US4547901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave receiving apparatus using a waveguide filter
Assignee: Toshiba Corp
•
Filing: 1983-11-17
•
Granted: 1985-10-15
•
Expires: 2003-11-17
Abstract
Abstract In a microwave receiving apparatus using a waveguide filter, the waveguide filter is disposed in parallel to a microwave reception circuit board mounted in a shield container.
Inventors
- 👤 Toshio Shibata
- 👤 Koichiro Sakuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:41
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D9/0641; H03D7/00; H03D7/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
A microwave signal receiving apparatus comprising: a wave guide filter for receiving a microwave signal by an input section and suppressing an image frequency signal component in the microwave signal, said wave guide filter having such a dimension that its cut-off frequency is higher than an image frequency and lower than a desired microwave signal frequency; a receiving circuit board on which a receiving circuit for amplifying an output signal of said wave guide filter and then converting it to an intermediate frequency signal is arranged; and a shield case for housing said wave guide filter and said receiving circuit board, said shield case being sealed at both ends thereof except said input section of said wave guide filter, said wave guide filter and said receiving circuit board being positioned one on top of the other in said shield case in a direction perpendicular to the ends of said shield case.
Claim 2
Dependent Claim
151 words
A microwave signal receiving apparatus comprising: a wave guide filter for receiving a microwave signal by an input section and suppressing an image frequency signal component in the microwave signal, said wave guide filter having such a dimension that its cut-off frequency is higher than an image frequency and lower than a desired microwave signal frequency; a receiving circuit board on which a receiving circuit for amplifying an output signal of said wave guide filter and then converting it to an intermediate frequency signal is arranged; and a shield case for housing said wave guide filter and said receiving circuit board, said shield case being sealed at both ends thereof except said input section of said wave guide filter, said wave guide filter and said receiving circuit board being positioned one on top of the other in said shield case in a direction perpendicular to the ends of said shield case.
Claim 3
Dependent Claim
38 words
The apparatus according to claim 1, wherein said receiving circuit board is formed to have a ground plane and disposed on said wave guide filter such that said ground plane is in contact with said wave guide filter.
Claim 4
Dependent Claim
25 words
The apparatus according to claim 1, wherein said wave guide filter and said receiving circuit board are coupled by a wave guide-microstrip transmission mode converter.
Claim 5
Dependent Claim
18 words
The apparatus according to claim 1, wherein said wave guide filter is formed integrally with said shield case.
References Cited (Backward Citations)
US2901709A
Cited
US2976499A
Cited
US3721921A
Cited
US3859600A
Cited
US4072902A
Cited
US4280113A
Cited
US4276655A
Cited
US4353132A
Cited
EP0059927A1
Cited
JPS5827401A
Cited
EP0094047A1
Cited
US4418429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |