Mobile phone antenna based on improved Huygens antenna

Abstract

The invention discloses a mobile phone antenna based on an improved Huygens antenna, which is characterized in that a traditional Huygens antenna is placed at the top of a dielectric substrate, and the Huygens antennas on the two dielectric substrates are close to each other; modifying the shape of the metal grounding plate; 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. According to the mobile phone antenna, a traditional no-floor Huygens antenna is introduced into mobile phone antenna application, the metal grounding plate required by a mobile phone is added below the traditional no-floor Huygens antenna, and the metal grounding plate is modified, so that the terminal antenna has the advantages of high efficiency and low backward radiation, and the feed structure is more stable; and radiation energy is concentrated in the upper half space, so that the stability of communication connection between the mobile phone and the satellite is further enhanced, and the satellite communication experience of a user of the double-folding mobile phone is improved.

Description

Technical Field

[0001] The present invention belongs to the field of wireless satellite communication and antenna technology, and specifically is a mobile phone antenna based on an improved Huygens antenna, which can be used for a dual-folding screen mobile phone. Background Art

[0002] With the continuous development of smart phones, foldable screen phones are gradually becoming popular among users, but the research on antennas in foldable screen phones is still relatively limited; the satellite communication function of mobile phones allows users to still communicate with the outside world in areas where ground communication base station signals cannot cover, such as deserts, mountains, and oceans, so this function has been favored by users. At present, the satellite communication frequency bands used by mobile terminals are more often S bands, that is, the 1980-2100 / 2170-2200MHz uplink and downlink frequency bands with a bandwidth of 30MHz and the 2483.5-2500MHz downlink frequency band with a bandwidth of 16.5MHz.

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

[0004] The purpose of the present invention is to propose a mobile phone antenna based on an improved Huygens antenna, which 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. The antenna has the characteristics of high efficiency and low backward radiation.

[0005] The technical solution for achieving the purpose of the present invention is: 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 completely identical structures are respectively arranged 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 grounding plate and a second metal grounding plate; the first Huygens antenna and the second Huygens antenna are respectively excited by a first coaxial cable and a second coaxial cable; and 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, the excitation source is located on one side of the magnetic dipole, and the excitation source is used to excite a circular 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 grounding plate.

[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 plate has the same structure as the first metal ground plate, the first metal ground plate has a rectangular cut corner, and the rectangular cut corner is located at a position not connected to the second metal ground plate and close to the first Huygens antenna; the first metal ground plate is provided with two parallel straight grooves.

[0011] Preferably, the rectangular cut corner has a length of 54 mm and a width of 31 mm, and the first straight line groove and the second straight line groove have a length of 29 mm and a width of 2 mm.

[0012] Preferably, the distance between the first Huygens antenna and the second Huygens antenna and the intersection line of the first dielectric substrate and the second dielectric substrate is 0.385 mm.

[0013] Compared with the prior art, the present invention has the following significant advantages:

[0014] 1. The present invention introduces the Huygens antenna into the design of the folding screen mobile phone antenna and reasonably places the positions of the two Huygens antennas to obtain a higher total terminal antenna efficiency;

[0015] 2. The present invention adds a floor required by a mobile phone under a traditional Huygens antenna without a floor and modifies the floor to realize the application of the Huygens antenna in a mobile phone, while still having the advantages of high efficiency and low backward radiation;

[0016] 3. The excitation source of the traditional Huygens antenna needs to be directly connected to the inner and outer conductors of the coaxial cable in the form of 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 plate. 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 plate, so that the feeding structure is more stable;

[0017] 4. The antenna design provided by the present invention is simple to implement, and the terminal antenna can be made to work at any frequency by adjusting the effective electrical size of the Huygens antenna, which has universal applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural diagram of a mobile phone antenna based on an improved Huygens antenna proposed by the present invention when the angle between the two dielectric substrates is 90°.

[0019] Figure 2 It is a structural diagram of a mobile phone antenna based on an improved Huygens antenna proposed by the present invention when the 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 by the present invention. Figure 3 (a) is the surface structure of the dielectric plate. Figure 3 (b) is the structure on the lower surface of the dielectric plate. 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 It is a port S parameter diagram of a mobile phone antenna based on an improved Huygens antenna proposed by the present invention when the included angle between the two dielectric substrates is 90°.

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

[0023] Figure 6 This is a total efficiency diagram of a mobile phone antenna based on an improved Huygens antenna proposed by the present invention.

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

[0025] Figure 8 The present invention proposes a radiation pattern at a frequency of 2.49 GHz when the angle between the two dielectric substrates of a mobile phone antenna based on an improved Huygens antenna is 180°. Figure 7 (a) is the E-plane radiation pattern at this frequency, Figure 7 (b) is the H-plane radiation pattern at this frequency. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0027] First of all, it should be stated that in the description of this application, the terms "horizontal", "vertical", "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0028] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0029] like Figures 1-2 As shown, the mobile phone antenna based on the improved Huygens antenna comprises: 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 completely identical structures are respectively arranged on the first dielectric substrate 1 and the second dielectric substrate 2, wherein the first dielectric substrate 1 and the second dielectric substrate 2 are respectively provided with a first metal grounding plate 5 and a second metal grounding plate 6; the first Huygens antenna 3 and the second Huygens antenna 4 are respectively excited by a first coaxial cable 7 and a second coaxial cable 8; and 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 0.385 mm, and the two Huygens antennas are placed close to each other to obtain a higher total efficiency of the terminal antenna.

[0031] When the angle between the first dielectric substrate 1 and the second dielectric substrate 2 is 90°, the first Huygens antenna 3 and the second Huygens antenna 4 are placed vertically and radiate in dual-polarization; when the angle between the first dielectric substrate 1 and the second dielectric substrate 2 is 180°, the first Huygens antenna 3 and the second Huygens antenna 4 are in the same horizontal plane and radiate in linear polarization.

[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 for exciting a circular current on the magnetic dipole 302 is located below the magnetic dipole 302, and includes two L-shaped metal strips attached to the upper and lower surfaces of the dielectric plate, respectively. The L-shaped metal strip attached to the upper surface of the dielectric plate is connected to the inner core of the coaxial cable, and the L-shaped metal strip attached to the lower surface of the dielectric plate is connected to the metal ground plate. The feeding structure connection is more stable.

[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 l 1 =32.83mm, width w 1 =0.2mm, the size of the U-shaped metal strip loaded at both ends is l 2 =6.74mm, l 3 =3.5mm; the magnetic dipole 302 is a rectangular ring structure, the lower end of the rectangular ring structure is provided with a crack, the length of the rectangular ring structure l 6 =18.7mm, width l 7 =6.84mm, the width of the lower metal strip w 2 =1.7mm, the length of the hollowed-out rectangle is l 8 =17.1mm, width l 9 =3.86mm, the width of the crack g 1 =2.4mm; the excitation source 303 is located below the magnetic dipole 302, and includes two L-shaped metal strips attached to the upper and lower surfaces of the dielectric plate, respectively, and the width of the metal strips is w 3 =1mm, the length of the L-shaped metal strip attached to the upper surface of the dielectric plate in the direction parallel to the electric dipole 301 is l 5 =9.3mm, and the length in the direction parallel to the electric dipole 301 is l 4 =5.36mm, the distance g between the metal ground plate 5 and the magnetic dipole 302 2 =3.28mm.

[0034] Reference Figures 1-2 The first metal ground plate 5 and the second metal ground plate 6 both have a rectangular metal ground plate with a rectangular cut corner and two straight grooves. The rectangular cut corner reduces the influence of the large metal ground plate on the radiation performance, and the two straight grooves reduce the backward radiation of the antenna.

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

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

[0037] The present invention utilizes the characteristics of high efficiency and low backward radiation of the Huygens antenna and introduces it into the mobile phone antenna. The excitation source is set as two L-shaped metal strips and 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 plate. The feeding method is more stable. The metal ground plate required by the mobile phone is added under the traditional Huygens antenna without a floor, and the metal ground plate is modified so that the Huygens antenna still maintains the advantages of high efficiency and low backward radiation in the mobile phone, thereby improving the satellite communication experience of users of folding screen mobile phones.

[0038] The design idea of ​​the present invention is: by adjusting the effective electric size of the electric dipole 301 and the magnetic dipole 302 to make them work in the λ / 2 mode, adjusting the distance between the excitation source 303 and the magnetic dipole 302, and the relative position of the electric dipole 301 and the magnetic dipole 302, the Huygens antenna 3 can realize the Huygens cardioid radiation;

[0039] The distances 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 are adjusted so that the two Huygens antennas are placed close to each other. The high radiation efficiency of the Huygens antenna itself and the placement of the two Huygens antennas enable the terminal antenna to have a higher total efficiency when the angles between the two dielectric substrates are 90° and 180°.

[0040] The rectangular metal grounding plate is cut into rectangular corners and two straight grooves are added. The length of the rectangular cut corner 51 is 54 mm and the width is 31 mm. The length of the straight grooves 501502 is 29 mm and the width is 2 mm. The structure of the first metal grounding plate 3 and the second metal grounding plate 4 is formed, which concentrates the radiation energy in the upper half space, thereby improving the stability of the communication connection between the mobile phone and the satellite and reducing the impact of backward radiation on human health.

[0041] The present invention can make the antenna work at any frequency by adjusting the effective electric dimensions of the electric dipole 301 and the magnetic dipole 302 .

[0042] In the present invention, the first Huygens antenna 3 and the second Huygens antenna 4 are placed closely in a horizontal position to obtain a higher total efficiency of the terminal antenna.

[0043] The present invention adds a metal grounding plate required for a mobile phone antenna under the first Huygens antenna 3 and the second Huygens antenna 4 without a traditional floor, and performs rectangular corner cutting and adds two straight grooves on the rectangular metal grounding plate, so that the radiation energy is concentrated in the upper half space, which can not only establish a stable communication connection, but also reduce the impact of antenna radiation on human health.

[0044] In the present invention, when the first dielectric substrate 1 and the second dielectric substrate 2 are placed at an angle of 90°, the terminal antenna is dual-polarized radiation, and when the first dielectric substrate 1 and the second dielectric substrate 2 are placed at an angle of 180°, the terminal antenna is linearly polarized radiation, and high efficiency and low backward radiation are maintained in both working states.

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

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

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

[0048] like Figure 7 As shown in (a) to (b), the mobile phone antenna based on the improved Huygens antenna has a radiation pattern at a frequency of 2.49 GHz when the angle between the two dielectric substrates is 90°, and the gain value is 3.6 dBi. Figure 7 (a) is the radiation pattern of the XOZ plane, Figure 7 (b) is the radiation pattern of the YOZ plane. At this time, the terminal antenna radiates in dual polarization, and the radiation pattern has a larger beam width and lower backward radiation in the upper half space.

[0049] like Figure 8 As shown in (a) to (b), the mobile phone antenna based on the improved Huygens antenna has a radiation pattern at a frequency of 2.49 GHz when the angle between the two dielectric substrates is 180°, and the gain value is 3.2 dBi. Figure 7 (a) is 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 radiates linearly polarized radiation, and the main polarization radiation has a larger beam width and lower backward 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), 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 completely identical structures are respectively arranged on the first dielectric substrate (1) and the second dielectric substrate (2); a first metal grounding plate (5) and a second metal grounding plate (6) are respectively arranged on the first dielectric substrate (1) and the second dielectric substrate (2); the first Huygens antenna (3) and the second Huygens antenna (4) are respectively excited by a first coaxial cable (7) and a second coaxial cable (8); and 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.

2. The mobile phone antenna based on the improved Huygens antenna according to claim 1, characterized in that: The first Huygens antenna (3) comprises 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); 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 circular current on the magnetic dipole (302).

3. The mobile phone antenna based on the improved Huygens antenna according to claim 2, characterized in that: The excitation source (303) comprises 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 a metal grounding plate.

4. The mobile phone antenna based on the improved Huygens antenna according to claim 2, characterized in that: The electric dipole (301) is a rectangular metal strip with U-shaped metal strips loaded at both ends.

5. The mobile phone antenna based on the improved Huygens antenna according to claim 2, characterized in that: The magnetic dipole (302) is a rectangular ring structure.

6. The mobile phone antenna based on the improved Huygens antenna according to claim 1, characterized in that: The second metal grounding plate (6) has the same structure as the first metal grounding plate (5); the first metal grounding plate (5) has a rectangular cut corner (51), and the rectangular cut corner (51) is located at a position not connected to the second metal grounding plate (6) and close to the first Huygens antenna (3); the first metal grounding plate (5) is provided with two parallel straight grooves (501).

7. The mobile phone antenna based on the improved Huygens antenna according to claim 6, characterized in that: The rectangular cut corner (51) has a length of 54 mm and a width of 31 mm, and the first straight groove (501) and the second straight groove (502) have a length of 29 mm and a width of 2 mm.

8. 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 intersection line of the first dielectric substrate (1) and the second dielectric substrate (2) is 0.385 mm.

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