High frequency helical filter

Claim 2

A high frequency helical electro-magnetic wave filter comprising a conductive casing containing: an input coupling helix; an output coupling helix; a plurality of resonance helixes spaced from said casing and coaxially aligned in tandem and separated from each other end-to-end and each having an electrical length of n lambda /4 and the electrical length of said plurality being N lambda /2, the first of said resonance helixes in the tandem being physically and conductively separated from, but coupled with, said input helix and the last of said resonance helixes in the tandem being physically and conductively separated from, but coupled with, said output helix, each of said resonance helixes being conductively connected to the casing at one of its ends which is at the distance from the end of the first resonance helix which is coupled with said input helix, which has an electrical length of (2m-1) lambda /4, wherein m, n and N are positive integers and lambda represents the length of an electro-magnetic wave being filtered, said couplings to the input helix and to the output helix being capacitive couplings.

Claim 3

A high frequency helical electro-magnetic wave filter comprising a conductive casing containing: an input coupling helix; an output coupling helix; a plurality of resonance helixes spaced from said casing and coaxially aligned in tandem and separated from each other end-to-end and each having an electrical length of n lambda /4 and the electrical length of said plurality being N lambda /2, the first of Said resonance helixes in the tandem being physically and conductively separated from, but coupled with, said input helix and the last of said resonance helixes in the tandem being physically and conductively separated from, but coupled with, said output helix, each of said resonance helixes being conductively connected to the casing at one of its ends which is at the distance from the end of the first resonance helix which is coupled with said input helix, which has an electrical length of (m-1) lambda /2, wherein m, n and N are positive integers and lambda represents the length of an electro-magnetic wave being filtered, said couplings to the input helix and to the output helix are inductive couplings.

Claim 4

A high frequency helical electro-magnetic wave filter comprising a conductive casing containing: an input coupling helix; an output coupling helix; a plurality of resonance helixes spaced from said casing and coaxially aligned in tandem and separated from each other end-to-end and each having an electrical length of n lambda /4 and the electrical length of said plurality being N lambda /2, the first of Said resonance helixes in the tandem being physically and conductively separated from, but coupled with, said input helix and the last of said resonance helixes in the tandem being physically and conductively separated from, but coupled with, said output helix, each of said resonance helixes being conductively connected to the casing at one of its ends which is at the distance from the end of the first resonance helix which is coupled with said input helix, which has an electrical length of (m-1) lambda /2, wherein m, n and N are positive integers and lambda represents the length of an electro-magnetic wave being filtered, said couplings to the input helix and to the output helix are inductive couplings.

Claim 5

A high frequency helical filter according to claim 2 in which there is an interspace between each helix and the next adjacent helix and which further includes means for adjusting coupling occurring in at least one of said interspaces.

Claim 6

A helical filter according to claim 1 in which there is an interspace between each helix and the next adjacent helix and which further includes means for adjusting coupling occurring in at least one of said interspaces.

Claim 7

A high frequency helical electro-magnetic wave filter comprising a conductive casing divided into a plurality of cavities electrically shielded from each other; a plurality of first coupling helixes the number of which is the same as the number of said cavities and each of which is connected at one end to a respective one of the cavities; a plurality of second coupling helixes; a plurality of resonance helix assemblies, the number of which is the same as the number of cavities, each assembly comprising a plurality of resonance helixes located in a respective one of the cavities and spaced from said casing and coaxially aligned in tandem and separated from each other end-to-end and each resonance helix having an electrical length of n lambda /4, the electrical length of each assembly being (2N-1) lambda /4, the first resonance helix in the tandem of each assembly being capacitively coupled with the corresponding one of the first coupling helixes, each of said plurality of resonance helixes being conductively connected to said casing at one of its ends which is at the distance from the end of the first resonance helix which is capacitively coupled with the first coupling helix, which has an electrical length of (2m-1) lambda /4, the last resonance helix in the tandem of each assembly being inductively coupled with the corresponding one of said second coupling helixes, wherein m, n and N are positive integers and lambda represents the length of an electro-magnetic wave being filtered.

Claim 8

A high frequency helical electro-magnetic wave filter comprising a conductive casing divided into a plurality of cavities electrically shielded from each other; a plurality of first coupling helixes the number of which is the same as the number of said cavities and each of which is connected at one end to a respective one of the cavities; a plurality of second coupling helixes; a plurality of resonance helix assemblies, the number of which is the same as the number of cavities, each assembly comprising a plurality of resonance helixes located in a respective one of the cavities and spaced from said casing and coaxially aligned in tandem and separated from each other end-to-end and each resonance helix having an electrical length of n lambda /4, the electrical length of each assembly being (2N-1) lambda /4, the first resonance helix in the tandem of each assembly being capacitively coupled with the corresponding one of the first coupling helixes, each of said plurality of resonance helixes being conductively connected to said casing at one of its ends which is at the distance from the end of the first resonance helix which is capacitively coupled with the first coupling helix, which has an electrical length of (2m-1) lambda /4, the last resonance helix in the tandem of each assembly being inductively coupled with the corresponding one of said second coupling helixes, wherein m, n and N are positive integers and lambda represents the length of an electro-magnetic wave being filtered.

Claim 9

A high frequency helical wave filter comprising a conductive casing having within it: a first coupling helix, a resonance helix assembly comprising a plurality of resonance helixes spaced from said casing and axially aligned with each other and separated end-to-end and each having an electrical length of n lambda /4, the length of said assembly being (2N-1) lambda /4; and a secondd coupling helix spaced from said assembly, the first helix of said resonance helix assembly being capacitively coupled with said first coupling helix, each of said plurality of resonance helixes being conductively connected at one of its ends to said casing, the point of said conductive connection of each resonance helix being spaced by an electrical length of (2m-1) lambda /4 from that end of the first resonance helix which is capacitively coupled with said first coupling helix; the last resonance helix of the resonance helix assembly being inductively coupled with said second coupling helix, wherein m, and N are positive integers and lambda represents the length of a electromagnetic wave being filtered.

Claim 10

A high frequency helical wave filter comprising a conductive casing having within it: a first coupling helix, a resonance helix assembly comprising a plurality of resonance helixes spaced from said casing and axially aligned with each other and separated end-to-end and each having an electrical length of n lambda /4, the length of said assembly being (2N-1) lambda /4; and a secondd coupling helix spaced from said assembly, the first helix of said resonance helix assembly being capacitively coupled with said first coupling helix, each of said plurality of resonance helixes being conductively connected at one of its ends to said casing, the point of said conductive connection of each resonance helix being spaced by an electrical length of (2m-1) lambda /4 from that end of the first resonance helix which is capacitively coupled with said first coupling helix; the last resonance helix of the resonance helix assembly being inductively coupled with said second coupling helix, wherein m, and N are positive integers and lambda represents the length of a electromagnetic wave being filtered.

Claim 11

A filter according to claim 6 in which there is an interspace between each of said helixes and the helix next adjacent and there is means for adjusting coupling occurring in at least one of said interspaces.