TWI437762B - Mobile communication device antenna - Google Patents

Description

Mobile communication device antenna

The present invention relates to a mobile communication device antenna, and more particularly to a mobile communication device antenna having two broadband operating bands.

With the rapid development of wireless communication technology, the long-term evolution (LTE, Long Term Evolution) mobile communication technology has been promoted, representing that mobile communication device antennas will need to cover a wider bandwidth, such as 698~960MHz and 1710~2690MHz. Covers LTE700/2300/2500 tri-band operation and wireless wide area network (WWAN, Wireless Wide Area Network) five-frequency operation. At this time, it is a big challenge in antenna design to simultaneously consider the LTE/WWAN eight-frequency operation and the reduction of the antenna size. At present, the operating bandwidth of conventional mobile communication device antennas cannot meet the requirements of LTE/WWAN eight-frequency operation at the same time. For example, Taiwan Patent Publication No. I295517 "a built-in multi-frequency antenna" discloses a coupled feed. The multi-band mobile communication device can only cover the GSM900/1800/1900/UMTS quad-band operation and cannot meet the required LTE/WWAN eight-frequency operation.

In order to solve the above problems of the prior art, the present invention proposes a mobile communication device antenna suitable for LTE/WWAN eight-frequency operation, and has a reduced antenna size.

The antenna of the mobile communication device of the present invention comprises: a ground plane having a short circuit point; a dielectric substrate adjacent to the ground plane; a feed portion, the feed portion is located on the dielectric substrate, and the feed portion One end is a feeding point of the antenna; and a radiating portion is at least partially located on the dielectric substrate, and includes: a short-circuiting radiating portion having a length at least twice the length of the feeding portion One end of the short-circuiting radiating portion is connected to the short-circuit point of the grounding surface, and the other end thereof is an open end, and the short-circuiting radiating portion has a plurality of bendings, so that the open end of the short-circuiting radiating portion is disposed close to the short-circuiting radiating portion. An end portion of the short-circuit end extends, the short-circuit radiating portion includes a front end portion of the open end and has a coupling pitch with a portion of the feed portion, through which the short-circuit radiating portion is excited by capacitive coupling of the feed portion; a road radiating portion, one end of the branch radiating portion is electrically connected to the end portion of the short-circuit radiating portion including the short-circuit end, and the other end thereof is an open end, and the branch radiates The portion generates a resonant mode at two specific frequencies to increase the operating bandwidth of the first operating band and the second operating band of the antenna.

The mobile communication device antenna of the present invention can generate two broadband operating bands. Under the definition of 6dB return loss, the first operating band is sufficient to cover LTE700/GSM850/900 (698~960MHz) tri-band operation, and the second operating band is sufficient to cover GSM1800/1900/UMTS/LTE2300/2500 (1710~2690MHz) five-frequency operation. In the present invention, the length of the short-circuiting radiation portion is at least twice the length of the feeding portion, and the short-circuiting radiation portion includes a length of the front end portion of the open end of at least 5 mm, and the front end portion and the feeding portion have a coupling of less than 3 mm. The pitch, so by the coupling pitch, the feed portion can capacitively excite the short-circuited radiation portion. The branch radiating portion is electrically connected to the end portion of the short-circuit radiating portion including the short-circuit end, and the length of the branch radiating portion is adjusted to be about a quarter wavelength of a center frequency of the first operating band, the branch The radiating portion generates a resonant mode at two different specific frequencies, increasing the operating bandwidth of the first operating band and the second operating band of the antenna. The antenna is sufficient to cover the LTE/WWAN eight-frequency operation by the short-circuit radiating portion and the resonant mode generated by the branch radiating portion. Moreover, since the short-circuiting radiation portion has a plurality of bendings, the overall width of the antenna is shortened, and the purpose of reducing the antenna volume can be achieved.

Fig. 1 is a structural view showing a first embodiment of the present invention. The first embodiment 1 includes a ground plane 10, which may be a metal backplane of a notebook computer LCD screen or a system ground plane of a mobile communication device, the ground plane 10 having a short circuit point 101; a medium The substrate 11 is adjacent to the ground plane 10; a feed portion 12 formed on the dielectric substrate 11 by using printing or etching techniques, and the feed portion 12 has a feed point 121, the feed portion 12 is connected to a signal source 17 via the feed point 121; a radiation portion 13 formed on the dielectric substrate 11 by using printing or etching techniques, and comprising: a short-circuit radiation portion 14 and a radiation path Part 15. The short-circuit radiating portion 14 has a length at least twice the length of the feeding portion 12, and one end of the short-circuiting radiating portion 14 is connected to the short-circuit point 101 of the grounding surface 10, and the other end thereof is an open end, and the short-circuiting radiating portion has a plurality of The bending end is such that the open end of the short-circuiting radiation portion extends toward the end portion 143 near the short-circuiting radiation portion including the short-circuiting end, and the short-circuiting radiation portion includes the opening end front end portion 141 and has a coupling pitch with a portion of the feeding portion 17. The coupling pitch 17 is less than 3 mm via the coupling pitch 17, and the short-circuit radiating portion 14 (including the open end front end portion 141, the central portion 142, and the end portion 143 including the short-circuit end) is capacitively coupled by the feed portion 12. One end of the branch radiating portion 15 is electrically connected to the end portion 143 of the short-circuit radiating portion including the short-circuit end, and the other end thereof is an open end, and the branch radiating portion 15 respectively generates a resonance mode at two different specific frequencies, increasing The operating bandwidth of the first operating band 21 and the second operating band 22 of the antenna.

Figure 2 is a graph showing the measured return loss of the first embodiment of the present invention. The experiment was carried out by selecting the following dimensions in the first embodiment: the ground plane 10 has a length of about 260 mm and a width of about 200 mm; and the dielectric substrate 11 has a glass fiber substrate having a length of about 75 mm, a width of about 10 mm, and a thickness of about 0.8 mm. The feed portion 12 has a length of about 30 mm and a width of about 2 mm; the short-circuited radiation portion 14 has a length of about 85 mm and a width of about 1 mm; and the branch radiation portion 15 has a length of about 70 mm and a width of about 1 mm. As shown in FIG. 2, the first embodiment 1 can generate the first operating band 21 and the second operating band 22. Under the definition of 6 dB return loss, the first operating band 21 is sufficient to cover LTE700/GSM850/900 ( 698~960MHz) Tri-band operation, the second operating band 22 is sufficient to cover GSM1800/1900/UMTS/LTE2300/2500 (1710~2690MHz) five-frequency operation.

Fig. 3 is a structural view showing a second embodiment of the present invention, which differs from the first embodiment in that at least a part of the section of the radiating portion 33 is made of a metal sheet by a stamping or cutting technique. The operation principle of the second embodiment 3 is the same as that of the first embodiment 1, and the result similar to that of the first embodiment 1 can be achieved by appropriately adjusting the antenna size, and thus will not be described again.

Fig. 4 is a structural view showing a third embodiment of the present invention, which differs from the first embodiment in that it includes two branch radiating portions 45, 46, that is, at least one branch radiating portion. The operating principle of the third embodiment is the same as that of the first embodiment. The branch radiating portion 45 generates a resonant mode at least at a specific frequency, and increases the operating bandwidth of the antenna. The branch radiating portion 46 can also be at least one. A certain frequency produces a resonance mode, and the antenna operation bandwidth is increased to achieve a result similar to that of the first embodiment 1.

The embodiments described above are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. That is, all changes and modifications made to the scope of the patent application of the present invention should remain within the scope of the present invention.

1. . . First embodiment

3. . . Second embodiment

4. . . Third embodiment

10. . . Ground plane

101. . . Short circuit point

11. . . Dielectric substrate

12. . . Feeding department

121. . . Feeding point

13,33,43. . . Radiation department

14,34,44. . . Short circuit radiation

141,341,441. . . The short-circuit radiating portion includes an open end end section

142,342,442. . . Central section of short-circuit radiation

143,343,443. . . The short-circuit radiating portion includes the end portion of the short-circuit end

15,35,45,46. . . Branch radiation department

16,36. . . Coupling pitch

17. . . signal source

twenty one. . . First operating band

twenty two. . . Second operating band

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

Figure 2 is a graph showing the measured return loss of the first embodiment of the present invention.

Fig. 3 is a structural view showing a second embodiment of the present invention.

Fig. 4 is a structural view showing a third embodiment of the present invention.

1‧‧‧First embodiment

10‧‧‧ Ground plane

101‧‧‧ Short circuit point

11‧‧‧Media substrate

12‧‧‧Feeding Department

121‧‧‧Feeding point

13‧‧‧ Radiation Department

14‧‧‧ Short-circuit radiation department

141‧‧‧ Short-circuit radiation section including the front end of the open end

142‧‧‧Central section of short-circuit radiation

143‧‧‧The short-circuit radiating part contains the end section of the short-circuit end

15‧‧ ‧ branch road radiation department

16‧‧‧Coupling spacing

17‧‧‧Signal source

Claims (10)

An antenna of a mobile communication device includes: a ground plane having a short circuit point; a dielectric substrate adjacent to the ground plane; a feed portion, the feed portion is located on the dielectric substrate, and one end of the feed portion a feeding point of the antenna; and a radiating portion, the radiating portion is at least partially located on the dielectric substrate, and the radiating portion comprises: a short-circuiting radiating portion, wherein the short-circuiting radiating portion has a length of at least 2 of the length of the feeding portion The one end of the short-circuiting radiating portion is connected to the short-circuit point of the grounding surface, and the other end thereof is an open end, and the short-circuiting radiating portion has a plurality of bendings so that the open end of the short-circuiting radiating portion faces the short-circuiting radiating portion An end portion extending including the short-circuit end, the short-circuit radiating portion includes a front end portion of the open end and a coupling interval with a portion of the feeding portion, and the short-circuit radiating portion is excited by the feeding portion by capacitive coupling; and a branch radiating portion, one end of the branch radiating portion is electrically connected to the end portion of the short-circuit radiating portion including the short-circuit end, and the other end is an open end, the branch The radiating portion generates a resonant mode at two different specific frequencies, increasing the operating bandwidth of the first operating band and the second operating band of the antenna. The mobile communication device antenna according to claim 1, wherein the coupling pitch is less than 3 mm. The mobile communication device antenna according to claim 1, wherein the short-circuit radiating portion includes a length of at least 5 mm in a front end portion of the open end. The mobile communication device antenna according to claim 1, wherein the ground plane is a metal back plate of a notebook computer LCD screen. The mobile communication device antenna according to claim 1, wherein the ground plane is a system ground plane of a mobile communication device. The mobile communication device antenna according to claim 1, wherein the feeding portion is formed on the dielectric substrate by a printing or etching technique. The mobile communication device antenna of claim 1, wherein the radiation portion is formed on the dielectric substrate by a printing or etching technique. The mobile communication device antenna according to claim 1, wherein at least part of the radiation portion is made of a metal sheet by stamping or cutting technology. The mobile communication device antenna according to claim 1, wherein the first operating band covers 698 to 960 MHz, and the second operating band covers 1710 to 2690 MHz. An antenna of a mobile communication device includes: a ground plane having a short circuit point; a dielectric substrate adjacent to the ground plane; a feed portion, the feed portion is located on the dielectric substrate, and one end of the feed portion a feeding point of the antenna; and a radiating portion, the radiating portion is at least partially located on the dielectric substrate, and the radiating portion comprises: a short-circuiting radiating portion, wherein the short-circuiting radiating portion has a length of at least 2 of the length of the feeding portion The one end of the short-circuiting radiating portion is connected to the short-circuit point of the grounding surface, and the other end thereof is an open end, and the short-circuiting radiating portion has a plurality of bendings so that the open end of the short-circuiting radiating portion faces the short-circuiting radiating portion An end section including a short-circuit end, the short-circuit radiating portion includes a front end section of the open end and has a coupling pitch with a partial section of the feeding portion, and the short-circuit radiating portion is excited by the feeding portion by capacitive coupling; and at least a road radiation portion, one end of the branch radiation portion is electrically connected to the end portion of the short-circuit radiation portion including the short-circuit end, and the other end is an open end, The branch radiating portion generates a resonant mode at least at a specific frequency, increasing the operating bandwidth of the antenna.