parasitic portion. The feed portion includes a first section and a second section. A signal source is coupled to one of the first segment and the second segment. A first coupling gap is formed between the first segment and the first parasitic portion. A second coupling gap is formed between the second segment and the second parasitic portion. As shown in Fig. 6, the control method includes the following steps. First, in step S610, a sensor is used to detect whether the placement mode of one of the mobile devices changes. If no, the process ends. If so, in step S620, a detection signal is generated by the sensor. In step S630, a current processor determines the placement mode based on the detection signal. Finally, in step S640, the switch is controlled to couple the first parasitic portion or the second parasitic portion to the ground plane to adjust a radiation pattern of the adjustable antenna. It must be noted that all of the features of the embodiments of Figures 1-5 can be applied to the control method of Figure 6.

The mobile device of the present invention can switch between different parasitic portions of the adjustable antenna according to its placement mode, so that the adjustable antenna can maintain the required radiation pattern. In addition, since the feeding portion of the adjustable antenna is directly coupled to The signal source, so the radiation efficiency of the adjustable antenna is hardly affected during this switching process. The present invention is applicable to a wide variety of miniaturized communication devices.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to indicate that two are identical. Different components of the name.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100, 200‧‧‧ mobile devices

110‧‧‧Media substrate

120‧‧‧ ground plane

130‧‧‧Adjustable antenna

140‧‧‧Feeding Department

141‧‧The first section of the feeding department

142‧‧The second section of the feeding department

150‧‧‧The first parasitic part

160‧‧‧Second parasitic

170‧‧‧Switcher

182‧‧‧ sensor

184‧‧‧ processor

186‧‧‧RF Module

190‧‧‧Signal source

CC1, CC2, CC3, CC4‧‧‧ curves

FB1‧‧‧ operating band

G1‧‧‧First coupling gap

G2‧‧‧Second coupling gap

L1‧‧‧First Inductor

L2‧‧‧second inductor

S1‧‧‧Detection signal

1 is a schematic view showing a mobile device according to an embodiment of the present invention; FIG. 2 is a schematic view showing a mobile device according to a preferred embodiment of the present invention; and FIG. 3A is a view showing an embodiment of the present invention. A schematic diagram of the mobile device in an upright mode; FIG. 3B is a schematic diagram showing a mobile device in a horizontal mode according to an embodiment of the invention; and FIG. 4 is a mobile device according to an embodiment of the invention. Return loss map of the adjustable antenna; FIG. 5 is an antenna efficiency diagram of the adjustable antenna according to the mobile device according to an embodiment of the invention; FIG. 6 is a diagram showing the control of the antenna according to an embodiment of the invention. Flow chart of the control method of the mobile device.

100‧‧‧ mobile devices

110‧‧‧Media substrate

120‧‧‧ ground plane

130‧‧‧Adjustable antenna

140‧‧‧Feeding Department

141‧‧The first section of the feeding department

142‧‧The second section of the feeding department

150‧‧‧The first parasitic part

160‧‧‧Second parasitic

170‧‧‧Switcher

190‧‧‧Signal source

G1‧‧‧First coupling gap

G2‧‧‧Second coupling gap

Claims (10)

A mobile device includes: a dielectric substrate; a ground plane; an adjustable antenna disposed on the dielectric substrate adjacent to the ground plane, wherein the adjustable antenna includes: a feed portion including a first portion And a second segment, wherein a signal source is coupled to one of the first segment and the second segment; a first parasitic portion, wherein the first segment and the first portion of the feed portion Forming a first coupling gap between a parasitic portion; a second parasitic portion, wherein a second coupling gap is formed between the second portion of the feeding portion and the second parasitic portion; and a switcher, selective The first parasitic portion or the second parasitic portion is coupled to the ground plane. The mobile device of claim 1, further comprising: a sensor for detecting whether a display mode of the mobile device is changed, and if so, generating a detection signal; and a processor, Determining the current display mode according to the detection signal, and controlling the switch to couple the first parasitic portion or the second parasitic portion to the ground plane to adjust a radiation pattern of the adjustable antenna; The placement mode of the mobile device includes an upright mode and a horizontal mode. The mobile device of claim 1, wherein the feeding portion is substantially in an L shape, and the signal source is coupled to one of the vertical bends of the L-shaped shape. The mobile device of claim 1, wherein the first parasitic portion and the second parasitic portion are each substantially L-shaped. The mobile device of claim 1, further comprising: a first inductor coupled in series to the first parasitic portion; and a second inductor coupled in series to the second parasitic portion. The mobile device of claim 1, wherein the adjustable antenna is disposed at a corner of the dielectric substrate, and the first parasitic portion and the second parasitic portion are respectively located at a vertical of the dielectric substrate At the edge. The mobile device of claim 1, wherein the width of the first coupling gap and the width of the second coupling gap are both less than 2 mm. The mobile device of claim 1, wherein the adjustable antenna is activated to generate an operating frequency band that is between about 1565 MHz and 1585 MHz. A control method for controlling a mobile device, wherein the mobile device includes a dielectric substrate, a ground plane, an adjustable antenna, and a switch, the adjustable antenna including a feed portion, a first parasitic portion, and a second parasitic portion, the feed portion includes a first segment and a second segment, and a signal source is coupled to the junction of the first segment and the second segment, the first segment Forming a first coupling gap with the first parasitic portion, and forming a second coupling gap between the second segment and the second parasitic portion, and the controlling method includes the following steps: by using a sensor, Detecting whether the placement mode of one of the mobile devices changes; If yes, generating a detection signal by using the sensor; determining, by the processor, the current placement mode according to the detection signal; and controlling, by the processor, the switch to couple the first a parasitic portion or the second parasitic portion to the ground plane to adjust a radiation pattern of the adjustable antenna. The control method of claim 9, wherein the placement mode of the mobile device comprises an upright mode and a horizontal mode.