very low frequency antenna

简明释义

甚低频天线

英英释义

例句

1.The military relies on very low frequency antennas for secure long-range communications.

军方依赖于超低频天线进行安全的远程通信。

2.The research team installed a very low frequency antenna to improve communication with submarines.

研究小组安装了一个超低频天线以改善与潜艇的通信。

3.Scientists are studying the effects of ionospheric conditions on very low frequency antennas.

科学家正在研究电离层条件对超低频天线的影响。

4.In remote areas, a very low frequency antenna can provide reliable signals for emergency services.

在偏远地区，超低频天线可以为紧急服务提供可靠信号。

5.A very low frequency antenna is essential for transmitting signals through water.

一个超低频天线对于通过水传输信号至关重要。

作文

In the world of telecommunications, antennas play a crucial role in transmitting and receiving signals. One specific type of antenna is known as a very low frequency antenna (VLF antenna). These antennas are designed to operate at frequencies ranging from 3 kHz to 30 kHz, which is significantly lower than most other types of antennas used today. The design and functionality of a very low frequency antenna are particularly interesting due to their unique characteristics and applications.Firstly, the physical size of a very low frequency antenna is one of its most defining features. Because VLF waves have long wavelengths, the antennas must be quite large to be effective. In many cases, these antennas can be several hundred meters long. This poses challenges for installation and maintenance, especially in urban areas where space is limited. However, their large size allows them to effectively transmit signals over vast distances, making them ideal for certain applications.One of the primary uses of a very low frequency antenna is in submarine communication. The ability of VLF waves to penetrate water makes them invaluable for communicating with submarines that are submerged deep underwater. Traditional radio waves cannot reach these depths, but VLF signals can travel through the ocean, allowing for reliable communication with naval vessels. This capability is essential for military operations and ensuring the safety and coordination of submarine activities.Another important application of a very low frequency antenna is in time signal broadcasts. Many countries utilize VLF antennas to transmit time signals that synchronize clocks and other timing devices. For example, the United States National Institute of Standards and Technology (NIST) broadcasts time signals using VLF frequencies. This ensures that various systems, including GPS and telecommunications networks, maintain accurate timekeeping, which is critical for their operation.Despite their advantages, very low frequency antennas also come with some limitations. One significant challenge is their susceptibility to interference from natural phenomena, such as lightning storms. The low-frequency signals can be easily disrupted, leading to potential communication failures. Additionally, the large physical footprint of these antennas can make them impractical for some applications, particularly in densely populated areas.In conclusion, the very low frequency antenna is a specialized tool in the field of telecommunications that serves unique purposes, particularly in submarine communication and time signal broadcasting. While they have distinct advantages, such as long-range communication capabilities and the ability to penetrate water, they also face challenges related to size and interference. Understanding the role and function of a very low frequency antenna is essential for appreciating the complexities of modern communication technologies and their applications in various fields.

在电信领域，天线发挥着至关重要的作用，用于传输和接收信号。其中一种特定类型的天线被称为超低频天线（VLF天线）。这些天线设计用于在3 kHz到30 kHz的频率范围内工作，这远低于目前使用的大多数其他类型的天线。超低频天线的设计和功能因其独特的特性和应用而特别有趣。首先，超低频天线的物理尺寸是其最显著的特征之一。由于VLF波具有较长的波长，因此天线必须相当大才能有效。在许多情况下，这些天线可以长达几百米。这给安装和维护带来了挑战，尤其是在空间有限的城市地区。然而，它们的大尺寸使它们能够有效地在广阔的距离上传输信号，使其在某些应用中非常理想。超低频天线的主要用途之一是在潜艇通信中。VLF波穿透水域的能力使其在与深水潜艇进行可靠通信时不可或缺。传统的无线电波无法达到这些深度，但VLF信号可以通过海洋传播，从而允许与海军舰艇之间的可靠通信。这种能力对于军事行动及确保潜艇活动的安全和协调至关重要。超低频天线的另一个重要应用是时间信号广播。许多国家利用VLF天线发射时间信号，以同步时钟和其他计时设备。例如，美国国家标准与技术研究院（NIST）使用VLF频率广播时间信号。这确保了包括GPS和电信网络在内的各种系统保持准确的计时，这对它们的操作至关重要。尽管有其优势，超低频天线也存在一些局限性。一个重大挑战是它们容易受到自然现象（如雷暴）的干扰。低频信号容易受到干扰，可能导致通信失败。此外，这些天线的大物理占地面积可能使其在某些应用中不切实际，特别是在密集人口区域。总之，超低频天线是电信领域中的一种专业工具，具有独特的目的，特别是在潜艇通信和时间信号广播中。虽然它们具有独特的优势，如长距离通信能力和穿透水域的能力，但也面临与尺寸和干扰相关的挑战。理解超低频天线的角色和功能对于欣赏现代通信技术的复杂性及其在各个领域的应用至关重要。