US 7,548,142 B2
Tuneable resonator
Spartak Gevorgyan, Gothenburg (Sweden); Per Thomas Lewin, Onsala (Sweden); Harald Jacobsson, Vastra Frolunda (Sweden); and Andrei Vorobiev, Gothenburg (Sweden)
Assigned to Telefonaktiebolagert L M Ericsson (Publ), Stockholm (Sweden)
Appl. No. 11/573,312
PCT Filed Jul. 06, 2004, PCT No. PCT/SE2004/001099
§ 371(c)(1), (2), (4) Date Feb. 06, 2007,
PCT Pub. No. WO2006/004470, PCT Pub. Date Jan. 12, 2006.
Prior Publication US 2008/0055023 A1, Mar. 06, 2008
Int. Cl. H03B 5/32 (2006.01); H03H 3/02 (2006.01); H03H 9/17 (2006.01)
U.S. Cl. 333—235  [333/188; 333/191; 310/358] 6 Claims
OG exemplary drawing
 
1. A tuneable resonator, comprising:
a substrate layer, said substrate layer supporting a structure with a first electrode, in connection to which first electrode there is arranged a layer of a material which can be brought to resonate, said resonator further comprising a second electrode arranged in connection to said material which can be brought to resonate, wherein said material which can be brought to resonate is a crystalline ferroelectric material in non-polar (paraelectric) phase;
wherein said ferroelectric material is brought into resonance by applying a DC-field between the first and the second electrode in order to induce piezoelectric effect in the resonant material, and by applying an AC-field between the same electrodes in order to generate acoustic waves in said material.