Dual-frequency circularly polarized antenna capable of being embedded into mobile communication equipment

Abstract

The utility model discloses a dual-frequency circularly polarized antenna capable of being embedded into mobile communication equipment. The dual-frequency circularly polarized antenna comprises a first antenna and a second antenna which are responsible for different frequency bands; the first antenna and the second antenna are vertically arranged near the right upper corner and the left lower corner of the circuit dielectric substrate respectively; each antenna comprises an antenna dielectric substrate, a metal patch assembly and a microstrip line; each metal patch assembly is arranged on the corresponding antenna dielectric substrate, and each metal patch assembly is provided with a slot structure; the microstrip lines are arranged on the circuit dielectric substrate, and the microstrip lines are connected with the corresponding metal patch assemblies. According to the dual-frequency antenna, the first antenna and the second antenna are respectively and vertically arranged near the right upper corner and the left lower corner of the circuit dielectric substrate, so that the space is saved for the upper layer of the circuit dielectric substrate to realize miniaturization, the design requirements of the mobile communication equipment for being thin, flat and long are met, and the circular polarization characteristic of the dual-frequency antenna is also realized; parasitic coupling feeding is achieved through the gap structure, the antenna efficiency is improved, and the antenna bandwidth is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to a dual-frequency circularly polarized antenna that can be embedded in a mobile communication device. Background Art

[0002] With the rapid development of global mobile communication and satellite navigation technologies, mobile communication devices not only need to handle higher-speed data transmission but also provide more accurate positioning services. In this context, the performance requirements for antennas integrated in mobile communication devices are becoming increasingly stringent. Especially in the scenario of pedestrian navigation, positioning accuracy becomes a key consideration factor. In traditional antenna components, in order to achieve the precise positioning function, a dual-frequency satellite navigation antenna is generally used for positioning. The commonly used dual-frequency satellite navigation antennas that can be embedded in mobile communication devices are linearly polarized dual-frequency satellite navigation antennas. However, compared with circularly polarized antennas, linearly polarized antennas have poor anti-interference ability and anti-multipath fading ability in a multipath propagation environment, resulting in limited positioning accuracy. In addition, there are also some dual-frequency circularly polarized satellite navigation antennas in use, such as stacked high-dielectric patch antennas or printed four-wire helix antennas. For stacked high-dielectric patch antennas, although using a ceramic load substrate with a relatively expensive high dielectric constant can reduce the size of the microstrip antenna, it will bring disadvantages such as lower antenna efficiency, narrower bandwidth, and excessive dielectric load. For printed four-wire helix antennas, although they can well achieve antenna parameter indicators such as L1 and L5 dual-frequency circular polarization, they do not meet the slender and flat requirements of current mobile communication devices.

[0003] Therefore, it is difficult for the dual-frequency circularly polarized antennas provided by the prior art to meet the design requirements of mobile communication devices while maintaining high performance. Summary of the Utility Model

[0004] The utility model provides a dual-frequency circularly polarized antenna that can be embedded in a mobile communication device, aiming to solve the technical problem that it is difficult for existing dual-frequency circularly polarized antennas to meet the design requirements of mobile communication devices while maintaining high performance.

[0005] A dual-frequency circularly polarized antenna that can be embedded in a mobile communication device provided by the utility model includes: a circuit dielectric substrate and two antennas responsible for different frequency bands, divided into a first antenna and a second antenna;

[0006] The first antenna and the second antenna are respectively vertically arranged near the upper right corner and the lower left corner of the circuit dielectric substrate;

[0007] Each antenna includes an antenna dielectric substrate, a metal patch component, and a microstrip line;

[0008] Each metal patch component is arranged on the corresponding antenna dielectric substrate, and the metal patch component has a slot structure;

[0009] The microstrip line is disposed on a circuit dielectric substrate, and the microstrip line is connected to a corresponding metal patch component.

[0010] Further, the metal patch component includes an inner metal patch and an outer metal patch, and there is an inverted U-shaped gap between the inner metal patch and the outer metal patch, so that the inner metal patch and the outer metal patch form an equivalent capacitance structure;

[0011] The feeding end of the microstrip line is connected to the corresponding inner metal patch for feeding the inner metal patch.

[0012] Further, it further includes: a ground plane;

[0013] The ground plane is disposed on the lower surface of the circuit dielectric substrate;

[0014] The circuit dielectric substrate is provided with a metal through hole;

[0015] The outer metal patch is connected to the ground plane through the metal through hole.

[0016] Further, the first antenna includes a first antenna dielectric substrate, an L5-band outer metal patch, an L5-band inner metal patch, and an L5-band microstrip line; an inverted U-shaped gap is formed between the L5-band outer metal patch and the L5-band inner metal patch; the L5-band microstrip line is disposed at the upper right corner of the circuit dielectric substrate, and its feeding end is connected to the L5-band inner metal patch;

[0017] The second antenna includes a second antenna dielectric substrate, an L1-band outer metal patch, an L1-band inner metal patch, and an L1-band microstrip line; an inverted U-shaped gap is formed between the L1-band outer metal patch and the L1-band inner metal patch; the L1-band microstrip line is disposed near the lower left corner of the circuit dielectric substrate, and its feeding end is connected to the L1-band inner metal patch.

[0018] Further, the first antenna dielectric substrate and the second antenna dielectric substrate are respectively vertically mounted near the upper right corner and the lower left corner of the antenna dielectric substrate;

[0019] The upper right corner and the lower left corner of the antenna dielectric substrate are respectively provided with a first metal through hole and a second metal through hole; the L5-band outer metal patch is connected to the ground plane through the first metal through hole; the L1-band outer metal patch is connected to the ground plane through the second metal through hole.

[0020] Further, both the circuit dielectric substrate and the antenna dielectric substrate are in a cuboid structure.

[0021] Further, the dielectric materials of the circuit dielectric substrate and the antenna dielectric substrate are both FR4;

[0022] The impedance of the microstrip line is specifically 50 .

[0023] Further, the inner metal patch is arranged in a rectangular structure, and the outer metal patch is arranged in an inverted U-shaped structure.

[0024] Further, the length and width of the circuit dielectric substrate are 164 mm and 74 mm respectively;

[0025] The length, width and height of the first antenna dielectric substrate are 40 mm, 0.8 mm and 5 mm respectively;

[0026] The length, width and height of the second antenna dielectric substrate are 30 mm, 0.8 mm and 5 mm respectively;

[0027] The second antenna dielectric substrate is installed at a position 23.1 mm away from the lower left corner edge of the circuit dielectric substrate.

[0028] Further, the ground plane is made of a thin metal copper sheet, and the ground plane has the same cross-sectional area as the antenna dielectric substrate.

[0029] From the above technical solutions, it can be seen that the present utility model has the following advantages:

[0030] The present utility model provides a dual-band circularly polarized antenna that can be embedded in a mobile communication device, including: a circuit dielectric substrate and two antennas responsible for different frequency bands, divided into a first antenna and a second antenna; the first antenna and the second antenna are respectively vertically arranged near the upper right corner and the lower left corner of the circuit dielectric substrate; each antenna includes an antenna dielectric substrate, a metal patch assembly and a microstrip line; each metal patch assembly is arranged on the corresponding antenna dielectric substrate, and the metal patch assembly has a slot structure; the microstrip line is arranged on the circuit dielectric substrate, and the microstrip line is connected to the corresponding metal patch assembly.

[0031] In the present utility model, the first antenna and the second antenna are vertically arranged on the circuit dielectric substrate, saving space for the increasingly crowded upper layer of the circuit dielectric substrate, realizing miniaturization, and meeting the design requirements of the thin, flat and long mobile communication device; the first antenna and the second antenna are respectively arranged near the upper right corner and the lower left corner of the circuit dielectric substrate, realizing the circular polarization characteristic of the dual-band antenna; through the slot structure, parasitic coupling feeding is realized, improving the antenna efficiency and increasing the antenna bandwidth, thereby solving the technical problem that the existing dual-band circularly polarized antenna is difficult to meet the design requirements of the mobile communication device while maintaining high performance. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the structure of the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0034] Figure 2 Left view of the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0035] Figure 3 Top view of the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0036] Figure 4 Left view of the first antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0037] Figure 5 Top view of the first antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0038] Figure 6 Left view of the second antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0039] Figure 7 Top view of the second antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application;

[0040] Figure 8 S11 parameter diagram of the first antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application in the L5 frequency band;

[0041] Figure 9 S22 parameter diagram of the second antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application in the L1 frequency band;

[0042] Figure 10 Actual gain parameter diagram of the first antenna on the antenna model of the dual - frequency circularly polarized antenna that can be embedded in a mobile communication device provided by this application in the L5 frequency band;

[0043] Figure 11The actual gain parameter diagram of the second antenna of the antenna model of the dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by this application in the L1 frequency band;

[0044] Figure 12 The axial ratio parameter diagram of the first antenna of the antenna model of the dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by this application in the L5 frequency band;

[0045] Figure 13 The axial ratio parameter diagram of the second antenna of the antenna model of the dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by this application in the L1 frequency band;

[0046] Figure 14 The real part of the impedance of the second antenna of the antenna model of the dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by this application versus the slot width variation parameter diagram;

[0047] Figure 15 The imaginary part of the impedance of the second antenna of the antenna model of the dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by this application versus the slot width variation parameter diagram;

[0048] Figure 16 The axial ratio of the second antenna of the antenna model of the dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by this application versus the distance from the second antenna to the corner variation parameter diagram.

[0049] Among them, the reference numerals are: circuit dielectric substrate 1, inner layer metal patch 2 in the L5 frequency band, outer layer metal patch 3 in the L5 frequency band, inverted U-shaped slot 4 between the inner and outer layer metal patches in the L5 frequency band, microstrip line 5 in the L5 frequency band, first metal through hole 6, inner layer metal patch 7 in the L1 frequency band, outer layer metal patch 8 in the L1 frequency band, inverted U-shaped slot 9 between the inner and outer layer metal patches in the L1 frequency band, microstrip line 10 in the L1 frequency band, second metal through hole 11, first antenna dielectric substrate 12, second antenna dielectric substrate 13, and ground plane 14. Detailed implementation

[0050] The embodiment of the present utility model provides a dual-band circularly polarized antenna that can be embedded in a mobile communication device, which is used to solve the technical problem that the existing dual-band circularly polarized antenna is difficult to meet the design requirements of mobile communication devices while maintaining high performance.

[0051] In order to make the utility model purpose, features and advantages of the present utility model more obvious and understandable, the following will combine the drawings in the embodiments of the present utility model to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model.

[0052] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0053] Unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] Please refer to Figures 1-3 , an embodiment of a dual-band circularly polarized antenna that can be embedded in a mobile communication device provided by the present application, includes: a circuit dielectric substrate 1 and two antennas responsible for different frequency bands, divided into a first antenna and a second antenna;

[0055] The first antenna and the second antenna are respectively vertically arranged near the upper right corner and the lower left corner of the circuit dielectric substrate 1;

[0056] Each antenna includes an antenna dielectric substrate, a metal patch component and a microstrip line; each metal patch component is arranged on the corresponding antenna dielectric substrate, and the metal patch component has a slot structure; the microstrip line is arranged on the circuit dielectric substrate 1, and the microstrip line is connected to the corresponding metal patch component.

[0057] It should be noted that the first antenna is mainly responsible for the L5 frequency band, and the metal patch component of the first antenna plays the role of radiating the L5 frequency band; the second antenna is mainly responsible for the L1 frequency band, and the metal patch component of the second antenna plays the role of radiating the L1 frequency band; the microstrip line is arranged on the circuit dielectric substrate 1 for signal transmission.

[0058] To achieve miniaturization, the first antenna and the second antenna are vertically arranged on the circuit dielectric substrate 1, saving space for the increasingly crowded upper layer of the circuit dielectric substrate 1, meeting the design requirements of the slender and flat mobile communication device, and reducing the processing cost. The antenna realizes parasitic coupling feeding through a slot structure, forming a parallel LC resonator on each antenna to improve the antenna efficiency and increase the antenna bandwidth, thereby improving the signal receiving and transmitting capabilities of the mobile communication device and enabling the antenna to operate in a wider frequency band range; at the same time, the first antenna and the second antenna are respectively arranged near the upper right corner and the lower left corner of the circuit dielectric substrate 1 to achieve right-handed circular polarization and achieve the circular polarization characteristics of the dual-band circular polarization antenna.

[0059] In practical applications, by adjusting the widths of the two side slots of the slot structure and cooperating with the microstrip line, flexible adjustment of impedance matching can be achieved; by adjusting the positions of the microstrip line and the antenna dielectric substrates of each antenna, good antenna circular polarization characteristics can be obtained.

[0060] The dual-band circular polarization antenna provided by the present utility model has the characteristics of miniaturization and low manufacturing cost. At the same time, the first antenna in the L5 frequency band and the second antenna in the L1 frequency band have good performance and meet the design requirements of the flat and long mobile communication device.

[0061] In a specific embodiment, the metal patch assembly includes an inner-layer metal patch and an outer-layer metal patch, and there is an inverted U-shaped slot between the inner-layer metal patch and the outer-layer metal patch, so that the inner-layer metal patch and the outer-layer metal patch form an equivalent capacitance structure; the feeding end of the microstrip line is connected to the corresponding inner-layer metal patch for feeding the inner-layer metal patch.

[0062] It can be understood that the inverted U-shaped slot divides the metal patch assembly into an inner-layer metal patch and an outer-layer metal patch, reducing the overall size of the antenna; at the same time, the inner-layer metal patch and the outer-layer metal patch form an equivalent capacitance structure, further increasing the antenna bandwidth, achieving better impedance matching, and thus improving the antenna efficiency and actual gain.

[0063] In a specific embodiment, it further includes: a ground plane 14; the ground plane 14 is arranged on the lower surface of the circuit dielectric substrate 1; the circuit dielectric substrate 1 is provided with metal through holes; the outer-layer metal patch is connected to the ground plane 14 through the metal through holes.

[0064] It should be noted that the ground plane 14 can serve as the ground plane of the dual-band circular polarization antenna to attract current and provide a good current return path for the antenna. At the same time, the ground plane 14 arranged on the lower surface of the circuit dielectric substrate 1 can reduce the back radiation of the antenna; the outer-layer metal patch is short-circuited to the ground plane 14 through the metal through holes, enhancing the working stability of the antenna.

[0065] In a specific embodiment, the first antenna includes a first antenna dielectric substrate 12, an L5-band outer metal patch 3, an L5-band inner metal patch 2, and an L5-band microstrip line 5; there is an inverted U-shaped slot 4 between the L5-band outer metal patch 3 and the L5-band inner metal patch 2; the L5-band microstrip line 5 is disposed at the upper right corner of the circuit dielectric substrate 1, and its feeding end is connected to the L5-band inner metal patch 2;

[0066] The second antenna includes a second antenna dielectric substrate 13, an L1-band outer metal patch 8, an L1-band inner metal patch 7, and an L1-band microstrip line 10; there is an inverted U-shaped slot 9 between the L1-band outer metal patch 8 and the L1-band inner metal patch 7; the L1-band microstrip line 10 is disposed near the lower left corner of the circuit dielectric substrate 1, and its feeding end is connected to the L1-band inner metal patch 7.

[0067] In a specific embodiment, the first antenna dielectric substrate 12 and the second antenna dielectric substrate 13 are respectively vertically mounted near the upper right corner and the lower left corner of the antenna dielectric substrate; a first metal through hole 6 and a second metal through hole 11 are respectively formed near the upper right corner and the lower left corner of the antenna dielectric substrate; the L5-band outer metal patch 3 is connected to the ground plane 14 through the first metal through hole 6; the L1-band outer metal patch 8 is connected to the ground plane 14 through the second metal through hole 11.

[0068] In a specific embodiment, both the circuit dielectric substrate 1 and the antenna dielectric substrate are in a cuboid structure.

[0069] In a specific embodiment, the dielectric materials of both the circuit dielectric substrate 1 and the antenna dielectric substrate are FR4; the impedance of the microstrip line is specifically 50 . It can be understood that, compared with other high-dielectric constant materials, FR4 has a smaller dielectric loss as a dielectric material. In this embodiment, FR4 is used as the dielectric material, combined with the slot structure design of the metal patch assembly, so that the dual-band circularly polarized antenna not only realizes miniaturization but also achieves good antenna performance.

[0070] In a specific embodiment, the inner metal patch is arranged in a rectangular structure, and the outer metal patch is arranged in an inverted U-shaped structure.

[0071] In a specific embodiment, the length and width of the circuit dielectric substrate 1 are 164 mm and 74 mm respectively; the length, width and height of the first antenna dielectric substrate 12 are 40 mm, 0.8 mm and 5 mm respectively; the length, width and height of the second antenna dielectric substrate 13 are 30 mm, 0.8 mm and 5 mm respectively; the second antenna dielectric substrate 13 is mounted at a distance of 23.1 mm from the lower left corner edge of the circuit dielectric substrate 1.

[0072] Among them, combined with Figure 4 andFigure 5 , the specific specifications of the first antenna of the present utility model are shown in Table 1.

[0073] Table 1 Specifications of the First Antenna of the Dual-Frequency Circularly Polarized Antenna

[0074]

[0075] Among them, combining Figure 6 and Figure 7 , the specific specifications of the second antenna of the present utility model are shown in Table 2.

[0076] Table 2 Specifications of the Second Antenna of the Dual-Frequency Circularly Polarized Antenna

[0077]

[0078] Taking the structure provided in this embodiment as an example, a miniaturized dual-frequency circularly polarized antenna model that can be embedded in a mobile communication device is established, Figures 8-16 and the performance effects of the antenna model provided in this embodiment are specifically described.

[0079] In terms of the return loss performance, Figure 8 it shows that the S11 parameter of the first antenna of the miniaturized dual-frequency circularly polarized antenna model that can be embedded in a mobile communication device reaches -29.92 dB at the center frequency of 1176 MHz in the L5 band, and the S11 parameters within the L5 band are all less than -10 dB, meeting the design specifications; Figure 9 it shows that the S22 parameter of the second antenna of the miniaturized dual-frequency circularly polarized antenna model that can be embedded in a mobile communication device reaches -28.7 dB at the center frequency of 1176 MHz in the L1 band, and the S22 parameters within the L1 band are all less than -10 dB, meeting the design specifications. Therefore, the first antenna and the second antenna of the miniaturized dual-frequency circularly polarized antenna model provided in this embodiment have small return loss, achieve better antenna performance, and meet the design specifications.

[0080] In terms of the antenna gain performance, Figure 10 it shows that the first antenna of the miniaturized dual-frequency circularly polarized antenna model that can be embedded in a mobile communication device achieves an actual gain of 0.96 dB at the center frequency of 1176 MHz in the L5 band; Figure 11 it shows that the second antenna of the miniaturized dual-frequency circularly polarized antenna model that can be embedded in a mobile communication device achieves an actual gain of 1.1 dB at the center frequency of 1575 MHz in the L1 band.

[0081] In terms of the circular polarization performance characteristics, Figure 12It is illustrated that the axial ratio of the first antenna of the miniaturized dual - band circularly polarized antenna model that can be embedded in a mobile communication device at the center frequency of 1176 MHz in the L5 band is 2.31 dB, and the axial ratio within the L5 band is less than 3 dB, enabling the antenna to meet the design index of circular polarization. Figure 13 It is illustrated that the axial ratio of the second antenna of the miniaturized dual - band circularly polarized antenna model that can be embedded in a mobile communication device at the center frequency of 1575 MHz in the L1 band is 2.06 dB, and the axial ratio within the L1 band is less than 3 dB, enabling the antenna to meet the design index of circular polarization.

[0082] In terms of impedance matching performance, Figure 14 and 15 It is illustrated that the slot width W3 of the second antenna of the miniaturized dual - band circularly polarized antenna model that can be embedded in a mobile communication device has a relatively large impact on the impedance matching of the antenna. When the slot width W3 = 0.5 mm, the impedance of the antenna is 52.63 + 2.56 j, approaching the impedance matching of 50 ohms, thus achieving better antenna performance.

[0083] During the test, it is found that the setting position of the second - antenna dielectric substrate 13 of the second antenna needs to be at a certain distance from the lower - left corner edge of the circuit dielectric substrate 1 to meet the axial - ratio index requirements of the antenna. Please refer to Figure 16 , Figure 16 It shows that the axial ratio of the second antenna of the miniaturized dual - band circularly polarized antenna model that can be embedded in a mobile communication device changes significantly with the distance from the corner. It drops from 4.41 dB to 2.23 dB. The axial ratio in the L1 band is less than 3 dB, enabling the antenna to meet the design index of circular polarization.

[0084] In a specific embodiment, the ground plane 14 is made of a thin metal copper sheet, and the ground plane 14 has the same cross - sectional area as the antenna dielectric substrate.

[0085] A dual - band circularly polarized antenna provided by the present utility model that can be embedded in a mobile communication device has the following advantages:

[0086] 1. An inverted U - shaped slot is formed between the inner - layer metal patch and the outer - layer metal patch. Using the parasitic - coupling feeding technology to design a compact antenna, achieving the goals of antenna miniaturization, impedance matching, and excellent antenna parameters.

[0087] 2. Combining the antenna dielectric substrate, the metal patch assembly with an inverted U - shaped slot, the microstrip line, and the ground plane, by adjusting the antenna structure formed by the parallel LC resonator formed by the metal patch assembly, controlling the current attracted by the antenna and the edge of the nearby ground plane, so as to obtain an ideal pattern and polarization characteristics, meeting the antenna index requirements of mobile communication devices.

[0088] 3. Improve the circular polarization performance of the dual-band antenna by adjusting the feeding position of the microstrip line and the positions of the first antenna and the second antenna.

[0089] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-frequency circularly polarized antenna that can be embedded in a mobile communication device, characterized in that: include: A circuit dielectric substrate and two antennas responsible for different frequency bands, which are divided into a first antenna and a second antenna; The first antenna and the second antenna are respectively vertically arranged near the upper right corner and the lower left corner of the circuit dielectric substrate; Each antenna includes an antenna dielectric substrate, a metal patch component and a microstrip line; Each metal patch component is arranged on a corresponding antenna dielectric substrate, and the metal patch component has a gap structure; The microstrip line is arranged on a circuit dielectric substrate, and the microstrip line is connected to a corresponding metal patch component.

2. The dual-frequency circularly polarized antenna according to claim 1, characterized in that: The metal patch assembly includes an inner metal patch and an outer metal patch, and an inverted U-shaped gap is provided between the inner metal patch and the outer metal patch, so that the inner metal patch and the outer metal patch form an equivalent capacitor structure; The feeding end of the microstrip line is connected to the corresponding inner metal patch for feeding the inner metal patch.

3. The dual-frequency circularly polarized antenna according to claim 2, characterized in that: Also includes: Ground plate; The ground plate is arranged on the lower surface of the circuit dielectric substrate; The circuit dielectric substrate is provided with metal through holes; The outer metal patch is connected to the ground plate through the metal through hole.

4. The dual-frequency circularly polarized antenna according to any one of claims 1 to 3, characterized in that: The first antenna comprises a first antenna dielectric substrate, an L5 frequency band outer metal patch, an L5 frequency band inner metal patch and an L5 frequency band microstrip line; an inverted U-shaped gap is provided between the L5 frequency band outer metal patch and the L5 frequency band inner metal patch; the L5 frequency band microstrip line is arranged at the upper right corner of the circuit dielectric substrate, and a feeding end thereof is connected to the L5 frequency band inner metal patch; The second antenna includes a second antenna dielectric substrate, an L1 frequency band outer metal patch, an L1 frequency band inner metal patch and an L1 frequency band microstrip line; an inverted U-shaped gap is provided between the L1 frequency band outer metal patch and the L1 frequency band inner metal patch; the L1 frequency band microstrip line is arranged near the lower left corner of the circuit dielectric substrate, and a feeding end thereof is connected to the L1 frequency band inner metal patch.

5. The dual-frequency circularly polarized antenna according to claim 4, characterized in that: The first antenna dielectric substrate and the second antenna dielectric substrate are respectively vertically mounted near the upper right corner and the lower left corner of the antenna dielectric substrate; A first metal through hole and a second metal through hole are respectively opened near the upper right corner and the lower left corner of the antenna dielectric substrate; the L5 frequency band outer metal patch is connected to the ground plate through the first metal through hole; the L1 frequency band outer metal patch is connected to the ground plate through the second metal through hole.

6. The dual-frequency circularly polarized antenna according to claim 1, characterized in that: The circuit dielectric substrate and the antenna dielectric substrate are both rectangular parallelepiped structures.

7. The dual-frequency circularly polarized antenna according to claim 1, characterized in that: The dielectric materials of the circuit dielectric substrate and the antenna dielectric substrate are both FR4; The impedance of the microstrip line is specifically 50Ω.

8. The dual-frequency circularly polarized antenna according to claim 2, characterized in that: The inner metal patch is arranged in a rectangular structure, and the outer metal patch is arranged in an inverted U-shaped structure.

9. The dual-frequency circularly polarized antenna according to claim 5, characterized in that: The length and width of the circuit dielectric substrate are 164 mm and 74 mm respectively; The length, width and height of the first antenna dielectric substrate are 40 mm, 0.8 mm and 5 mm respectively; The length, width and height of the second antenna dielectric substrate are 30 mm, 0.8 mm and 5 mm respectively; The second antenna dielectric substrate is installed 23.1 mm away from the lower left corner edge of the circuit dielectric substrate.

10. The dual-frequency circularly polarized antenna according to claim 3, characterized in that: The ground plate is made of a metal copper sheet, and the cross-sectional area of ​​the ground plate is the same as that of the antenna dielectric substrate.

Images