Antenna switching module having amplification function

An antenna switching module having an amplification function for selectively connecting an antenna terminal to any of a transmission terminal and a reception terminal, comprising:

• an amplification circuit unit constructed such that a first capacitor and first and third coils are connected in series to the transmission terminal, a contact point of the first and third coils is grounded through a second coil and a second capacitor connected in series with each other, a first end of the third coil is connected to a gate of a transistor and is grounded through a first resistor and a third capacitor, a second control signal is applied to a contact point of the first resistor and the third capacitor, fourth and sixth coils and a fifth capacitor are connected in series to a drain of the transistor, a contact point of the fourth and sixth coils is grounded through a fifth coil and a fourth capacitor, and a first control signal is applied to a contact point of the fifth coil and the fourth capacitor;
• a low pass filter unit constructed such that seventh, ninth and eleventh coils are connected in series with each other between the fifth capacitor of the amplification circuit unit and the antenna terminal, a contact point of the seventh and ninth coils is grounded through an eighth coil and a sixth capacitor, and a contact point of the ninth and eleventh coils is grounded through a tenth coil and a seventh capacitor;
• a transmission line for connecting a first end of the seventh coil of the low pass filter unit and the reception terminal with each other, the transmission line having a length of ¼ of a wavelength (λ) of a reception signal;
• and
• a switching diode constructed such that its anode is connected to a first end of the transmission line, its cathode is grounded, and the second control signal is applied to the anode.