CN106299613B - Antenna system - Google Patents

Abstract

An antenna system. The antenna system includes: a first dipole antenna component and a second dipole antenna component; the first dipole antenna component includes a first feed radiating portion and a first ground radiating portion, wherein the first feed radiating portion has a protruding portion, the first ground radiating portion has an opening slot, and the protruding portion extends into the opening slot; the second dipole antenna component includes a second feed radiating portion and a second ground radiating portion; wherein the first dipole antenna component and the second dipole antenna component are both excited by a signal source. The first dipole antenna component operates in a low frequency band, and the second dipole antenna component operates in a high frequency band. The antenna system of the present invention has the characteristics of high gain, low insertion loss, less inter-band interference and low coaxial cable radiation, and has a simple structure. It is easy to implement and operate in various communication devices and can enjoy the commercial value of mass production.

Description

Antenna system

technical field

The present invention relates to an antenna system, in particular to a high gain (High Gain) antenna system.

Background technique

With the development of mobile communication technology, mobile devices have become more and more common in recent years, such as portable computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-distance wireless communication range, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and their use of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz frequency bands for communication, While some cover short-range wireless communication range, for example: Wi-Fi, Bluetooth systems use the 2.4GHz, 5.2GHz and 5.8GHz frequency bands to communicate.

Antenna is an indispensable component in the field of wireless communication. If the gain of the antenna used for receiving or transmitting signals is insufficient, the communication quality of the mobile device is easily degraded. Therefore, how to design high-gain antenna components is an important issue for antenna designers.

Therefore, there is a need to provide an antenna system to solve the above problems.

SUMMARY OF THE INVENTION

The invention provides an antenna system, the antenna system includes: a first dipole antenna assembly, the first dipole antenna assembly includes a first feeding radiating part and a first ground radiating part, wherein the first feeding The radiating part has a protruding part, the first grounding radiating part has an opening slot, and the protruding part extends into the opening slot; and a second dipole antenna assembly, the second dipole antenna assembly includes a a second feeding radiating part and a second grounding radiating part; wherein the first dipole antenna element and the second dipole antenna element are both excited by a signal source, and the first dipole antenna element operates in a low frequency band , and the second dipole antenna element operates in a high frequency band.

In some embodiments, the first feeding and radiating portion, the first grounding radiating portion, the second feeding and radiating portion, and the second grounding radiating portion are each substantially rectangular.

In some embodiments, the protruding portion is generally in the shape of a narrower straight bar, and the opening slot is generally in the shape of a wider straight bar.

In some embodiments, the length of the open slot is less than one-eighth wavelength of a central operating frequency of the low frequency band.

In some embodiments, the gap between the protruding portion and the edge of the open slot is less than 1 mm.

In some embodiments, the protruding portion and the open slot are used to prevent the high frequency band current from interfering with the first dipole antenna assembly.

In some embodiments, a first feeding point of the first feeding and radiating part and a second feeding point of the second feeding radiating part are both coupled to the positive electrode of the signal source, and the first grounding A first ground point of the radiation portion and a second ground point of the second ground radiation portion are both coupled to the negative electrode of the signal source.

In some embodiments, the first feed point is adjacent to the protruding portion, and the first ground point is adjacent to the open slot.

In some embodiments, the antenna system further includes: a first serpentine connecting line; and a first series-connected radiating portion coupled to the first feeding radiating portion via the first serpentine connecting line.

In some embodiments, the protruding portion is located at a first edge of the first feeding and radiating portion, the first serpentine connecting line is coupled to a second edge of the first feeding and radiating portion, and the first The edge is relative to the second edge.

In some embodiments, the first serpentine connection line is substantially a combination of one or more W-shapes.

In some embodiments, the first serially connected radiation portion is substantially rectangular.

In some embodiments, the length of the first serpentine connection line is approximately equal to one-half wavelength of a central operating frequency of the low frequency band.

In some embodiments, the length of the first serial radiating portion is approximately equal to one-half wavelength of a central operating frequency of the low frequency band.

In some embodiments, the antenna system further includes: a coaxial cable including a center conductor and a conductor shell, wherein the positive electrode of the signal source is coupled to the first feed point and the first feed point via the center conductor Two feeding points, and the negative electrode of the signal source is coupled to the first ground point and the second ground point through the conductor shell.

In some embodiments, the antenna system further includes: a backflow suppression component coupled to the conductor housing, wherein the backflow suppression component is used to attract current in the conductor housing to prevent radiation from the coaxial cable.

In some embodiments, the backflow suppression component is substantially L-shaped.

In some embodiments, the length of the backflow suppression element is approximately equal to one quarter wavelength of a center operating frequency of the low frequency band.

In some embodiments, the gap between the backflow suppression assembly and the first dipole antenna assembly is between about 2 mm and 3 mm.

In some embodiments, the antenna system further includes: a second serpentine connection line; a second series-connected radiating portion, coupled to the second feed-in radiating portion via the second serpentine connection line; a third a serpentine connection line; and a third serially connected radiating portion, coupled to the second ground radiating portion through the third serpentine connection line.

The present invention provides an antenna system which can have the characteristics of high gain, low insertion loss, less inter-band interference, and low coaxial cable line radiation. The present invention has a simple structure, is easy to implement and operate in various communication devices, and can enjoy the commercial value of mass production.

Description of drawings

FIG. 1 shows a schematic diagram of an antenna system according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of an antenna system according to an embodiment of the present invention;

FIG. 3 shows a schematic diagram of an antenna system according to an embodiment of the present invention; and

FIG. 4 shows a schematic diagram of an antenna system according to an embodiment of the present invention.

Explanation of main component symbols:

100, 200, 300, 400 Antenna Systems

110 First dipole antenna assembly

111 First feed point

112 First ground point

120 The first feeding and radiating part

121 The first edge of the first feeding and radiating part

122 The first edge of the first feeding and radiating part

125 The protruding part of the first feeding and radiating part

130 First ground radiation part

135 The opening slot of the first ground radiating part

140 Second Dipole Antenna Assembly

141 Second feed point

142 Second ground point

150 The second feeding and radiating part

160 Second ground radiation part

190 sources

271 First meandering connection line

272 The first serial radiation part

273 Fourth meandering connection line

274 Fourth serial radiation part

350 coaxial cable

Center conductor of 351 coaxial cable

352 Coaxial Cable Conductor Housing

360 Backflow Suppression Assembly

471 Second meandering connection line

472 The second radiating part in series

473 Third meandering connection line

474 The third radiating part in series

Ll Length of open slot

G1 Gap between the edge of the slotted hole and the protruding part

G2 Backflow Suppression Assembly and First Dipole Antenna Assembly Clearance

Detailed ways

In order to make the objects, features and advantages of the present invention more clearly understood, the following specific embodiments of the present invention are given and described in detail in conjunction with the accompanying drawings.

FIG. 1 shows a schematic diagram of an antenna system 100 according to an embodiment of the present invention. The antenna system 100 can be made of metal material, and can be disposed on a dielectric substrate, such as a printed circuit board (Printed Circuit Board, PCB), or a FR4 (Flame Retardant 4) board. As shown in FIG. 1 , the antenna system 100 at least includes a first dipole antenna assembly 110 and a second dipole antenna assembly 140 . Both the first dipole antenna assembly 110 and the second dipole antenna assembly 140 are excited by the same signal source 190 , wherein the signal source 190 may be a radio frequency (RF) module. The first dipole antenna element 110 operates in a low frequency band, and the second dipole antenna element 140 operates in a high frequency band. For example, the aforementioned low frequency band may be approximately between 2400MHz and 2500MHz, and the aforementioned high frequency band may be approximately between 5150MHz and 5850MHz, so that the antenna system 100 can support dual-band operation of Wi-Fi and Bluetooth.

The first dipole antenna assembly 110 includes a first feeding radiating portion 120 and a first grounding radiating portion 130 . The second dipole antenna assembly 140 includes a second feeding radiating portion 150 and a second grounding radiating portion 160 . The first feeding and radiating part 120 and the first grounding radiating part 130 may respectively be approximately a long rectangle. The second feeding radiating portion 150 and the second grounding radiating portion 160 may each be approximately a short rectangle (for example, the length of the aforementioned longer rectangle is approximately twice the length of the aforementioned shorter rectangle). A first feeding point 111 of the first feeding and radiating part 120 and a second feeding point 141 of the second feeding and radiating part 150 are both coupled to the positive electrode of the signal source 190 . A first ground point 112 of the first ground radiation portion 130 and a second ground point 142 of the second ground radiation portion 160 are both coupled to the negative electrode of the signal source 190 . The first feeding and radiating portion 120 has a protruding portion 125 . The width of the protruding portion 125 is narrower than that of the rest of the first feeding and radiating portion 120 . The first ground radiating portion 130 has an opening slot 135 . The first feeding point 111 is adjacent to the protruding portion 125 , and the first grounding point 112 is adjacent to the opening slot 135 . The protruding portion 125 may be substantially a narrow straight bar, and the open slot 135 may be approximately a wider straight bar, wherein the protruding portion 125 extends into the open slot 135 . In terms of component size, the length of the first feeding radiation part 120 and the length of the first grounding radiation part 130 are approximately equal to a quarter wavelength (λ/4) of a central operating frequency of the aforementioned low frequency band, and the second feeding radiation The length of the portion 150 and the length of the second ground radiating portion 160 are approximately equal to a quarter wavelength (λ/4) of a central operating frequency of the aforementioned high frequency band, and the length L1 of the opening slot 135 is smaller than the aforementioned central operating frequency of the low frequency band. The frequency is one-eighth wavelength (λ/8), and the gap G1 between the protruding portion 125 and the edge of the opening slot 135 is less than 1 mm (for example, the preferred length of the gap G1 is 0.5 mm).

In the present invention, the protruding portion 125 and the opening slot 135 are used to prevent the current in the high frequency band from interfering with the first dipole antenna assembly 110 . In detail, the protruding portion 125 and the opening slot 135 can jointly form an equivalent capacitor having a relatively moderate capacitance value. For the low frequency band, the equivalent capacitor is regarded as an open circuit, so as not to affect the current distribution of the first dipole antenna element 110; for the high frequency band, the equivalent capacitor is regarded as a short circuit (Short Circuit), the high-frequency current can flow from the second feeding and radiating part 150 to the first feeding and radiating part 120, and then return to the second grounding radiating part 160 through the short-circuit path of the protruding part 125 and the opening slot 135 . The design of the present invention can avoid the problem of mutual interference between high-frequency and low-frequency radiation parts that traditional high-gain antennas often face, and it also does not need to adopt the structure of an external frequency divider (with insertion loss). Therefore, the present invention can at least improve the radiation performance of the antenna, The advantages of reducing insertion loss (Insertion Loss) and saving cost are very suitable for various broadband antenna structures.

FIG. 2 shows a schematic diagram of an antenna system 200 according to an embodiment of the present invention. FIG. 2 is similar to FIG. 1 , the difference between the two is that the antenna system 200 of FIG. 2 further includes a first meandering connecting line 271 and a first series-connected radiation portion 272 , wherein the first series-connected radiation portion 272 passes through the first The meandering connecting line 271 is coupled to the first feeding and radiating part 120 . In detail, the protruding portion 125 is located at a first edge 121 of the first feeding and radiating portion 120 , and the first meandering connecting line 271 is coupled to a second edge 122 of the first feeding and radiating portion 120 , wherein the first edge 121 is relative to the second edge 122 . The first serpentine connection line 271 may be substantially a combination of one or more W-shapes. The first serially connected radiation portion 272 may be substantially rectangular. The length of the first meandering connecting line 271 (this refers to the total length after straightening) may be approximately equal to one-half wavelength (λ/2) of the center operating frequency of the aforementioned low frequency band. The length of the first serially connected radiation portion 272 may be approximately equal to one-half wavelength (λ/2) of the center operating frequency of the aforementioned low frequency band. Under this design, it can be seen that the antenna system 200 includes an antenna array formed by the first dipole antenna element 110 , the first meandering connecting line 271 , and the first series-connected radiating portion 272 , wherein the first dipole antenna The component 110 can be used as the main radiator, the first meandering connecting line 271 can generate negative phase radiation, and the first serially connected radiating part 272 can generate positive phase radiation. Since the first serpentine connection line 271 has dense and tortuous current paths, the surface currents on the adjacent sections of the first serpentine connection line 271 present opposite directions. Therefore, from a distance, the aforementioned negative phase radiation will will be almost completely canceled. On the other hand, the positive-phase radiation of the first series-connected radiating portion 272 can constructively interfere with the radiation of the first dipole antenna element 110, thereby improving the overall gain of the antenna array. In other embodiments, the antenna array may also include more meandering connecting lines and more radiating parts in series, not limited to those shown in FIG. 2 . The remaining features of the antenna system 200 of FIG. 2 are similar to those of the antenna system 100 of FIG. 1 , so the two embodiments can achieve similar operating effects.

FIG. 3 shows a schematic diagram of an antenna system 300 according to an embodiment of the present invention. FIG. 3 is similar to FIG. 1 , the difference between the two is that the antenna system 300 in FIG. 3 further includes a coaxial cable 350 and a backflow suppressing component 360 . The coaxial cable 350 includes a central wire 351 and a conductor shell 352, wherein the positive pole of the signal source 190 is coupled to the first feeding point 111 and the second feeding point 141 via the central wire 351, and the negative pole of the signal source 190 is coupled to the first feeding point 111 and the second feeding point 141 via the central wire 351 The conductive housing 352 is coupled to the first ground point 112 and the second ground point 142 . The backflow suppression assembly 360 is coupled to the conductor housing 352 . The backflow suppression component 360 may be substantially L-shaped. The length of the backflow suppression assembly 360 may be approximately equal to one quarter wavelength (λ/4) of the center operating frequency of the low frequency band. The gap G2 between the backflow suppression component 360 and the first dipole antenna component 110 may be approximately between 2 mm and 3 mm. The backflow suppression assembly 360 is used to draw current in the conductor housing 352 to prevent radiation from the coaxial cable 350 . Under this design, the backflow current of the coaxial cable 350 will be concentrated on the backflow suppressing component 360 and form a standing wave (Standing Wave). The pole antenna assembly 110 causes radiated interference. The remaining features of the antenna system 300 of FIG. 3 are similar to those of the antenna system 100 of FIG. 1 , so the two embodiments can achieve similar operating effects.

FIG. 4 shows a schematic diagram of an antenna system 400 according to an embodiment of the present invention. 4 is similar to FIG. 1 , FIG. 2 , and FIG. 3 , the difference therebetween is that the antenna system 400 of FIG. 4 further includes a second meandering connection line 471 , a second series-connected radiating portion 472 , and a third meandering connection Line 473 , a third serially connected radiation portion 474 , a fourth meandering connecting line 273 , and a fourth serially connected radiation portion 274 . The second series-connected radiating portion 472 is coupled to the second feeding radiating portion 150 via the second meandering connecting line 471 . The third serial radiating portion 474 is coupled to the second ground radiating portion 160 via the third meandering connecting line 473 . The length of the second serpentine connection line 471 and the length of the third serpentine connection line 473 (this refers to the total length after straightening) can be approximately equal to one-half wavelength (λ) of the central operating frequency of the aforementioned high frequency band. /2). The length of the second serial radiating portion 472 and the length of the third serial radiating portion 474 may be approximately equal to one-half wavelength (λ/2) of the center operating frequency of the aforementioned high frequency band. The fourth serial radiating portion 274 is coupled to the first serial radiating portion 272 via the fourth meandering connecting line 273 . The length of the fourth serpentine connection line 273 (this refers to the total length after straightening) may be approximately equal to one-half wavelength (λ/2) of the center operating frequency of the aforementioned low frequency band. The length of the fourth serially connected radiation portion 274 may be approximately equal to one-half wavelength (λ/2) of the center operating frequency of the aforementioned low frequency band. These additional meandering connecting lines and radiating parts in series can further improve the antenna gain of the antenna system 400 . The remaining features of the antenna system 400 of FIG. 4 are similar to those of the antenna systems 100 , 200 , and 300 of FIGS. 1 , 2 , and 3 , so these embodiments can achieve similar operating effects.

In summary, the present invention provides an antenna system that can have high gain, low insertion loss, low inter-band interference, and low coaxial cable radiation. The present invention has a simple structure, is easy to implement and operate in various communication devices, and can enjoy the commercial value of mass production.

It should be noted that the above-mentioned device dimensions, device parameters, device shapes, and frequency ranges are not limitations of the present invention. Antenna designers can adjust these settings according to different needs. In addition, the antenna system of the present invention is not limited to the state illustrated in FIGS. 1 to 4 . The present invention may include only any one or more features of any one or more of the embodiments of Figures 1-4. In other words, not all of the illustrated features must be simultaneously implemented in the antenna system of the present invention.

The ordinal numbers in this specification and the claims, such as "first", "second", "third", etc., do not have a sequential relationship with each other, and are only used to indicate and distinguish two identical different components of the name.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art should be able to make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the appended claims.

Claims (20)

1. An antenna system comprising: A first dipole antenna assembly, the first dipole antenna assembly includes a first feed-in radiator and a first ground radiator, wherein the first feed-in radiator has a protruding portion, and the first ground radiator having an open slot, and the protruding portion extends into the open slot to form an equivalent capacitor; and a second dipole antenna assembly, the second dipole antenna assembly includes a second feeding radiating part and a second grounding radiating part; The first dipole antenna element and the second dipole antenna element are both excited by a signal source, the first dipole antenna element operates in a low frequency band, and the second dipole antenna element operates in a high frequency band frequency band. 2 . The antenna system of claim 1 , wherein the first feeding and radiating portion, the first grounding radiating portion, the second feeding and radiating portion, and the second grounding radiating portion are each a rectangle. 3 . 3 . The antenna system of claim 1 , wherein the protruding portion is in the shape of a straight bar and the opening slot is in the shape of a straight bar, and the straight bar width of the protruding portion is narrower than the straight bar width of the opening slot hole 3 . . 4. The antenna system of claim 1, wherein the length of the open slot is less than one-eighth wavelength of a central operating frequency of the low frequency band. 5. The antenna system of claim 1, wherein a gap between the protruding portion and the edge of the open slot is less than 1 mm. 6. The antenna system of claim 1, wherein the protruding portion and the open slot are used to prevent the current in the high frequency band from interfering with the first dipole antenna assembly. 7 . The antenna system of claim 1 , wherein a first feeding point of the first feeding and radiating portion and a second feeding point of the second feeding radiating portion are both coupled to the signal source. 8 . A positive electrode, and a first ground point of the first ground radiating portion and a second ground point of the second ground radiating portion are both coupled to the negative electrode of the signal source. 8. The antenna system of claim 7, wherein the first feed point is adjacent to the protruding portion, and the first ground point is adjacent to the open slot. 9. The antenna system of claim 1, further comprising: a first meandering connecting line; and a first series-connected radiating part, the first serial-connecting radiating part is coupled to the first feeding radiating part through the first meandering connecting line. 10 . The antenna system of claim 9 , wherein the protruding portion is located at a first edge of the first feeding and radiating portion, and the first meandering connecting line is coupled to a first portion of the first feeding and radiating portion. 11 . two edges, and the first edge is opposite to the second edge. 11. The antenna system of claim 9, wherein the first meandering connecting line is a combination of one or more W-shapes. 12. The antenna system of claim 9, wherein the first serial radiating portion is a rectangle. 13. The antenna system of claim 9, wherein the length of the first serpentine connection line is equal to one-half wavelength of a central operating frequency of the low frequency band. 14. The antenna system as claimed in claim 9, wherein the length of the first cascaded radiating portion is equal to one-half wavelength of a central operating frequency of the low frequency band. 15. The antenna system of claim 7, further comprising: A coaxial cable including a center wire and a conductor shell, wherein the positive pole of the signal source is coupled to the first feed point and the second feed point via the center wire, and the The negative electrode of the signal source is coupled to the first ground point and the second ground point via the conductor shell. 16. The antenna system of claim 15, further comprising: A backflow suppression component is coupled to the conductor housing, wherein the backflow suppression component is used for attracting the current of the conductor housing to prevent the coaxial cable from generating radiation. 17. The antenna system of claim 16, wherein the backflow suppressing element is L-shaped. 18. The antenna system of claim 16, wherein the length of the backflow suppression element is equal to one quarter wavelength of a center operating frequency of the low frequency band. 19. The antenna system of claim 16, wherein a gap between the backflow suppression component and the first dipole antenna component is between 2 mm and 3 mm. 20. The antenna system of claim 1, further comprising: a second meandering connecting line; a second series-connected radiating portion, the second series-connected radiating portion is coupled to the second feeding radiating portion through the second meandering connecting line; a third meandering connecting line; and a third serially connected radiating part, the third serially connected radiating part is coupled to the second grounding radiating part through the third meandering connecting line.