half-wave antenna

简明释义

半波天线

英英释义

例句

1.Many mobile devices utilize a half-wave antenna 半波天线 for better reception.

许多移动设备利用 半波天线 half-wave antenna 来获得更好的接收效果。

2.The design of a half-wave antenna 半波天线 is simple and cost-effective for amateur radio operators.

对于业余无线电爱好者来说，半波天线 half-wave antenna 的设计简单且经济实惠。

3.A half-wave antenna 半波天线 can be used to improve signal strength in urban areas.

在城市地区，可以使用 半波天线 half-wave antenna 来提高信号强度。

4.When tuning a half-wave antenna 半波天线, it's important to adjust the length accurately.

调谐 半波天线 half-wave antenna 时，准确调整长度非常重要。

5.The half-wave antenna 半波天线 is commonly used in television broadcasting.

在电视广播中，半波天线 half-wave antenna 是常用的天线类型。

作文

The field of telecommunications has seen remarkable advancements over the years, and one of the fundamental components that play a crucial role in this domain is the antenna. Among various types of antennas, the half-wave antenna stands out due to its simplicity and efficiency. A half-wave antenna (半波天线) is designed to be half the wavelength of the frequency it is intended to transmit or receive. This design allows for optimal performance, making it a popular choice among amateur radio enthusiasts and professionals alike.The basic principle behind a half-wave antenna is that it resonates at the frequency of the signal it is handling. When an alternating current flows through the antenna, it creates an electromagnetic field that propagates through space. The length of the antenna is critical; if it is too short or too long, the efficiency of transmission and reception can significantly decrease. Typically, a half-wave antenna measures approximately 468 divided by the frequency in megahertz (MHz). For instance, if you are working with a frequency of 144 MHz, the ideal length of your antenna would be around 3.25 feet.One of the significant advantages of a half-wave antenna is its radiation pattern. It typically exhibits a broadside radiation pattern, which means it radiates energy more effectively in a direction perpendicular to the antenna itself. This characteristic makes it particularly useful for applications where coverage in a specific direction is required. Additionally, the half-wave antenna tends to have a relatively high gain compared to other types of antennas, which translates to better signal strength and quality.Another aspect worth noting is the ease of construction. A half-wave antenna can be built using simple materials, such as copper wire or aluminum tubing, making it accessible for hobbyists who enjoy DIY projects. This simplicity does not compromise performance; many operators have reported excellent results using homemade half-wave antennas in various settings.However, like any technology, the half-wave antenna has its limitations. For example, it may not perform well in environments with significant physical obstructions, such as buildings or large trees. In these cases, other antenna designs, such as directional antennas, might be more effective. Additionally, while a half-wave antenna is versatile, it is primarily suited for specific frequency bands, and operators often need to adjust their setup when changing frequencies.In conclusion, the half-wave antenna is a vital element in the world of radio communication. Its straightforward design, efficient performance, and ease of construction make it a favored choice among both amateurs and professionals. Understanding how to effectively utilize a half-wave antenna can greatly enhance one's experience in the realm of wireless communication. As technology continues to evolve, the principles that govern antennas like the half-wave antenna remain foundational, ensuring they will continue to be relevant for years to come.

电信领域多年来取得了显著的进展，其中在这一领域中发挥关键作用的基本组件之一就是天线。在各种类型的天线中，半波天线因其简单性和高效性而脱颖而出。半波天线（半波天线）设计为其传输或接收频率的一半波长。这种设计允许最佳性能，使其成为业余无线电爱好者和专业人士的热门选择。半波天线背后的基本原理是它在其处理的信号频率上共振。当交流电流通过天线时，它会产生一个电磁场，该场通过空间传播。天线的长度至关重要；如果太短或太长，传输和接收的效率可能会显著降低。通常，半波天线的长度约为468除以以兆赫（MHz）为单位的频率。例如，如果您正在使用144 MHz的频率，则天线的理想长度约为3.25英尺。半波天线的一个显著优点是其辐射模式。它通常表现出宽侧辐射模式，这意味着它在天线本身垂直的方向上更有效地辐射能量。这一特性使其在需要特定方向覆盖的应用中尤为有用。此外，半波天线相较于其他类型的天线通常具有相对较高的增益，这意味着信号强度和质量更好。另一个值得注意的方面是构建的简易性。半波天线可以使用简单的材料构建，例如铜线或铝管，使其对喜欢DIY项目的爱好者来说变得可及。这种简单性并没有妨碍性能；许多操作员报告称，在各种设置中使用自制的半波天线获得了出色的效果。然而，像任何技术一样，半波天线也有其局限性。例如，在有显著物理障碍的环境中，例如建筑物或大树，其性能可能不佳。在这些情况下，其他天线设计，例如定向天线，可能更有效。此外，虽然半波天线用途广泛，但主要适用于特定频段，操作员在更改频率时通常需要调整其设置。总之，半波天线是无线通信世界中的一个重要元素。其简单的设计、高效的性能和易于构建的特点使其成为业余爱好者和专业人士的首选。了解如何有效利用半波天线可以大大增强人们在无线通信领域的体验。随着技术的不断发展，支配半波天线等天线的原理仍然是基础，确保它们在未来几年仍将保持相关性。