Patent ID: 6252474
Filing Date: 2001-06-26
Classification: H01P,H03H

Abstract:
A semiconductor phase shifter, comprisingan input terminal;an output terminal; anda high-pass signal path and a low-pass signal path connected in parallel between said input terminal and said output terminal,said high-pass signal path comprising:a first transmission line connected to said input terminal and having an effective length of (2n.sub.1 +1).multidot..lambda./4(n.sub.1 =0 to n), where .lambda. is a wavelength of a propagating signal and n is a positive integer;a second transmission line connected to said output terminal and having an effective length of (2n.sub.2 +1).multidot..lambda./4(n.sub.2 =0 to n);a first field effect transistor connected between said first and second transmission lines; andat least two third transmission lines each connected to said first field effect transistor and to a ground terminal, each of said at least two third transmission lines serving as a respective inductor,said low-pass signal path comprising:a fourth transmission line connected to said input terminal and having an effective length of (2n.sub.3 +1).multidot..lambda./4(n.sub.3 =0 to n);a fifth transmission line connected to said output terminal and having an effective length of (2n.sub.4 +1).multidot..lambda./4(n.sub.4 =0 to n);anda distributed field effect transistor connected between said fourth and fifth transmission lines.