Patent ID: 7659794

Claim:
A single-pole-double-throw switch integrated with a bandpass filtering function for passing radio frequency (RF) signals, the single-pole-double-throw switch comprising: a first transmission line; a second transmission line with a first end being coupled to a second end of the first transmission line; a third transmission line with a first end being coupled to a second end of the second transmission line; a fourth transmission line with a first end being coupled to a second end of the third transmission line; a first resonator with a first end being coupled to a first end of the first transmission line and an opposing second end being grounded; a first transistor having a drain being coupled to the first end of the first transmission line, a source being grounded, and a gate for receiving a first selection signal; a second resonator with a first end being coupled to the second end of the first transmission line and an opposing second end being grounded; a second transistor having a drain being coupled to the second end of the first transmission line, a source being grounded, and a gate for receiving the first selection signal; a third resonator with a first end being coupled to the first end of the fourth transmission line and an opposing second end being grounded; a third transistor having a drain being coupled to the first end of the fourth transmission line, a source being grounded, and a gate for receiving a second selection signal; a fourth resonator with a first end being coupled to a second end of the fourth transmission line and an opposing second end being grounded; a fourth transistor having a drain being coupled to the second end of the fourth transmission line, a source being grounded, and a gate for receiving the second selection signal; and a fifth resonator with a first end being coupled to the second end of the second transmission line and an opposing second end being grounded, wherein the first transmission line, the second transmission line, the third transmission line and the fourth transmission line are of length equal to a quarter of a wavelength of the RF signals.