EP0346672A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Monolithic ceramic filter with bandstop function
Assignee: Motorola Solutions Inc
•
Filing: 1989-05-29
•
Granted: —
•
Expires: 2009-05-29
Abstract
Abstract A ceramic filter (114,118) includes a multiple zero bandstop filter function. The ceramic filter has a dielectric block (210) with top (212) and bottom surfaces and at least two holes (221-227), extending from the top surface toward the bottom surface of the block. The block (210) is selectively covered with a conductive material to provide a transmission line resonator for each of the two holes. The filter also includes an input electrode (214) coupled to the dielectric means at a predetermined distance form one first hole (201), and an output electrode (216) coupled to the dielectric means at a predetermined distance from another hole (207). Finally, conductive plating (240), in the form of a transmission line, is contiguously disposed on the dielectric means adjacent the two holes and coupled thereto to provide a bandstop filter function with a zero represented at each hole.
Inventors
- 👤 David Mark Demuro
- 👤 Darious Agahi-Kesheh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:07
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2136; H01P1/201; H01P1/205; H01P1/2056; H04; H04B; H04B1/00; H04B1/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
168 words
A filter comprising: dielectric means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having a plurality of holes, including a first hole and a second hole adjacent said first hole, extending from the top surface toward the bottom surface thereof and spatially disposed at a predetermined distance from one another said dielectric means selectively covered with a conductive material to provide a transmission line resonator for each of said at least two holes: first electrode means comprised of a conductive material coupled to the dielectric means at a predetermined distance from a first one of said holes in dielectric means; second electrode means comprised of a conductive material coupled to the dielectric means at a predetermined distance from another one of said holes in the dielectric means; and said filter further characterized by: plating line means comprised of a conductive material contiguously disposed on the dielectric means adjacent said first and second holes and coupled thereto to provide a bandstop filter function.
Claim 2
Dependent Claim
168 words
A filter comprising: dielectric means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having a plurality of holes, including a first hole and a second hole adjacent said first hole, extending from the top surface toward the bottom surface thereof and spatially disposed at a predetermined distance from one another said dielectric means selectively covered with a conductive material to provide a transmission line resonator for each of said at least two holes: first electrode means comprised of a conductive material coupled to the dielectric means at a predetermined distance from a first one of said holes in dielectric means; second electrode means comprised of a conductive material coupled to the dielectric means at a predetermined distance from another one of said holes in the dielectric means; and said filter further characterized by: plating line means comprised of a conductive material contiguously disposed on the dielectric means adjacent said first and second holes and coupled thereto to provide a bandstop filter function.
Claim 3
Dependent Claim
17 words
A filter according to claim 1 wherein said other one of said holes is said second hole.
Claim 4
Dependent Claim
61 words
A filter according to claim 1 wherein said dielectric means has at least three holes extending from the top surface toward the bottom surface thereof, including: a third hole spatially disposed at a predetermined distance from the second hole; said conductive material selectively covering said dielectric means to provide a transmission line resonator for each of said at least three holes.
Claim 5
Dependent Claim
18 words
A filter according to claim 3 wherein said third hole provides a bandpass filter function within the filter.
Claim 6
Dependent Claim
25 words
A filter, according to any one of the preceding claims characterized in that said first and second holes include a surface covered with conductive plating.
Claim 7
Dependent Claim
27 words
A filter, according to any one of the preceding claims characterized in that said dielectric means includes portions of conductive plating surrounding said first and second holes.
Claim 8
Dependent Claim
28 words
A filter, according to any one of the preceding claims characterized in that said plating line means is disposed a predetermined distance from said portions of conductive plating.
Claim 9
Dependent Claim
30 words
A filter, according to any one of the preceding claims characterized in that at least one of said first and second electrode means is part of said plating line means.
Claim 10
Dependent Claim
24 words
A filter, according to any one of the preceding claims characterized in that said plating line means includes at least one impedance inverter means.
Claim 11
Dependent Claim
25 words
A filter, according to any one of the preceding claims characterized in that said plating line means includes at least one quarter wavelength transmission line.
Claim 12
Dependent Claim
21 words
A filter, according to claim 10, characterized in that said quarter wave length transmission line includes a non-lineal conductive plating segment.
Claim 13
Dependent Claim
51 words
An RF transceiver comprising: a transmitter; a receiver; an antenna; first filter means coupled between said transmitter and said antenna; second filter means coupled between said receiver and said antenna; at least one of said first and second filter means being constructed in accordance with any one of the preceding claims.
Claim 14
Dependent Claim
75 words
A duplexer for coupling a transceiver to an antenna, comprising: first filter means, having an input stage coupled to the antenna and an output stage coupled to the transceiver, for selecting signals applied thereto; said first filter means being constructed in accordance with any one of claims 1 to 11; and second filter means, having an input stage coupled to the transceiver and an output stage coupled to the antenna, for selecting signals applied thereto.
Claim 15
Dependent Claim
74 words
A duplexer for coupling a transceiver to antenna, comprising: first filter means, having an input stage coupled to the antenna and an output stage coupled to the transceiver, for selecting signals applied thereto; and second filter means, having an input stage coupled to the transceiver and an output stage coupled to the antenna, for selecting signal applied thereto; said second filter means being constructed in accordance with any one of claims 1 to 11.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.