| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce insertion losses in AM and FM bands and produce a satisfactory VSWR in the FM band. <P>SOLUTION: A series resonance circuit of a coil L1 and a capacitor C1 resonant in the FM band is connected to a terminal 1 of an impedance conversion transformer T. The terminal 1 is thus ungrounded in the AM band. Signals of the AM band pass through the impedance conversion transformer T to be output from a terminal 3 and are output from a port PT2 via a capacitor C3. The terminal 1 is grounded in the FM band. Signals of the FM band are consequently impedance-converted through the impedance conversion transformer T to be output from the terminal 3 and are output from the port PT2 via the capacitor C3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
