US4675630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triple mode dielectric loaded bandpass filter
Assignee: Honeywell Ltd Canada
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Filing: 1985-12-03
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Granted: 1987-06-23
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Expires: 2005-12-03
Abstract
Abstract A triple mode dielectric loaded bandpass filter has at least one cavity resonating in three independent orthogonal modes. A triple mode cavity can be mounted adjacent to either single, dual or triple mode cavities. Inter-cavity coupling is achieved through the iris having two separate apertures that together form a T-shape. The cavities can be planar mounted. The filter is designed for use in the satellite communication industry and results in substantial savings in weight and size when compared to previous filters.
Inventors
- 👤 Wai-Cheung Tang
- 👤 David Siu
- 👤 Bruce C. Beggs
- 👤 Joseph Sferrazza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:20
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208; H01P1/2084; H01P1/2086
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A triple mode function bandpass filter comprising at least one waveguide cavity resonating in three independent orthogonal modes, one of said modes being different from the other two modes, said filter having an input and output for transferring electromagnetic energy into and out of said filter, each cavity having a longitudinal axis that is parallel to a side wall of said cavity, each triple mode cavity having three coupling screws and three tuning screws mounted therein, said coupling screws coupling energy from one mode to another and each of said tuning screws controlling the resonant frequency of a different mode, each triple mode cavity having a dielectric resonator mounted coaxially with the longitudinal axis of that cavity.
Claim 2
Dependent Claim
117 words
A triple mode function bandpass filter comprising at least one waveguide cavity resonating in three independent orthogonal modes, one of said modes being different from the other two modes, said filter having an input and output for transferring electromagnetic energy into and out of said filter, each cavity having a longitudinal axis that is parallel to a side wall of said cavity, each triple mode cavity having three coupling screws and three tuning screws mounted therein, said coupling screws coupling energy from one mode to another and each of said tuning screws controlling the resonant frequency of a different mode, each triple mode cavity having a dielectric resonator mounted coaxially with the longitudinal axis of that cavity.
Claim 3
Dependent Claim
22 words
A bandpass filter as claimed in claim 1 wherein the filter is a planar filter and the dielectric resonator is planar mounted.
Claim 4
Dependent Claim
29 words
A bandpass filter as claimed in claim 2 wherein the filter operates in two HE 11 (N+1) modes and a TM 01N mode, where N is a positive integer.
Claim 5
Dependent Claim
27 words
A bandpass filter as claimed in any one of claims 1, 2 or 3 wherein the dielectric resonator is mounted on a low-loss, low dielectric constant support.
Claim 6
Dependent Claim
48 words
A bandpass filter as claimed in claim 2 wherein there are at least two cavities and an inter-cavity coupling iris being located between adjacent cavities, said iris having appropriate apertures positioned to couple energy between adjacent cavities, each of said . cavities having a dielectric resonator mounted therein.
Claim 7
Dependent Claim
21 words
A bandpass filter as claimed in claim 5 wherein there are at least two triple mode cavities adjacent to one another.
Claim 8
Dependent Claim
23 words
A bandpass filter as claimed in claim 5 wherein there is at least one single mode cavity adjacent to said triple mode cavity.
Claim 9
Dependent Claim
23 words
A bandpass filter as claimed in claim 5 wherein there is at least one dual mode cavity adjacent to said triple mode cavity.
Claim 10
Dependent Claim
51 words
A bandpass filter as claimed in any one of claims 6, 7 or 8 wherein the iris has two apertures, said apertures being normal to one another, each aperture being symmetrical about one centre of line of said iris, said centre line being parallel to an axis of said dielectric resonator.
Claim 11
Dependent Claim
48 words
A bandpass filter as claimed in any one of claims 6, 7 or 8 wherein the iris has two apertures spaced apart from one another, each aperture being symmetrical about one centre line of said iris, said centre line being parallel to an axis of said dielectric resonator.
Claim 12
Dependent Claim
24 words
A bandpass filter as claimed in any one of claims 1, 2 or 5 wherein input and output coupling is achieved via coaxial probes.
Claim 13
Dependent Claim
37 words
A bandpass filter as claimed in any one of claims 1, 2 or 5 wherein input and output coupling is achieved with a ridge waveguide structure operating in a TE 01 mode in an under cut-off condition.
Claim 14
Dependent Claim
46 words
A bandpass filter as claimed in claim 1 wherein there are at least two cavities and an inter-cavity coupling iris located between adjacent cavities, said iris having appropriate apertures positioned to couple energy between adjacent cavities, each of said cavities having a dielectric resonator mounted therein.
Claim 15
Dependent Claim
21 words
A bandpass filter as claimed in claim 13 wherein there are at least two triple mode cavities adjacent to one another.
Claim 16
Dependent Claim
23 words
A bandpass filter as claimed in claim 13 wherein there is at least one single mode cavity adjacent to said triple mode cavity.
Claim 17
Dependent Claim
23 words
A bandpass filter as claimed in claim 13 wherein there is at least one dual mode cavity adjacent to said triple mode cavity.
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) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |