| 摘要 |
PROBLEM TO BE SOLVED: To provide an active antenna device having high noise resistance and good storage performance in a terminal. SOLUTION: The active antenna device 101 comprises: a pair of antennas; an active circuit part 103 connected to the antennas; and a coaxial cable 104 connected to output of the active circuit part 103. The active circuit part 103 comprises: balanced amplifier circuits 110, 116; two attenuating circuits 112, 118 connected to two outputs of the amplifying circuits 110, 116, respectively; and a balun circuit 120 connected to outputs of the two attenuating circuits 112, 118. Mismatch loss of the balun circuit 120 and the coaxial cable 104 is reduced by the attenuating circuits 112, 118. COPYRIGHT: (C)2009,JPO&INPIT
|
