Anti-vibration near field coupling telemetry antenna device and integrated implementation method

Abstract

The application discloses an anti-vibration near-field coupling telemetry antenna device and an integrated implementation method. The device comprises a transmitting antenna system component and a receiving antenna system component; the transmitting antenna system component is a rotating component, comprising a metal inner concave trapezoidal groove structure, a transmitting antenna PCB substrate, a transmitting antenna and transmitting antenna potting glue; the receiving antenna system component is a static component, comprising a metal outer concave trapezoidal groove structure, a receiving antenna PCB substrate, a receiving antenna and receiving antenna potting glue. Signals are transmitted between the transmitting antenna and the receiving antenna through a capacitive near-field coupling mode. The self-locking effect formed by the trapezoidal groove structure and the potting glue resists high centrifugal force, the frequency margin is configured through an accurate capacitive calculation model to ensure signal stability, and reliable grounding is realized through a heterogeneous metal spot welding process, so that the problems of easy falling off of the antenna and unstable signals in a high-temperature and high-centrifugal-force environment of an engine are solved.

Description

Technical Field

[0001] This invention relates to the field of wireless signal transmission technology in non-contact measurement of rotating parts, specifically to an anti-vibration near-field coupling telemetry antenna device and its integrated implementation method for use in rotating engine machinery. Background Technology

[0002] Signal transmission is a key technology for testing the parameters of rotating components in aero-engines, and is generally achieved through telemetry or electro-optical transmitters. Telemetry, due to its advantages such as being non-contact, interference-resistant, and requiring no complex cooling structures, is gradually replacing the traditional electro-optical signal transmission method. The telemetry antenna, as a crucial component for transmitting data collected by the transmitter on the rotating component through space to the ground receiver, directly affects the quality of signal transmission.

[0003] In applications such as high-pressure compressor dynamic stress measurement of aero-engines, the low-pressure rotor obstructs the signal transmission, preventing the telemetry rotor-stator components from being mounted on the high-pressure shaft end. Therefore, the antenna must be mounted around the shaft. This mounting location presents significant challenges in terms of space constraints, high temperature, and high centrifugal force, posing substantial difficulties for the design and fabrication of telemetry antennas. Antennas fabricated using conventional microstrip antenna design methods are prone to poor signal reception, severe data loss, and even antenna adhesive detachment under the high temperature, high centrifugal force, and vibration conditions of engine operation, failing to meet the testing requirements under complex engine operating conditions.

[0004] Existing technologies include telemetry or transmission devices for rotating engine components, primarily focusing on the overall layout and structural adaptability of the telemetry system. Modular design or adapter structures are used to improve installation space adaptability. However, these solutions typically use planar adhesive bonding to fix the antenna to the structural surface. Under the immense centrifugal force generated by the high-speed rotation of the engine, the antenna and its encapsulating adhesive are highly susceptible to peeling or detachment from the bonding interface, leading to signal transmission interruption. Furthermore, existing designs often neglect the dielectric properties of the encapsulating adhesive and the impact of axial thermal expansion and contraction of the engine on the antenna capacitance, causing the actual operating frequency of the antenna to deviate from the design value, resulting in signal attenuation or even loss of lock. Therefore, existing technologies still have significant shortcomings in terms of antenna anti-centrifugal force detachment structures and precise frequency configuration. Summary of the Invention

[0005] The purpose of this invention is to provide a vibration-resistant near-field coupling telemetry antenna device and its integrated implementation method, so as to solve the problems of antennas easily falling off and unstable signal transmission in the prior art under the high temperature and high centrifugal force environment of engines, and to realize reliable signal transmission in the measurement of rotating parts parameters.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a vibration-resistant near-field coupling telemetry antenna device, comprising a transmitting antenna system component and a receiving antenna system component.

[0008] The transmitting antenna system component is a rotating part, including a metal concave trapezoidal groove structure, a transmitting antenna PCB substrate, a transmitting antenna, and a transmitting antenna potting compound. The metal concave trapezoidal groove structure has a concave mounting groove with a trapezoidal cross-section, the groove opening width being smaller than the groove bottom width, forming a sloping sidewall. The transmitting antenna PCB substrate is fixed to the concave surface of the metal concave trapezoidal groove structure using adhesive. The transmitting antenna is mounted on the transmitting antenna PCB substrate. The transmitting antenna potting compound fills the remaining portion of the concave cavity of the metal concave trapezoidal groove structure, encapsulating the transmitting antenna PCB substrate and the transmitting antenna as a single unit. The design of this concave trapezoidal groove structure utilizes the sloping surface to form a self-locking mechanism under centrifugal force, effectively preventing the potting compound and antenna board from detaching during high-speed rotation.

[0009] The receiving antenna system component is a stator component, including a metal concave trapezoidal slot structure, a receiving antenna PCB substrate, a receiving antenna, and a receiving antenna potting compound. The metal concave trapezoidal slot structure has a concave mounting groove with a trapezoidal cross-section, the groove opening being wider than the bottom, forming a sloping sidewall. The receiving antenna PCB substrate is fixed to the concave surface of the metal concave trapezoidal slot structure using adhesive. The receiving antenna is mounted on the receiving antenna PCB substrate. The receiving antenna potting compound fills the remaining portion of the concave cavity of the metal concave trapezoidal slot structure, encapsulating the receiving antenna PCB substrate and the receiving antenna as a single unit. This concave trapezoidal slot structure uses the same trapezoidal cross-section design as the inward concave trapezoidal slot structure, and similarly utilizes the self-locking effect of the sloping surface to resist vibration and thermal expansion and contraction, ensuring long-term antenna reliability.

[0010] The transmitting antenna and the receiving antenna transmit signals via capacitive near-field coupling, and both the transmitting antenna system component and the receiving antenna system component are conformally encapsulated with the engine structure using transmitting antenna potting compound and receiving antenna potting compound, respectively.

[0011] Furthermore, both the transmitting antenna and the receiving antenna are annular copper sheets arranged around an axis, forming capacitively coupled plates. Their ideal capacitance value... The dielectric constant of the medium is determined by the antenna geometry, the distance between the electrodes, and the dielectric constant of the medium, specifically by the following formula:

[0012] in, Let L be the dielectric constant of the medium between the plates, and L be the axial length. R1 is the antenna coverage angle, R2 is the radius of the transmitting antenna, and R2 is the radius of the receiving antenna.

[0013] Furthermore, due to the presence of potting compound on both the transmitting and receiving antennas, the actual capacitance value... The thickness and dielectric constant of the potting compound need to be considered, and are determined by the following formula:

[0014] in, d1 is the dielectric constant of the potting compound for the transmitting antenna, and d2 is the thickness of the potting compound for the transmitting antenna. Where is the dielectric constant of air. d1 represents the dielectric constant of the potting compound for the receiving antenna, and d2 represents the thickness of the potting compound. By introducing this corrective formula, this invention ensures the accuracy of the antenna design and avoids frequency shifts caused by neglecting the influence of the potting compound.

[0015] Furthermore, to address potential axial movement during engine operation, when the axial movement is L1, the capacitance value... Determined by the following formula:

[0016] The cutoff frequency of the high-pass filter composed of the transmitting antenna and the receiving antenna Determined by the following formula:

[0017] Where R is the matching resistor, and the axial length and coverage angle of the antenna are configured such that, within the expected axial sway range, the cutoff frequency... The frequency is lower than the operating frequency of the telemetry system, while retaining a frequency margin of more than 20%. This precise frequency margin design ensures that even when the engine moves axially, the signal transmission channel remains within the passband, without signal attenuation or interruption, thus significantly improving the stability of signal transmission.

[0018] Furthermore, the device also includes a grounding connection structure comprising a high-temperature alloy sheet and a copper sheet. The high-temperature alloy sheet is resistively spot-welded to the grounding point of the engine's titanium metal structure, and the material of the high-temperature alloy sheet is GH3030. The copper sheet is resistively spot-welded to the high-temperature alloy sheet. The outer shielding ground wire of the antenna lead is soldered to the copper sheet. This structure, by introducing GH3030 as an intermediate material, solves the problem of the large difference in melting points between copper and titanium, which prevents direct spot welding, while avoiding damage caused by drilling or high-temperature welding on the titanium alloy, thus ensuring the structural strength of the rotor components. This grounding connection maintains low resistance even under high temperature and vibration environments, ensuring the stability of the signal reference ground.

[0019] In a second aspect, the present invention provides an integrated implementation method for a vibration-resistant near-field coupled telemetry antenna device, used to manufacture the device described in the first aspect, comprising the following steps: Structural adhesive is used to bond the transmitting antenna PCB substrate and the receiving antenna PCB substrate to the grooves of the metal inner concave trapezoidal groove structure and the metal outer concave trapezoidal groove structure, respectively. Solder the RF leads to the antenna feed point and solder a matching resistor to the receiving antenna; The grounding connection of the antenna system is achieved by combining dissimilar metal spot welding and soldering. Structural adhesive is used to bond and fix the RF leads to prevent them from shaking during high-speed rotation; After vacuum mixing of the potting compound, it is poured into the antenna slot to eliminate air bubbles and ensure potting quality. After the potting compound has fully cured, the surface of the compound is machined to make it flush with the structural plane and polished smooth, so as to achieve conformal integration between the antenna and the structure.

[0020] Furthermore, the step of grounding the antenna system by combining dissimilar metal spot welding and soldering specifically includes: firstly, resistively spot welding the GH3030 high-temperature alloy thin film to the grounding point at the titanium alloy grounding point of the engine component; then resistively spot welding the copper film to the GH3030 high-temperature alloy thin film; and finally soldering the outer shielding ground wire of the antenna lead to the copper film.

[0021] Furthermore, the potting compound is 985FR epoxy resin, which has excellent high temperature resistance and vibration resistance.

[0022] Furthermore, before the step of bonding the transmitting antenna PCB substrate and the receiving antenna PCB substrate to the grooves of the metal concave trapezoidal groove structure and the metal convex trapezoidal groove structure respectively using structural adhesive, for the receiving antenna system component, a grounding copper pin is pre-prepared at the resistance grounding point using a dissimilar metal spot welding process before bonding the receiving antenna PCB substrate. The grounding copper pin is used to solder to the receiving antenna grounding point after the substrate is bonded to ensure reliable grounding.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention employs a concave trapezoidal slot structure for the transmitting antenna system component and an externally concave trapezoidal slot structure for the receiving antenna system component. Both have a trapezoidal cross-section with a narrow opening and a wide base, utilizing the self-locking effect of the trapezoidal slope. For the transmitting antenna (rotor component), centrifugal force during high-speed rotation causes the potting compound and antenna plate to adhere tightly to the slope. Due to the narrow opening and wide base, the potting compound is trapped within the slot and cannot be removed, allowing it to withstand centrifugal forces up to 30,000g. For the receiving antenna (stator component), the self-locking effect of the trapezoidal slope is similarly utilized to resist vibration and thermal expansion and contraction, ensuring long-term antenna reliability.

[0024] 2. This invention uses a precise capacitance calculation model to comprehensively consider the influence of the dielectric constant and thickness of the potting compound and the axial movement of the engine on the capacitance. The cutoff frequency of the high-pass filter composed of the antenna is configured to be lower than the operating frequency with a margin of more than 20%, ensuring uninterrupted signal transmission and low packet loss under harsh operating conditions.

[0025] 3. This invention uses high-temperature resistant 985FR epoxy resin as the potting material and eliminates air bubbles through a vacuum potting process, ensuring the resin's stable performance and preventing failure at high temperatures. Furthermore, it employs a dissimilar metal spot welding process using GH3030 high-temperature alloy as the intermediate material, achieving a reliable electrical connection between the copper conductor and the titanium alloy structure. This avoids damage to the titanium alloy caused by direct welding and provides a high connection strength and vibration resistance.

[0026] 4. This invention forms a complete integrated method from bonding, welding, spot welding, potting to machining, ensuring the consistency and reliability of the antenna device, and is suitable for engineering mass production. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the signal transmission of the telemetry system in an embodiment of the present invention; Figure 2 This is a schematic diagram of the antenna structure location in an embodiment of the present invention, wherein (a) is a schematic diagram of the antenna installation location of the high-pressure rotor component of the engine, and (b) is a schematic diagram of the antenna; Figure 3 This is a schematic diagram of the near-field coupling principle of the antenna capacitor in an embodiment of the present invention, wherein (a) is a schematic diagram of the coupling of the antenna capacitor plates, and (b) is a schematic diagram of the circuit composition; Figure 4 This is a cross-sectional view of the antenna system on the engine structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the transmitting antenna interface in an embodiment of the present invention; Figure 6 This is a schematic diagram of the receiving antenna interface in an embodiment of the present invention, where (a) is the matching resistor connection point and (b) is the signal line interface connection point.

[0029] Explanation of key markings in the attached diagram: 1-Transmitting antenna system component; 2-Receiving antenna system component; 11-Metal concave trapezoidal slot structure; 12-Transmitting antenna PCB substrate; 13-Transmitting antenna; 14-Transmitting antenna potting compound; 15-Transmitting antenna slot; 16-Transmitting antenna lead; 17-Transmitting antenna feed point; 18-Transmitting antenna signal ground point; 19-First lead slot; 20-Transmitter; 21-Metal external concave trapezoidal slot structure; 22-Receiving antenna PCB substrate; 23-Receiving antenna; 24-Receiving antenna potting compound; 25-Receiving antenna slot; 26-Receiving antenna lead; 27-Receiving antenna feed point; 28-Receiving antenna signal ground point; 29-Second lead slot; 30-Resistor ground point; 31-Matching resistor. Detailed Implementation

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] This invention provides a detailed description of an anti-vibration near-field coupling telemetry antenna device and its integrated implementation method, using the implementation of a high-pressure compressed air dynamic stress measurement telemetry antenna device for an engine as an example.

[0033] I. Overall Architecture of the Telemetry System like Figure 1 As shown, the electrical signals from the sensors of the engine rotating components are transmitted to the transmitter for acquisition and processing via leads. The electrical signals are then converted into radio frequency (RF) signals and transmitted to the rotor via RF lines, where they are propagated by the transmitting antenna on the rotor. The transmitter and rotor constitute the engine rotating components. The receiving antenna on the engine stator (stator component) receives the RF signals propagating in space, converts them into electrical signals, and transmits them to the ground receiver for processing and storage via RF lines. The core of this invention lies in providing a vibration-resistant near-field coupling telemetry antenna device and its integration method adapted to such harsh environments.

[0034] II. Antenna Structure Design and Near-Field Coupling Principle In this embodiment of the invention, the high-pressure compressor stress measurement of the entire engine uses four transmitter modules, thus requiring the design of four radio frequency transmitting antennas and one receiving antenna. For example... Figure 2 As shown, to enable the receiving antenna to simultaneously receive signals from multiple transmitting antennas during rotation, the receiving antenna 23 forms a loop antenna around the axis and is installed in the receiving antenna slot 25. The receiving antenna slot 25 is connected to the receiving antenna lead 26. The four transmitting antennas 13 are installed in the corresponding transmitting antenna slots 15 around the axis. The transmitter 20 is connected to the transmitting antenna slot 15 through the transmitting antenna lead 16. Figure 2 As shown in (a) above; the top view of transmitting antenna 13 and receiving antenna 23 is shown below. Figure 2 As shown in (b) of the diagram.

[0035] Since the engine's rotating and stator components are connected via bearings and belong to the same potential, capacitive coupling is used for near-field coupling. For example... Figure 3 As shown, the copper plates of the transmitting antenna and the receiving antenna form capacitor plates, as... Figure 3 As shown in (a), the signal ground is connected to the metal to form a high-pass filter; Figure 3 In (a), L is the axial length. R1 is the radius of the transmitting antenna, and R2 is the radius of the receiving antenna. The overlapping portion of the plates forms the capacitance C of the high-pass filter, and the receiving loop antenna is connected in series with a matching (RF) resistor R, as shown below. Figure 3 As shown in (b) in the diagram, the transmitting antenna and the receiving antenna transmit signals via capacitive near-field coupling.

[0036] III. Core Structural Features and Their Functions like Figure 4 As shown, the vibration-resistant near-field coupling telemetry antenna device of this embodiment includes a transmitting antenna system component 1 and a receiving antenna system component 2.

[0037] The transmitting antenna system component 1 is a rotating part (with centrifugal force directed outwards during rotation), comprising a metal concave trapezoidal groove structure 11, a transmitting antenna PCB substrate 12, a transmitting antenna 13, and a transmitting antenna potting compound 14. The metal concave trapezoidal groove structure 11 has a concave mounting groove with a trapezoidal cross-section, the groove opening being narrower than the bottom, forming a sloping sidewall. The transmitting antenna PCB substrate 12 is bonded to the concave surface of the metal concave trapezoidal groove structure 11 using an adhesive (such as DG-4 structural adhesive). The transmitting antenna 13 is fixed to the transmitting antenna PCB substrate 12 via copper foil. The transmitting antenna potting compound 14 (using 985FR epoxy) fills the remaining portion of the concave cavity, encapsulating the transmitting antenna PCB substrate 12 and the transmitting antenna 13 as a single unit.

[0038] The design principle of this concave trapezoidal groove structure is as follows: when the rotor rotates at high speed, the centrifugal force acts outward, acting on the potting compound and antenna plate, pressing them against the inclined surface of the trapezoidal groove. Due to the narrow groove opening and wide groove bottom, as the potting compound moves towards the bottom of the groove under the action of centrifugal force, it is blocked by the inclined surface and generates positive pressure, forming a self-locking effect, making the potting compound firmly stuck in the groove and unable to come out. This structural design fundamentally solves the problem of traditional planar adhesives easily falling off under high centrifugal force.

[0039] The receiving antenna system component 2 is a stator component, including a metal concave trapezoidal groove structure 21, a receiving antenna PCB substrate 22, a receiving antenna 23, and a receiving antenna potting compound 24. The metal concave trapezoidal groove structure 21 has a concave mounting groove, which is formed on an outwardly protruding metal structure, and its cross-section is trapezoidal. Figure 4 As can be seen, the width of the trapezoidal groove opening is smaller than the width of the groove bottom, forming a sloping sidewall. In other words, the groove itself gradually widens from the opening to the bottom. The receiving antenna PCB substrate 22 is bonded to the concave surface of the metal concave trapezoidal groove structure 21 using an adhesive (such as DG-4 structural adhesive). The receiving antenna 23 is fixed to the receiving antenna PCB substrate 22 by PCB copper foil. The receiving antenna potting compound 24 (using 985FR epoxy) fills the remaining part of the concave cavity, encapsulating the receiving antenna PCB substrate 22 and the receiving antenna 23 into one unit.

[0040] The concave trapezoidal slot structure and the inward-concave trapezoidal slot structure use the same trapezoidal cross-sectional geometry, both with narrow openings and wide bases; the only difference is the opposite installation direction. The inward-concave trapezoidal slot is carved into the structure for the rotor components; the outward-concave trapezoidal slot is carved into the outward-protruding structure for the stator components. Although the stator components do not experience centrifugal force, they are subject to thermal expansion and contraction caused by engine vibration and temperature changes. The outward-concave trapezoidal slot also utilizes a sloped surface to create a self-locking mechanism. When vibration or thermal expansion and contraction attempt to move the potting compound, the normal force generated by the sloped surface fixes it in place, ensuring the long-term reliability of the antenna.

[0041] IV. Precise Capacitor Design and Frequency Margin Configuration In practical applications, since both the transmitting antenna 13 and the receiving antenna 23 are annular copper plates arranged around an axis, forming capacitively coupled plates, and the annular antenna is an arc, its ideal capacitance value is... Determined by the following formula:

[0042] in, Let L be the dielectric constant of the medium between the plates, and L be the axial length. R1 is the radius of the transmitting antenna 13, and R2 is the radius of the receiving antenna 23.

[0043] The presence of potting compound 14 for the transmitting antenna and potting compound 24 for the receiving antenna complicates the dielectric between the electrodes. Both potting compound 14 and potting compound 24 have their own dielectric constants. Considering the thickness and dielectric constant of the potting compound, the actual capacitance value... Determined by the following formula:

[0044] in, d1 is the dielectric constant of the transmitting antenna potting compound 14, and d1 is the thickness of the transmitting antenna potting compound 14. Where is the dielectric constant of air. d1 is the dielectric constant of the receiving antenna potting compound 24, and d2 is the thickness of the receiving antenna potting compound 24.

[0045] The introduction of this formula is of great significance: the potting compound not only serves a fixing function, but its dielectric properties also directly affect the antenna capacitance value. If this factor is ignored, the actual operating frequency will deviate from the design value, potentially leading to signal attenuation. This invention, through precise calculations, ensures that the antenna can still operate at the expected frequency even with the potting compound present.

[0046] The engine rotor undergoes dynamic balancing, resulting in minimal radial runout during operation. However, due to thermal expansion and contraction or axial forces, some axial runout may occur, which should be considered during the design phase. When the axial runout of the engine is L1, the capacitance value... Further revised to:

[0047] At this point, the cutoff frequency of the high-pass filter composed of the transmitting and receiving antennas... Determined by the following formula:

[0048] Where R is the matching resistor.

[0049] In this embodiment of the invention, the axial length L and coverage angle of the antenna are adjusted according to the expected axial movement of the engine (e.g., ±1 mm). This ensures that within the range of motion, the cutoff frequency... The frequency is always kept below 80% of the telemetry system's operating frequency (e.g., 2.4 GHz), meaning at least a 20% margin is maintained. This frequency margin design ensures that even if the engine experiences axial movement, the signal transmission channel remains within the passband, without signal attenuation or interruption, thus significantly improving the stability of signal transmission.

[0050] V. Grounding Connection Structure and Process The engine components are made of titanium, and signal grounding points are difficult to solder directly to titanium, especially the rotor components. The manufacturing process must avoid causing significant damage to the metal to prevent affecting its strength. For example... Figure 5 and Figure 6 As shown, the embodiments of the present invention employ an innovative grounding connection structure.

[0051] The grounding connection structure includes a high-temperature alloy sheath (made of GH3030) and a copper sheet. First, the GH3030 sheath (0.1mm thick, approximately 1×0.5cm in size) is resistively spot-welded to the engine's titanium alloy grounding point; then, a pure copper sheet (of the same thickness and size) is resistively spot-welded to the GH3030 sheath; finally, the outer shielding ground wire of the antenna lead is soldered to the copper sheet.

[0052] The advantages of this grounding connection structure are as follows: Copper and titanium have significantly different melting points, making direct spot welding unreliable. GH3030 high-temperature alloy, with a melting point between copper and titanium, serves as an intermediate transition layer, enabling it to form a good metallurgical bond with both. Furthermore, spot welding involves localized heating, resulting in a small heat-affected zone and preventing damage to the strength of the titanium alloy substrate. This grounding method maintains low resistance even under high temperature and vibration environments, ensuring the stability of the signal reference ground.

[0053] Antenna interface structure description: like Figure 5 As shown, the transmit antenna interface includes the following structural features: The transmitting antenna feed point 17 is located at one end of the transmitting antenna 13 and is used for soldering the radio frequency signal core. The transmitting antenna signal ground point 18 is located at the other end of the transmitting antenna 13 and is connected to the metal structure through the aforementioned dissimilar metal spot welding process. The first lead groove 19 is used to accommodate and fix the radio frequency lead, preventing the lead from shaking during high-speed rotation.

[0054] like Figure 6 As shown, the receiving antenna interface includes two parts: a matching resistor connection (a) and a signal line interface connection (b).

[0055] Figure 6 (a) is a schematic diagram of the matching resistor connection, including: the resistor grounding point 30 is connected to the metal structure by dissimilar metal spot welding process; two matching resistors 31 are connected in series between the antenna and the grounding point for impedance matching; the resistor body is coated with protective glue to prevent vibration damage.

[0056] Figure 6 (b) is a schematic diagram of the signal line interface connection, including: the receiving antenna feed point 27 is located at one end of the receiving antenna 23 and is used to weld the radio frequency signal core; the receiving antenna signal ground point 28 is connected to the metal structure through dissimilar metal spot welding process; the second lead groove 29 is used to accommodate and fix the radio frequency lead.

[0057] The grounding connection of the receiving antenna 23 adopts the same process as that of the transmitting antenna 13: first, spot weld the GH3030 thin film to the titanium alloy structure, then spot weld the copper film to the GH3030 thin film, and finally solder the outer shielding layer of the RF lead to the copper film.

[0058] It should be noted that, Figure 5 The transmitting antenna signal grounding point 18 in the diagram uses the aforementioned grounding connection structure to connect with the metal structure. Specifically, a reliable transition connection between the titanium alloy and the copper wire is achieved through the GH3030 intermediate layer. Similarly, Figure 6 The resistor grounding point 30 and the receiving antenna signal grounding point 28 in the middle also adopt the same grounding connection structure.

[0059] VI. Integrated Process Implementation Steps This invention provides an integrated implementation method for a vibration-resistant near-field coupling telemetry antenna device, used to manufacture the aforementioned device, specifically including: The integration and fabrication process of transmitting antenna system component 1 is as follows: The transmitting antenna PCB substrate 12, with four transmitting antennas evenly distributed, is connected to the concave surface of the trapezoidal groove of the metal concave trapezoidal groove structure 11 by adhesive (DG-4 structural adhesive) and allowed to dry completely.

[0060] Solder the RF signal core to the transmit antenna feed point.

[0061] At the grounding connection, cut a 0.1mm thick GH3030 thin sheet (approximately 1×0.5cm) and spot weld it to the titanium alloy ground in the groove; cut a pure copper thin sheet of the same size and spot weld it to the GH3030 material; the outer shielding layer of the RF lead is soldered to the copper sheet.

[0062] The RF lead is led out from the first lead groove and fixed with adhesive (DG-4 structural adhesive) to prevent the lead from shaking during high-speed rotation.

[0063] After vacuum mixing of the potting compound (985FR epoxy), the compound is poured into the antenna slot using a mold to fill the groove completely, ensuring no air bubbles.

[0064] After the potting compound has fully cured, the surface of the compound is machined to be flat with the plane of the structure on a machine tool, and then polished smooth to make the surface of the compound flush with the plane of the structure, so as to achieve conformal integration between the antenna and the structure.

[0065] The integration and fabrication process of receiving antenna system component 2 is as follows: At the resistor grounding point, a thin GH3030 sheet is cut and spot-welded to the titanium alloy in the groove; a thin pure copper sheet is cut and spot-welded to the GH3030 material; a copper pin is processed and soldered to the copper sheet. This copper pin is the pre-prepared grounding copper pin, which is used for subsequent connection to the grounding point of the receiving antenna.

[0066] After passing the copper needle through the resistor grounding point of the receiving antenna PCB substrate 22, the receiving antenna PCB substrate 22 is connected to the concave surface of the metal concave trapezoidal groove structure 21 by adhesive (DG-4 structural adhesive) and allowed to dry completely.

[0067] Solder the copper pin to the grounding point of the receiving antenna; solder the RF lead core to the feed point of the receiving antenna; solder the matching resistor (e.g., 100Ω) and protect it with glue.

[0068] Near the feed point of the receiving antenna, GH3030 thin-film and pure copper thin-film are spot-welded together again to connect the outer shielding layer of the RF lead to the copper foil.

[0069] The RF lead is led out from the second lead slot and fixed with adhesive (DG-4 structural adhesive).

[0070] After vacuum mixing of the potting compound (985FR epoxy), the compound is poured into the antenna slot using a mold to fill the groove.

[0071] After the potting compound has fully cured, the surface of the compound is machined to be flat with the plane of the structure on a machine tool, and then polished smooth to make the surface of the compound flush with the plane of the structure, so as to achieve conformal integration between the antenna and the structure.

[0072] In this embodiment of the invention, the potting compound used is 985FR epoxy resin, which has good high temperature resistance and vibration resistance. However, it is understood that the potting compound can also be of other types. Any other type of potting compound that can meet the high temperature working environment of the engine (such as above 100°C), has good bonding strength and vibration resistance, such as other grades of epoxy resin, silicone, etc., can be used as equivalent substitute materials in this embodiment of the invention.

[0073] The aforementioned integration process enables conformal packaging of the antenna device (including transmitting antenna system component 1 and receiving antenna system component 2) with the engine structure, specifically in the following aspects: First, conformal structural design: By bonding the antenna PCB substrate into the trapezoidal groove, the antenna is made to fit snugly against the engine structure surface. Then, through potting compound filling (transmitting antenna system component 1 is filled with transmitting antenna potting compound 14, and receiving antenna system component 2 is filled with receiving antenna potting compound 24) and machining, the cured surface of the compound is made flush with the engine structure plane. Ultimately, the antenna is completely embedded inside the structure, not protruding from the surface, forming an integrated structure with the engine, ensuring that the engine's original aerodynamic shape remains unaffected.

[0074] Secondly, electrical conformality: the potting compound 14 for the transmitting antenna and the potting compound 24 for the receiving antenna not only serve a fixing function, but their dielectric properties are also taken into account in the antenna design, ensuring that the electrical performance of the antenna after potting is consistent with the design target, and avoiding the performance deviation caused by the change of the installation method of traditional external antennas.

[0075] Finally, conformal mechanics: the self-locking effect formed by the trapezoidal slot structure and the potting compound makes the antenna and engine structure a mechanical whole, jointly bearing centrifugal force, vibration and thermal stress, without relative displacement or separation.

[0076] This conformal packaging design enables the antenna device described in this embodiment of the invention to achieve reliable signal transmission in harsh environments without altering the original engine structure or affecting aerodynamic performance.

[0077] VII. Experimental Verification Results Through the above design and process, the antenna device prepared in the embodiment of the present invention successfully achieved signal transmission in the high-pressure compressed air dynamic stress test of the engine, with a test speed of 20,000 rpm and a test temperature resistance of 100℃, meeting the application requirements of high centrifugal force (up to about 30,000 g) and high temperature environment, and there was no colloid shedding, the signal transmission was stable, and the packet loss rate was less than 0.1%.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of 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. A vibration-resistant near-field coupling telemetry antenna device, characterized in that, include: The transmitting antenna system component (1) is a rotating part, including a metal concave trapezoidal groove structure (11), a transmitting antenna PCB substrate (12), a transmitting antenna (13), and a transmitting antenna potting compound (14). The transmitting antenna PCB substrate (12) is fixed to the concave surface of the metal concave trapezoidal groove structure (11) by an adhesive; the transmitting antenna (13) is disposed on the transmitting antenna PCB substrate (12); the transmitting antenna potting compound (14) fills the remaining part of the concave cavity of the metal concave trapezoidal groove structure (11) to encapsulate the transmitting antenna PCB substrate (12) and the transmitting antenna (13) into one unit; The receiving antenna system component (2) is a stator component, including: a metal concave trapezoidal groove structure (21), a receiving antenna PCB substrate (22), a receiving antenna (23), and a receiving antenna potting compound (24). The receiving antenna PCB substrate (22) is fixed to the concave surface of the metal concave trapezoidal groove structure (21) by an adhesive; the receiving antenna (23) is disposed on the receiving antenna PCB substrate (22); the receiving antenna potting compound (24) fills the remaining part of the concave cavity of the metal concave trapezoidal groove structure (21) to encapsulate the receiving antenna PCB substrate (22) and the receiving antenna (23) into one unit; The transmitting antenna (13) and the receiving antenna (23) transmit signals through capacitive near-field coupling, and the transmitting antenna system component (1) and the receiving antenna system component (2) are respectively encapsulated with the engine structure through transmitting antenna potting compound (14) and receiving antenna potting compound (24).

2. The apparatus according to claim 1, characterized in that, Both the transmitting antenna (13) and the receiving antenna (23) are annular copper sheets arranged around an axis, forming capacitively coupled plates, with an ideal capacitance value of Determined by the following formula: in, Let L be the dielectric constant of the medium between the plates, and L be the axial length. R1 is the antenna coverage angle, R2 is the radius of the transmitting antenna (13), and R2 is the radius of the receiving antenna (23).

3. The apparatus according to claim 2, characterized in that, The transmitting antenna potting compound (14) and the receiving antenna potting compound (24) have their own dielectric constants and actual capacitance values. The calculation further considers the thickness and dielectric constant of the transmitting antenna potting compound (14) and the receiving antenna potting compound (24), the actual capacitance value Determined by the following formula: in, d1 is the dielectric constant of the transmitting antenna potting compound (14), and d1 is the thickness of the transmitting antenna potting compound (14). The dielectric constant of air is . d1 is the dielectric constant of the receiving antenna potting compound (24), and d2 is the thickness of the receiving antenna potting compound (24).

4. The apparatus according to claim 3, characterized in that, When there is an axial movement L1 in the engine, the capacitance value Determined by the following formula: The cutoff frequency of the high-pass filter composed of the transmitting antenna (13) and the receiving antenna (23) Determined by the following formula: Where R is the matching resistor, and the axial length and coverage angle of the antenna are configured such that, within the expected axial sway range, the cutoff frequency... It is lower than the operating frequency of the telemetry system, and retains a frequency margin of more than 20%.

5. The apparatus according to any one of claims 1-4, characterized in that, It also includes a grounding connection structure, which comprises: The high-temperature alloy thin sheet is resistively spot-welded to the grounding point of the engine's titanium metal structure. The copper sheet is resistance-spot welded to the high-temperature alloy sheet. The outer shielding ground wire of the antenna lead is soldered to the copper foil.

6. The apparatus according to claim 5, characterized in that, The material of the high-temperature alloy skin is GH3030.

7. An integrated implementation method for a vibration-resistant near-field coupling telemetry antenna device, used to manufacture the device as described in any one of claims 1-6, characterized in that, Includes the following steps: The transmitting antenna PCB substrate (12) and the receiving antenna PCB substrate (22) are respectively bonded to the grooves of the metal concave trapezoidal groove structure (11) and the metal convex trapezoidal groove structure (21) using structural adhesive; Solder the RF leads to the antenna feed point and solder a matching resistor to the receiving antenna; The grounding connection of the antenna system is achieved by combining dissimilar metal spot welding and soldering. The radio frequency leads are bonded and fixed using structural adhesive; After vacuum mixing, the potting compound is poured into the antenna slot; After the potting compound has fully cured, the surface of the compound is machined to make it flush with the structural plane and then polished smooth.

8. The method according to claim 7, characterized in that, The step of grounding the antenna system by combining dissimilar metal spot welding and soldering further includes: At the titanium alloy grounding point of the engine component, first connect the GH3030 high-temperature alloy sheet to the grounding point by resistance spot welding. The copper sheet is then resistance-spot welded to the GH3030 high-temperature alloy sheet. Finally, the outer shield ground wire of the antenna lead is soldered to the copper foil.

9. The method according to claim 7, characterized in that, The potting compound is 985FR epoxy resin.

10. The method according to claim 7, characterized in that, Before the step of bonding the transmitting antenna PCB substrate (12) and the receiving antenna PCB substrate (22) to the grooves of the metal concave trapezoidal groove structure (11) and the metal convex trapezoidal groove structure (21) respectively using structural adhesive, for the receiving antenna system component (2), a grounding copper pin is prepared in advance at the resistance grounding point by a dissimilar metal spot welding process before bonding the receiving antenna PCB substrate (22). The grounding copper pin is used to solder to the receiving antenna grounding point after the receiving antenna PCB substrate is bonded.

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