CN108933335A - 一种调控雷达吸波材料吸收频率的新方法 - Google Patents
一种调控雷达吸波材料吸收频率的新方法 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/007—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with means for controlling the absorption
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
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Abstract
本发明公开了一种调控雷达吸波材料吸收频率的新方法，包括如下步骤：S1、采用PET材料制作柔性衬底；S2、采用磁控溅射镀膜方法，在弯曲的柔性衬底PET上沉积FeGa薄膜，PET衬底恢复平整后，FeGa薄膜受到预应力作用，通过光刻技术，制备出FeGa条带结构；S3、在FeGa条带中施加不同程度的预应力；S4、通过对衬底材料PET施加应力，进行FeGa条带的吸波频率的改变。本发明解决了以往吸波材料共振吸收频率固定单一的问题，极大的扩展了吸波材料的应用领域，对于国防战斗机隐形技术以及日常电磁设备屏蔽维护，都具有重要的实用价值。
Description
技术领域
本发明涉及雷达吸波材料制备领域，具体涉及一种调控雷达吸波材料吸收频率的新方法。
背景技术
随着隐身技术的发展，吸波材料成为世界各国研究的重点，吸波材料能够有效的提升武器装备的系统生存能力和作战能力。日常生活中，为了有效的防护电子设备辐射电磁波，也需要使用吸波材料来进行电磁屏蔽。然而，实际应用过程中，电磁波的频率会因为使用场景的不同而发生改变，这就要求吸波材料具有灵活的可调的吸收频率。目前，关于吸波材料中吸收频率动态可调的专利依然十分少见。
发明内容
为解决上述问题，本发明提供了一种调控雷达吸波材料吸收频率的新方法，将柔性衬底与磁致伸缩条带相结合，选用高延展性，高磁致伸缩，耐冲击，机械性能优异的FeGa这一新颖材料，实现微波共振吸收频率动态可调，在雷达吸波隐身以及电磁屏蔽方面具有十分重要的应用价值。
为实现上述目的，本发明采取的技术方案为：
一种调控雷达吸波材料吸收频率的新方法，包括如下步骤：
S1、采用PET材料制作柔性衬底；
S2、采用磁控溅射镀膜方法，在弯曲的PET上沉积FeGa薄膜，PET衬底恢复平整后，FeGa薄膜受到预应力作用，通过光刻技术，制备出FeGa条带结构；
S3、在FeGa条带中施加不同程度的预应力；将柔性PET衬底弯曲在不同曲率半径的圆弧曲面上，沉积FeGa薄膜后，将PET衬底展平，FeGa薄膜中就会受到不同程度的应力。应力主要来源于弯曲的PET在恢复平整状态后产生的应变，应变通界面传递给FeGa薄膜，从而在薄膜中产生应力。
S4、通过对衬底材料PET施加应力，由于PET衬底可以自由弯曲，因此，可以通过相关拉伸或压缩机械装置，对薄膜衬底施加应力，PET衬底在外加机械应力的作用下发生形变，由于FeGa薄膜与PET结合紧密，从而FeGa薄膜也会产生应变，从而达到动态调控FeGa条带的吸波频率。
本发明解决了以往吸波材料共振吸收频率固定单一的问题，极大的扩展了吸波材料的应用领域，对于国防战斗机隐形技术以及日常电磁设备屏蔽维护，都具有重要的实用价值。
附图说明
图1为不同应力状态下，FeGa条带的磁化率随磁场频率的变化关系曲线。
图2为不同应力状态下，FeGa磁化率共振峰的频率随应力的变化关系汇总图。插图显示了应力施加在FeGa条带的宽度方向，磁场沿条带宽度方向并平行于FeGa条带平面。
具体实施方式
为了使本发明的目的及优点更加清楚明白，以下结合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。
本发明实施例的一种调控雷达吸波材料吸收频率的新方法，包括如下步骤：
S1、采用PET材料制作柔性衬底；
S2、采用磁控溅射镀膜方法，在PET上沉积FeGa薄膜，通过光刻技术，制备出FeGa条带结构；
S3、在FeGa条带中施加不同程度的预应力；
S4、通过对衬底材料PET施加应力，应力由衬底传递到FeGa条带中，由于逆磁致伸缩效应，FeGa条带的磁化状态发生改变，应力在FeGa条带中诱导出单轴各向异性，根据Kittle公式，FeGa条带的共振频率由于局域的有效场发生改变而产生变化，从而，FeGa条带的吸波频率发生移动。
如图1所示，FeGa条带在应力作用下，共振吸收峰产生了移动，箭头所指方向为应力从压应力逐渐增大为张应力的变化过程。在张应力的作用下，共振吸收峰从17.25GHz降到了15.25GHz，也就是说，FeGa条带共振吸收峰在0～70.85MPa的张应力作用下，实现了15.25～17.25GHz的频率可调。类似的，在压应力从0～70.85MPa的范围内变化时，FeGa条带共振吸收峰从17.25GHz增加到19.0GHz。由此可见，FeGa条带的共振吸收峰频率可调范围为～4.0GHz。极大的拓展了雷达吸波材料的应用范围。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。
Claims (1)
1.一种调控雷达吸波材料吸收频率的新方法，其特征在于：包括如下步骤：
S1、采用PET材料制作柔性衬底；
S2、采用磁控溅射镀膜方法，在弯曲的柔性衬底PET上沉积FeGa薄膜，通过光刻技术，制备出FeGa条带结构；
S3、在FeGa条带中施加不同程度的预应力；将柔性PET衬底弯曲在不同曲率半径的圆弧曲面上，沉积FeGa薄膜后，将PET衬底展平；
S4、通过机械装置拉伸或压缩衬底材料PET，从而对FeGa条带施加张应力或压应力，进行FeGa条带的吸波频率的改变。
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| CN113088894A (zh) * | 2021-03-26 | 2021-07-09 | 电子科技大学 | 一种应力诱导提高薄膜应用频率的薄膜制备方法 |
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| CN113088894A (zh) * | 2021-03-26 | 2021-07-09 | 电子科技大学 | 一种应力诱导提高薄膜应用频率的薄膜制备方法 |
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