DPDT RF switch and TMA using the same

A Tower Mounted Amplifier (TMA) using a Dual Pole Dual Throw (DPDT) Radio Frequency (RF) switch, the TMA comprising:

• a Band Pass Filter (BPF) for reception signals;
• a Low Noise Amplifier (LNA) for amplifying signals output from the BPF;
• and
• a RF switch for transmission/reception switching,
• wherein the RF switch comprises:
• first to fourth transmission lines for forming first to fourth ports, respectively;
• and
• first to fourth slot line pattern sections in which signal transition with the first to fourth transmission lines is implemented, respectively, wherein the first to fourth slot lines are interconnected,
• wherein the first slot line pattern section comprises:
• a first slot line for transferring signals to a signal transition point of the first transmission line, and a connection point with other slot line pattern sections;
• and
• a first switching device for blocking signal transfer by short-circuiting a gap of a slot line in an installation position according to external switching control signals, the first switching device being installed in a preset position of the first slot line,
• wherein the third slot line pattern section comprises:
• a third slot line for transferring signals to a signal transition point of the third transmission lines, and a connection point with other slot line pattern sections;
• and
• a third switching device for blocking signal transfer by short-circuiting a gap of a slot line in an installation position according to external switching control signals, the third switching device being installed in a preset position of the third slot line,
• wherein the second slot line pattern section comprises:
• a first loop-shaped slot line in which signal transition with the second transmission line is implemented at a first side of the second transmission line a second slot line for transferring signals to a connection point of a second side of the first loop-shaped slot line and the slot line pattern sections;
• and
• a second switching device for blocking signal transfer by short-circuiting a gap of a slot line in an installation position according to the switching control signals, the second switching device being installed in at least one side of a connection portion of the first loop-shaped slot line and the second slot line,
• wherein the fourth slot line pattern section comprises:
• a second loop-shaped slot line in which signal transition with the fourth transmission line is implemented at a first side of the fourth transmission line a fourth slot line for transferring signals to a connection point of a second side of the second loop-shaped slot line and the slot line pattern sections;
• and
• a fourth switching device for blocking signal transfer by short-circuiting a gap of a slot line in an installation position according to the switching control signals, the fourth switching device being installed in at least one side of a connection portion of the second loop-shaped slot line and the fourth slot line,
• wherein the second slot line is connected to the first slot line, the fourth slot line is connected to the third slot line, and the third slot line is connected to the first slot line, so that the first to fourth slot lines are eventually interconnected,
• wherein first to fourth ports of the RF switch are respectively connected to a Base Transceiver Station (BTS)-side, a reception signal output terminal of the LNA, a reception signal input terminal to the BPF, and an antenna.