TWI469438B - Communication electronic device and planar broadband antenna element therein - Google Patents

Description

Communication electronic device and planar broadband antenna element thereof

The present invention relates to a communication electronic device, and more particularly to a tablet device having a planar wideband antenna element.

With the rapid development of wireless communication technology, people's demand for wireless communication technology is also deepening, and related electronic products have gradually become the mainstream in the market. For example, a tablet with a size between a mobile phone and a notebook computer, in addition to supporting wireless local area network (WLAN) operation, needs to increase the mobility of the electronic device by operating a wireless wide area network (WWAN). In addition, the appearance of mobile communication devices is targeted at thinning, in order to obtain the favor of consumers. Therefore, how to design a built-in planar printed antenna design suitable for thinned mobile communication devices and having a wide frequency operating band to cover WWAN multi-frequency operation has become an important issue.

Therefore, it is necessary to provide a communication electronic device (for example, a tablet device) having two broadband operating bands, covering at least the 824-960 MHz and 1710-2170 MHz bands, and the antenna elements have a planar design and a small size. Features.

It is an object of the present invention to provide a communication electronic device having a built-in antenna element having an antenna ground plane, which can increase the flexibility of the antenna design, and has the advantages of small size, planar printing, and wide frequency operation.

To achieve the above object, a communication electronic device of the present invention comprises a grounding component and an antenna component on the dielectric substrate, the antenna component comprising a radiating portion and an antenna grounding surface, the antenna grounding surface and electrically connected to the grounding component And the slot on the antenna has a slot, the slot can generate an anti-resonance mode near the center frequency of the operating band of the antenna element, thereby adjusting the impedance matching in the operating band to increase the operating bandwidth; the radiating portion includes a a first metal portion and a second metal portion, wherein one end of the second metal portion is electrically coupled to the antenna ground plane, and the second metal portion has a length at least twice the length of the first metal portion, and the second metal portion surrounds The first metal portion extends. The first metal portion and the second metal portion are combined with the slot on the ground plane of the antenna to enable the antenna element to have two broadband operating bands, including a first operating band and a second operating band, both of which cover the first and second operating bands. At least one mobile communication band.

In an embodiment of the invention, the antenna element has an antenna ground plane, and the antenna ground plane has a slot, which can generate an anti-resonance mode near the center frequency of the operating band of the antenna element, thereby helping to improve the antenna component. The impedance is matched to increase the operating bandwidth of the antenna element. In addition, the antenna body has a first metal portion and a second metal portion. The first metal portion can generate a resonant mode at a high frequency, and the second metal portion can generate a resonant mode at a low frequency and is generated by the slot. The anti-resonance modes are adjacent. Antenna bandwidth The increase is mainly due to the anti-resonance mode of the slot itself, which can generate an additional imaginary impedance zero point near the resonant mode of the antenna low frequency, thereby adding a resonant mode and combining with the original resonant mode. Increase the operating bandwidth of the antenna, especially the operating bandwidth of the antenna's low frequency band.

In an embodiment of the invention, the size of the antenna is only about 12 x 35 mm ² , which can cover the operation of the WWAN five-band (824~960/1710~2170 MHz), achieving the advantages of small size, flat printing and wide frequency operation.

The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims.

Please refer to FIG. 1. FIG. 1 is a structural diagram of a first embodiment of a communication electronic device 1 and an antenna element 11 thereof according to the present invention. In this embodiment, the communication electronic device 1 includes a grounding component 10, a grounding point 101, and an antenna component 11 on a dielectric substrate 12. The antenna element 11 includes an antenna ground plane 13 and a radiating portion. The antenna ground plane 13 has a spiral slot 16 having a first end (open end) 161 at one edge 131 of the antenna ground plane and a second end (closed end) 162 at the antenna ground plane 13 internal. The radiating portion has a first metal portion 14 and a second metal portion 15, wherein one end of the second metal portion 15 is electrically coupled to the antenna ground plane 13 and the second metal portion 15 extends around the first metal portion 14.

Please refer to FIG. 2 together. FIG. 2 is a view showing the first embodiment of the communication electronic device 1 and the antenna element 11 of the present invention without a slot. Simulate the return loss comparison graph. The first embodiment selects the grounding element 10 to have a length of about 150 mm and a width of about 200 mm; the dielectric substrate 12 has a length of about 35 mm, a width of about 12 mm, and a thickness of about 0.8 mm. The first metal portion 14 has a length of about 29 mm, and the second metal portion 15 has a length of about 70 mm, which is greater than twice the length of the first metal portion 14. In the first embodiment, when the slot 16 is not provided, the second metal portion 15 can excite a first resonant mode 24, and the first metal portion 14 can excite a second resonant mode 25, but at this time, the first resonant mode 24 It does not cover the required operating bandwidth. The second metal portion 15 of the first embodiment can excite a first resonant mode 21, and the first metal portion 14 can excite a third resonant mode 23, wherein the slot 16 can be at the center of the operating band of the antenna element 11. An anti-resonance mode is generated near the frequency, and an imaginary impedance zero is additionally generated to generate a second resonant mode 22, and is combined with the first resonant mode 21 generated by the second metal portion 15 to synthesize the first embodiment. The first operational frequency band and the third resonant mode 23 are the second operational frequency band of the first embodiment. Under the definition of 6dB return loss (general mobile communication antenna design specification), the first operating band of the first embodiment may cover two-frequency operation of GSM850/900 (about 824-960 MHz); the second operating band of the first embodiment The GSM1800/1900/UMTS (about 1710~2170MHz) tri-band operation can be covered. Therefore, the first operating band and the second operating band of the communication electronic device and the antenna component thereof can cover at least one mobile communication band, and can Meet the operational needs of WWAN five-frequency.

Please refer to FIG. 3. FIG. 3 is a comparison diagram of the analog input impedance of the first embodiment of the communication electronic device 1 and its antenna element 11 of the present invention without the slot in the first embodiment. The input impedance real part curve 33, the imaginary part curve 34, and the input impedance real part curve of the first embodiment are compared with the first embodiment without the slot. 31. The imaginary part curve 32, it can be found that the input impedance real part curve 31 and the imaginary part curve 32 of the first embodiment generate an anti-resonance mode 35 near the center frequency of the operating band of the antenna element 11, and additionally generate an imaginary part impedance. Zero, increase the operating bandwidth.

Please refer to FIG. 4, which is a structural diagram of a second embodiment of the communication electronic device 4 and its antenna element 41 of the present invention. The structure of the communication electronic device 4 of the second embodiment is basically the same as that of the communication electronic device 1 of the first embodiment, except that the slot 46 has a shape of a shape, and has a first end (open end) 461 at the antenna connection. One of the ground edges 131 and a second end (closed end) 462 are located inside the antenna ground plane. Thus, the third embodiment can also achieve similar effects as the first embodiment.

Please refer to FIG. 5. FIG. 5 is a structural diagram of a third embodiment of the communication electronic device 5 and its antenna element 51 of the present invention. The structure of the communication electronic device 5 of the third embodiment is basically the same as that of the communication electronic device 1 of the first embodiment, except that the antenna ground plane 53, the slot 56 and the second metal portion 55 are located on the other surface of the dielectric substrate 12. And on the different surface of the dielectric substrate 12 with the first metal portion 14. The slot 56 has a first end (open end) 561 located at an edge 131 of the antenna ground plane and a second end (closed end) 562 located inside the antenna ground plane, and a coaxial transmission line 57 is used as the signal feed. Use. Thus, the third embodiment can also achieve similar effects as the first embodiment.

The present invention is intended to be different from the prior art, and the various embodiments described above are merely for convenience of description, and the scope of the claims claimed by the present invention is intended to be a patent application. The above is the subject matter, and is not limited to the above embodiments.

1‧‧‧ First embodiment of the communication electronic device of the present invention

4‧‧‧Second embodiment of the communication electronic device of the present invention

5‧‧‧ Third embodiment of the communication electronic device of the present invention

10‧‧‧ Grounding components

101‧‧‧ Grounding point

11,41,51‧‧‧Antenna components

12‧‧‧Media substrate

13,53‧‧‧Antenna ground plane

131‧‧‧One edge of the antenna ground plane

14‧‧‧First Metals Department

15,55‧‧‧The Second Metals Department

16,46,56‧‧‧Slots

161,461,561‧‧‧ the first end of the slot (open end)

162,462,562‧‧‧Second end of the slot (closed end)

21‧‧‧First Resonance Mode of the First Embodiment

22‧‧‧ Second Resonance Mode of the First Embodiment

23‧‧‧ Third Resonance Mode of the First Embodiment

24‧‧‧First embodiment of the first resonant mode without slotting

25‧‧‧The second resonance mode of the first embodiment without slot

31‧‧‧The actual impedance curve of the input impedance of the first embodiment

32‧‧‧The imaginary part of the input impedance of the first embodiment

33‧‧‧The first embodiment of the input impedance real curve without slot

34‧‧‧The imaginary part of the input impedance when there is no slot in the first embodiment

35‧‧‧Antiresonance mode

57‧‧‧ coaxial transmission line

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

Fig. 2 is a comparison diagram of the simulated return loss when the first embodiment of the communication electronic device of the present invention and the first embodiment have no slot.

Figure 3 is a comparison diagram of the analog input impedance of the first embodiment of the communication electronic device of the present invention and the first embodiment without slotting.

Figure 4 is a block diagram showing a second embodiment of the communication electronic device of the present invention.

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

1‧‧‧ First embodiment of the communication electronic device of the present invention

4‧‧‧Second embodiment of the communication electronic device of the present invention

5‧‧‧ Third embodiment of the communication electronic device of the present invention

10‧‧‧ Grounding components

101‧‧‧ Grounding point

11‧‧‧Antenna components

12‧‧‧Media substrate

13‧‧‧Antenna ground plane

131‧‧‧One edge of the antenna ground plane

14‧‧‧First Metals Department

15‧‧‧Second Metals Department

16‧‧‧Slots

161‧‧‧The first end of the slot (open end)

162‧‧‧Second end of the slot (closed end)

Claims (5)

A communication electronic device comprising: a grounding component; an antenna component on a dielectric substrate, and comprising: a radiating portion; and an antenna grounding surface, the antenna grounding surface is electrically connected to the grounding component, the antenna The grounding surface has a slot, the slot is a spiral or a serpentine slot, and the first end is an open end, located at one edge of the grounding surface of the antenna, and the second end is a closed end, and the antenna is located at the antenna Inside the ground plane, the slot is used to increase the operating bandwidth of the antenna element. The communication electronic device of claim 1, wherein the radiation portion comprises: a first metal portion; and a second metal portion, one end of which is electrically coupled to the antenna ground plane, and the second metal portion has a length of at least It is twice the length of the first metal portion and extends around the first metal portion. The communication device of claim 1, wherein the antenna element has a first operating band and a second operating band, and the first and second operating bands each cover at least one mobile communication band. The communication electronic device of claim 1, wherein the antenna ground plane and the radiation portion are located on the same surface of the dielectric substrate. The communication electronic device of claim 1, wherein the antenna ground plane and a portion of the radiation portion are different in the dielectric substrate. On the surface.