A mobile phone antenna based on an improved huygens antenna

Abstract

The application discloses a mobile phone antenna based on an improved Huygens antenna, which is characterized in that: the traditional Huygens antenna is placed on the top of a dielectric substrate, and the Huygens antennas on two dielectric substrates are close to each other; the shape of a metal grounding plate is modified; when the included angle between the two dielectric substrates is 90 degrees, the antenna works in a dual polarization state; and when the included angle between the two dielectric substrates is 180 degrees, the antenna works in a linear polarization state. The application introduces the traditional Huygens antenna without a grounding plate into the application of a mobile phone antenna, adds a metal grounding plate required by the mobile phone under the traditional Huygens antenna without a grounding plate, and modifies the metal grounding plate, so that the terminal antenna has the advantages of high efficiency and low back radiation, and the feeding structure is more stable; the radiation energy is concentrated in the upper half space, and the stability of the connection between the mobile phone and satellite communication is further enhanced, and the satellite communication experience of users of a double-folded mobile phone is improved.

Description

Technical Field

[0001] This invention belongs to the field of wireless satellite communication and antenna technology, specifically a mobile phone antenna based on an improved Huygens antenna, which can be used in dual-folding screen mobile phones. Background Technology

[0002] With the continuous development of smartphones, foldable screen phones have gradually gained popularity among users. However, research on antennas for foldable screen phones is still relatively limited. Satellite communication capabilities allow users to maintain contact with the outside world even in areas where terrestrial communication base stations cannot provide coverage, such as deserts, mountains, and oceans. Therefore, this feature has been well-received by users. Currently, the satellite communication frequency bands used by mobile terminals are primarily the S-band, specifically the 1980-2100 / 2170-2200MHz uplink and downlink bands with a bandwidth of 30MHz, and the 2483.5-2500MHz downlink band with a bandwidth of 16.5MHz.

[0003] An important indicator of mobile phone antennas is the overall efficiency of the terminal antenna. Currently, mobile phone antennas mainly include monopole antennas, loop antennas, and PIFA antennas. These antennas have low efficiency inside the mobile phone. Antenna efficiency can be improved by adding parasitic radiators and matching circuits, but the additional structure occupies space inside the mobile phone. Summary of the Invention

[0004] The purpose of this invention is to propose a mobile phone antenna based on an improved Huygens antenna. This antenna is suitable for dual-folding screen mobile phones and can work when the two screens of the folding screen mobile phone are fully unfolded and at a 90° angle. This antenna has the characteristics of high efficiency and low back radiation.

[0005] The technical solution to achieve the purpose of this invention is as follows: a mobile phone antenna based on an improved Huygens antenna, comprising: a first dielectric substrate and a second dielectric substrate, wherein the angle between the first dielectric substrate and the second dielectric substrate is 90° or 180°; a first Huygens antenna and a second Huygens antenna with identical structures respectively disposed on the first dielectric substrate and the second dielectric substrate, wherein the first dielectric substrate and the second dielectric substrate are respectively provided with a first metal ground plane and a second metal ground plane; the first Huygens antenna and the second Huygens antenna are excited by a first coaxial cable and a second coaxial cable respectively; the structures on the first dielectric substrate and the second dielectric substrate are mirror-symmetrical about the intersection line of the two dielectric substrates.

[0006] Preferably, the first Huygens antenna includes an electric dipole, a magnetic dipole, and an excitation source. The electric dipole is attached to the upper surface of the first dielectric substrate, the magnetic dipole is attached to the lower surface of the first dielectric substrate, and the excitation source is located on one side of the magnetic dipole. The excitation source is used to excite a ring current on the magnetic dipole.

[0007] Preferably, the excitation source includes L-shaped metal strips respectively attached to the upper and lower surfaces of the first dielectric substrate. The L-shaped metal strip attached to the upper surface of the first dielectric substrate is connected to the inner core of the coaxial cable, and the L-shaped metal strip attached to the lower surface of the first dielectric substrate is connected to the metal ground plane.

[0008] Preferably, the electric dipole is a rectangular metal strip with U-shaped metal strips loaded at both ends.

[0009] Preferably, the magnetic dipole is a rectangular ring structure.

[0010] Preferably, the second metal ground plane has the same structure as the first metal ground plane, and the first metal ground plane has a rectangular chamfer located at a position not connected to the second metal ground plane and close to the first Huygens antenna; the first metal ground plane has two parallel straight grooves.

[0011] Preferably, the length of the rectangular chamfer is 54mm and the width is 31mm, and the length of the first straight groove and the width of the second straight groove are 29mm and 2mm respectively.

[0012] Preferably, the distances from the first Huygens antenna and the second Huygens antenna to the intersection line of the first dielectric substrate and the second dielectric substrate are both 0.385 mm.

[0013] Compared with the prior art, the significant advantages of this invention are:

[0014] 1. This invention introduces Huygens antennas into the antenna design of foldable screen mobile phones and reasonably places the positions of the two Huygens antennas, thereby achieving a higher overall efficiency of the terminal antenna;

[0015] 2. This invention enables the application of Huygens antennas in mobile phones by adding a ground plane required for mobile phones below a traditional Huygens antenna without a ground plane and modifying the ground plane, while still maintaining the advantages of high efficiency and low back radiation.

[0016] 3. The excitation source of a traditional Huygens antenna needs to be directly connected to the inner and outer conductors of the coaxial cable by welding. The excitation source of the present invention includes two L-shaped metal strips respectively attached to the upper and lower surfaces of the dielectric substrate. The L-shaped metal strip attached to the upper surface is connected to the inner core of the coaxial cable, and the L-shaped metal strip attached to the lower surface is connected to the metal ground plane, making the feeding structure more stable.

[0017] 4. The antenna design provided by this invention is simple to implement and can make the terminal antenna work at any frequency by adjusting the effective electrical dimensions of the Huygens antenna, thus having universality. Attached Figure Description

[0018] Figure 1This is a structural diagram of a mobile phone antenna based on an improved Huygens antenna proposed in this invention, where the included angle between the two dielectric substrates is 90°.

[0019] Figure 2 This is a structural diagram of a mobile phone antenna based on an improved Huygens antenna proposed in this invention, where the included angle between the two dielectric substrates is 180°.

[0020] Figure 3 This is a detailed structural diagram of a Huygens antenna on a first dielectric substrate (1) of a mobile phone antenna based on an improved Huygens antenna proposed in this invention. Figure 3 (a) shows the surface structure of the dielectric substrate. Figure 3 (b) is the structure of the lower surface of the dielectric substrate. The structures on the first dielectric substrate (1) and the second dielectric substrate (2) are mirror-symmetrical about the intersection line of the two dielectric substrates.

[0021] Figure 4 This is a port S-parameter diagram of a mobile phone antenna based on an improved Huygens antenna proposed in this invention, when the included angle between the two dielectric substrates is 90°.

[0022] Figure 5 This is a port S-parameter diagram of a mobile phone antenna based on an improved Huygens antenna proposed in this invention, when the included angle between the two dielectric substrates is 180°.

[0023] Figure 6 This is a diagram showing the overall efficiency of a mobile phone antenna based on an improved Huygens antenna proposed in this invention.

[0024] Figure 7 This invention presents the radiation pattern of a mobile phone antenna based on an improved Huygens antenna at a frequency of 2.49 GHz when the included angle between the two dielectric substrates is 90°. Figure 7 (a) is the XOZ surface radiation pattern at this frequency. Figure 7 (b) is the radiation pattern of the YOZ surface at this frequency.

[0025] Figure 8 This invention presents a radiation pattern at 2.49 GHz for a mobile phone antenna based on an improved Huygens antenna, where the included angle between the two dielectric substrates is 180°. Figure 7 (a) shows the E-plane radiation pattern at this frequency. Figure 7 (b) is the H-plane radiation pattern at this frequency. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0027] First, it should be stated that in the description of this application, the terms "horizontal", "vertical", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0029] like Figures 1-2 As shown, a mobile phone antenna based on an improved Huygens antenna includes: a first dielectric substrate 1 and a second dielectric substrate 2, wherein the angle between the first dielectric substrate 1 and the second dielectric substrate 2 is 90° or 180°; a first Huygens antenna 3 and a second Huygens antenna 4 with identical structures are respectively disposed on the first dielectric substrate 1 and the second dielectric substrate 2; a first metal ground plane 5 and a second metal ground plane 6 are respectively disposed on the first dielectric substrate 1 and the second dielectric substrate 2; the first Huygens antenna 3 and the second Huygens antenna 4 are excited by a first coaxial cable 7 and a second coaxial cable 8 respectively; the structures on the first dielectric substrate 1 and the second dielectric substrate 2 are mirror-symmetrical about the intersection line of the two dielectric substrates.

[0030] The distance between the first Huygens antenna 3 and the second Huygens antenna 4 and the intersection line of the first dielectric substrate 1 and the second dielectric substrate 2 is 0.385mm. The two Huygens antennas are placed close together to obtain a higher overall efficiency of the terminal antenna.

[0031] When the first dielectric substrate 1 and the second dielectric substrate 2 are placed at an angle of 90°, the first Huygens antenna 3 and the second Huygens antenna 4 are placed vertically and exhibit dual-polarized radiation; when the first dielectric substrate 1 and the second dielectric substrate 2 are placed at an angle of 180°, the first Huygens antenna 3 and the second Huygens antenna 4 are in the same horizontal plane and exhibit linear-polarized radiation.

[0032] like Figure 3 As shown in a-b, the first Huygens antenna 3 includes an electric dipole 301, a magnetic dipole 302, and an excitation source 303. The electric dipole 301 is attached to the upper surface of the dielectric substrate, and the magnetic dipole 302 is attached to the lower surface of the dielectric substrate. The excitation source 303, which is used to excite a ring current on the magnetic dipole 302, is located below the magnetic dipole 302 and includes two L-shaped metal strips respectively attached to the upper and lower surfaces of the dielectric substrate. The L-shaped metal strip attached to the upper surface of the dielectric substrate is connected to the inner core of the coaxial cable, and the L-shaped metal strip attached to the lower surface of the dielectric substrate is connected to the metal ground plane. This feeding structure has a more stable connection.

[0033] The electric dipole 301 is a rectangular metal strip with U-shaped metal strips loaded at both ends. The length of the rectangular metal strip is l1 = 32.83 mm, and the width is w1 = 0.2 mm. The dimensions of the U-shaped metal strips loaded at both ends are l2 = 6.74 mm and l3 = 3.5 mm. The magnetic dipole 302 is a rectangular ring structure with a slit at the lower end. The length of the rectangular ring structure is l6 = 18.7 mm, and the width is l7 = 6.84 mm. The width of the metal strip at the lower end is w2 = 1.7 mm. The length of the internally hollowed-out rectangle is l8 = 17.1 mm, and the width is... l9 = 3.86 mm, the width of the crack g1 = 2.4 mm; the excitation source 303 is located below the magnetic dipole 302, and includes two L-shaped metal strips respectively attached to the upper and lower surfaces of the dielectric plate. The width of the metal strips w3 = 1 mm, the length of the L-shaped metal strips attached to the upper surface of the dielectric plate in the direction parallel to the electric dipole 301 is l5 = 9.3 mm, the length in the direction parallel to the electric dipole 301 is l4 = 5.36 mm, and the distance between the metal ground plane 5 and the magnetic dipole 302 is g2 = 3.28 mm.

[0034] Reference Figures 1-2 Both the first metal ground plane 5 and the second metal ground plane 6 have a rectangular metal ground plane with a rectangular chamfer and two straight slots. The rectangular chamfer reduces the impact of the large metal ground plane on the radiation performance, and the two straight slots reduce the back radiation of the antenna.

[0035] The rectangular chamfer 51 has a length of 54mm and a width of 31mm.

[0036] The length of the first straight groove 501 and the second straight groove 502 is 29mm and the width is 2mm. The length of the first straight groove 501 and the second straight groove 502 is slightly smaller than the width of the metal ground plate to ensure the connection of the mobile phone metal ground plate.

[0037] This invention utilizes the high efficiency and low back radiation characteristics of Huygens antennas and introduces them into mobile phone antennas. The excitation source is set as two L-shaped metal strips, which are respectively attached to the upper and lower surfaces of the dielectric substrate. One L-shaped metal strip is connected to the inner core of the coaxial cable, and the other L-shaped metal strip is connected to the metal ground plane. This feeding method is more stable. A metal ground plane required by mobile phones is added below the traditional Huygens antenna without a ground plane, and the metal ground plane is modified so that the Huygens antenna still maintains the advantages of high efficiency and low back radiation in mobile phones, thereby improving the satellite communication experience for users of foldable screen mobile phones.

[0038] The design concept of this invention is as follows: by adjusting the effective electrical dimensions of the electric dipole 301 and the magnetic dipole 302 to make them work in λ / 2 mode, and by adjusting the distance between the excitation source 303 and the magnetic dipole 302, and the relative positions of the electric dipole 301 and the magnetic dipole 302, the Huygens antenna 3 can achieve Huygens cardioid radiation.

[0039] Adjusting the distance between the first Huygens antenna 3 and the second Huygens antenna 4 and the intersection line of the first dielectric substrate 1 and the second dielectric substrate 2, so that the two Huygens antennas are placed close together, the high radiation efficiency of the Huygens antenna itself and the placement of the two Huygens antennas result in the terminal antenna having high overall efficiency when the angle between the two dielectric substrates is 90° and 180°.

[0040] The rectangular metal ground plane is chamfered at the corners and two straight grooves are added. The length of the chamfer 51 is 54mm and the width is 31mm. The length of the straight grooves 501 and 502 is 29mm and the width is 2mm, forming the structure of the first metal ground plane 5 and the second metal ground plane 6. This concentrates the radiated energy in the upper space, which not only improves the stability of the communication connection between the mobile phone and the satellite, but also reduces the impact of back radiation on human health.

[0041] The present invention enables the antenna to operate at any frequency by adjusting the effective electrical dimensions of the electric dipole 301 and the magnetic dipole 302.

[0042] In this invention, the first Huygens antenna 3 and the second Huygens antenna 4 are placed close together in a horizontal position to obtain a higher overall efficiency of the terminal antenna.

[0043] This invention adds a metal ground plane required for mobile phone antennas below the traditional groundless first Huygens antenna 3 and second Huygens antenna 4, and performs rectangular chamfering and adds two straight slots to the rectangular metal ground plane, so that the radiated energy is concentrated in the upper half space, which can establish a stable communication connection and reduce the impact of antenna radiation on human health.

[0044] When the first dielectric substrate 1 and the second dielectric substrate 2 are placed at an angle of 90°, the terminal antenna radiates in a dual-polarized manner; when the first dielectric substrate 1 and the second dielectric substrate 2 are placed at an angle of 180°, the terminal antenna radiates in a linearly polarized manner. Both operating states maintain high efficiency and low back radiation.

[0045] like Figures 4-5 As shown, the mobile phone antenna based on the improved Huygens antenna has a |S11| of less than -6dB at the port when the included angle between the two dielectric substrates is 90° and 180°, within the target frequency band of 2.48-2.5GHz.

[0046] like Figure 6As shown, the mobile phone antenna based on the improved Huygens antenna has a total efficiency of 87.51% to 91.34% in the target frequency band of 2.48-2.5GHz when the included angle between the two dielectric substrates is 90°.

[0047] like Figure 6 As shown, the mobile phone antenna based on the improved Huygens antenna has a total efficiency of 90.58% to 94.24% in the target frequency band of 2.48-2.5GHz when the included angle between the two dielectric substrates is 180°.

[0048] like Figure 7 As shown in (a) to (b), the radiation pattern of the mobile phone antenna based on the improved Huygens antenna at a frequency of 2.49 GHz is shown when the angle between the two dielectric substrates is 90°, with a gain of 3.6 dBi. Figure 7 (a) shows the radiation pattern of the XOZ plane. Figure 7 (b) shows the radiation pattern in the YOZ plane, where the terminal antenna exhibits dual-polarized radiation. The radiation pattern has a large beamwidth and low back radiation in the upper half-space.

[0049] like Figure 8 As shown in (a) to (b), the radiation pattern of the mobile phone antenna based on the improved Huygens antenna at a frequency of 2.49 GHz is shown when the angle between the two dielectric substrates is 180°, with a gain of 3.2 dBi. Figure 7 (a) shows the E-plane radiation pattern at this frequency. Figure 7 (b) is the H-plane radiation pattern at this frequency. At this time, the terminal antenna exhibits linear polarization radiation, and the main polarization radiation has a large beamwidth and low back radiation in the upper half space.

Claims

1. A mobile phone antenna based on an improved Huygens antenna, characterized in that, include: A first dielectric substrate (1) and a second dielectric substrate (2) are provided, with the angle between the first dielectric substrate (1) and the second dielectric substrate (2) being 90° or 180°; a first Huygens antenna (3) and a second Huygens antenna (4) with identical structures are respectively disposed on the first dielectric substrate (1) and the second dielectric substrate (2); a first metal ground plane (5) and a second metal ground plane (6) are respectively provided on the first dielectric substrate (1) and the second dielectric substrate (2); the first Huygens antenna (3) and the second Huygens antenna (4) are excited by a first coaxial cable (7) and a second coaxial cable (8) respectively; the structures on the first dielectric substrate (1) and the second dielectric substrate (2) are mirror-symmetrical about the intersection line of the two dielectric substrates; The first Huygens antenna (3) includes an electric dipole (301), a magnetic dipole (302), and an excitation source (303). The electric dipole (301) is attached to the upper surface of the first dielectric substrate (1), and the magnetic dipole (302) is attached to the lower surface of the first dielectric substrate (1). The excitation source (303) is located on one side of the magnetic dipole (302), and the excitation source (303) is used to excite a ring current on the magnetic dipole (302). The excitation source (303) includes L-shaped metal strips respectively attached to the upper and lower surfaces of the first dielectric substrate (1). The L-shaped metal strip attached to the upper surface of the first dielectric substrate (1) is connected to the inner core of the coaxial cable, and the L-shaped metal strip attached to the lower surface of the first dielectric substrate (1) is connected to the metal ground plane. The electric dipole (301) is a rectangular metal strip with U-shaped metal strips loaded at both ends; The magnetic dipole (302) has a rectangular ring structure.

2. The mobile phone antenna based on the improved Huygens antenna according to claim 1, characterized in that, The second metal ground plane (6) has the same structure as the first metal ground plane (5). The first metal ground plane (5) has a rectangular chamfer (51). The rectangular chamfer (51) is located in a position that is not connected to the second metal ground plane (6) and is close to the first Huygens antenna (3). The first metal ground plane (5) is provided with two parallel straight grooves, namely the first straight groove (501) and the second straight groove (502).

3. The mobile phone antenna based on the improved Huygens antenna according to claim 2, characterized in that, The rectangular chamfer (51) has a length of 54mm and a width of 31mm, and the first straight groove (501) and the second straight groove (502) have a length of 29mm and a width of 2mm.

4. The mobile phone antenna based on the improved Huygens antenna according to claim 1, characterized in that, The distance between the first Huygens antenna (3) and the second Huygens antenna (4) and the line of intersection of the first dielectric substrate (1) and the second dielectric substrate (2) is 0.385 mm.

Images