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一、引言根据一般的说法,微波是指波长为一米——1毫米(300MHz—300GHz)范围的电磁波。从本世纪的30年代开始,由于微波技术实验研究工作的需要,出现了一些较简单的微波测量仪器。40年代中,雷达的广泛应用,推动了微波测量仪器的发展。这个时期的微波测量仪器都是采用电子管和波导管、谐振腔等立体电路的。50年代中,微波技术已在多路通讯、遥测遥控等方面逐渐推广应用,这时晶体管已开始用于微波测量仪器的低频电路中,出现了
I. Introduction According to the general statement, microwave refers to the wavelength of one meter - 1 mm (300MHz-300GHz) range of electromagnetic waves. Since the 1930s of this century, due to the need of experimental research on microwave technology, some simpler microwave measuring instruments have appeared. In the 1940s, radar was widely used to promote the development of microwave measuring instruments. This period of microwave measuring instruments are used tubes and waveguides, resonators and other three-dimensional circuit. In the 1950s, microwave technology was gradually popularized and applied in multi-channel communication, telemetry and remote control, etc. At this moment, the transistor has been used in the low-frequency circuit of the microwave measuring instrument and appeared