Microwave band-pass filter having frequency characteristic of insertion loss steeply increasing on one outside of pass-band
US5291161A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Jul 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2039
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a microwave band-pass filter provided with a main line having an input terminal and an output terminal on both ends thereof, first, second, third and fourth open-ended stubs having lengths L1, L2, L3 and L4 connected electrically in parallel to the main line at intervals L0, L0' L0", respectively. The lengths of two of the four open-ended stubs are selected to be substantially equal to a quarter of the wavelength of the first stop-band frequency signal on the band lower than the pass-band, and the lengths of the others thereof are selected to be substantially equal to a quarter of the wavelength of the second stop-band frequency signal on the band higher than the pass-band. In this case, the insertion loss thereof steeply increases on a boundary band from one stop-band to the pass-band. In particular, there can be obtained the microwave band-pass filter having a simpler structure, in which the insertion loss steeply increases on the band higher or lower than the pass-band, and the insertion loss on the band lower or higher than the pass-band is relatively large over a relatively wide band, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.