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J-pole antenna
The J-pole antenna, also called the Zepp' antenna (short for Zeppelin), and more properly known as the J antenna, was first invented by the Germans for use in their lighter-than-air balloons. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. This concept evolved to the J configuration by 1936 attaining the name ''J Antenna'' by 1943.〔
==Characteristics==
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a quarter wave parallel transmission line stub.〔 Matching to the feed-line is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained.〔 Being a half-wave antenna, it provides a small gain over a quarter-wave ground-plane antenna.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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