L-band radar antenna and portable radar equipment

Abstract

The utility model relates to the technical field of radar antennas, in particular to an L-band radar antenna and portable radar equipment, the L-band radar antenna comprises a PCB (printed circuit board) copper-clad antenna structure and a feed point, the PCB copper-clad antenna structure comprises a PCB and a copper-clad antenna, the copper-clad antenna is printed on the PCB to form a monopole antenna, the feed point is formed at the edge of the copper-clad antenna, and the feed point is formed at the edge of the PCB. The feed point is used for being connected with a radio frequency receiving channel of a radar receiver. The thickness of the copper clad on the PCB is very small, a monopole antenna with a very small size is formed, the gain of at least-3dBi can be realized, and good signal receiving capability is ensured. Due to the adoption of the PCB copper-clad material, the antenna provided by the utility model is relatively low in production cost, and the manufacturing process is simplified at the same time; due to the design of the monopole antenna and the thin structure of the monopole antenna, the monopole antenna is very suitable for handheld equipment with limited space, the copper-clad antenna is directly printed on a PCB (printed circuit board) of the equipment, the copper-clad antenna can be conveniently integrated with other circuit components, and the assembly steps are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of radar antennas, in particular to an L-band radar antenna and a portable radar device. Background Art

[0002] In recent years, with the rapid development of satellite positioning communication systems, radar antennas built into handheld devices have attracted more and more attention. As the size of wireless communication terminal equipment continues to shrink, higher requirements are placed on the size of antennas. Antennas suitable for handheld radar systems and other portable electronic devices have become an important development direction of modern antenna technology.

[0003] The antennas used in existing portable electronic devices are mostly microstrip patch antennas. There are two main methods for miniaturizing microstrip patch antennas: one is to reduce the size of the antenna by digging grooves of various shapes on the patch, and the other is to cover the patch with a material with a high dielectric constant (such as ceramic) to reduce the size of the antenna. Although these methods can effectively reduce the size of the microstrip patch antenna, they increase the process flow of the microstrip patch antenna, increase the difficulty of antenna preparation, and also increase the production cost. Utility Model Content

[0004] The utility model provides an L-band radar antenna and a portable radar device, which are used to solve the defects of difficulty and high cost in manufacturing antennas in existing portable electronic devices, and realize a low-cost, small-sized and easy-to-integrate antenna that can be used in the field of handheld radar.

[0005] The utility model provides an L-band radar antenna, comprising a PCB copper-clad antenna structure and a feed point formed on the PCB copper-clad antenna structure. The PCB copper-clad antenna structure comprises a PCB board and a copper-clad antenna. The copper-clad antenna is printed on the PCB board to form a monopole antenna. The feed point is formed at the edge of the copper-clad antenna and is used to connect to a radio frequency receiving channel of a radar receiver.

[0006] According to an L-band radar antenna provided by the utility model, the copper-clad antenna printed on the PCB board forms a first copper-clad area and a second copper-clad area, the first copper-clad area is an L-shaped structure, the second copper-clad area is a rectangular structure, a gap is formed between the first copper-clad area and the second copper-clad area, and the feeding point is constructed on an edge of the second copper-clad area away from the first copper-clad area.

[0007] According to an L-band radar antenna provided by the present invention, the first copper-clad area includes a rectangular copper-clad horizontal portion and a rectangular copper-clad vertical portion, a first gap is formed between the second copper-clad area and the rectangular copper-clad horizontal portion, and a second gap is formed between the second copper-clad area and the rectangular copper-clad vertical portion.

[0008] According to an L-band radar antenna provided by the utility model, the length of the rectangular copper-clad horizontal portion is 35mm~45mm, and the width is 3mm~7mm; the length of the rectangular copper-clad vertical portion is 10mm~20mm, and the width is 1mm~3mm; the length of the second copper-clad area is 15mm~25mm, and the width is 5mm~10mm; the first gap size is 0.8mm~1.2mm, and the size of the second gap is 2.5mm~4.5mm.

[0009] According to an L-band radar antenna provided by the present invention, the rectangular copper clad area is 40 mm long and 5 mm wide; the rectangular copper clad area is 15 mm long and 2 mm wide; the second copper clad area is 20 mm long and 8 mm wide; the first gap size is 1 mm, and the second gap size is 3.5 mm.

[0010] The present utility model also provides a portable radar device, comprising the L-band radar antenna described in any one of the above items, and also comprising a radar receiver, wherein the feed point of the L-band radar antenna is connected to the radio frequency receiving channel of the radar receiver.

[0011] According to a portable radar device provided by the present invention, the feed point of the L-band radar antenna is connected to the radio frequency receiving channel of the radar receiver through a coaxial cable, the core end of the coaxial cable is welded to the feed point, and the outer periphery of the core of the coaxial cable is wrapped with a shielding layer cable.

[0012] According to a portable radar device provided by the present utility model, a shielding grounding copper clad area is also formed on the PCB board of the L-band radar antenna. The shielding grounding copper clad area forms double-sided copper cladding on the PCB board, and the shielding grounding copper clad area is connected to the metal casing of the radar receiver.

[0013] According to a portable radar device provided by the utility model, an exposed copper area is formed on the shielded grounding copper-clad area, and the shielding layer cable of the coaxial line is passed through and welded to the exposed copper area, so that the feed point and the RF receiving channel of the radar receiver are connected through the wire core of the coaxial line.

[0014] According to the portable radar device provided by the present invention, the PCB board of the L-band radar antenna and the circuit PCB board of the radar receiver are the same PCB board.

[0015] The L-band radar antenna and portable radar device provided by the present invention utilize copper cladding directly printed on a PCB to form a copper-clad antenna. Feed points are formed along the edges of the copper-clad antenna. The copper-clad antenna captures radar signals from the surrounding environment through its structure. These signals are then transmitted to the radar receiver's RF receiving channel via the feed points. These signals then undergo a series of processing within the receiver, such as amplification and filtering, ultimately converting them into useful information. In the L-band radar antenna structure of the present invention, the copper clad on the PCB is very thin, forming a compact monopole antenna capable of achieving a gain of at least -3dBi, ensuring excellent signal reception. The use of copper clad PCB material reduces production costs and simplifies the manufacturing process. The monopole antenna's design and thin structure make it ideal for handheld devices with limited space. Furthermore, the copper-clad antenna is printed directly on the device's PCB, facilitating integration with other circuit components and reducing assembly steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the L-band radar antenna provided by the utility model.

[0018] Figure 2 The utility model provides an L-band radar antenna with a pitch and elevation pattern at a frequency of 1 GHz.

[0019] Figure 3 The utility model provides an L-band radar antenna with a pitch and elevation pattern at a frequency of 2 GHz.

[0020] Figure numerals: 1, feed point; 2, PCB board; 3, copper-clad antenna; 31, first copper-clad area; 311, rectangular copper-clad horizontal part; 312, rectangular copper-clad vertical part; 32, second copper-clad area; 4, first gap; 5, second gap; 6, shielding grounding copper-clad area; 61, exposed copper area. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0024] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0026] The following combination Figures 1 to 3 The specific structure and working principle of the L-band radar antenna and portable radar equipment of the present invention are described.

[0027] An embodiment of the present invention provides an L-band radar antenna. Figure 1 As shown, the L-band radar antenna includes a PCB copper-clad antenna structure and a feed point 1 formed on the PCB copper-clad antenna structure. The PCB copper-clad antenna structure includes a PCB board 2 and a copper-clad antenna 3. The copper-clad antenna 3 is printed on the PCB board 2 to form a monopole antenna. The feed point 1 is formed at the edge of the copper-clad antenna 3 and is used to connect to the RF receiving channel of the radar receiver.

[0028] The L-band radar antenna in the structure of the above embodiment is directly printed on a PCB board 2 using a copper clad method to form a copper clad antenna 3. A feed point 1 is formed on the edge of the copper clad antenna 3. The copper clad antenna 3 captures radar signals from the surrounding environment through its structure. The captured signals are transmitted to the RF receiving channel of the radar receiver through the feed point 1 (feeding point). Subsequently, these signals undergo a series of processing within the receiver, such as amplification and filtering, and are ultimately converted into useful information.

[0029] As can be appreciated, the L-band radar antenna structure of this embodiment utilizes a very thin copper clad layer on the PCB 2, forming a compact monopole antenna capable of achieving a gain of at least -3dBi, ensuring excellent signal reception. The use of copper clad PCB material reduces production costs and simplifies the manufacturing process. The monopole antenna's design and thin structure make it ideal for space-constrained handheld devices. Furthermore, the copper-clad antenna 3 is printed directly on the device's PCB 2, facilitating integration with other circuit components and reducing assembly steps.

[0030] In some embodiments of the L-band radar antenna of the present invention, see again Figure 1As shown, the copper-clad antenna 3 printed on the PCB board 2 is formed with a first copper-clad area 31 and a second copper-clad area 32. The first copper-clad area 31 is an L-shaped structure, and the second copper-clad area 32 is a rectangular structure. A gap is formed between the first copper-clad area 31 and the second copper-clad area 32. A feed point 1 is constructed on an edge of the second copper-clad area 32 away from the first copper-clad area 31. In some examples, the first copper-clad area 31 includes a rectangular copper-clad horizontal portion 311 and a rectangular copper-clad vertical portion 312. A first gap 4 is formed between the second copper-clad area 32 and the rectangular copper-clad horizontal portion 311, and a second gap 5 is formed between the second copper-clad area 32 and the rectangular copper-clad vertical portion 312.

[0031] As can be understood, this embodiment provides a PCB copper-clad antenna structure with a specific structure, achieving specific radiation characteristics through different copper-clad areas and gaps. Specifically, the L-shaped structure of the first copper-clad area 31 influences the propagation path and phase of electromagnetic waves, helping to achieve a specific radiation pattern; the rectangular structure of the second copper-clad area 32 determines the primary radiation direction and gain. The first copper-clad area 31 couples with the second copper-clad area 32 through the first gap 4 and the second gap 5, jointly participating in the radiation of electromagnetic waves. The first gap 4 provides a coupling path from the rectangular copper-clad horizontal portion 311 to the second copper-clad area 32, while the second gap 5 provides a coupling path from the rectangular copper-clad vertical portion 312 to the second copper-clad area 32. The first gap 4 and the second gap 5 jointly control the phase difference of electromagnetic waves between the two copper-clad areas. The size and shape of the gaps also affect the antenna's radiation pattern, optimizing the mainlobe direction and sidelobe suppression. By adjusting the widths of the first gap 4 and the second gap 5, the antenna's input impedance can be optimized to match the characteristic impedance of the feeder, thereby improving the antenna's efficiency and bandwidth.

[0032] To improve the antenna's efficiency and bandwidth, in some embodiments, the rectangular copper-clad horizontal portion 311 has a length of 35mm to 45mm and a width of 3mm to 7mm; the rectangular copper-clad vertical portion 312 has a length of 10mm to 20mm and a width of 1mm to 3mm; the second copper-clad area 32 has a length of 15mm to 25mm and a width of 5mm to 10mm; the first gap 4 has a size of 0.8mm to 1.2mm, and the second gap 5 has a size of 2.5mm to 4.5mm. Specifically, in some specific examples, the rectangular copper-clad horizontal portion 311 has a length of 40mm and a width of 5mm; the rectangular copper-clad vertical portion 312 has a length of 15mm and a width of 2mm; the second copper-clad area 32 has a length of 20mm and a width of 8mm; the first gap 4 has a size of 1mm, and the second gap 5 has a size of 3.5mm. All of these dimensions have a tolerance of ±5%. Copper-clad antenna 3 was formed on PCB board 2 using these dimensions, and a simulation test of antenna radiation energy at L-band frequencies was conducted.

[0033] It is important to understand that the L-band frequency is in the 1-2 GHz radio wave band. The following tests the antenna radiation energy in the L-band for the L-band radar antenna in the above size example, specifically simulating the 1 GHz and 2 GHz radio wave bands.

[0034] See also Figure 2 As shown, Figure 2 The figure illustrates the elevation pattern of the L-band radar antenna of the present invention at a frequency of 1 GHz. In the figure, the horizontal axis represents the azimuth angle (Phi), while the vertical axis represents the elevation angle (Theta). These two parameters together determine the direction in which the antenna radiates energy. The antenna gain curve in the figure shows that the main lobe is located at approximately 91.2 degrees, with a gain of approximately -2.2 dB, indicating that the antenna has the strongest radiation capability in this direction. In addition to the main lobe, there are smaller side lobes distributed in other directions, whose gain is much weaker than the main lobe. At a frequency of 1 GHz, the L-band radar antenna of the present invention can achieve a gain variation ranging from approximately -25 dB to -2.2 dB in different directions. This also allows the determination of the antenna's optimal radiation direction and the changing trend of its radiation intensity.

[0035] See also Figure 3 As shown, Figure 3 The figure illustrates the elevation pattern of the L-band radar antenna of the present invention at a frequency of 2 GHz. The horizontal axis represents the azimuth angle (Phi), while the vertical axis represents the elevation angle (Theta). These two parameters together determine the direction in which the antenna radiates energy. The antenna gain curve in the figure shows that the main lobe is located at approximately 139 degrees, with a gain of approximately -2.2 dB, indicating that the antenna has the strongest radiation capability in this direction. In addition to the main lobe, there are smaller side lobes distributed in other directions, whose gain is much weaker than the main lobe. At a frequency of 2 GHz, the L-band radar antenna of the present invention can achieve a gain variation ranging from approximately -10 dB to -2.2 dB in different directions. This also allows the determination of the antenna's optimal radiation direction and the changing trend of its radiation intensity.

[0036] On the other hand, the present invention also provides a portable radar device. In some specific embodiments, the portable radar device includes the L-band radar antenna of any one of the above embodiments, and also includes a radar receiver. The feed point 1 of the L-band radar antenna is connected to the radio frequency receiving channel of the radar receiver.

[0037] It can be understood that the portable radar device of this embodiment includes the L-band radar antenna of any of the above embodiments, and therefore has all the advantages of the above-mentioned L-band radar antenna. In handheld radar systems and other portable electronic devices, the design of the L-band radar antenna, using a monopole antenna made of PCB copper-clad material, has significant advantages, including but not limited to low cost, small size, and easy integration with other electronic components. These features make the L-band radar antenna very suitable for applications in handheld radar systems and other portable electronic devices, especially for scenarios requiring miniaturization and high performance, such as handheld radar devices, drone obstacle avoidance systems, intelligent transportation systems, etc., further promoting the development of fields such as wireless communications and radar detection, and bringing more convenience to people's lives.

[0038] In some embodiments of the portable radar device of the present invention, the feed point 1 of the L-band radar antenna is connected to the RF receiving channel of the radar receiver through a coaxial cable, the core end of the coaxial cable is welded to the feed point 1, and the outer periphery of the core of the coaxial cable is wrapped with a shielding cable.

[0039] It is understandable that the location and configuration of feed point 1 directly impact the antenna's impedance matching and radiation characteristics. Typically, the selection of feed point 1's location requires optimization through simulation and experimentation. Electromagnetic simulation software (such as CST MicrowaveStudio and HFSS) can be used to assist in designing and optimizing antenna performance. Simulation results can be verified through actual antenna prototype fabrication and testing, leading to further design optimization. In this embodiment, an exposed copper area is defined along the edge of the copper-clad antenna 3 of the L-band radar antenna. A coaxial cable core is soldered to this exposed copper area to form feed point 1. Feed point 1 is connected to the RF receive channel of the radar receiver circuit via the coaxial cable core. A shielded cable is wrapped around the coaxial cable core to protect signal transmission from interference from external radiated signals.

[0040] In other embodiments of the portable radar device of the present invention, a shielded grounding copper clad area 6 is further formed on the PCB 2 of the L-band radar antenna. This shielded grounding copper clad area 6 is formed on both sides of the PCB 2 and is connected to the metal housing of the radar receiver. An exposed copper area 61 is formed on the shielded grounding copper clad area 6. The shielding layer of the coaxial cable is passed through and soldered to the exposed copper area 61, thereby connecting the feed point 1 to the RF receiving channel of the radar receiver via the core of the coaxial cable.

[0041] As will be appreciated, the shielded ground copper area 6 is used to improve the circuit's electromagnetic compatibility (EMC) and signal integrity. It provides a low-impedance path, effectively shielding against external electromagnetic interference. This protects sensitive circuits from interference as the electromagnetic signal is transmitted from the feed point 1 via the coaxial cable to the radar receiver's RF receiving channel. It also provides a low-impedance return path for the signal current, thereby reducing the risk of electromagnetic radiation and reception interference. The shielded ground copper area 6 also reduces reflections on the signal line, improving signal quality and transmission speed. By providing a low-impedance return path, the shielded ground copper area 6 can reduce crosstalk between adjacent signal lines.

[0042] In some specific examples of the portable radar device of the present invention, the PCB board 2 of the L-band radar antenna and the PCB board of the radar receiver circuit can be the same PCB board. That is, the copper-clad antenna 3 of the L-band radar antenna is directly printed on the PCB board of the radar receiver circuit. The feed point 1 of the L-band radar antenna is connected to the RF receiving channel of the radar receiver circuit to collect radar signals in space and send them to the RF receiver for processing. The transmission path is short and the degree of integration is high. Signal collection, transmission and processing can be achieved in a limited space, which is conducive to the development of portable radar equipment towards smaller size.

[0043] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An L-band radar antenna, characterized in that: The invention comprises a PCB copper-clad antenna structure and a feed point (1) formed on the PCB copper-clad antenna structure. The PCB copper-clad antenna structure comprises a PCB board (2) and a copper-clad antenna (3). The copper-clad antenna (3) is printed on the PCB board (2) to form a monopole antenna. The feed point (1) is formed at the edge of the copper-clad antenna (3). The feed point (1) is used to connect to a radio frequency receiving channel of a radar receiver.

2. The L-band radar antenna according to claim 1, characterized in that: The copper-clad antenna (3) printed on the PCB board (2) is formed with a first copper-clad area (31) and a second copper-clad area (32), wherein the first copper-clad area (31) is an L-shaped structure, and the second copper-clad area (32) is a rectangular structure. A gap is formed between the first copper-clad area (31) and the second copper-clad area (32), and the feeding point (1) is constructed on an edge of the second copper-clad area (32) away from the first copper-clad area (31).

3. The L-band radar antenna according to claim 2, characterized in that: The first copper-clad area (31) comprises a rectangular copper-clad transverse portion (311) and a rectangular copper-clad longitudinal portion (312); a first gap (4) is formed between the second copper-clad area (32) and the rectangular copper-clad transverse portion (311); and a second gap (5) is formed between the second copper-clad area (32) and the rectangular copper-clad longitudinal portion (312).

4. The L-band radar antenna according to claim 3, characterized in that: The length of the rectangular copper-clad transverse portion (311) is 35 mm to 45 mm, and the width is 3 mm to 7 mm; the length of the rectangular copper-clad longitudinal portion (312) is 10 mm to 20 mm, and the width is 1 mm to 3 mm; the length of the second copper-clad area (32) is 15 mm to 25 mm, and the width is 5 mm to 10 mm; the size of the first gap (4) is 0.8 mm to 1.2 mm, and the size of the second gap (5) is 2.5 mm to 4.5 mm.

5. The L-band radar antenna according to claim 4, characterized in that: The rectangular copper-clad transverse portion (311) is 40 mm long and 5 mm wide; the rectangular copper-clad longitudinal portion (312) is 15 mm long and 2 mm wide; the second copper-clad area (32) is 20 mm long and 8 mm wide; the first gap (4) is 1 mm in size, and the second gap (5) is 3.5 mm in size.

6. A portable radar device, characterized in that: The L-band radar antenna comprises the L-band radar antenna according to any one of claims 1 to 5, and further comprises a radar receiver, wherein the feed point (1) of the L-band radar antenna is connected to a radio frequency receiving channel of the radar receiver.

7. The portable radar device according to claim 6, characterized in that The feed point (1) of the L-band radar antenna is connected to the radio frequency receiving channel of the radar receiver via a coaxial line, the core end of the coaxial line is welded to the feed point (1), and the outer periphery of the core of the coaxial line is wrapped with a shielding layer cable.

8. The portable radar device according to claim 7, characterized in that A shielding grounding copper-clad area (6) is also formed on the PCB board (2) of the L-band radar antenna. The shielding grounding copper-clad area (6) forms double-sided copper cladding on the PCB board (2). The shielding grounding copper-clad area (6) is connected to the metal housing of the radar receiver.

9. The portable radar device according to claim 8, characterized in that An exposed copper area (61) is formed on the shielded grounding copper-clad area (6), and the shielding layer cable of the coaxial line is passed through and welded to the exposed copper area (61), so that the feed point (1) and the radio frequency receiving channel of the radar receiver are connected through the core of the coaxial line.

10. The portable radar device according to claim 6, characterized in that The PCB board (2) of the L-band radar antenna and the circuit PCB board of the radar receiver use the same PCB board.

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