CN108539420B - Octal Band Tablet Antenna with Metal Narrow Bezel - Google Patents

Abstract

The invention discloses an eight-band tablet computer antenna with a metal narrow frame, which is used to solve the problem that the tablet computer antenna in the prior art cannot cover eight frequency bands when surrounded by a metal narrow frame. The present invention includes: a dielectric material board 1, a metal floor 2 with a gap, a radiation unit 3 and a metal frame 4; wherein the metal floor 2 with a gap and the radiation unit 3 are printed on the front of the dielectric material board 1, and the The gap is located in the middle of its top edge, the position of the radiation unit 3 corresponds to the position of the gap, the dielectric material board 1 is surrounded by a metal frame 4 with a breakpoint gap 7, and there is a gap 6 between the metal frame 4 and the dielectric material board 1, The metal frame 4 is connected to the metal floor 2 through two short-circuit connectors 8 . The antenna of the invention has a small clearance area, and can completely cover eight working frequency bands, thereby effectively broadening the bandwidth of the antenna, and the measured efficiency of the antenna meets the application requirements of a metal narrow-frame tablet computer.

Description

Octal Band Tablet Antenna with Metal Narrow Bezel

technical field

The invention belongs to the technical field of communication, and further relates to a terminal antenna, in particular to an eight-band tablet computer antenna with a metal narrow frame, which can be used for receiving/transmitting 2G/3G/4G signals on a tablet computer with a metal frame.

Background technique

In recent years, with the rapid development of wireless communication technology, mobile communication terminals have gradually evolved into a bridge between people and the Internet. Among them, the tablet computer has become a necessity of people's daily life. Since the metal frame can not only increase the mechanical stability of the device, but also improve the user's comfort, tablet PCs with metal frames are becoming the mainstream trend in today's market. However, due to the existence of the metal frame, there is bound to be a strong coupling between the traditional mobile terminal antenna and the metal frame, which directly affects the radiation performance of the antenna, making it impossible to completely cover LTE700/2300/2500/GSM850/900/DCS/ Eight working frequency bands of PCS/UMTS2100.

In addition, in order to further increase the high-quality sense of the device, people tend to pursue ultra-thin devices and a larger screen ratio, which will undoubtedly further compress the space occupied by the antenna. Therefore, how to design a low-profile, multi-band, narrow-bezel tablet antenna with metal bezel surrounds is a huge challenge.

At present, in order to solve the problem of deterioration of the terminal antenna performance caused by the metal frame, the more popular design schemes include Loop, Slot, Monopole and so on. For example, in the patent application document with the patent publication number CN 107394351 A and titled "An All-Metal Shell Mobile Smart Terminal Antenna", a terminal antenna is provided, which separates the metal frame by arranging slits on the metal frame. It is divided into two independent parts, and one of the metal frames is used as part of the loop antenna, and finally the seven working frequency bands of GSM850/900/DCS/PCS/UMTS2100/LTE2300/2500 are covered. However, this design requires a large amount of clearance. The requirement of narrow frame cannot be achieved, and the low frequency does not cover the LTE700 frequency band with wide application prospects. In the patent application document with the patent publication number CN 107104284 A and the title of "full metal ring narrow frame 4G smart phone antenna", a full metal ring narrow frame 4G smart phone antenna is provided, wherein the design of the antenna is kept intact Metal frame, but it still fails to cover the LTE700 frequency band, and is loaded with two lumped elements. It is well known that lumped elements will cause unnecessary loss of antenna efficiency. To sum up, the existing technical solutions all have certain defects, and cannot solve the problem of covering eight frequency bands under the circumstance of a metal narrow frame.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an eight-band tablet computer antenna with a metal narrow frame to solve the technical problem of covering eight working frequency bands surrounded by a metal narrow frame, aiming at the above shortcomings of the prior art. The invention integrates the antenna clearance area and the metal frame into a "T"-shaped slot by setting the breakpoint slot and the metal grounding sheet, and uses the antenna radiating element to excite the "T"-shaped slot to generate slot resonance and participate in radiation, thereby effectively widening the antenna. The bandwidth of the antenna unit shares the pressure of the resonance size required by the antenna unit, which greatly reduces the size of the antenna; at the same time, the antenna radiating unit itself can also generate resonance characteristics, and finally achieve an eight-band bandwidth without loading any lumped elements. cover.

To achieve the above object, the technical scheme adopted in the present invention is:

An eight-band tablet computer antenna with a metal narrow frame, comprising a dielectric material board 1, a metal floor 2, a radiation unit 3 and a metal frame 4; wherein a gap 201 is provided in the middle of the top edge of the metal floor 2, and the radiation unit 3 is located in the gap At 201, the metal floor 2 and the radiation unit 3 are printed on the front of the dielectric material board 1, the metal frame 4 surrounds the periphery of the dielectric material board 1, and there is a gap 6 between them, which is characterized by:

A breakpoint gap 7 is provided on the top of the metal frame 4 , and the metal frame 4 is connected to the metal floor 2 through a short-circuit connector 8 .

The above antenna, wherein the breakpoint slot 7 is arranged on the top frame of the metal frame 4, and the left edge of the breakpoint slot 7 is 115-125mm away from the left border of the top frame where it is located; the width of the breakpoint slot 7 is 2～3mm.

The above antenna, wherein the metal frame 4 is directly connected to the metal floor 2 through two short-circuit connectors 8, one of which is arranged on the metal floor 2 close to the left edge of the notch 201, and the other is arranged on the metal floor 2. A position close to the right edge of the notch 201; the short-circuit connector 8 is a metal grounding plate.

In the above antenna, the width of the gap 6 between the dielectric material plate 1 and the metal frame 4 is 1-3 mm.

In the above antenna, the notch 201 is rectangular in shape, and its length is 74 mm and its width is 5 mm.

The above antenna, wherein the radiation unit 3 is composed of an "L" type radiation patch 301, a rectangular radiation patch 302, an "L" type coupling ground patch 303, a feeding point 5 and a ground point 9, wherein the "L" type The short arm of the radiation patch 301 is directly connected to the rectangular radiation patch 302, and the long arm of the "L" type coupling ground patch 303 is partially coupled with the long arm of the "L" type radiation patch 301;

The above-mentioned antenna, wherein the lower edge of the short arm of the "L"-shaped radiation patch 301 is connected to the feeding point 5;

In the above antenna, the lower edge of the short arm of the "L"-shaped coupling ground patch 303 is connected to the metal floor 2 through the ground point 9 .

Compared with the prior art, the present invention has the following advantages:

First: because the invention integrates the antenna clearance area and the metal frame into a "T"-shaped slot by setting the breakpoint slot and the metal grounding sheet, and the "T"-shaped slot is excited by the antenna radiating element to generate slot resonance and participate in the radiation, which is effective. The bandwidth of the antenna is widened, and the pressure of the resonance size required by the antenna unit is shared, thereby greatly reducing the size of the antenna;

Second: the width of the antenna clearance area in the present invention is very small, which meets the design requirements of today's tablet computers, and can completely cover eight operating frequency bands, meeting the application requirements of tablet computer antennas with low profile, multi-band and narrow frame;

Third: since no lumped elements are added in the present invention, unnecessary energy loss caused by loading lumped elements and errors caused by lumped elements during mass production are avoided, and eight lumped elements are not loaded. The frequency band bandwidth coverage and the high measured efficiency make it have significant advantages in practical applications.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the top view structure schematic diagram of the present invention;

Fig. 3 is the S ₁₁ simulation of the present invention and the actual measurement result comparison diagram;

FIG. 4 is a graph of the measured efficiency of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

1, the concrete structure of the present invention is as follows:

An eight-band tablet computer antenna with a metal narrow frame, including a dielectric material plate 1, a metal floor 2, a radiation unit 3 and a metal frame 4; a gap 201 is provided in the middle of the top edge of the metal floor 2, and the radiation unit 3 is located at the gap 201. , the metal floor 2 and the radiation unit 3 are printed on the front surface of the dielectric material board 1 , the metal frame 4 surrounds the periphery of the dielectric material board 1 , and a gap 6 is set between them.

The dielectric material plate 1 is a rectangular dielectric plate with a relative permittivity of 4.4, its length is 150 mm, the width is 200 mm, and the thickness is 0.8 mm.

The metal floor 2 is a metal patch with a gap, which is printed on the front of the rectangular dielectric material board 1. The length of the metal patch is 150mm and the width is 200mm; The gap is 74mm long and 5mm wide, and the left edge of the gap is 63mm apart from the left edge of the metal base plate 2 .

The metal frame 4 surrounds the rectangular dielectric material board 1, and is made of copper sheet with a thickness of 0.5 mm and a height of 5 mm; there is a gap 6 between the metal frame 4 and the rectangular dielectric material board 1, and the width of the gap is 2 mm; the metal frame 4. A breakpoint gap 7 is set at the top edge position, the width of the gap is 2.5mm, and the left edge of the gap is 120.5mm away from the left edge of the top frame of the metal frame 4; the metal frame 4 is directly connected to the metal floor 2 through two short-circuit connectors 8 , the two short-circuit connectors 8 are connected to the metal frame 4 and the metal floor 2 by welding. The short-circuit connector is a metal grounding piece. The function of setting the short-circuit connecting piece is to integrate the metal frame 4 and the metal floor 2 into one. Combined with the gap 6, a "T" type open-circuit slot is formed. The long arm and the short arm of the "T" type open-circuit slot are excited to generate the basic resonance characteristics of 1/4 wavelength, which are used to cover the LTE700 and UMTS2100 frequency bands, effectively widening the antenna. The bandwidth can share the resonance size pressure required by the antenna unit, and realize the miniaturization of the antenna.

Referring to FIG. 2 , the radiation unit 3 of the eight-band tablet computer antenna with narrow metal frame is printed on the front side of the rectangular dielectric material board 1 , and the position corresponds to the position of the metal floor gap, including the “L”-shaped radiation patch 301 , a rectangular radiation patch 302 , an "L"-shaped coupling ground patch 303 , a feed point 5 and a ground point 9 .

The "L"-shaped radiation patch 301 has a longitudinal arm length of 4 mm, a width of 1 mm, a lateral arm length of 49 mm and a width of 0.6 mm, and the upper edge of the longitudinal arm coincides with the upper edge of the dielectric plate 1; The short arm of the radiation patch 301 is directly connected to the rectangular radiation patch 302 .

The rectangular radiation patch 302 has a length of 18 mm and a width of 0.8 mm, and the longitudinal distance between the upper edge of the rectangular radiation patch 302 and the upper edge of the dielectric plate 1 is 2.2 mm.

The "L" type coupling ground patch 303 has a lateral arm length of 34mm and a width of 0.9mm, a longitudinal arm length of 2.8mm and a width of 0.5mm, and the upper edge of the lateral arm is connected to the "L" type radiation patch 301 The longitudinal distance between the lower edges of the lateral arms is 0.7 mm;

The feeding point 5 is located at the lower edge of the short arm of the "L"-shaped radiation patch 301 , and directly feeds the radiation patches 301 and 302 . Among them, the "L"-shaped radiation patch 301 is fed to generate a basic resonance of 1/4 wavelength, covering the DCS/PCS frequency band, and the rectangular radiation patch 302 is fed to generate a basic resonance of 1/4 wavelength, covering the LTE2300/2500 frequency band .

The grounding point 9 is located at the lower edge of the short arm of the "L"-shaped coupling grounding patch 303, and its function is to connect the coupling patch to the metal floor 2 to form a coupled grounding structure to generate resonance for covering the GSM850/900 frequency band.

The application effect of the present invention is further described in conjunction with the following simulation and actual measurement:

1. Simulation and actual measurement conditions:

(1) Use the commercial simulation software HFSS_15.0 and the vector network analyzer _MS46322A to simulate and measure S11 in the above embodiment, and the comparison result between the simulation and the actual measurement is shown in FIG. 3 .

(2) The efficiency in the above embodiment is measured by using a microwave anechoic chamber, and the measured efficiency results in the operating frequency bands (698MHz-960MHz and 1710MHz-2690MHz) are shown in Fig. 4 .

2. Simulation and test results:

3 , taking S ₁₁ ≤-6dB as a standard, the impedance bandwidths of the antenna simulation results in the embodiment are 689MHz-970MHz and 1570MHz-2960MHz, and the impedance bandwidths of the antenna measurement results in the embodiment are 675MHz-1070MHz and 1458MHz-2932MHz.

Referring to FIG. 4 , in the embodiment, the measured efficiency of the antenna is 51%-84% in the low frequency band of 698MHz-960MHz, and is 52%-87% in the high frequency band of 1710MHz-2690MHz.

Based on the above simulation and test results, the present invention can effectively widen the bandwidth of the antenna, and can realize the coverage of the bandwidth of the lower eight frequency bands surrounded by a metal narrow frame without loading any lumped elements.

The parts of the present invention that are not described in detail belong to the common knowledge of those skilled in the art.

The above description and embodiments are only preferred examples of the present invention, and do not constitute any limitation to the present invention. Obviously, for those skilled in the art, after understanding the content and design principles of the present invention, it is possible to use the invention based on the present invention. Under the condition of the principle and structure, various corrections and changes in form and details are made, but these corrections and changes based on the idea of the present invention still fall within the protection scope of the claims of the present invention.

Claims (9)

1. An eight-frequency-band tablet personal computer antenna with a metal narrow frame comprises a dielectric material plate (1), a metal floor (2), a radiation unit (3) and a metal frame (4); wherein the top edge intermediate position on metal floor (2) is equipped with breach (201), and radiant element (3) are located breach (201) department, and metal floor (2) and radiant element (3) are printed in the front of dielectric material board (1), and metal frame (4) encircle in dielectric material board (1) periphery, and are equipped with clearance (6), its characterized in that between the two: the top of the metal frame (4) is provided with a breakpoint gap (7), and the metal frame (4) is connected with the metal floor (2) through a short-circuit connecting piece (8);

the number of the short circuit connecting pieces (8) is two, one of the short circuit connecting pieces is arranged at a position close to the left edge of the notch (201) on the metal floor (2), and the other short circuit connecting piece is arranged at a position close to the right edge of the notch (201) on the metal floor (2);

the break point gap (7) is combined with the gap (6) to form a T-shaped open-circuit gap.

2. The antenna of claim 1, wherein: the breakpoint gap (7) is arranged on the top frame of the metal frame (4), and the left edge of the breakpoint gap (7) is 115-125 mm away from the left boundary of the top frame where the breakpoint gap is located.

3. The antenna of claim 2, wherein: the width of the breakpoint gap (7) is 2-3 mm.

4. The antenna of claim 1, wherein: the short circuit connecting piece (8) is a metal grounding sheet.

5. The antenna of claim 1, wherein: the width of a gap (6) between the dielectric material plate (1) and the metal frame (4) is 1-3 mm.

6. The antenna of claim 1, wherein: the notch (201) is rectangular, and the length and the width of the notch are 74mm and 5mm respectively.

7. The antenna of claim 1, wherein: the radiating unit (3) is composed of an L-shaped radiating patch (301), a rectangular radiating patch (302), an L-shaped coupling grounding patch (303), a feeding point (5) and a grounding point (9), wherein the short arm of the L-shaped radiating patch (301) is directly connected with the rectangular radiating patch (302), and the long arm of the L-shaped coupling grounding patch (303) is partially coupled with the long arm of the L-shaped radiating patch (301).

8. The antenna of claim 7, wherein: the lower edge of the short arm of the L-shaped radiating patch (301) is connected with a feed point (5).

9. The antenna of claim 7, wherein: the lower edge of the short arm of the L-shaped coupling grounding patch (303) is connected with the metal floor (2) through a grounding point (9).

Images