Magnetic ferrite microwave resonator frequency adjuster and tunable filter
US6501971B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1996 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Oct 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/218
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A magnetic ferrite microwave resonator frequency tunable filter and method for tuning a filter having both a resonator portion and a tuning portion. The resonator portion has an input for receiving an electromagnetic signal and an output for emitting an electromagnetic signal. A tuning portion includes a magnetic ferrite element disposed in first and second magnetic fields generated by a fixed magnet and an electromagnet. The magnetic ferrite element has a magnetic permeability determined by the first and second magnetic fields. The first magnetic field places a ferromagnetic resonance frequency of the ferrite element near a frequency of the electromagnetic signal transmitted by the resonator portion. The second magnetic field is variable in response to a varying current supplied to the electromagnet to change the permeability of the ferrite element, to thereby alter the center frequency of the resonator, thereby facilitating tuning of the electromagnetic signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.