技术领域technical field
本发明属于低频通讯领域，更具体地，涉及一种磁电天线及其基于等效电路模型的调谐方法。The invention belongs to the field of low-frequency communication, and more specifically relates to a magnetoelectric antenna and its tuning method based on an equivalent circuit model.
背景技术Background technique
磁电天线是一种基于振动磁偶极子直接产生电磁信号的新型低频机械天线，在岸对潜、水下和地下通信等领域具有巨大的发展潜力。Magnetoelectric antenna is a new type of low-frequency mechanical antenna based on vibrating magnetic dipoles to directly generate electromagnetic signals. It has great development potential in the fields of shore-to-submarine, underwater and underground communications.
现有技术中，磁电天线一般为不可调整谐振频率的成品，其谐振频率随着加工完成而确定。磁电天线的工作原理与电天线不同，电学领域对电天线进行阻抗匹配的调谐方法也不能适用于磁电天线。因此，在不改变磁电天线辐射体结构的前提下，如何对其进行精确调谐，是目前亟需解决的难题。In the prior art, the magnetoelectric antenna is generally a finished product whose resonant frequency cannot be adjusted, and its resonant frequency is determined upon completion of processing. The working principle of the magnetoelectric antenna is different from that of the electric antenna, and the tuning method for impedance matching of the electric antenna in the field of electricity cannot be applied to the magnetoelectric antenna. Therefore, under the premise of not changing the structure of the magnetoelectric antenna radiator, how to precisely tune it is a problem that needs to be solved urgently.
发明内容Contents of the invention
针对现有技术的以上缺陷或改进需求，本发明提供了一种磁电天线及其基于等效电路模型的调谐方法，可实现磁电天线的精确调谐。In view of the above defects or improvement needs of the prior art, the present invention provides a magnetoelectric antenna and its tuning method based on an equivalent circuit model, which can realize precise tuning of the magnetoelectric antenna.
为实现上述目的，按照本发明的一个方面，提供了一种基于等效电路模型的磁电天线调谐方法，所述磁电天线包括磁电天线本体和负载，所述负载设于所述磁电天线本体的端部，通过调节所述负载的总质量、所述磁电天线本体的总弹性系数来调节所述磁电天线的上截止频率、下截止频率和带宽，使得所述磁电天线的上截止频率、下截止频率和带宽达到目标值，调节后所述负载的总质量、所述磁电天线本体的总弹性系数满足：In order to achieve the above object, according to one aspect of the present invention, a magnetoelectric antenna tuning method based on an equivalent circuit model is provided, the magnetoelectric antenna includes a magnetoelectric antenna body and a load, and the load is arranged on the magnetoelectric The end of the antenna body adjusts the upper cut-off frequency, the lower cut-off frequency and the bandwidth of the magnetoelectric antenna by adjusting the total mass of the load and the total elastic coefficient of the magnetoelectric antenna body, so that the magnetoelectric antenna The upper cut-off frequency, the lower cut-off frequency and the bandwidth reach the target value, and the total mass of the load after adjustment and the total elastic coefficient of the magnetoelectric antenna body satisfy:
其中，M为调节后负载的总质量，K为调节后磁电天线本体的总弹性系数，fH'为所述上截止频率的目标值，fL'为所述下截止频率的目标值，B'为所述带宽的目标值，R为所述磁电天线的阻尼。Wherein, M is the total mass of the load after adjustment, K is the total elastic coefficient of the magnetoelectric antenna body after adjustment, fH ' is the target value of the upper cut-off frequency, and fL ' is the target value of the lower cut-off frequency, B' is the target value of the bandwidth, and R is the damping of the magnetoelectric antenna.
进一步地，通过向所述负载添加质量来调节所述负载的总质量，所述负载自身的质量为m1，向所述负载添加的质量为m2，m1、m2满足：Further, the total mass of the load is adjusted by adding mass to the load, the mass of the load itself is m1 , the mass added to the load is m2 , and m1 and m2 satisfy:
进一步地，通过为所述磁电天线本体并联弹性材料来调节所述磁电天线本体的总弹性系数，所述磁电天线本体自身的弹性系数为k1，所述弹性材料的弹性系数为k2，k1、k2满足：Further, the total elasticity coefficient of the magnetoelectric antenna body is adjusted by connecting the elastic material in parallel with the magnetoelectric antenna body, the elasticity coefficient of the magnetoelectric antenna body itself is k1 , and the elasticity coefficient of the elastic material is k2 , k1 , k2 satisfy:
进一步地，所述弹性材料为弹力龙骨片。Further, the elastic material is an elastic keel piece.
进一步地，通过多层天线贴合来调节所述磁电天线本体的总弹性系数。Further, the total elastic coefficient of the magnetoelectric antenna body is adjusted by laminating multiple layers of antennas.
进一步地，所述磁电天线本体包括沿预设方向依次设置的密闭气体腔部、电致伸缩部、机械振动传导部和压磁部，通过改变所述密闭气体腔部腔内的气压来调节所述磁电天线本体的总弹力系数。Further, the magnetoelectric antenna body includes a closed gas chamber part, an electrostrictive part, a mechanical vibration conduction part and a piezomagnetic part arranged in sequence along a predetermined direction, and the air pressure in the airtight gas chamber part can be adjusted by changing the air pressure in the airtight gas chamber part. The total elastic coefficient of the magnetoelectric antenna body.
进一步地，通过动态调节所述负载的质量、所述磁电天线本体的弹性系数使得所述磁电天线的谐振频率始终保持为频率调制所需的频率。Further, by dynamically adjusting the mass of the load and the elastic coefficient of the magnetoelectric antenna body, the resonant frequency of the magnetoelectric antenna is always kept at the frequency required for frequency modulation.
按照本发明的第二方面，提供了一种磁电天线，所述磁电天线包括磁电天线本体和负载，所述负载设于所述磁电天线本体的端部，通过调节所述负载的总质量、所述磁电天线本体的总弹性系数来调节所述磁电天线的上截止频率、下截止频率和带宽，使得所述磁电天线的上截止频率、下截止频率和带宽达到目标值，调节后所述负载的总质量、所述磁电天线本体的总弹性系数满足：According to the second aspect of the present invention, a magnetoelectric antenna is provided. The magnetoelectric antenna includes a magnetoelectric antenna body and a load. The load is arranged at the end of the magnetoelectric antenna body. By adjusting the The total mass and the total elastic coefficient of the magnetoelectric antenna body are used to adjust the upper cutoff frequency, the lower cutoff frequency and the bandwidth of the magnetoelectric antenna, so that the upper cutoff frequency, the lower cutoff frequency and the bandwidth of the magnetoelectric antenna reach the target value , the total mass of the load after adjustment and the total elastic coefficient of the magnetoelectric antenna body satisfy:
其中，M为调节后负载的总质量，K为调节后磁电天线本体的总弹性系数，fH'为所述上截止频率的目标值，fL'为所述下截止频率的目标值，B'为所述带宽的目标值，R为所述磁电天线的阻尼。Wherein, M is the total mass of the load after adjustment, K is the total elastic coefficient of the magnetoelectric antenna body after adjustment, fH ' is the target value of the upper cut-off frequency, and fL ' is the target value of the lower cut-off frequency, B' is the target value of the bandwidth, and R is the damping of the magnetoelectric antenna.
进一步地，所述磁电天线本体包括沿预设方向依次设置的密闭气体腔部、电致伸缩部、机械振动传导部和压磁部，通过改变所述密闭气体腔部腔内的气压来调节所述磁电天线本体的总弹力系数。Further, the magnetoelectric antenna body includes a closed gas chamber part, an electrostrictive part, a mechanical vibration conduction part and a piezomagnetic part arranged in sequence along a predetermined direction, and the air pressure in the airtight gas chamber part can be adjusted by changing the air pressure in the airtight gas chamber part. The total elastic coefficient of the magnetoelectric antenna body.
进一步地，在所述密闭气体腔部的与所述电致伸缩部相对的另一端部设置有用于固定所述磁电天线本体的固定基座。Further, a fixing base for fixing the magnetoelectric antenna body is provided at the other end of the airtight gas chamber part opposite to the electrostrictive part.
总体而言，本发明所构思的以上技术方案与现有技术相比，可以实现磁电天线在生产定型之后的动态调谐，有利于优化偏离预定工作频率的天线，具有十分广阔的应用价值，例如对使用频率调制的磁电天线，可以在发信过程中，同步、动态地调整天线谐振频率，使天线时刻保持工作在谐振频点；对于有着远距离通信、大批量组阵需求的磁电天线，动态调谐技术能够将不同的天线阵元，调谐到相同的工作频点，提高阵列的辐射效率。Generally speaking, compared with the prior art, the above technical solution conceived by the present invention can realize the dynamic tuning of the magnetoelectric antenna after production and shaping, which is beneficial to optimize the antenna deviated from the predetermined operating frequency, and has very broad application value, for example For magnetoelectric antennas using frequency modulation, the resonant frequency of the antenna can be adjusted synchronously and dynamically during the sending process, so that the antenna can always work at the resonant frequency point; for magnetoelectric antennas with long-distance communication and large-scale array requirements , the dynamic tuning technology can tune different antenna elements to the same operating frequency point, and improve the radiation efficiency of the array.
附图说明Description of drawings
图1是本发明实施例的磁电天线的等效振动模型；Fig. 1 is the equivalent vibration model of the magnetoelectric antenna of the embodiment of the present invention;
图2是本发明实施例的磁电天线的等效电路模型；Fig. 2 is the equivalent circuit model of the magnetoelectric antenna of the embodiment of the present invention;
图3是本发明实施例的添加负载的磁电天线的等效电路模型；Fig. 3 is the equivalent circuit model of the magnetoelectric antenna of the added load of the embodiment of the present invention;
图4是本发明实施例的添加弹性材料的磁电天线的等效电路模型。FIG. 4 is an equivalent circuit model of a magnetoelectric antenna with elastic material added according to an embodiment of the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
本发明实施例中术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或模块的过程、方法、装置、产品或设备不必限于清楚地列出的那些步骤或模块，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或模块。The terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, device, product or equipment that includes a series of steps or modules is not necessarily limited to expressly Instead, other steps or modules not explicitly listed or inherent to the process, method, product or apparatus may be included.
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本发明的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.
本发明提供了一种磁电天线及其基于等效电路模型的调谐方法，以下分别进行说明。The present invention provides a magnetoelectric antenna and its tuning method based on an equivalent circuit model, which will be described respectively below.
本发明实施例的一种基于等效电路模型的磁电天线调谐方法，首先通过磁电天线的振动模型，建立RLC串联谐振等效电路模型，将磁电天线的弹力系数、负载和阻尼分别等效为电路中的物理量，以达成精确调谐的目的。According to a magnetoelectric antenna tuning method based on an equivalent circuit model in an embodiment of the present invention, the RLC series resonance equivalent circuit model is first established through the vibration model of the magnetoelectric antenna, and the elastic coefficient, load and damping of the magnetoelectric antenna are respectively The effect is a physical quantity in the circuit to achieve the purpose of precise tuning.
磁电天线包括磁电天线本体和负载，磁电天线本体即为磁电天线除负载以外的部分，所述负载设于所述磁电天线本体的端部，磁电天线的振动模型如图1所示。The magnetoelectric antenna includes a magnetoelectric antenna body and a load. The magnetoelectric antenna body is the part of the magnetoelectric antenna except the load. The load is arranged at the end of the magnetoelectric antenna body. The vibration model of the magnetoelectric antenna is as shown in Figure 1 shown.
基于此振动模型，可知理想轻质磁电天线的谐振频率计算公式：Based on this vibration model, the formula for calculating the resonant frequency of an ideal lightweight magnetoelectric antenna is:
其中，m为理想轻质磁电天线的负载质量，k为想轻质磁电天线的弹力系数。基于式(1)，可以完成理想轻质磁电天线的定性调谐。例如，增加负载，频率降低；提高弹力系数，谐振频率升高。式(1)是建立在理想的线性轻质弹簧的基础上，不能直接应用于计算实际中的机械天线多阶谐振频率。Among them, m is the load mass of the ideal lightweight magnetoelectric antenna, and k is the elastic coefficient of the ideal lightweight magnetoelectric antenna. Based on formula (1), the qualitative tuning of the ideal lightweight magnetoelectric antenna can be completed. For example, increasing the load reduces the frequency; increasing the elastic coefficient increases the resonant frequency. Equation (1) is based on an ideal linear light spring and cannot be directly applied to calculate the multi-order resonance frequency of a mechanical antenna in practice.
但根据式(1)，可以进一步建立磁电天线的等效电路模型。将式(1)进一步改写为式(2)。But according to formula (1), the equivalent circuit model of the magnetoelectric antenna can be further established. Formula (1) is further rewritten as formula (2).
因为磁电天线的振动系统中，能量仅由天线振动消耗，所以将磁电天线的振动模型等效为串联谐振电路。因为磁电天线与弹力龙骨并联时，总弹力系数由二者弹力系数叠加而成，故式(2)中，k-1可类比为电路中的电容；因为磁电天线的负载在增加时为串联式直接叠加，故m可类比为电路中的电感；天线本身阻尼类比为等效电阻；振幅类比为电路中的电流幅度。Because in the vibration system of the magnetoelectric antenna, the energy is only consumed by the vibration of the antenna, so the vibration model of the magnetoelectric antenna is equivalent to a series resonant circuit. Because when the magnetoelectric antenna and the elastic keel are connected in parallel, the total elastic coefficient is formed by the superposition of the two elastic coefficients, so in formula (2), k-1 can be compared to the capacitance in the circuit; because the load of the magnetoelectric antenna increases as The series type is directly superimposed, so m can be compared to the inductance in the circuit; the damping of the antenna itself can be compared to the equivalent resistance; the amplitude can be compared to the current amplitude in the circuit.
图2为磁电天线的等效电路模型。Figure 2 is the equivalent circuit model of the magnetoelectric antenna.
基于等效电路模型，可得磁电天线的谐振频率f(2)、下截止频率fL(3)、上截止频率fH(4)和带宽B(5)计算公式。Based on the equivalent circuit model, the formulas for resonant frequency f(2), lower cutoff frequency fL (3), upper cutoff frequency fH (4) and bandwidth B(5) of the magnetoelectric antenna can be obtained.
其中，R为所述磁电天线的阻尼，L＝m，C＝k-1。Wherein, R is the damping of the magnetoelectric antenna, L=m, C=k−1 .
通过调节负载的总质量、磁电天线本体的总弹性系数来调节磁电天线的上截止频率、下截止频率和带宽，使得磁电天线的上截止频率、下截止频率和带宽达到目标值。By adjusting the total mass of the load and the total elastic coefficient of the magnetoelectric antenna body, the upper cutoff frequency, lower cutoff frequency and bandwidth of the magnetoelectric antenna are adjusted, so that the upper cutoff frequency, lower cutoff frequency and bandwidth of the magnetoelectric antenna reach the target value.
调节后负载的总质量、磁电天线本体的总弹性系数满足：The total mass of the adjusted load and the total elastic coefficient of the magnetoelectric antenna body satisfy:
其中，M为调节后负载的总质量，K为调节后磁电天线本体的总弹性系数，fH'为所述上截止频率的目标值，fL'为所述下截止频率的目标值，B'为所述带宽的目标值。Wherein, M is the total mass of the load after adjustment, K is the total elastic coefficient of the magnetoelectric antenna body after adjustment, fH ' is the target value of the upper cut-off frequency, and fL ' is the target value of the lower cut-off frequency, B' is the target value of the bandwidth.
在不改变磁电天线辐射体结构的情况下，有多种可选的方式来调节负载的总质量或磁电天线本体的总弹性系数。There are many optional ways to adjust the total mass of the load or the total elastic coefficient of the magnetoelectric antenna body without changing the structure of the magnetoelectric antenna radiator.
例如，可以通过向负载添加质量的方式来改变负载的总质量。For example, you can change the total mass of a load by adding mass to it.
图3为添加负载的磁电天线的等效电路模型，R1为磁电天线等效电阻，L1为磁电天线等效电感，k1为磁电天线本体自身的弹性系数，m1为负载自身的质量，m2为向负载添加的物体(例如砝码)质量，L2为负载添加的物体的等效电感。图3中，满足：Fig. 3 is the equivalent circuit model of the magnetoelectric antenna with added load,R1 is the equivalent resistance of the magnetoelectric antenna,L1 is the equivalent inductance of the magnetoelectric antenna,k1 is the elastic coefficient of the magnetoelectric antenna itself, andm1 is The mass of the load itself, m2 is the mass of the object (such as a weight) added to the load, and L2 is the equivalent inductance of the object added to the load. In Figure 3, satisfy:
还例如，通过为磁电天线本体并联弹力龙骨片等弹性材料的方式，来调节磁电天线本体的总弹性系数。For another example, the total elastic coefficient of the magnetoelectric antenna body can be adjusted by connecting elastic materials such as elastic keel pieces in parallel to the magnetoelectric antenna body.
图4为添加弹力龙骨片的磁电天线等效电路模型。C2为弹性材料的等效电容，k2为并联的弹性材料的弹性系数。Figure 4 is the equivalent circuit model of the magnetoelectric antenna with elastic keel added. C2 is the equivalent capacitance of the elastic material, and k2 is the elastic coefficient of the elastic material connected in parallel.
满足：satisfy:
例如，通过多层天线贴合来调节磁电天线本体的总弹性系数，即通过多个磁电天线本体并联来调节磁电天线本体的总弹性系数。For example, the total elastic coefficient of the magnetoelectric antenna body is adjusted by laminating multiple layers of antennas, that is, the total elastic coefficient of the magnetoelectric antenna body is adjusted by connecting multiple magnetoelectric antenna bodies in parallel.
当然，也可以同时调节负载的总质量、磁电天线本体的总弹性系数。M＝m1+m2，K＝k1+k2。Of course, the total mass of the load and the total elastic coefficient of the magnetoelectric antenna body can also be adjusted at the same time. M=m1 +m2 , K=k1 +k2 .
在另一个实施例中，磁电天线本体包括沿预设方向依次设置的密闭气体腔部、电致伸缩部、机械振动传导部和压磁部，通过改变所述密闭气体腔部腔内的气压来调节所述磁电天线本体的弹力系数。气压越大，弹力系数越高。In another embodiment, the magnetoelectric antenna body includes a sealed gas chamber part, an electrostrictive part, a mechanical vibration conduction part and a piezomagnetic part arranged in sequence along a preset direction, by changing the air pressure in the sealed gas chamber part to adjust the elastic coefficient of the magnetoelectric antenna body. The greater the air pressure, the higher the coefficient of elasticity.
密闭气体腔部，用于通过改变腔内的气压从而调节磁电天线本体的弹力系数，还用于在与电致伸缩部的交界面全反射电致伸缩部产生的机械振动波从而降低机械天线的机械能损耗。电致伸缩部包括电致伸缩材料本体和电极，用于通过将电极提供的电能通过电致伸缩材料本体转换为机械能。机械振动传导部，用于将来源于电致伸缩部的机械振动波传导给压磁部。压磁部，用于将通过机械振动传导部传导过来的机械能转换为磁能。The airtight gas cavity is used to adjust the elastic coefficient of the magnetoelectric antenna body by changing the air pressure in the cavity, and is also used to totally reflect the mechanical vibration wave generated by the electrostrictive part at the interface with the electrostrictive part to reduce the mechanical antenna mechanical energy loss. The electrostrictive part includes an electrostrictive material body and electrodes for converting electrical energy provided by the electrodes into mechanical energy through the electrostrictive material body. The mechanical vibration conducting part is used to conduct the mechanical vibration wave originating from the electrostrictive part to the piezomagnetic part. The piezomagnetic part is used to convert the mechanical energy transmitted through the mechanical vibration conducting part into magnetic energy.
上述基于等效电路模型的磁电天线调谐方法，具有十分广阔的应用价值。例如对使用频率调制的磁电天线，可以在发信过程中，同步、动态地调整天线谐振频率，使天线时刻保持工作在谐振频点，即通过动态调节所述负载的质量、所述磁电天线本体的弹性系数使得所述磁电天线的谐振频率始终保持为频率调制所需的频率。另外，对于有着远距离通信、大批量组阵需求的磁电天线，动态调谐技术能够将不同的天线阵元，调谐到相同的工作频点，提高阵列的辐射效率。The above-mentioned magnetoelectric antenna tuning method based on the equivalent circuit model has very broad application value. For example, for a magnetoelectric antenna that uses frequency modulation, the resonant frequency of the antenna can be adjusted synchronously and dynamically during the sending process, so that the antenna can always work at the resonant frequency point, that is, by dynamically adjusting the quality of the load, the magnetoelectric The elastic coefficient of the antenna body keeps the resonant frequency of the magnetoelectric antenna always at the frequency required for frequency modulation. In addition, for magnetoelectric antennas with long-distance communication and large-scale array requirements, dynamic tuning technology can tune different antenna elements to the same operating frequency point to improve the radiation efficiency of the array.
仿真结果如下：The simulation results are as follows:
以长为100mm、宽20mm、厚0.5mm的PZT-5H/Metglas型磁电天线为例，经测量可得弹力系数为471720N/m。Taking the PZT-5H/Metglas magnetoelectric antenna with a length of 100mm, a width of 20mm and a thickness of 0.5mm as an example, the measured elastic coefficient is 471720N/m.
表1文中符号含义及数值Meanings and values of symbols in Table 1
分别计算其砝码负载为0.03Kg、0.06Kg、0.09Kg、0.12Kg时的谐振频率。Calculate the resonant frequency when the weight load is 0.03Kg, 0.06Kg, 0.09Kg, 0.12Kg respectively.
表2不同机械负载条件下的固有频率计算结果Table 2 Calculation results of natural frequencies under different mechanical load conditions
通过添加龙骨式弹片和多层天线贴合的方式改变天线模型的弹力系数分别为：535000N/m、830000N/m、890000N/m、1000000N/m、1500000N/m分别计算其负载为0.03Kg时的谐振频率。计算结果如表3所示。Change the elastic coefficient of the antenna model by adding keel-type shrapnel and multi-layer antenna bonding: 535000N/m, 830000N/m, 890000N/m, 1000000N/m, 1500000N/m, respectively, when the load is 0.03Kg Resonant frequency. The calculation results are shown in Table 3.
表3不同弹力系数条件下的固有频率计算结果Table 3 Calculation results of natural frequencies under different elastic coefficients
实验得到待测试样品在不同机械负载条件下的谐振频率。测试结果如表4所示。The resonant frequencies of the samples to be tested under different mechanical load conditions were obtained experimentally. The test results are shown in Table 4.
表4不同机械负载条件下的固有频率测试结果Table 4 Natural frequency test results under different mechanical load conditions
实验结果与理论结果相符，随着机械负载的升高，机械天线谐振频率随之下降。在目前的实验室条件下，能够进行-50％～0的频点调整；通过更换不同的机械负载条件，例如更换拉力更大的弹簧，提高固定约束模块的位移上限等，理论上天线的谐振频点能够接近0Hz；在不同的机械负载条件下，天线振动的带宽能够保持稳定。The experimental results are consistent with the theoretical results. As the mechanical load increases, the resonant frequency of the mechanical antenna decreases. Under the current laboratory conditions, it is possible to adjust the frequency point from -50% to 0; by changing different mechanical load conditions, such as changing springs with greater tension, increasing the upper limit of displacement of fixed constraint modules, etc., theoretically, the resonance of the antenna The frequency point can be close to 0Hz; under different mechanical load conditions, the bandwidth of antenna vibration can be kept stable.
实验得到待测试样品在不同弹性系数下的谐振频率如表5所示。The resonant frequencies of the samples to be tested under different elastic coefficients obtained from the experiment are shown in Table 5.
表5不同弹力系数条件下的固有频率测试结果Table 5 Natural frequency test results under different elastic coefficient conditions
根据实验结果可知，随着机械天线弹力系数的提高，谐振频点随之上升，这与理论结果相符。在实验室条件下，通过调整天线弹力系数的方式，能够对天线谐振频率进行0～75％的调整，扩展0～207％的带宽；通过更换不同的弹力系数条件，例如更换弹力系数更大的龙骨，增加天线的复合层数等，理论上频点偏移范围和带宽能够实现更大幅度提升。According to the experimental results, it can be seen that with the increase of the elastic coefficient of the mechanical antenna, the resonant frequency point increases, which is consistent with the theoretical results. Under laboratory conditions, by adjusting the elastic coefficient of the antenna, the resonant frequency of the antenna can be adjusted by 0-75%, and the bandwidth of 0-207% can be expanded; by changing different elastic coefficient conditions, such as changing the elastic coefficient Theoretically, the frequency point offset range and bandwidth can be greatly improved.
本发明另一实施例的磁电天线包括磁电天线本体和负载，所述负载设于所述磁电天线本体的端部，通过调节所述负载的总质量、所述磁电天线本体的总弹性系数来调节所述磁电天线的上截止频率、下截止频率和带宽，使得所述磁电天线的上截止频率、下截止频率和带宽达到目标值，调节后所述负载的总质量、所述磁电天线本体的总弹性系数满足：The magnetoelectric antenna according to another embodiment of the present invention includes a magnetoelectric antenna body and a load. The load is arranged at the end of the magnetoelectric antenna body. The elastic coefficient is used to adjust the upper cut-off frequency, the lower cut-off frequency and the bandwidth of the magnetoelectric antenna, so that the upper cut-off frequency, the lower cut-off frequency and the bandwidth of the magnetoelectric antenna reach the target value, the total mass of the load after adjustment, the The total elastic coefficient of the magnetoelectric antenna body satisfies:
其中，M为调节后负载的总质量，K为调节后磁电天线本体的总弹性系数，fH'为所述上截止频率的目标值，fL'为所述下截止频率的目标值，B'为所述带宽的目标值。Wherein, M is the total mass of the load after adjustment, K is the total elastic coefficient of the magnetoelectric antenna body after adjustment, fH ' is the target value of the upper cut-off frequency, and fL ' is the target value of the lower cut-off frequency, B' is the target value of the bandwidth.
进一步地，所述磁电天线本体包括沿预设方向依次设置的密闭气体腔部、电致伸缩部、机械振动传导部和压磁部，通过改变所述密闭气体腔部腔内的气压来调节所述磁电天线本体的总弹力系数。Further, the magnetoelectric antenna body includes a closed gas chamber part, an electrostrictive part, a mechanical vibration conduction part and a piezomagnetic part arranged in sequence along a predetermined direction, and the air pressure in the airtight gas chamber part can be adjusted by changing the air pressure in the airtight gas chamber part. The total elastic coefficient of the magnetoelectric antenna body.
进一步地，所述磁电天线在所述密闭气体腔部的与所述电致伸缩部相对的另一端部设置有用于固定所述磁电天线本体的固定基座。Further, the magnetoelectric antenna is provided with a fixing base for fixing the magnetoelectric antenna body at the other end of the airtight gas chamber part opposite to the electrostrictive part.
上述磁电天线的原理、效果与上述磁电天线调谐方法的原理、效果相同，此处不在赘述。The principle and effect of the above-mentioned magnetoelectric antenna are the same as those of the above-mentioned magnetoelectric antenna tuning method, and will not be repeated here.
本领域的技术人员容易理解，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.
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| CN202310557248.7ACN116632498A (en) | 2023-05-17 | 2023-05-17 | Magneto-electric antenna and tuning method based on equivalent circuit model thereof |
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| CN117712669A (en)* | 2023-12-11 | 2024-03-15 | 中国人民解放军海军工程大学 | A binary parallel array of magnetoelectric antenna and its equivalent circuit model establishment method |
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