A dielectric rod antenna based on hybrid radiation mode and its design method

Abstract

The present invention discloses a dielectric rod antenna based on a hybrid radiation mode and a design method thereof, comprising: a ceramic dielectric rod and a dielectric-filled rectangular open waveguide, wherein the dielectric-filled rectangular open waveguide comprises a rectangular metal open waveguide, the open waveguide is filled with a dielectric, and a matching section of the ceramic dielectric rod is embedded in the filling dielectric; an inner conductor portion of a coaxial probe is inserted into the filling dielectric, and the coaxial probe is perpendicular to the transmission surface of the rectangular metal open waveguide; in the antenna structure, the dielectric-filled rectangular open waveguide not only serves as a waveguide feeding structure, but also participates in radiation as an open waveguide antenna, and both the open waveguide antenna and the dielectric rod antenna are end-fire radiation modes; and in the low-frequency band, the antenna structure uses open waveguide radiation as the main radiation mode, and the ceramic dielectric rod is used to improve radiation directivity.

Description

Technical Field

[0001] The present invention relates to a design method for an aircraft ultra-wide bandwidth beam antenna, and in particular to a dielectric rod antenna based on a hybrid radiation mode and a design method thereof. Background Art

[0002] When an aircraft reaches Mach 5, its surface temperature can exceed 1000°C, exposing its internal antennas to the harsh high-temperature environment. This places even higher demands on the antenna's high-temperature resistance and thermal insulation. Furthermore, as the entry and exit window for radio waves, antennas play a crucial role in the performance of wireless communication systems. Traditional aircraft antennas have single functions and are distributed in a dispersed manner. With the increasing demand for aircraft communications, aircraft antennas with more functions are needed to support the corresponding communication systems. Using the traditional single-antenna distribution method would require a significant increase in the number of onboard antennas and the design of multiple antenna windows within the aircraft's structural cabin, posing challenges and risks to the aircraft's structural strength. Furthermore, as aircraft cabin dimensions continue to shrink, the space available for antenna openings is very limited. Therefore, it is crucial to design broadband, high-temperature-resistant antennas that integrate all functions.

[0003] Patent 202310176484.4 provides a structurally embedded X- and Ka-band wide-beam thermal antenna feed system, disclosing an antenna structure connecting a tapered, gradient-shaped alumina ceramic dielectric rod and a dielectric-filled rectangular waveguide transmission line. This dielectric rod antenna operates in the Ka-band, where the wavelength λ0 corresponding to the center frequency is relatively small. The dielectric rod's radiating section measures approximately 3.6λ0, and electromagnetic waves enter the dielectric rod and propagate in a traveling-wave radiation mode. Therefore, waveguide-fed dielectric rod antennas are easily designed for broadband and miniaturization in high-frequency bands. However, conventional approaches to dielectric rod antenna design make broadband and miniaturization difficult to achieve in low-frequency bands. This is because the radiation modes of metal waveguide and dielectric waveguide antennas are TE, TM, and mixed TE and TM modes. Their lower cutoff frequencies are inversely proportional to their size, making them difficult to meet small size requirements in low-frequency bands. Furthermore, the dielectric rod is essentially a dielectric waveguide with mixed TE and TM modes, so the cutoff frequency and main mode bandwidth also need to be considered. This limits its application in aircraft, so it is necessary to reconsider the radiation mechanism of the waveguide-fed dielectric rod antenna and design a dielectric rod antenna that can maintain miniaturization even in the low frequency band. Summary of the Invention

[0004] Purpose of the invention: To address the above problems, the present invention proposes a dielectric rod antenna based on a hybrid radiation mode and a design method thereof. By redesigning the radiation mechanism of the waveguide-fed dielectric rod, the size of the antenna in the low-frequency band can be reduced while ensuring the broadband and wide-beam performance of the antenna.

[0005] Technical solution: The technical solution adopted by the present invention is a dielectric rod antenna based on a hybrid radiation mode, including: a ceramic dielectric rod and a dielectric-filled rectangular open waveguide, the dielectric-filled rectangular open waveguide includes a rectangular metal open waveguide, the open waveguide is filled with a dielectric, and the matching section of the ceramic dielectric rod is embedded in the filling dielectric; the inner conductor part of the coaxial probe is inserted into the filling dielectric, and the coaxial probe is perpendicular to the transmission surface of the rectangular metal open waveguide; in this antenna structure, the dielectric-filled rectangular open waveguide not only serves as a waveguide feeding structure, but also participates in radiation as an open waveguide antenna, and the open waveguide antenna and the dielectric rod antenna are both end-fire radiation modes; and in the low-frequency band, the antenna structure uses open waveguide radiation as the main radiation mode, and the ceramic dielectric rod is used to improve the radiation directivity, and the range of the low-frequency band is f0-0.8GHz~f0.

[0006] The matching section and the radiation section of the ceramic dielectric rod are tapered, and the dielectric constant of the ceramic material used is a high dielectric constant greater than 20.

[0007] The coaxial probe is fixed on a dielectric-filled rectangular open waveguide through a metal flange. The probe length of the coaxial probe is adjustable to achieve antenna matching.

[0008] The antenna structure also includes an anti-heat-insulation antenna cover, and the dielectric rod is embedded in the center position of the anti-heat-insulation antenna cover.

[0009] The heat-insulating antenna cover comprises a heat-proof cover plate, which is connected to a square metal flange plate below to form a cover body. The cover body is filled with a heat-insulating layer, and a slot for installing an antenna is provided in the heat-insulating layer.

[0010] The present invention proposes a design method for a dielectric rod antenna based on a hybrid radiation mode, comprising:

[0011] A dielectric rod antenna model is constructed; the dielectric rod antenna model includes: a ceramic dielectric rod and a dielectric-filled rectangular open waveguide, wherein the dielectric-filled rectangular open waveguide includes a rectangular metal open waveguide, the open waveguide is filled with dielectric, and the matching section of the ceramic dielectric rod is embedded in the filling dielectric; the inner conductor portion of the coaxial probe is inserted into the filling dielectric, and the coaxial probe is perpendicular to the transmission surface of the rectangular metal open waveguide; in this antenna structure, the dielectric-filled rectangular open waveguide not only serves as a waveguide feeding structure, but also participates in radiation as an open waveguide antenna, and both the open waveguide antenna and the dielectric rod antenna are end-fire radiation modes;

[0012] Setting a hybrid radiation mode condition of the dielectric rod antenna model so that in a low-frequency band, the antenna structure uses open waveguide radiation as the main radiation mode, and the ceramic dielectric rod is used to improve radiation directivity, wherein the low-frequency band ranges from f0-0.8 GHz to f0;

[0013] Based on the transient electromagnetic field simulation of the finite integral algorithm, the optimal solution for the antenna size is calculated based on the dielectric rod antenna model and the mixed radiation mode conditions. The distance from the coaxial probe feed point to the bottom of the rectangular metal open waveguide, and the lengths of the wide and narrow sides of the rectangular metal open waveguide are optimized within a certain range based on various reference values.

[0014] The step of setting the mixed radiation mode condition of the dielectric rod antenna model includes:

[0015] The distance from the coaxial probe feed point to the bottom of the rectangular metal open waveguide is designed. The reference value is calculated according to the following formula:

[0016]

[0017] Among them, L ref is the reference value of the distance from the coaxial probe to the bottom of the rectangular metal open waveguide, c is the speed of light in vacuum, f is the center frequency of the antenna, ε r is the dielectric constant of the medium filling the waveguide;

[0018] When designing a rectangular metal open waveguide to operate in the target frequency band, the reference calculation formula for the wide side and narrow side lengths is:

[0019]

[0020] Where W1 and W2 are the wide side and narrow side of the rectangular waveguide, m and n are the mode numbers, and λ is the wavelength corresponding to the operating frequency.

[0021] The present invention proposes a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the design method of the dielectric rod antenna based on the hybrid radiation mode is implemented.

[0022] The present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for designing a dielectric rod antenna based on a hybrid radiation mode is implemented.

[0023] The present invention provides a computer program product, comprising a computer program and / or instructions, which implement the design method of the dielectric rod antenna based on the hybrid radiation mode when the computer program / instructions are executed by a processor.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0025] (1) For waveguide-fed dielectric rod antennas, traditional theory believes that discontinuities at the open waveguide aperture will lead to electromagnetic wave leakage, reducing the radiation efficiency of the dielectric rod antenna. In the antenna designed by the present invention, by reinterpreting the radiation mechanism of the waveguide-fed dielectric rod, the designed antenna utilizes two hybrid modes: the open waveguide radiation mode (low frequency) and the dielectric rod traveling wave radiation mode (high frequency). It can still maintain a low profile and have broadband and wide beam radiation characteristics when the operating frequency band is low. In the low frequency band (about f0-0.8GHz~f0), the open waveguide antenna is constructed using a coaxial-waveguide feeding structure, and the electromagnetic waves radiated by the open waveguide are considered to be effective radiation. By loading a high dielectric constant dielectric rod, its lower cutoff frequency is reduced, and the directivity is improved, thereby reducing the influence of the surrounding environment on its radiation performance. As the frequency increases to the high frequency band (about f0~f0+0.6GHz), the antenna radiation mode gradually transforms into a traveling wave radiation mode along the dielectric rod, and the phase center gradually rises to the top of the dielectric rod. The hybrid mode can be used to broaden the bandwidth, achieve a wide beam, and at the same time, the antenna has good directivity and is not easily affected by the surrounding environment. (2) Since the electromagnetic waves transmitted in the metal waveguide and the dielectric waveguide are TE mode, TM mode, and a hybrid mode of TE and TM, the dielectric rod antenna fed by the waveguide is very large in the low frequency band. The present invention can help reduce the size of the antenna by filling the feeding waveguide with a medium with a higher dielectric constant and using a high dielectric constant ceramic medium for the dielectric rod. (3) On this basis, the integrated design of the heat shield and the miniaturized hybrid radiation mode antenna achieves high temperature resistance and heat insulation performance while achieving wide beam radiation performance in a narrow window within a frequency band with an absolute bandwidth greater than 1.3GHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the overall structure of the dielectric rod antenna based on the hybrid radiation mode according to the present invention;

[0027] Figure 2 The cross-sectional views of the antenna of the present invention are as follows: (a) is a front view; (b) is a side view;

[0028] Figure 3 is a front view of a single dielectric rod;

[0029] Figure 4 The simulation and measured S of the dielectric rod antenna based on the hybrid radiation mode of the present invention 11 Comparison chart;

[0030] Figure 5 The electric field diagram of the dielectric rod antenna without a heat-insulating antenna cover at every 0.2 GHz;

[0031] Figure 6The radiation pattern of the dielectric rod antenna without a heat-insulating radome at every 0.2 GHz.

[0032] Figure 7 The antenna of the present invention can achieve a gain cross-sectional diagram;

[0033] Figure 8 The temperature rise curve of a typical part of the prototype of the present invention is heated over time. In a high temperature environment of 1200°C, the temperature of the feed port is kept below 150°C within 1600s.

[0034] Figure 9 Flowchart of the design method of dielectric rod antenna based on hybrid radiation mode. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] like Figure 1 As shown, a miniaturized ultra-wide bandwidth beam high temperature resistant antenna based on a hybrid radiation mode mainly includes a dielectric rod and a rectangular open waveguide, and the entire antenna is installed in the center of the antenna cover.

[0038] The antenna comprises a high-dielectric-constant ceramic rod 101, a rectangular metal open waveguide 201, a dielectric filler 202 within the open waveguide, a coaxial probe 203, a small metal flange 204, and screws 205. The dielectric filler 202 is located within the rectangular metal open waveguide 201; the high-dielectric-constant ceramic rod 101 is inserted into the dielectric filler 202 within the open waveguide to facilitate securement. The small metal flange 204 is secured to the rectangular metal open waveguide 201 via four screws 205. The high-dielectric-constant ceramic rod 101 has a dielectric constant greater than 20. Antenna matching can be achieved by adjusting the length of the inner probe in the coaxial feed, increasing system flexibility.

[0039] The heat-insulating antenna cover comprises a heat-insulating cover plate 301 , a heat-insulating layer 302 , and a square metal flange 303 . The heat-insulating cover plate 301 and the square metal flange 303 are fixed by four screws 304 .

[0040] In this embodiment, the antenna's thermal insulation layer 302 is made of a low-dielectric-constant ceramic material, with a dielectric constant close to that of air; the heat-resistant cover 301 is made of quartz material; the ceramic dielectric rod 101 is made of a high-dielectric-constant ceramic material; and the filling medium 202 in the open waveguide is made of polytetrafluoroethylene material.

[0041] Example 2

[0042] The design method of the dielectric rod antenna based on the hybrid radiation mode of the present invention is as follows: Figure 9As shown, including:

[0043] Step 1: Construct a dielectric rod antenna model. The model consists of a rectangular metal open waveguide filled with dielectric, a feed coaxial cable, and a high-permittivity ceramic dielectric rod. The matching section of the ceramic dielectric rod is embedded in the dielectric. The inner conductor of the coaxial probe is inserted into the dielectric and perpendicular to the transmission surface of the rectangular metal open waveguide. The matching performance of the entire antenna can be improved by adjusting the length and position of the coaxial probe.

[0044] Step 2: Setting the mixed radiation mode conditions of the dielectric rod antenna model, including:

[0045] Figure 2 (a) and (b) are the front and side views of the antenna prototype system, respectively. To achieve better impedance matching, the distance from the coaxial probe at the feed point to the bottom of the rectangular metal open waveguide needs to be designed. The reference value is calculated according to the following formula:

[0046]

[0047] Among them, L ref is the reference value of the distance from the coaxial probe to the bottom of the rectangular metal open waveguide, c is the speed of light in vacuum, f is the center frequency of the antenna, ε r is the dielectric constant of the medium filling the waveguide.

[0048] In actual design, optimization is performed based on the reference value. Optimization is performed within the following range:

[0049] L ref -δ≤L≤L ref +δ

[0050] Wherein, L is the distance from the coaxial probe to the bottom of the rectangular metal open waveguide, δ is the optimization range, and in this embodiment, the optimization range is 0.5 mm.

[0051] Design rectangular metal open waveguide to work in the target frequency band, mn For the model, its size is calculated according to the following formula:

[0052]

[0053] Where W1 and W2 are the wide and narrow sides of the rectangular waveguide, respectively, m and n are the mode numbers, and λ is the wavelength corresponding to the operating frequency. Similarly, the lengths of the wide and narrow sides of the rectangular waveguide are also optimized within a certain range based on the reference values ​​calculated above.

[0054] The dielectric rod is designed to be divided into three sections: a matching section, a transition section, and a radiating section. While ensuring proper radiation from the open waveguide antenna, the length of the matching section is minimized and the coaxial probe is placed as close to the matching section as possible to reduce reflected waves back to the feed point. This allows both the quarter-wavelength monopole antenna and the open waveguide antenna, corresponding to the coaxial line's inner conductor, to effectively radiate.

[0055] When designing the dielectric rod radiator section, its cross-sectional height was severely limited. This was partly due to the confined installation environment on the aircraft, and partly because the distance from the top of the dielectric rod to the heat shield would affect the antenna's high-temperature performance. Therefore, the cross-sectional height of the dielectric rod radiator section needed to be minimized. At low frequencies, the physical length of the radiator section is only 1.2λ. max (λ max =( ...

[0056] The transition section of the dielectric rod can be viewed as a dielectric waveguide transmission line. Its length does not affect the matching and radiation performance of the antenna. Therefore, varying the length of the transition section can adjust the distance between the top of the dielectric rod and the heat shield, thereby achieving a balance between beamwidth and thermal insulation performance.

[0057] In step 3, a transient simulation using the finite integration algorithm is performed using the commercial software CST Studio Suite. Based on the dielectric rod antenna model in step 1 and the mixed radiation pattern conditions in step 2, the optimal solution for antenna size is calculated.

[0058] The present invention uses an existing transient simulation solver based on a finite integral algorithm to perform simulation calculations without improving the algorithm itself. In this embodiment, the commercial software CST Studio Suite can be directly used to complete the above modeling and simulation.

[0059] Figure 4 The following figure compares the simulated and measured S11 values ​​of the complete antenna; the two agree well. Ultra-wideband performance with an absolute bandwidth greater than 1.3 GHz is achieved within the C-band.

[0060] Figure 5The electric field plot for a dielectric rod antenna without a thermal shield is shown at intervals of 0.2 GHz from f0-0.8 to f0. As can be seen from the figure, at low frequencies, electromagnetic waves are primarily radiated through the open waveguide antenna. The high-permittivity dielectric rod acts as a dielectric loading agent for the open waveguide antenna, enhancing the antenna's directivity. As the frequency increases, the antenna gradually transitions to the traveling-wave radiation mode of the dielectric rod antenna, radiating out from the tip of the dielectric rod.

[0061] Figure 6 The radiation pattern of a dielectric rod antenna without a thermal shield is shown at intervals of 0.2 GHz from f0-0.8 to f0. As can be seen from the figure, at low frequencies, even though the primary radiation mode is an open-waveguide mode, the high-permittivity dielectric rod acts as a dielectric loading mechanism for the open-waveguide. Therefore, the antenna's phase center is not at the waveguide aperture, but slightly above the rod center. As the frequency increases, the open-waveguide radiation mode gradually transitions to the dielectric rod's traveling-wave radiation mode. The dielectric rod antenna inherently exhibits traveling-wave end-fire characteristics, making it less susceptible to environmental influences.

[0062] Figure 7 The antenna of the present invention can realize a gain cross-sectional diagram, wherein the gain is greater than -5dBi within the range of ±60° of the beam, thus achieving wide beam radiation performance.

[0063] Figure 8 The temperature rise curve of the typical parts of the prototype of the present invention is shown in the figure below. In order to verify the heat resistance of the antenna prototype, a thermal simulation test was performed using the commercial software CST Studio Suite. The temperature was set to 1200℃ and the heating was continued for 1600s. The temperature rise curve of the typical parts is shown in the figure below. Figure 8 As shown, it can be seen that the prototype can work normally at high temperature, slowing down the transfer of heat so that the temperature of the feed end does not exceed 150℃.

[0064] Figure 9 A design flow chart of dielectric rod antenna based on hybrid radiation mode is given.

[0065] In summary, the integrated design of the heat shield and the hybrid radiation mode antenna of the present invention achieves an absolute operating bandwidth greater than 1.3 GHz and keeps the port temperature of the high-temperature resistant antenna below 150°C within 1600s in an environment of 1200°C.

[0066] In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned design method of a dielectric rod antenna based on a hybrid radiation mode when executing the computer program.

[0067] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for designing a dielectric rod antenna based on a hybrid radiation mode is implemented.

[0068] In one embodiment, a computer program product is provided, comprising a computer program / instruction, which implements the design method of the dielectric rod antenna based on the hybrid radiation mode when executed by a processor.

[0069] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0070] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

Claims

1. A dielectric rod antenna based on a hybrid radiation mode, characterized in that: include: A ceramic dielectric rod and a dielectric-filled rectangular open waveguide, wherein the dielectric-filled rectangular open waveguide comprises a rectangular metal open waveguide, the open waveguide is filled with dielectric, and the matching section of the ceramic dielectric rod is embedded in the filling dielectric; the inner conductor portion of the coaxial probe is inserted into the filling dielectric, and the coaxial probe is perpendicular to the transmission surface of the rectangular metal open waveguide; in this antenna structure, the dielectric-filled rectangular open waveguide not only serves as a waveguide feeding structure, but also participates in radiation as an open waveguide antenna, and both the open waveguide antenna and the dielectric rod antenna are end-fire radiation modes; and in the low-frequency band, the antenna structure uses open waveguide radiation as the main radiation mode, and the ceramic dielectric rod is used to improve radiation directivity, and the low-frequency band ranges from f0-0.8GHz to f0; The distance from the coaxial probe feed point to the bottom of the rectangular metal open waveguide is designed. The reference value is calculated according to the following formula: Among them, L ref is the reference value of the distance from the coaxial probe to the bottom of the rectangular metal open waveguide, c is the speed of light in vacuum, f is the center frequency of the antenna, ε r is the dielectric constant of the medium filling the waveguide; When designing a rectangular metal open waveguide to operate in the target frequency band, the reference calculation formula for the wide side and narrow side lengths is: Wherein, W1 and W2 are the wide side and narrow side of the rectangular metal open waveguide, m and n are the mode numbers, and λ is the wavelength corresponding to the operating frequency.

2. The design method of a dielectric rod antenna based on a hybrid radiation mode according to claim 1, characterized in that: The matching section and the radiation section of the ceramic dielectric rod are tapered, and the dielectric constant of the ceramic material used is a high dielectric constant greater than 20.

3. The design method of a dielectric rod antenna based on a hybrid radiation mode according to claim 1, characterized in that: The coaxial probe is fixed on a dielectric-filled rectangular open waveguide through a metal flange. The probe length of the coaxial probe is adjustable to achieve antenna matching.

4. The design method of a dielectric rod antenna based on a hybrid radiation mode according to claim 1, characterized in that: The antenna structure also includes an anti-heat-insulation antenna cover, and the dielectric rod is embedded in the center position of the anti-heat-insulation antenna cover.

5. The design method of a dielectric rod antenna based on a hybrid radiation mode according to claim 4, characterized in that: The heat-insulating antenna cover comprises a heat-proof cover plate, which is connected to a square metal flange plate below to form a cover body. The cover body is filled with a heat-insulating layer, and a slot for installing an antenna is provided in the heat-insulating layer.

6. A design method for a dielectric rod antenna based on a hybrid radiation mode, characterized in that: include: Construct a dielectric rod antenna model; The dielectric rod antenna model includes: a ceramic dielectric rod and a dielectric-filled rectangular open waveguide, wherein the dielectric-filled rectangular open waveguide includes a rectangular metal open waveguide, the open waveguide is filled with dielectric, and the matching section of the ceramic dielectric rod is embedded in the filling dielectric; the inner conductor portion of the coaxial probe is inserted into the filling dielectric, and the coaxial probe is perpendicular to the transmission surface of the rectangular metal open waveguide; in this antenna structure, the dielectric-filled rectangular open waveguide not only serves as a waveguide feeding structure, but also participates in radiation as an open waveguide antenna, and both the open waveguide antenna and the dielectric rod antenna are end-fire radiation modes; Setting a hybrid radiation mode condition of the dielectric rod antenna model so that in a low-frequency band, the antenna structure uses open waveguide radiation as the main radiation mode, and the ceramic dielectric rod is used to improve radiation directivity, wherein the low-frequency band ranges from f0-0.8 GHz to f0; Using a finite integral algorithm, transient electromagnetic field simulations were performed to calculate the optimal antenna dimensions based on a dielectric rod antenna model and mixed radiation mode conditions. The distance from the coaxial probe feed point to the bottom of the rectangular metal open waveguide, as well as the lengths of the wide and narrow sides of the rectangular metal open waveguide, were optimized within a certain range based on reference values. The step of setting the mixed radiation mode condition of the dielectric rod antenna model includes: The distance from the coaxial probe feed point to the bottom of the rectangular metal open waveguide is designed. The reference value is calculated according to the following formula: Among them, L ref is the reference value of the distance from the coaxial probe to the bottom of the rectangular metal open waveguide, c is the speed of light in vacuum, f is the center frequency of the antenna, ε r is the dielectric constant of the medium filling the waveguide; When designing a rectangular metal open waveguide to operate in the target frequency band, the reference calculation formula for the wide side and narrow side lengths is: Wherein, W1 and W2 are the wide side and narrow side of the rectangular metal open waveguide, m and n are the mode numbers, and λ is the wavelength corresponding to the operating frequency.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for designing a dielectric rod antenna based on a hybrid radiation mode as claimed in claim 6 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for designing a dielectric rod antenna based on a hybrid radiation mode as claimed in claim 6 is implemented.

9. A computer program product comprising a computer program and / or instructions, characterized in that When the computer program / instruction is executed by a processor, the method for designing a dielectric rod antenna based on a hybrid radiation mode as claimed in claim 6 is implemented.

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