Voltage variable capacitor array and method of manufacture there

Details Voltage variable capacitor array and method of manufacture there Voltage variable capacitor array and method of manufacture there

1998-06-01

2000-07-11

Reichard, Dean A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

361290, 361292, 3612982, 3613014, H01G 501, H01G 506, H01G 4228

Patent

active

06088214&

ABSTRACT:
An array (100) of voltage variable capacitors (110) is provided in which voltage variable capacitors (110) are fabricated with piezoelectric displacement devices (150). Voltage variable capacitors (110) have first plates (120) which are coupled to displacement devices (150). First plates (120) are dielectrically coupled to second plates (130). Displacement device (150) has a stack of metallic layers (154), voltage variable material blocks (152), and voltage supply terminals (170) and (180). Voltage differences are established across voltage variable material blocks (152) using voltage supply terminals (170) and (180). A voltage difference causes a voltage variable material layer to change thickness, and this causes first plate (120) to move relative to second plate (130). Voltage variable material is selected from a group of piezoelectric ceramics, which can include lead-titanate (PbTiO.sub.3), lead-zirconate (PbZrO.sub.3), barium-titanate (BaTiO.sub.3), and lead-zirconate-titanate (PbZr.sub.x Ti.sub.1-x O.sub.3), where x varies from zero to one.

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