Ferroelectric tunable coaxial filter

Details Ferroelectric tunable coaxial filter Ferroelectric tunable coaxial filter

1995-11-30

1999-05-04

Lee, Benny T.

Superconductor technology: apparatus, material, process

High temperature devices, systems, apparatus, com- ponents,...

High frequency waveguides, resonators, electrical networks,...

505700, 505701, 505866, 333 99005, 333207, H01P 1202, H01B 1202

Patent

active

059003901

ABSTRACT:
A coaxial cavity is loaded with a single crystal ferroelectric rod whose permittivity is dependent on the electric field in which it is immersed. Application of a bias voltage changes the permittivity of the ferroelectric rod of the cavity and thus changing the frequency of the coaxial cavity. A tunable coaxial filter is obtained. By placing the cavity in the main transmission line, a bandpass tunable filter is obtained. By placing the cavity in a branch line, a band reject tunable filter is obtained.

REFERENCES:
patent: 2510022 (1950-05-01), Korman et al.
patent: 2577510 (1951-12-01), Cohn
patent: 5459123 (1995-10-01), Das
patent: 5496796 (1996-03-01), Das

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