CN1761104A - Dual-frequency antenna device, wireless communication device and radio frequency chip using the device - Google Patents

Abstract

A dual-band antenna device is used for operating in a first frequency band and a second frequency band. The dual-band antenna device includes: a first radiator and a second radiator. The first radiator is composed of a single path with at least two turns. Wherein, part of the second radiator is parallel to part of the first radiator with a predetermined distance. In addition, a wireless communication device and a radio frequency chip applying the dual-frequency antenna device are also disclosed.

Description

Dual-frequency antenna device, wireless communication device and radio frequency chip using the device

technical field

The present invention relates to an antenna device, in particular to a dual-frequency antenna device, a wireless communication device and a radio frequency chip using the above-mentioned dual-frequency antenna device.

Background technique

Personal mobile communication devices or wireless terminal equipment mainly appeal to light, thin, short, small and good communication quality; taking mobile phones as an example, the streamlined appearance and small appearance, coupled with good call quality and low price are Currently the most important design focus.

At present, most personal mobile communication devices or wireless terminal equipment, such as mobile phones, use exposed wire antennas. This type of antenna protrudes from the outside of the mobile phone, which not only makes the appearance of the mobile phone unsightly , the protruding part is also inconvenient for the user to carry. Furthermore, the production cost of the exposed antenna is higher than that of the general planar antenna, and the design of dual-band or multi-band operation is relatively complicated, and an impedance matching circuit is often required at the circuit end before it can be used.

Contents of the invention

The present invention relates to a dual-frequency antenna device, which adopts a polygonal-like planar antenna (planar antenna) design that is easy to adjust the dual-frequency resonance characteristics of the antenna, and saves characteristics under the advantages of simple design criteria and no need for an external impedance matching circuit. The time it takes to fine-tune and thus achieve rapid production.

The present invention relates to a wireless communication device. Using the above-mentioned dual-frequency antenna device and building the antenna device inside the wireless communication device can make the appearance design of the wireless communication device more flexible and beautiful, and reduce the production cost of the antenna. It is also lower than using an exposed antenna.

The present invention relates to a radio frequency chip module, which integrates the above-mentioned dual-band antenna device and radio frequency circuit unit into a single chip by using semiconductor process technology, so as to provide manufacturers with more convenience in making light, thin, short and small wireless communication devices .

According to a dual-band antenna device provided by an embodiment of the present invention, the antenna device can operate in a first frequency band and a second frequency band. The dual-band antenna device mainly includes: a first radiator and a second radiator. The above-mentioned first radiator has a single path with at least two turns. The above path has a first end and a second end. The first end feeds signals into the first radiator, and the second radiator is connected to the second end. Wherein, part of the second radiator is parallel to part of the first radiator with a predetermined distance.

A wireless communication device proposed according to another embodiment of the present invention mainly applies the dual-frequency antenna device proposed by the present invention. The wireless communication device includes: a radio frequency module for processing wireless signals; and a dual-frequency antenna device coupled to the radio frequency module for receiving or transmitting wireless signals operating in a first frequency band and a second frequency band. The dual-frequency antenna device includes: a first radiator and a second radiator. The above-mentioned first radiator has a single path with at least two turns. The above path has a first end and a second end. The first end feeds signals into the first radiator, and the second radiator is connected to the second end. Wherein, part of the second radiator is parallel to part of the first radiator with a predetermined distance.

A radio frequency chip proposed according to another embodiment of the present invention integrates the dual-frequency antenna device proposed by the present invention into a chip, and the radio frequency chip includes: a substrate, and a radio frequency circuit unit formed on the substrate , for processing wireless signals; and, a dual-frequency antenna device disposed on the substrate and coupled to the radio frequency circuit unit for receiving or transmitting wireless signals operating in a first frequency band and a second frequency band. The dual-band antenna device includes: a first radiator and a second radiator. The above-mentioned first radiator has a single path with at least two turns. The above path has a first end and a second end. The first end feeds signals into the first radiator, and the second radiator is connected to the second end. Wherein, part of the second radiator is parallel to part of the first radiator with a predetermined distance.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, several preferred embodiments are specifically cited below, together with the accompanying diagrams, and described in detail as follows.

Description of drawings

Figure 1a and Figure 1b show the schematic diagrams of two embodiments of the dual-frequency antenna device proposed by the present invention;

2a to 2b show schematic diagrams of two other embodiments of the dual-frequency antenna device proposed by the present invention;

3a to 3c show schematic diagrams of another three embodiments of the dual-frequency antenna device proposed by the present invention;

Fig. 4 shows the frequency response diagram of the dual frequency antenna device shown in Fig. 3a to Fig. 3c;

FIG. 5 shows a schematic diagram of another embodiment of a dual-frequency antenna device proposed based on the architecture shown in FIG. 3a;

Fig. 6 shows the return loss frequency response graph of the dual-frequency antenna device shown in Fig. 5 under the third path conductor with different lengths;

FIG. 7 shows a schematic diagram of another embodiment of a dual-band antenna device proposed based on the architecture shown in FIG. 3a;

Fig. 8 shows a schematic diagram of another embodiment of a dual-frequency antenna device combining the features of the embodiments shown in Fig. 5 and Fig. 7;

Fig. 9a shows a schematic diagram of an embodiment of a wireless communication device applying the dual-frequency antenna device of the present invention;

FIG. 9b shows a schematic diagram of another embodiment of a wireless communication device applying the dual-frequency antenna device of the present invention;

FIG. 10 shows a schematic diagram of a dual-frequency antenna device being folded at about 90 degrees along the folding lines F1 and F2 to have a three-dimensional structure and then connected to the printed circuit board 101;

Figure 11a shows a schematic diagram of an embodiment of a radio frequency chip applying the dual-frequency antenna device of the present invention; and

FIG. 11 b shows a schematic diagram of another embodiment of a radio frequency chip applying the dual-frequency antenna device of the present invention.

Symbol Description:

10, 20, 30, 98, 99, 100, 112 Dual frequency antenna device

R1, 21, 31 The first radiator

R2, 22, 32 Second radiator

R1 ₁ ～R1 ₆ , 21 ₁ ～21 ₃ , 31 ₁ ～31 ₄ first path conductor

R2 ₁ to R2 ₃ , 22 ₁ , 32 ₁ to 32 ₂ second path conductor

T1～T5, t1～t3 Turning point

D, d ₁ ~ d ₃ predetermined distance

F Signal feed point

f ₁ first resonant frequency

f ₂ , f ₂ ′, f ₂ ″ second resonant frequency

f ₃ , f ₃ ′ third resonant frequency

50 Third Path Conductor

61～63 Frequency response curve

70 Grounding conductor

G Termination of ground conductor 70

9 Wireless communication device

90, 101 are circuit substrates

92 radio frequency module

94 Baseband Module

96 Power Management Module

A output point of the circuit board

95 ground plane

F1, F2 Folding line

110 Substrate

111 radio frequency circuit unit

113 Isolation layer

115 through hole

Detailed ways

FIG. 1a shows a schematic diagram of an embodiment of the dual-band antenna device proposed by the present invention. The dual-band antenna device 10 can operate in a first frequency band and a second frequency band, which includes: a first radiator R1 connected by a plurality of first path conductors (here six first path conductors R1 ₁ to R1 ₆ is taken as an example, but not limited thereto), and constitutes a single path with 5 turns (T1-T5); wherein, the first path conductors R1 ₁ -R1 ₆ have different extending directions from each other; a signal A feed-in point F is set at a first end of the first radiator R1 for feeding signals into the first radiator R1; and a second radiator R2 is connected to one end of the first radiator R1 The second end is also connected to the first path conductor R1 ₆ .

Wherein, the second radiator R2 can be composed of a second path conductor R2 ₁ ( FIG. 1a ), or a single path formed by connecting multiple second path conductors R2 ₁ to R2 ₃ as shown in FIG. 1b . The path conductors R2 ₁ -R2 ₃ may extend in different directions. A part of the second radiator R2, such as the second path conductor R2 ₁ , is parallel to the first path conductor R1 ₁ , and there is a predetermined distance D between them.

又，该第二频带的中心频率(以下称为第二共振频率，对应的波长为λ₂)，是取决于该第一与第二辐射体的总长度，以图1a为例也即第一路径导体R1₁～Rl₆与第二路径导体R2₁的长度总合。此外，该第一共振频率与该第二共振频率两者间具有一特定的倍数关系，而且该倍数关乃是取决于该既定距离D的大小。因此，该双频天线装置的设计者，即可以通过变化该既定距离D的大小及该第二辐射体R2的总长度，而对该第二频带的中心频率进行控制。在此实施例中，该第二共振频率实质上为该第一频带的中心频率的1.5～2.5倍。In this embodiment, the predetermined distance D must be less than 0.05λ ₁ , where λ ₁ is the wavelength corresponding to the center frequency of the first frequency band (hereinafter referred to as the first resonance frequency). The central frequency of the first frequency band depends on the total length of the first radiator R1, that is, the sum of the lengths of R1 ₁ to R1 ₆ , and the total length of the first radiator R1 is substantially about

Also, the center frequency of the second frequency band (hereinafter referred to as the second resonant frequency, corresponding to the wavelength λ ₂ ) depends on the total length of the first and second radiators, taking Fig. 1a as an example, that is, the first The sum of the lengths of the path conductors R1 ₁ -R1 ₆ and the second path conductor R2 ₁ . In addition, there is a specific multiple relationship between the first resonant frequency and the second resonant frequency, and the multiple depends on the size of the predetermined distance D. Therefore, the designer of the dual-frequency antenna device can control the center frequency of the second frequency band by changing the size of the predetermined distance D and the total length of the second radiator R2. In this embodiment, the second resonance frequency is substantially 1.5˜2.5 times the center frequency of the first frequency band.

2a to 2b show schematic diagrams of two other embodiments of the dual-band antenna device proposed by the present invention. In the dual-frequency antenna device 20 shown in Fig. 2a and Fig. 2b, the first radiator 21 has three first path conductors (21 ₁ ~ 21 ₃ ), forming a single path with two turns t1, t2; The second radiator 22 has a second path conductor 22 ₁ , which is parallel to the first path conductor 21 ₁ ; the first end of the first radiator 2l1 is provided with a signal feeding point F, and the second end is connected to the first path conductor. Two radiators. Likewise, the predetermined distance D between the second path conductor 22 ₁ and the first path conductor 21 ₁ must be smaller than 0.05λ ₁ .

另外，该等双频天线装置的第二共振频率(f₂、f₂′、f₂″)，是随着第二辐射体32与第一辐射体31之间的距离以及第二辐射体32的长度而改变，变化范围在第一共振频率f₁的1.5～2.5倍。又，第二辐射体32中的第二路径导体32₁与第一辐射体31中的第一路径导体31₁两者间的距离必须小于0.05λ₁。3a to 3c show schematic diagrams of another three embodiments of the dual-band antenna device proposed by the present invention. In the figure, the first radiators 31 of the three dual-band antenna devices 30 each have four first path conductors (31 ₁ -31 ₄ ), forming a single path with three turns t1-t3. In FIG. 3a, the second radiator 32 has only one second path conductor 32 ₁ , while in FIGS. 3b and 3c, the second radiator 32 has two second path conductors 32 ₁ and 32 ₂ . In the above three embodiments, the first resonant frequency _f1 of these dual-frequency antenna devices is designed in the GSM 900 frequency band (880-960MHz), so the total length of the first radiator 31 is about 900MHz corresponding to the wavelength (λ ₁ ) of

In addition, the second resonant frequencies (f ₂ , f ₂ ′, f ₂ ″) of these dual-frequency antenna devices vary with the distance between the second radiator 32 and the first radiator 31 and the distance between the second radiator 32 The length is changed, and the variation range is 1.5 to 2.5 times of the first resonant frequency f _1. Also, the second path conductor 32 ₁ in the second radiator 32 and the first path conductor 31 1 in the first radiator ₃₁ are two The distance between them must be less than 0.05λ ₁ .

FIG. 4 shows frequency response diagrams of the dual-band antenna device shown in FIGS. 3a to 3c. The first resonant frequency and the second resonant frequency of the dual-frequency antenna device shown in FIGS. 3a to 3c are (f ₁ , f ₂ ), (f ₁ , f ₂ ′) and (f ₁ , f ₂ ″) respectively. It can be seen from FIG. 4 that the first resonant frequency f ₁ of the dual-band antenna device is hardly affected by the position and length of the second radiator 32 .

In FIGS. 3a to 3c, the distances between the second path conductor 32 ₁ in the second radiator 32 and the first path conductor 31 ₁ in the first radiator 31 are d ₁ , d ₂ and d ₃ , respectively, And d ₁ >d ₂ and d ₂ =d ₃ . It can be seen from FIG. 4 that the second resonant frequency (f ₂ , f ₂ ′, f ₂ ″,) of the dual-frequency antenna device will vary with the position and length of the second radiator 32. For example, when the second path When the distance between the conductor ₃₂₁ and the first path conductor ₃₁₁ is reduced from _d1 to _d2 , the second resonant frequency is also reduced from _f2 to _f2 '. In addition, if the second path conductor ₃₂₁ and the first path conductor are fixed The distance between a path conductor 31 ₁ (d ₂ =d ₃ ), when the length of the second radiator 32 becomes longer (from a single second path conductor 32 ₁ to two second path conductors 32 ₁ , 32 ₂ ), the second resonance frequency is also reduced from f' ₂ to f" ₂ . According to the experimental results, the variation range of the second resonant frequency (f ₂ , f ₂ ′, f ₂ ″) is substantially 1.5 to 2.5 times of the first resonant frequency f _1. This result shows that after properly designing the first resonant frequency And the second radiator will make the dual-band antenna device in the embodiment of the present invention just operate in two frequency bands of GSM 900 and DCS 1800.

FIG. 5 shows a schematic diagram of another embodiment of a dual-band antenna device proposed based on the architecture shown in FIG. 3 a . In the figure, a third path conductor 50 with a different extension direction is further extended at an appropriate position of the first path conductor ₃₁₁ of the first radiator 31, and a distance is maintained between the third path conductor 50 and the first path conductor ₃₁₁ . It is used to generate a third resonant frequency f ₃ ; if the third resonant frequency is designed to be near the second resonant frequency f ₂ , it can be applied in frequency bands such as DCS 1800MHz, PCS 1900MHz or ISM 2400MHz.

In FIG. 6 , the frequency response curves 61 , 62 and 63 respectively show the frequency response results of the dual-band antenna device in FIG. 5 with the length of the third path conductor 50 being 0 mm, 25 mm and 30 mm. From the frequency response curves 61-63, it can be known that the first resonant frequency f ₁ and the second resonant frequency f ₂ resonated by the main body of the dual-band antenna device in this embodiment will not be affected by the length change of the third path conductor 50, but The third resonant frequencies f ₃ and f ₃ ′ decrease as the length of the third path conductor 50 increases.

FIG. 7 shows a schematic diagram of another embodiment of a dual-band antenna device proposed based on the architecture shown in FIG. 3 a . In the figure, a ground conductor 70 with a different extension direction is further extended from a proper position of the first routing conductor 31 ₁ of the first radiator 31 . The terminal G of the ground conductor 70 is connected to a ground plane (for example, arranged on a circuit substrate), which is used for impedance matching of the first or second resonance mode generated by the main body of the dual-frequency antenna device, and can be The matching network (matching network) arranged on the circuit substrate is replaced to achieve the same bandwidth effect.

FIG. 8 shows a schematic diagram of yet another embodiment of a dual-band antenna device combining the features of the embodiments shown in FIGS. 5 and 7 . This embodiment has the effect of enabling the antenna device to operate in multiple frequency bands and achieve broadband.

The dual-band antenna device disclosed in the above embodiments can be applied to wireless communication devices, such as personal mobile communication wireless terminal equipment (GSM, DCS, PCS, WCDMA mobile phones, etc.), and other small wireless communication devices.

FIG. 9 a shows a schematic diagram of an embodiment in which the dual-band antenna device of the foregoing embodiments of the present invention is applied to a wireless communication device. The wireless communication device 9 shown in the figure includes a printed circuit board 90, a radio frequency module 92, which is arranged on the printed circuit board 90, for processing wireless signals; a base frequency module 94, which is arranged on the printed circuit board 90 on, used to process data and related control signals; a power management module 96, arranged on the printed circuit board 90, used to provide management power and provide power to the radio frequency module 92 and the base frequency module 94; and a dual-frequency antenna The device 98 is connected to the radio frequency module 92 through a signal feed point F and the output point A of the circuit board, and is used for receiving or transmitting wireless signals operating in a first frequency band and a second frequency band.

The dual-frequency antenna device 98 used in FIG. 9a is an example of the dual-frequency antenna device shown in FIG. 3a , but is not limited thereto. Any dual-frequency antenna device having the structural features described in Figures 1a, 1b, 2a, 2b, 3a-3c, 5, 7, and 8 can be applied to the wireless communication device shown in Figure 9a, and its structural features are not described here. Let me repeat it. Figure 9b is a schematic diagram showing another embodiment of applying the dual-frequency antenna device 99 shown in Figure 8 to a wireless communication device; wherein, the terminal G of the ground conductor 70 of the dual-frequency antenna device 99 is connected to the printed A ground plane 95 on the circuit substrate 90 .

The dual-frequency antenna device applied in the wireless communication device can be an independent component as shown in FIG. 9a and FIG. 9b ; it can also be directly formed on the surface of the printed circuit board 90 by printing or etching.

Since the design of wireless communication devices tends to be light, thin, short, and small, in order to reduce the appearance of the product and the size of the circuit board, the dual-band antenna device itself also needs to be changed in appearance to match the internal space of the wireless communication device. Its performance is not affected. For example, the first and second radiators in the dual-band antenna device are folded at a specific angle along at least one folding line, so that the dual-band antenna device is divided into two parts along the folding line, and the two parts are located at Different planes form an included angle with the specific angle, so as to change the appearance of the antenna into a three-dimensional structure. For another example, the first and second radiators in the dual-frequency antenna device are folded at two specific angles along two folding lines, so that the dual-frequency antenna device is divided into three parts along the two folding lines. The parts are located on different planes, and the two parts form an included angle with the specified angles. FIG. 10 shows a schematic diagram of a dual-frequency antenna device 100 being folded at about 90 degrees along the folding lines F1 and F2, so that it has a three-dimensional structure and then connected to the printed circuit substrate 101; wherein, the folded lines F1 and F2 The antenna conductor is substantially perpendicular to the printed circuit substrate 101 , and the other antenna conductors are parallel to the printed circuit substrate 101 and extend toward the printed circuit substrate 101 . Although the height of the folded antenna increases slightly in the direction perpendicular to the printed circuit board 101, the area of the antenna in the direction parallel to the printed circuit board 101 is greatly reduced, so it is very suitable for light, thin, short and small wireless communication devices. In the wireless communication device in the embodiment of the present invention, the radio frequency module and the dual-frequency antenna device used belong to components operating in the high-frequency band, and are respectively composed of two independent units. The dual-frequency antenna device and the radio frequency module The connection is achieved by direct contact, welding, or using an adapter. Under high-frequency operation, the parasitic or stray impedance on the circuit will affect the radio frequency module. Therefore, the parasitic or stray impedance at the connection between the antenna and the radio frequency module may affect the performance of the wireless communication device. Therefore, if the dual-frequency antenna device proposed by the embodiment of the present invention and the radio frequency module can be directly integrated into a single chip, the connection point of the antenna and the radio frequency module is formed integrally, which can reduce parasitic or stray impedance and the difference between different chips. Impedance difference.

Another embodiment of the present invention proposes a radio frequency chip, as shown in Figure 11a, including: a substrate 110; a radio frequency circuit unit 111 formed on the substrate for processing wireless signals; and a dual-frequency antenna device 112 , disposed on the substrate, and coupled to the radio frequency circuit unit 111, for receiving or transmitting wireless signals operating in a first frequency band and a second frequency band.

The dual-frequency antenna device 112 used in FIG. 11a is an example of the dual-frequency antenna device shown in FIG. 3a , but is not limited thereto. Any dual-band antenna device having the structural features as shown in Figures 1a, 1b, 2a, 2b, 3a-3c, 5, 7, and 8 can be applied to the radio frequency chip shown in Figure 11a. Here, its structural features will not be described in detail. In the radio frequency chip shown in FIG. 11 a , the dual frequency antenna device 112 and the radio frequency circuit unit 111 are made by semiconductor process technology. However, as shown in FIG. 11b, the radio frequency circuit unit 111 can be formed on the substrate 110 first, and then an isolation layer 113 is formed to cover the radio frequency circuit unit 111; then the dual-frequency antenna device 112 is formed on the surface of the isolation layer 113. , and connected to the RF circuit unit 111 through the through hole 115 .

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention should be defined by the scope of the attached patent application.

Claims (50)

1. A dual-band antenna device for operating in a first frequency band and a second frequency band, characterized in that it comprises: A first radiator is composed of a single path with at least two turns; wherein, the first radiator has a first end and a second end, and the first end is used to feed a signal into the first Radiators; and A second radiator is connected to the second end of the first radiator; wherein, a part of the second radiator is parallel to a part of the first radiator with a predetermined distance. 2. The dual-band antenna device according to claim 1, wherein the predetermined distance is less than 0.05λ, and λ is the wavelength corresponding to the center frequency of the first frequency band. 3. The dual-band antenna device as claimed in claim 1, wherein the center frequency of the first frequency band depends on the total length of the first radiator. 4. The dual-band antenna device as claimed in claim 1, wherein the center frequency of the second frequency band depends on the total length of the first and second radiators. 5. The dual-band antenna device as claimed in claim 1, wherein the center frequency of the second frequency band depends on the predetermined distance. 6. The dual-band antenna device as claimed in claim 1, wherein the center frequency of the second frequency band has a specific multiple relationship with the center frequency of the first frequency band. 7. The dual-band antenna device as claimed in claim 6, wherein the multiplier relationship depends on the size of the predetermined distance. 8. The dual-band antenna device as claimed in claim 6, wherein the center frequency of the second frequency band is substantially 1.5-2.5 times the center frequency of the first frequency band. 9. The dual-band antenna device according to claim 1, wherein the first radiator is composed of a plurality of first path conductors with different extending directions, and the second radiator is composed of at least one second A single path formed by path conductors, wherein a portion of the second path conductor is parallel to a portion of the first path conductor. 10. The dual-band antenna device as claimed in claim 9, wherein the second radiator is a single path formed by connecting a plurality of second path conductors with different extending directions. 11. The dual-band antenna device as claimed in claim 9, wherein the ones of the first path conductors connected to the first end are connected to the second path conductors at the predetermined distance parallel to the second path conductors. the second terminal. 12. The dual-band antenna device as claimed in claim 1, further comprising a substrate for printing or etching the first and second radiators on the surface thereof. 13. The dual-band antenna device as claimed in claim 1, further comprising a third path conductor connected to the first radiator. 14. The dual-band antenna device as claimed in claim 13, wherein the third path conductor extends from and is perpendicular to the one of the first path conductors connected to the first end. 15. The dual-band antenna device as claimed in claim 1, further comprising a ground conductor connected to the first radiator. 16. The dual-band antenna device as claimed in claim 15, wherein the ground conductor is connected to the first end of the first radiator. 17. The dual-band antenna device according to claim 1, wherein the first and second radiators are folded at a specific angle along a folding line, so that the dual-band antenna device is divided into two parts along the folding line. The two parts are located on different planes and form an included angle with the specific angle. 18. The dual-band antenna device according to claim 1, wherein the first and second radiators are folded at two specific angles along two folding lines, so that the dual-band antenna device is folded along the two folding lines The line area is divided into three parts, the three parts are located on different planes, and two parts form an included angle with the specified angles. 19. The dual-band antenna device according to claim 1, wherein the first and second radiators are folded at least at a specific angle along two folding lines, so that the dual-band antenna device is folded along the two folding lines The line area is divided into three parts, two of which are parallel to each other and form an included angle with the other part at that specific angle. 20. A wireless communication device, characterized by comprising: A dual-frequency antenna device for transmitting and receiving a wireless signal operating in a first frequency band and a second frequency band; wherein, the dual-frequency antenna device includes: A first radiator is composed of a single path with at least two turns; wherein, the first radiator has a first end and a second end, and the first end is used to feed the wireless signal into the first radiator; and A second radiator connected to the second end of the first radiator; wherein, part of the second radiator is parallel to part of the first radiator at a predetermined distance; as well as A radio frequency module, coupled to the dual-band antenna device, is used for processing the wireless signal. 21. The wireless communication device according to claim 20, wherein the predetermined distance is less than 0.05λ, and λ is the wavelength corresponding to the central frequency of the first frequency band. 22. The wireless communication device as claimed in claim 20, wherein the center frequency of the first frequency band depends on the total length of the first radiator. 23. The wireless communication device as claimed in claim 20, wherein the center frequency of the second frequency band depends on the total length of the first and second radiators. 24. The wireless communication device as claimed in claim 20, wherein the center frequency of the second frequency band depends on the predetermined distance. 25. The wireless communication device as claimed in claim 20, wherein the center frequency of the second frequency band has a specific multiple relationship with the center frequency of the first frequency band. 26. The wireless communication device as claimed in claim 25, wherein the multiple relationship depends on the size of the predetermined distance. 27. The wireless communication device as claimed in claim 25, wherein the center frequency of the second frequency band is substantially 1.5-2.5 times the center frequency of the first frequency band. 28. The wireless communication device according to claim 20, wherein the first radiator is composed of a plurality of first path conductors with different extending directions, and the second radiator is composed of at least one second path conductor A single path is formed, wherein a portion of the conductor of the second path is parallel to a portion of the conductor of the first path. 29. The wireless communication device as claimed in claim 28, wherein the second radiator is a single path formed by connecting a plurality of second path conductors with different extending directions. 30. The wireless communication device as claimed in claim 28, wherein the ones of the first path conductors connected to the first end are parallel to the second path conductors connected to the second path conductors at the specific distance. the second terminal. 31. The wireless communication device as claimed in claim 20, further comprising a substrate for printing or etching the radio frequency module and the dual-band antenna device on its surface. 32. The wireless communication device as claimed in claim 20, further comprising a third path conductor connected to the first radiator. 33. The wireless communication device as claimed in claim 32, wherein the third path conductor extends from and is perpendicular to the one of the first path conductors connected to the first end. 34. The wireless communication device of claim 20, further comprising a ground conductor connected to the first radiator. 35. The wireless communication device of claim 34, wherein the ground conductor is connected to the first end of the first radiator. 36. The wireless communication device according to claim 20, wherein the first and second radiators are folded at a specific angle along a folding line, so that the dual-band antenna device is divided into two parts along the folding line. The two parts are located in different planes and form an included angle with the specific angle. 37. The wireless communication device according to claim 20, wherein the first and second radiators are folded at two specific angles along two folding lines, so that the dual-band antenna device is folded along the two folding lines The area is divided into three parts, the three parts are located on different planes, and two parts form an included angle with the specified angles. 38. The wireless communication device according to claim 20, wherein the first and second radiators are folded at least at a specific angle along two folding lines, so that the dual-band antenna device is folded along the two folding lines Divide into three parts, two of which are parallel to each other and each form an included angle of that specific angle with the other part. 39. A radio frequency chip, characterized by comprising: a substrate; A dual-frequency antenna device is arranged on the substrate for transmitting and receiving a wireless signal in a first frequency band and a second frequency band; wherein, the dual-frequency antenna device includes: A first radiator is composed of a single path with at least two turns; wherein, the path has a first end and a second end, and the first end is used to feed the wireless signal to the first radiator ;as well as A second radiator connected to the second end; wherein, part of the second radiator is parallel to part of the first radiator at a predetermined distance; as well as A radio frequency circuit unit is arranged on the substrate and coupled to the dual-frequency antenna device for processing the wireless signal. 40. The radio frequency chip according to claim 39, wherein the predetermined distance is less than 0.05λ, and λ is the wavelength corresponding to the center frequency of the first frequency band. 41. The radio frequency chip as claimed in claim 39, wherein the center frequency of the first frequency band depends on the total length of the first radiator. 42. The radio frequency chip as claimed in claim 39, wherein the center frequency of the second frequency band depends on the total length of the first and second radiators. 43. The radio frequency chip as claimed in claim 39, wherein the center frequency of the second frequency band has a specific multiple relationship with the center frequency of the first frequency band. 44. The radio frequency chip as claimed in claim 43, wherein the multiple relationship depends on the size of the predetermined distance. 45. The radio frequency chip of claim 43, wherein the center frequency of the second frequency band is substantially 1.5-2.5 times the center frequency of the first frequency band. 46. The radio frequency chip according to claim 39, wherein the first radiator is composed of a plurality of first path conductors with different extending directions, and the second radiator is composed of at least one second path conductor a single path, wherein a portion of the second path conductor is parallel to a portion of the first path conductor. 47. The radio frequency chip as claimed in claim 39, wherein the first and second radiators are formed on the surface of the substrate using semiconductor process technology. 48. The radio frequency chip as claimed in claim 39, further comprising a third path conductor connected to the first radiator. 49. The radio frequency chip as claimed in claim 39, further comprising a ground conductor connected to the first radiator. 50. The radio frequency chip as claimed in claim 49, wherein the ground conductor is connected to the first end of the first radiator.

Images