TWI626791B - Wearable communication device - Google Patents

Abstract

A wearable communication device includes a shoe body structure, a grounding element and an antenna element. The shoe body structure includes a tongue. The grounding element is placed on the tongue. The antenna element is disposed on the tongue and adjacent an edge of the ground element. The antenna element operates in a first frequency band and the length of the ground element is not less than 1/4 wavelength of the lowest frequency of the first frequency band.

Description

Wearable communication device

The present invention relates to a communication device, and more particularly to a wearable communication device.

With the rapid development of mobile communication technology, various international manufacturers have begun to develop wearable communication devices. For example, with the prevalence of roads and the development of home, health and child care, smart shoes have gradually attracted attention in recent years, and can be used to control people's positioning information, physiological parameters and road running information. The overall environment of the wearable communication device (such as: design, antenna space, ground plane size and antenna environment) is far from the current handheld device. Therefore, the wearable communication device must have different design thinking in antenna design. And application technology.

Taking smart shoes as an example, most of the existing smart shoes use modular antennas directly, and the modular antennas are placed in the sole or insole together with the grounding surface. However, the above approach only focuses on the system integration of smart shoes, ignoring the impact of the human body on the antenna elements. Therefore, the communication quality of the existing smart shoes is often poor, and even the situation of positioning distortion or failure may occur.

The present invention provides a wearable communication device comprising a grounding element and an antenna element disposed in a tongue of a shoe body structure, thereby contributing to improving the communication quality of the wearable communication device.

The wearable communication device of the present invention comprises a shoe body structure, a grounding element and an antenna element. The shoe body structure includes a tongue. The grounding element is placed on the tongue. The antenna element is disposed on the tongue and adjacent an edge of the ground element. Furthermore, the antenna element operates in the first frequency band and the length of the ground element is not less than 1/4 wavelength of the lowest frequency of the first frequency band.

In an embodiment of the invention, the antenna element and the grounding element are disposed on the substrate, and the substrate is embedded in the tongue.

Based on the above, the wearable communication device of the present invention includes a shoe body structure, and the grounding member and the antenna member are tongues disposed on the shoe body structure. Thereby, the influence of the surrounding environment or the human body on the antenna element and the grounding element can be effectively reduced, thereby contributing to the improvement of the communication quality of the wearable communication device.

The above described features and advantages of the invention will be apparent from the following description.

1 is a schematic diagram of a wearable communication device in accordance with an embodiment of the present invention. As shown in FIG. 1, the wearable communication device 100 can be, for example, a smart shoe. Specifically, the wearable communication device 100 includes a shoe body structure 110, and the shoe body structure 110 includes a tongue 111, a shoe body 112, a toe cap 113, a lace hole 114, and a shoe opening 115. In addition, the wearable communication device 100 further includes an antenna element 120 and a ground element 130.

The antenna element 120 and the ground element 130 are disposed on the tongue 111, and the antenna element 120 is adjacent to an edge of the ground element 130. For example, the wearable communication device 100 further includes a substrate 140. The antenna element 120 and the ground element 130 are disposed on a surface of the substrate 140, and the substrate 140 can be embedded in the tongue 111. In other words, the antenna element 120, the ground element 130, and the substrate 140 may be disposed within the sandwich space of the tongue 111. In addition, the substrate 140 can be, for example, a flexible printed circuit board that can be bent in conformity with the surface of the foot of the human body such that the tongue 111 can be attached to the surface of the foot of the human body.

The antenna element 120 is operable in a first frequency band and the length of the ground element 130 is not less than (i.e., greater than or equal to) a quarter wavelength of the lowest frequency of the first frequency band. Thereby, miniaturization of the antenna element 120 will be facilitated. Also. When the user puts on the wearable communication device 100, the tongue 111 is positioned above the foot of the human body, that is, the foot of the human body does not obscure the antenna element 120 and the grounding element 130 disposed in the tongue 111. Thereby, the antenna element 120 and the grounding element 130 can be prevented from being affected by the human body, and the influence of the surrounding environment on the antenna element 120 and the grounding element 130 can be reduced, thereby contributing to improving the communication quality of the wearable communication device 100. .

For example, the first frequency band covered by the antenna element 120 can be, for example, the 1.57542 GHz band used by the global positioning system (GPS). In addition, the antenna element 120 disposed in the tongue 111 will facilitate the wearable communication device 100 to receive satellite signals from GPS in the sky, thereby preventing the wearable communication device 100 from being in a positional distortion or failure condition. Moreover, the antenna element 120 and the grounding element 130 disposed in the tongue 111 are also less susceptible to the surrounding environment, thereby improving the stability of the communication quality of the wearable communication device 100. In contrast, as the stability of the communication quality is improved, the wearable communication device 100 does not need to additionally provide matching circuits or matching components, thereby contributing to reducing the production cost of the wearable communication device 100.

Furthermore, the wearable communication device 100 further includes a radio frequency circuit 150 and a battery 160. The RF circuit 150 and the battery 160 are disposed on the substrate 140. That is, the RF circuit 150 and the battery 160 may also be disposed in the sandwich space of the tongue 111. In addition, the RF circuit 150 can be electrically connected to the feed point of the antenna element 120 through a coaxial cable to provide a signal to the antenna element 120 or receive a signal from the antenna element 120. Battery 160 can be used to provide the power required by wearable communication device 100. For example, battery 160 can provide an operating voltage to radio frequency circuit 150.

2 and 3 are schematic views of antenna elements in accordance with an embodiment of the present invention, and the structure and operation of the antenna element 120 will be further described below with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, the antenna element 120 includes a first radiating portion 210, a feeding portion 220, and a second radiating portion 230. The first end of the feeding portion 220 has a feeding point FP2, and the second end of the feeding portion 220 is electrically connected to the first radiating portion 210.

It is worth mentioning that the feeding portion 220 and the first radiating portion 210 can form a patch antenna structure, and the antenna element 120 can operate in the first frequency band through the patch antenna structure. Specifically, the first radiating portion 210 may be, for example, a square metal piece. In addition, since the length of the grounding element 130 is not less than 1/4 wavelength of the lowest frequency of the first frequency band, the side length 201 of the first radiating portion 210 (ie, the square metal piece) may be smaller than the lowest frequency of the first frequency band. /2 wavelength, thereby contributing to miniaturization of the antenna element 120. For example, in one embodiment, the side length 201 of the first radiating portion 210 (ie, the square metal piece) may be about 1/6 to 1/8 wavelength of the lowest frequency of the first frequency band. For example, the first frequency band can be, for example, the 1.57542 GHz frequency band, and the side length 201 of the first radiating portion 210 (ie, the square metal piece) can be, for example, 23 millimeters (mm).

With continued reference to FIG. 3, the first radiating portion 210 (ie, the square metal piece) includes the first portion 310 and the second portion 320 that are electrically connected. That is, the first radiating portion 210 (that is, the square metal piece) may be divided into the first portion 310 and the second portion 320 based on the feeding portion 220. The first portion 310 includes an adjacent first edge SD31 and a second edge SD32. The first edge SD31 of the first portion 310 is electrically connected to the second end of the feeding portion 220, and the second edge SD32 of the first portion 310 is electrically connected to the first end of the second radiating portion 230. In addition, the second end of the second radiating portion 230 is electrically connected to the feeding portion 220, and the second radiating portion 230 surrounds the first edge SD31 and the second edge SD32 of the first portion 310.

Thereby, as shown in FIG. 3, the second radiating portion 230, the first portion 310 and the feeding portion 220 will form a loop antenna structure, and the antenna element 120 can operate in the second frequency band through the loop antenna structure, for example: 2.45 GHz band. Specifically, the second radiating portion 230, the first portion 310 and the feeding portion 220 can form a closed slot 330, and the perimeter of the closed slot 330 is about 1/2 wavelength of the lowest frequency of the second frequency band. Further, the second radiating portion 230 may be, for example, a C-shaped metal piece to thereby surround the first edge SD31 and the second edge SD32 of the first portion 310.

4 is a diagram showing return loss of an antenna element when a wearable communication device is not placed in a human body tissue simulation fluid according to an embodiment of the present invention, and FIG. 5 is a wearable communication device placed in a human body according to an embodiment of the present invention; Return loss map of the antenna element when the simulation fluid is organized. As shown in FIG. 4 and FIG. 5, the antenna element 120 can cover the frequency range of 1.57 GHz and 2.4 GHz to 2.5 GHz without placing and placing the human tissue simulation fluid. In addition, FIG. 6 is a graph showing the radiation efficiency of the antenna element according to an embodiment of the present invention, wherein the curve 610 is the radiation efficiency of the antenna element 120 when the human tissue simulation liquid is not placed, and the curve 620 is the simulation of the implantation into the human body. The radiation efficiency of the antenna element 120 in the liquid state.

As shown in FIG. 6, the radiation efficiency of the antenna element 120 is reduced by less than 1 dB when the wearable communication device 100 is placed in the human tissue simulation fluid as compared with the case where the human tissue simulation fluid is not placed. In other words, the antenna element 120 and the grounding element 130 are disposed in the tongue 111, which can effectively reduce the influence of the surrounding environment or the human body on the antenna element 120 and the grounding element 130. Therefore, even in the case where the human body tissue simulating fluid is placed, the antenna element 120 can still maintain good radiation efficiency, thereby contributing to the improvement of the communication quality of the wearable communication device 100.

In summary, the wearable communication device of the present invention includes a shoe body structure, and the antenna element and the grounding member are the tongues disposed together in the shoe body structure. Thereby, the influence of the surrounding environment or the human body on the antenna element and the grounding element can be effectively reduced, thereby contributing to the improvement of the communication quality of the wearable communication device. Furthermore, the antenna element is operable in the first frequency band and the length of the ground element is not less than 1/4 wavelength of the lowest frequency of the first frequency band. Thereby, it will contribute to miniaturization of the antenna element.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100: wearable communication device 110: shoe body structure 111: tongue 112: shoe body 113: toe cap 114: lace hole 115: shoe mouth 120: antenna element 130: grounding element 140: substrate 150: radio frequency circuit 160: battery 210: First radiating portion 220: Feeding portion 230: Second radiating portion 201: Side length FP2: Feeding point 310: First portion 320: Second portion 330: Closed slot SD31: First edge SD32: Second edge 610 , 620: curve

1 is a schematic diagram of a wearable communication device in accordance with an embodiment of the present invention. 2 and 3 are schematic views of antenna elements in accordance with an embodiment of the present invention, respectively. 4 is a diagram showing the return loss of an antenna element when a wearable communication device is not placed in a human tissue simulation fluid according to an embodiment of the present invention. 5 is a diagram showing the return loss of an antenna element when a wearable communication device is placed in a human body tissue simulating fluid according to an embodiment of the present invention. Figure 6 is a graph showing the radiation efficiency of an antenna element in accordance with an embodiment of the present invention.

Claims (7)

A wearable communication device comprising: a shoe body structure including a tongue; a grounding member disposed on the tongue; and an antenna element disposed on the tongue and adjacent to an edge of the grounding member, wherein the The antenna element is operated in a first frequency band, and the length of the ground element is not less than 1/4 wavelength of the lowest frequency of the first frequency band, wherein the antenna element comprises: a first radiating portion, which is a square metal piece, The square metal piece includes a first portion and a second portion electrically connected to each other, a first edge of the first portion is electrically connected to the second end of the feeding portion, and a feeding portion has a feeding point at the first end thereof. The second end of the feeding portion is electrically connected to the first radiating portion, wherein the feeding portion and the first radiating portion form a patch antenna structure, and the antenna element operates in the first frequency band through the patch antenna structure And a second radiating portion, the first end of which is electrically connected to a second edge of the first portion, the second end of the second radiating portion is electrically connected to the feeding portion, and the second radiating portion surrounds the first portion The first Edge of the second edge, wherein the second radiation portion, the first portion and the feeding portion forming a loop antenna structure, the antenna element and transmitted through the loop antenna configuration in a second operating frequency band. The wearable communication device of claim 1, wherein the antenna element and the grounding element are disposed on a substrate, and the substrate is embedded in the tongue. The wearable communication device of claim 2, further comprising: a radio frequency circuit disposed on the substrate and providing a feed signal to the antenna element. The wearable communication device of claim 3, further comprising a battery, wherein the battery is disposed on the substrate and provides an operating voltage to the radio frequency circuit. The wearable communication device of claim 1, wherein the side length of the square metal piece is 1/6 to 1/8 wavelength of the lowest frequency of the first frequency band. The wearable communication device of claim 1, wherein the loop antenna structure comprises a closed slot, and the perimeter of the closed slot is 1/2 wavelength of the lowest frequency of the second frequency band. The wearable communication device of claim 1, wherein the second radiating portion is a C-shaped metal piece.