High-frequency low-pass filter with embedded electrode structure

Claim 2

A miniature pi low-pass filter having more than a 15 db. insertion loss at a frequency of 1 megahertz comprising: a. a central conductor; b. a ferromagnetic inductor in contact with and surrounding said central conductor; c. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of ceramic material of a given thickness and the two capacitor sections therein, said capacitor sections having at least one common external electrode for both sections and at least one electrode embedded in each section within said ceramic tube, said embedded electrodes being insulated from each other and from said common electrode whereby the spacing of said embedded electrodes from said common electrode determine the capacitance and the thickness of said ceramic tube is determined primarily by strength considerations; d. said embedded electrodes being connected to separate points on said central conductor, said connection point being on opposite sides of said inductor and forming two terminals for connection; and e. said common electrode constituting a third terminal.

Claim 3

The pi filter as described in claim 1 in which said inductor is a metallic wound tape, the winding being insulated and bound together by an electrically insulating binder and said inductor having one turn.

Claim 4

The pi filter as described in claim 1 in which said ferromagnetic inductor comprises at least one of the group consisting of iron, nickel, cobalt and an alloy of at least one of the aforementioned metals.

Claim 5

The pi filter of claim 3 wherein said alloy is one of the group consisting of iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-nickel-molybdenum, iron-nickel-chromium, iron-silicon, iron-aluminum and iron-silicon-aluminum.

Claim 6

A miniature pi low-pass filter having more than a 25 db. insertion loss at a frequency of 1 megahertz comprising: a. an inductor having a magnetic core and a plurality of turns of a throughgoing wire wound around said magnetic core to provide increased filter attenuation performance; b. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of ceramic material of a given thickness and two capacitor sections having at least one common external electrode for both sections and at least one electrode embedded in each section within said ceramic tube, said embedded electrodes being insulated from each other and from said common electrode whereby the spacing of said embedded electrodes from said common electrode determine the capacitance and the thickness of said ceramic tube is determined primarily by strength considerations; c. the ends of said wire forming two terminals for connection; and d. said common electrode constituting a third terminal.

Claim 7

A miniature pi low-pass filter having more than a 25 db. insertion loss at a frequency of 1 megahertz comprising: a. an inductor having a magnetic core and a plurality of turns of a throughgoing wire wound around said magnetic core to provide increased filter attenuation performance; b. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of ceramic material of a given thickness and two capacitor sections having at least one common external electrode for both sections and at least one electrode embedded in each section within said ceramic tube, said embedded electrodes being insulated from each other and from said common electrode whereby the spacing of said embedded electrodes from said common electrode determine the capacitance and the thickness of said ceramic tube is determined primarily by strength considerations; c. the ends of said wire forming two terminals for connection; and d. said common electrode constituting a third terminal.

Claim 8

The pi filter described in claim 5 in which said inductor is a ferrimagnetic material having a plurality of turns of a throughgoing wire wound around said magnetic core.

Claim 9

The pi filter as described in claim 5 in which said inductor is a ferromagnetic material having a plurality of turns of a throughgoing wire wound around said magnetic core.

Claim 10

The pi filter as described in claim 7 in which said ferromagnetic inductor comprises at least one of the group consisting of iron, nickel, cobalt and an alloy of at least one of the aforementioned metals.

Claim 11

The pi filter of claim 8 wherein said alLoy is one of the group consisting of iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-nickel-molybdenum, iron-nickel-chromium, iron-silicon, iron-aluminum and iron-silicon-aluminum.

Claim 12

The pi filter as described in claim 1 in which said inductor is a tape wound core and the windings of the throughgoing wire are parallel to the axis of the core.

Claim 13

A miniature pi low-pass filter having more than a 25 db. insertion loss at a frequency of 1 megahertz comprising: a. a central conductor; b. a magnetic core inductor in contact with and surrounding said central conductor; c. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of insulating material of a given thickness and two capacitor sections therein; said capacitor sections each containing a plurality of embedded electrode layers, alternate ones of said embedded electrode layers from each capacitor section being connected together by a conductive inner joint to form a system of connected common electrodes, the remaining embedded electrodes of each section being extended to the outer ends of the insulating tube and connected at their outer ends by a side conductive layer to form a system of two separate parallelly connected electrodes which are connected to the central conductor at separate points and on opposing sides of said inductor to form two terminals; and d. said system of common electrodes being connected at the outer surface of said insulating material to form a third terminal.

Claim 14

A miniature pi low-pass filter having more than a 25 db. insertion loss at a frequency of 1 megahertz comprising: a. a central conductor; b. a magnetic core inductor in contact with and surrounding said central conductor; c. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of insulating material of a given thickness and two capacitor sections therein; said capacitor sections each containing a plurality of embedded electrode layers, alternate ones of said embedded electrode layers from each capacitor section being connected together by a conductive inner joint to form a system of connected common electrodes, the remaining embedded electrodes of each section being extended to the outer ends of the insulating tube and connected at their outer ends by a side conductive layer to form a system of two separate parallelly connected electrodes which are connected to the central conductor at separate points and on opposing sides of said inductor to form two terminals; and d. said system of common electrodes being connected at the outer surface of said insulating material to form a third terminal.

Claim 15

The pi filter described in claim 11 in which said insulating material is a ceramic.

Claim 16

The pi filter as described in claim 12 in which said inductor is a ferrimagnetic material having one turn.

Claim 17

The pi filter described in claim 12 in which said two capacitor sections are formed by joining two individual multilayer capacitor sections by soldering so that a common conductive inner joint is formed for connecting the common electrodes of both sections and the remaining electrodes in each section are separately connected at each of the outer edges thereof by a conductive layer.

Claim 18

The pi filter described in claim 12 in which said two capacitor sections are formed on a single solid ceramic tube and the plurality of electrodes and subsequent insulating layers between said electrodes are formed on said single ceramic tube, said common electrodes being connected by a conductive layer deposited during the formation of said electrodes and during the formation of subsequent insulating layers by screening or masking.

Claim 19

The pi filter as described in claim 12 in which said inductor is a ferromagnetic material having one turn.

Claim 20

The pi filter as described in claim 11 in which two inner electrodes are positioned on the internal surface of said insulating material so that they are insulated from each other and each inner electrode is connected to a side conductive layer and the embedded electrodes which extend to the outer ends of the insulating tube.

Claim 21

The pi filter as described in claim 11 in which an external electrode is positioned on the outer surface of said insulating tube which external electrode is joined to the common conductive inner connection and to the commonly connected electrodes of both capacitor sections.

Claim 22

The pi filter as described in claim 18 in which said ferromagnetic inductor comprises at least one of the group consisting of iron, nickel, cobalt and an alloy of at least one of the aforementioned metals.

Claim 23

The pi filter of claim 19 wherein said alloy is one of the group consisting of iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-nickel-molybdenum, iron-nickel-chromium, iron-silicon, iron-aluminum and iron-silicon-aluminum.

Claim 24

The pi filter as described in claim 18 in which said inductor is a metallic wound tape, the winding being insulated and bound together by an electrically insulated binder and said inductor having one turn.

Claim 25

A miniature pi low-pass filter having more than a 45 db. insertion loss at a frequency of 1 megahertz comprising: a. an inductor having a magnetic core and a plurality of turns of a throughgoing wire wound around said magnetic core to provide increased filter attenuation performance; b. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of insulating material of a given thickness and two capacitor sections therein; said capacitor sections each containing a plurality of embedded electrode layers, alternate ones of said embedded electrode layers from each capacitor section being connected together by a conductive inner joint to form a system of connected common electrodes, the remaining embedded electrodes of each section being extended to the outer ends of the insulating tube and connected at their outer ends by a side conductive layer to form a system of two separate parallelly connected electrodes which are connected to the ends of said throughgoing wire to form two terminals; and c. said system of common electrodes being connected at the outer surface of said insulating material to form a third terminal.

Claim 26

A miniature pi low-pass filter having more than a 45 db. insertion loss at a frequency of 1 megahertz comprising: a. an inductor having a magnetic core and a plurality of turns of a throughgoing wire wound around said magnetic core to provide increased filter attenuation performance; b. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of insulating material of a given thickness and two capacitor sections therein; said capacitor sections each containing a plurality of embedded electrode layers, alternate ones of said embedded electrode layers from each capacitor section being connected together by a conductive inner joint to form a system of connected common electrodes, the remaining embedded electrodes of each section being extended to the outer ends of the insulating tube and connected at their outer ends by a side conductive layer to form a system of two separate parallelly connected electrodes which are connected to the ends of said throughgoing wire to form two terminals; and c. said system of common electrodes being connected at the outer surface of said insulating material to form a third terminal.

Claim 27

The pi filter described in claim 22 in which said insulating material is a ceramic.

Claim 28

The pi filter described in claim 23 in which said inductor is a ferrimagnetic material having a plurality of turns of a throughgoing wire wound around said magnetic core.

Claim 29

The pi filter as described in claim 23 in which said inductor is a ferromagnetic material having a plurality of turns of a throughgoing wire wound around said magnetic core.

Claim 30

The pi filter as described in claim 25 in which said inductor is a tape wound core and the windings of the throughgoing wire are parallel to the axis of the core.

Claim 31

The pi filter as described in claim 25 in which said ferromagnetic inductor comprises at least one of the group consisting of iron, nickel, cobalt and an alloy of at least one of the aforementioned metals.

Claim 32

The pi filter as described in claim 27 wherein said alloy is one of the group consisting of iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-nickel-molybdenum, iron-nickel-chromium, iron-silicon, iron-aluminum and iron-silicon-aluminum.

Claim 33

A miniature pi low-pass filter having more than a 15 db. insertion loss at a frequency of 1 megahertz comprising: a. a central conductor; b. a magnetic core inductor in contact with and surrounding said central conductor; c. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of ceramic material of a given thickness and two capacitor sections therein, said capacitor sections having at least one common external electrode for both sections and at least one electrode embedded in each section within said ceramic tube, said embedded electrodes being insulated from each other and from said common electrode whereby the spacing of said embedded electrodes from said common electrode determine the capacitance and the thickness of said ceramic tube is determined primarily by strength considerations; d. said embedded electrodes being connected to separate points on said central conductor, said connection point being on opposite sides of said inductor and forming two terminals for connection; and e. said common electrode constituting a third terminal.

Claim 34

A miniature pi low-pass filter having more than a 15 db. insertion loss at a frequency of 1 megahertz comprising: a. a central conductor; b. a magnetic core inductor in contact with and surrounding said central conductor; c. a solid body capacitor unit surrounding said inductor and being concentric therewith, said capacitor unit having a tube of ceramic material of a given thickness and two capacitor sections therein, said capacitor sections having at least one common external electrode for both sections and at least one electrode embedded in each section within said ceramic tube, said embedded electrodes being insulated from each other and from said common electrode whereby the spacing of said embedded electrodes from said common electrode determine the capacitance and the thickness of said ceramic tube is determined primarily by strength considerations; d. said embedded electrodes being connected to separate points on said central conductor, said connection point being on opposite sides of said inductor and forming two terminals for connection; and e. said common electrode constituting a third terminal.

Claim 35

The pi filter as described in claim 29 in which said inductor is a ferrimagnetic material having one turn.

Claim 36

The pi filter as described in claim 29 in which said inductor is a ferromagnetic material having one turn.

Claim 37

The pi filter as described in claim 31 in which said inductor is a metallic wound tape, the winding being insulated and bound together by an electrically insulated binder and said inductor having one turn.

Claim 38

The pi filter as described in claim 31 in which said ferromagnetic inductor comprises at least one of the group consisting of iron, nickel, cobalt and an alloY of at least one of the aforementioned metals.

Claim 39

The pi filter of claim 33 wherein said alloy is one of the group consisting of iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-nickel-molybdenum, iron-nickel-chromium, iron-silicon, iron-aluminum and iron-silicon-aluminum.