| 摘要 |
Directional antenna system for short and ultra short waves of which the elements (1, 2, 3) are tuned without a tuning device such as a series or parallel resonance circuit. The system is tuned by the fact that the imaginery inductive component of a radiation element (1) too long at a certain frequency is coupled by spacial approach with the imaginery capacitive component of a too short radiation element (2), those two components compensating mutually. Hence, the system is adapted to the impedance of the conductor by an additional conductor (10) which further makes accessible other frequency ranges such as for example 7 MHz. |
