| 摘要 |
PURPOSE:To attain ease of impedance matching and to reduce the effect of electronic components in the inside of a case by short-circuiting one end of a peripheral between two conductor plates clipping a dielectric substance and providing a capacitor at the other end of the conductor plates so as to attain tuning and feeding power from one part between the short-circuited part and the capacitor. CONSTITUTION:The conductor plates 10 and 11 are opposed to each other with an interval (h) while clipping the inserted dielectric substance 12, the short-citcuit part 15 short-circuits electrically at one end of the peripheral part of the conductor plates 10, 11, the capacitor 16 is provided at the opposite position to the short-circuit part 15 and power is supplied from a feeding point 17. A slot antenna is a kind of an exciting antenna, the impedance is tuned by the capacitor 16 and an excellent impedance characteristic is attained by selecting positions S1, S2 of the feeding point so as to match the antenna impedance Za at the feeding point 17 to the impedance of a radio equipment circuit. Further, the inductive component of the antenna is tuned by the capacitor 16 and this antenna is equivalent to the tap-down of the tuning circuit at the feeding position, thereby eliminating the need for the component for impedance matching. |
