RF envelope generator
US4864258A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | May 2, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P5/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A microwave rf envelope generator or pulse shaper has a main waveguide with two opposing branches connected in shunt to the main waveguide and are terminated with variable positionable shorts. The characteristic impedance of the shunted combination of the two branches equal one half the characteristic impedance of the main waveguide. An incident rf pulse applied to an input of the main waveguide is transmitted to a four way junction formed at the intersection of the two branches. The incident pulse is divided at the junction. Divided pulses are then transmitted down each of the branches and to an output of the main waveguide. The pulses traveling down each branch will have their phases shifted when they are reflected by the variable positionable shorts. The lengths of the branches are adjusted by the variable shorts so that the phase of the reflected and inverted pulses will cancel the trailing portion of the pulse transmitted out towards the output of the main waveguide. The output pulse width is a function of the time it takes the divided pulses to travel down the branches and back.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.