To use a dielectric substrate, which has a wide band, reduces a power feeding loss and facilitates mass production, as an antenna device for overland mobile communication system.
An antenna device 11 is composed of a dielectric printed circuit board 12 and a power feeding line 3. In this case, concerning the dielectric printed circuit board 12, radiating elements 13 and power feeding microstrip lines 14 are altermately and serially connected and formed almost for every 1/2 wavelength of frequency to be used along lengthwise direction on both the sides of a long rectangular substrate 12a. Then, at the connecting part (power feeding point) of the radiating element 13 and the power feeding microstrip line 14, the power feeding microstrip line 14 is extended at a conductive section 13a on the side of the radiating element 13, and notched parts are formed on both the sides of the line 14. Thus, a power feeding point impedance can be lowered.
ARIMA TAKAFUMI
NOSE HIROYUKI
N T T CHUO PERSONAL TSUSHINMO