每个天线有三部份组成。 A: Each antenna has three parts. B: Each antenna comprises three parts. C: Each antenna consists of three parts.

Mobile phone contains a brain, a heart, an antenna, a LCD, a keyboard, a microphone, a speaker and a battery.

Which part of radar can protect receiver? A: trigger generator B: duplexer C: transmitter D: antenna

词汇与结构 Each ILS antenna ____ a narrow beam, one slightly to the left of the runway centerline, the other to the right.

下列英语单词中属于存储意思的是（）。 A: Stands B: Antenna C: Select D: Store

Simulation and experimental studies _____, which show that the axial ratio bandwidth of the antenna is directly proportional to the thickness of the substrate.? have been performed|;is performed;;|was performed;;|were performed;

智慧职教: 天线（Antenna）：是一种以[填空(1)] 形式把无线电收发机的射频信号功率接收或辐射出去的装置，在标签和读取器间传递射频信号。

智慧职教: [填空(1)] 用于接收主机（Host）端的命令，对于储存在感应器的数据则将其以有线或无线方式传送回主机，它内含Controller（控制器）及Antenna（天线），如果读取距离较长，则天线会单独存在。

Which one is not mentioned in the video A: In AM, carrier wave results in the height or amplitude changing. B: Lower frequency signals would require a much larger size of antenna at the receiving end. C: FM is less susceptible to interference and FM also has the advantage of having much higher bandwidth. D: How many turns of the wire will determine what frequency you are picking.

RFID 射频识别是一种非接触式的自动识别技术,它通过射频信号自动识别目标对象并获取相关数据,识别工作无须人工干预,可工作于各种恶劣环境。射频信号的发送与接收是通过RFID 系统中哪部分完成的:( ) A: 标签(Tag) B: 扫描器(Scanner) C: 天线(Antenna) D: 阅读器(Reader)