Patent ID: 7824997
Filing Date: 2010-11-02
Classification: H01P,H03H

Abstract:
1. A method for fabricating a suspended varactor, said method comprising; providing a main substrate; depositing a membrane on the main substrate; depositing and patterning a first sacrificial photoresist layer on the membrane; depositing a first metal seed layer on the patterned first photoresist layer; depositing and patterning a second sacrificial photoresist layer on the first metal seed layer to expose a central portion of the seed layer; depositing a first varactor beam on the central portion of the first metal seed layer within an opening in the second photoresist layer; removing at least a portion of the first photoresist layer, the second photoresist layer and the first metal seed layer; depositing and patterning a third sacrificial photoresist layer over the first varactor beam and the membrane to expose a central portion of the first varactor beam; depositing a second metal seed layer over the third photoresist layer and the exposed portion of the first varactor beam; depositing and patterning a fourth sacrificial photoresist layer over the second metal seed layer to expose a central portion of the second metal seed layer; depositing a second varactor beam on the second metal seed layer so that the second varactor beam has a T-shape that is electrically coupled to the second seed layer and the first varactor beam; coupling a carrier substrate to the fourth photoresist layer and the second varactor beam opposite to the main substrate; depositing and patterning a masking layer on the main substrate; etching a central portion of the main substrate to expose the membrane; removing the carrier substrate; and removing any remaining portion of the first, third and fourth photoresist layers to provide a released varactor.