| 摘要 |
PROBLEM TO BE SOLVED: To secure a double resonance impedance characteristic and to reduce the height and dimensional length of an antenna system by placing a non-driven element which is short-circuited at its side opposite to the short circuit side at a place near an inverted F antenna, i.e., a driven element and in parallel to the antenna. SOLUTION: A flat conductor plate 1 is prepared with a linear conductor 2 which is placed on and almost parallel to the plate 1 and has the electric length of about 1/4 wavelength of the necessary frequency with its single end (a) short-circuited to the plate 1 and the other end opened respectively, and a linear conductor 3 which is placed almost parallel to the conductor 2 and also on and almost parallel to the plate 1 and has the electric length of about 1/4 wavelength of the necessary frequency with its single end 3a opposite to the conductor 2 short-circuited to the plate 1 and the other end opened respectively. Then the electric power is supplied between the plate 1 and a point 2b that is set between the short-circuited and open ends of one of both conductors 2 and 3. In such a constitution, the double resonance impedance characteristic is secured and the height of an antenna system can be reduced. |
