LTCC BASED ELECTRONICALLY TUNABLE MULTILAYER MICROSTRIP-STRIPLINE COMBLINE FILTER

WIPO Patent Application WO2005010952

A3

A voltage-controlled tunable multilayer filter (100) which comprises a first resonator (183) on a first layer of dielectric material or low-temperature-co fired-ceramic; a second resonator coupled to said first resonator on a second layer of dielectric material or low-temperature-co fired-ceramic; a third resonator located on a third layer of dielectric material or low-temperature-co fired-ceramic coupled to said second resonator and cross coupled to said first resonator; an input transmission line (165) connected to said first resonator; an output transmission line (170) connected with said third resonator; and a variable capacitor in at least one of said resonators. The variable capacitor can comprise a substrate having a low dielectric constant with planar surfaces; a tunable dielectric film on said substrate comprising a low loss tunable dielectric material; a metal electrode with predetermined length, width, and gap distance; and a low loss isolation material used to isolate an outer bias metallic contact and a metallic electrode on the tunable dielectric. This allows the center frequency of the filter to be tuned by changing the variable capacitor capacitance by changing the voltage.

RAHMAN MOHAMMED MAHBUBUR (US)
SHAMSAIFAR KHOSRO (US)
KANG QINGHUA (US)

PCT/US2004/003422

August 04, 2005

February 05, 2004

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PARATEK MICROWAVE INC (US)
RAHMAN MOHAMMED MAHBUBUR (US)
SHAMSAIFAR KHOSRO (US)
KANG QINGHUA (US)

H01P1/203; (IPC1-7): H01P1/203

US6597259B1	2003-07-22
US6492883B2	2002-12-10
US6483404B1	2002-11-19
US6470173B1	2002-10-22
US20020149448A1	2002-10-17
US4701727A	1987-10-20

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