TW201322548A - Communication device and internal antenna therein formed by monopole element and its clearance region as open-slot radiator - Google Patents

Abstract

The present invention is related to a communication device which comprises a ground element, a grounded metal portion, and an antenna element. The ground element is disposed on a dielectric substrate. At a corner of the ground element, there is a notch. The notch has a longer edge and a shorter edge, and there is a metal pad at the shorter edge of the notch. The metal pad is not connected to the ground element. The grounded metal portion extends substantially along the longer edge of the notch, with one end of the grounded metal portion coupled to the ground element and the other end of the grounded metal portion coupled to the metal pad in the notch. With the presence of the grounded metal portion, the notch is formed as an open-slot region. The antenna element comprises a first radiating portion and a second radiating portion. The first radiating portion is disposed in the notch and generates at least a resonant mode to operate in a first operating band (upper band) of the antenna element. The second radiating portion is an open-slot radiator formed in the open-slot region and generates a resonant mode to operate in a second operating band (lower band) of the antenna element.

Description

Communication device and its combined monopole element and its built-in antenna with a clear space for the open slot radiating element

The present invention is a communication device, and more particularly a communication device having a built-in antenna incorporating a monopole element and a clear slotted radiating element.

Mobile technology continues to innovate, not only requires the appearance of light, thin, short, small, in the application of communication technology with faster transmission speed, more operating bandwidth requirements also follow. In order to obtain wide-band operation, the general antenna component needs to occupy a clearance space on the system board of the communication device, which limits the effective use of the entire system board space, and can not actually achieve the reduction of the antenna component. For example, U.S. Patent No. 7,978,141 B2, "Coupled-fed Multi-band Loop Antenna", is an example of an antenna design in which the antenna element is in a clear space and fails to form a radiating element. The resonant mode allows the antenna element to cover more operating bands.

In order to solve the above problems of the prior art, the present invention provides a communication device having a built-in antenna incorporating a monopole element and an open slot radiating element. In the present invention, the clearing interval of the antenna element can form another radiating element to generate a resonant mode, so that the antenna element can cover more operating frequency bands, and the clearing interval on the system circuit board can be effectively utilized.

The communication device of the present invention includes a grounding element, a grounded metal portion, and an antenna element. The grounding component is located on a surface of the dielectric substrate, and a corner of the grounding component has a notch. The notch has a long side and a short side, and has a metal piece at the short side, and the metal piece is separated from the grounding element. The grounded metal portion extends substantially along the long side of the notch, one end of which is electrically coupled to the grounding member, the other end of which is electrically coupled to the metal sheet in the notch, and the grounded metal portion such that the notch forms an open slot section. The antenna element includes a first radiating portion and a second radiating portion; the first radiating portion is located in the notch, and generates at least one resonant mode in a first (high frequency) operating frequency band of the antenna element; the second radiating portion is an open slot The aperture antenna is formed by an open slot section that produces a resonant mode located in a second (low frequency) operating band of the antenna element.

In the communication device of the present invention, the first radiating portion is a monopole antenna, and the feeding point thereof is a feeding point of the antenna element, and at the same time, it can serve as a feeding portion of the second radiating portion to excite the open slot antenna, and The grounding metal portion and the dielectric substrate are located on different planes, and the height of the grounded metal portion on the dielectric substrate is less than 5 mm, so that the communication device of the present invention can be applied to the thin mobile communication device, and the first antenna element is And the second operating band covers at least one mobile communication band.

1 is a structural view of a first embodiment of the present invention, including a grounding member 11, a dielectric substrate 12, a notch 13, a long side 131 of a notch, a short side 132 of a notch, a feeding point 14, a first radiating portion 15, The second radiating portion 16, the metal piece 17, the grounding metal portion 18, the first end 181 of the grounding metal portion, the second end 182 of the grounding metal portion, and the antenna element 10. The grounding element 11 is located on the dielectric substrate 12. The grounding element 11 has a notch 13 at a corner thereof. The notch 13 has a long side 131 and a short side 132. The short side 132 has a metal piece 17, a metal piece 17 and a ground. Element 11 is separated. The grounding metal portion 18 extends substantially along the long side 131 of the notch 13, one end 181 of which is electrically coupled to the grounding member 11, and the other end 182 of which is electrically coupled to the metal sheet 17 in the notch 13, the grounding metal portion 18 forming the notch 13 Open slot section. The antenna element 10 includes: a first radiating portion 15 in which the first radiating portion 15 is located, which generates at least one resonant mode in a first (high frequency) operating band of the antenna element 10; and a second radiating portion 16, The second radiating portion 16 is an open slot antenna formed by the open slot portion, and the first radiating portion 15 serves as a feeding portion to excite the open slot to generate a resonant mode at the antenna element 10. Two (low frequency) operating bands.

Fig. 2 is a structural view showing a second embodiment of the present invention. The main difference between the second embodiment and the first embodiment is that the first radiating portion 25 is a two-branch monopole antenna that can generate at least two resonant modes in the first (high frequency) operating band of the antenna element 20. The other antenna structure of the second embodiment is similar to that of the first embodiment, and in this similar configuration, the second embodiment can also have similar effects as the first embodiment.

Figure 3 is a graph showing the measured return loss of the second embodiment of the present invention. In the second embodiment, the following dimensions are selected for implementation: the dielectric substrate 12 has a length of about 109 mm, a width of about 60 mm, and a thickness of about 0.8 mm; the grounding member 11 is on the dielectric substrate 12, and the grounding member 11 is notched. The length of 13 is about 45 mm and the width is about 9 mm. The length of the open slot formed by the grounded metal portion 18 and the notch 13 is about the center frequency of the second (low frequency) operating band 32 (about 900 MHz). 0.14 times the wavelength, the length of the open slot section is less than a quarter wavelength of the center frequency, because the open slot antenna portion is printed on the dielectric substrate 12; the first radiating portion located in the notch 13 The length of the 25th branch is approximately 38 mm and 30 mm, respectively. Since the first radiating portion 15 only needs to provide the resonant mode in the high frequency operating band, the required size can be greatly reduced. The grounded metal portion 18 has a height of about 4 mm and a length of about 45 mm. From the measurement results, the second embodiment of the present invention is defined by the 6 dB return loss (the antenna design specification of the mobile communication device), and the first operating band 31 can cover at least the tri-band operation of the GSM1800/1900/UMTS (1710~). 2170 MHz), the second operating frequency 32 can cover at least the GSM850/900 dual-frequency operation (824~960 MHz), so the antenna can meet at least the WWAN five-frequency operation requirements. In the second embodiment, the overall antenna element occupies only 9 x 45 mm ² of the system board of the dielectric substrate or the communication device, and has a low-profile and easy-to-manufacture characteristic, and is particularly suitable for use in a thin mobile communication device.

Fig. 4 is a graph showing the simulated return loss when there is no grounded metal portion in the second embodiment of the present invention. From the simulation results, the operating band 41 can only cover the tri-band operation requirements of the GSM1800/1900/UMTS in the high-frequency band. Compared with the second embodiment of the present invention, when the grounded metal portion 18 is not provided, the notch 13 cannot be formed. An open slot section, and thus unable to generate a resonant mode in the low frequency band, cannot meet the operational requirements of the WWAN five-frequency.

Fig. 5 is a structural view showing a third embodiment of the present invention. The main difference between the third embodiment and the first embodiment is that the notch 53 can have at least two corners without having to have only a right angle. The other antenna structure of the third embodiment is similar to that of the first embodiment, and in this similar configuration, the third embodiment can also have similar effects as the first embodiment.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the equivalent changes and modifications made by the invention in accordance with the scope of the invention are still within the scope of the invention.

10,20,30. . . Antenna component

11,51. . . Grounding element

12. . . Dielectric substrate

13,53. . . gap

131,531. . . Long side of the gap

132,532. . . Short side of the gap

14,24. . . Feeding point

15,25. . . First radiation department

16,56. . . Second radiation department

17. . . Metal sheets

18. . . Grounded metal part

181. . . First end of the grounded metal portion

182. . . Second end of the grounded metal portion

31. . . First (high frequency) operating band

32. . . Second (low frequency) operating band

41. . . Operating band of the second embodiment without a grounded metal portion

Fig. 1 is a structural view showing a first embodiment of the present invention.

Fig. 2 is a structural view showing a second embodiment of the present invention.

Figure 3 is a graph of the simulated return loss of the second embodiment of the present invention.

Fig. 4 is a graph showing the simulated return loss when there is no grounded metal portion in the second embodiment of the present invention.

Fig. 5 is a structural view showing a third embodiment of the present invention.

10. . . Antenna component

11. . . Grounding element

12. . . Dielectric substrate

13. . . gap

131. . . Long side of the gap

132. . . Short side of the gap

14. . . Feeding point

15. . . First radiation department

16. . . Second radiation department

17. . . Metal sheets

18. . . Grounded metal part

181. . . First end of the grounded metal portion

182. . . Second end of the grounded metal portion

Claims (6)

A communication device includes: a grounding component on a dielectric substrate, the grounding component having a notch at a corner thereof, the notch having a long side and a short side, and a metal piece at the short side Separating the metal piece from the grounding member; a grounding metal portion extending substantially along the long side of the notch, one end of which is electrically coupled to the grounding member, and the other end of which is electrically coupled to the notch a metal piece, the grounding metal portion forming the notch to form an open slot section; and an antenna element, the antenna element comprising: a first radiating portion, the first radiating portion is located in the notch, and generates at least one resonant mode Located in a first (high frequency) operating frequency band of the antenna element; and a second radiating portion, the second radiating portion is an open slot antenna formed by the open slot interval, which generates a resonant mode Located within one of the second (low frequency) operating bands of the antenna element. The communication device of claim 1, wherein the first radiating portion is a monopole antenna. The communication device of claim 1, wherein the feeding point of the first radiating portion is a feeding point of the antenna element. The communication device of claim 1, wherein the first and second operating bands of the antenna element cover at least one mobile communication band. The communication device of claim 1, wherein the grounded metal portion and the dielectric substrate are on different planes. The communication device of claim 1, wherein the grounded metal portion is located on the dielectric substrate at a height of less than 5 mm.