Dual mode band rejection filter
US4218666A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1979 |
| Grant date | Aug 19, 1980 |
| Priority date | — |
| Expiry date | Apr 27, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/209
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A dual mode band rejection filter for attenuating electromagnetic energy in a predetermined stop band having at least one resonant cavity with a pair of orthogonally related modes of propagation. The energy is propagated through a waveguide coupled to ports in the cavity. The waveguide has an input section coupled to a first cavity port, an intermediate section coupled between the first and second ports of the cavity and an output section coupled to the second port. The length of the intermediate section provides a predetermined phase shift between the first and second ports. The filter may include another dual mode resonant cavity coupled to the waveguide by additional waveguide sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.