| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna for a wireless device which, even when a conductive object exists nearby, can excellently transmit and receive radio waves in all directions around. <P>SOLUTION: A printed circuit board 20 is placed in parallel to a GND plate 10 which is a conductor formed in shape of a plate and has its potential maintained at the GND level. Short-circuit conductors 32, 42 are placed on the printed circuit board 20 in a manner to have electrical continuity therewith, and radiation plates 34, 44 used to radiate radio waves are attached to the tips thereof. Furthermore, inverted F type antenna elements 30, 40 each having a feed point for supplying transmit signals radiated from the radiation plates 34, 44 are disposed generally in parallel to the side face of a conductive object 70 at intervals of half the wavelength of transmitted and received radio waves. Also disposed between the GND plate 10 and the printed circuit board 20 and in the vicinity of each of the two antenna elements 30, 40 are two raising conductor plates 50, 60 used to raise the printed circuit board 20 from the GND plate 10 to a height equal to or greater than one-sixteenth the wavelength of transmitted and received radio waves. <P>COPYRIGHT: (C)2012,JPO&INPIT |
