Folded antenna structure and wireless communication device

Abstract

The application relates to the technical field of wireless communication, and discloses a folding antenna structure and a wireless communication device, which comprise a main body, an antenna main body, an antenna rotating shaft, a radio frequency coaxial line and a coaxial welding point; a radio frequency mainboard is integrated in the main body, and the bottom of the main body is provided with the antenna rotating shaft for providing mechanical rotating support and a radio frequency conductive path; the root of the antenna main body is hingedly connected to the bottom of the main body through the antenna rotating shaft; the radio frequency coaxial line is arranged on the main body, one end of the radio frequency coaxial line is electrically connected with the radio frequency mainboard, and the other end of the radio frequency coaxial line extends to the antenna rotating shaft; wherein a wire cavity is arranged in the antenna rotating shaft to accommodate the bending allowance of the radio frequency coaxial line in the rotating process, the coaxial welding point is arranged in the wire cavity and close to the root of the antenna main body, and the other end of the radio frequency coaxial line is electrically connected with the antenna main body through the coaxial welding point. The application improves the antenna performance.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, specifically to a foldable antenna structure and a wireless communication device. Background Technology

[0002] In wireless communication, such as walkie-talkie communication, the antenna is a core component determining communication distance and signal quality. The 300-1000MHz frequency band covers UHF and part of VHF. According to electromagnetic wave propagation theory, the physical length of an antenna typically needs to be 1 / 4 or 1 / 2 of the wavelength to achieve good radiation efficiency. For example, a 1 / 4 wavelength antenna in the 400MHz band is approximately 18cm long. Therefore, to ensure communication distance and signal quality in low-frequency bands, the antenna of handheld wireless communication devices usually needs to have sufficient electrical length.

[0003] Antenna solutions for handheld wireless communication devices in related technologies mainly include fixed external antennas, helical antennas, and in-body PCB antennas. While fixed external straight antennas offer good radiation performance, their constant protrusion makes them highly susceptible to impacts, bending, and even breakage during carrying, storage, or wearing, and they also increase the overall size of the device, resulting in poor portability. Helical antennas, although able to shorten the physical size of the antenna, often sacrifice gain and bandwidth, resulting in limited radiation efficiency in the 300-1000MHz low-frequency band. In-body PCB antennas, while not protruding from the device and easy to carry, are limited by the device's size, resulting in insufficient electrical length in the low-frequency band and low radiation efficiency, making them unsuitable for long-distance communication. Summary of the Invention

[0004] In view of this, this application provides a foldable antenna structure and a wireless communication device to solve the aforementioned technical problems.

[0005] In a first aspect, embodiments of this application disclose a foldable antenna structure, including: a main body, an antenna body, an antenna pivot, a radio frequency coaxial line, and coaxial solder joints; The main body of the device integrates an RF motherboard, and the bottom of the main body of the device is provided with an antenna pivot for providing mechanical rotation support and RF conductive path; the root of the antenna body is hinged to the bottom of the main body of the device via the antenna pivot; the RF coaxial line is provided on the main body of the device, one end of which is electrically connected to the RF motherboard, and the other end extends to the antenna pivot; The antenna shaft has a wiring cavity to accommodate the bending allowance of the RF coaxial line during rotation, and the coaxial solder joint is located in the wiring cavity and close to the root of the antenna body. The other end of the RF coaxial line is electrically connected to the antenna body through the coaxial solder joint.

[0006] In one possible example, the folding antenna structure has a closed state and an unfolded state. When the folding antenna structure is in the closed state, the antenna body is attached to the fuselage body. When the folding antenna structure is in the unfolded state, the antenna body is rotated outward relative to the fuselage body through the antenna pivot.

[0007] In one possible example, the RF coaxial cable has an arc-shaped slack allowance when it runs from the body to the antenna pivot, so that when the folded antenna structure is unfolded or closed, the cable bending displacement of the RF coaxial cable can be accommodated based on the routing cavity.

[0008] In one possible example, the antenna shaft includes a metal conductive shaft and a shielding layer covering the metal conductive shaft, the shielding layer being connected to the main body of the fuselage and grounded.

[0009] In one possible example, the antenna pivot has a built-in damping structure that self-locks the unfolded or closed state of the folding antenna structure after the antenna body rotates relative to the fuselage body via the antenna pivot.

[0010] In one possible example, the antenna body is configured with a PCB antenna, FPC antenna, LDS antenna or spring antenna structure, and has a built-in matching circuit to compensate for the parasitic parameter effects caused by the folded structure.

[0011] In one possible example, the matching circuit includes an inductor-capacitor network to ensure that the resonant point of the folded antenna structure is accurate in the 300-1000MHz frequency band.

[0012] In one possible example, the radiator length of the antenna body is configured to be equal to a quarter wavelength corresponding to the center frequency of the 300-1000MHz operating frequency band; in the closed state of the folded antenna structure, the outer contour of the antenna body, which is attached to the fuselage body, matches the outer contour of the fuselage body.

[0013] Secondly, embodiments of this application disclose a wireless communication device, which includes the folded antenna structure described in any of the above embodiments.

[0014] In one possible example, the wireless communication device is a walkie-talkie, which operates in the 300-1000MHz frequency band.

[0015] In summary, compared with the prior art, this application discloses a foldable antenna structure and a wireless communication device. The foldable antenna structure, by setting an antenna pivot at the bottom of the main body and hinged the root of the antenna body to this pivot, allows the antenna body to switch between an unfolded and a closed state around the pivot. When unfolded, the radiator of the antenna body is detached from the body's obstruction, achieving the complete electrical length required for the target frequency band. When closed, the antenna body fits snugly against the body, reducing protrusion, thus balancing long-distance communication performance with portability. The antenna pivot simultaneously serves as a mechanical rotation support and a radio frequency conductive path, improving component integration and simplifying the overall structure. Furthermore, the antenna pivot... The device features an internal wiring cavity that accommodates the bending allowance of the RF coaxial cable during rotation, preventing the feeder from being subjected to rigid stretching, twisting, or compression during repeated opening and closing of the antenna, effectively preventing feeder fatigue damage. Furthermore, the coaxial solder joint is located within the wiring cavity and close to the root of the antenna body. The other end of the RF coaxial cable is electrically connected to the antenna body through this solder joint, keeping the solder joint hidden inside the rotating shaft and free from external pulling. This avoids problems such as easy oxidation of spring pins, unstable contact resistance, and easy detachment and open circuits of exposed solder joints in traditional rotating shaft feeders. It ensures stable RF impedance, low VSWR, and reliable signal transmission in the target frequency band, thereby improving the communication distance, signal quality, and long-term reliability of wireless communication equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the folded antenna structure of this application. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the claims.

[0019] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0020] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0022] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The technical solutions shown in this application will be described in detail below through specific embodiments. It should be noted that the order of description of the following embodiments is not intended to limit the priority of the embodiments.

[0024] Please refer to Figure 1 This application discloses a foldable antenna structure for use in handheld wireless communication devices such as walkie-talkies, and is particularly suitable for wireless communication devices operating in the 300-1000MHz frequency band. The foldable antenna structure includes a main body 1, an antenna body 2, an antenna hinge 3, and an RF coaxial cable 4.

[0025] In practical implementation, the main body 1 serves as the carrier for wireless communication devices such as walkie-talkies, and integrates an RF motherboard, battery, and functional circuits. The RF motherboard is used to generate and receive RF signals. An antenna hinge 3 is located at the bottom of the main body 1, providing mechanical rotation support and an RF conductive path. The base of the antenna body 2 is hinged to the bottom of the main body 1 via the antenna hinge 3, allowing the antenna body 2 to rotate relative to the main body 1 around the antenna hinge 3.

[0026] Furthermore, the RF coaxial cable 4 is mounted on the main body 1, with one end electrically connected to the RF motherboard inside the main body 1, and the other end extending to the antenna pivot 3. The antenna pivot 3 has a wiring cavity to accommodate the bending allowance of the RF coaxial cable 4 during rotation. The coaxial solder joint is located within the wiring cavity and near the root of the antenna body 2, and the other end of the RF coaxial cable 4 is electrically connected to the antenna body 2 through this solder joint. Thus, the RF signal generated by the RF motherboard is transmitted sequentially through the RF coaxial cable 4 and the coaxial solder joint to the antenna body 2, and then radiated outwards from the antenna body 2; when receiving signals, the signal path is reversed.

[0027] Therefore, based on the above embodiments, the foldable antenna structure, by setting an antenna pivot 3 at the bottom of the main body 1 and hinged the base of the antenna body 2 to the antenna pivot 3, allows the antenna body 2 to switch between an unfolded state and a closed state around the antenna pivot 3. When unfolded, the antenna radiator of the antenna body 2 is freed from the obstruction of the main body, obtaining the complete electrical length required for the target frequency band. When closed, the antenna body 2 fits snugly against the main body, reducing protrusion, thus balancing long-distance communication performance and portability. Simultaneously, the antenna pivot 3 serves the dual function of mechanical rotation support and radio frequency conductive path, improving component integration and simplifying the overall structure. Furthermore, the antenna pivot 3 contains a wiring space. The cavity can accommodate the bending allowance of the RF coaxial line 4 during rotation, avoiding the feed line from being subjected to hard stretching, twisting or squeezing when the antenna is repeatedly opened and closed, effectively preventing fatigue damage to the feed line. In addition, the coaxial solder joint is located in the wiring cavity and close to the root of the antenna body 2. The other end of the RF coaxial line 4 is electrically connected to the antenna body 2 through this coaxial solder joint, so that the solder joint is hidden inside the rotating shaft and is not pulled by the outside. This avoids the problems of easy oxidation of spring pins, unstable contact resistance, and easy desoldering and open circuit of exposed solder joints in traditional rotating shaft feeding. It ensures stable RF impedance, low VSWR and reliable signal transmission in the target frequency band, thereby improving the communication distance, signal quality and long-term reliability of wireless communication equipment.

[0028] In one example, the folding antenna structure has a closed state and an unfolded state. When the user needs to carry, store, or use it for short-term standby, the antenna body 2 can be pressed inward, causing the antenna body 2 to rotate around the antenna axis 3 until the antenna body 2 is attached to the side wall of the main body 1. At this time, the folding antenna structure is in the closed state. Figure 1The solid line in the middle shows the state when the antenna body 2 is closed. In this closed state, the antenna body 2 is completely housed within the outline of the main body 1, with no protruding parts. Therefore, it is less prone to bumps, bending, or breakage when placed in a backpack, pocket, or work clothes, effectively reducing storage volume and improving portability. When the user needs to conduct long-distance communication, the antenna body 2 can be manually pushed outward, causing it to rotate outward relative to the main body 1 via the antenna pivot 3 until it reaches the unfolding limit. At this time, the folding antenna structure is in the unfolded state. Figure 1 The dashed line shows the unfolding process of the antenna body 2. In the unfolded state, the radiator of the antenna body 2 is completely separated from the shielding of the main body 1, and can obtain the complete electrical length that meets the requirements of the 300-1000MHz low frequency band. This allows the antenna to have better radiation efficiency, antenna gain and transmit / receive sensitivity in the 300-1000MHz frequency band, significantly improving the communication distance and signal quality of wireless communication devices such as walkie-talkies. During the process of the antenna body 2 rotating from the closed state to the unfolded state or from the unfolded state to the closed state, the arc-shaped slack margin set by the RF coaxial line 4 from the inside of the main body 1 to the antenna shaft 3 can be released in the wiring cavity, avoiding the RF coaxial line 4 from being subjected to hard stretching, twisting or compression. The wiring cavity keeps the electrical connection point between the RF coaxial line 4 and the antenna body 2 hidden inside the shaft and not pulled by the outside, ensuring stable RF feed, good impedance matching and reduced VSWR.

[0029] It should be noted that the RF coaxial cable 4 has an arc-shaped slack allowance when it runs from the main body 1 to the antenna pivot 3. When the antenna body 2 expands or contracts around the antenna pivot 3, the bending displacement of the RF coaxial cable 4 is accommodated by the routing cavity, preventing the RF coaxial cable 4 from being subjected to rigid stretching, twisting, or compression. The coaxial solder joints are hidden inside the routing cavity, and external pulling does not directly act on the coaxial solder joints, thus avoiding failures such as feeder detachment, RF signal disconnection, or VSWR degradation after long-term use.

[0030] In one example, the antenna shaft 3 includes a metal conductive shaft and a shielding layer covering the metal conductive shaft. The shielding layer is connected to the main body 1 and grounded. Specifically, the shielding layer can cover the outside of the metal conductive shaft along the axial and circumferential directions. An insulating dielectric layer can be provided between the two according to the needs of radio frequency transmission, so as to maintain electrical isolation between the metal conductive shaft and the shielding layer, avoid signal short circuit, and at the same time make the shielding layer dedicated to radio frequency shielding and grounding, or make the metal conductive shaft used for mechanical support and auxiliary conduction. The shielding layer can be made of copper foil, aluminum foil, copper braided mesh, conductive cloth, conductive coating, copper plating, silver plating, or other materials with good conductivity and flexibility. It is electrically connected to the grounding terminal of the main body 1 via grounding springs, grounding rings, conductive slip rings, conductive bushings, crimp terminals, solder joints, conductive adhesive, screws, etc., thus forming a continuous, low-resistance grounding loop between the outer shielding layer of the RF coaxial cable 4, the shielding layer of the antenna shaft 3, and the grounding terminal of the main body 1. When the antenna body 2 rotates repeatedly around the antenna shaft 3 between the extended and closed states, the shielding layer can be connected via conductive slip rings, elastic grounding springs, or flexible conductive braids. The structure maintains a reliable electrical connection with the main body 1, preventing grounding resistance fluctuations, increased RF signal attenuation, deterioration of VSWR, or even open circuits caused by wear, oxidation, or insufficient contact pressure on the rotating contact surface. At the same time, after the shielding layer is grounded, it can form electromagnetic shielding for the metal conductive shaft and its internal RF coaxial line 4, suppressing electromagnetic leakage, parasitic coupling, and external interference generated at the shaft. This keeps the feed path between the inner conductor of the RF coaxial line 4 and the antenna body 2, as well as the return path between the outer shielding layer and the fuselage ground, stable, thereby achieving stable RF impedance, low VSWR, and good signal transmission quality in the 300-1000MHz frequency band.

[0031] Preferably, the bottom of the main body 1 is provided with a pivot mounting groove 11, and the antenna pivot 3 is connected in the pivot mounting groove 11. Specifically, the pivot mounting groove 11 can be provided at the end face, side wall, or bottom corner of the bottom of the main body 1, and can be integrally formed by injection molding, die casting, or machining of the shell of the main body 1. Alternatively, it can be embedded and fixed to the bottom of the main body 1 by an independent bracket. The shape of the pivot mounting groove 11 can match the shape of the antenna pivot 3, such as a U-shaped groove, a semi-circular groove, a recessed groove, or a through groove. Shaft holes, bearing seats, bushings, metal inserts, or support lugs can be provided on both sides. The two ends or the middle of the antenna pivot 3 are supported by the aforementioned shaft holes, bearing seats, or shafts. The antenna shaft 3 is securely mounted on the bottom of the main body 1, allowing the antenna body 2 to rotate around the antenna shaft 3 between the extended and closed states. The bottom or side wall of the shaft mounting groove 11 may be provided with a wiring hole, which is connected to the feed line wiring compartment inside the main body 1. The RF coaxial cable 4 is led out from the RF motherboard, passes through the feed line wiring compartment and the wiring hole, enters the shaft mounting groove 11, and then enters the wiring cavity inside the antenna shaft 3. After reserving an arc-shaped slack allowance in the wiring cavity, it is electrically connected to the antenna body 2 through the coaxial solder joint. Thus, the shaft mounting groove 11 simultaneously serves to accommodate the shaft, guide the feed line, protect the solder joint, and hide the wiring.

[0032] On the other hand, a limiting structure, such as a limiting block, a limiting protrusion, a limiting surface, or a limiting groove, can also be provided in the rotating shaft mounting groove 11. The limiting structure cooperates with the corresponding limiting part on the antenna rotating shaft 3 or the root of the antenna body 2, so that when the antenna body 2 rotates outward to the unfolded state, it is limited to a predetermined unfolding angle, and when it rotates inward to the closed state, it is limited to the storage position that fits the body body 1, preventing the antenna body 2 from rotating excessively and pulling the radio frequency coaxial cable 4 or impacting the body body 1.

[0033] Optionally, the wiring cavity can also be waterproofed and sealed to isolate the coaxial solder joints and metal conductive shaft from moisture, meeting the waterproof requirements of outdoor walkie-talkies. Specifically, a sealing structure can be provided at least at one of the following locations: the end of the wiring cavity near the main body 1, the end of the wiring cavity near the root of the antenna body 2, the mating surface of the antenna shaft 3 and the shaft mounting groove 11 of the main body 1, the mating surface of the antenna shaft 3 and the root of the antenna body 2, and the entrance of the RF coaxial cable 4 into the wiring cavity. This sealing structure can be one of the following: O-ring, lip ring, gasket, waterproof sealant, potting compound, waterproof breathable membrane, or labyrinth seal. Multiple combinations are possible. For dynamic mating parts that require relative rotation, such as between the antenna shaft 3 and the main body 1, and between the antenna shaft 3 and the antenna body 2, dynamic sealing structures such as lip seals or combined rotary seals can be used to maintain the sealed isolation between the inside of the wiring cavity and the external environment when the antenna body 2 rotates repeatedly between the unfolded and closed states. For static parts such as the entrance of the RF coaxial cable 4 into the wiring cavity and the fixed opening of the wiring cavity, static sealing structures such as waterproof sealant, potting compound, or sealing gaskets can be used to seal them, thereby forming a relatively closed waterproof space inside the wiring cavity.

[0034] Furthermore, the coaxial solder joints can be completely covered with waterproof insulating potting compound, or heat shrink tubing can be first applied around the coaxial solder joints before filling with waterproof adhesive, isolating the coaxial solder joints from external moisture, dust, and salt spray, preventing increased contact resistance, detachment, or open circuits due to oxidation, corrosion, or electrochemical migration. The surface of the metal conductive shaft can be nickel-plated, gold-plated, silver-plated, or coated with an anti-corrosion coating to improve its oxidation and corrosion resistance. If necessary, a waterproof insulating medium can be placed between the metal conductive shaft and the shielding layer to prevent short circuits or grounding resistance fluctuations caused by moisture intrusion. The interior of the wiring cavity can also be partially filled with waterproof insulating gel or waterproof potting compound, but during filling, a curved slack allowance and bending space should be reserved for the RF coaxial line 4. In addition, a waterproof breathable membrane or waterproof breathable valve can be installed at appropriate locations in the wiring cavity to prevent... While ensuring waterproofing and dustproofing, it balances the air pressure inside and outside the wiring cavity, preventing the sealing structure from failing due to temperature changes, altitude changes, or long-term use. This also prevents rainwater, sweat, condensation, dust, and sand from entering the wiring cavity. In outdoor walkie-talkies, it can maintain stable and reliable RF power supply and grounding performance in environments frequently encountered such as rain, sweat, humidity, condensation, and sandstorms. It avoids faults such as corrosion and desoldering of electrical connection points, oxidation and rust of metal conductive shafts, increased contact resistance, deterioration of VSWR, or RF signal breakage caused by moisture intrusion. At the same time, it does not affect the wiring cavity's capacity to accommodate the bending allowance of the RF coaxial cable 4, or the normal rotation and opening and closing of the antenna body 2 around the antenna axis 3. This further improves the communication distance, signal quality, and long-term reliability of 300-1000MHz band wireless communication equipment in complex outdoor environments.

[0035] In one example, the antenna pivot 3 has a built-in damping structure. After the antenna body 2 rotates relative to the main body 1 via the antenna pivot 3, the damping structure self-locks the unfolded or closed state of the folding antenna structure, preventing the antenna body 2 from wobbling when there is no external force and providing a suitable feel.

[0036] In one example, the antenna body 2 may be equipped with a PCB antenna, FPC antenna, LDS antenna or spring antenna structure, and a matching circuit is built into the antenna body 2.

[0037] Specifically, when using a PCB antenna, copper foil radiation traces, feed points, and grounding structures can be formed on a rigid printed circuit board and assembled inside the antenna body 2; When using an FPC antenna, the flexible printed circuit board can be used to attach or wrap the radiating traces to the narrow inner cavity or contoured bracket of the antenna body 2, thereby obtaining a longer equivalent electrical length in a limited space and adapting to the irregular shape or curved inner wall of the antenna mast. When using an LDS antenna, a three-dimensional radiation pattern can be formed by activating and depositing a metal layer on the surface of the plastic bracket through laser direct forming process, thereby making full use of the three-dimensional space inside the antenna and increasing the freedom of radiator design. When using a spring antenna, a metal helical spring can be used as the radiator. By adjusting the number of turns, pitch, wire diameter, and diameter of the spring, the inductance and equivalent electrical length can be changed, so that the antenna can obtain a smaller physical size and a certain bandwidth. At the same time, the spring structure also has a certain elasticity, which can resist slight impacts during carrying and opening / closing. The above-mentioned PCB antenna, FPC antenna, LDS antenna or spring antenna structure can be used individually or in combination according to frequency band and performance requirements. For example, a spring antenna can be used as the main radiator and a PCB or FPC matching branch can be set up near it, or an LDS antenna can be used to form the main radiator and a matching circuit can be integrated at its root, thereby achieving better radiation efficiency and impedance characteristics within the limited space of the antenna pole. Furthermore, the matching circuit can be located at the root of the antenna body 2 to minimize the transmission path between the matching circuit and the feed point, reducing the impact of the RF coaxial cable 4, the antenna shaft 3, and the main body 1 on the matching effect. The matching circuit may include an inductor-capacitor network, such as an L-type LC network, a π-type LC network, or a T-type LC network. The matching circuit is mainly used to compensate for the parasitic parameter effects caused by the folded structure, such as the parasitic capacitance and parasitic inductance coupling between the metal conductive shaft of the antenna shaft 3, the shielding layer, and the metal insert in the shaft mounting groove 11 and the antenna body 2, and the change in distance between the antenna body 2 and the main body 1 when switching between the unfolded and closed states. The changes in distributed capacitance caused by the bending, coiling, and displacement of the RF coaxial cable 4 within the trace cavity, as well as the interference to the near-field distribution of the antenna when the user holds the main body 1, the human body is close to the antenna body 2, or the equipment is worn on the tool, etc., can be compensated for by the above parasitic parameters. This can ensure that the resonant point of the antenna body 2 in the 300-1000MHz frequency band is accurate, the impedance matching is good, the return loss is reduced, and the VSWR is improved. This ensures that the RF energy output from the RF motherboard is fed into the antenna body 2 and radiated outward as efficiently as possible, reducing energy reflection and heat generation caused by impedance mismatch, and improving the antenna's radiation efficiency, gain, and communication distance.

[0038] In one example, the radiator length of antenna body 2 is configured to be equal to one-quarter wavelength of the center frequency of the 300-1000MHz operating band. Here, "length" can refer to either the actual physical length of the radiator or the equivalent electrical length exhibited after dielectric loading, spiral winding, serpentine routing, bending, multi-segment connection, or matching network compensation. That is, without significantly altering the external dimensions of antenna body 2, the radiator achieves an electrical length close to one-quarter wavelength at the target center frequency. Specifically, when the center frequency of the 300-1000MHz operating band is 400MHz, its free-space one-quarter wavelength is approximately 18cm, which can be used in engineering for this purpose. With cm as the design target, when the center frequency is 450MHz, its free space quarter wavelength is about 16.7cm, when the center frequency is 500MHz, its free space quarter wavelength is about 15cm, and when the center frequency is 900MHz, its free space quarter wavelength is about 8.3cm. Therefore, the corresponding center frequency can be selected according to the actual operating frequency band and the corresponding quarter wavelength can be calculated. Then, through the PCB antenna, FPC antenna, LDS antenna or spring antenna and other structural forms inside the antenna body 2, the radiator still has the equivalent electrical length to meet the low frequency radiation requirements when the physical length is less than a quarter wavelength of free space, thereby avoiding the antenna body 2 from being unable to be stored due to excessive physical length. Preferably, in the closed state of the folded antenna structure, the antenna body 2 rotates around the antenna pivot 3 and fits against the side wall of the fuselage body 1. The inner surface of the antenna body 2 can be adapted to the shape of the side wall of the fuselage body 1, for example, both are planar, slightly arc-shaped or contoured surfaces. The outer surface of the antenna body 2 is continuous with the outer contour of the fuselage body 1, so that the antenna body 2 and the fuselage body 1 together form a flat and continuous outer contour after the antenna body 2 is closed. The top of the antenna body 2 is not higher than the top of the fuselage body 1, the bottom of the antenna body 2 does not exceed the bottom of the fuselage body 1, and the width and thickness of the antenna body 2 do not exceed the width and thickness of the fuselage body 1.

[0039] Furthermore, a storage slot matching the shape of the antenna body 2 can be provided on the side wall of the main body 1, so that the antenna body 2 is at least partially embedded in the storage slot after being closed. This further makes the outer surface of the antenna body 2 flush or basically flush with the outer surface of the main body 1, and the antenna body 2 is stably kept in the closed state by magnetic attraction or limiting structure, so that the whole machine has no protruding parts, a flat shape, and is easy to carry, store, and wear with tools when closed. In the unfolded state of the folded antenna structure, the antenna body 2 extends outward relative to the main body 1 via the antenna pivot 3, and the rotation angle can be set to approximately 90° to 180° as needed.

[0040] As a result, the radiators of the antenna body 2 are completely detached from the shielding of the fuselage body 1. The unfolded antenna body 2 can be vertically upward or tilted outward, thereby obtaining the complete low-frequency radiation length, which significantly improves the radiation efficiency, antenna gain and transceiver sensitivity in the 300-1000MHz frequency band.

[0041] During the operation of the foldable antenna structure: When using for communication, manually push the antenna body 2 outward to rotate it around the antenna pivot 3 to the unfolded limit, so that the antenna body 2 is fully extended without any metal body obstruction, meeting the low-frequency radiation length requirements. The RF signal generated by the RF motherboard is transmitted to the coaxial solder joint via the RF coaxial cable 4, and then fed into the radiator of the antenna body 2 for outward radiation; during reception, the signal is transmitted in the reverse direction. When not in use, press the antenna body 2 inward to rotate it around the antenna pivot 3 and fit it against the side wall of the main body 1, so that the antenna body 2 is fully retracted, making the whole device flat and portable. During the opening and closing process, the arc-shaped slack of the RF coaxial cable 4 is released within the wiring cavity, and the coaxial solder joint is always located within the wiring cavity to avoid external force.

[0042] This application also discloses a wireless communication device, including a folded antenna structure as described in any of the above embodiments.

[0043] Among them, the wireless communication equipment can be a walkie-talkie, and the operating frequency band of the walkie-talkie is 300-1000MHz.

[0044] For other working principles and processes of the wireless communication device in this embodiment, please refer to the description of the folded antenna structure in the foregoing embodiment, which will not be repeated here.

[0045] The folding antenna structure and wireless communication device provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. It should be noted that the descriptions of each embodiment in this application have different focuses, and parts not described in detail or in a certain embodiment can be referred to the relevant descriptions of other embodiments.

[0046] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. The technical features of the technical solution of this application can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are also included within the patent protection scope of this application, as long as the combination of these technical features does not contradict each other.

[0047] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A folded antenna structure, characterized in that, include: The main body of the fuselage, the main body of the antenna, the antenna hinge, the radio frequency coaxial cable and the coaxial solder joints; The main body of the device integrates an RF motherboard, and the bottom of the main body of the device is provided with an antenna pivot for providing mechanical rotation support and RF conductive path; the root of the antenna body is hinged to the bottom of the main body of the device via the antenna pivot; the RF coaxial line is provided on the main body of the device, one end of which is electrically connected to the RF motherboard, and the other end extends to the antenna pivot; The antenna shaft has a wiring cavity to accommodate the bending allowance of the RF coaxial line during rotation, and the coaxial solder joint is located in the wiring cavity and close to the root of the antenna body. The other end of the RF coaxial line is electrically connected to the antenna body through the coaxial solder joint.

2. The folded antenna structure as described in claim 1, characterized in that, The folding antenna structure has a closed state and an unfolded state. When the folding antenna structure is in the closed state, the antenna body is attached to the fuselage body. When the folding antenna structure is in the unfolded state, the antenna body rotates outward relative to the fuselage body through the antenna pivot.

3. The folded antenna structure as described in claim 2, characterized in that, The radio frequency coaxial cable has an arc-shaped slack allowance when it runs from the body to the antenna pivot, so that when the folded antenna structure is unfolded or closed, the cable bending displacement of the radio frequency coaxial cable can be accommodated by the routing cavity.

4. The folded antenna structure as described in claim 1, characterized in that, The antenna shaft includes a metal conductive shaft and a shielding layer covering the metal conductive shaft. The shielding layer is connected to the main body of the fuselage and is grounded.

5. The folded antenna structure as described in claim 2, characterized in that, The antenna shaft has a built-in damping structure, which self-locks the unfolded or closed state of the folding antenna structure after the antenna body rotates relative to the main body through the antenna shaft.

6. The folded antenna structure as described in claim 1, characterized in that, The antenna body adopts a PCB antenna, FPC antenna, LDS antenna or spring antenna structure, and has a built-in matching circuit to compensate for the parasitic parameter effects caused by the folded structure.

7. The folded antenna structure as described in claim 6, characterized in that, The matching circuit includes an inductor-capacitor network to ensure the accurate resonant point of the folded antenna structure in the 300-1000MHz frequency band.

8. The folded antenna structure as described in claim 2, characterized in that, The radiator length of the antenna body is configured to be equal to one-quarter wavelength of the center frequency point of the 300-1000MHz operating frequency band; in the closed state of the folded antenna structure, the outer contour of the antenna body that fits against the fuselage body matches the outer contour of the fuselage body.

9. A wireless communication device, characterized in that, The wireless communication device includes the folded antenna structure as described in any one of claims 1 to 8.

10. The wireless communication device as described in claim 9, characterized in that, The wireless communication device is a walkie-talkie, and the walkie-talkie operates in the 300-1000MHz frequency band.

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