TWI464963B - Multi-band antenna and electronic apparatus having the same - Google Patents

Description

Multi-frequency antenna and electronic device therewith

The present invention relates to an antenna and an electronic device using the same, and more particularly to a multi-frequency antenna having a matching conductor and an electronic device using the same.

In general, the conventional antenna device mostly uses the system ground plane as the antenna ground plane to obtain better impedance matching and bandwidth operation. In general, electronics manufacturers must design antennas for electronic products based on different product specifications and system ground planes for electronic products, so that the antennas have better radiation performance. Accordingly, when electronic product manufacturers develop different electronic products, they often have to redesign the structure of the antenna, which in turn leads to an increase in the design cost of the antenna.

The embodiment of the invention provides a multi-frequency antenna, which comprises an antenna substrate, an antenna ground plane, an antenna unit and a first matching conductor, wherein the antenna ground plane, the antenna unit and the first matching conductor are disposed on the antenna substrate. The antenna ground plane has more than one bend and signal ground. The antenna unit is adjacent to the antenna ground plane and is configured to provide a first operating band and a second operating band. One end of the first matching conductor is electrically connected to the ground plane of the antenna and has an angle with the grounding mask of the antenna. The length of the first matching conductor is close to a quarter of the wavelength corresponding to the frequency of the first operating band. The antenna unit includes a coupling conductor, a feed conductor, a radiation conductor, and a short-circuit conductor. The feed conductor is disposed between the antenna ground plane and the coupling conductor and extends along the coupling conductor. There is a first spacing between the feed conductor and the coupling conductor, and the feed conductor has a signal feed end with respect to the signal ground. One end of the radiating conductor is electrically connected to the coupling conductor, and the other end of the radiating conductor faces the antenna ground plane. There is a second spacing between the radiating conductor and the ground plane of the antenna. One end of the short-circuiting conductor is electrically connected to the coupling conductor, and the other end of the short-circuiting conductor is electrically connected to the grounding surface of the antenna.

In one embodiment of the invention, the width of the ground plane of the antenna is less than or equal to one tenth of the length of the ground plane of the antenna.

In one embodiment of the invention, the multi-frequency antenna further includes a second matching conductor. One end of the second matching conductor is electrically connected to the antenna ground plane, and the length of the second matching conductor is close to a quarter of the wavelength corresponding to the frequency of the second operating band, wherein the second matching conductor has a second angle with the antenna ground plane .

Embodiments of the present invention provide an electronic device including an electronic device body and the multi-frequency antenna described above. The electronic device body includes a system ground plane, a cable line and one or more electronic wafers, and the electronic chip is disposed on the system ground plane. The multi-frequency antenna is electrically connected to the electronic device body through a cable, wherein the signal feeding end of the feeding conductor is electrically connected to the signal line of the cable, and the signal ground end of the antenna grounding surface is electrically connected to the grounding line of the cable, thereby The antenna unit can be electrically connected to the electronic device body via a cable.

In summary, the embodiment of the present invention provides a multi-frequency antenna, and the multi-frequency antenna can be applied to an electronic device. The multi-frequency antenna does not need to be integrated with the system ground plane, and can also have good radiation performance and generate multi-band. The effect of the operation. In other words, the multi-frequency antenna is an independent antenna, and the product manufacturer does not need to redesign the antenna for different electronic products, so the manufacturing cost can be reduced. In addition, by adjusting the angle between the matching conductor and the ground plane of the antenna, the antenna radiation pattern can be further controlled to meet the needs of practical product applications.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

[Embodiment of Multi-Frequency Antenna]

Please refer to FIG. 1. FIG. 1 is a plan view of a multi-frequency antenna according to an embodiment of the present invention. The multi-frequency antenna 10 includes an antenna substrate 100, an antenna ground plane 102, an antenna unit 104, and a matching conductor 106. The antenna ground plane 102 may be a ground plane independent of the body of the electronic device. Therefore, the multi-frequency antenna 10 may be a stand-alone antenna, which is designed to reduce the relationship between the multi-frequency antenna 10 and the system ground plane of the electronic device body. Matching and integration issues.

The antenna substrate 100 may be an elongated rectangular substrate such as an FR4 multilayer substrate. The antenna substrate 100 has a surface (the surface shown in the antenna substrate 100 is shown in FIG. 1 ). The antenna ground plane 102 and the antenna unit 104 are both disposed on the surface of the antenna substrate 100 . For example, the antenna ground plane 102 and the antenna unit 104 are printed on the surface of the antenna substrate 100 by a planar printing technique. However, it should be noted that the manner in which the antenna ground plane 102 and the antenna unit 104 are disposed on the surface is not limited thereto. The shape and material of the antenna substrate 100 are also not intended to limit the present invention.

The antenna ground plane 102 has a signal ground end and more than one bend. For example, the antenna ground plane 102 of FIG. 1 is a strip-shaped metal strip segment having two bends. The width of the antenna ground plane 102 is less than or equal to one tenth of the length of the antenna ground plane 102, thereby reducing the size of the multi-frequency antenna 10, thereby enabling the multi-frequency antenna 10 to be placed in a thin, light electronic device.

The antenna unit 104 is disposed adjacent to the antenna ground plane 102, wherein one end (end point E) of the antenna unit 104 has a spacing S2 with the antenna ground plane 102, and the other end (end point B) of the antenna unit 104 is electrically Connected to the antenna ground plane 102. The antenna unit 104 is configured to provide a first operating frequency band and a second operating frequency band, for example, the first operating frequency band includes a Global System for Mobile communication 850 megahertz/900 megahertz band (GSM 850/900 band, 824 megahertz to 960 megahertz), the second operating band includes the Global System for Mobile Communications 1800 megahertz/1900 megahertz band (GSM 1800/1900 band, 1710 megahertz to 1990 megahertz) and generic operations Communication System (Universal Mobile Telecommunications System) band (UMTS band, 1920 megahertz to 2170 megahertz). It is worth mentioning that the above range of the first operating band and the second operating band are not intended to limit the invention.

One end of the matching conductor 106 is electrically connected to the antenna ground plane 102, and the length of the matching conductor 106 may be at or near a quarter of the wavelength corresponding to any frequency of the first operating frequency band (for example, the center frequency). The matching conductor 106 can be regarded as an extension of the antenna ground plane 102. The antenna designer can adjust the length of the matching conductor 106 to obtain good impedance bandwidth and radiation characteristics of the multi-frequency antenna 10, so the length of the matching conductor 106 is related to the first operation. The wavelength corresponding to any frequency of the frequency band (for example, the center frequency). In the embodiment of the present invention, the matching conductor 106 may be, for example, a matching metal wire, but the embodiment of the matching conductor 106 is not intended to limit the invention.

In addition, the matching conductor 106 has an angle α with the antenna ground plane 102, and the angle α can be adjusted according to the desired radiation pattern, so that the angle α ranges from 0 to 180 degrees. In other words, the radiation pattern of the multi-frequency antenna 10 can be changed by adjusting the angle α. For example, the angle α can be 90 degrees.

It is worth mentioning that the position of the matching conductor 106 at the antenna ground plane 102 is not intended to limit the invention. In other words, one end of the matching conductor 106 can be arbitrarily disposed at any position of the antenna ground plane 102. In addition, although the multi-frequency antenna 10 has only one matching conductor 106, in other embodiments, the number of matching conductors of the multi-frequency antenna 10 may be one or more.

The antenna unit 104 includes a feed conductor 1041, a coupling conductor 1042, a radiation conductor 1043, and a short-circuit conductor 1044. In the embodiment of FIG. 1, the coupling conductor 1042, the radiation conductor 1043 and the short-circuit conductor 1044 form a T-shaped monopole antenna. However, it should be noted that the shape and implementation of the antenna unit 104 are not intended to limit the present invention.

The feed conductor 1041 may be, for example, a feed metal line formed by a metal line segment of the end point A to the end point G, and the coupling conductor 1042 may be, for example, a coupling metal line formed by a metal line segment of the end point C to the end point F. The feed conductor 1041 is disposed between the antenna ground plane 102 and the coupling conductor 1042 and extends along the coupling conductor 1042. The feed conductor 1041 has a signal feed end with respect to the signal ground of the antenna ground plane 102, and has a spacing S1 between the feed conductor 1041 and the coupling conductor 1042.

In the embodiment of the present invention, the signal ground end of the antenna ground plane 102 can be disposed, for example, at the end point B, and the signal feed end of the feed conductor 1041 can be disposed at the end point A, for example. The signal received at the signal feed end of the feed conductor 1041 can transfer electromagnetic energy to the coupling conductor 1042 in a coupling feed.

The radiation conductor 1043 may be, for example, a radiant metal line formed by a metal line segment from the end point D to the end point E. One end of the radiation conductor 1043 (end point D) is electrically connected to the coupling conductor 1042, and the other end of the radiation conductor 1043 (end point E) faces the antenna ground plane 102, and the radiation conductor 1043 faces one end of the antenna ground plane 102 (end point E) has a spacing S2 from the antenna ground plane 102.

The short-circuit conductor 1044 may be, for example, a short-circuited metal line formed by a metal line segment from the end point B to the end point C. One end (end point C) of the short-circuit conductor 1044 is electrically connected to the coupling conductor 1042, and the other end (end point B) of the short-circuiting conductor 1044 is electrically connected to the antenna ground plane 102.

In the embodiment of the present invention, the spacing S1 may be, for example, 0.5 cm, the thickness of the antenna substrate 100 may be, for example, 1 cm, and the length and width of the antenna ground plane 102 are, for example, 55 cm and 2 cm, respectively, and the length of the matching conductor 106 is, for example. It is about 80 cm. However, it should be noted that the above various element sizes are not intended to limit the present invention.

2 and FIG. 3, FIG. 2 is a radiation pattern diagram of a multi-frequency antenna operating in the 925 megahertz band according to an embodiment of the present invention, and FIG. 3 is a multi-frequency antenna operation according to an embodiment of the present invention. Radiation pattern at 1920 MHz. The left side of Fig. 2 shows the radiation pattern of the multi-frequency antenna 10 corresponding to the angle α of 90 degrees, and the right side of Fig. 2 shows the radiation pattern of the multi-frequency antenna 10 corresponding to the angle α of 180 degrees. The left side of Fig. 3 shows the radiation pattern of the multi-frequency antenna 10 corresponding to the angle α of 90 degrees, and the right side of Fig. 3 shows the radiation pattern of the multi-frequency antenna 10 corresponding to the angle α of 180 degrees. As can be seen from FIG. 2 and FIG. 3, the radiation pattern of the multi-frequency antenna 10 is related to the angle α between the matching conductor 106 and the antenna ground plane 102.

Next, please refer to FIG. 4. FIG. 4 is a graph of the frequency and return loss of the multi-frequency antenna according to the embodiment of the present invention. In the graph of FIG. 4, the multi-frequency antenna 10 has a voltage standing wave ratio (VSWR) of 3:1. When the multi-frequency antenna 10 operates in the GSM 850/900 band and the GSM 1800/1900 band (or UMTS band), the impedance bandwidth of the multi-frequency antenna 10 can meet the 6 dB return loss requirement. Accordingly, the multi-frequency antenna 10 can have good radiation performance and can satisfy the frequency band used in the communication specifications of current general mobile phone products.

Please refer to FIG. 5. FIG. 5 is a graph showing frequency and return loss when the angle between the antenna ground plane of the multi-frequency antenna and the matching conductor is different according to the embodiment of the present invention. The curves C50, C52, and C54 represent the return loss curves when the angle α is 90 degrees, 135 degrees, and 180 degrees, respectively. It can be seen from FIG. 5 that even if the angle α is changed to adjust the radiation pattern, the multi-frequency antenna 10 provided by the embodiment of the present invention operates in the GSM 850/900 band, the GSM 1800/1900 band and the UMTS band, and the multi-frequency antenna 10 The impedance bandwidth still meets the 6dB return loss requirement.

[Another embodiment of a multi-frequency antenna]

Please refer to FIG. 6. FIG. 6 is a plan view of a multi-frequency antenna according to another embodiment of the present invention. The difference between the multi-frequency antenna 12 of FIG. 6 and the multi-frequency antenna 10 of FIG. 1 is that the angle α between the antenna ground plane 102 of the multi-frequency antenna 10 of FIG. 1 and the matching conductor 106 is 90 degrees. However, FIG. 6 The angle α between the antenna ground plane 122 of the multi-frequency antenna 12 and the matching conductor 126 is 180 degrees. As described above, the angle α between the antenna ground plane and the matching conductor may be between 0 and 180 degrees, and by adjusting the angle α, the radiation pattern of the multi-frequency antenna 10 can be controlled.

[Another embodiment of a multi-frequency antenna]

Please refer to FIG. 7. FIG. 7 is a plan view of a multi-frequency antenna according to another embodiment of the present invention. The difference between the multi-frequency antenna 14 of FIG. 7 and the multi-frequency antenna 10 of FIG. 1 is that one end of the matching conductor 106 of the multi-frequency antenna 10 of FIG. 1 is connected to the left side of the antenna ground plane 102. However, the multi-frequency of FIG. One end of the matching conductor 146 of the antenna 14 is connected to the middle of the antenna ground plane 142. As previously mentioned, the location of the connection between the mating conductor and the ground plane of the antenna is not intended to limit the invention.

[Another embodiment of a multi-frequency antenna]

Please refer to FIG. 8. FIG. 8 is a plan view of a multi-frequency antenna according to another embodiment of the present invention. The difference between the multi-frequency antenna 16 of FIG. 8 and the multi-frequency antenna 10 of FIG. 1 is that the matching conductor 106 of the multi-frequency antenna 10 of FIG. 1 is disposed on the left side of the antenna ground plane 102 and between the antenna ground plane 102. The angle α is 90 degrees. However, the matching conductor 166 of the multi-frequency antenna 16 of FIG. 8 is disposed on the right side of the antenna ground plane 162, and the angle α between the antenna ground plane 162 and the antenna ground plane 162 is 180 degrees. As previously mentioned, the position of the connection between the mating conductor and the ground plane of the antenna and the angle a are not intended to limit the invention.

[Another embodiment of a multi-frequency antenna]

Please refer to FIG. 9. FIG. 9 is a plan view of a multi-frequency antenna according to another embodiment of the present invention. The difference between the multi-frequency antenna 18 of FIG. 9 and the multi-frequency antenna 10 of FIG. 1 is that only one matching conductor 106 of the multi-frequency antenna 10 of FIG. 1 is disposed on the left side of the antenna ground plane 102. However, the multi-frequency of FIG. The antenna 18 has two matching conductors 186 and 188 respectively disposed on the left and right sides of the antenna ground plane 182, wherein the matching conductor 188 and the antenna ground plane 182 have an included angle β. In the present embodiment, the angle α and the included angle β are both 90 degrees, and the length of the matching conductor 188 is close to a quarter of the wavelength corresponding to any frequency of the second frequency band (for example, the medium frequency). As mentioned previously, the number of matching conductors of the multi-frequency antenna is not intended to limit the invention.

[Embodiment of Electronic Device with Multi-Frequency Antenna]

Please refer to FIG. 10. FIG. 10 is a perspective view of an electronic device with a multi-frequency antenna according to an embodiment of the present invention. The electronic device includes a multi-frequency antenna 10' and an electronic device body 20, and the multi-frequency antenna 10' in Fig. 10 may be the multi-frequency antenna of the foregoing embodiments. In this embodiment, the multi-frequency antenna 10' is disposed in the electronic device, and the multi-frequency antenna 10' can be disposed on the electronic device body 20 by using a fixing means, for example, using a copper post, a sponge or a connector. The multi-frequency antenna 10' is disposed on the electronic device body 20 in an equal manner. It should be noted that the various fixing means described above are not intended to limit the invention.

The electronic device body 20 includes a system ground plane 200, a cable line 202 and one or more electronic wafers 204. The electronic chip 204 is disposed on the system ground plane 200 for transmitting radio frequency signals to the multi-frequency antenna 10' or receiving the multi-frequency antenna. 10' RF signal. The electronic device body 20 may be a circuit board, a mobile phone device, a computer device, or the like. The signal feeding end and the signal ground end of the multi-frequency antenna 10' are electrically connected to the signal line and the ground line of the cable 202, respectively, in other words, the cable 202 is electrically connected to the multi-frequency antenna 10' and the electronic device body 20. Electronic chip 204. The antenna ground plane of the electronic device does not need to be integrated with the system ground plane 200, and the design cost of the design antenna can be reduced.

In summary, the embodiments of the present invention provide a multi-frequency antenna and an electronic device having the multi-frequency antenna. The multi-frequency antenna does not need to be integrated with the system ground plane, and can also have good radiation performance and multi-band operation. In other words, the multi-frequency antenna is an independent antenna, and the product manufacturer does not need to redesign the antenna for different electronic products, so the manufacturing cost can be reduced. In addition, the radiation pattern of the multi-frequency antenna can also be changed by adjusting the angle between the matching conductor and the ground plane of the antenna. In addition, this multi-frequency antenna can also be applied to a Multiple Input Multiple Output (MIMO) system.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

10, 10', 12, 14, 16, 18. . . Multi-frequency antenna

100. . . Antenna substrate

102, 122, 142, 162, 182. . . Antenna ground plane

104. . . Antenna unit

1041. . . Feed conductor

1042. . . Coupling conductor

1043. . . Radiation conductor

1044. . . Short-circuit conductor

106, 126, 146, 166, 186, 188. . . Matched conductor

20. . . Electronic device body

200. . . System ground plane

202. . . Cable

204. . . Electronic chip

C50, C52, C54. . . curve

S1, S2. . . spacing

α, β. . . Angle

A~G. . . End point

1 is a plan view of a multi-frequency antenna according to an embodiment of the present invention.

2 is a radiation pattern diagram of a multi-frequency antenna according to an embodiment of the present invention operating in a 925 megahertz band.

FIG. 3 is a radiation pattern diagram of a multi-frequency antenna according to an embodiment of the present invention operating in a frequency band of 1920 MHz.

4 is a graph of frequency and return loss of a multi-frequency antenna according to an embodiment of the present invention.

FIG. 5 is a graph showing frequency and reflection loss when the angle between the antenna ground plane of the multi-frequency antenna and the matching conductor is different according to the embodiment of the present invention.

FIG. 6 is a plan view of a multi-frequency antenna according to another embodiment of the present invention.

FIG. 7 is a plan view of a multi-frequency antenna according to another embodiment of the present invention.

FIG. 8 is a plan view of a multi-frequency antenna according to another embodiment of the present invention.

FIG. 9 is a plan view of a multi-frequency antenna according to another embodiment of the present invention.

FIG. 10 is a perspective view of an electronic device with a multi-frequency antenna according to an embodiment of the present invention.

10. . . Multi-frequency antenna

100. . . Antenna substrate

102. . . Antenna ground plane

104. . . Antenna unit

1041. . . Feed conductor

1042. . . Coupling conductor

1043. . . Radiation conductor

1044. . . Short-circuit conductor

106. . . Matched conductor

S1, S2. . . spacing

α. . . Angle

A~G. . . End point

Claims (20)

A multi-frequency antenna includes: an antenna substrate; an antenna ground plane disposed on the antenna substrate and having more than one bend and a signal ground; an antenna unit disposed on the antenna substrate adjacent to the antenna a grounding surface for providing a first operating band and a second operating band, wherein the antenna unit comprises: a coupling conductor; a feed conductor disposed between the antenna ground plane and the coupling conductor along the coupling The conductor extends and has a signal feeding end with respect to the ground end of the signal, wherein the feeding conductor and the coupling conductor have a first spacing; a radiation conductor is electrically connected to one end of the coupling conductor at the other end Or facing the antenna ground plane, wherein the radiation conductor and the antenna ground plane have a second spacing; and a short-circuit conductor, one end of which is electrically connected to the coupling conductor, and the other end of which is electrically connected to the antenna ground plane; a first matching conductor, one end of which is electrically connected to the ground plane of the antenna, and whose length is close to a quarter of a wavelength corresponding to a frequency of one of the first operating bands Wherein the first matching to the antenna ground plane conductor having a first angle. The multi-frequency antenna of claim 1, wherein the width of the ground plane of the antenna is less than or equal to one tenth of the length of the ground plane of the antenna. The multi-frequency antenna of claim 1, wherein the frequency of the first operating band is a center frequency of the first operating band. The multi-frequency antenna of claim 1, wherein the first angle ranges from 0 to 180 degrees. The multi-frequency antenna of claim 1, further comprising: a second matching conductor, one end of which is electrically connected to the ground plane of the antenna, and whose length is close to a wavelength corresponding to a frequency of one of the second operating bands One quarter, wherein the second matching conductor has a second angle with the antenna grounding mask. The multi-frequency antenna of claim 5, wherein the frequency of the first operating band is a center frequency of the first operating band, and the frequency of the second operating band is a center of the second operating band frequency. The multi-frequency antenna of claim 5, wherein the first angle and the second angle range between 0 and 180 degrees. The multi-frequency antenna of claim 1, wherein the matching conductor is a matching metal wire, the coupling conductor is a coupling metal wire, the feeding conductor is a feeding metal wire, and the radiation conductor is a radiation. a metal wire, and the short-circuit conductor is a short-circuited metal wire. The multi-frequency antenna of claim 1, wherein the antenna substrate is a long rectangular substrate. The multi-frequency antenna of claim 1, wherein the antenna ground plane is an elongated metal line segment. The multi-frequency antenna of claim 1, wherein the first operating band comprises a GSM 850/900 band and the second operating band comprises a GSM 1800/1900/UMTS band. The multi-frequency antenna of claim 1, wherein the first pitch is 0.5 cm. An electronic device includes: an electronic device body having a system ground plane, a cable and at least one electronic chip disposed on the ground plane of the system; and a multi-frequency antenna electrically connected through the cable The electronic chip of the electronic device body includes: an antenna substrate; an antenna ground plane disposed on the antenna substrate and having more than one bend and a signal ground end, wherein the signal ground end is electrically connected to the cable a grounding line of the line; an antenna unit disposed on the antenna substrate adjacent to the ground plane of the antenna and configured to provide a first operating frequency band and a second operating frequency band, wherein the antenna unit comprises: a coupling conductor; The input conductor is disposed between the ground plane of the antenna and the coupling conductor, extends along the coupling conductor, and has a signal feeding end with respect to the signal ground, wherein the feeding conductor and the coupling conductor have a a first spacing, and the signal feeding end is electrically connected to a signal line of the cable; a radiation conductor is electrically connected to the coupling conductor at one end thereof, The other end is facing the antenna ground plane, wherein the radiation conductor has a second spacing between the antenna ground plane; and a short-circuit conductor, one end of which is electrically connected to the coupling conductor, and the other end of which is electrically connected to the antenna connection a first matching conductor, one end of which is electrically connected to the ground plane of the antenna, and has a length close to a quarter of a wavelength corresponding to a frequency of the first operating frequency band, wherein the first matching conductor is connected to the antenna The ground has a first angle. The electronic device of claim 13, wherein the width of the ground plane of the antenna is less than or equal to one tenth of the length of the ground plane of the antenna. The electronic device of claim 13, wherein the first angle ranges from 0 to 180 degrees. The electronic device of claim 13, wherein the multi-frequency antenna further comprises: a second matching conductor, one end of which is electrically connected to the ground plane of the antenna, and the length of which is close to a frequency of the second operating band Corresponding to a quarter of the wavelength, wherein the second matching conductor has a second angle with the antenna grounding mask. The electronic device of claim 16, wherein the frequency of the first operating band is a center frequency of the first operating band, and the frequency of the second operating band is a center frequency of the second operating band . The electronic device of claim 16, wherein the first angle and the second angle are both between 0 and 180 degrees. The electronic device of claim 13, wherein the matching conductor is a matching metal wire, the coupling conductor is a coupling metal wire, the feeding conductor is a feeding metal wire, and the radiation conductor is a radiation metal a wire, and the short-circuit conductor is a short-circuited metal wire. The electronic device of claim 13, wherein the first operating band comprises a GSM 850/900 band and the second operating band comprises a GSM 1800/1900/UMTS band.