Double superheterodyne tuner
US4353132A · kind A · utility
38Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1981 |
| Grant date | Oct 5, 1982 |
| Priority date | — |
| Expiry date | Jan 21, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P3/081
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A double superheterodyne tuner including a first and a second frequency converter and a bandpass filter, constituted of microstrip lines, wherein the substrate in which the bandpass filter is built is disposed back to back with the substrates in which the first and second frequency converters are constructed, with the substrate for the bandpass filter extending over the first and second frequency converters, so that a sufficient high-frequency isolation of circuit elements can be effected by the use of smaller shielding plates, the overall size can be reduced and a uniform grounded condition can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.