| 摘要 |
PURPOSE:To obtain a plane antenna to be applied to an antenna for both of transmission and reception even when transmitting and receiving frequency bands are mutually separated by several % or more. CONSTITUTION:A ground conductor 3 and a radial conductor l' are oppositely arranged through a dielectric substance 2. The dielectric substance 2 is the same size as the conductor 3 and the conductor 1' is formed by printing so as to be smaller than the size of the conductor 3. The conductor 1' is formed like a circular ring, its inner peripheral part is divided into four parts and opposite arc parts are set up as a pair. An arc part 6A to be one pair is connected to the conductor 3 and an arc part 6B to be the other pair is made opened state. A feeding point 4 is set up in the vicinity of a straight line passing the center of the conductor 1' and the boundary of the arc parts 6A, 6B. The feeding point 4 is connected to an inner conductor of a feeding port (connector) 5 and the external conductor of the port 5 is connected to the conductor 3. Since the inherent values (x) of #1 and #2 modes are made different and respective modes are resonated by respectively different frequency bands, this antenna can be applied to both transmitting and receiving antennas even when transmitting and receiving frequency bands are mutually separated by several % or more. |
