| 摘要 |
<p>An antenna device for use in a wireless unit of mobile communication comprising antenna elements the pitches of which are hardly irregular and which hardly deform. Excellent in productivity with high gain and high reliability and having two or more impedance characteristics. A method for manufacturing such an antenna is also disclosed. A plurality of stripe parts (16) are connected at their ends to each other alternately and continuously. A plurality of stripe parts (18) are connected at their ends alternately and continuously to a generally circular spiral first antenna element (11) made of thin metal plate and projecting alternately forward and backward. A generally semi-cylindrical second antenna element (12) made of thin metal plate and projecting forward is arranged in a generally concentric position. A fixing metal (13) is connected to one end of the first antenna element (11) and all the members are covered with an insulating resin cover (15). [...]</p> |
