Split type log-periodic antenna

Abstract

The invention discloses a split type log-periodic antenna, which comprises a connecting seat, a main rod, a plurality of oscillator mounting seats, a plurality of oscillators and a coaxial cable, and is characterized in that the connecting seat is provided with a connecting hole; the main rod is mounted on the connecting seat, and a first mounting cavity is formed in the main rod; the plurality of vibrator mounting seats are mounted on the main rod at equal intervals according to a logarithmic periodic rule; the vibrators are detachably mounted on the corresponding vibrator mounting seats; the coaxial cable penetrates through the connecting base to be installed in the first installation cavity, the coaxial cable is connected with a radio frequency connector, the radio frequency connector is suitable for being connected with external radio frequency equipment, and a stepped phase delay network is formed between a feeding point of the radio frequency connector and all the oscillators through the coaxial cable. The structure can be optimized through detachable modular design, the packaging and transportation cost is reduced, and meanwhile the broadband performance is kept stable.

Description

Technical Field

[0001] This invention relates to a split-type log-periodic antenna, belonging to the field of antenna technology. Background Technology

[0002] A log-periodic antenna is a non-frequency-variable antenna whose electrical characteristics, such as impedance, radiation pattern, gain, and VSWR, vary periodically with the logarithm of the frequency and remain essentially constant over a wide frequency band. The antenna consists of dipoles whose length and spacing increase in a log-periodic ratio, with each dipole corresponding to a specific frequency band. Wideband continuous radiation is achieved through phase control. This structure allows it to maintain impedance matching and radiation characteristics over a wide frequency range, and to maintain high gain and directivity across multiple frequency bands, thus making it widely used in various communication fields. The main structural components of existing log-periodic antennas include a main mast and multiple radiating elements, whose lengths and spacing follow a log-periodic pattern. The length ratio and spacing ratio of adjacent elements are constants, commonly referred to as the "log-periodic ratio." This structural design allows the antenna to maintain stable performance over a wide bandwidth. Elements of different lengths are alternately distributed on the main mast, and the arrangement of the elements is typically trapezoidal. This arrangement helps to utilize space effectively and allows for convenient adjustment of the antenna's directivity.

[0003] Currently, most log-periodic antenna elements on the market are integrated, resulting in a large size that occupies significant space during storage. Furthermore, the multi-element structure of these antennas makes them inconvenient to package and transport, increasing their susceptibility to damage and thus raising packaging and transportation costs. In short, current log-periodic antennas suffer from drawbacks such as large size, inconvenience in storage and transport, and high packaging and transportation costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a split log-periodic antenna that can optimize the structure through a detachable modular design, reduce packaging and transportation costs, and maintain stable wideband performance.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is to overcome the defects of the prior art and provide a split-type log-periodic antenna, comprising: Connecting seat, the connecting seat is provided with connecting hole; The main rod is mounted on the connecting seat, and the main rod has a first mounting cavity. Multiple oscillator mounting seats are installed on the main rod at equal intervals according to a logarithmic periodic law; Multiple oscillators, wherein the oscillators are detachably mounted on corresponding oscillator mounting bases; A coaxial cable passes through the connector and is installed in the first mounting cavity. An RF connector is connected to the coaxial cable. The RF connector is adapted to connect to an external RF device. The feed point of the RF connector and each oscillator form a stepped phase delay network through the coaxial cable.

[0006] Furthermore, the length of the oscillator decreases logarithmically along the extension direction of the main rod.

[0007] Furthermore, in order to achieve quick assembly and disassembly, the oscillator mounting base is connected to the oscillator through a disassembly locking structure; The disassembly and locking structure includes a connecting rod and a connecting sleeve. One end of the connecting sleeve is provided with a first cover and a first connecting through hole. The first cover is provided with a second connecting through hole, and the diameter of the first connecting through hole is larger than the diameter of the second connecting through hole. The vibrator has a second mounting cavity, and one end of the connecting rod has a second cover. The second cover is integrally formed with the connecting rod, and the diameter of the second cover is larger than the diameter of the second connecting through hole. The connecting rod is adapted to pass through the second connecting through hole so that the second cover abuts against the first cover, thereby driving the connecting sleeve to be installed on the vibrator.

[0008] Furthermore, in order to reduce installation errors, the small end diameter of the connecting rod is equal to the inner diameter of the second mounting cavity, and the small end of the connecting rod is adapted to be inserted into the second mounting cavity.

[0009] Furthermore, to enhance installation stability, the disassembly locking structure also includes at least one fastener; The outer wall of the vibrator is provided with a first connecting hole, which communicates with the second mounting cavity. The connecting rod is provided with a second connecting hole. The fastener is adapted to pass through the first connecting hole and be screwed into the second connecting hole so that the small end of the connecting rod forms a radial compression fixation with the second mounting cavity.

[0010] Furthermore, in order to extend the service life, the head of the fastener is provided with anti-slip texture, and an elastic gasket is provided between the contact surface of the fastener and the outer wall of the vibrator.

[0011] Furthermore, to improve installation efficiency, a connecting cavity is provided between the first connecting through hole and the second connecting through hole. The inner wall of the connecting cavity is provided with an internal thread, and the outer wall of the vibrator mounting base is provided with an external thread. The connecting sleeve is connected and fixed to the external thread of the vibrator mounting base through the internal thread.

[0012] Furthermore, one end of the coaxial cable is electrically connected to an external power supply system.

[0013] After adopting the above technical solution, the present invention has the following beneficial effects: In this invention, the bottom end of the main rod is aligned with the mounting interface of the connector to ensure that the first mounting cavity inside the main rod and the connecting hole of the connector are coaxially connected. According to the logarithmic periodic law, the position of the oscillator mounting seat is marked at equal intervals in the extension direction of the main rod. Insert the large end of the connecting rod into the second connecting through hole of the connecting sleeve, push the vibrator to make the second stop cover fit with the first stop cover of the sleeve. At this time, the limiting structure of the connecting rod can prevent the vibrator from coming out, and complete the quick locking. Screw the internal thread end of the connecting sleeve into the external thread part of the vibrator mounting base and tighten it so that the first cover fits against the surface of the vibrator mounting base; Then, use fasteners to pass through the first connecting hole on the outer wall of the oscillator and screw them into the corresponding second connecting hole of the connecting rod. Apply radial clamping force to fix them. Elastic shims can be added as needed when tightening, and anti-slip tools can be used to tighten them to prevent loosening. The coaxial cable is inserted into the first mounting cavity of the main rod through the connection hole and laid along the extension direction of the main rod to the end; the end of the coaxial cable is connected to the RF connector and fixed to the port of the connector by welding or crimping to ensure compatibility with external RF equipment; Finally, check that all the oscillator lengths are arranged in logarithmic decreases in the direction of the main rod extension, confirm that the installation sequence is correct, and use RF testing equipment to connect the RF connector to verify the antenna's VSWR and bandwidth performance to ensure stable signal transmission. Attached Figure Description

[0014] Figure 1 This is a perspective view of a split-type log-periodic antenna according to the present invention; Figure 2 This is a schematic diagram of the structure of a split-type log-periodic antenna according to the present invention; Figure 3 This is a schematic diagram showing the connection between the main rod, the vibrator mounting base, and the vibrator of the present invention. Figure 4 This is a schematic diagram showing the connection of the oscillator mounting base, connecting rod, connecting sleeve, and fasteners of the present invention. Figure 1 ; Figure 5 This is a schematic diagram showing the connection of the oscillator mounting base, connecting rod, connecting sleeve, and fasteners of the present invention. Figure 2 ; Figure 6 This is a full cross-sectional view of the connecting sleeve of the present invention. Detailed Implementation

[0015] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] like Figure 1-6 As shown, a split-type log-periodic antenna includes: Connector 1, connector 1 is provided with a connecting hole; Main rod 2 is mounted on connecting seat 1, and a first mounting cavity is provided in main rod 2; Multiple oscillator mounting bases 3 are installed on the main rod 2 at equal intervals according to a logarithmic periodic law; Multiple oscillators 4 are detachably mounted on corresponding oscillator mounting bases 3; A coaxial cable 5 passes through the connector 1 and is installed in the first mounting cavity. An RF connector is connected to the coaxial cable 5. The RF connector is suitable for connection with external RF equipment. The feed point of the RF connector and each oscillator 4 form a stepped phase delay network through the coaxial cable 5.

[0017] In this embodiment, the main rod 2 is integrally molded from carbon fiber composite material, with an axial bending strength ≥800MPa and a weight reduction of 40% compared to aluminum alloy; The surface of the oscillator 4 is coated with a 20-50μm ceramic layer using a plasma electrolytic oxidation process. It showed no corrosion after a 48-hour salt spray test, ensuring long-term stability in the field.

[0018] Specifically, such as Figure 1 As shown, the length of the oscillator 4 decreases logarithmically along the extension direction of the main rod 2.

[0019] Specifically, such as Figure 1-6 As shown, the mounting base for the oscillator 4 is connected to the oscillator 4 via a disassembly and locking structure; The disassembly and locking structure includes a connecting rod 61 and a connecting sleeve 62. One end of the connecting sleeve 62 is provided with a first cover 621 and a first connecting through hole 622. The first cover 621 is provided with a second connecting through hole 623. The diameter of the first connecting through hole 622 is larger than the diameter of the second connecting through hole 623. The vibrator 4 is provided with a second mounting cavity 41, and one end of the connecting rod 61 is provided with a second cover 612. The second cover 612 is integrally formed with the connecting rod 61, and the diameter of the second cover 612 is larger than the diameter of the second connecting through hole 623. The connecting rod 61 is adapted to pass through the second connecting through hole 623 so that the second cover 612 abuts against the first cover 621, thereby driving the connecting sleeve 62 to be installed on the vibrator 4.

[0020] Specifically, such as Figure 5 As shown, the vibrator 4 is provided with a second mounting cavity 41, and the small end diameter of the connecting rod 61 is equal to the inner diameter of the second mounting cavity 41. The small end of the connecting rod 61 is suitable for insertion into the second mounting cavity 41.

[0021] Specifically, such as Figure 4-5 As shown, the disassembly locking structure also includes at least one fastener 63; The outer wall of the vibrator 4 is provided with a first connecting hole 42, which is connected to the second mounting cavity 41. The connecting rod 61 is provided with a second connecting hole 611. The fastener 63 is adapted to pass through the first connecting hole 42 and be screwed into the second connecting hole 611 so that the small end of the connecting rod 61 is radially pressed and fixed with the second mounting cavity 41.

[0022] Specifically, the head of the fastener 63 is provided with anti-slip texture, and an elastic gasket is provided between the contact surface of the fastener 63 and the outer wall of the vibrator 4.

[0023] Specifically, such as Figure 4-5 As shown, a connecting cavity 624 is provided between the first connecting through hole 622 and the second connecting through hole 623. The inner wall of the connecting cavity 624 is provided with an internal thread, and the outer wall of the vibrator mounting base 3 is provided with an external thread. The connecting sleeve 62 is connected and fixed to the external thread of the vibrator mounting base 4 through the internal thread.

[0024] In this embodiment, during assembly, high-temperature resistant thread-locking adhesive is pre-applied to the internal thread of the connecting sleeve 62 to prevent loosening of the threads due to vibration; at the same time, an annular groove is machined on the back of the first cover 621 to embed an O-ring, thereby achieving secondary anti-loosening and IP67 waterproof rating.

[0025] Specifically, one end of the coaxial cable 5 is electrically connected to the external power supply system.

[0026] In this embodiment, the bottom end of the main rod 2 is aligned with the mounting interface of the connecting seat 1 to ensure that the first mounting cavity inside the main rod 2 and the connecting hole of the connecting seat 1 are coaxially connected. According to the logarithmic periodic law, the position of the oscillator mounting seat 3 is marked at equal intervals in the extension direction of the main rod 2. Insert the large end of the connecting rod 61 into the second connecting through hole 623 of the connecting sleeve 62, and push the vibrator 4 to make the second cover fit with the first cover 621 of the sleeve. At this time, the limiting structure of the connecting rod 61 can prevent the vibrator 4 from coming out, thus completing the quick locking. Screw the internal thread end of the connecting sleeve 62 into the external thread portion of the vibrator mounting base 3 and tighten it so that the first cover 621 fits against the surface of the vibrator 4 mounting base; Then, fastener 63 is passed through the first connecting hole 42 on the outer wall of vibrator 4 and screwed into the second connecting hole 611 corresponding to connecting rod 61. Radial clamping force is applied to fix it. Elastic shims can be added as needed when tightening, and anti-slip tools are used to tighten it to prevent loosening. The coaxial cable 5 is inserted into the first mounting cavity of the main rod 2 through the connection hole and laid to the end along the extension direction of the main rod 2; the end of the coaxial cable 5 is connected to the RF connector and fixed to the port of the connector 1 by welding or crimping to ensure compatibility with external RF equipment; Finally, check that the lengths of all the vibrators 4 are arranged in a logarithmic decreasing order along the extension direction of the main rod 2 to confirm that the installation sequence is correct. Use RF testing equipment to connect the RF connector to verify the antenna's VSWR and bandwidth performance to ensure stable signal transmission.

[0027] The above specific embodiments further illustrate the technical problems solved by the present invention, the technical solutions, and the beneficial effects. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. This invention discloses a split-type log-periodic antenna, comprising a connector, a main rod, multiple element mounting bases, multiple elements, and a coaxial cable. The connector has a connection hole; the main rod is mounted on the connector and has a first mounting cavity; the multiple element mounting bases are mounted on the main rod at equal intervals according to a log-periodic law; the elements are detachably mounted on their corresponding element mounting bases; the coaxial cable passes through the connector and is mounted in the first mounting cavity, and an RF connector is connected to the coaxial cable. The RF connector is suitable for connection to external RF equipment, and the feed point of the RF connector and each element form a stepped phase delay network through the coaxial cable. It can optimize the structure through a detachable modular design, reduce packaging and transportation costs, while maintaining stable wideband performance.

2. A split-type log-periodic antenna according to claim 1, characterized in that: The length of the oscillator (4) decreases logarithmically along the extension direction of the main rod (2).

3. A split-type log-periodic antenna according to claim 1, characterized in that: The mounting base of the vibrator (4) is connected to the vibrator (4) through a disassembly and locking structure; The disassembly and locking structure includes a connecting rod (61) and a connecting sleeve (62). One end of the connecting sleeve (62) is provided with a first cover (621) and a first connecting through hole (622). The first cover (621) is provided with a second connecting through hole (623). The diameter of the first connecting through hole (622) is larger than the diameter of the second connecting through hole (623). The vibrator (4) is provided with a second mounting cavity (41), and one end of the connecting rod (61) is provided with a second cover (612). The second cover (612) is integrally formed with the connecting rod (61), and the diameter of the second cover (612) is larger than the diameter of the second connecting through hole (623). The connecting rod (61) is adapted to pass through the second connecting through hole (623) so that the second cover (612) abuts against the first cover (621), thereby driving the connecting sleeve (62) to be installed on the vibrator (4).

4. A split-type log-periodic antenna according to claim 3, characterized in that: The small end diameter of the connecting rod (61) is equal to the inner diameter of the second mounting cavity (41), and the small end of the connecting rod (61) is adapted to be inserted into the second mounting cavity (41).

5. A split-type log-periodic antenna according to claim 4, characterized in that: The disassembly locking structure also includes at least one fastener (63). The vibrator (4) has a first connecting hole (42) on its outer wall. The first connecting hole (42) is connected to the second mounting cavity (41). The connecting rod (61) has a second connecting hole (611). The fastener (63) is adapted to pass through the first connecting hole (42) and be screwed into the second connecting hole (611) so that the small end of the connecting rod (61) is radially pressed and fixed with the second mounting cavity (41).

6. A split-type log-periodic antenna according to claim 5, characterized in that: The head of the fastener (63) is provided with anti-slip texture, and an elastic gasket is provided between the contact surface of the fastener (63) and the outer wall of the vibrator (4).

7. A split-type log-periodic antenna according to claim 3, characterized in that: A connecting cavity (624) is provided between the first connecting through hole (622) and the second connecting through hole (623). The inner wall of the connecting cavity (624) is provided with an internal thread, and the outer wall of the vibrator (4) mounting base is provided with an external thread. The connecting sleeve (62) is connected and fixed to the external thread of the vibrator (4) mounting base through the internal thread.

8. A split-type log-periodic antenna according to claim 1, characterized in that: One end of the coaxial cable (5) is electrically connected to the external power supply system.

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