TWI449264B - A multi-loop antenna system and a electronic device having the multi-loop antenna system - Google Patents

Description

Multi-loop antenna system and electronic device having the same

The present invention relates to an antenna system, and more particularly to a high gain multi-loop antenna system.

Since current wireless network products are mostly demanding in terms of lightness, shortness and convenience, how to design a small antenna that meets the needs of use has become one of the key technologies for wireless network products to effectively reduce the size; in particular, the design of small antennas is Wireless network products, such as the wireless network bridge (access point, AP) signal reception capability and quality have the most direct relationship, so that how to get the proper antenna performance under the limited space configuration of wireless network products Performance has always been the primary issue for related industries.

The antennas of the conventional outdoor wireless network bridges are mostly printed microstrip antennas and patch antennas, for example, a printed microstrip array antenna disclosed in the Republic of China Patent No. M357719, in which Each array of radiating elements is connected in a manner that is fed into the network with a line, wherein each radiating element is a half-wavelength resonant structure.

However, in the limited space of wireless network products, the area size of the antenna is limited by the physical characteristics of its half-wave resonance, and it is not easy to integrate many independent antenna units, especially in the antenna design of synchronous dual-frequency operation. It is even more difficult. Moreover, the conventional printed microstrip antenna and the planar antenna are fed by a probe-pin feed, so that the layout of a system board in the wireless network product needs to be matched with the antenna. Signal feed point, so when replacing other antennas in wireless network products, the same system board will not be used, and it is not flexible in use.

Accordingly, it is an object of the present invention to provide a multi-loop antenna system that achieves synchronous dual frequency operation and has high directivity and high gain.

Another object of the present invention is to provide a built-in synchronous dual-frequency multi-loop antenna system that is small in size, low-profile, and can be applied to a small outdoor wireless network bridge.

Therefore, the multi-loop antenna system of the present invention comprises: an antenna module and a system module, and the antenna module comprises an antenna substrate, at least one first loop antenna and at least one second loop antenna.

The antenna substrate has a first surface and a second surface opposite to the first surface; the first loop antenna is disposed on the first surface of the antenna substrate, and the first loop antenna includes a first radiator and is respectively located a first feeding end and a first ground end of the first radiating body, and the first feeding end is adjacent to and spaced apart from the first ground end, so that each of the first radiators forms a loop, and a loop antenna provides a first operating frequency band; a second loop antenna is disposed on the first surface or the second surface of the antenna substrate, and the second loop antenna includes a second radiator and is respectively located on the second radiator a second feed end and a second ground end of the two ends, and the second feed end is adjacent to and spaced apart from the second ground end, so that each second radiator forms a loop, and the second loop antenna provides A second operating band. The system module has at least one ground plane facing the second surface of the antenna substrate, and the system module is parallel to the second surface of the antenna substrate at a distance, which can be used to reflect the first loop antenna and the second loop Radiation from the antenna.

Preferably, the number of the first loop antennas and the second loop antennas is two, and the first loop antennas are respectively disposed on opposite sides of the antenna substrate, and the second loop antennas are respectively disposed on the antennas. The other two opposite sides of the substrate, and the geometric center lines of the two first loop antennas are perpendicular to the geometric center lines of the two second loop antennas. Further, the geometric centers of the first loop antennas are respectively the same as the geometric centers of the second loop antennas.

Preferably, each of the first radiators includes a first radiating section extending in one direction, and a second radiating section extending from an end of the first radiating section in a direction perpendicular to the extending direction of the first radiating section, a third radiating section extending in a direction parallel to the extending direction of the first radiating section, and a fourth radiating section extending from an end of the third radiating section in a direction parallel to the extending direction of the second radiating section, and The other end of the first radiating section opposite to the end connected to the second radiating section is a first grounding end, and the other end of the fourth radiating section opposite to the end connected to the third radiating section is a first feeding end.

Preferably, the first loop antenna has the same shape but different area as the second loop antenna. Therefore, each of the second radiators includes a fifth radiating section extending in one direction and an end edge of the fifth radiating section. a sixth radiating section extending perpendicularly to the extending direction of the fifth radiating section, a seventh radiating section extending from the end of the sixth radiating section in a direction parallel to the extending direction of the fifth radiating section, and an end of the seventh radiating section An eighth radiating section extending parallel to the extending direction of the sixth radiating section, and the other end of the fifth radiating section opposite to the end connected to the sixth radiating section is a second feeding end, and the eighth radiating section is connected to the seventh radiating section The other end opposite the end of the segment is the second ground.

Preferably, the area of the antenna substrate is less than or equal to the area of the system module.

The first effect of the present invention is that the first loop antenna and the second loop antenna can synchronously resonate with different frequency bands, and reflect the first loop antenna and the second loop through at least one ground plane on the system module. The radiation of the antenna can make the radiation pattern of the antenna module have high directivity and high antenna gain, which can enhance the communication coverage.

The second effect of the present invention is that it can more effectively utilize the limited space on the single antenna dielectric substrate, implant more loop antennas, and improve the performance of the antenna.

The third effect of the present invention is that the loop antenna is made using a printed circuit board, is simple to manufacture and low in cost, and has a low-profile appearance and a planar structure, which is very suitable for small applications. Outdoor wireless network bridge.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of FIG.

Referring to FIG. 1, a first preferred embodiment of a multi-loop antenna system 100 of the present invention is a multi-loop of a dual-band wireless local area network WLAN (2400-2484/5150-5350 MHz) that can be concurrently operated. In the present embodiment, the multi-loop antenna system 100 includes an antenna module 10 and a system module 20 disposed in parallel with the antenna module 10.

Referring to FIG. 2 , the antenna module 10 includes an antenna substrate 3 , a plurality of first loop antennas 1 , and a plurality of second loop antennas 2 . The antenna substrate 3 is rectangular or arbitrarily polygonal, and is made of an insulating material (for example, glass fiber, FR4). The antenna substrate 3 has a first surface 31 and a second surface 32 opposite to the first surface 31.

In this embodiment, the number of the first loop antenna 1 and the second loop antenna 2 are respectively two, and both are full-wavelength resonant one-wavelength loop antennas, the first time The loop antennas 1 are disposed on the first surface 31 of the antenna substrate 3 and adjacent to the opposite short sides of the antenna substrate 3, respectively, each of which includes a first radiator 11 and a first one at each end of the first radiator 11 A ground point 12 and a first feed point 13 are provided. In one of the first radiators 11, the first radiator 11 has a first radiant section 111 disposed on a short side of the antenna substrate 3 and extending along the short side (ie, the Y-axis), The end of the first radiating section 111 extends along a second radiating section 112 extending perpendicular to the extending direction of the first radiating section 111 (ie, the Z-axis), and an end of the second radiating section 112 is parallel to the first radiating section 111. a third radiating section 113 extending in the extending direction, and a fourth radiating section 114 extending from the end of the third radiating section 113 in a direction parallel to the extending direction of the second radiating section 112. The other end opposite to the end of the first radiating section 111 and the second radiating section 112 is the first grounding end 12, and the other end of the fourth radiating section 114 opposite to the end of the third radiating section 113 is the first feeding end 13 And the first grounding end 12 and the first feeding end 13 are adjacent to each other and spaced apart, such that the first radiating section 111, the second radiating section 112, the third radiating section 113 and the fourth radiating section 114 are connected to each other to form a rectangle Loops and provides a first operating band, but the shape of the loop is not limited to a rectangle. In addition, it is worth noting that the first feed ends 13 of the first loop antennas 1 are symmetrical to each other at the geometric center of the two loop antennas 1 (the phase angle is 180 degrees), which is the farthest between the two. Distance, the isolation between the antennas will be optimal at this time.

The second loop antennas 2 are disposed on the first surface 31 of the antenna substrate 3 and adjacent to the two long sides of the antenna substrate 3, wherein each of the second loops 21 includes a second radiator 21 and two second radiators 21 respectively. A second feed end 22 and a second ground end 23 of the end. Each of the second radiators 21 has a fifth radiating section 215 disposed on a long side of the antenna substrate 3 and extending along the long side (ie, the Z axis), and an end edge of the fifth radiating section 215 a sixth radiating section 216 extending perpendicular to the extending direction of the fifth radiating section 215 (ie, the Y-axis), and a seventh radiating section extending from the end of the sixth radiating section 216 in a direction parallel to the extending direction of the fifth radiating section 215 217, and an eighth radiating section 218 extending from the end of the seventh radiating section 217 in a direction parallel to the extending direction of the sixth radiating section 216. The other end opposite to the end of the sixth radiating section 215 and the sixth radiating section 216 is the second feeding end 22, and the other end of the eighth radiating section 218 opposite to the end connected to the seventh radiating section 217 is the second grounding end 23 And the second feeding end 22 and the second grounding end 23 are adjacent to each other and spaced apart, such that the fifth radiating section 215, the sixth radiating section 216, the seventh radiating section 217 and the eighth radiating section 218 are connected to each other to form a rectangle. Loops and provides a second operating band, and the shape of the loop is also not limited to a rectangle.

In this embodiment, the areas of the first radiator 11 and the second radiator 21 are different, so that the first loop antenna 1 and the second loop antenna 2 can simultaneously resonate at different frequencies to achieve synchronization of the present invention. (concurrent) dual-frequency effect. And the signal transmission lines (not shown) of each of the first loop antennas 1 (or the second loop antennas 2) have the same length, so that the first loop antenna 1 (or the second loop antenna 2) receives and transmits signals. The amplitude of the amplitude is the same as the phase. The loop antenna of the invention has a simple structure, can be used for the production of a printed circuit board (PCB), has low manufacturing cost, and can add more loop antennas than the conventional flat panel array antenna in the same wireless network bridge device. Improve antenna performance and increase overall system data transmission bandwidth.

In addition, in this embodiment, the geometric center positions of the two first loop antennas 1 are on the center line of the two short sides of the antenna substrate 3, and the geometric centers of the two second loop antennas 2 are located in the antenna. The center lines of the two long sides of the substrate 3 are such that the geometric center lines of the two first loop antennas 1 and the geometric center lines of the two second loop antennas 2 are perpendicular to each other (orthogonal), and The geometric centers of the two first loop antennas 1 are respectively the same distance from the geometric center of each of the second loop antennas 2, that is, L1=L2 and L3=L4, so that the antenna of the symmetrical structure allows more The loop antenna system has a more symmetrical signal coverage space in space.

Certainly, the first loop antenna 1 and the second loop antennas 2 can be synchronously translated at equal intervals. As shown in FIG. 3, the two first loop antennas 1 can be respectively along the short sides of the antenna substrate 3. Symmetrical translation, and the two second loop antennas 2 also cooperate to vertically translate up and down along the long sides of the antenna substrate 3, and maintain the geometric centers of the respective first loop antennas 1 and each of the second loop antennas 2 The distance of the geometric center is the same (ie, L1'=L2' and L3'=L4'), but it is not limited to this embodiment. Furthermore, the two first loop antennas 1 and the two second loop antennas 2 of the embodiment can also be a circular loop. As shown in FIG. 4, the synchronous resonance dual-frequency effect of the present invention can also be achieved. .

It is to be noted that, referring to FIG. 2, FIG. 3 and FIG. 4, the first ground end 12 and the first feed end 13 of the first loop antenna 1 and the second feed end of the second loop antenna 2 Both the 22 and the second grounding end 23 are located on the side of the antenna substrate 3 to prevent the signal transmission line (not shown) from being pressed to the first loop antenna 1 and the second loop antenna 2, thereby causing interference between the antenna signal and the system circuit.

Referring to FIG. 1, the system module 20 is a system circuit board having at least one ground plane 201 (eg, a metal surface) facing the second surface 32 of the antenna substrate 3. The ground plane 201 can be regarded as a reflector. (reflector) for reflecting the radiation of the first loop antenna 1 and the second loop antenna 2, thereby not only providing the antenna module 10 with high directivity, but also improving the antenna module 10 in a single Antenna gain in the direction (positive X-axis direction). The system module 20 can be a multi-layer structure, the uppermost layer is a thin metal layer, the lower layer is a dielectric substrate, or can be a circuit layer containing more layers. Moreover, a gap exists between the ground plane (which can be used as a reflective surface) 201 and the second surface 32, and is used as an effective space for electronic components (not shown) on the system module 20. In addition, the area of the antenna substrate 3 of the embodiment is less than or equal to the area of the system module 20 to ensure that the system module 20 can completely reflect the radiation of each of the first loop antenna 1 and the second loop antenna 2.

In addition, referring to FIG. 5, the multi-loop antenna system 100 of the present embodiment is installed in a housing 210 of an electronic device 200 such as an outdoor wireless access point (AP), and is supported by a small coaxial cable. As a signal transmission line (not shown), the mini-coaxial cable feeds the signal to the first feeding end 13 and the second feeding end 22, so that the multi-loop antenna system 100 can be matched with system modules of different applications ( That is, the system board) improves the flexibility in the use of the multi-loop antenna system 100. Of course, the type of signal transmission line is not limited by this embodiment.

6 to FIG. 9 are schematic diagrams showing actual dimensions of the multi-loop antenna system 100 of the present embodiment, wherein FIG. 6 is a plan view of the antenna substrate 3 and the first loop antenna 1 and the second loop antenna 2; 7 and FIG. 8 are top views of the first loop antenna 1 and the second loop antenna 2 respectively; FIG. 9 is a side view between the antenna substrate 3 and the system module 20, and the numbers in each figure are in mm, see The data in the figure is used to know the actual size of the embodiment, but is not limited to this embodiment.

It can be seen from FIG. 7 and FIG. 8 that the first radiating section 111, the second radiating section 112, the third radiating section 113 and the fourth radiating section 114 have the same length, so that the first radiator 11 forms a square loop; the fifth radiating section 215. The sixth radiating section 216, the seventh radiating section 217 and the eighth radiating section 218 are of the same length, so that the second radiator 21 forms a square loop. In the present embodiment, the area of the first radiator 11 is about four times the area of the second radiator 21, so that the first radiator 11 and the second radiator 21 can resonate at frequencies of 2.4 GHz and 5 GHz, respectively. In addition, as shown in FIG. 9, the distance between the antenna substrate 3 and the system module 20 needs to be greater than 5 mm (mm), so that more types of electronic components are placed on the system module (system circuit board) 20. A distance of 5.4 mm (mm) between the embodiments will result in a better antenna gain.

Referring to FIG. 10, FIG. 10 is a reflection coefficient measurement data of each of the first loop antenna 1 and the second loop antenna 2, wherein S ₁₁ and S ₂₂ are reflections of the two first loop antennas 1, respectively. Coefficients; S ₃₃ and S ₄₄ are reflection coefficients of the respective two loop antennas 2, respectively. It can be known from experiments that the center frequency of the first operating band provided by the first loop antenna 1 is 2.4 GHz, and the center frequency of the second operating band provided by the second loop antenna 2 is 5 GHz, and the two are respectively at 2.4 GHz. And the reflection coefficient of 5 GHz is less than minus 10-dB, which conforms to the specifications of the 2.4 GHz and 5 GHz wireless local area network bands, so this embodiment is indeed applicable to the wireless local area network.

Referring to FIG. 11, is an Isolation measurement data diagram of the first loop antenna 1 and the second loop antenna 2, wherein S ₂₁ is an isolation between the two first loop antennas 1; S ₃₁ and S ₄₁ are reflection coefficients between the two second loop antennas 2 and one of the first loop antennas 1 respectively; S ₄₃ is a reflection coefficient between the two second loop antennas 2. It can be known from experiments that the isolation between the first loop antenna 1 and the second loop antenna 2 is on average about minus 30-dB, which has good isolation.

Referring to FIG. 12, a 2-D radiation field type measurement result of the first loop antenna 1 operating at 2442 MHz and the second loop antenna 2 operating at 5250 MHz is shown in FIG. Referring to FIG. 13 and FIG. 14, FIG. 13 is an omnidirectional radiation pattern of the multi-loop antenna system 100 operating at frequencies of 2400 MHz, 2442 MHz, and 2484 MHz; and FIG. 14 is a multi-loop antenna system 100 operating at frequencies of 5150 MHz, 5250 MHz, and 5350MHz omnidirectional radiation pattern. Therefore, as can be seen from FIG. 12 to FIG. 14, the multi-loop antenna system 100 has a high antenna gain in the positive X-axis direction, that is, a high directivity, by the cooperation of the antenna module 10 and the system module 20. Works with wireless network bridges (APs).

FIG. 15 is a graph showing radiation efficiency/antenna gain-frequency of the multi-loop antenna system 100 of the present embodiment. As can be seen from the figure, the maximum gain of the antenna is about 4 dBi and 5 dBi in the 2.4 GHz and 5 GHz bands, respectively, and has high antenna gain characteristics. The radiation efficiency of the antenna is also greater than about 50% and 70%, respectively, which is a good printed antenna efficiency.

Referring to FIG. 16, a second preferred embodiment of the multi-loop antenna system 100 of the present invention is substantially the same as the first preferred embodiment, except that the first loop antenna 1 and the second loop antenna 2 are They are respectively disposed on different surfaces of the antenna substrate 3. In this embodiment, the first loop antennas 1 are disposed on the first surface 31 of the antenna substrate 3, and the second loop antennas 2 are disposed on the second surface 32 of the antenna substrate 3, so that the same Simultaneously receive or transmit dual-frequency signals and achieve high antenna gain.

Referring to FIG. 17, a third preferred embodiment of the multi-loop antenna system 100 of the present invention, the multi-loop antenna system 100 may have only one first loop antenna 1 and one second loop antenna 2, and In the embodiment, the first loop antenna 1 and the second loop antenna 2 are respectively disposed on opposite short sides of the antenna substrate 3, so that the same effect of the synchronous dual-frequency operation of the present invention can be achieved.

In summary, the multi-loop antenna system 100 of the present invention achieves synchronous reception or transmission of signals of different frequency bands by arranging a plurality of first loop antennas 1 and second loop antennas 2 on the antenna substrate 3. And the geometric center of the first loop antenna 1 is the same as the distance between the geometric centers of each of the second loop antennas 2, so that the first loop antenna 1 and the second loop of the multi-loop antenna system 100 are The isolation between the antennas 2 is the same, and the equal loop antennas also have the same radiation field type and signal coverage. In addition, the multi-loop antenna system 100 is integrated with the system module 20, and the radiation of the first loop antenna 1 and the second loop antenna 2 is reflected by at least one ground plane on the system module 20, not only The antenna module 10 is highly directional, and the antenna gain of the antenna module 10 in a single direction (positive X-axis direction) can be improved, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100‧‧‧Multi-loop antenna system

200‧‧‧Electronic devices

210‧‧‧Shell

10‧‧‧Antenna Module

20‧‧‧System Module

201‧‧‧System ground plane

1‧‧‧First loop antenna

11‧‧‧First radiator

111‧‧‧First radiant section

112‧‧‧second radiant section

113‧‧‧The third radiant section

114‧‧‧fourth radiant section

12‧‧‧First ground

13‧‧‧First feed end

2‧‧‧second loop antenna

21‧‧‧Second radiator

215‧‧‧ fifth radiant section

216‧‧‧ sixth radiant section

217‧‧‧ seventh radiant section

218‧‧‧ eighth radiant section

22‧‧‧second feed end

23‧‧‧Second ground

3‧‧‧Antenna substrate

31‧‧‧ first surface

32‧‧‧second surface

Figure 1 is a first preferred embodiment of the multi-loop antenna system of the present invention;

2 is a view showing an aspect in which the first loop antenna and the second loop antenna are disposed on an antenna substrate in the first preferred embodiment;

FIG. 3 is a view showing another aspect of the first loop antenna and the second loop antennas disposed on the antenna substrate in the first preferred embodiment;

4 is a view showing another aspect of the first loop antenna and the second loop antennas disposed on the antenna substrate in the first preferred embodiment;

Figure 5 is an electronic device illustrating a built-in multi-loop antenna system;

6 is a view showing the actual size of the antenna substrate and the first loop antenna and the second loop antenna in the first preferred embodiment;

Figure 7 is a diagram showing the actual size of the first loop antenna in the first preferred embodiment;

Figure 8 is a view showing the actual size of the second loop antenna in the first preferred embodiment;

Figure 9 is a view showing the actual size of the antenna substrate and the system module in the first preferred embodiment;

FIG. 10 is a diagram showing measurement data of reflection coefficients of each of the first loop antenna and the second loop antenna in the first preferred embodiment; FIG.

Figure 11 is a diagram showing the isolation measurement data between the first loop antenna and the second loop antenna in the first preferred embodiment;

Figure 12 is a diagram showing the measurement results of the 2-D radiation pattern of the first loop antenna of the first preferred embodiment at 2442 MHz and the second loop antenna at 5250 MHz;

FIG. 13 is a view showing an omnidirectional radiation pattern of the multi-loop antenna system of the first preferred embodiment at frequencies of 2400 MHz, 2442 MHz, and 2484 MHz;

Figure 14 is a diagram showing the omnidirectional radiation pattern of the multi-loop antenna system of the first preferred embodiment at frequencies of 5150 MHz, 5250 MHz, and 5350 MHz;

Figure 15 is a graph showing the radiation efficiency/antenna gain-frequency curve of the multi-loop antenna system of the first preferred embodiment;

Figure 16 is a diagram showing a second preferred embodiment of the multi-loop antenna system of the present invention; and

Figure 17 is a diagram showing a third preferred embodiment of the multi-loop antenna system of the present invention.

100. . . Multi-loop antenna system

10. . . Antenna module

20. . . System module

201. . . System ground plane

1. . . First loop antenna

2. . . Second loop antenna

3. . . Antenna substrate

31. . . First surface

32. . . Second surface

Claims (9)

A multi-loop antenna system includes: an antenna module, comprising: an antenna substrate having a first surface and a second surface opposite to the first surface; and two first loop antennas disposed on the antenna On the first surface of the antenna substrate, each of the first loop antennas includes a first radiator and a first feed end and a first ground end respectively located at opposite ends of the first radiator, and the first feed The input end is adjacent to and spaced apart from the first ground end, so that the first radiator forms a loop, and the two first loop antennas provide a first operating frequency band, and the two first loop antennas The first feed ends are symmetric with respect to the geometric centers of the two first loop antennas, and the farthest distance between the two is such that the isolation between the two first loop antennas is optimal; Two second loop antennas are disposed on the first surface or the second surface of the antenna substrate, and each of the second loop antennas includes a second radiator and a first end respectively located at the ends of the second radiator a second feed end and a second ground end, and the second feed end and the The two ground ends are adjacent and spaced apart such that the second radiator forms a loop, and the two second loop antennas provide a second operating band; and a system module having at least one opposite thereto a ground plane of the second surface of the antenna substrate, and the system module and the antenna substrate The second surfaces are parallel apart by a distance for reflecting the radiation of the first loop antenna and the second loop antenna. According to the multi-loop antenna system of claim 1, wherein the first loop antennas are respectively disposed on opposite sides of the antenna substrate, and the second loop antennas are respectively disposed on the antenna substrate. The other two opposite sides, and the geometric center lines of the first loop antennas are perpendicular to the geometric center lines of the second loop antennas. The multi-loop antenna system of claim 2, wherein the geometric centers of the first loop antennas are the same as the geometric centers of the second loop antennas, respectively. The multi-loop antenna system of claim 1, wherein the first radiator and the second radiation system form a rectangular loop. The multi-loop antenna system of claim 1, wherein the first radiator and the second radiation system form a circular loop. The multi-loop antenna system of claim 4, wherein the first radiator includes a first radiating section extending in a direction, and an end of the first radiating section is perpendicular to the first a second radiating section extending in a direction in which the radiating section extends, a third radiating section extending from an end of the second radiating section in a direction parallel to an extending direction of the first radiating section, and an end edge of the third radiating section a fourth radiating section extending parallel to the extending direction of the second radiating section, and the other end of the first radiating section opposite to the end connected to the second radiating section is the first grounding end, the fourth radiating section and the connecting The other end of the third radiating section opposite to the end is the first feed end. The multi-loop antenna system according to claim 6, wherein the second radiator includes a fifth radiating section extending in one direction, and an end of the fifth radiating section is perpendicular to the fifth a sixth radiating section extending in a direction in which the radiating section extends, a seventh radiating section extending from an end of the sixth radiating section in a direction parallel to an extending direction of the fifth radiating section, and an end edge of the seventh radiating section An eighth radiating section extending parallel to the extending direction of the sixth radiating section, and the other end of the fifth radiating section opposite to the end connected to the sixth radiating section is the second feeding end, the eighth radiating section and The other end opposite to the end of the seventh radiant section is the second ground. The multi-loop antenna system according to claim 1, wherein the antenna substrate has an area smaller than or equal to an area of the system module. An electronic device having a multi-loop antenna system includes: a housing; an antenna module mounted in the housing, the antenna module comprising: an antenna substrate having a first surface and an opposite a second surface of the first surface; two first loop antennas disposed on the first surface of the antenna substrate, each of the first loop antennas includes a first radiator and are respectively located on the first radiator a first feed end and a first ground end of the two ends, and the first feed end is adjacent to and spaced apart from the first ground end, so that the first radiator forms a loop, and the two a loop antenna provides a first operating frequency band, and the first feed ends of the two first loop antennas are symmetric with each other a geometric center of the loop antenna, and the farthest distance between the two, so that the isolation between the two first loop antennas is optimal; and two second loop antennas are disposed on the antenna substrate Each of the second loop antennas includes a second radiator and a second feed end and a second ground end respectively located at opposite ends of the second radiator, and the second surface The second feed end is adjacent to and spaced apart from the second ground end, so that the second radiator forms a loop, and the two second loop antennas provide a second operating frequency band; and a system module Provided in the housing, having at least one grounding surface facing the second surface of the antenna substrate, and the system module is spaced apart from the second surface of the antenna substrate by a distance, which can be used to reflect the Radiation of the first loop antenna and the second loop antenna.