TWI423528B - Wide-band antenna - Google Patents

Description

Broadband antenna

The present invention relates to a wideband antenna, and more particularly to a broadband antenna that can be applied to a portable device and can transmit or receive a high frequency signal in the working frequency band of various mobile communication systems and the operating frequency band of the global positioning system.

In recent years, with the market and consumer demand, coupled with the development of technology in the microwave field, personal communication is booming and appealing light, thin, and short, so the size of the antenna design requires miniaturization, so as to be applied to various portable Devices, such as cell phones, personal digital assistants, or notebook computers. On the other hand, due to the continuous development of communication technologies, various mobile communication systems, such as Global System for Mobile (GSM), Wireless Local Area Network (WLAN) or Blue Buds (Bluetooth, BT) and the like are widely used.

However, because of the existence of various mobile communication systems as described above, the industry needs to provide a portable device that can be simultaneously applied to the above various mobile communication systems, so that consumers do not need to separately purchase different specifications for applying various mobile communication systems. Portable device. On the other hand, as consumers are increasingly demanding their own positioning, such as satellite navigation, the industry is gradually adding the Global Positioning System (GPS) function to portable devices. Therefore, for the industry, a wideband antenna capable of transmitting or receiving a high frequency signal in the working frequency band of various mobile communication systems and the operating frequency band of the global positioning system is required.

As shown in FIG. 1, the conventional wideband antenna includes a substrate 11, a grounding unit 12, a U-shaped microstrip antenna unit 13, and a U-shaped slot unit 14. The substrate 11 has an upper surface 111, and the grounding unit 12 and the U-shaped microstrip antenna unit 13 are formed on the upper surface 111. On the other hand, the grounding unit 12 is adjacent to the first side 112 of the substrate 11, the U-shaped microstrip antenna unit 13 is adjacent to the second side 113 of the substrate 11, and the second side 113 and the first side 112 are Located on opposite sides of the substrate 11, respectively.

As shown in FIG. 1 , the U-shaped microstrip antenna unit 13 includes a first vertical portion 131 , a second vertical portion 132 , and a horizontal portion 133 , and the horizontal portion 133 is respectively associated with the first vertical portion 131 and the first portion The two vertical portions 132 are connected, and the second vertical portion 132 is adjacent to the second side 113 of the substrate 11. In addition, the U-shaped slot unit 14 is formed on a side of the ground unit 12 adjacent to the U-shaped microstrip antenna unit 13 and includes a first vertical slot portion 141, a second vertical slot portion 142, and a horizontal slot. Part 143. The horizontal slot portion 143 is respectively connected to the first vertical slot portion 141 and the second vertical slot portion 142, and the second vertical slot portion 142 is adjacent to the first vertical portion 131 of the U-shaped microstrip antenna unit 13. The horizontal slot portion 143 is parallel to the horizontal portion 133 of the U-shaped microstrip antenna unit 13.

However, as shown in FIG. 2, the conventional wideband antenna can be applied to a wireless local area network (WLAN) because its return loss in the operating band of the wireless local area network (about 2400 MHz) is lower than 7.3. dB, but the conventional wideband antenna cannot be applied to global positioning systems because the return loss of the conventional wideband antenna in the operating frequency band of the global positioning system (about 1575 MHz + -5 MHz) is higher than 7.3 dB.

Therefore, there is a need in the industry for a broadband antenna that can be applied to a portable device and that can transmit or receive a high frequency signal in the operating band of various mobile communication systems and the operating frequency band of the global positioning system.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a wideband antenna that can be used in a portable device with a smaller size.

Another object of the present invention is to provide a wideband antenna capable of transmitting or receiving a high frequency signal in the operating frequency band of various mobile communication systems and the operating frequency band of the global positioning system.

To achieve the above objective, the wideband antenna of the present invention is applied to a portable device and can transmit or receive a high frequency signal in a working frequency band of a global positioning system, including: a substrate having an upper surface; a grounding unit is formed on the upper surface and adjacent to a first side of the substrate; a U-shaped microstrip antenna unit is formed on the upper surface and adjacent to a second side of the substrate, and the second The side and the first side are respectively located on opposite sides of the substrate, and the U-shaped microstrip antenna unit comprises a first vertical portion, a second vertical portion and a horizontal portion, and the horizontal portion is respectively The first vertical portion is connected to the second vertical portion, and the second vertical portion is adjacent to the second side portion; a U-shaped slot unit is formed in the grounding unit adjacent to the U-shaped microstrip antenna unit a side, the U-shaped slot unit comprises a first vertical slot portion, a second vertical slot portion and a horizontal slot portion, and the horizontal slot portion is respectively associated with the first vertical slot portion a second vertical slot portion connected, the second vertical slot portion being adjacent to First vertical portion, the horizontal portion of the slot is parallel to this horizontal portion; and a side extending slot means formed adjacent thereto a ground-based unit of this U-shaped slot element. Wherein the extended slot unit extends from the first vertical slot portion and the horizontal slot portion in a direction parallel to and away from the first vertical slot portion toward the third side of the substrate The third side is perpendicular to the second side.

Therefore, the wideband antenna of the present invention comprises a substrate, a grounding unit, a U-shaped microstrip antenna unit, a U-shaped slot unit and an extended slot unit, and the extended slot unit is from the U-shaped slot unit. The connection between the first vertical slot portion and the horizontal slot portion extends toward the third side of the substrate in a direction parallel to and away from the first vertical slot portion of the U-shaped slot unit, so the broadband of the present invention The antenna can transmit or receive a high frequency signal not only in the working frequency band of various mobile communication systems (such as global standard/pan-European digital mobile phone system, wireless local area network or Bluetooth), but also the broadband antenna of the present invention can be used. A high frequency signal is transmitted or received in the operating frequency band of the global positioning system. In addition, since the substrate of the wideband antenna of the present invention has a very small substrate size, the wideband antenna of the present invention can be easily applied to a portable device such as a mobile phone, a personal assistant, a notebook computer or the like. That is to say, the wideband antenna of the present invention can be applied not only to a portable device, but also to transmitting or receiving a high frequency signal in the working frequency band of various mobile communication systems and the operating frequency band of the global positioning system.

Please refer to FIG. 3 , which is a schematic diagram of a broadband antenna according to an embodiment of the present invention. The broadband antenna according to an embodiment of the present invention includes a substrate 31 , a grounding unit 32 , a U-shaped microstrip antenna unit 33 , and a U shape . The slot unit 34 and an extended slot unit 35. Further, the substrate 31 has an upper surface 311, and the grounding unit 32 and the U-shaped microstrip antenna unit 33 are formed on the upper surface 311. On the other hand, the grounding unit 32 is adjacent to the first side 312 of the substrate 31, the U-shaped microstrip antenna unit 33 is adjacent to the second side 313 of the substrate 31, and the second side 313 and the first side 312 are They are located on opposite sides of the substrate 31, respectively.

As shown in FIG. 3, the U-shaped microstrip antenna unit 33 includes a first vertical portion 331, a second vertical portion 332, and a horizontal portion 333, and the horizontal portion 333 is respectively associated with the first vertical portion 331 and the first portion. The two vertical portions 332 are connected, and the second vertical portion 332 is adjacent to the second side 313 of the substrate 31. In addition, the U-shaped slot unit 34 is formed on a side of the ground unit 32 adjacent to the U-shaped microstrip antenna unit 33 and includes a first vertical slot portion 341, a second vertical slot portion 342, and a horizontal slot. Part 343. The horizontal slot portion 343 is connected to the first vertical slot portion 341 and the second vertical slot portion 342, respectively, and the second vertical slot portion 342 is adjacent to the first vertical portion 331 of the U-shaped microstrip antenna unit 33. The horizontal slot portion 343 is parallel to the horizontal portion 333 of the U-shaped microstrip antenna unit 33.

Referring to FIG. 3 and FIG. 4, FIG. 4 is a partially enlarged schematic view of a wideband antenna according to an embodiment of the present invention, which is an enlarged view showing a portion of the broadband antenna adjacent to the extended slot unit 35 thereof according to an embodiment of the present invention. As shown in FIG. 3 and FIG. 4, the extended slot unit 35 of the broadband antenna according to an embodiment of the present invention is formed on one side of the ground unit 32 adjacent to the U-shaped slot unit 34. Moreover, the extending slot unit 35 is from the junction of the first vertical slot portion 341 of the U-shaped slot unit 34 and the horizontal slot portion 343 to be parallel and away from the first vertical slot portion of the U-shaped slot unit 34. The direction of 341 extends toward the third side 314 of the substrate 31. On the other hand, as shown in FIG. 3, the third side 314 of the substrate 31 is perpendicular to the second side 313 of the substrate 31 described above.

In this embodiment, the substrate 31 is a rectangular FR-4 substrate, and the long side (ie, the third side 314) has a length of 100 mm, and the short side (ie, the first side 312 and The length of the second side 313) is 40 mm. That is, the length of the third side 314 of the substrate 31 is greater than the length of the second side 313 of the substrate 31. In addition, in the embodiment, the first vertical portion 331, the second vertical portion 332, and the horizontal portion 333 of the U-shaped microstrip antenna unit 33 have the same width, such as a first width. On the other hand, the first vertical slot portion 341, the second vertical slot portion 342, and the horizontal slot portion 343 of the U-shaped slot unit 34 all have the same width, such as a second width. Moreover, as shown in FIG. 3, in the present embodiment, the first width is equal to the second width, both of which are 3 mm. However, it should be noted that the first width may not be equal to the second width in different application aspects. In addition, in the present embodiment, the width of the extended slot unit 35 is the same as the width of the first vertical slot portion 341 of the U-shaped slot unit 34, that is, 3 mm. Finally, the grounding unit 32 and the U-shaped microstrip antenna unit 33 are each made of a conductive metal material, such as a copper foil.

As shown in FIG. 4, the length of the extended slot unit 35 of the wideband antenna of the present invention is represented by L1, and in different embodiments, the extended slot units 35 may have different lengths. However, in the present embodiment, the length of the extended slot unit 35 is 10 mm (i.e., L1 = 10 mm). That is, in the wideband antenna according to an embodiment of the present invention, the extended slot unit 35 is connected from the first vertical slot portion 341 of the U-shaped slot unit 34 to the horizontal slot portion 343 to be parallel and far away. The direction of the first vertical slot portion 341 extends a length of 10 mm toward the third side 314 of the substrate 31 up to the third side 314 of the substrate 31.

When the broadband antenna of the present invention is in operation, the broadband antenna of the present invention is electrically connected to a coaxial cable (not shown), wherein the signal unit (not shown) of the coaxial cable is combined with the broadband antenna of the present invention. The U-shaped microstrip antenna unit 33 is electrically connected, and the grounding unit (not shown) of the coaxial cable is electrically connected to the grounding unit 32 of the broadband antenna of the present invention.

Fig. 5 is a view showing the voltage standing wave ratio (VSWR) of the wideband antenna of the present invention obtained by simulation when the extended slot unit of the wideband antenna of the present invention has different lengths. Among them, the aforementioned simulation uses an electromagnetic soft body (for example, an HFSS electromagnetic soft body introduced by Ansoft Corporation) to perform simulation. In addition, in FIG. 5, the curve A represents a case where the length of the extended slot unit of the wideband antenna of the present invention is 5 mm (L1=5 mm), and the curve B represents the extended slot of the wideband antenna of the present invention. In the case where the length of the unit is 9 mm (L1 = 9 mm), the curve C represents a case where the length of the extended slot unit of the wideband antenna according to an embodiment of the present invention is 10 mm (L1 = 10 mm).

As can be seen from FIG. 5, the voltage standing wave ratio of the two broadband antennas in the operating frequency band of the global positioning system (about 1575 MHz + -5 MHz) is much larger than that in the case represented by curve A or curve B. :1, making these two broadband antennas unable to transmit or receive a high frequency signal in the operating frequency band of the global positioning system. However, in the case represented by the curve C (L1 = 10 mm), that is, the aspect of the broadband antenna according to an embodiment of the present invention, the voltage standing wave ratio is not only in the operating band of the global positioning system (about 1575 MHz + -5 MHz). The standing wave ratio is less than 3:1, and the broadband antenna of an embodiment of the present invention has a voltage standing wave ratio of less than 3:1 in a larger operating frequency band, such as 900 MHz to 1850 MHz. Therefore, the broadband antenna according to an embodiment of the present invention can not only transmit or receive a high frequency signal in the working frequency band of the global positioning system, but also can be used in other working frequency bands, such as a global standard/pan-European digital mobile phone system, A wireless local area network or Bluetooth (between 900MHz and 1850MHz) transmits or receives a high frequency signal.

On the other hand, Fig. 6 is a view showing the voltage standing wave ratio (VSWR) of the wideband antenna of the present invention obtained by actual measurement when the extended slot unit of the wideband antenna of the present invention has different lengths. In FIG. 6, the curve D represents a case where the length of the extended slot unit of the wideband antenna of the present invention is 5 mm (L1=5 mm), and the curve E represents the extended slot unit of the wideband antenna of the present invention. In the case of a length of 9 mm (L1 = 9 mm), the curve F represents a case where the length of the extended slot unit of the wideband antenna according to an embodiment of the present invention is 10 mm (L1 = 10 mm).

In addition, in the two cases represented by the aforementioned curve E and the curve F, that is, L1=9 mm and L1=10 mm, the radiation efficiency of the broadband antenna of the present invention at different operating frequencies is as follows. 1 shows:

As can be seen from Table 1, in the case represented by the curve F (L1 = 10 mm), the radiation efficiency of the broadband antenna according to an embodiment of the present invention in the operating band (1575 MHz) of the aforementioned global positioning system is greater than 60%. , reaching 64.6%. That is, the wideband antenna according to an embodiment of the present invention can transmit or receive a high frequency signal (because its voltage standing wave ratio is less than 3:1) in the operating frequency band (about 1575 MHz + -5 MHz) of the aforementioned global positioning system. ), it is more efficient to transmit or receive a high frequency signal (since its radiation efficiency is greater than 60%). Moreover, as described above, the wideband antenna of the embodiment of the present invention has a very small substrate size of only 100 mm X 40 mm, so that the wideband antenna according to an embodiment of the present invention can be easily applied to a portable device. For example, mobile phones, personal assistants, notebook computers, etc. Therefore, by using the wideband antenna according to an embodiment of the present invention, the aforementioned portable device can provide its own positioning function at any time by using a global positioning system.

FIG. 7 is a schematic diagram of a broadband antenna according to another embodiment of the present invention. The broadband antenna of another embodiment of the present invention includes a substrate 71, a grounding unit 72, a U-shaped microstrip antenna unit 73, and a A U-shaped slot unit 74, an extended slot unit 75 and an auxiliary slot unit 76. Further, the substrate 71 has an upper surface 711, and the grounding unit 72 and the U-shaped microstrip antenna unit 73 are formed on the upper surface 711. On the other hand, the grounding unit 72 is adjacent to the first side 712 of the substrate 71, the U-shaped microstrip antenna unit 73 is adjacent to the second side 713 of the substrate 71, and the second side 713 and the first side 712 are They are located on opposite sides of the substrate 71, respectively.

As shown in FIG. 7, the U-shaped microstrip antenna unit 73 includes a first vertical portion 731, a second vertical portion 732, and a horizontal portion 733, and the horizontal portion 733 is respectively associated with the first vertical portion 731 and the first portion. The two vertical portions 732 are connected, and the second vertical portion 732 is adjacent to the second side 713 of the substrate 71. In addition, a U-shaped slot unit 74 is formed on a side of the ground unit 72 adjacent to the U-shaped microstrip antenna unit 73 and includes a first vertical slot portion 741, a second vertical slot portion 742, and a horizontal slot. Department 743. The horizontal slot portion 743 is connected to the first vertical slot portion 741 and the second vertical slot portion 742, respectively, and the second vertical slot portion 742 is adjacent to the first vertical portion 731 of the U-shaped microstrip antenna unit 73. The horizontal slot portion 743 is parallel to the horizontal portion 733 of the U-shaped microstrip antenna unit 73.

Referring to FIG. 7 and FIG. 8 , FIG. 8 is a partially enlarged schematic view of a broadband antenna according to another embodiment of the present invention, which is an enlarged view showing a portion of the broadband antenna adjacent to the slot unit 75 of the other embodiment of the present invention. . As shown in FIG. 7 and FIG. 8, the extended slot unit 75 of the wideband antenna according to another embodiment of the present invention is formed on one side of the ground unit 72 adjacent to the U-shaped slot unit 74. Moreover, the extending slot unit 75 is from the junction of the first vertical slot portion 741 of the U-shaped slot unit 74 and the horizontal slot portion 743 to be parallel and away from the first vertical slot portion of the U-shaped slot unit 74. The direction of 741 extends toward the third side 714 of the substrate 71. On the other hand, as shown in FIG. 7, the third side 714 of the substrate 71 is perpendicular to the second side 713 of the substrate 71 described above. As shown in FIG. 8, the auxiliary slot unit 76 is from one end of the third side 714 of the adjacent slot 71 of the slot unit 75, and faces the substrate 71 in a direction parallel to the third side 714 of the substrate 71. The first side 712 extends.

In this embodiment, the substrate 71 is a rectangular FR-4 substrate, and the long side (ie, the third side 714) has a length of 100 mm, and the short side (ie, the first side 712 and The length of the second side 713) is 40 mm. That is, the length of the third side 714 of the substrate 71 is greater than the length of the second side 713 of the substrate 71. In addition, in the present embodiment, the first vertical portion 731, the second vertical portion 732, and the horizontal portion 733 of the U-shaped microstrip antenna unit 73 have the same width, such as a first width. On the other hand, the first vertical slot portion 741, the second vertical slot portion 742, and the horizontal slot portion 743 of the U-shaped slot unit 74 all have the same width, such as a second width. Moreover, as shown in Fig. 7, in the present embodiment, the first width is equal to the second width, both of which are 3 mm. However, it should be noted that the first width may not be equal to the second width in different application aspects. In addition, in the present embodiment, the width of the extended slot unit 75 is the same as the width of the first vertical slot portion 741 of the U-shaped slot unit 74, and the slot unit 75 and the auxiliary slot unit 76 are extended. They also have the same width, that is, the width of the extended slot unit 75 and the auxiliary slot unit 76 are both 3 mm. Finally, the grounding unit 72 and the U-shaped microstrip antenna unit 73 are each made of a conductive metal material, such as a copper foil.

As shown in Fig. 8, the length of the extended slot unit 75 of the wideband antenna of the present invention is denoted by L1, and the length of the auxiliary slot unit 76 is denoted by L2. Moreover, in various embodiments, the auxiliary slot units 76 can have different lengths. In the present embodiment, the length of the extended slot unit 75 is 9 mm (i.e., L1 = 9 mm), and the length of the auxiliary slot unit 76 is 46 mm (i.e., L2 = 46 mm). That is, in the wideband antenna according to another embodiment of the present invention, the extended slot unit 75 is connected from the first vertical slot portion 741 of the U-shaped slot unit 74 to the horizontal slot portion 743, and is parallel. The direction away from the first vertical slot portion 741 extends toward the third side 714 of the substrate 71 by a length of 9 mm. Then, the auxiliary slot unit 76 extends from the end of the third side 714 of the adjacent substrate 71 of the slot unit 75 toward the first side 712 of the substrate 71 in a direction parallel to the third side 714 of the substrate 71. Extends the length of 46mm.

When the broadband antenna of the present invention is in operation, the broadband antenna of the present invention is electrically connected to a coaxial cable (not shown), wherein the signal unit (not shown) of the coaxial cable is combined with the broadband antenna of the present invention. The U-shaped microstrip antenna unit 73 is electrically connected, and the grounding unit (not shown) of the coaxial cable is electrically connected to the grounding unit 72 of the broadband antenna of the present invention.

Figure 9 is a diagram showing the voltage standing wave ratio (VSWR) of the wideband antenna of the present invention obtained by simulation when the auxiliary slot unit of the wideband antenna of the present invention has different lengths. Among them, the aforementioned simulation uses an electromagnetic soft body (for example, an HFSS electromagnetic soft body introduced by Ansoft Corporation) to perform simulation. Further, in Fig. 9, the curve G represents a case where the length of the auxiliary slot unit of the wideband antenna of the present invention is 26 mm (L2 = 26 mm), and the curve H represents a wideband antenna of another embodiment of the present invention. The length of the auxiliary slot unit is 46 mm (L2 = 46 mm), and the curve I represents the case where the length of the slot unit of the wideband antenna of the present invention is 74 mm (L2 = 74 mm).

As can be seen from FIG. 9, in the case of the curve I, the voltage standing wave ratio of the wideband antenna in the operating frequency band of the global positioning system (about 1575 MHz + -5 MHz) is much larger than 3:1, so that the broadband antenna cannot A high frequency signal is transmitted or received within the operating frequency band of the global positioning system. On the other hand, in the case of the curve G, the broadband standing wave ratio of the operating band of the global positioning system (about 1575 MHz + -5 MHz) is less than 3:1, but it has a very high between 1000 MHz and 1300 MHz. The high stop band allows the wideband antenna to transmit or receive a high frequency signal in the operating band of the global positioning system, but its application range is greatly limited by the presence of the aforementioned cutoff band.

However, in the case represented by the curve H (L2 = 46 mm), that is, the aspect of the wideband antenna of another embodiment of the present invention, the voltage standing wave ratio is not only in the operating band of the global positioning system (about 1575 MHz + -5 MHz). The voltage standing wave ratio is less than 3:1, and the broadband antenna of another embodiment of the present invention has a voltage standing wave ratio of less than 3:1 in a larger operating frequency band, such as 1000 MHz to 1700 MHz. Therefore, the wideband antenna of another embodiment of the present invention can not only transmit or receive a high frequency signal in the working frequency band of the global positioning system, but also can be used in working bands of other applications, such as a global standard/pan-European digital mobile phone system. , wireless local area network or Bluetooth (between 1000MHz and 1700MHz), transmitting or receiving a high frequency signal.

On the other hand, Fig. 10 shows the voltage standing wave ratio (VSWR) of the wideband antenna of the present invention obtained by actual measurement when the auxiliary slot unit of the wideband antenna of the present invention has different lengths. In Fig. 10, a curve J represents a case where the length of the auxiliary slot unit of the wideband antenna of the present invention is 25.5 mm (L2 = 25.5 mm), and a curve K represents a wideband antenna of another embodiment of the present invention. The length of the auxiliary slot unit is 45.5 mm (L2 = 45.5 mm), and the curve L represents the case where the length of the auxiliary slot unit of the wideband antenna of the present invention is 74 mm (L2 = 74 mm).

In addition, in the two cases represented by the aforementioned curve J and the curve L, that is, L2=26 mm and L2=74 mm, the radiation efficiency of the broadband antenna of the present invention at different operating frequencies is as follows. 2 shows:

Table 2

It can be seen from Table 2 that the wideband antenna of the present invention operates in the operating frequency band of the global positioning system (1575 MHz) even in the two cases represented by the curve J and the curve L, that is, L2=26 mm and L2=74 mm. The radiation efficiency is greater than 60%, reaching 71.9% and 73.2%, respectively. Therefore, the radiation efficiency of the wideband antenna in another embodiment of the present invention in the operating frequency band (1575 MHz) of the global positioning system is also necessarily greater than 60%. As such, the broadband antenna of another embodiment of the present invention can transmit or receive a high frequency signal (because its voltage standing wave ratio is less than 3:1) in the operating frequency band (about 1575 MHz + -5 MHz) of the aforementioned global positioning system. It can transmit or receive a high frequency signal more efficiently (since its radiation efficiency is greater than 60%). Moreover, as described above, the wideband antenna of another embodiment of the present invention has a very small substrate size of only 100 mm X 40 mm, so that the wideband antenna of another embodiment of the present invention can be easily applied to a portable type. Devices such as mobile phones, personal assistants, notebook computers, and the like. Therefore, by using the wideband antenna of another embodiment of the present invention, the aforementioned portable device can provide its own positioning function at any time by using a global positioning system.

In summary, the wideband antenna of the present invention includes a substrate, a grounding unit, a U-shaped microstrip antenna unit, a U-shaped slot unit, and an extended slot unit, and the extended slot unit is U-shaped. a connection between the first vertical slot portion of the slot unit and the horizontal slot portion extends in a direction parallel to and away from the first vertical slot portion of the U-shaped slot unit toward a third side of the substrate, so The inventive wideband antenna can transmit or receive a high frequency signal not only in the working frequency band of various mobile communication systems (such as global standard/pan-European digital mobile phone system, wireless local area network or Bluetooth, etc.), and the broadband of the present invention The antenna can also transmit or receive a high frequency signal in the operating frequency band of the global positioning system. In addition, since the substrate of the wideband antenna of the present invention has a very small substrate size, the wideband antenna of the present invention can be easily applied to a portable device such as a mobile phone, a personal assistant, a notebook computer or the like. That is to say, the wideband antenna of the present invention can be applied not only to a portable device, but also to transmitting or receiving a high frequency signal in the working frequency band of various mobile communication systems and the operating frequency band of the global positioning system.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

11, 31, 71. . . Substrate

12, 32, 72. . . Grounding unit

13, 33, 73. . . U-shaped microstrip antenna unit

14, 34, 74. . . U-shaped slot unit

35, 75. . . Extended slot unit

76. . . Auxiliary slot unit

111, 311, 711. . . Upper surface

112, 312, 712. . . First side

113, 313, 713. . . Second side

314, 714. . . Third side

131, 331, 731. . . First vertical part

132, 332, 732. . . Second vertical part

133, 333, 733. . . Horizontal department

143, 343, 743. . . Horizontal slot

141, 341, 741. . . First vertical slot

142, 342, 742. . . Second vertical slot

Figure 1 is a schematic illustration of a conventional wideband antenna.

Figure 2 is a schematic diagram showing the return loss of a conventional wideband antenna obtained by actual measurement.

3 is a schematic diagram of a broadband antenna according to an embodiment of the present invention.

4 is a partially enlarged schematic view of a broadband antenna according to an embodiment of the present invention.

Fig. 5 is a view showing the voltage standing wave ratio of the wideband antenna of the present invention obtained by simulating when the extended slot unit of the wideband antenna of the present invention has different lengths.

Fig. 6 is a view showing the voltage standing wave ratio of the wideband antenna of the present invention obtained by actual measurement when the extended slot unit of the wideband antenna of the present invention has different lengths.

7 is a schematic diagram of a broadband antenna according to another embodiment of the present invention.

FIG. 8 is a partially enlarged schematic view showing a broadband antenna according to another embodiment of the present invention.

Fig. 9 is a view showing the voltage standing wave ratio of the wideband antenna of the present invention obtained by simulation when the auxiliary slot unit of the wideband antenna of the present invention has different lengths.

Fig. 10 is a view showing the voltage standing wave ratio of the wideband antenna of the present invention obtained by actual measurement when the auxiliary slot unit of the wideband antenna of the present invention has different lengths.

31. . . Substrate

32. . . Grounding unit

33. . . U-shaped microstrip antenna unit

34. . . U-shaped slot unit

35. . . Extended slot unit

311. . . Upper surface

312. . . First side

313. . . Second side

314. . . Third side

331. . . First vertical part

332. . . Second vertical part

333. . . Horizontal department

341. . . First vertical slot

342. . . Second vertical slot

343. . . Horizontal slot

Claims (9)

A wideband antenna is applied to a portable device and can transmit or receive a high frequency signal in a working frequency band of a global positioning system, comprising: a substrate having an upper surface; and a grounding unit formed on the An upper surface adjacent to a first side of the substrate; a U-shaped microstrip antenna unit formed on the upper surface and adjacent to a second side of the substrate, and the second side and the first side The sidebands are respectively located on opposite sides of the substrate, and the U-shaped microstrip antenna unit comprises a first vertical portion, a second vertical portion and a horizontal portion, and the horizontal portion and the first vertical portion respectively a second vertical portion is connected, the second vertical portion is adjacent to the second side; a U-shaped slot unit is formed on a side of the grounding unit adjacent to the U-shaped microstrip antenna unit, the U-shaped slot The unit includes a first vertical slot portion, a second vertical slot portion and a horizontal slot portion, and the horizontal slot portion is respectively connected to the first vertical slot portion and the second vertical slot portion The second vertical slot portion is adjacent to the first vertical portion, the level The hole portion is parallel to the horizontal portion; and an extended slot unit is formed on a side of the grounding unit adjacent to the U-shaped slot unit; wherein the extended slot unit is from the first vertical slot portion The connection with the horizontal slot portion extends in a direction parallel to and away from the first vertical slot portion toward a third side of the substrate, the third side being perpendicular to the second side. The wideband antenna of claim 1, wherein the substrate is a rectangular FR-4 substrate, and the length of the third side is greater than the length of the second side. The broadband antenna of claim 1, wherein the first vertical portion, the second vertical portion, and the horizontal portion each have the same width. The wideband antenna according to claim 1, wherein the grounding unit and the U-shaped microstrip antenna unit are made of a conductive metal material. The broadband antenna according to claim 1, wherein the first vertical slot portion, the second vertical slot portion and the horizontal slot portion have the same width. The wideband antenna of claim 1, wherein the extended slot unit extends to a third side of the substrate. The broadband antenna according to claim 1, further comprising an auxiliary slot unit formed on a side of the ground unit adjacent to the third side, the auxiliary slot unit being from the extended slot unit An end adjacent to the third side of the substrate extends toward the first side of the substrate in a direction parallel to the third side. The broadband antenna of claim 7, wherein the extended slot unit has the same width as the auxiliary slot unit. The broadband antenna of claim 1, wherein the broadband antenna has a radiation efficiency greater than 60% in an operating frequency band of the global positioning system.