passive antenna

简明释义

无源天线

英英释义

例句

1.The range of a passive antenna 无源天线 is often limited compared to active antennas.

与有源天线相比，passive antenna 无源天线的范围通常有限。

2.The technician installed a passive antenna 无源天线 on the roof to improve the signal strength.

技术员在屋顶上安装了一个passive antenna 无源天线以增强信号强度。

3.For this project, we decided to use a passive antenna 无源天线 because it is more cost-effective.

对于这个项目，我们决定使用passive antenna 无源天线，因为它更具成本效益。

4.We chose a high-gain passive antenna 无源天线 for better reception in remote areas.

我们选择了一根高增益的passive antenna 无源天线以便在偏远地区获得更好的接收效果。

5.A passive antenna 无源天线 does not require an external power source to operate.

一根passive antenna 无源天线不需要外部电源来工作。

作文

In the world of telecommunications, antennas play a crucial role in facilitating communication between devices. One type of antenna that is often discussed is the passive antenna. A passive antenna is defined as an antenna that does not have any active components to amplify the received signals. Instead, it relies solely on its design and physical characteristics to capture and transmit radio waves. This makes passive antennas relatively simple and cost-effective compared to their active counterparts, which include amplifiers and other electronic components. The simplicity of passive antennas allows them to be used in a variety of applications. For example, they are commonly found in television broadcasts, where they receive signals from nearby transmission towers. When properly positioned, a passive antenna can effectively capture these signals, allowing viewers to enjoy high-quality reception without the need for complex equipment. Another area where passive antennas are utilized is in wireless communication systems. In scenarios where power consumption is a concern, such as in remote sensor networks or IoT devices, passive antennas provide an efficient solution. They can operate without the need for a power source, making them ideal for devices that rely on battery power or energy harvesting techniques. Despite their advantages, passive antennas also have limitations. One significant drawback is their inability to boost weak signals. In situations where the signal strength is low, users may find that a passive antenna does not provide adequate performance. This is where active antennas, which incorporate amplifying technology, become essential. Active antennas can overcome signal loss and improve reception quality, but they come at a higher cost and complexity. The design of a passive antenna is critical to its performance. Factors such as size, shape, and material can significantly influence how well the antenna operates. For instance, a dipole antenna is a common type of passive antenna that consists of two conductive elements. Its straightforward design allows it to efficiently radiate and receive electromagnetic waves. Similarly, Yagi-Uda antennas, which feature multiple elements arranged in a specific configuration, can achieve greater directionality and gain, making them popular for both amateur radio and television reception. In conclusion, passive antennas are fundamental components in various communication systems. Their ability to operate without active components makes them a practical choice for many applications. However, it is essential to understand their limitations, especially in terms of signal amplification. As technology continues to evolve, the role of passive antennas will remain significant, serving as reliable tools for capturing and transmitting information across different platforms. Whether in television broadcasting, wireless communication, or remote sensing, passive antennas will continue to be a vital part of our connected world.

在电信领域，天线在促进设备间的通信中扮演着至关重要的角色。其中一个经常被讨论的天线类型是无源天线。无源天线被定义为没有任何主动组件来放大接收信号的天线。相反，它仅依靠其设计和物理特性来捕捉和传输无线电波。这使得无源天线相对简单且成本效益高，相较于其主动对应物，包括放大器和其他电子组件。无源天线的简单性使其可以用于多种应用。例如，它们通常出现在电视广播中，接收来自附近发射塔的信号。当正确定位时，无源天线可以有效捕捉这些信号，使观众无需复杂设备即可享受高质量的接收。另一个使用无源天线的领域是无线通信系统。在电力消耗成为关注点的场景中，例如在远程传感器网络或物联网设备中，无源天线提供了高效的解决方案。它们可以在没有电源的情况下运行，使其非常适合依赖电池供电或能量收集技术的设备。尽管有其优势，无源天线也存在局限性。一个显著的缺点是它们无法增强微弱信号。在信号强度低的情况下，用户可能会发现无源天线无法提供足够的性能。这就是主动天线变得必不可少的地方，主动天线结合了放大技术，可以克服信号损失并改善接收质量，但它们的成本和复杂性更高。无源天线的设计对其性能至关重要。尺寸、形状和材料等因素都可以显著影响天线的操作效果。例如，偶极天线是一种常见的无源天线，由两个导电元件组成。其简单的设计使其能够有效辐射和接收电磁波。同样，Yagi-Uda天线，它具有多个以特定配置排列的元件，可以实现更大的方向性和增益，因此在业余无线电和电视接收中广受欢迎。总之，无源天线是各种通信系统中的基本组件。它们能够在没有主动组件的情况下运行，使其成为许多应用的实用选择。然而，了解它们的局限性，特别是在信号放大方面，是至关重要的。随着技术的不断发展，无源天线的作用将仍然重要，作为在不同平台上捕捉和传输信息的可靠工具。无论是在电视广播、无线通信还是远程传感中，无源天线将继续成为我们互联世界的重要组成部分。