نمونه متن انگلیسی مقاله
In recent years, high standards and strict requirements have been put forward on the structure and performance of antennas, especially bandwidth, gain and directivity have become the most important performance indicators of antennas. How to broaden bandwidth has become a hot topic. The left and right hand transmission line structure has the advantages of low loss, frequency bandwidth, small size and easy fabrication, and is more suitable for the design of a wideband antenna. This paper summarizes the application of the left and right hand transmission lines in the broadband antenna unit.
Antennas are one of the essential devices in military and civilian radio systems such as radio, radio, navigation, and radar. A device that transmits and receives electromagnetic signals in a radio system is called an antenna. The antenna mainly performs energy conversion: when transmitting, the energy transmitted by the transmitter through the transmission line is converted into electromagnetic wave to be radiated outward; when receiving, the specific electromagnetic wave in the space is converted into energy capable of propagating in the transmission line, and then transmitted to the receiving line by the transmission line. machine. The antenna can be regarded as a converter between the guided electromagnetic wave and the spatial electromagnetic wave.