Integrated stamping LC loading miniaturized patch antenna and preparation method thereof

Abstract

This invention discloses an integrated stamped LC-loaded miniaturized patch antenna and its fabrication method, belonging to the field of miniaturized antenna technology. The antenna includes a radiating patch body integrally stamped from a metal sheet, multiple bent metal branches extending integrally from the periphery of the radiating patch body and bent downwards, a PTFE capacitor loading patch disposed between the bottom end of each bent metal branch and a ground plane, a feed post integrally cut and bent from a metal sheet, and a ground plane. The bent metal branches simultaneously serve as a support structure and an inductive loading element, forming an LC composite loading resonant structure with the PTFE capacitor loading patch, significantly reducing the antenna's electrical length. The main body is integrally formed through a single stamping process. This invention eliminates the need for a dielectric substrate and separate assembly, offering advantages such as miniaturization, lightweight, and low cost. The electrical length can reach 0.127 times the operating wavelength, the efficiency reaches 77.6%, and the weight is less than 5g.

Description

Technical Field

[0001] This invention relates to the field of miniaturized antenna technology, and in particular to an integrated stamped LC-loaded miniaturized patch antenna and its fabrication method. Background Technology

[0002] With the rapid development of the Internet of Things, smart homes, and portable wireless devices, miniaturization, lightweight design, and low cost have become core requirements for antenna design. Currently, the mainstream miniaturized communication antennas in the industry mainly include the following categories: 1. Ceramic Antenna: Utilizing a high-dielectric-constant ceramic dielectric as the substrate, the antenna structure is formed by printing a metal radiating layer on the ceramic surface. Typical processes include ceramic powder molding, high-temperature sintering, metallization printing, and electrode fabrication. The high dielectric constant of the ceramic allows for a reduction in the physical size of the antenna, making it widely used in short-range communication scenarios such as Bluetooth, WiFi, and GPS.

[0003] 2. PCB Microstrip Antenna: Using FR4, PTFE, or other printed circuit boards as the substrate, metal radiating patches are etched onto the substrate surface to form the antenna structure. The back side is a metal ground layer, and it is fed through a microstrip line or coaxial probe. PCB antennas are mature in manufacturing and moderately priced, making them one of the most widely used antenna types in consumer electronics.

[0004] 3. Split-type metal patch antenna: This type of antenna uses an independent metal patch as the radiator, which is fixed above the ground plane by a support structure such as a plastic bracket or dielectric pillar, and is fed through a probe or coupling method. This type of antenna has no dielectric substrate loss and has high radiation efficiency, but its structure is dispersed and assembly is complex.

[0005] The common design approach for existing miniaturized antennas is to reduce the electrical size of the antenna by loading with a high dielectric constant medium, bending the radiating arms, and adding parasitic elements, while relying on an independent dielectric substrate or support structure to fix the antenna structure.

[0006] Existing miniaturized antenna technologies have the following technical problems: 1. Ceramic antennas are heavy, costly, and easily broken: The high density of ceramic dielectric leads to a high overall weight of the antenna, with a single antenna typically weighing over 10g, making it difficult to meet the requirements of ultra-lightweight equipment; ceramic materials are brittle, have poor impact and vibration resistance, and are easily broken; processing requires multiple complex steps such as powder preparation, molding, sintering, and metallization, resulting in a long production cycle, low yield, and high mass production cost.

[0007] 2. Limited miniaturization capability of ceramic antennas: Due to the upper limit of the dielectric constant of ceramics and the processing precision, there is a bottleneck in the ability to reduce the electrical size of antennas, making it difficult to achieve the ultimate miniaturization design below 0.15 times the wavelength, and unable to adapt to the installation space of miniaturized IoT terminals.

[0008] 3. PCB microstrip antennas are limited by the substrate: they rely on the support of the dielectric substrate, and the thickness and dielectric loss of the substrate limit the improvement of antenna radiation efficiency; at the same time, the substrate itself has a certain weight and volume, making it impossible to achieve an ultra-lightweight design; the cost of the substrate increases rapidly with the requirements of high frequency and low loss.

[0009] 4. Split-type metal patch antennas have complex structures and poor consistency: the radiating patch, support structure, and feed structure are independent components that need to be processed and assembled separately, resulting in many assembly steps and high labor costs; assembly errors directly affect the consistency of antenna performance, making it difficult to control batch yield; the split structure requires additional fixing brackets or adhesives, increasing the overall weight and cost.

[0010] 5. Existing miniaturized loading solutions have low integration: Traditional LC-loaded miniaturized antennas are usually implemented by welding lumped inductor and capacitor components or by embedding them in multi-layer boards. Component welding increases process complexity and failure rate, while multi-layer board solutions are costly and have long design cycles, and cannot be integrated with the antenna radiation structure.

[0011] In summary, existing miniaturized antennas generally suffer from technical pain points such as modular structure, multiple processing steps, heavy weight, high cost, and limited miniaturization. The industry urgently needs a patch antenna structure that is integrally molded, ultra-lightweight, ultra-small electrical length, and can be mass-produced at low cost. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated stamped LC-loaded miniaturized patch antenna and its fabrication method. The antenna uses a single piece of copper metal sheet to achieve integrated molding of the radiating patch, supporting stubs, and feed post through a one-time stamping process. At the same time, inductive loading is achieved by bending the metal stubs and capacitive loading is achieved by PTFE patches at the ends of the stubs. Extreme miniaturization is achieved through LC composite loading. The overall structure has no dielectric substrate and no separate assembly, and has the advantages of miniaturization, lightweight, and low cost. The electrical length can reach 0.127 times the operating wavelength, the antenna efficiency can reach 77.6%, and the weight is less than 5g, which is significantly better than traditional ceramic antennas in terms of weight and processing cost.

[0013] The objective of this invention is achieved through the following technical solution: The first aspect of this invention provides: an integrated stamped LC-loaded miniaturized patch antenna, including a radiating patch body, which is integrally stamped and cut from a metal sheet, serving as the core radiating element of the antenna. The radiating patch body, the bent metal branch, and the feed post are all made of the same metal sheet structure. The bent metal branches are provided in multiple ways. They are integrally extended from the metal sheets around the radiating patch body and bent downwards. The bent metal branches also serve as the antenna support structure and inductive loading element, used to suspend and support the radiating patch body above the ground plane and generate an equivalent inductive effect in the antenna operating frequency band. Between the bottom of each bent metal branch and the ground plane, a capacitor loading patch of preset thickness is set to form an equivalent plate capacitor between the bent metal branch and the ground plane, so as to achieve capacitor loading. The feed post is integrally stamped, cut, and bent within the metal sheet area of ​​the radiating patch body, and the bottom of the feed post is connected to the radio frequency feed port. A capacitor loading patch is attached to the upper surface of the grounding plane, and the bottom end of the bent metal branch is pressed onto the capacitor loading patch to form a capacitor loading structure. The equivalent inductance generated by the bent metal stubs and the equivalent planar capacitance formed by the capacitor-loaded patch constitute an LC composite loaded resonant structure to reduce the electrical length of the antenna.

[0014] Preferably, the main body of the radiation patch is square, and the metal sheet is a copper sheet.

[0015] Preferably, the number of bent metal branches is four, which are integrally extended from the four sides or four corners of the radiating patch body and bent vertically downward at 90°.

[0016] Preferably, the length and width of the bent metal branch are set according to the target inductance / capacitance.

[0017] Preferably, the capacitor-loaded patch is a PTFE dielectric patch.

[0018] Preferably, the feed post is a vertical column structure, and the bottom of the feed post is connected to a 50Ω coaxial feed line.

[0019] A second aspect of the present invention provides: a method for fabricating an integrated stamped LC-loaded miniaturized patch antenna, used to fabricate any of the above-mentioned integrated stamped LC-loaded miniaturized patch antennas, comprising the following steps: S1. Material preparation steps: Select metal sheets of a preset thickness as raw materials according to the antenna power capacity and mechanical strength requirements; S2. Stamping and cutting steps: Using a metal stamping die, the outline of the radiating patch, the outline of multiple metal branches extending from the periphery of the radiating patch, and the prototype of the feeding column are simultaneously cut out on the metal sheet and integrally formed on the same metal sheet. S3, Bending and forming step: Using a stamping and bending die, the outlines of each metal branch are simultaneously bent downwards at a predetermined angle to form a support structure and an inductor loading arm; at the same time, the feed post prototype is bent downwards to form a vertical feed post. S4. Capacitor loading patch assembly steps: Install capacitor loading patches at the corresponding positions at the bottom of each metal branch to form a capacitor loading structure. S5. Assembly steps: Install the integrated stamped antenna body above the ground plane, attach the capacitor loading patches at the bottom of each metal branch to the upper surface of the ground plane, connect the feed post to the RF port, and complete the antenna assembly.

[0020] The beneficial effects of this invention are: 1) Integrated Copper Sheet Stamping Structure: Existing miniaturized antennas rely on dielectric substrates or separate support structures, with radiators, supports, and feed components being independent parts. This invention uses a single sheet of copper as the sole substrate, simultaneously completing the cutting of radiating patches, forming of support branches, and cutting and bending of feed posts through a stamping process, achieving an integrated, one-piece antenna structure. This eliminates traditional components such as dielectric substrates, plastic supports, and welded feed pins, fundamentally simplifying the antenna structure and manufacturing process.

[0021] 2) Four-way stub design integrating support and inductive loading: This invention combines the antenna support structure with the inductive loading function into one. The metal stubs extending in all four directions bend downwards to form the mechanical support structure of the antenna, replacing the traditional bracket and dielectric substrate. At the same time, the inductive effect of the bent stubs is used to achieve lumped inductive loading, serving the miniaturization of the antenna. This "one stub, two functions" design significantly improves the structural utilization rate and avoids the increase in volume and cost caused by additional loading components.

[0022] 3) PTFE Ultra-thin Patch Capacitor Loading and LC Composite Miniaturization Mechanism: This invention introduces a 0.2mm ultra-thin PTFE dielectric patch between the metal stub end and ground, utilizing the principle of planar capacitors to achieve precise capacitor loading. Together with the stub inductor, it forms an LC composite loading resonant circuit. LC loading significantly reduces the antenna resonant frequency, compressing the antenna electrical length to 0.127 times the wavelength, far exceeding the miniaturization limit of traditional metal patch antennas. Furthermore, the PTFE dielectric loss is extremely low, ensuring antenna radiation efficiency.

[0023] 4) Integrated Cutting and Bending Design of Feed Post: Traditional antenna feeding often uses welded coaxial probes or independent feed components, which suffers from contact loss and assembly errors. The feed post of this invention is directly cut and bent from the same copper sheet where the radiating patch is located, forming a complete integrated structure with the radiating body. This results in zero electrical loss and zero contact resistance, significantly improving the consistency and reliability of antenna performance. Attached Figure Description

[0024] Figure 1 This is a top view of the antenna structure of the present invention; Figure 2 This is a schematic diagram of the 3D axial structure of the antenna of the present invention; Figure 3 This is a simulation curve of the antenna S-parameters in Example 1; Figure 4 This is a simulation curve of the antenna efficiency in Example 1. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] See Figures 1-4 The core of this invention is formed by stamping and bending a single piece of copper sheet. The overall structure, along the vertical direction, includes: a radiating patch body, four sets of bent supporting metal branches, a PTFE capacitor loading patch, a grounding plane, and an integrated cut and bent feed post. The specific structures of each part are as follows: (1) Radiation patch body: The radiation patch is made of a complete metal copper sheet as the base material and is formed into a preset shape by precision stamping and cutting. It is the core radiation unit of the antenna. The radiation patch, supporting branches and feed post are the same copper sheet integral structure, without splicing or welding, with excellent structural integrity and electrical continuity.

[0027] (2) Four-way bending metal branches (inductive loading + integrated support): Metal branches are integrally formed by extending the copper sheet body at the four sides / corners of the radiating patch. The four metal branches are bent vertically downward at 90° at the same time to form the overall suspended support structure of the antenna, so that the radiating patch and the ground plane below maintain a fixed distance, without the need for additional brackets, dielectric substrates or plastic support components.

[0028] Meanwhile, the downward-bent metal stubs generate a stable equivalent inductance effect within the antenna's operating frequency band, achieving lumped inductance loading on the antenna, effectively reducing the antenna's resonant frequency, shrinking its physical size, and optimizing its miniaturization. The stub length and width can be flexibly designed according to the target inductance.

[0029] (3) PTFE ultra-thin capacitor loading structure: A 0.2mm thick PTFE (polytetrafluoroethylene) dielectric patch is set between the bottom end of each metal branch and the ground plane of the equipment. The PTFE patch is clamped between the end of the metal branch and the ground plane. By utilizing the dielectric properties of the ultra-thin low-loss PTFE dielectric, a stable equivalent plate capacitor is formed between the branch and the ground to realize capacitor loading.

[0030] By using an LC composite loading resonant structure of metal stub inductor and PTFE patch capacitor, the antenna size reduction effect is greatly improved, breaking through the size limitations of traditional metal antennas and compressing the antenna electrical length to 0.127 times the operating wavelength.

[0031] (4) Integrated stamped feed post: The feed structure does not require additional soldered probes or separate feed components. The vertical feed post is directly formed by stamping, cutting, and bending in one piece in the metal copper sheet area. The feed post and the radiating patch body are integral structures of the same copper sheet, with lossless electrical connection and excellent contact consistency, completely solving the problems of poor contact and assembly deviation in traditional separate feed structures. The bottom of the feed post is directly connected to the RF feed port.

[0032] (5) Grounding plane: It is the main board of the equipment or an independent metal grounding plate. The PTFE patch is attached to the upper surface of the grounding plane, and the bottom end of the metal branch is pressed onto the PTFE patch to form a stable capacitive loading structure.

[0033] The antenna fabrication method is based on metal stamping to achieve integrated molding. The specific steps are as follows: S1. Material preparation: Select copper sheets of a preset thickness as raw materials. The thickness of the copper sheets is selected according to the antenna power capacity and mechanical strength requirements, typically 0.2mm~1mm. S2. Stamping and cutting: Using precision metal stamping dies, the outline of the radiating patch, the outline of the metal branches extending around it, and the prototype of the power supply column are simultaneously cut out on the whole copper sheet. All structures are integrally formed on the same copper sheet without separate splicing. S3, Bending and Forming: Using a stamping and bending die, four sets of metal branches are simultaneously bent downwards at 90° to form a support structure and an inductor loading arm; at the same time, the feed post prototype is bent downwards to form a vertical feed post. S4, PTFE patch assembly: At the corresponding positions at the bottom of each metal branch, attach a 0.2mm thick PTFE dielectric patch to complete the capacitor loading structure assembly; S5. Assembly: The integrated stamped antenna body is installed above the ground plane, and the PTFE patches at the bottom of each metal branch are attached to the ground plane. The feed post is connected to the RF port to complete the overall antenna assembly.

[0034] The core feature of this method is that the radiating patch, support structure, and power supply structure are all stamped from the same copper sheet in one go, with only the PTFE patch being an independent assembly component. The overall processing steps are extremely simple and the mass production efficiency is extremely high.

[0035] The following is an example, Example 1: Beidou B3 band patch antenna.

[0036] See Figure 1 and Figure 2This embodiment includes a square radiating patch body, four loading support branches, a partial polytetrafluoroethylene dielectric sheet, a grounding plane, and a power supply section. The radiating patch body, the four loading support branches, and the power supply section are continuously formed from the same copper sheet through stamping, cutting, and bending.

[0037] Four load support stubs are spaced circumferentially along the radiating patch body. Each load support stub includes a connection end continuously connected to the radiating patch body, a bent section bending towards the ground plane, and a load end facing the ground plane. The four load support stubs together maintain the spacing between the radiating patch body and the ground plane. Local polytetrafluoroethylene dielectric sheets are respectively placed between the load end and the ground plane, thereby forming four local capacitive coupling regions.

[0038] The feed section is formed by a cutout inside the radiating patch body and bends towards the ground plane, with its lower end used to connect to the 50Ω RF feed port. The specific location and size of the feed section are determined based on the impedance matching results.

[0039] In this embodiment, the copper sheet is 0.5 mm thick, the main body of the radiating patch is a square with a side length of 30 mm, the loading support branches are in four groups, each group is 2.5 mm wide, 8 mm long, and 3.5 mm high; the polytetrafluoroethylene dielectric sheet is 0.2 mm thick, 3 mm × 4 mm in size, and has a dielectric constant of 2.2; the height of the feed section is 10 mm; and the target operating frequency is 1268 MHz.

[0040] With a radiating patch body side length of 30 mm as the characteristic dimension and a free space wavelength of approximately 236.6 mm corresponding to 1268 MHz as the reference, the antenna electrical length is approximately 0.127λ.

[0041] Figure 3 and Figure 4 The measured results of the prototype in this embodiment are shown. Tests were conducted under the target installation condition of the prototype. The results show that: the antenna forms a significant resonance near 1268 MHz; the lowest measured S11 value is approximately -24 dB; the return loss at 1268 MHz is better than -20 dB; the measured peak total efficiency is approximately 77.6%; the measured circular polarization axial ratio is no greater than 3 dB; and the overall weight of the prototype is approximately 4.8 g. These measured results demonstrate that the composite loading structure formed by the loaded support stub and the local capacitive coupling region can achieve a 1268 MHz operating frequency within a 30 mm feature size, while also achieving miniaturization, efficiency, and lightweight design.

[0042] To ensure the comparability of test results, the dimensions of the grounding plane, the routing of the power supply cable, and the installation status of the prototype should be kept consistent during testing. The dimensions of the grounding plane, the conductivity of the copper sheet, the thickness and dielectric constant of the dielectric sheet, the overlap area of ​​the loading end, the bending height, and the error of the power supply connection can all cause changes in the resonant frequency and efficiency. Therefore, appropriate process tolerances should be set for the above parameters during mass production.

[0043] The antenna fabrication method in this embodiment is as follows: S1 provides 0.5 mm thick copper sheets and a stamping die designed according to the unfolded structure.

[0044] S2, the copper sheet is stamped and cut to form the main blank of the radiation patch, the four loading support branches and the power supply blank on the same sheet.

[0045] S3, bend the four loading support branch blanks to the same side to form a bent section and a loading end; simultaneously, bend the feed section blank to the same side. During the bending process, control the bending height of each loading support branch to reduce the height deviation of the radiating patch body relative to the ground plane.

[0046] S4, a polytetrafluoroethylene dielectric sheet is provided between the corresponding areas of each loading end and the ground plane, so that the loading end, the dielectric sheet and the ground plane constitute a local capacitive coupling area.

[0047] S5, assemble the formed antenna body with the ground plane, and electrically connect the feed section to the RF feed port.

[0048] Tuning methods: Without altering the basic structural relationships, the effective overlap area between the loading end and the ground plane can be changed by altering the spread length, width, and bending height of the loading support branches, or by changing the thickness and dielectric constant of the local dielectric layer. This allows for adjustment of the equivalent inductance and equivalent capacitance of the loading branch, thereby regulating the resonant frequency and impedance characteristics. The radiating patch body can also be rectangular or other shapes suitable for forming the target radiation mode, depending on the target frequency band.

[0049] Specifically, increasing the current path length of the load support branch or decreasing its cross-sectional dimensions can change the equivalent inductance of the load branch; increasing the effective overlap area between the load end and the ground plane, decreasing the thickness of the local dielectric layer, or increasing its dielectric constant can increase the equivalent capacitance of the capacitive coupling region. By jointly optimizing the above parameters, the resonant point can be adjusted while keeping the overall shape of the radiating patch basically unchanged.

[0050] Other implementation methods: The number of load support branches is not limited to four; it can be set to three, four, or more depending on the shape of the radiating patch body, mechanical stability, and target electromagnetic characteristics. Multiple load support branches can be arranged symmetrically or non-symmetrically depending on the feed location and target mode. The load end can be rectangular, trapezoidal, or other shapes that can form a stable and effective overlap area with the grounding plane.

[0051] The local dielectric layer is not limited to polytetrafluoroethylene (PTFE); other insulating materials with suitable dielectric constant, dielectric loss, temperature resistance, and mechanical strength can also be used. The local dielectric layer can be pre-attached to the ground plane or pre-installed at the loading end, and then assembled with the antenna body to the ground plane. As long as the loading end maintains electrical insulation with the ground plane and forms the required capacitive coupling relationship, the corresponding loading function can be achieved.

[0052] Metal sheets are not limited to pure copper; copper alloys, plated steel sheets, or other conductive metal sheets can be selected based on conductivity, elasticity, stampability, corrosion resistance, and cost. For products that are prone to oxidation or used in harsh environments, protective coatings can be applied to areas that do not affect electrical contact and capacitive coupling.

[0053] The feed section can be configured as one or more, and its number, location, and orientation are determined according to the target polarization and the feed network. When multiple feed sections are used, each feed section can be connected to the corresponding RF port, and the required amplitude and phase relationship can be provided by the external feed network. When a single feed method is used, the target radiation mode can be formed by combining the shape perturbation or slotted structure of the radiating patch body.

[0054] The advantages of this invention include: 1. Extreme miniaturization: Through the LC composite loading of metal stub inductor and PTFE capacitor, the antenna electrical length can be reduced to 0.106 times the working wavelength, which is far superior to the miniaturization level of traditional ceramic antennas and PCB antennas in the same frequency band, and perfectly adapted to miniaturized IoT terminals, wearable devices and other scenarios with strict installation space requirements.

[0055] 2. Ultra-lightweight: All-metal unibody structure, no heavy ceramic substrate, no PCB board, no plastic bracket, the overall weight is less than 5g (BeiDou B3 band), which is more than 50% lighter than traditional ceramic antennas in the same frequency band, significantly reducing the overall weight of the device, and is especially suitable for lightweight scenarios such as drones, portable devices, wearable products, etc.

[0056] 3. Extremely low mass production cost: It eliminates complex processes such as ceramic sintering, PCB board making, and multi-process assembly. The main body processing can be completed in a single metal stamping. Combined with a simple PTFE mounting process, the processing steps are reduced by more than 70%, and the material and labor costs are greatly reduced. It is suitable for large-scale mass production, and the cost of a single antenna can be controlled to less than 1 / 3 of that of traditional ceramic antennas.

[0057] 4. High performance consistency and reliability: Integrated stamping eliminates assembly errors and welding defects, significantly improving the performance consistency of antenna batches; the all-metal structure eliminates ceramic brittleness and aging issues, resulting in stronger vibration, bending, and impact resistance, and significantly better environmental adaptability and service life than ceramic and PCB antennas.

[0058] 5. Flexible and convenient debugging: By replacing PTFE patches of different thicknesses or dielectric constants, the capacitance loading can be flexibly adjusted to achieve continuous tuning of the antenna resonant frequency without the need to re-open molds or change the stamping structure, which greatly shortens the product debugging cycle and adapts to the product needs of multiple frequency bands and multiple regions.

[0059] 6. High structural integration: The radiation, support, power supply and loading functions are highly integrated, the overall structure is simple, the installation space is small, and it is easy to directly embed into various equipment housings or motherboards, reducing the difficulty of system integration.

[0060] Through simulation and field testing, Embodiment 1 of the present invention achieves an electrical length of 0.127λ and a weight of approximately 4.8g in the 1268MHz frequency band. The return loss is better than -20dB, and the efficiency is approximately 77.6%. All indicators meet the design goals, and it has significant advantages over traditional ceramic antennas in terms of miniaturization, lightweighting, and cost.

[0061] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An integrated stamped LC-loaded miniaturized patch antenna, characterized in that: The antenna includes a radiating patch body, which is integrally stamped and cut from a metal sheet. As the core radiating element of the antenna, the radiating patch body, the bent metal branches, and the feed post are all made of the same metal sheet structure. The bent metal branches are provided in multiple ways. They are integrally extended from the metal sheets around the radiating patch body and bent downwards. The bent metal branches also serve as the antenna support structure and inductive loading element, used to suspend and support the radiating patch body above the ground plane and generate an equivalent inductive effect in the antenna operating frequency band. Between the bottom of each bent metal branch and the ground plane, a capacitor loading patch of preset thickness is set to form an equivalent plate capacitor between the bent metal branch and the ground plane, so as to achieve capacitor loading. The feed post is integrally stamped, cut, and bent within the metal sheet area of ​​the radiating patch body, and the bottom of the feed post is connected to the radio frequency feed port. A capacitor loading patch is attached to the upper surface of the grounding plane, and the bottom end of the bent metal branch is pressed onto the capacitor loading patch to form a capacitor loading structure. The equivalent inductance generated by the bent metal stubs and the equivalent planar capacitance formed by the capacitor-loaded patch constitute an LC composite loaded resonant structure to reduce the electrical length of the antenna.

2. The integrated stamped LC-loaded miniaturized patch antenna according to claim 1, characterized in that: The main body of the radiation patch is square, and the metal sheet is a copper sheet.

3. The integrated stamped LC-loaded miniaturized patch antenna according to claim 1, characterized in that: The number of bent metal branches is four, which are integrally extended from the four sides or four corners of the radiating patch body and bent vertically downward at 90° to form the branch.

4. The integrated stamped LC-loaded miniaturized patch antenna according to claim 1, characterized in that: The length and width of the bent metal branch are set according to the target inductance / capacitance.

5. The integrated stamped LC-loaded miniaturized patch antenna according to claim 1, characterized in that: The capacitor-loaded patch is a PTFE dielectric patch.

6. The integrated stamped LC-loaded miniaturized patch antenna according to claim 1, characterized in that: The feed post is a vertical column structure, and the bottom of the feed post is connected to a 50Ω coaxial feed line.

7. A method for fabricating an integrated stamped LC-loaded miniaturized patch antenna, characterized in that: The method for fabricating an integrated stamped LC-loaded miniaturized patch antenna as described in any one of claims 1-6 includes the following steps: S1. Material preparation steps: Select metal sheets of a preset thickness as raw materials according to the antenna power capacity and mechanical strength requirements; S2. Stamping and cutting steps: Using a metal stamping die, the outline of the radiating patch, the outline of multiple metal branches extending from the periphery of the radiating patch, and the prototype of the feeding column are simultaneously cut out on the metal sheet and integrally formed on the same metal sheet. S3, Bending and forming step: Using a stamping and bending die, the outlines of each metal branch are simultaneously bent downwards at a predetermined angle to form a support structure and an inductor loading arm; at the same time, the feed post prototype is bent downwards to form a vertical feed post. S4. Capacitor loading patch assembly steps: Install capacitor loading patches at the corresponding positions at the bottom of each metal branch to form a capacitor loading structure. S5. Assembly steps: Install the integrated stamped antenna body above the ground plane, attach the capacitor loading patches at the bottom of each metal branch to the upper surface of the ground plane, connect the feed post to the RF port, and complete the antenna assembly.

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