| 摘要 |
PURPOSE:To easily obtain the wide band characteristics without increasing the number of antenna elements, by providing the first variable reactance circuit to the power feeding side of antenna element and the second variable reactance circuit to the power supply side. CONSTITUTION:The reactive component of the elements 9, 9' is canceled at the first parallel resonance variable reactance circuit connected to the power feeding side of the elements 9, 9' having the distributed constant inductance, and matching and tuning are made in the tuning frequency f2 with the capacitor 13 for impedance adjustment provided between the first power feeding terminals 12, 12' and variable tuning is made in frequencies f1-f2 to be tuned with the variable capacitors 11, 11'. Further, the second parallel resonant reactance circuit is connected to the terminals 12, 12' after being set to different value from the reactance value in the first circuit, and the original impedance curve can be turned on the constant conductance curve. Thus, the impedance curve shows two-peak characteristics and the band width can easily be extended. |
