Patent US5023579A successfully refreshed from Google Patents.
US5023579A
Expired / Lapsed
US
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Integrated bandpass/lowpass filter
Assignee: Radio Frequency Systems Inc
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Filing: 1990-07-10
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Granted: 1991-06-11
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Expires: 2010-07-10
Abstract
Abstract A bandpass/lowpass filter comprises a bandpass filter with two or more resonators with the first and last resonators coupled to associated connectors. Corresponding lowpass filters are positioned within the first and last resonators, wherein each lowpass filter comprises a plurality of low impedance and high impedance elements. A disk emanates from each of these integrated lowpass filters so as to couple the filtered electromagnetic energy to the bandpass filter. The overall result is an integrated filter having a desired bandpass with significant suppression of spurious frequencies. The overall integrated filter is significantly smaller than conventional filters using external inline lowpass filters.
Inventors
- 👤 Salvatore Bentivenga
- 👤 Michael J. Bentivenga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:39
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/202; H01P1/205
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
123 words
An integrated bandpass/lowpass filter comprising: (A) a bandpass filter having, (1) a cavity, (2) at least one resonator positioned within the cavity, and (3) means for coupling electromagnetic energy into and out of the filter; and (B) at least one integrated lowpass filter, each lowpass filter formed within one resonator of the bandpass filter, each lowpass filter having, (1) at least one low impedance element positioned within the resonator, (2) at least one high impedance element connected to the low impedance element and positioned within the resonator, (3) means for coupling the output of the lowpass filter to the bandpass filter, and (4) means for coupling the lowpass filter to the means for coupling electromagnetic energy into and out of the bandpass filter.
Claim 2
Dependent Claim
123 words
An integrated bandpass/lowpass filter comprising: (A) a bandpass filter having, (1) a cavity, (2) at least one resonator positioned within the cavity, and (3) means for coupling electromagnetic energy into and out of the filter; and (B) at least one integrated lowpass filter, each lowpass filter formed within one resonator of the bandpass filter, each lowpass filter having, (1) at least one low impedance element positioned within the resonator, (2) at least one high impedance element connected to the low impedance element and positioned within the resonator, (3) means for coupling the output of the lowpass filter to the bandpass filter, and (4) means for coupling the lowpass filter to the means for coupling electromagnetic energy into and out of the bandpass filter.
Claim 3
Dependent Claim
80 words
An integrated bandpass/lowpass filter as defined in claim 1, wherein the means for coupling the output of the lowpass filter to the bandpass filter comprises a disk extending beyond the resonator within which the low and high impedance elements of the lowpass filter are housed so as to be within the bandpass filter cavity, and a connecting rod connected at one end to one of the elements forming the lowpass filter and connected at its other end to the disk.
Claim 4
Dependent Claim
39 words
A integrated bandpass/lowpass filter as defined in claim 2, further comprising spacers positioned between the low impedance elements and the interior surface of the associated resonator so as to position the low impedance elements concentrically within the associated resonator.
Claim 5
Dependent Claim
23 words
An integrated bandpass/lowpass filter as defined in claim 3, wherein the low impedance elements of the lowpass filter are fabricated from metallic rod.
Claim 6
Dependent Claim
23 words
An integrated bandpass/lowpass filter as defined in claim 4, wherein the high impedance elements of the lowpass filter are fabricated from copper wire.
Claim 7
Dependent Claim
27 words
An integrated bandpass/lowpass filter as defined in claim 5, wherein the lowpass filter spacers are fabricated from Teflon® sheathing so as to act as a capacitive dielectric.
Claim 8
Dependent Claim
31 words
An integrated bandpass/lowpass filter as defined in claim 6, wherein the bandpass filter further comprises, for each resonator, a tuning screw passing through the cavity and in proximity to the resonator.
Claim 9
Dependent Claim
67 words
An integrated bandpass/lowpass filter as defined in claim 7, wherein the bandpass filter is of a combline design and comprises seven resonators and wherein two lowpass filters are integrally formed within the first and last resonators of the combline filter, and further wherein each lowpass filter comprises three low impedance elements and two high impedance elements, with the high impedance elements interconnecting the three low impedance elements.
Claim 10
Dependent Claim
23 words
An integrated bandpass/lowpass filter as defined in claim 1, wherein the low impedance elements of the lowpass filter are fabricated from metallic rod.
Claim 11
Dependent Claim
23 words
An integrated bandpass/lowpass filter as defined in claim 9, wherein the high impedance elements of the lowpass filter are fabricated from copper wire.
Claim 12
Dependent Claim
23 words
An integrated bandpass/lowpass filter as defined in claim 1, wherein the high impedance elements of the lowpass filter are fabricated from copper wire.
Claim 13
Dependent Claim
40 words
An integrated bandpass/lowpass filter as defined in claim 1, wherein the means for coupling electromagnetic energy into and out of the filter comprises first and second connectors, each connector attached to the cavity so as to connect to one resonator.
Claim 14
Dependent Claim
27 words
A integrated bandpass/lowpass filter as defined in claim 1, further comprising non-conductive sheathing positioned between the low impedance elements and the interior surface of the associated resonator.
Claim 15
Dependent Claim
158 words
An integrated combline bandpass/lowpass filter comprising: (A) a combline bandpass filter having, (1) a cavity, (2) N resonators positioned within the cavity, where N is an integer greater than one, (3) N tuning screws each passing through the cavity and each in proximity to one of the N resonators, and (4) first and second connectors each attached to the cavity and passing therethrough so as to connect each to one resonator; and (B) at least one integrated lowpass filter, each lowpass filter formed within one resonator of the combline bandpass filter, each lowpass filter having, (1) at least one low impedance element positioned within the resonator, (2) at least one high impedance element connected to the low impedance element and positioned within the resonator, (3) means for coupling the output of the lowpass filter to the bandpass filter, and (4) means for coupling the input of the lowpass filter to one of the connectors of the bandpass filter.
Claim 16
Dependent Claim
158 words
An integrated combline bandpass/lowpass filter comprising: (A) a combline bandpass filter having, (1) a cavity, (2) N resonators positioned within the cavity, where N is an integer greater than one, (3) N tuning screws each passing through the cavity and each in proximity to one of the N resonators, and (4) first and second connectors each attached to the cavity and passing therethrough so as to connect each to one resonator; and (B) at least one integrated lowpass filter, each lowpass filter formed within one resonator of the combline bandpass filter, each lowpass filter having, (1) at least one low impedance element positioned within the resonator, (2) at least one high impedance element connected to the low impedance element and positioned within the resonator, (3) means for coupling the output of the lowpass filter to the bandpass filter, and (4) means for coupling the input of the lowpass filter to one of the connectors of the bandpass filter.
Claim 17
Dependent Claim
40 words
A integrated combline bandpass/lowpass filter as defined in claim 14, further comprising spacers positioned between the low impedance elements and the interior surface of the associated resonator so as to position the low impedance elements concentrically within the associated resonator.
Claim 18
Dependent Claim
24 words
An integrated combline bandpass/lowpass filter as defined in claim 15, wherein the low impedance elements of the lowpass filter are fabricated from metallic rod.
Claim 19
Dependent Claim
24 words
An integrated combline bandpass/lowpass filter as defined in claim 16, wherein the high impedance elements of the lowpass filter are fabricated from copper wire.
Claim 20
Dependent Claim
27 words
An integrated combline bandpass/lowpass filter as defined in claim 17, wherein the lowpass filter spacers are fabricated from Teflon® sheathing so as to act as a dielectric.
Claim 21
Dependent Claim
35 words
An integrated combline bandpass/lowpass filter as defined in claim 18, wherein the combline filter comprises seven resonators and wherein two lowpass filters are integrally formed within the first and last resonators of the combline filter.
Claim 22
Dependent Claim
35 words
An integrated combline bandpass/lowpass filter as defined in claim 19, wherein each lowpass filter comprises three low impedance elements and two high impedance elements, with the high impedance elements interconnecting the three low impedance elements.
Claim 23
Dependent Claim
132 words
An integrated combination filter comprising: (A) a resonator based filter having, (1) a cavity, (2) at least one resonator positioned within the cavity, and (3) means for coupling electromagnetic energy into and out of the filter; and (B) at least one integrated coaxial element filter, each coaxial element filter formed within one resonator of the resonator based filter, each coaxial element filter having, (1) at least one low impedance element positioned within the resonator, (2) at least one high impedance element connected to the low impedance element and positioned within the resonator, (3) means for coupling the output of the coaxial element filter to the resonator based filter, and (4) means for coupling the coaxial element filter to the means for coupling electromagnetic energy into and out of the resonator based filter.
Claim 24
Dependent Claim
132 words
An integrated combination filter comprising: (A) a resonator based filter having, (1) a cavity, (2) at least one resonator positioned within the cavity, and (3) means for coupling electromagnetic energy into and out of the filter; and (B) at least one integrated coaxial element filter, each coaxial element filter formed within one resonator of the resonator based filter, each coaxial element filter having, (1) at least one low impedance element positioned within the resonator, (2) at least one high impedance element connected to the low impedance element and positioned within the resonator, (3) means for coupling the output of the coaxial element filter to the resonator based filter, and (4) means for coupling the coaxial element filter to the means for coupling electromagnetic energy into and out of the resonator based filter.
Claim 25
Dependent Claim
85 words
An integrated combination filter as defined in claim 21, wherein the means for coupling the output of the coaxial element filter to the resonator based filter comprises a disk extending beyond the resonator within which the low and high impedance elements of the coaxial element filter are housed so as to be within the resonator based filter cavity, and a connecting rod connected at one end to one of the elements forming the coaxial element filter and connected at its other end to the disk.
Claim 26
Dependent Claim
39 words
A integrated combination filter as defined in claim 22, further comprising spacers positioned between the low impedance elements and the interior surface of the associated resonator so as to position the low impedance elements concentrically within the associated resonator.
Claim 27
Dependent Claim
24 words
An integrated combination filter as defined in claim 23, wherein the low impedance elements of the coaxial element filter are fabricated from metallic rod.
Claim 28
Dependent Claim
24 words
An integrated combination filter as defined in claim 24, wherein the high impedance elements of the coaxial element filter are fabricated from copper wire.
Claim 29
Dependent Claim
28 words
An integrated combination filter as defined in claim 25, wherein the coaxial element filter spacers are fabricated from Teflon® sheathing so as to act as a capacitive dielectric.
Claim 30
Dependent Claim
32 words
An integrated combination filter as defined in claim 26, wherein the resonator based filter further comprises, for each resonator, a tuning screw passing through the cavity and in proximity to the resonator.
Claim 31
Dependent Claim
42 words
An integrated combination filter as defined in claim 27, wherein the resonator based filter is of a combline design and comprises seven resonators and wherein two coaxial element filters are integrally formed within the first and last resonators of the combline filter.
Claim 32
Dependent Claim
24 words
An integrated combination filter as defined in claim 21, wherein the low impedance elements of the coaxial element filter are fabricated from metallic rod.
Claim 33
Dependent Claim
24 words
An integrated combination filter as defined in claim 29, wherein the high impedance elements of the coaxial element filter are fabricated from copper wire.
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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |