| 摘要 |
PURPOSE: To reduce a control current for changeover control of an antenna. CONSTITUTION: A diode D1 is interposed between an antenna ANT1 and a transmission filter 2 and a diode D2 is interposed between an antenna ANT2 and a reception filter 3. An anode of the diode D1 connects to a control terminal CONT1 and a cathode connects to ground via aλ/4 phase shift circuit 41 and a diode D3 used to block a transmission signal. Furthermore, an anode of the diode D2 connects to a control terminal C0NT2 and a cathode connects to ground via aλ/4 phase shift circuit 42 and the diode D3 used to block a reception signal. The antenna switching control current is reduced by using an independent control signal to connect the antenna ANT1 and the transmission filter 2 or to connect the antenna ANT2 and the reception filter 3 alternately.
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