An ultra-wideband inverted-F antenna

Abstract

This invention provides an ultra-wideband inverted-F antenna, relating to the field of antenna technology, comprising an outer frame structure, a feeding structure, a connecting block, and a coaxial feed line. The upper surface of the outer frame structure has an F-shaped perforated slot, and the lower surface has a circular through-hole. The top of the feeding structure is fixedly connected to the upper top surface inside the outer frame structure. The feeding structure is a three-dimensional gradient structure, and a gap is provided between the bottom of the feeding structure and the lower bottom surface of the outer frame structure. The sidewall of the connecting block is fixedly connected to the sidewall of the feeding structure. The core wire of the coaxial feed line passes through the circular through-hole and is electrically connected to the connecting block. The ground wire of the coaxial feed line is electrically connected to the bottom of the outer frame structure. This invention achieves dual-band coverage of 0.84GHz-1GHz and 1.7GHz-85GHz, optimizes electromagnetic performance, and improves feeding efficiency and VSWR characteristics.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and more specifically, to an ultra-wideband inverted-F antenna. Background Technology

[0002] With the rapid development of wireless communication technology, the requirements for antenna performance are constantly increasing. As a key component in wireless communication systems, antennas directly affect signal transmission and reception performance and communication quality. The inverted-F antenna is a widely used antenna design in modern communication equipment. It has a compact structure, is easy to integrate, and is especially suitable for mobile communication devices. However, the design of traditional inverted-F antennas still has certain limitations in some specific application scenarios.

[0003] Traditional inverted-F antennas are typically designed for narrowband or single-band communication applications. While the operating frequency can be changed by adjusting the size of the radiating element or grounding element, achieving dual-band or ultra-wideband frequency coverage is usually limited by structural constraints, making it difficult to meet the multi-band operation requirements of modern communication systems. Many wireless communication devices need to be mounted on metal casings or metal surfaces, which places special demands on antenna design. Traditional inverted-F antennas are susceptible to uneven electromagnetic field distribution in metallic environments, leading to decreased gain, deteriorated VSWR, and frequency shift, making it difficult to meet practical application requirements. For ultra-wideband applications in modern communication systems, the traditional design of inverted-F antennas struggles to achieve large bandwidth coverage while maintaining miniaturization.

[0004] Therefore, there is an urgent need for an ultra-wideband inverted-F antenna to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-wideband inverted-F antenna to improve the aforementioned problems. To achieve this objective, the technical solution adopted by this invention is as follows:

[0006] This application provides an ultra-wideband inverted-F antenna, comprising: an outer frame structure, a feeding structure, a connecting block, and a coaxial feed line; the upper surface of the outer frame structure is provided with an F-shaped hollow slot, and the lower surface of the outer frame structure is provided with a circular through hole; the top of the feeding structure is fixedly connected to the upper top surface inside the outer frame structure, the feeding structure is a three-dimensional gradient structure, and a gap is provided between the bottom of the feeding structure and the lower bottom surface of the outer frame structure; the side wall of the connecting block is fixedly connected to the side wall of the feeding structure; the core wire of the coaxial feed line passes through the circular through hole and is electrically connected to the connecting block, and the ground wire of the coaxial feed line is electrically connected to the bottom of the outer frame structure.

[0007] Optionally, the outer frame structure is configured as a C-shape.

[0008] Optionally, the outer frame structure includes a radiating plate, grounding posts, and a grounding plate. Two grounding posts are provided, with their upper surfaces fixedly connected to the radiating plate and their lower surfaces fixedly connected to the grounding plate. The two grounding posts are arranged parallel to each other and perpendicular to the radiating plate and the grounding plate, respectively.

[0009] Optionally, the radiating plate and the grounding plate have the same length and the same width.

[0010] Optionally, the radiating plate is provided with an F-shaped perforated slot, which includes a first square perforated slot, a second square perforated slot, a third square perforated slot, and a fourth square perforated slot. The first square perforated slot and the second square perforated slot are both arranged parallel to the width direction of the radiating plate. The end of the first square perforated slot is connected to the end of the fourth square perforated slot. The two ends of the second square perforated slot are respectively connected to the third square perforated slot and the fourth square perforated slot. The third square perforated slot and the fourth square perforated slot are both arranged parallel to the length direction of the radiating plate.

[0011] Optionally, the width of the first square hollow slot is greater than the width of the second square hollow slot, the length of the first square hollow slot is less than the width of the second square hollow slot, the width of the third square hollow slot is greater than the width of the fourth square hollow slot, and the length of the third square hollow slot is less than the length of the fourth square hollow slot.

[0012] Optionally, the upper half of the power supply structure is configured as a cuboid structure, and the lower half of the power supply structure is configured as a trapezoidal structure, wherein the bottom surface of the cuboid structure and the top surface of the trapezoidal structure are on the same plane.

[0013] Optionally, the outer frame structure, power supply structure, connecting block, and coaxial feeder core wire are all all-metal structures.

[0014] Optionally, the grounding plate is disposed on a metal plane, and the bottom surface of the grounding plate is fitted to the metal plane.

[0015] Optionally, the connecting block is configured as a cuboid structure, and the bottom surface of the connecting block and the bottom surface of the power supply structure are located on the same horizontal plane.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention, through an innovative design of a three-dimensional gradient feed structure, enables the antenna to achieve dual-band coverage of 0.84GHz-1GHz and 1.7GHz-85GHz, with relative bandwidths of 17.4% and 192.16% respectively, meeting the demands of modern communications for multi-band operation. The all-metal structure endows the antenna with extremely high physical stability, adapting to harsh environments and resisting damage, making it particularly suitable for deployment on metal surfaces. Its optimized design significantly reduces interference from metallic environments, maintaining stable performance. Employing a compact modular design, the antenna is easy to integrate and fabricate. The F-shaped hollow structure on the radiating plate and the three-dimensional gradient feed method optimize electromagnetic performance, improving feed efficiency and VSWR characteristics. Furthermore, the antenna exhibits good radiation directivity and gain at different frequency points, making it suitable for mobile communications, the Internet of Things, and radar detection, demonstrating high practical value.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the ultra-wideband inverted-F antenna described in an embodiment of the present invention;

[0021] Figure 2 This is a front view schematic diagram of the ultra-wideband inverted-F antenna described in an embodiment of the present invention;

[0022] Figure 3 This is a left-side view of the ultra-wideband inverted-F antenna described in an embodiment of the present invention;

[0023] Figure 4 This is a top view schematic diagram of the ultra-wideband inverted-F antenna described in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the operating frequency band of the ultra-wideband inverted-F antenna described in an embodiment of the present invention in the range of 0.2-18 GHz;

[0025] Figure 6 This is a schematic diagram of the operating frequency band of the ultra-wideband inverted-F antenna described in an embodiment of the present invention in the range of 0.2-85GHz;

[0026] Figure 7 This is a schematic diagram of the radiation direction of the ultra-wideband inverted-F antenna described in an embodiment of the present invention at 0.9 GHz;

[0027] Figure 8 This is a schematic diagram of the radiation direction of the ultra-wideband inverted-F antenna described in an embodiment of the present invention at 3 GHz;

[0028] Figure 9 This is a schematic diagram of the radiation direction of the ultra-wideband inverted-F antenna described in an embodiment of the present invention at 6 GHz;

[0029] Figure 10 This is a schematic diagram of the radiation direction of the ultra-wideband inverted-F antenna described in an embodiment of the present invention at 18 GHz.

[0030] The markings in the diagram are: 1. Connecting block; 2. Coaxial feeder; 3. Radiation plate; 4. Grounding post; 5. Grounding plate; 6. First square hollow slot; 7. Second square hollow slot; 8. Third square hollow slot; 9. Fourth square hollow slot; 10. Cuboid structure; 11. Trapezoidal structure. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Example 1

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, this embodiment provides an ultra-wideband inverted-F antenna, including:

[0035] An outer frame structure, wherein the upper surface of the outer frame structure is provided with an F-shaped hollow slot, and the lower surface of the outer frame structure is provided with a circular through hole;

[0036] The power supply structure has its top fixedly connected to the upper top surface of the inner side of the outer frame structure. The power supply structure is a three-dimensional gradient structure, and a gap is provided between the bottom of the power supply structure and the lower bottom surface of the outer frame structure.

[0037] Connecting block 1, the side wall of which is fixedly connected to the side wall of the power supply structure;

[0038] A coaxial feeder 2, the core wire of which passes through the circular through-hole and is electrically connected to the connecting block 1, and the ground wire of the coaxial feeder 2 is electrically connected to the bottom of the outer frame structure.

[0039] Understandably, the outer frame structure, as the core support unit of the antenna, provides mechanical stability and electromagnetic interconnection paths between key antenna components through the through-hole design on its upper and lower surfaces. The F-shaped perforated slot on the upper surface is not only an important design element for the antenna's radiation characteristics, but its shape and size directly affect the resonant mode and operating frequency band of the radiating plate, effectively adjusting the operating frequency and bandwidth. The circular through-hole on the lower surface provides a path for the coaxial feed line, ensuring signal integrity during the feeding process, while optimizing the aperture design to reduce electromagnetic leakage and improve signal transmission efficiency. The feed structure adopts a three-dimensional gradient design, with the top connected to the upper surface of the outer frame structure and a certain gap reserved between the bottom and lower surfaces. This gradient structure can effectively optimize current distribution in practical applications, reduce reflection loss during high-frequency signal transmission in the antenna, and improve feeding efficiency. In addition, the gap design provides the antenna with a certain adjustment space, enabling it to adapt to the installation requirements of different metal environments, further improving the adaptability and flexibility of performance. Connecting block 1, as a bridge between the feed structure and the coaxial feed line, adopts a tightly fixed sidewall connection method, ensuring the mechanical stability of the structure and the reliability of the electrical connection. In high-frequency signal transmission, the design of the connector block directly affects the impedance matching performance of the signal. Optimizing its materials and geometry can significantly reduce insertion loss and ensure signal integrity. The core wire of coaxial feed line 2 passes through the circular through-hole of the outer frame structure and is electrically connected to the connector block, while the ground wire is connected to the bottom of the outer frame structure. This design not only achieves seamless signal transmission from the feed cable to the antenna structure but also reduces the impact of external interference on the signal through optimized cable path. The shielding layer design in the cable effectively isolates electromagnetic noise, further improving the signal transmission quality. The outer frame structure and the feed structure are manufactured as a single unit, ensuring seamless integration between them.

[0040] The outer frame structure is designed in a C-shape.

[0041] The C-shaped design of the outer frame structure understandably achieves a good balance between mechanical stability and electromagnetic performance. The C-shaped outer frame, with its F-shaped perforated slots on the upper surface and circular through-holes on the lower surface, effectively supports the antenna's core components while significantly reducing overall weight. Compared to a closed frame design, the C-shaped structure provides greater openness while maintaining strength, reducing material usage, and offering more flexibility for signal propagation and antenna tuning. In practical applications, the C-shaped frame significantly reduces the antenna's sensitivity to interference from the metallic plane. Due to its partially enclosed nature, the C-shaped structure reduces multiple reflections and resonances of electromagnetic waves within the frame, thereby mitigating the impact of parasitic effects.

[0042] The outer frame structure includes a radiating plate 3, a grounding post 4, and a grounding plate 5. There are two grounding posts 4. The top surfaces of the two grounding posts 4 are fixedly connected to the radiating plate 3, and the bottom surfaces of the two grounding posts 4 are fixedly connected to the grounding plate 5. The two grounding posts 4 are arranged parallel to each other and perpendicular to the radiating plate 3 and the grounding plate 5, respectively.

[0043] Understandably, the design of the outer frame structure achieves high mechanical strength and stability for the antenna. The combination of the radiating plate 3, grounding post 4, and grounding plate 5 constructs a complete radiation and grounding path, optimizing the electromagnetic environment for signal transmission. The parallel and vertical arrangement of the grounding post 4 reduces internal electromagnetic interference, improves the antenna's radiation efficiency and bandwidth characteristics, and enhances its mechanical durability and environmental adaptability, enabling it to maintain stable performance in various scenarios.

[0044] The radiating plate 3 and the grounding plate 5 have the same length and the same width.

[0045] It is understandable that the radiating plate 3 and the ground plane 5 have the same length and width, but the thickness of the radiating plate 3 can be set to be less than that of the ground plane 5. This design detail fully considers the requirements of the antenna's electromagnetic performance and mechanical stability. The setting of the same length and width ensures the uniformity of coupling between the radiating plate and the ground plane, which helps to form a stable electromagnetic field distribution, thereby improving the antenna's radiation efficiency and the symmetry of the radiation pattern.

[0046] The radiating plate 3 is provided with F-shaped perforated slots, which include a first square perforated slot 6, a second square perforated slot 7, a third square perforated slot 8, and a fourth square perforated slot 9. The first square perforated slot 6 and the second square perforated slot 7 are both arranged parallel to the width direction of the radiating plate 3. The end of the first square perforated slot 6 is connected to the end of the fourth square perforated slot 9. The two ends of the second square perforated slot 7 are respectively connected to the third square perforated slot 8 and the fourth square perforated slot 9. The third square perforated slot 8 and the fourth square perforated slot 9 are both arranged parallel to the length direction of the radiating plate 3.

[0047] It is understandable that the F-shaped perforated slots on the radiating plate 3 optimize the antenna's electromagnetic performance and structural layout. The F-shaped perforated slots consist of a first square perforated slot 6, a second square perforated slot 7, a third square perforated slot 8, and a fourth square perforated slot 9. The arrangement of these through-holes is closely related to the geometric orientation of the radiating plate. The first square perforated slot 6 and the second square perforated slot 7 are parallel to the width direction of the radiating plate, while the third square perforated slot 8 and the fourth square perforated slot 9 are parallel to the length direction of the radiating plate, forming an inverted F shape through their interconnection. This through-hole design achieves lightweight design while effectively controlling the surface current distribution of the radiating plate, forming a specific resonant mode, thereby extending the antenna's operating frequency band. The connection between the first square perforated slot 6 and the fourth square perforated slot 9, as well as the connection between the second square perforated slot 7 and the third and fourth square perforated slots 8 and 9, constitute the core structural feature of the inverted F antenna. Through precise geometric arrangement and dimensional design, these through-holes can guide and regulate the electromagnetic field distribution of the radiating plate, optimize the antenna matching performance, and reduce power loss.

[0048] Wherein, the width of the first square hollow slot 6 is greater than the width of the second square hollow slot 7, the length of the first square hollow slot 6 is less than the width of the second square hollow slot 7, the width of the third square hollow slot 8 is greater than the width of the fourth square hollow slot 9, and the length of the third square hollow slot 8 is less than the length of the fourth square hollow slot 9.

[0049] Understandably, this size difference effectively improves the antenna's bandwidth and frequency response, enabling it to cover multiple frequency bands simultaneously. By optimizing the size and layout of different vias, the antenna can exhibit good matching characteristics at different frequencies, reducing reflection loss and enhancing radiation efficiency. Furthermore, the size adjustment allows the antenna to provide stronger radiation capabilities within specific frequency bands, improving its overall performance, especially in multi-band or ultra-wideband applications, where it can meet complex and diverse communication needs.

[0050] The upper part of the power supply structure is configured as a cuboid structure 10, and the lower part of the power supply structure is configured as a trapezoidal structure 11. The bottom surface of the cuboid structure 10 and the top surface of the trapezoidal structure 11 are on the same plane.

[0051] It is understandable that combining the cuboid structure 10 and the trapezoidal structure 11 enhances the antenna's multi-band response, particularly in ultra-wideband applications. The upper cuboid structure ensures high-frequency stability, while the lower trapezoidal structure optimizes low-frequency response. This design not only increases the antenna's bandwidth but also effectively reduces matching losses between the feed line and the antenna, thereby improving overall radiation efficiency and signal transmission performance. This structure offers significant advantages in broadband communications, radar systems, and other high-frequency applications, meeting the demands of modern communication technologies for high-efficiency antennas.

[0052] The outer frame structure, power supply structure, connecting block 1 and coaxial feed line 2 are all made of metal.

[0053] It is understandable that the application of an all-metal structure improves the overall performance of the antenna, ensuring its stable operation in different frequency bands, while also enhancing the antenna's mechanical reliability and durability. The all-metal structure reduces energy loss by optimizing current transmission and enhances the antenna's anti-interference performance and adaptability to complex environments through its superior anti-interference capabilities. Furthermore, the all-metal structure gives the antenna better radiation efficiency and bandwidth characteristics, offering significant advantages for high-frequency applications such as ultra-wideband, broadband communication, and radar detection. The same technical effect can be achieved by making the outer frame structure, feeding structure, connecting block 1, and coaxial feed line 2 from conductive materials, or even by coating the structural surface with conductive materials. Therefore, the inner core of the outer frame structure, feeding structure, connecting block 1, and coaxial feed line 2 can be made of all-metal materials, conductive materials, or other materials coated with conductive materials. Moreover, in existing technologies, antennas mounted on metal surfaces suffer from reduced performance, while the structure in this application can be mounted on metal surfaces without weakening antenna performance.

[0054] The grounding plate 5 is disposed on a metal plane, and the bottom surface of the grounding plate 5 is fitted to the metal plane.

[0055] It is understandable that by aligning the bottom surface of the ground plane 5 with the metal plane, a more stable grounding effect is achieved, enhancing the antenna's radiation efficiency and frequency band stability. This design not only improves the antenna's electromagnetic performance but also effectively expands its operating bandwidth, making it particularly suitable for ultra-wideband applications. Combined with the metal plane, it optimizes current distribution, reduces electromagnetic wave reflection and loss, and improves the antenna's operating efficiency and signal transmission performance.

[0056] The connecting block 1 is configured as a cuboid structure 10, and the bottom surface of the connecting block 1 is located on the same horizontal plane as the bottom surface of the power supply structure.

[0057] It is understandable that the cuboid structure 10 of the connecting block 1 provides sufficient mechanical support and stability. In antenna design, connecting blocks typically serve to connect different parts, ensuring that each component maintains a fixed position and preventing poor contact or misalignment between components due to external vibration or impact. By using the cuboid structure 10, this connecting block can provide stronger structural support, avoiding antenna performance instability caused by structural looseness or instability, especially in high-frequency communication or environments with strong vibrations, maintaining the structural integrity of the entire antenna system. Secondly, the bottom surface of the connecting block 1 is on the same horizontal plane as the bottom surface of the feed structure. This design ensures that the physical connection between the connecting block 1 and the feed structure is flat and symmetrical. This ensures that there is no signal loss or reflection due to deviation in the electrical connection between the feed structure and other antenna components. Especially in high-frequency applications, the precise positioning of the feed structure is crucial. Any deviation or asymmetry may lead to uneven current conduction, thereby affecting the antenna's radiation efficiency and bandwidth performance. By ensuring the alignment of the connecting block 1 and the feed structure, electrical signals can be transmitted smoothly, ensuring the antenna's operational stability.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0059] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An ultra-wideband inverted-F antenna, characterized in that, include: An outer frame structure, wherein the upper surface of the outer frame structure is provided with an F-shaped hollow slot, and the lower surface of the outer frame structure is provided with a circular through hole; The power supply structure has its top fixedly connected to the upper top surface of the inner side of the outer frame structure. The power supply structure is a three-dimensional gradient structure, and a gap is provided between the bottom of the power supply structure and the lower bottom surface of the outer frame structure. A connecting block (1) is fixedly connected to the side wall of the power supply structure; The coaxial feed line (2) has its core wire passing through the circular through hole and electrically connected to the connecting block (1), and its ground wire is electrically connected to the bottom of the outer frame structure. The outer frame structure includes a radiating plate (3), a grounding post (4), and a grounding plate (5). There are two grounding posts (4). The top surfaces of the two grounding posts (4) are fixedly connected to the radiating plate (3) and the bottom surfaces of the two grounding posts (4) are fixedly connected to the grounding plate (5). The two grounding posts (4) are arranged parallel to each other and perpendicular to the radiating plate (3) and the grounding plate (5) respectively. The upper half of the power supply structure is configured as a cuboid structure (10), and the lower half of the power supply structure is configured as a trapezoidal structure (11). The bottom surface of the cuboid structure (10) and the top surface of the trapezoidal structure (11) are on the same plane.

2. The ultra-wideband inverted-F antenna according to claim 1, characterized in that, The outer frame structure is designed in a C-shape.

3. The ultra-wideband inverted-F antenna according to claim 1, characterized in that, The radiating plate (3) and the grounding plate (5) have the same length and the same width.

4. The ultra-wideband inverted-F antenna according to claim 1, characterized in that, The radiating plate (3) is provided with an F-shaped perforated slot, which includes a first square perforated slot (6), a second square perforated slot (7), a third square perforated slot (8) and a fourth square perforated slot (9). The first square perforated slot (6) and the second square perforated slot (7) are both arranged parallel to the width direction of the radiating plate (3). The end of the first square perforated slot (6) is connected to the end of the fourth square perforated slot (9). The two ends of the second square perforated slot (7) are respectively connected to the third square perforated slot (8) and the fourth square perforated slot (9). The third square perforated slot (8) and the fourth square perforated slot (9) are both arranged parallel to the length direction of the radiating plate (3).

5. The ultra-wideband inverted-F antenna according to claim 4, characterized in that, The width of the first square hollow slot (6) is greater than the width of the second square hollow slot (7), the length of the first square hollow slot (6) is less than the width of the second square hollow slot (7), the width of the third square hollow slot (8) is greater than the width of the fourth square hollow slot (9), and the length of the third square hollow slot (8) is less than the length of the fourth square hollow slot (9).

6. The ultra-wideband inverted-F antenna according to claim 1, characterized in that, The core wires of the outer frame structure, power supply structure, connecting block (1) and coaxial feed line (2) are all made of metal.

7. The ultra-wideband inverted-F antenna according to claim 1, characterized in that, The grounding plate (5) is disposed on the metal plane, and the bottom surface of the grounding plate (5) is attached to the metal plane.

8. The ultra-wideband inverted-F antenna according to claim 1, characterized in that, The connecting block (1) is configured as a cuboid structure (10), and the bottom surface of the connecting block (1) is on the same horizontal plane as the bottom surface of the power supply structure.

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