Bandstop filter having symmetrically altered or compensated quarter wavelength transmission line sections
US5191304A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Feb 27, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/209
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multi-resonator notch filter incorporates a variable impedance transmission line with impedance values going from a relatively low value and increasing upward to a relatively high value then back down to a relatively low value again. A plurality of resonant cavities is coupled to the relatively high central impedance line section of the filter at odd multiples of quarter wavelength intervals. Other resonators can be coupled to lower impedance sections of the transmission line. The locations of selected resonators on the quarter wavelength intervals can be altered thereby increasing and decreasing the nominal quarter wavelength intervals of selected internal pairs by a predetermined amount thereby providing acceptable levels of performance with fewer resonators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.