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随着晶体管、集成电路的出现,电子元器件的进一步小型化,天线就显得越来越大,以致成为无线电设备小型化的主要障碍。为此,许多人就把设计小天线作为努力目标,做了大量工作。但由于天线是一种伸展性的辐射体,其辐射效率直接与天线尺寸大小成比例,尽管人们作出很大努力,其进展仍然是有限的。本文推荐一种能缩短到接近1/3λ的中馈同轴偶极天线,介绍其加载、配谐、扼流及匹馈设计方法,并举出UHF波为这种天线的计算实例。
With the advent of transistors, integrated circuits, and further miniaturization of electronic components, the antenna becomes larger and larger, making it a major obstacle to the miniaturization of radio equipment. To this end, many people put a lot of work on the design of small antennas as their goal. However, since the antenna is a stretchable radiator, its radiation efficiency is directly proportional to the size of the antenna. Despite great efforts, its progress is still limited. In this paper, we propose a feed-in coaxial dipole antenna that can be shortened to nearly 1 / 3λ, and introduce the design method of loading, matching, choke and feedback, and give an example of UHF wave for this antenna.