US4455540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band pass filter with linear resonators open at both their extremities
Assignee: Thales SA
•
Filing: 1982-07-21
•
Granted: 1984-06-19
•
Expires: 2002-07-21
Abstract
Abstract A band-pass filter comprising n principal linear resonators open at both their extremities, has integrated therewith a band suppressor function by means of p auxiliary linear resonators (p being an integer comprised between 0 and n+1), tuned to a frequency which is to be rejected and respectively connected to p resonators of the n principal resonators at a point situated close to the middle of the principal resonator in question.
Inventors
- 👤 Marie C. Henriot
- 👤 Patrick Janer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:50
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20372
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
A filter having a band pass region whose mean wavelength is λ and a band cut out for eliminating a frequency λ', said filter comprising: n main linear resonators wherein n is a positive integer at least equal to one and wherein each of said main linear resonators having a length equal to λ/2 and having two open extremities and a middle with said middle being at a location on said linear resonator where the electric field has a minimum value; p auxiliary linear resonators wherein p is a positive integer at least equal to one and at most equal to n each having a length equal to one of λ'/2 and λ'/4 and each of said auxiliary linear resonators having two extremities and a middle with at least one of said extremities of said auxiliary resonators being open wherein said p auxiliary resonators are respectively connected to the middle of p of said main linear resonators.
Claim 2
Dependent Claim
157 words
A filter having a band pass region whose mean wavelength is λ and a band cut out for eliminating a frequency λ', said filter comprising: n main linear resonators wherein n is a positive integer at least equal to one and wherein each of said main linear resonators having a length equal to λ/2 and having two open extremities and a middle with said middle being at a location on said linear resonator where the electric field has a minimum value; p auxiliary linear resonators wherein p is a positive integer at least equal to one and at most equal to n each having a length equal to one of λ'/2 and λ'/4 and each of said auxiliary linear resonators having two extremities and a middle with at least one of said extremities of said auxiliary resonators being open wherein said p auxiliary resonators are respectively connected to the middle of p of said main linear resonators.
Claim 3
Dependent Claim
28 words
A filter according to claim 1 wherein each of said main linear resonators is a U resonator formed substantially by two vertical bars and by a horizontal bar.
Claim 4
Dependent Claim
55 words
A filter according to claim 2 wherein each of said p auxiliary linear resonators is a U resonator formed substantially by two vertical bars and by a horizontal bar and in which the horizontal bars of said P auxiliary linear resonators are respectively connected to the horizontal bars of p of said main linear resonator.
Claim 5
Dependent Claim
30 words
A filter according to claim 1, wherein said p auxiliary linear resonators are respectively connected by one of their two extremities to said middle of said p main linear resonators.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |