US4433314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Millimeter wave suspended substrate multiplexer
Assignee: United States Department of the Navy
•
Filing: 1982-01-21
•
Granted: 1984-02-21
•
Expires: 2002-01-21
Abstract
Abstract A millimeter wave suspended substrate multiplexer is disclosed which is comprised of a plurality of hybrid-filter-hybrid channel dropping sections. The components of the multiplexer are enclosed in a metallic housing forming a cavity surrounding the multiplexer components. Each of the hybrid-filter-hybrid sections is comprised of first and second 90° hybrid couplers which are connected by a pair of identical bandpass filters. Spurious waveguide energy propagation modes which would otherwise be generated in the cavity surrounding the 90° suspended hybrid couplers are eliminated by the use of a plurality of mode suppression pins extending between the top and bottom portions of the metallic housing and passing through the branch lines of the couplers.
Inventors
- 👤 Alfred R. Hislop
- 👤 David Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:07
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
227 words
A multiplexer for separating the components of a signal having signal components in N bands of frequencies comprising: a dielectric substrate; first means disposed on said substrate for receiving a signal including signal components within at least one of N bands of frequencies; N suspended substrate channel dropping filters disposed on said dielectric substrate each having an input port, a signal pass output port and a signal reject output port, a first one of said N channel dropping filters having its input port operably coupled to said first means and each of the remaining N-1 channel dropping filters having its input port operably coupled to the signal reject output port of one of the other N-1 channel dropping filters; a metallic housing forming a cavity surrounding said dielectric substrate, said first means and said N channel dropping filters; each of said N channel dropping filters comprising: a first hybrid coupler; a bandpass filter operably coupled to said first hybrid coupler; a second hybrid coupler operably coupled to said bandpass filter; each of said bandpass filters comprising first and second substantially identical edge-coupled filters; said metallic housing having a top portion and a bottom portion; and each pair of said first and second substantially identical edge-coupled filters having a metallic wall positioned between first and second edge-coupled filters and extending between said metallic housing top and bottom portions.
Claim 2
Dependent Claim
227 words
A multiplexer for separating the components of a signal having signal components in N bands of frequencies comprising: a dielectric substrate; first means disposed on said substrate for receiving a signal including signal components within at least one of N bands of frequencies; N suspended substrate channel dropping filters disposed on said dielectric substrate each having an input port, a signal pass output port and a signal reject output port, a first one of said N channel dropping filters having its input port operably coupled to said first means and each of the remaining N-1 channel dropping filters having its input port operably coupled to the signal reject output port of one of the other N-1 channel dropping filters; a metallic housing forming a cavity surrounding said dielectric substrate, said first means and said N channel dropping filters; each of said N channel dropping filters comprising: a first hybrid coupler; a bandpass filter operably coupled to said first hybrid coupler; a second hybrid coupler operably coupled to said bandpass filter; each of said bandpass filters comprising first and second substantially identical edge-coupled filters; said metallic housing having a top portion and a bottom portion; and each pair of said first and second substantially identical edge-coupled filters having a metallic wall positioned between first and second edge-coupled filters and extending between said metallic housing top and bottom portions.
Claim 3
Dependent Claim
14 words
The multiplexer of claim 1 wherein said first means comprises a planar transmission line.
Claim 4
Dependent Claim
18 words
The multiplexer of claims 1 or 2 wherein each of said channel dropping filters has a loaded port.
Claim 5
Dependent Claim
19 words
The multiplexer of claim 1 wherein: each of said first and second hybrid couplers comprises a 90° hybrid coupler.
Claim 6
Dependent Claim
17 words
The multiplexer of claim 4 wherein: each of said second 90° hybrid couplers has a loaded port.
Claim 7
Dependent Claim
30 words
The multiplexer of claim 4 further comprising: a plurality of means for suppressing spurious energy propagation modes, each being positioned in the vicinity of one of said 90° hybrid couplers.
Claim 8
Dependent Claim
48 words
The multiplexer of claim 6 wherein: said metallic housing has a top portion and a bottom portion; and each of said suppressing means comprises at least one metallic pin extending between said top and bottom portions, through said dielectric substrate and through one of said 90° hybrid couplers.
Claim 9
Dependent Claim
46 words
The multiplexer of claim 6 wherein: said metallic housing has a top portion and a bottom portion; and each of said suppressing means comprises three metallic pins extending between said top and bottom portions, through said dielectric substrate and through one of said 90° hybrid couplers.
Claim 10
Dependent Claim
47 words
The multiplexer of claim 4 wherein each of said 90° hybrid couplers comprise: first and second substantially parallel, planar transmission lines disposed on said substrate; and first, second, third and fourth substantially parallel, spaced transmission lines extending between said first and second substantially parallel, planar transmission lines.
Claim 11
Dependent Claim
30 words
The multiplexer of claim 9 further comprising: a plurality of means for suppressing spurious energy propagation modes, each being positioned in the vicinity of one of said 90° hybrid couplers.
Claim 12
Dependent Claim
48 words
The multiplexer of claim 10 wherein: said metallic housing has a top portion and a bottom portion; and each of said suppressing means comprises at least one metallic pin extending between said top and bottom portions, through said dielectric substrate and through one of said 90° hybrid couplers.
Claim 13
Dependent Claim
46 words
The multiplexer of claim 10 wherein: said metallic housing has a top portion and a bottom portion; and each of said suppressing means comprises three metallic pins extending between said top and bottom portions, through said dielectric substrate and through one of said 90° hybrid couplers.
Claim 14
Dependent Claim
34 words
The multiplexer of claim 12 wherein: each of said three metallic pins extends through said substrate in the space between one pair of said first, second, third and fourth substantially parallel, spaced transmission lines.
References Cited (Backward Citations)
US2922123A
Cited
US3135935A
Cited
US3772616A
Cited
US4029902A
Cited
US4159454A
Cited
US4210881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |