CN104425874A - Antenna and electronic device - Google Patents

Abstract

The invention relates to an antenna and an electronic device. The antenna is used for an electronic device and comprises: a grounding plate for providing grounding; the metal sheet is approximately corresponding to a rectangle in shape, and a first truncated corner is formed at a first corner of the rectangle; the feed-in component is electrically connected to a second corner of the metal sheet relative to the rectangle and used for transmitting electromagnetic energy, and the second corner is adjacent to the first corner; the short circuit wall is electrically connected with the grounding plate and a first edge of the metal sheet, so that a resonant cavity is formed between the grounding plate and the metal sheet, the first edge is the opposite edge of a second edge of the metal sheet, and the second edge is adjacent to the first corner and the second corner; the length and the width of the rectangle corresponding to the metal sheet are respectively related to the frequency range of at least one working frequency band of the antenna, and the first cut angle of the metal sheet is used for increasing the frequency range of a first frequency band in the at least one working frequency band. The invention has the advantages of wide band, multiple frequency bands, small size, high efficiency and the like.

Description

Antennas and Electronics

technical field

The invention relates to an antenna and an electronic device, especially an antenna and an electronic device with the characteristics of broadband, multi-band or wide-band, small size, and high efficiency.

Background technique

Antennas are used to transmit or receive radio waves to transmit or exchange radio signals. Generally, electronic products with wireless communication functions, such as notebook computers, personal digital assistants (Personal Digital Assistant), etc., usually access wireless networks through built-in antennas. Therefore, in order to allow users to access the wireless communication network more conveniently, the bandwidth of the ideal antenna should be increased as much as possible within the allowable range, while the size should be reduced as much as possible to match the trend of shrinking the size of portable wireless communication equipment. The antenna is integrated into the portable wireless communication equipment. In addition, with the evolution of wireless communication technology, different wireless communication systems may have different operating frequencies. Therefore, an ideal antenna should be able to cover frequency bands required by different wireless communication networks with a single antenna.

In the known technology, for multi-frequency applications, the common way is to use multiple antennas or multiple radiators (such as slot holes of slot antennas, branches of dipole antennas, etc.) to send and receive wireless signals in different frequency bands respectively, resulting in design The complexity increases and, more seriously, the overall size of the antenna increases as the required frequency bands increase. If the installation space of the antennas is relatively limited, it may even cause interference between the antennas, thereby affecting the normal operation of the antennas. Therefore, how to provide an antenna suitable for multi-frequency applications in a limited area has become one of the goals of the industry.

Therefore, it is necessary to provide an antenna and an electronic device to meet the above requirements.

Contents of the invention

Therefore, the main purpose of the present invention is to provide an antenna and an electronic device, which can achieve multi-frequency or broadband operation in a limited area.

The present invention discloses an antenna, which is used in an electronic device. The antenna includes: a grounding plate, which is used to provide grounding; a metal sheet, the shape of the metal sheet roughly corresponds to a rectangle, and the shape of the metal sheet roughly corresponds to a rectangle. A first corner of a first corner forms a first truncated corner; a feed-in component, the feed-in component is electrically connected to a second corner of the metal sheet relative to the rectangle for transmitting electromagnetic energy, and the second corner is adjacent at the first corner; and a short-circuit wall, the short-circuit wall electrically connects the ground plate and a first side of the metal sheet, so that a resonant cavity is formed between the ground plate and the metal sheet, and the first side is the first side of the metal sheet The opposite side of a second side of the metal sheet, the second side is adjacent to the first corner and the second corner; wherein, a length and a width of the rectangle corresponding to the metal sheet are respectively related to the antenna The frequency range of at least one working frequency band, and the first cut-off angle of the metal plate is used to increase the frequency range of a first frequency band in the at least one working frequency band.

The present invention also discloses an electronic device, which includes: an operating circuit; a metal casing, which covers the operating circuit and forms a window; and an antenna, which is arranged in the metal casing And adjacent to the window, the antenna includes: a grounding plate, the grounding plate is used to provide grounding, the grounding plate is electrically connected to the metal housing; a metal sheet, the shape of the metal sheet roughly corresponds to a rectangle, and in A first corner of the rectangle forms a first truncated corner; a feed-in component, the feed-in component is electrically connected to a second corner of the metal sheet relative to the rectangle, and is used to communicate between the operation circuit and the metal sheet Electromagnetic energy is transmitted between the second corner and the first corner; and a short-circuit wall, the short-circuit wall is electrically connected to the ground plate and a first side of the metal sheet, so that the ground plate and the metal sheet A resonant cavity is formed, the first side is opposite to a second side of the metal sheet, and the second side is adjacent to the first corner and the second corner; wherein, the metal sheet corresponds to the rectangular A length and a width are respectively related to the frequency range of at least one working frequency band of the antenna, and the first cut-off angle of the metal plate is used to increase the frequency range of a first frequency band in the at least one working frequency band.

The antenna of the present invention can have the advantages of wide band, multiple frequency bands, small size, high efficiency and the like.

Description of drawings

FIG. 1A to FIG. 1D are schematic diagrams of an antenna in an isometric view, a side, a front and a back, respectively, according to an embodiment of the present invention.

FIG. 2A is a schematic diagram of a center-fed patch antenna.

FIG. 2B is a schematic diagram of an asymmetrically fed patch antenna.

2C and 2D are schematic diagrams of the electric field direction of the patch antenna in FIG. 2B .

FIG. 2E is a schematic diagram of a patch antenna with a shorting wall.

FIG. 3A is a schematic diagram of the distribution of surface electric field vectors when the antenna of FIG. 1A works in a low frequency band.

FIG. 3B and FIG. 3C are schematic diagrams of distribution of surface electric field vectors when the antenna of FIG. 1A works in a high-frequency band.

4A to 4D are schematic diagrams of antennas according to different embodiments of the present invention.

FIG. 5A and FIG. 5B are isometric and frontal views of an antenna according to an embodiment of the present invention.

FIG. 5C is a schematic diagram of the VSWR of the antenna in FIG. 5A .

6A to 6C are schematic diagrams of VSWR, antenna efficiency and field shape of the antenna in FIG. 5A .

7A to 7C are schematic diagrams of VSWR, antenna efficiency and field shape of the antenna in FIG. 5A .

8A and 8B are front and partial cross-sectional schematic diagrams of an integrated computer system.

FIG. 9 is a schematic diagram of a notebook computer.

10A and 10B are schematic diagrams of two operating modes of a notebook computer with tablet computer functions.

11A to 11E are schematic diagrams of VSWR, antenna efficiency and field patterns obtained by applying the antenna of FIG. 5A to the notebook computer of FIG. 10A and FIG. 10B .

12A to 12C are schematic diagrams of different embodiments of a fixing member in the antenna of FIG. 1A .

Description of main component symbols:

Detailed ways

Please refer to FIG. 1A to FIG. 1D . FIG. 1A to FIG. 1D are schematic views of an antenna 10 according to an embodiment of the present invention at an isometric angle, a side view, a front view, and a rear view, in which coordinate systems of X, Y, and Z axes are marked, to display the viewing angle position. The antenna 10 can be used in portable electronic devices with wireless communication functions to send and receive wireless signals in at least one frequency band, such as notebook computers, personal digital assistants (Personal Digital Assistant), etc., but not limited thereto. The antenna 10 includes a ground plate 102 , a metal sheet 104 , a feeding element 106 , a shorting wall 108 and a fixing piece 110 . The grounding plate 102 is used to provide grounding (that is, to connect to the ground terminal of the portable electronic device), which includes a first block 1020 and a second block 1022, and there is an included angle between them In this example, the angle It can cooperate with the mechanism design of portable electronic devices. The metal sheet 104 can cooperate with the ground plate 102 to transmit or receive wireless signals, and it can be seen from FIG. 1A and FIG. 1C that the shape of the metal sheet 104 can be regarded as truncating a corner of a rectangle whose length is L_rt and width is W_rt. Or it can be regarded as a right triangle whose vertex angle is θ by truncating a rectangle whose length is L_rt and width is W_rt. In addition, as can be seen from FIG. 1B , the metal sheet 104 is substantially located on the first block 1020 of the ground plate 102 , that is, viewed from the front (as shown in FIG. 1C ), the metal sheet 104 and the first block 1020 partially overlap. The feeding component 106 is electrically connected to a corner of the metal sheet 104 for transmitting electromagnetic energy, and the corner is adjacent to the truncated corner; in other words, the antenna 10 feeds signals in an asymmetric manner. The shorting wall 108 is electrically connected to the side of the metal sheet 104 and the grounding plate 102 , so that a resonant cavity is formed between the grounding plate 102 and the metal sheet 104 . The length of the shorting wall 108 is L_sw and the height is H1 . In addition, the fixing member 110 can be made of plastic or other non-conductive materials, which can fix the relative position of the metal sheet 104 and the ground plate 102 so that the other side of the metal sheet 104 opposite to the short-circuit wall 108 is at a height H2 from the ground plate 102 .

It can be seen from the above that the structure of the antenna 10 is similar to a patch antenna (Patch Antenna), but it has asymmetric feeding, short-circuit walls, truncated corners and other parts and is different from the traditional patch antenna. The following will be directed to the antenna 10 in order The principle of operation is explained.

First, as mentioned above, the feed-in component 106 is electrically connected to a corner of the metal sheet 104 to achieve an asymmetric feed-in signal. Traditionally, as shown in FIG. 2A , a patch antenna 20 adopts a central (symmetrical) feed, and its length L_f1 is roughly equal to half of the wavelength of the signal corresponding to frequency f1, so as to transmit and receive signals of frequency f1; in other words, The conventional patch antenna 20 can only achieve single-frequency operation. In contrast, the antenna 10 adopts asymmetric feeding, and the related concept is shown as a patch antenna 22 in FIG. Its width L_f2 is also controlled to be roughly equal to one-half of the signal wavelength corresponding to frequency f2; thereby, the patch antenna 22 can generate resonance points in both the X direction and the Y direction corresponding to frequencies f1 and f2, as shown in Fig. 2C and Fig. 2D (where the arrows indicate the direction of the electric field), so dual-frequency operation can be achieved.

Further, observing FIG. 2D, it can be seen that a resonance zero point is generated on the center line of the patch antenna 22 in the Y direction. Therefore, if the center line in the Y direction is connected to the ground, the resonance operation in the Y direction can still be maintained without affecting the X Orientation original works. Therefore, as shown in FIG. 2E , a patch antenna 24 conducts the patch antenna 22 from the center line in the Y direction to the ground through a short-circuit wall 26 , so that the width of the patch antenna 24 can be reduced to L_f2/2.

It can be known from the above that the antenna 10 can achieve dual-band operation through asymmetric feeding, and the width W_rt of the antenna 10 can be effectively reduced through the short-circuit wall 108 . Therefore, if the application of the 2.4GHz and 5GHz frequency bands of the wireless local area network is taken as an example, the length and width (L_rt, W_rt) of the metal sheet 104 are respectively related to the high frequency (5GHz) resonance position and the low frequency (2.4GHz) resonance position; More precisely, the length L_rt of the antenna 10 is approximately one-half of the corresponding wavelength of the high-frequency signal, and the width W_rt is approximately one-fourth of the corresponding wavelength of the low-frequency signal. However, it should be noted that by controlling the length L_sw of the short-circuit wall 108 , the width W_rt can be further lower than a quarter of the corresponding wavelength of the low-frequency signal. In detail, the length L_sw of the short-circuit wall 108 can affect the shortest distance from the feeding point (ie, the connection point between the feeding component 106 and the metal sheet 104 ) to the ground, and thus is related to the center frequency of the low frequency. Therefore, in the case of limited size, the length L_sw of the short-circuit wall 108 can be shortened, so that the shortest distance from the feeding point to the ground is extended from W_rt to W_dm, that is, the center frequency of the low frequency is determined by the distance W_dm. In this way, the width W_rt can be further reduced to less than a quarter of the corresponding wavelength of the low frequency signal.

On the other hand, since the length L_rt of the metal sheet 104 is related to high-frequency work, taking WLAN as an example, its high-frequency frequency band needs to cover 18% of the bandwidth of 5GHz to 6GHz, which is much larger than the low-frequency frequency band of 2GHz to 3GHz Four percent of the bandwidth in . Therefore, the present invention further utilizes the truncation method to linearly reduce the length of one side of the metal sheet 104 (that is, the side opposite to the side connected to the short-circuit wall 108 ) from L_rt to L_dm, thereby effectively extending the range of the high-frequency operating frequency range. That is to say, the truncated angle of the angle θ enables the metal sheet 104 to provide a length change from L_rt to L_dm, thereby providing various high-frequency paths and generating multiple modes. For example, please refer to FIG. 3A to FIG. 3C. FIG. 3A is a schematic diagram of the distribution of the surface electric field vector of the metal sheet 104 when the antenna 10 works in the low frequency band, and FIG. 3B and FIG. 3C are when the antenna 10 works in the two high frequency bands. A schematic diagram of the distribution of the surface electric field vector of the metal sheet 104 . Among them, the arrow indicates the direction of the electric field, and its length represents the relative strength. It can be seen from FIG. 3B and FIG. 3C that due to the change of the length of the metal sheet 104, the metal sheet 104 can generate different modes in the high-frequency band, thereby expanding the range of the high-frequency band to achieve broadband operation. It should be noted that Fig. 3A to Fig. 3C show the electric field vector distribution in the resonant cavity, in fact, there is still an electric field overflowing from the edge of the metal sheet; however, in any case, the radiation direction of the antenna 10 is mainly towards the direction other than the ground plate 102 , without radiating toward the ground plane 102.

In addition, in the antenna 10, the feed-in component 106 is made of a microstrip line, and it is preferably a quarter-wavelength impedance converter. 1/4 of the wavelength of the signal, but the actual length depends on the impedance point of the metal sheet 104, so the line length ranges from 1/8 to 3/8 of the wavelength of the wireless signal corresponding to the low frequency band. In detail, the metal edge feed-in method will cause a relatively large impedance value, so the present invention uses the Smith Chart tool to adjust the length L_fd to match the impedance point to about 50 ohms, thereby improving the transmission efficiency, and then Improve radiation efficiency.

Summarizing the above, it can be seen that the antenna 10 of the embodiment of the present invention uses asymmetric feed-in to stimulate dual-frequency operation; uses the short-circuit wall 108 to reduce the required width; uses a truncated angle structure to generate multiple modes at high frequencies to Increase the range of high-frequency bands; and use a quarter-wavelength impedance converter to match the impedance point to 50 ohms to improve transmission efficiency.

It should be noted that the antenna 10 is an embodiment of the present invention, and those skilled in the art can make various modifications accordingly, and is not limited thereto. For example, as shown in FIG. 1B , the height H2 is greater than the height H1 (of the short-circuit wall 108 ), but it is not limited thereto, and the two can also be equal; generally speaking, the larger the heights H1 and H2 are, the better the relative radiation efficiency is. However, it still needs to be kept within a certain range, for example, the lower limit of the height should not be less than 2mm, so as to ensure that the electric field scattered between the ground plate 102 and the metal sheet 104 can radiate into the free space.

In addition, as mentioned above, the length L_sw of the shorting wall 108 is related to the center frequency of the low frequency, and by shortening the length L_sw of the shorting wall 108 , the width W_rt is less than a quarter of the corresponding wavelength of the low frequency signal. For example, if iron is used to realize the antenna 10, and under the condition that the medium is air, the quarter wavelength of 2.4 GHz is 31.25 mm, and the short-circuit wall 108 is shortened to increase the low-frequency resonance path, then the width W_rt can be made less than 10mm, which is 68% smaller than 31.25mm. However, it should be noted that, in order to avoid excessive damage to the low-frequency and high-frequency electric field distribution characteristics of the metal sheet 104 , the length L_sw can be set to be larger than one-eighth of the wireless signal wavelength corresponding to the high-frequency band.

In addition, except that the length of the feeding component 106 needs to match the impedance point to about 50 ohms, its width or shape is not limited. For example, in the antenna 10, the width of the feeding component 106 is uniform and includes three bends, but it can also be tapered, or it can include more, less, or even no bends. bent. Wherein, it should be noted that, in order to avoid interfering with the fringing field of the metal sheet 104, the distance L_gp between the feeding component 106 and the metal sheet 104 should meet the following conditions:

L_gp>0.24λr+0.375*(H1+H2);

Wherein, λr is the wireless signal wavelength corresponding to the low frequency band.

On the other hand, in the antenna 10, the ground plate 102 is divided into a first block 1020 and a second block 1022, which is to distinguish the part covered by the metal sheet 104 (or resonant cavity) in the ground plate 102 (ie, the second block 1020). a block 1020) and the uncovered part (that is, the second block 1022); in fact, the first block 1020 and the second block 1022 can be different parts of the same metal sheet, or can be different metal sheets and passed Connected by electrical connection. However, it should be noted that since the second block 1022 is the direction of the slot opening of the low-frequency path, the second block 1022 needs to be connected to the ground using conductive materials (such as conductive glue, conductive foam, welding materials, and copper foil accessories). end, in order to maintain the diffuse electric field effect; as for the first block 1020, it is located directly below the resonant cavity, due to the skin depth effect, the electromagnetic characteristics are only in the cavity, so the first block 1020 can use a general insulating adhesive. Yes, without a direct connection to ground. In addition, if the applied electronic device has a metal back cover or a metal frame, it is necessary to place a conductive material, such as conductive foam (Gasket), to conduct electricity to the second block 1022 to the metal back cover or metal frame, so as to Strengthen the ground effect. In this case, the effect of the metal back cover or the metal frame on the antenna characteristics can be avoided, thereby maintaining good bandwidth, efficiency and field pattern. At the same time, as mentioned above, the radiation direction of the antenna 10 is mainly towards the direction other than the ground plane 102 , therefore, the radiation performance will not be affected in the working environment of a metal back cover or a metal frame.

In addition, the relative position between the first block 1020 and the metal sheet 104 is maintained by the fixing member 110. In other embodiments, if the fixing member 110 is not required, the first block 1020 and the metal sheet 104 can be fixed, such as through the short circuit wall 108 , the fixing member 110 can also be omitted. Moreover, as shown in FIG. 1B , the side of the fixing member 110 is trapezoidal, which is designed for a matching mechanism. In other embodiments, as shown in FIG. 12A to FIG. 12C , the sides of the fixing member 110 may also be rectangular or have curved surfaces, cut corners, etc., depending on different applications. Alternatively, the fixing member 110 may also be implemented by one or more columns or blocks, but is not limited thereto. In terms of material selection, it is only necessary to ensure that the fixing member 110 is made of insulating material, so it is not limited to hard or soft.

In the antenna 10 , the truncation of the angle θ can cause the length of the metal piece 104 to vary from L_rt to L_dm, thereby extending the range of the high-frequency working frequency band. Wherein, in order to avoid excessive influence on the low-frequency path, the angle θ may be limited between 0 degrees and 30 degrees, but is not limited thereto. In this case, those skilled in the art should be able to moderately adjust the angle θ or change the shape of the truncated angle according to the requirements of the system, without being limited to the examples shown in FIG. 1A and FIG. 1C . For example, please refer to FIG. 4A to FIG. 4D . FIG. 4A to FIG. 4D are schematic diagrams of antennas 40 , 42 , 44 , 46 according to an embodiment of the present invention. The structures of the antennas 40, 42, 44, 46 are similar to those of the antenna 10, so symbols of the same components are omitted. The difference between the antenna 40 and the antenna 10 is that the truncated area of a metal sheet 404a of the antenna 40 is trapezoidal. The difference between the antenna 42 and the antenna 10 is that the truncated area of a metal sheet 404b of the antenna 42 is stepped. The difference between the antenna 44 and the antenna 10 is that the truncated corner of a metal piece 404c of the antenna 44 is arc-shaped, and the difference between the antenna 46 and the antenna 10 is that the truncated corner of a metal piece 404d of the antenna 46 is in a sinusoidal shape. The structures of the antennas 40 , 42 , 44 , and 46 are the same as those of the antenna 10 except that the truncated corners of the metal sheets are different. Therefore, the antennas 40 , 42 , 44 , and 46 can also achieve the advantages of broadband, multi-band, small size, and high efficiency.

It should be noted that Fig. 4A to Fig. 4D illustrate that the angle θ, shape, position, etc. of the truncated corner of the metal sheet 104 can be adaptively changed, so that the metal sheet 104 can produce the length change required by the system, and then excite appropriate high-frequency modes . In addition, in another embodiment, the present invention can also add another truncation angle to the opposite corner of the truncation angle of the metal sheet 104, so as to add different length adjustment mechanisms, so as to achieve the purpose of matching or frequency band fine-tuning, and The newly added truncated angle can also be a right-angled triangle or be appropriately changed according to FIG. 4A to FIG. 4D . For example, please refer to FIG. 5A and FIG. 5B. FIG. 5A and FIG. 5B are isometric and frontal schematic diagrams of an antenna 50 according to an embodiment of the present invention, and coordinate systems of X, Y, and Z are marked therein to show camera position. The structure of the antenna 50 is similar to that of the antenna 10 in FIGS. 1A to 1D , so the same components are represented by the same symbols. The difference between the antenna 50 and the antenna 10 is that a metal sheet 504 of the antenna 50 has another truncation angle compared with the metal sheet 104 of the antenna 10 , and the truncation angle is stepped and has a step height of W1 to W4 . The order heights W1-W4 can effectively adjust the impedance matching of high and low frequencies.

It should be noted that the truncated angle of the metal sheet 504 compared with the metal sheet 104 is used to provide a different adjustment mechanism, so that the high-frequency operating frequency band can be continuous, so the shape and position of the truncated angle can be adaptively changed , for example, may be appropriately changed with reference to FIG. 1A or FIG. 4A to FIG. 4D . For example, in one embodiment, for the application of the 2.4GHz and 5GHz frequency bands of the wireless local area network, the order heights W2˜W4 may have the following relationship:

W2:W3:W4=1:2:2.

Thereby, the antenna 50 can achieve a schematic diagram of a voltage standing wave ratio (Voltage Standing Waveform Ratio, VSWR) as shown in FIG. 5C . It can be seen from FIG. 5C that the low-frequency operating frequency band FB_L of the antenna 50 can meet the requirements of the wireless local area network at 2.4GHz, while the high-frequency operating frequency band FB_H includes multiple continuous operating frequency bands through the truncation mechanism, thus roughly covering 5 GHz to 6 GHz. range, which can fully meet the requirements of wireless local area network 5GHz.

In addition, since the antennas (10, 40-46, 50) of the embodiments of the present invention adopt multiple mechanisms for increasing resonance paths or enhancing bandwidth, such as short-circuit walls, truncated corners, and quarter-wavelength feeding, etc., it can effectively Reduce the required area. Taking the application of the 2.4GHz and 5GHz frequency bands of the wireless local area network as an example, the required length of the antenna can be between 60mm and 35mm, the width can be between 10mm and 13mm, and the height is not less than 2mm, and within this range The antenna efficiency, bandwidth, etc. can meet the needs of wireless local area networks. For example, please refer to FIG. 6A to FIG. 6C and FIG. 7A to FIG. 7C; FIG. 6A to FIG. 6C show the voltage standing wave ratio of the antenna 50 when the length, width, and height of the antenna 50 are set to 60mm, 13mm, and 3mm respectively. , Antenna efficiency and a schematic diagram of the field pattern; and FIGS. 7A to 7C are schematic diagrams of the voltage standing wave ratio, antenna efficiency and field pattern of the antenna 50 when the length, width, and height of the antenna 50 are set to 35mm, 10mm, and 3mm respectively. Wherein, in FIG. 6C and FIG. 7C , the solid line, dotted line, and dotted line represent the field patterns of 2400 MHz, 2450 MHz, and 2500 MHz, respectively. It can be seen from FIG. 6A to FIG. 7C that even if the size of the antenna 50 is reduced, the antenna 50 can still maintain good bandwidth, efficiency and field pattern.

From the above, it can be seen that the antenna (10, 40-46, 50) of the present invention can achieve dual-band operation, can properly reduce the required size, can increase the range of high-frequency bands, and has good transmission efficiency. In this case, the antenna of the present invention is also suitable for harsh environments, such as applications with small installation areas or metal housings. More precisely, for an electronic device using a metal back cover or a metal frame, since the radiation direction of the antenna of the present invention is mainly directed toward a direction other than the ground plane, at the same time, the ground plane of the antenna of the present invention is truly connected to the metal back cover or metal frame. The frame is electrically connected to prevent the metal back cover or metal frame from affecting the antenna characteristics, thereby maintaining good bandwidth, efficiency, and field pattern. It should be noted that the application of the so-called metal shell means that the operating circuit of the electronic device is roughly covered or partially covered by the metal shell. The area completely covered by the metal shell, or if the metal shell forms a window for installing components such as a screen or a keyboard, the antenna of the present invention can be placed adjacent to the window.

For example, please refer to FIG. 8A and FIG. 8B . FIG. 8A and FIG. 8B are front and partial cross-sectional schematic diagrams of an integrated computer system 80 . The integrated computer system 80 is integrated with a computer host and a (touch) screen, and may have a metal back cover or housing, that is, the metal housing is covered with the operating circuit of the computer host; in this case, the antenna of the present invention can Set in an area 800 around the screen of the integrated computer system 80 (or around the window of the metal casing), and connect the ground plane of the antenna to the metal back cover, so that good bandwidth, efficiency and field can be maintained. type.

Please refer to FIG. 9 , which is a schematic diagram of a notebook computer 90 . The notebook computer 90 mainly includes two parts, a top cover and a base, both of which are connected by a rotating shaft and can be opened and closed reciprocally; wherein, the top cover mainly includes the screen and the operating circuit of the screen, and the base mainly includes the computer host, keyboard and related operating circuits. In this case, if the notebook computer 90 has a metal back cover or casing, the antenna of the present invention can be arranged in an area 900 around the screen of the notebook computer 90 or an area 902 around the keyboard, and the antenna's The ground plane is connected to the metal back cover or case, which can maintain good bandwidth, efficiency and field shape.

Furthermore, FIG. 10A and FIG. 10B are schematic diagrams of two operation modes of a notebook computer 11 with tablet computer functions. The notebook computer 11 is also called a yoga machine. The rotating shaft between the upper cover of the screen and the keyboard base can be opened and closed in addition to being reciprocated, and can also be rotated and folded at 360 degrees, so it can be operated in the traditional notebook computer mode of opening the cover (that is, FIG. 10A ), or operate in tablet mode with the lid closed (ie, Figure 10B). In this case, even if the notebook computer 11 uses a metal back cover to cover the operation circuit, the antenna of the present invention can be disposed in an area 1100 of the edge of the screen of the notebook computer 11 . In this case, if the antenna 50 is placed in the area 1100 , the antenna 50 may have VSWR, antenna efficiency and field diagrams as shown in FIGS. 11A to 11E for the two operation modes. In FIG. 11A to FIG. 11E , the solid line curve and the dotted line curve represent the antenna characteristics of the notebook computer 11 operating in the open mode (as shown in FIG. 10A ) and the closed mode (as shown in FIG. 10B ), respectively, while FIG. 11C to FIG. 11E are Respectively represent the field patterns of 2400MHz, 2450MHz and 2500MHz. Therefore, as can be seen from FIG. 11A to FIG. 11E , for the application of the yoga machine, the antenna 50 is not only suitable for the application of the metal back cover, but also meets the requirements of the tablet operation in the closed cover mode.

It should be noted that the foregoing embodiments are used to illustrate the concept of the present invention, and those skilled in the art should make various modifications accordingly, without being limited thereto. For example, in addition to the aforementioned frequency adjustment or antenna characteristic optimization mechanism (such as the size of the metal sheet, the length or height of the short-circuit wall, the shape or structure of the truncated corner, the length or width of the feed-in component, etc.), other such as the choice of substrate material, The selection of the antenna material and the installation position of the antenna can be properly adjusted according to the needs of the system. Furthermore, the dual-frequency work described in the foregoing embodiments is exemplified by the work of 2.4GHz and 5GHz. In fact, the present invention can also be used for a single frequency band, or if the high-frequency frequency band is considered to be composed of multiple sub-frequency bands, then the present invention The invention can also work in more than two frequency bands, and is not limited to dual-frequency work.

To sum up, the antenna of the embodiment of the present invention uses asymmetric feed-in to stimulate dual-frequency operation; uses a short-circuit wall to reduce the required width; uses a truncated angle structure to generate multiple modes at high frequencies to increase The range of high-frequency bands; and the use of a quarter-wavelength converter to match the impedance point to 50 ohms to improve transmission efficiency. Therefore, the antenna of the embodiment of the present invention can have the advantages of broadband, multi-band, small size, high efficiency, and the like.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the present invention.

Claims (40)

1. An antenna, the antenna is used for an electronic device, the antenna comprises: a grounding plate for providing grounding; a metal sheet, the shape of the metal sheet roughly corresponds to a rectangle, and a first truncated corner is formed at a first corner of the rectangle; a feed-in component, the feed-in component is electrically connected to a second corner of the metal sheet relative to the rectangle for transmitting electromagnetic energy, the second corner is adjacent to the first corner; and A short-circuit wall, the short-circuit wall electrically connects the ground plate and a first side of the metal sheet, so that a resonant cavity is formed between the ground plate and the metal sheet, and the first side is a second side of the metal sheet the side opposite to , the second side is adjacent to the first corner and the second corner; Wherein, a length and a width of the rectangle corresponding to the metal sheet are respectively related to the frequency range of at least one working frequency band of the antenna, and the first cut-off angle of the metal sheet is used to increase a frequency range in the at least one working frequency band. The frequency range of the first band. 2. The antenna as claimed in claim 1, wherein the ground plane comprises a first block and a second block connected together. 3. The antenna of claim 2, wherein the first block and the second block comprise an angle. 4. The antenna as claimed in claim 2, wherein the metal sheet and the first section form the resonant cavity. 5. The antenna as claimed in claim 2, wherein the second block is electrically connected to a ground terminal. 6. The antenna as claimed in claim 5, wherein the ground terminal is also electrically connected to a metal back cover of the electronic device. 7. The antenna of claim 1, wherein the first truncated angle substantially corresponds to a right triangle. 8. The antenna as claimed in claim 4, wherein a hypotenuse of the right triangle comprises a stepped structure, or is arc-shaped. 9. The antenna as claimed in claim 1, wherein the first truncated angle substantially corresponds to a trapezoid. 10. The antenna according to claim 1, wherein the metal sheet also forms a second truncated corner at a third corner of the rectangle, the third corner is opposite to the first corner, and the shape of the second truncated corner is related to in the frequency range of the at least one frequency band. 11. The antenna of claim 10, wherein the second truncated angle substantially corresponds to a right triangle. 12. The antenna as claimed in claim 11, wherein a hypotenuse of the right triangle comprises a stepped structure, or is arc-shaped. 13. The antenna of claim 10, wherein the second truncated angle approximately corresponds to a trapezoid. 14. The antenna as claimed in claim 1, wherein the feed-in component is a microstrip line, and the length of the feed-in component is related to a wireless signal wavelength range corresponding to a lowest frequency band in the at least one frequency band. 15. The antenna of claim 1, wherein the feeding element comprises at least one bend. 16. The antenna as claimed in claim 1, wherein a distance between the second side of the metal sheet and the ground plate is greater than or equal to a height of the short-circuit wall. 17. The antenna as claimed in claim 1, further comprising a fixing part formed in the resonant cavity for fixing the relative position of the metal piece and the ground plate. 18. The antenna according to claim 1, the antenna is disposed on a frame of a screen of the electronic device. 19. The antenna according to claim 1, wherein the electronic device is a notebook computer, and the antenna is disposed around a keyboard of the notebook computer. 20. The antenna as claimed in claim 1, wherein a cross section of the fixing member is trapezoidal or rectangular, or has a curved surface or a cut corner. 21. An electronic device comprising: - operating circuit; a metal casing enclosing the operating circuit and forming a window; and An antenna, the antenna is located in the metal shell and adjacent to the window, the antenna includes: a grounding plate, the grounding plate is used to provide grounding, and the grounding plate is electrically connected to the metal shell; a metal sheet, the shape of the metal sheet roughly corresponds to a rectangle, and a first truncated corner is formed at a first corner of the rectangle; a feed-in component, the feed-in component is electrically connected to a second corner of the metal sheet relative to the rectangle, and is used to transfer electromagnetic energy between the operating circuit and the metal sheet, the second corner is adjacent to the first corner corner; and A short-circuit wall, the short-circuit wall electrically connects the ground plate and a first side of the metal sheet, so that a resonant cavity is formed between the ground plate and the metal sheet, and the first side is a second side of the metal sheet the side opposite to , the second side is adjacent to the first corner and the second corner; Wherein, a length and a width of the rectangle corresponding to the metal sheet are respectively related to the frequency range of at least one working frequency band of the antenna, and the first cut-off angle of the metal sheet is used to increase a frequency range in the at least one working frequency band. The frequency range of the first band. 22. The electronic device as claimed in claim 21, wherein the ground plane comprises a first block and a second block connected together. 23. The electronic device as claimed in claim 22, wherein the first block and the second block comprise an included angle. 24. The electronic device as claimed in claim 22, wherein the metal sheet and the first block form the resonant cavity. 25. The electronic device as claimed in claim 22, wherein the second block is electrically connected to a ground terminal. 26. The electronic device as claimed in claim 25, wherein the ground terminal is also electrically connected to the metal casing. 27. The electronic device as claimed in claim 21, wherein the first truncated angle roughly corresponds to a right triangle. 28. The electronic device as claimed in claim 24, wherein a hypotenuse of the right triangle comprises a stepped structure, or is arc-shaped. 29. The electronic device as claimed in claim 21, wherein the first truncated angle approximately corresponds to a trapezoid. 30. The electronic device as claimed in claim 21, wherein the metal sheet also forms a second truncated corner at a third corner of the rectangle, the third corner is opposite to the first corner, and the shape of the second truncated corner is A frequency range related to the at least one frequency band. 31. The electronic device as claimed in claim 30, wherein the second truncated angle roughly corresponds to a right triangle. 32. The electronic device as claimed in claim 31, wherein a hypotenuse of the right triangle comprises a stepped structure, or is arc-shaped. 33. The electronic device as claimed in claim 30, wherein the second truncated angle approximately corresponds to a trapezoid. 34. The electronic device as claimed in claim 21, wherein the feed-in component is a microstrip line, and the length of the feed-in component is related to a wireless signal wavelength range corresponding to a lowest frequency band in the at least one frequency band. 35. The electronic device as claimed in claim 21, wherein the feeding component comprises at least one bend. 36. The electronic device as claimed in claim 21, wherein a distance between the second side of the metal sheet and the ground plate is greater than or equal to a height of the short-circuit wall. 37. The electronic device as claimed in claim 21, further comprising a fixing member formed in the resonant cavity for fixing the relative position of the metal plate and the ground plate. 38. The electronic device as claimed in claim 21, wherein the window is used to set a screen, and the antenna is set on a border of the screen. 39. The electronic device as claimed in claim 21, which is a notebook computer, wherein the window is used to arrange a keyboard, and the antenna is arranged around the keyboard. 40. The electronic device as claimed in claim 21, wherein a cross section of the fixing member is trapezoidal or rectangular, or has arc or cut corners.