Circularly polarized antenna for metal frame intelligent terminal satellite communication and intelligent terminal

Abstract

The invention discloses a circularly polarized antenna for metal frame intelligent terminal satellite communication and an intelligent terminal. The circularly polarized antenna comprises a metal frame and a dielectric substrate arranged in the metal frame; metal floors are arranged on the two sides of the dielectric substrate, and the metal floors on the two sides of the dielectric substrate are electrically connected through metalized through holes; a gap is formed in the top of the metal frame and partitions the metal frame; one end, close to the gap, of the dielectric substrate is not covered with the metal floor and forms a hollow opening; the metalized through hole surrounds one end, close to the gap, of the dielectric substrate and is combined with the hollow opening to form a magnetic dipole; the two metal floors at the magnetic dipole are respectively connected with the two separated connecting ends in the metal frame through two parallel feeder lines; and the feed port is arranged on one side, close to the feed line, in the cavity. The antenna is based on a specific design structure, is easy to process, is low in cost, also has the advantages of a metal frame, a single-layer structure, an end-fire circular polarization wave beam and the like, and is excellent in practical application effect.

Description

Technical Field

[0001] The present application relates to the technical field of wireless communication equipment, and in particular to a circularly polarized antenna and a smart terminal for satellite communication of a metal-framed smart terminal. Background Art

[0002] With the rapid development of intelligent communication technology, satellite communication in small intelligent terminals (such as mobile phones, satellite phones, etc.) has become an important function that needs to be developed urgently, which has also effectively expanded the coverage of communication services. This function allows users to have seamless communication services with the outside world in remote mountainous areas and areas without cellular network coverage such as the sea. In satellite communication services, circular polarization (CP) antennas are particularly special because circular polarization antennas are insensitive to the polarization mode of signal transmission and reception. Therefore, circular polarization is generally used as the polarization mode of signals in satellite communications. In addition, the distance between the satellite and the terminal is long, which inevitably leads to a large amount of signal attenuation. Therefore, in practical applications, it is particularly important to align the transmitting beam direction of the mobile terminal with the receiving beam direction of the satellite. In order to achieve these functions, the antenna must have the characteristics of beam directional radiation and circular polarization.

[0003] Nowadays, smart terminal antennas are usually designed based on metal frames, because metal frames can bring better user experience and increase the aesthetics of smart terminals. However, metal frames also bring some problems that cannot be ignored. The most important point is that the existence of the metal frame will reflect or couple with the electromagnetic waves radiated by the antenna on the terminal motherboard, which greatly deteriorates the radiation performance of the entire terminal antenna. Therefore, metal frames and directional radiation are usually not taken into account at the same time. In other words, directional circularly polarized beams cannot directly pass through the metal frame and maintain the original directional radiation characteristics. In recent years, a number of directional circularly polarized antennas for smart terminals have been reported. End-fire circular polarization can be achieved by coupling and feeding the ring antenna, differentially fed circularly polarized antennas based on narrow cross dipoles, and reconfigurable directional circularly polarized antennas can be achieved by combining folding smart terminals, but these antennas cannot be applied to metal frames. There are also some dual-frequency circularly polarized microstrip antennas that can be used for smart terminals. The circularly polarized radiation direction of this type of antenna is pointing to the normal direction of the plane of the smart terminal, so it is not suitable for mobile terminal satellite communications with end-fire circular polarization characteristics.

[0004] In order to realize end-fire circular polarization in smart terminals with extremely limited space, it is necessary to introduce end-fire circular polarization antennas with lower profiles, among which complementary dipole antennas are widely used. A magnetic dipole is formed by the establishment of a metal cavity, and another electric dipole is parallel to the plane of the cavity. A section of two parallel lines corresponding to the corresponding amplitude and phase difference is introduced between the magnetic dipole and the electric dipole, thereby realizing planar end-fire circular polarization. However, the antenna size in the current technology is too large, and the ground clearance is 25.6mm. Therefore, in order to further reduce the size, the two parallel lines are bent to achieve end-fire circular polarization in areas with limited space. However, this type of complementary dipole antenna cannot be used in terminals with metal frames because it is limited by the metal frame and deteriorates the directional radiation characteristics and circular polarization characteristics of the antenna.

[0005] Therefore, the complementary dipole antenna used for satellite communication in the prior art method has the problem that it cannot be applied to metal frame terminals. Summary of the invention

[0006] The embodiments of the present application provide a circularly polarized antenna and a smart terminal for satellite communications of a metal-framed smart terminal, aiming to solve the problem that the complementary dipole antenna used for satellite communications in the prior art methods cannot be applied to metal-framed terminals.

[0007] In a first aspect, an embodiment of the present application provides a circularly polarized antenna for satellite communication of a metal frame intelligent terminal, which includes a metal frame and a dielectric substrate disposed in the metal frame;

[0008] Metal floors are provided on both sides of the dielectric substrate, and the metal floors on both sides of the dielectric substrate are electrically connected through metallized through holes; a gap is provided on the top of the metal frame, and the gap separates the metal frame;

[0009] One end of the dielectric substrate close to the gap is not covered with a metal floor and forms a hollow opening; the metallized through hole surrounds the end of the dielectric substrate close to the gap to form a semi-enclosed cavity, and the cavity and the hollow opening are combined to form a magnetic dipole; the two metal floors at the magnetic dipole are respectively connected to the connection ends located on both sides of the gap in the metal frame through two parallel serpentine feed lines; the metal frame is also provided with a long strip through groove parallel to the dielectric substrate; the long strip through groove intersects the gap vertically; a coaxial feeding terminal is arranged at the feeding port of the dielectric substrate and is respectively connected to the two metal floors, and the feeding port is arranged on one side of the cavity close to the feed line.

[0010] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the diameter of the metallized through hole is 0.5-3 mm, and the spacing between the edges of adjacent metallized through holes is 1 / 3-1 / 2 of the diameter of the metallized through hole.

[0011] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the metallized through holes are arranged in a rectangular frame shape and enclosed with the hollow opening to form a cavity with a rectangular structure.

[0012] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the length of the cavity of the rectangular structure is 5 / 7-3 / 4 of the width of the metal frame, and the width of the cavity is 2 / 7-1 / 3 of the length of the cavity.

[0013] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the distance between the feeding port and a side of the cavity away from the feeder line is 2 / 3-5 / 7 of the width of the cavity.

[0014] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the bent portion of the feeder is subjected to angle cutting.

[0015] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the height of the metal frame is 5-10 mm, and the thickness of the dielectric substrate is 1 / 10-1 / 8 of the height of the metal frame.

[0016] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the length of the elongated through slot is 1 / 2-2 / 3 of the width of the metal frame.

[0017] The circularly polarized antenna for satellite communication of a metal-framed intelligent terminal, wherein the width of the slot is 1 / 2-3 / 5 of the width of the long strip through slot.

[0018] In the second aspect, an embodiment of the present application also provides a smart terminal, wherein the smart terminal includes a communication circuit and a circularly polarized antenna for satellite communication of a metal-frame smart terminal as described in the first aspect above; the communication circuit is electrically connected to the coaxial feed terminal to realize the transmission and reception of antenna signals.

[0019] The embodiment of the present application provides a circularly polarized antenna and a smart terminal for satellite communication of a metal frame smart terminal, the circularly polarized antenna comprising a metal frame and a dielectric substrate arranged in the metal frame; metal floors are arranged on both sides of the dielectric substrate, and the metal floors on both sides of the dielectric substrate are electrically connected through metallized through holes; a gap is arranged on the top of the metal frame, and the gap separates the metal frame; the end of the dielectric substrate close to the gap does not cover the metal floor and forms a hollow opening; the metallized through hole surrounds the end of the dielectric substrate close to the gap and combines with the hollow opening to form a magnetic dipole; the two metal floors at the magnetic dipole are respectively connected to the two separated connection ends in the metal frame through two parallel feed lines; the feed port is arranged on one side of the cavity close to the feed line. The above antenna is optimized and improved based on complementary dipoles, a magnetic dipole is formed by a cavity formed by metallized through holes, and phase compensation is performed by two bent parallel feed lines, the end of the feed line is directly connected to the metal frame, and the top metal frame with a cross-shaped gap acts as an electric dipole, and finally a good end-fire circular polarization characteristic is achieved under the metal frame. The disclosed antenna is easy to process and has low cost, and also has the advantages of a metal frame, a single-layer structure, and an end-fire circularly polarized beam, and has a good application effect in a mobile terminal with a satellite communication function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A front structural diagram of a circularly polarized antenna for satellite communication of a metal-framed smart terminal provided in an embodiment of the present application;

[0022] Figure 2 Provided for the embodiments of this application Figure 1 The local structure diagram of the middle A area;

[0023] Figure 3 A partial structural diagram of a circularly polarized antenna for satellite communication of a metal-framed intelligent terminal provided in an embodiment of the present application;

[0024] Figure 4 Another partial structural diagram of the circularly polarized antenna for satellite communication of a metal frame intelligent terminal provided in an embodiment of the present application;

[0025] Figure 5 Another partial structural diagram of a circularly polarized antenna for satellite communication of a metal-framed intelligent terminal provided in an embodiment of the present application;

[0026] Figure 6 A cross-sectional structural diagram of a circularly polarized antenna for satellite communications of a metal-framed smart terminal provided in an embodiment of the present application;

[0027] Figure 7 Provided for the embodiments of this application Figure 5 The local structure diagram of the middle B area;

[0028] Figure 8 A schematic diagram of the effect of a circularly polarized antenna for satellite communication of a metal-framed smart terminal provided in an embodiment of the present application;

[0029] Fig. 9 A schematic diagram of the effect of a circularly polarized antenna for satellite communication of a metal-framed smart terminal provided in an embodiment of the present application;

[0030] Fig.10 A schematic diagram of the effect of a circularly polarized antenna for satellite communication of a metal-framed smart terminal provided in an embodiment of the present application;

[0031] Fig.11 A schematic diagram of the effect of a circularly polarized antenna for satellite communication of a metal-framed smart terminal provided in an embodiment of the present application.

[0032] Reference numerals: 1. metal frame; 2. dielectric substrate; 21. metal floor; 22. metallized through hole; 11. gap; 3. feed line; 12. long strip through slot; 4. coaxial feed terminal; 41. feed port. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0035] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0036] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0037] See also Figure 1 As shown in the figure, the embodiment of the present application discloses a circularly polarized antenna for satellite communication of a metal frame intelligent terminal, comprising a metal frame 1 and a dielectric substrate 2 arranged in the metal frame 1; metal floors 21 are arranged on both sides of the dielectric substrate 2, and the metal floors 21 on both sides of the dielectric substrate 2 are electrically connected through metallized through holes 22; a gap 11 is arranged on the top of the metal frame 1, and the gap 11 separates the metal frame 1; an end of the dielectric substrate 2 close to the gap 11 is not covered with the metal floor 21 and forms a hollow opening; the metallized through hole 22 is located at the dielectric substrate 2 close to the gap 11 One end of the dielectric substrate 2 is surrounded to form a semi-enclosed cavity, and the cavity and the hollow opening are combined to form a magnetic dipole; the two metal floors 21 at the magnetic dipole are respectively connected to the connection ends on both sides of the gap 11 in the metal frame 1 through two parallel serpentine feed lines 3; the metal frame 1 is also provided with a long strip through groove 12 parallel to the dielectric substrate 2; the long strip through groove 12 intersects the gap 11 vertically; the coaxial feeding terminal 4 is arranged at the feeding port 41 of the dielectric substrate 2 and is respectively connected to the two metal floors 21, and the feeding port 41 is arranged on one side of the cavity close to the feed line 3.

[0038] The circularly polarized antenna disclosed in this application mainly includes two parts: a dielectric substrate 2 and a metal frame 1. Its planar design structure is as follows: Figure 1 As shown. Both sides of the dielectric substrate 2 are metal floors 21 of the PCB, and metallized through holes 22 are designed in the dielectric substrate 2 to connect the metal floors 21 on both sides; the metallized through holes 22 are used to enclose a semi-enclosed cavity on one side of the hollow opening, thereby forming an equivalent magnetic dipole at the hollow opening; wherein the diameter of the metallized through hole 22 is R1, and the distance between the edges of two adjacent metallized through holes 22 is G4, and the specific dimensions are as follows: Figure 1 The enlarged view of the circled part is shown in the figure.

[0039] The metal floor 21 at the magnetic dipole is connected to the two connection ends formed by the partition in the metal frame 1 through two feed lines 3 respectively. The feed line 3 is set to be serpentine. The U-shaped bending structure formed on both sides of the feed line 3 has the same width except for the connection with the metal frame 1. The U-shaped bending structure formed on both sides of the feed line 3 can be used to generate the required phase lag relative to the cavity magnetic dipole. The size of the feed line 3 is marked as follows: Figure 2 shown.

[0040] The metal frame 1 is grooved only at the top near the hollow opening. The longitudinal slit 11 directly passes through the entire frame, and the transverse long strip through slot 12 intersects the slit 11 vertically. The length of the long strip through slot 12 is L5. The specific structure of the feed line 3 for phase compensation connected to the two connection ends of the top metal frame 1 is as follows: Figure 5 and Figure 7 The upper and lower ends of the two parallel feed lines 3 are respectively connected to a connection end of the metal frame 1 and the corresponding metal floor 21. The dielectric substrate 2 can be Rogers 4350B (ε r =3.66 and tanδ=0.0037), the dielectric substrate 2 is used as the substrate, and its thickness is H2.

[0041] Specifically, the diameter R1 of the metallized through hole 22 is 0.5-3 mm, and in a preferred embodiment, the diameter R1 of the metallized through hole 22 can be set to 0.8-1.2 mm, and the spacing G4 between the edges of adjacent metallized through holes 22 is 1 / 3-1 / 2 of the diameter R1 of the metallized through hole 22. The metallized through holes 22 are arranged in a rectangular frame shape and enclosed with the hollow opening to form a rectangular cavity. Furthermore, the length L2 of the rectangular cavity is 5 / 7-3 / 4 of the width W1 of the metal frame, and the width W2 of the cavity is 2 / 7-1 / 3 of the length L2 of the cavity.

[0042] like Figure 1 As shown, the metallized through holes 22 can be arranged in a rectangular frame shape to form a semi-enclosed structure. The metallized through holes 22 and the hollow openings are enclosed to form a cavity with a rectangular structure. To improve the feeding effect, the length L2 of the cavity can be set to 5 / 7-3 / 4 of the width W1 of the metal frame 1, and the width W2 of the cavity can be set to 2 / 7-1 / 3 of the length L2 of the cavity.

[0043] In a more specific embodiment, a distance L4 between the feeding port 41 and a side of the cavity away from the feeding line is 2 / 3-5 / 7 of the width W2 of the cavity.

[0044] The feeding port 41 is located on one side of the cavity near the feed line 3. The change of the feeding position corresponding to the feeding port 41 directly affects the impedance matching. The feeding port 41 is electrically connected to the coaxial feeding terminal 4. The coaxial feeding terminal 4 includes a coaxial internal terminal line and an external terminal line. The specific setting structure is as follows: Figure 3 and Figure 4 shown.

[0045] Specifically, the bending portion of the feed line 3 is chamfered. The bending portion of the transmission line is chamfered to reduce the loss on the transmission line, thereby improving the radiation efficiency.

[0046] In a more specific embodiment, the height H1 of the metal frame 1 is 5-10 mm, and the thickness H2 of the dielectric substrate 2 is 1 / 10-1 / 8 of the height H1 of the metal frame 1. The length L5 of the long strip through groove 12 is 1 / 2-2 / 3 of the width W1 of the metal frame 1. Furthermore, the width S2 of the gap 11 is 1 / 2-3 / 5 of the width S1 of the long strip through groove 12.

[0047] Furthermore, the gap 11 and the long strip through slot 12 are combined to form a cross gap, and the specific dimensions of the cross gap are marked as follows: Figure 6 The specific design values ​​of each dimension are shown in Table 1:

[0048] Table 1 (dimensions in mm)

[0049] <![CDATA[L1]]> <![CDATA[L2]]> <![CDATA[L3]]> <![CDATA[L4]]> <![CDATA[L5]]> <![CDATA[L6]]> <![CDATA[W1]]> 152 56.5 16.4 11.5 47 0.2 77 <![CDATA[W2]]> <![CDATA[W3]]> <![CDATA[W4]]> <![CDATA[G1]]> <![CDATA[G2]]> <![CDATA[G3]]> <![CDATA[G4]]> 16.5 0.4 0.3 0.3 0.3 0.6 0.5 <![CDATA[G5]]> <![CDATA[G6]]> <![CDATA[R1]]> <![CDATA[H1]]> <![CDATA[H2]]> <![CDATA[S1]]> <![CDATA[S2]]> 1 2.7 1 6.5 0.762 0.7 0.4

[0050] Among them, L1 is the length of the metal frame, L3 is the length of the middle microstrip line in the serpentine feeder, L6 is the horizontal width of the connection between the feeder and the connection end, W3 is the width of the feeder, W4 is the vertical width of the connection between the feeder and the connection end, G1 is the distance between the bottom of the feeder and the metal floor, G2 is the distance between the bottom microstrip line and the middle microstrip line in the feeder, G3 is the distance between the top of the feeder and the metal frame, G5 is the thickness of the vertical side panel in the metal frame, and G6 is the gap value of the hollow opening (the distance between the metal floor and the top metal frame).

[0051] The embodiment of the present application simulates and verifies the end-fire circularly polarized mobile phone antenna. The reflection coefficient of the antenna is as follows: Figure 8 As shown in the figure, its reflection coefficient is less than -10dB in the range of 2482 to 2508MHz, which completely covers the S band (2483.5 to 2500MHz) used for receiving Beidou navigation satellite signals. Axial ratio (AR) is usually used to describe the polarization purity of a circularly polarized antenna. It is generally believed that an axial ratio lower than 3dB indicates that the circular polarization purity of the antenna is high. The axial ratio test results of the antenna in this application are shown in Fig. 9 The end-fire direction (+y direction) axial ratio is less than 3dB in the range of 2457-2516MHz, which also covers the S band used for Beidou navigation satellite signal reception.

[0052] The total radiation efficiency (Total Efficiency) of the end-fire circularly polarized mobile satellite antenna is as follows Fig.10 As shown in the figure, it can be seen that the total efficiency of the antenna in the entire working frequency band is greater than 47%.

[0053] Since the receiving frequency band of the Beidou satellite navigation system uses right-hand circular polarization to receive signals from mobile terminals on the ground, the antenna also works in a right-hand circular polarization mode as the main polarization, and left-hand circular polarization as the cross polarization. The directional pattern of the end-fire circularly polarized antenna disclosed in this application is as follows: Fig.11 As shown, Fig.11 Figure (a) shows the radiation intensity of the antenna in the xy plane and yz plane at a frequency of 2483.5MHz. Fig.11 Figure (b) shows the radiation intensity of the antenna in the xy plane and yz plane at a frequency of 2491MHz. Fig.11 Figure (c) shows the radiation intensity of the antenna in the xy plane and yz plane at a frequency of 2500MHz; the red solid line represents the main polarization, which is right-hand circular polarization, and the blue dotted line represents the cross polarization, which is left-hand circular polarization. It can be seen that the antenna has a good directional radiation circular polarization effect at the three frequencies of 2483.5MHz, 2491MHz and 2500MHz, and the cross polarization in the +y direction is kept at about -20dB.

[0054] In addition, the antenna design disclosed in this application can change the main polarization and cross polarization through simple operations. Based on this antenna, it is only necessary to exchange the parts connecting the upper and lower layers of the double-wire parallel line feeder of the dielectric substrate and the top of the metal frame to easily switch the polarization mode.

[0055] Finally, the new end-fire circularly polarized antenna based on complementary dipole disclosed in the application is compared with other recently disclosed circularly polarized antennas for satellite communications of smartphones (Documents 1 to 5). The design of the present application has the advantage of end-fire compared to the normal radiation antenna in the existing designs (Documents 4 and 5), and can be well applied to mobile terminal satellite communications. In addition, compared with the end-fire circularly polarized antenna in the existing designs (Documents 1 to 3), the design of the present application has the same impedance bandwidth and axial ratio bandwidth while also having a metal frame. Compared with the mobile phone frame made of plastic, the present design has stronger hardness and better aesthetics, which can bring a better experience to users.

[0056] Reference 1: Z. Cao, L. Chang, Y. Li, K. Wei, and Z. Zhang, “Compact mobile terminal antenna with endfire circularly polarized beam for satellite communications,” IEEE Trans. Antennas Propag., vol. 71, no. 12, pp. 9980 - 9985, Dec. 2023; Reference 2: X. Zhang, K. Wei, Y. Li, and Z. Zhang, “A circularly polarized antenna based on narrowed crossed dipole for smartphone satellite communication,” IEEE Antennas Wireless Propag. Lett., vol. 23, no. 8, pp. 2511 - 2515, Aug. 2024; Reference 3: X. Zhang, K. Wei, Y. Li, and Z. Zhang, “A polarization reconfigurable antenna for satellite communication in foldable smartphone,” IEEE Trans. Antennas Propag., vol. 71, no. 12, pp. 9938 - 9943, Dec. 2023; Reference 4: Y. Zhang, Y. Li, M. Hu, P. Wu, and H. Wang, “Dual - band circular - polarized microstrip antenna for ultrawideband positioning in smartphones with flexible liquid crystal polymer process,” IEEE Trans. Antennas Propag., vol. 71, no. 4, pp. 3155 - 3163, April 2023; Reference 5: M. Hu, Y. Li, Y. Zhang, P. Wu, and H. Wang, “Ultrathin dual - band circularly polarized antenna,” IEEE Antennas Wireless Propag. Lett., vol. 23, no. 3, pp. 930 - 934, March 2024。

[0057] The present application discloses an end-fire circularly polarized mobile phone antenna applicable to satellite communications of mobile terminals. The entire antenna is composed of a dielectric substrate with metal on both sides and a metal frame on the periphery, wherein the metal frame has a cross-shaped cross gap dug at the center of the top. The above antenna is optimized and improved based on complementary dipoles, and a magnetic dipole is formed by a cavity formed by a metallized through-hole, and then phase compensation is performed by two parallel feed lines bent. The ends of the feed lines are directly connected to the metal frame, and the top metal frame with a cross-shaped gap acts as an electric dipole, and finally a good end-fire circular polarization characteristic is achieved under the metal frame. The disclosed antenna is easy to process and low in cost, and also has the advantages of a metal frame, a single-layer structure, and an end-fire circularly polarized beam. It has a good application effect in a mobile terminal with a satellite communication function, and shows great advantages in the application of satellite communications in mobile terminals.

[0058] The embodiment of the present application also discloses a smart terminal, wherein the smart terminal includes a communication circuit and a circularly polarized antenna for satellite communication of a metal frame smart terminal as described in the above embodiment; the communication circuit is electrically connected to the coaxial feed terminal to realize the transmission and reception of antenna signals. The smart terminal in the embodiment of the present application includes not only mobile phones and satellite phones, but also tablet computers, vehicle-mounted multimedia terminals, etc.

[0059] The circularly polarized antenna and intelligent terminal for satellite communication of metal frame intelligent terminal provided in the embodiment of the present application include a metal frame and a dielectric substrate arranged in the metal frame; metal floors are arranged on both sides of the dielectric substrate, and the metal floors on both sides of the dielectric substrate are electrically connected through metallized through holes; a gap is arranged on the top of the metal frame, and the gap separates the metal frame; the end of the dielectric substrate close to the gap does not cover the metal floor and forms a hollow opening; the metallized through hole surrounds the end of the dielectric substrate close to the gap and combines with the hollow opening to form a magnetic dipole; the two metal floors at the magnetic dipole are respectively connected to the two separated connection ends in the metal frame through two parallel feed lines; the feed port is arranged on one side of the cavity close to the feed line. The above antenna is optimized and improved based on complementary dipoles, a magnetic dipole is formed by a cavity formed by metallized through holes, and phase compensation is performed by two bent parallel feed lines, the end of the feed line is directly connected to the metal frame, and the top metal frame with a cross-shaped gap acts as an electric dipole, and finally a good end-fire circular polarization characteristic is achieved under the metal frame. The disclosed antenna is easy to process and has low cost, and also has the advantages of a metal frame, a single-layer structure, and an end-fire circularly polarized beam, and has a good application effect in a mobile terminal with a satellite communication function.

[0060] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A circularly polarized antenna for satellite communication of metal frame intelligent terminal, characterized in that: It comprises a metal frame and a dielectric substrate arranged in the metal frame; Metal floors are provided on both sides of the dielectric substrate, and the metal floors on both sides of the dielectric substrate are electrically connected through metallized through holes; a gap is provided on the top of the metal frame, and the gap separates the metal frame; One end of the dielectric substrate close to the gap is not covered with the metal floor and forms a hollow opening; The metallized through hole surrounds one end of the dielectric substrate close to the gap to form a semi-enclosed cavity, and the cavity and the hollow opening are combined to form a magnetic dipole; the two metal floors at the magnetic dipole are respectively connected to the connection ends located on both sides of the gap in the metal frame through two parallel serpentine feed lines; the metal frame is also provided with a long strip through groove parallel to the dielectric substrate; the long strip through groove intersects the gap vertically; The coaxial feeding terminal is arranged at the feeding port of the dielectric substrate and is respectively connected to the two metal floor plates. The feeding port is arranged at one side of the cavity close to the feed line.

2. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 1, characterized in that: The diameter of the metallized through hole is 0.5-3 mm, and the spacing between the edges of adjacent metallized through holes is 1 / 3-1 / 2 of the diameter of the metallized through hole.

3. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 1 or 2, characterized in that: The metallized through holes are arranged in a rectangular frame shape and enclosed with the hollow opening to form a cavity with a rectangular structure.

4. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 3, characterized in that: The length of the cavity of the rectangular structure is 5 / 7-3 / 4 of the width of the metal frame, and the width of the cavity is 2 / 7-1 / 3 of the length of the cavity.

5. The circularly polarized antenna for satellite communication of metal frame intelligent terminal according to claim 4, characterized in that: The distance between the feeding port and the side of the cavity away from the feeding line is 2 / 3-5 / 7 of the width of the cavity.

6. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 3, characterized in that: The bending portion of the feeder line is chamfered.

7. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 6, characterized in that: The height of the metal frame is 5-10 mm, and the thickness of the dielectric substrate is 1 / 10-1 / 8 of the height of the metal frame.

8. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 7, characterized in that: The length of the long strip through groove is 1 / 2-2 / 3 of the width of the metal frame.

9. The circularly polarized antenna for satellite communication of a metal frame intelligent terminal according to claim 8, characterized in that: The width of the gap is 1 / 2-3 / 5 of the width of the long strip through groove.

10. An intelligent terminal, characterized in that: The smart terminal comprises a communication circuit and a circularly polarized antenna for satellite communication of a metal frame smart terminal as claimed in any one of claims 1 to 9; The communication circuit is electrically connected to the coaxial feeding terminal to achieve transmission and reception of antenna signals.

Images