| 摘要 |
PURPOSE: To cope with a diversity reception antenna with one reception filter, to use the reception filter in common, to perform miniaturization and to reduce the cost. CONSTITUTION: Between a transmission side terminal and a reception side terminal, the serial circuit of a forward direction PIN diode D1, aλ/4 phase circuitϕ1 and theλ/4 phase circuitϕ2 and the serial circuit of an inductor L1 and the forward direction PIN diode D3 are parallelly connected. An antenna ANT1 is connected to the connection point of the cathode of the PIN diode D1 and theλ/4 phase circuitϕ1, the antenna ANT2 is connected between the inductor L1 and the anode of the PIN diode D3 and one end of the inductor L2 is connected to the transmission side terminal. The other end of the inductor L2 is connected to a control terminal, the anode of the PIN diode D2 is connected to the connection point of theλ/4 phase circuitθ1 and theλ/4 phase circuitϕ2 and the cathode of the PIN diode D2 is grounded.
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