TW201931672A - Communication device - Google Patents

Abstract

A communication device includes a metal mechanism element, a feeding radiation element, a tuning radiation element, and a dielectric substrate. The metal mechanism element has a closed slot. The feeding radiation element extends across the closed slot. The feeding radiation element has a feeding point. The tuning radiation element extends across the closed slot. A first end of the tuning radiation element is coupled to the metal mechanism element. A second end of the tuning radiation element is adjacent to the metal mechanism element or is coupled to the metal mechanism element. The dielectric substrate is adjacent to the metal mechanism element. The feeding radiation element and the tuning radiation element are both disposed on the dielectric substrate. An antenna structure is formed by the feeding radiation element, the tuning radiation element, and the closed slot of the metal mechanism element.

Description

Communication device

The present invention relates to a communication device, and more particularly to a communication device and an antenna structure thereof (Antenna Structure).

With the development of mobile communication technologies, mobile devices have become more and more popular in recent years, such as portable computers, mobile phones, multimedia players, and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-range wireless communication range, for example, mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz bands used for communication, and Some cover short-range wireless communication ranges, such as Wi-Fi, Bluetooth systems using 2.4GHz, 5.2GHz and 5.8GHz bands for communication.

In order to pursue a beautiful appearance, today's designers often add elements of metal components to mobile devices. However, the added metal components are likely to have a negative impact on the antennas that support wireless communication in mobile devices, thereby reducing the overall communication quality of the mobile device. Therefore, it is necessary to propose a new mobile device and antenna structure to overcome the problems faced by traditional technologies.

In a preferred embodiment, the present invention provides a communication device comprising: a metal machine member having a closed slot; a feed radiation portion extending across the closed slot, wherein the feed radiation portion has a feedthrough a adjusting portion of the radiating portion extending across the closed slot, wherein a first end of the adjusting radiating portion is coupled to the metal member, and a second end of the adjusting radiating portion is adjacent to the metal member Or coupled to the metal member; and a dielectric substrate adjacent to the metal member, wherein the feeding radiation portion and the adjusting radiation portion are disposed on the dielectric substrate; wherein the feeding radiation portion, the adjusting radiation And the closed slot of the metal component together form an antenna structure.

In some embodiments, the feed radiation portion exhibits an L shape.

In some embodiments, the conditioning radiation portion exhibits a straight strip shape.

In some embodiments, the closed slot has a straight strip shape and has a first closed end and a second closed end.

In some embodiments, the distance between the feed point and the first closed end is between 40 mm and 45 mm.

In some embodiments, the distance between the adjustment radiation portion and the second closed end is between 0.5 mm and 38 mm.

In some embodiments, the antenna structure includes a low frequency band and a high frequency band between 790 MHz and 890 MHz, and the high frequency band is between 1830 MHz and 2690 MHz.

In some embodiments, the length of the closed slot is between 0.25 times and 0.5 times the center frequency of the low frequency band.

In some embodiments, the length of the feed radiation portion is equal to the 0.25 times the wavelength of the center frequency of the high frequency band.

In some embodiments, the communication device further includes: a feed extension, wherein the first end of the feed radiation portion and the first end of the feed extension are coupled to the feed point, and The second end of one of the feed radiation portions and the second end of the feed extension portion are open ends.

In some embodiments, the combination of the feed radiation portion and the feed extension portion assumes an S-shape.

In some embodiments, the S-shape has an unequal width structure.

In some embodiments, the second projection of the feed radiation portion and the vertical projection of the second end of the feed extension on the metal member are located within the closed slot.

In some embodiments, the antenna structure includes a low frequency band and a high frequency band between 790 MHz and 960 MHz, and the high frequency band is between 1710 MHz and 2690 MHz.

In some embodiments, the length of the feed extension is equal to 0.25 times the center frequency of the low frequency band.

In some embodiments, the adjustment radiating portion includes: a metal portion adjacent to the metal member or coupled to the metal member; a circuit component; a switch, wherein the circuit component is coupled to the metal And a plurality of impedance elements having different impedance values, wherein the switch is for selecting one of the impedance elements such that the metal portion and the circuit component pass the selected impedance The component is coupled to the metal machine component.

In some embodiments, a vertical projection of the circuit component on the metal component is within the closed slot.

In some embodiments, the circuit component is a resistor, a capacitor, or an inductor.

In some embodiments, the vertical projection of the switch and the impedance elements on the metal member is outside the closed slot.

In some embodiments, any of the impedance elements is a resistor, a capacitor, or an inductor.

100, 200, 400‧‧‧ communication devices

110‧‧‧Metal machine components

120‧‧‧Closed slot

121‧‧‧The first closed end of the closed slot

122‧‧‧The second closed end of the closed slot

130, 230‧‧‧Feed into the Department of Radiation

131, 231‧‧ ‧ fed into the first end of the radiation department

132, 232‧‧‧Feed into the second end of the Radiation Department

140, 440‧‧ ‧ Adjusting the Radiation Department

141‧‧‧Adjust the first end of the Radiation Department

142‧‧‧Adjust the second end of the Radiation Department

170‧‧‧Media substrate

190‧‧‧Signal source

250‧‧‧Feed in the extension

251‧‧‧Feed into the first end of the extension

252‧‧‧Feed into the second end of the extension

441‧‧‧Metal parts

443‧‧‧ circuit components

445‧‧‧Switcher

447, 449‧‧‧ impedance components

D1, D2, D3‧‧‧ spacing

The first surface of the E1‧‧• dielectric substrate

E2‧‧‧ second surface of the dielectric substrate

FBL‧‧‧Low frequency band

FBH‧‧‧High frequency band

FP‧‧‧Feeding point

W1, W2, W3, WS‧‧ Width

X‧‧‧X axis

Y‧‧‧Y axis

Z‧‧‧Z axis

1A is a plan view showing a communication device according to an embodiment of the present invention.

Fig. 1B is a side view showing a communication device according to an embodiment of the present invention.

2 is a plan view showing a communication device according to an embodiment of the present invention.

Figure 3 is a diagram showing the return loss of the antenna structure of the communication device according to an embodiment of the present invention.

Figure 4 is a plan view showing a communication device according to an embodiment of the present invention.

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.

Certain terms are used throughout the description and claims to refer to particular elements. Those skilled in the art should understand that the hardware manufacturer may Different nouns are used to refer to the same component. The scope of the present specification and the patent application do not use the difference in the name as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The words "including" and "including" as used throughout the specification and patent application are open-ended terms and should be interpreted as "including but not limited to". The term "substantially" means that within the acceptable error range, those skilled in the art will be able to solve the technical problems within a certain error range to achieve the basic technical effects. In addition, the term "coupled" is used in this specification to include any direct and indirect electrical connection means. Therefore, if a first device is coupled to a second device, the first device can be directly electrically connected to the second device, or indirectly connected to the second device via other devices or connection means. Two devices.

FIG. 1A is a plan view showing a communication device 100 according to an embodiment of the present invention. FIG. 1B is a side view showing a communication device 100 according to an embodiment of the present invention. Please refer to Figures 1A and 1B together. For example, the communication device 100 can be a smart phone, a tablet computer, or a notebook computer, but is not limited thereto. In the embodiment of the first embodiment, the communication device 100 includes a metal mechanism element 110, a feeding radiation unit 130, and a Tuning Radiation Element 140. And a dielectric substrate (Dielectric Substrate) 170. It should be understood that although not shown in FIGS. 1A and 1B, the communication device 100 may further include other components, such as a processor, a touch control panel, and a speaker ( Speaker), a battery module, and a housing (Housing).

The metal machine component 110 can be a metal back cover of the communication device 100, which can belong to an exterior decorative component and can provide a ground potential (eg, 0V). The term "appearance decorative element" means an element on the communication device 100 that can be directly observed by a user. The metal machine component 110 has a closed slot 120. In detail, the closed slot 120 can generally assume a straight strip shape and can have a first closed end 121 and a second closed end 122 away from each other. However, the invention is not limited to this. In other embodiments, the closed slot 120 can also be changed to an open slot, wherein the open slot can also be substantially straight and can have an open end away from each other (Open End). And a closed end.

Both the feed radiation portion 130 and the adjustment radiation portion 140 are made of a metal material such as copper, silver, aluminum, iron, or an alloy thereof. The dielectric substrate 170 can be a FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible circuit board (FCB). The dielectric substrate 170 may have a first surface E1 and a second surface E2, wherein the feeding radiation portion 130 and the adjusting radiation portion 140 are disposed on the first surface E1 of the dielectric substrate 170, and the dielectric substrate 170 is second. The surface E2 can be attached to or directly attached to the metal machine member 110 (adjacent or in contact with the closed slot 120). It should be noted that the term "adjacent" or "close" in this specification may mean that the corresponding two element spacing is less than a predetermined distance (for example, 1 mm or shorter), and may also include the case where the corresponding two elements are in direct contact with each other. (That is, the aforementioned pitch is shortened to 0).

The feed radiation portion 130 may be substantially in an L shape. The feeding radiation unit 130 has a feeding point FP coupled to one of the communication devices 100 (Signal Source) 190. The signal source 190 can be a radio frequency (RF) module that can be used to generate a transmit signal or process a received signal. In detail, the feeding radiation portion 130 has a first end 131 and a second end 132, wherein the feeding point FP is located at the first end 131 of the feeding radiation portion 130 and is fed to the second portion of the radiation portion 130. End 132 is an Open End 132. The feed radiation portion 130 extends across the closed slot 120 of the metal machine member 110, wherein the second end 132 of the feed radiation portion 130 extends away from the adjustment radiation portion 140. That is, the vertical projection of the feeding radiation portion 130 on the metal member 110 at least partially overlaps the closed slot 120. For example, the vertical projection of the feed radiation portion 130 can span some or all of the width WS of the closed slot 120.

The adjustment radiation portion 140 may be substantially straight. The adjustment radiant portion 140 extends across the closed slot 120 of the metal machine member 110. That is, the vertical projection system of the adjustment radiation portion 140 on the metal machine member 110 at least partially overlaps the closed slot 120. For example, the vertical projection of the adjustment radiant portion 140 can span some or all of the width WS of the closed slot 120. In detail, the adjusting radiation portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the adjusting radiating portion 140 is coupled (or directly connected) to the metal machine member 110, and the radiating portion 140 is adjusted. The second end 142 is adjacent to or coupled to (or directly connected to) the metal machine member 110. Please refer to Figure 1B. The adjustment radiation portion 140 may extend from the first surface E1 of the dielectric substrate 170 to the metal machine member 110 such that the first end 141 and the second end 142 of the adjustment radiation portion 140 may directly contact the metal machine member 110. In other embodiments, only the first end 141 of the adjustment radiating portion 140 directly contacts the metal member 110, and another insulating layer (Isolation Layer) will be the metal member. 110 is spaced apart from the second end 142 of the adjustment radiating portion 140 such that a very narrow coupling gap (Coupling Gap) is formed between the metal member 110 and the second end 142 of the adjustment radiating portion 140, wherein the width of the coupling gap Can be less than 0.01mm.

It must be noted that the feed radiation portion 130, the adjustment radiation portion 140, and the closed slot 120 of the metal machine member 110 collectively form an antenna structure (Antenna Structure). According to actual measurement results, when receiving or transmitting a wireless signal, the antenna structure of the communication device 100 can cover a low frequency band and a high frequency band, wherein the aforementioned low frequency band can be between 790 MHz and 890 MHz, and the foregoing high The frequency band can be between approximately 1830 MHz and 2690 MHz. Therefore, the antenna structure of the communication device 100 can support at least the broadband operation of LTE (Long Term Evolution).

In some embodiments, the principle of operation of the antenna structure of communication device 100 can be as follows. The feed slot 130 and the closed slot 120 of the metal member 110 are collectively excited to generate the aforementioned low frequency band, and the feed radiating portion 130 is separately excited to generate the aforementioned high frequency band. The adjustment radiating portion 140 can be used to fine-tune the Impedance Matching of the antenna structure, thereby reducing the minimum operating frequency of the antenna structure and increasing the operating bandwidth of the antenna structure. In this design, the length of the closed slot 120 of the metal member 110 (i.e., the length from the first closed end 121 to the second closed end 122) may be less than 0.5 times the wavelength of the center frequency of the aforementioned low frequency band (λ) /2), the overall size of the communication device 100 and its antenna structure can be further reduced.

In some embodiments, the component sizes of the communication device 100 can be as described below. The distance D1 between the feed point FP and the first closed end 121 of the closed slot 120 may be between about 40 mm and 45 mm. Adjusting the radiation portion 140 and the closed slot 120 The distance D2 between the second closed ends 122 may be between about 0.5 mm and 38 mm. The length of the closed slot 120 may be approximately 0.25 times the wavelength (λ/4) to 0.5 times the wavelength (λ/2) of the center frequency of the aforementioned low frequency band. The length of the feed radiation portion 130 (i.e., the length from the first end 131 to the second end 132) may be substantially equal to 0.25 times the wavelength (λ/4) of the center frequency of the aforementioned high frequency band. The length of the adjustment radiation portion 140 (i.e., the length from the first end 141 to the second end 142) may be greater than the width WS of the closed slot 120. The above component size range is determined based on a plurality of experimental results, which contributes to optimizing the operating frequency band and Impedance Matching of the antenna structure of the communication device 100.

2 is a plan view showing a communication device 200 according to an embodiment of the present invention. Figure 2 is similar to Figure 1A. In the embodiment of FIG. 2, the communication device 200 further includes a feed radiation portion 230 and a feeding extension element (250), wherein the feed radiation portion 230 and the feed extension portion 250 are made of a metal material. They are fabricated and disposed on the dielectric substrate 170. The feed radiation portion 230, the feed extension portion 250, the adjustment radiation portion 140, and the closed slot 120 of the metal machine member 110 collectively form an antenna structure. The combination of one of the feed radiation portion 230 and the feed extension portion 250 may be substantially an S-shape. In detail, the feeding radiation portion 230 can be substantially J-shaped and has a first end 231 and a second end 232, wherein the first end 231 of the feeding radiation portion 230 is coupled to the feeding point FP, and The second end 232 of the feeding radiation portion 230 is an open end. The feed extension 250 can be substantially in an L shape and has a first end 251 and a second end 252, wherein the first end 251 of the feed extension 250 is coupled to the feed point FP, and the feed extension The second end 252 of the 250 is an open end. It must be noted that the vertical projection of the second end 232 of the feeding radiation portion 230 and the second end 252 of the feeding extension portion 250 on the metal machine member 110 They are all located within the closed slot 120. According to the actual measurement result, if the second end 232 of the feeding radiation portion 230 and the second end 252 of the feeding extension portion 250 are completely surrounded by the closed slot 120, the antenna structure of the communication device 200 can be optimized. Impedance matching, as well as increasing the operating bandwidth of this antenna structure. In some embodiments, the S-shape of the combination of the feed radiation portion 230 and the feed extension portion 250 has an unequal width configuration. For example, the width W1 of the second end 232 of the feeding radiation portion 230 may be greater than the width W2 of the second end 252 of the feeding extension portion 250, and the width W2 of the second end 252 of the feeding extension portion 250 may be greater than the adjusting radiation portion. The width W40 of 140 (i.e., W1 > W2 > W3). Such an unequal width structure can fine tune the resonant length and operating frequency of the antenna structure of the communication device 200. For example, if any of the widths W1, W2, and W3 is increased, the operating frequency of the antenna structure of the communication device 200 is shifted in the low frequency direction, and if any of the widths W1, W2, and W3 is small, Then, the operating frequency of the antenna structure of the communication device 200 will move in the high frequency direction. However, the present invention is not limited to this. In other embodiments, the S-shape of the combination of the feed radiation portion 230 and the feed extension portion 250 may also be changed to an equal-width structure (ie, W1 = W2 = W3).

Figure 3 is a graph showing the Return Loss of the antenna structure of the communication device 200 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). According to the measurement result of FIG. 3, when receiving or transmitting a wireless signal, the antenna structure of the communication device 200 can cover a low frequency band FBL and a high frequency band FBH, wherein the aforementioned low frequency band FBL can be about 790 MHz to 960 MHz. Meanwhile, the aforementioned high frequency band FBH may be between about 1710 MHz and 2690 MHz. Therefore, the antenna structure of the communication device 200 can support at least the wideband operation of LTE.

In the embodiment of FIG. 2, the antenna structure of the communication device 200 The principle of operation and component dimensions can be as follows. The feed slot 230 and the closed slot 120 of the metal member 110 are co-excited to generate a first frequency interval between 790 MHz and 890 MHz in the low frequency band FBL, and the feed radiating portion 230 is separately excited to generate a high frequency band. The FBH has a second frequency interval between 1830 MHz and 2690 MHz. Furthermore, the feeding slot 250 and the closed slot 120 of the metal member 110 are co-excited to generate a third frequency interval between 890 MHz and 960 MHz in the low frequency band FBL, and 1710 MHz in the high frequency band FBH. One of the fourth frequency intervals between 1830 MHz. Therefore, the addition of the feed extension portion 250 contributes to simultaneously increasing the bandwidth of the low frequency band FBL of the antenna structure of the communication device 200 and the bandwidth of the high frequency band FBH (compared with the embodiment of FIGS. 1A and 1B, the low frequency band) The FBL newly adds a third frequency interval, while the high frequency band FBH newly increases the fourth frequency interval). In terms of component size, the distance D3 between the feed point FP and the first closed end 121 of the closed slot 120 may be between about 40 mm and 45 mm. The distance D2 between the adjustment radiation portion 140 and the second closed end 122 of the closed slot 120 may be between about 0.5 mm and 38 mm. The length of the closed slot 120 (ie, the length from the first closed end 121 to the second closed end 122) may be between about 0.25 times the wavelength (λ/4) to 0.5 times the center frequency of the low frequency band FBL. (λ/2). The length of the feed radiation portion 230 (i.e., the length from the first end 231 to the second end 232) may be substantially equal to 0.25 times the wavelength (λ/4) of the center frequency of the high frequency band FBH. The length of the feed extension 250 (i.e., the length from the first end 251 to the second end 252) may be substantially equal to 0.25 times the wavelength (λ/4) of the center frequency of the low frequency band FBL. The remaining features of the communication device 200 of FIG. 2 are similar to those of the communication device 100 of FIGS. 1A and 1B. Therefore, the second embodiment can achieve similar operational effects.

Figure 4 is a diagram showing a communication device according to an embodiment of the present invention. Set the top view of 400. Figure 4 is similar to Figure 2. In the embodiment of FIG. 4, one of the communication device 400 adjusting the radiation portion 440 includes: a metal portion (Metal Portion) 441, a circuit element 443, a switch element 445, and a plurality Impedance elements 447 and 449, wherein the circuit element 443, the switch 445, and the impedance elements 447 and 449 are disposed on the dielectric substrate 170. The metal portion 441 is adjacent to or coupled to (or directly connected to) the metal machine member 110. The circuit component 443 is coupled between the metal portion 441 and the switch 445. For example, circuit component 443 can be a resistor, a capacitor, or an inductor. The vertical projection of circuit component 443 on metal machine member 110 is within closed slot 120. The impedance elements 447, 449 have different impedance values. For example, any of the impedance elements 447, 449 can be a resistor, a capacitor, or an inductor. The switch 445 can select one of the impedance elements 447, 449 according to a control signal such that the metal portion 441 and the circuit component 443 can be coupled to a ground potential via the selected impedance element (ie, the metal member) 110). The aforementioned control signals can be generated by a processor based on a user input. The vertical projections of the switch 445 and the impedance elements 447, 449 on the metal member 110 are all outside of the closed slot 120. By controlling the switch 445 to switch between the impedance elements 447, 449, the adjustment radiating portion 440 can dynamically change the impedance matching of the antenna structure of the communication device 400, thereby further expanding the operating bandwidth of the antenna structure. According to the actual measurement results, the circuit element 443, the switch 445, and the aforementioned positions of the impedance elements 447, 449 (within or outside the closed slot 120) can avoid the radiation field of the antenna structure of the communication device 400. The Radiation Pattern produces severe interference. Although only Figure 4 shows only The two impedance elements 447, 449, but in other embodiments, the adjustment radiation portion 440 can more than three different impedance elements depending on different needs. The remaining features of the communication device 400 of FIG. 4 are similar to those of the communication device 100 of FIGS. 1A and 1B. Therefore, the second embodiment can achieve similar operational effects.

The present invention provides a novel antenna structure that includes a slot and a design that modulates the radiating portion. When the antenna structure is applied to a communication device having a metal component, since the metal component can be regarded as an extension of the antenna structure, the metal component can be effectively prevented from adversely affecting the communication quality of the communication device. Adjusting the addition of the radiating portion can reduce the operating frequency of the antenna structure and expand the operating bandwidth of the antenna structure. It should also be noted that the present invention can further improve the design of the communication device without excavating any antenna window (Antenna Window) on the metal machine component. In summary, the present invention has the advantages of small size, wide frequency band, and beautification of the appearance of the device, so it is well suited for use in a variety of various types of mobile communication devices.

It is to be noted that the above-described component sizes, component shapes, and frequency ranges are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The communication device and antenna structure of the present invention are not limited to the state illustrated in Figures 1-4. The invention may include only any one or more of the features of any one or a plurality of embodiments of Figures 1-4. In other words, not all illustrated features must be implemented simultaneously in the communication device and antenna structure of the present invention.

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.

Claims (20)

A communication device comprising: a metal machine member having a closed slot; a feed radiation portion extending across the closed slot, wherein the feed radiation portion has a feed point; and an adjustment radiation portion extending across the a closed slot, wherein a first end of the adjusting radiating portion is coupled to the metal member, and a second end of the adjusting radiating portion is adjacent to the metal member or coupled to the metal member; a dielectric substrate adjacent to the metal member, wherein the feeding radiation portion and the adjusting radiation portion are disposed on the dielectric substrate; wherein the feeding radiation portion, the adjusting radiation portion, and the closing portion of the metal machine member The slots together form an antenna structure. The communication device according to claim 1, wherein the feeding radiation portion has an L shape. The communication device of claim 1, wherein the adjustment radiation portion has a straight strip shape. The communication device of claim 1, wherein the closed slot has a straight strip shape and has a first closed end and a second closed end. The communication device of claim 4, wherein the distance between the feed point and the first closed end is between 40 mm and 45 mm. The communication device of claim 4, wherein the distance between the adjustment radiation portion and the second closed end is between 0.5 mm and 38 mm. The communication device according to claim 1, wherein the antenna structure covers a low frequency band and a high frequency band, and the low frequency band is between 790 MHz and Between 890 MHz, and the high frequency band is between 1830 MHz and 2690 MHz. The communication device of claim 7, wherein the length of the closed slot is between 0.25 times and 0.5 times the center frequency of the low frequency band. The communication device of claim 7, wherein the length of the feed radiation portion is equal to 0.25 times the wavelength of the center frequency of the high frequency band. The communication device of claim 1, further comprising: a feed extension, wherein the first end of the feed radiation portion and the first end of the feed extension are coupled to the feed An in-point, and the second end of one of the feeding radiation portions and the second end of the feeding extension portion are open ends. The communication device of claim 10, wherein the combination of the feed radiation portion and the feed extension portion has an S-shape. The communication device of claim 11, wherein the S-shaped shape has an unequal width structure. The communication device of claim 10, wherein the second projection of the feeding radiation portion and the vertical projection of the second end of the feeding extension on the metal member are located in the closed slot within. The communication device of claim 10, wherein the antenna structure comprises a low frequency band and a high frequency band, the low frequency band is between 790 MHz and 960 MHz, and the high frequency band is between 1710 MHz and 2690 MHz. between. The communication device of claim 14, wherein the length of the feed extension is equal to 0.25 times the wavelength of the center frequency of the low frequency band. The communication device of claim 1, wherein the adjusting radiation portion comprises: a metal portion adjacent to the metal machine member or coupled to the metal machine member; a circuit component; a switcher, wherein a circuit component coupled between the metal portion and the switch; and a plurality of impedance components having different impedance values, wherein the switch is configured to select one of the impedance components such that the metal portion and The circuit component is coupled to the metal component via the selected impedance component. The communication device of claim 16, wherein the vertical projection of the circuit component on the metal component is located within the closed slot. The communication device of claim 16, wherein the circuit component is a resistor, a capacitor, or an inductor. The communication device of claim 16, wherein the vertical projection of the switch and the impedance elements on the metal member is outside the closed slot. The communication device of claim 16, wherein any one of the impedance elements is a resistor, a capacitor, or an inductor.