Antenna system

Abstract

The present invention provides an antenna system, which includes a ground plane, a first antenna unit, a second antenna unit, a first grounding unit, and a second grounding unit. The ground plane includes a first side and a second side; the first grounding unit and the ground plane together form a first closed loop, and the physical length of the first grounding unit is matched to a first high-frequency signal and a second high-frequency signal to provide grounding for the first high-frequency signal and the second high-frequency signal; the second grounding unit forms a second closed loop and is connected to the first grounding unit, and the physical length of the second grounding unit is greater than the physical length of the first grounding unit; the sum of the physical length of the second grounding unit and the physical length of the first grounding unit is matched to a first low-frequency signal and a second low-frequency signal to jointly provide grounding for the first low-frequency signal and the second low-frequency signal.

Description

Technical Field

[0001] The present invention relates to an antenna system, and particularly to an antenna system that uses the ground wire decoupling effect to achieve isolation. Background Art

[0002] With the progress of wireless communication technology, the demand for data transmission volume has also increased. To meet the huge data transmission volume, a wireless communication system uses an antenna system architecture of a multi-input multi-output (MIMO) system to achieve wireless data transmission. In a MIMO system, two or more antenna architectures each transmit different signals. However, when the isolation between antennas is poor, interference occurs between the antennas, resulting in signal loss and a decrease in the system transmission rate.

[0003] According to traditional antenna design, a specific distance greater than at least between two antennas is required to prevent interference between the antennas and achieve good antenna isolation. However, currently, electronic devices are designed to be miniaturized. For example, mobile communication handheld devices and wearable devices have reduced the volume of the electronic devices based on the good experience of users, thereby restricting the space where antennas can be set. When the distance between the two antennas set cannot be maintained at least a specific distance, the antenna isolation is relatively poor, interference occurs between the antennas, and the transmission quality thus deteriorates. Summary of the Invention

[0004] In view of the above problems in the current technology, the object of the present invention is to provide an antenna system.

[0005] In some embodiments, an antenna system includes a ground plane, a first antenna unit, a second antenna unit, a first grounding unit, and a second grounding unit. The ground plane includes a first side and a second side. The first antenna unit is connected to the first side and is used to receive and transmit a first high-frequency signal and a first low-frequency signal. The second antenna unit is connected to the second side and is used to receive and transmit a second high-frequency signal and a second low-frequency signal. The closed end of the first grounding unit is connected to the first side, and the other closed end of the first grounding unit is connected to the second side to jointly form a first closed loop with the ground plane. The physical length of the first grounding unit matches the first high-frequency signal and the second high-frequency signal to provide grounding for the first high-frequency signal and the second high-frequency signal. The second grounding unit forms a second closed loop. The second grounding unit is connected to the first grounding unit. The physical length of the second grounding unit is greater than the physical length of the first grounding unit. Wherein, the sum of the physical lengths of the second grounding unit and the first grounding unit matches the first low-frequency signal and the second low-frequency signal, and the second grounding unit and the first grounding unit jointly provide grounding for the first low-frequency signal and the second low-frequency signal.

[0006] In some embodiments, an antenna system includes a ground plane, a first antenna unit, a second antenna unit, a first grounding unit, and a second grounding unit. The ground plane includes a first side and a second side. The first antenna unit is connected to the first side and is configured to receive and transmit a first high-frequency signal and a first low-frequency signal. The second antenna unit is connected to the second side and is configured to receive and transmit a second high-frequency signal and a second low-frequency signal. A closed end of the first grounding unit is connected to the first side, and another closed end of the first grounding unit is connected to the second side to jointly form a closed loop of the first grounding unit with the ground plane. The physical length of the first grounding unit is matched to the first high-frequency signal and the second high-frequency signal to provide grounding for the first high-frequency signal and the second high-frequency signal. The second grounding unit forms a closed loop of the second grounding unit. The second grounding unit is connected to the first grounding unit. The physical length of the second grounding unit is less than the physical length of the first grounding unit. Wherein, the sum of the physical lengths of the second grounding unit and the first grounding unit is matched to the first low-frequency signal and the second low-frequency signal, and the second grounding unit and the first grounding unit jointly provide grounding for the first low-frequency signal and the second low-frequency signal.

[0007] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention. Description of the Drawings

[0008] Figure 1 FIG. is a schematic diagram of an embodiment of an antenna system according to the present invention;

[0009] Figure 2 FIG. is a schematic diagram of another embodiment of an antenna system according to the present invention;

[0010] Figure 3 For Figure 1 FIG. is a schematic diagram of an embodiment of the dimensions of the antenna system of;

[0011] Figure 4 For Figure 1 FIG. is a reflection loss diagram of an embodiment of the antenna system of at each operating frequency;

[0012] Figure 5 For Figure 1 FIG. is a radiation pattern diagram formed by an embodiment of the first antenna unit of the antenna system of;

[0013] Figure 6 For Figure 1 FIG. is a radiation pattern diagram formed by an embodiment of the second antenna unit of the antenna system of;

[0014] Figure 7 For Figure 1 FIG. is a radiation pattern diagram formed by another embodiment of the first antenna unit of the antenna system of;

[0015] Figure 8 For Figure 1 the radiation pattern formed by another embodiment of the second antenna unit of the antenna system.

[0016] Wherein, the reference numerals

[0017] 1: First antenna unit

[0018] 2: Second antenna unit

[0019] 3: Ground plane

[0020] 41: First grounding unit

[0021] 411: Protrusion

[0022] 42: Second grounding unit

[0023] 421: Protrusion

[0024] 51: First grounding unit

[0025] 511: Protrusion

[0026] 52: Second grounding unit

[0027] 521: Protrusion

[0028] E1: Closed end

[0029] E2: Closed end

[0030] A1: Included angle

[0031] S1: First side

[0032] S2: Second side

[0033] G1: First coupling distance

[0034] G2: Second coupling distance

[0035] G3: Third coupling distance

[0036] G4: Fourth coupling distance

[0037] D1: First projection direction

[0038] D2: Second projection direction

[0039] L1: Length

[0040] L2: Length

[0041] L3: Length

[0042] L4: Length

[0043] L5: Length

[0044] L6: Length

[0045] L7: Length

[0046] L8: Length

[0047] L9: Length

[0048] L10: Length

[0049] L11: Length

[0050] L12: Length

[0051] L13: Length

[0052] L14: Length

[0053] a: Curve

[0054] b: Curve

[0055] c: Curve Detailed implementation manners

[0056] The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings:

[0057] Please refer to Figure 1 , Figure 1 An antenna system that uses the ground wire decoupling effect to achieve isolation. The antenna system includes two antenna units that support dual-frequency signals (for convenience of description, hereinafter referred to as the first antenna unit 1 and the second antenna unit 2 respectively), two grounding units (hereinafter referred to as the first grounding unit 41 and the second grounding unit 42 respectively), and a ground plane 3. The ground plane 3 includes a first side S1 and a second side S2. The first antenna unit 1 is connected to the first side S1 and grounded, and the second antenna unit 2 is connected to the second side S2 and grounded.

[0058] The first grounding unit 41 includes two closed ends E1, E2. The closed end E1 is connected to the first side S1, and the closed end E2 is connected to the second side S2. Therefore, a closed loop (hereinafter referred to as the first closed loop) is jointly formed between the first grounding unit 41 and the first side S1, the second side S2. The second grounding unit 42 is connected to the first grounding unit 41. The physical length of the second grounding unit 42 is greater than the physical length of the first grounding unit 41. The second grounding unit 42 separately forms another closed loop (hereinafter referred to as the second closed loop). The first grounding unit 41 and the second grounding unit 42 can further provide grounding for the first antenna unit 1 and the second antenna unit 2.

[0059] Specifically, the first antenna unit 1 can receive and transmit high-frequency signals (hereinafter referred to as the first high-frequency signals), and the first antenna unit 1 can receive and transmit low-frequency signals (hereinafter referred to as the first low-frequency signals). There is a first coupling distance G1 between the first antenna unit 1 and the grounding units 41 and 42. Based on the first high-frequency signals, the physical length of the first grounding unit 41 matches the first high-frequency signals, that is, the first closed loop matches the first high-frequency signals, which means that the physical length of the first grounding unit 41 is substantially 1 / 4 wavelength distance of the first high-frequency signals. Compared with the original grounding of the first antenna unit 1, the first grounding unit 41 can further provide grounding for the first high-frequency signals. Moreover, based on the first low-frequency signals, the sum of the physical length of the first grounding unit 41 and the physical length of the second grounding unit 42 matches the first low-frequency signals, that is, the first closed loop and the second closed loop together match the first low-frequency signals, which means that the sum of the physical length of the first grounding unit 41 and the physical length of the second grounding unit 42 is substantially 1 / 4 wavelength distance of the first low-frequency signals. The first grounding unit 41 and the second grounding unit 42 can jointly further provide grounding for the first low-frequency signals.

[0060] The second antenna unit 2 can receive and transmit high-frequency signals (hereinafter referred to as the second high-frequency signals), and the second antenna unit 2 can receive and transmit low-frequency signals (hereinafter referred to as the second low-frequency signals). There is a second coupling distance G2 between the second antenna unit 2 and the grounding units 41 and 42. Based on the second high-frequency signals, the physical length of the first grounding unit 41 matches the second high-frequency signals, that is, the first closed loop matches the second high-frequency signals, which means that the physical length of the first grounding unit 41 is substantially 1 / 4 wavelength distance of the second high-frequency signals. Compared with the original grounding of the second antenna unit 2, the first grounding unit 41 can further provide grounding for the second high-frequency signals. Moreover, based on the second low-frequency signals, the sum of the physical length of the first grounding unit 41 and the physical length of the second grounding unit 42 also matches the second low-frequency signals, that is, the first closed loop and the second closed loop also together match the second low-frequency signals, which means that the sum of the physical length of the first grounding unit 41 and the physical length of the second grounding unit 42 is substantially 1 / 4 wavelength distance of the second low-frequency signals. The first grounding unit 41 and the second grounding unit 42 can jointly further provide grounding for the second low-frequency signals.

[0061] In another embodiment, please refer to Figure 2 , Figure 2 which is a schematic diagram of another embodiment of the antenna system according to the present invention. Figure 2 The antenna system of Figure 1 differs from the antenna system of Figure 2An example shows a first grounding unit 51 and a second grounding unit 52. The physical length of the first grounding unit 51 is greater than that of the second grounding unit 52. Specifically, the first grounding unit 51 includes two closed ends E1 and E2. The closed end E1 is connected to the first side S1, and the closed end E2 is connected to the second side S2. Therefore, a closed loop (hereinafter referred to as the first closed loop) is jointly formed between the first grounding unit 51 and the first side S1 and the second side S2. The second grounding unit 52 is connected to the first grounding unit 51. The physical length of the second grounding unit 52 is less than that of the first grounding unit 51. The second grounding unit 52 separately forms another closed loop (hereinafter referred to as the second closed loop). The first grounding unit 51 and the second grounding unit 52 can further ground the first antenna unit 1 and the second antenna unit 2.

[0062] There is a third coupling distance G3 between the first antenna unit 1 and the grounding units 51 and 52. Based on the first high-frequency signal, the physical length of the first grounding unit 51 matches the first high-frequency signal, that is, the first closed loop matches the first high-frequency signal. That is to say, the physical length of the first grounding unit 51 is substantially 1 / 4 wavelength distance of the first high-frequency signal. Compared with the original grounding of the first antenna unit 1, the first grounding unit 51 can further ground the first high-frequency signal. And, based on the first low-frequency signal, the sum of the physical length of the first grounding unit 51 and the physical length of the second grounding unit 52 matches the first low-frequency signal, that is, the first closed loop and the second closed loop jointly match the first low-frequency signal. That is to say, the sum of the physical length of the first grounding unit 51 and the physical length of the second grounding unit 52 is substantially 1 / 4 wavelength distance of the first low-frequency signal. The first grounding unit 51 and the second grounding unit 52 can jointly further ground the first low-frequency signal.

[0063] There is a fourth coupling distance G4 between the second antenna unit 2 and the grounding units 51 and 52. Based on the second high-frequency signal, the physical length of the first grounding unit 51 matches the second high-frequency signal, that is, the first closed loop also matches the second high-frequency signal. That is to say, the physical length of the first grounding unit 51 is substantially 1 / 4 wavelength distance of the second high-frequency signal. Compared with the original grounding of the second antenna unit 2, the first grounding unit 51 can further ground the second high-frequency signal. And, based on the second low-frequency signal, the sum of the physical length of the first grounding unit 51 and the physical length of the second grounding unit 52 also matches the second low-frequency signal, that is, the first closed loop and the second closed loop also jointly match the second low-frequency signal. That is to say, the sum of the physical length of the first grounding unit 51 and the physical length of the second grounding unit 52 is substantially 1 / 4 wavelength distance of the second low-frequency signal. The first grounding unit 51 and the second grounding unit 52 can jointly further ground the second low-frequency signal.

[0064] Based on this, when the feeding signal excites the antenna units 1 and 2 respectively, by means of the additionally provided first grounding units 41, 51 and second grounding units 42, 52, the first grounding units 41, 51 and the second grounding units 42, 52 can further provide grounding for the antenna units 1 and 2 when receiving and transmitting high-frequency and low-frequency signals, so that the distance between the first antenna unit 1 and the second antenna unit 2 can be relatively small without mutual interference, and the antenna system can have good antenna isolation, thus maintaining good transmission quality of the antenna system.

[0065] In some embodiments, such as Figure 1 and Figure 2 shown, the ground plane 3 includes at least two or more side edges. Among them, an included angle A1 is formed between the adjacent first side edge S1 and the second side edge S2 among the multiple side edges. The included angle A1 can be an included angle less than 180 degrees, that is, the first side edge S1 and the second side edge S2 intersect but are not in a straight line. In some embodiments, the first side edge S1 of the ground plane 3 can be perpendicular to the second side edge S2, and the first side edge S1 and the second side edge S2 intersect and form an included angle A1 of 90 degrees.

[0066] In some embodiments, such as Figure 1 and Figure 2 shown, the closed ends E1 of the first grounding units 41, 51 are connected to the first side edge S1, and the closed ends E2 are connected to the second side edge S2. In other words, the first grounding units 41, 51 are arranged on the reverse angle that has the same vertex as the included angle A1 and is complementary to the included angle A1 to form a circle (360-degree angle). The closed ends E1, E2 are respectively connected to the two sides of the reverse angle, and the two sides of the reverse angle are the first side edge S1 and the second side edge S2. Among them, the second grounding units 42, 52 are connected to the first grounding units 41, 51. When the first grounding units 41, 51 and the second grounding units 42, 52 are vertically projected along the first projection direction D1 parallel to the first side edge S1, at least a part of the vertical projections of the first grounding units 41, 51 and the second grounding units 42, 52 overlap the first antenna unit 1; when the second antenna unit 2 is vertically projected along the first projection direction D1, the vertical projection of the second antenna unit 2 does not overlap the first antenna unit 1. On the other hand, when the first grounding units 41, 51 and the second grounding units 42, 52 are vertically projected along the second projection direction D2 parallel to the second side edge S2, at least a part of the vertical projections of the first grounding units 41, 51 and the second grounding units 42, 52 overlap the second antenna unit 2; when the first antenna unit 1 is vertically projected along the second projection direction D2, the vertical projection of the first antenna unit 1 does not overlap the second antenna unit 2.

[0067] In some embodiments, please refer to Figure 3, the length L1 can be 2.25 millimeters (mm), the length L2 can be 3.5 mm, the length L3 can be 5.25 mm, the length L4 can be 3.5 mm, the length L5 can be 8.05 mm, the length L6 can be 9.25 mm, the length L7 can be 9.8 mm, the length L8 can be 7.25 mm, the length L9 can be 10 mm, the length L10 can be 15.5 mm, the length L11 can be 11.25 mm, the length L12 can be 10.5 mm, the length L13 can be 10 mm, the length L14 can be 15.5 mm. The lengths of the first coupling distance G1, the second coupling distance G2, the third coupling distance G3, and the fourth coupling distance G4 can be 5 mm - 10 mm.

[0068] In some embodiments, please refer to Figure 4 , Figure 4 is Figure 1 the reflection loss graph of the antenna system at each operating frequency. Among them, curve a represents the first antenna unit 1, curve b represents the second antenna unit 2, and curve c represents the antenna isolation, which is an indicator of the antenna interference situation. It can be known from Figure 4 that the high-frequency operating frequency band of the first antenna unit 1 and the second antenna unit 2 can be distributed between 5 - 6 GHz, and the low-frequency operating frequency bands are respectively distributed between 2.4 - 2.5 GHz.

[0069] In some embodiments, please refer to Figures 5 - 8 , Figure 5 , Figure 6 are respectively the radiation patterns generated by the first antenna unit 1 and the second antenna unit 2 of the antenna system according to Figure 1 at the low-frequency operating frequency of 2.45 GHz, Figure 7 , Figure 8 are the radiation patterns generated by the first antenna unit 1 and the second antenna unit 2 of the antenna system according to Figure 1 at the high-frequency operating frequency of 5.5 GHz. Among them, Figure 5 the peak gain of the radiation pattern can be 2.57 dBi, and the efficiency can be 55.66%; Figure 6 the peak gain of the radiation pattern can be 0.71 dBi, and the efficiency can be 59.27%; Figure 7 the peak gain of the radiation pattern can be 2.62 dBi, and the efficiency can be 60.33%; Figure 8 the peak gain of the radiation pattern can be 3.58 dBi, and the efficiency can be 61.41%. According to Figures 5 - 8It can be known that the antenna system provided with the grounding units 41 and 42 has excellent radiation field pattern energy, maximum gain, and efficiency values. Based on this, setting the grounding unit in the antenna system can effectively isolate the mutual interference generated between multiple antenna units, thereby enhancing the overall reception quality of the antenna system.

[0070] In some embodiments, the first grounding units 41 and 51 and the second grounding units 42 and 52 can be of any geometric shape. Among them, when the space where the antenna system is arranged in the electronic device is limited, the partial widths of the first grounding units 41 and 51 and the second grounding units 42 and 52 can be increased to shorten the length of the closed loop of the first grounding units 41 and 51 (i.e., the length between the closed ends E1 and E2 of the first grounding units 41 and 51) and the length of the closed loop of the second grounding units 42 and 52. Specifically, as Figure 1 and Figure 2 shown, the first grounding units 41 and 51 and the second grounding units 42 and 52 are respectively exemplified by squares. The protruding portion 411 is provided at one of the right angles of the first grounding unit 41, the protruding portion 421 is provided at the four right angles of the second grounding unit 42, the protruding portion 511 is provided at three of the right angles of the first grounding unit 51, and the protruding portion 521 is provided at one of the right angles of the second grounding unit 52. Based on this, when the space where the antenna system is arranged in the electronic device is limited, the first grounding units 41 and 51 and the second grounding units 42 and 52 can provide high-frequency or low-frequency signal grounding for the first grounding units 41 and 51 and the second grounding units 42 and 52 through the protruding portions 411, 421, 511, and 521 with increased partial widths, so as to continuously provide good reception quality for the overall antenna system when the antenna unit receives and transmits high-frequency or low-frequency signals.

[0071] In some embodiments, the antenna system can be printed on a Printed Circuit Board (PCB). The first antenna unit 1, the second antenna unit 2, the first grounding units 41 and 51, and the second grounding units 42 and 52 can be metal traces on the printed circuit board. The first antenna unit 1, the second antenna unit 2, the first grounding units 41 and 51, and the second grounding units 42 and 52 can be made of conductive materials (such as silver, copper, aluminum, iron, or their alloys). The ground plane 3 can be the metal casing of the electronic device applied to the antenna system or the common ground plane of each electronic component of the electronic device. In some embodiments, the first antenna unit 1 and the second antenna unit 2 can be designed as Planar inverted-F antennas (PIFA).

[0072] In summary, according to an embodiment of the antenna system of the present invention, the two antenna units can be set without being limited by the size of the electronic device. When the distance between the two antennas cannot be maintained at least a specific distance due to the small size of the electronic device, the antenna system can provide high-frequency or low-frequency signal grounding according to the grounding unit, so that the antenna units can maintain good antenna isolation when receiving and transmitting high-frequency or low-frequency signals, and mutual interference caused by too close a distance between the antenna units can be avoided. Therefore, the good transmission quality of the antenna system is enhanced, and since the volume of the electronic device is maintained small, the manufacturing cost of the electronic device is also saved.

[0073] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. An antenna system, characterized in that, Comprising: A ground plane including a first side edge and a second side edge; A first antenna unit connected to the first side edge, the first antenna unit being used for receiving and transmitting a first high-frequency signal and a first low-frequency signal; A second antenna unit connected to the second side edge, the second antenna unit being used for receiving and transmitting a second high-frequency signal and a second low-frequency signal; A first grounding unit, one closed end of the first grounding unit is connected to the first side edge, and the other closed end of the first grounding unit is connected to the second side edge to jointly form a first closed loop with the ground plane. The physical length of the first grounding unit matches the first high-frequency signal and the second high-frequency signal to provide grounding for the first high-frequency signal and the second high-frequency signal. A first protrusion is provided at a right angle of the first grounding unit; and A second grounding unit forming a second closed loop, the second grounding unit is connected to the first grounding unit, the physical length of the second grounding unit is greater than the physical length of the first grounding unit, a second protrusion is provided at a right angle of the second grounding unit, and the first protrusion is connected to the second protrusion; Wherein, the sum of the physical lengths of the second grounding unit and the first grounding unit matches the first low-frequency signal and the second low-frequency signal, and the second grounding unit and the first grounding unit jointly provide grounding for the first low-frequency signal and the second low-frequency signal.

2. The antenna system according to claim 1, characterized in that, There is an angle less than 180 degrees between the first side edge and the second side edge.

3. The antenna system according to claim 2, wherein The first side edge is perpendicular to the second side edge.

4. The antenna system according to claim 1, characterized in that The perpendicular projections of the first grounding unit and the second grounding unit along a first projection direction parallel to the first side edge overlap the first antenna unit.

5. The antenna system according to claim 4, characterized in that, The perpendicular projections of the first grounding unit and the second grounding unit along a second projection direction parallel to the second side edge overlap the second antenna unit, and the first projection direction is perpendicular to the second projection direction.

6. An antenna system, characterized in that, Comprising: A ground plane including a first side edge and a second side edge; A first antenna unit connected to the first side edge, the first antenna unit being used for receiving and transmitting a first high-frequency signal and a first low-frequency signal; A second antenna unit connected to the second side edge, the second antenna unit being used for receiving and transmitting a second high-frequency signal and a second low-frequency signal; A first grounding unit, one closed end of the first grounding unit is connected to the first side edge, and the other closed end of the first grounding unit is connected to the second side edge to jointly form the closed loop of the first grounding unit with the ground plane. The physical length of the first grounding unit matches the first high-frequency signal and the second high-frequency signal to provide grounding for the first high-frequency signal and the second high-frequency signal. A first protrusion is provided at a right angle of the first grounding unit; And A second grounding unit forming the closed loop of the second grounding unit, the second grounding unit is connected to the first grounding unit, the physical length of the second grounding unit is less than the physical length of the first grounding unit, a second protrusion is provided at a right angle of the second grounding unit, and the first protrusion is connected to the second protrusion; Wherein, the sum of the physical length of the second grounding unit and the physical length of the first grounding unit matches the first low-frequency signal and the second low-frequency signal, and the second grounding unit and the first grounding unit jointly provide grounding for the first low-frequency signal and the second low-frequency signal.

7. The antenna system according to claim 6, characterized in that, There is an angle greater than zero degrees between the first side and the second side.

8. The antenna system according to claim 7, wherein The first side is perpendicular to the second side.

9. The antenna system according to claim 6, wherein The first grounding unit and the second grounding unit overlap the first antenna unit in a vertical projection along a first projection direction parallel to the first side.

10. The antenna system according to claim 9, characterized in that, The first grounding unit and the second grounding unit overlap the second antenna unit in a vertical projection along a second projection direction parallel to the second side, and the first projection direction is perpendicular to the second projection direction.

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