Microwave transmission line termination

Claim 2

A stripline transmission line for use as a power dissipating termination, said line comprising a pair of parallel metallic ground planes, a center conductor positioned parallel to said ground planes and substantially midway therebetween, a low-loss dielectric material between said ground planes and said center conductor for at least a portion of the length of said center conductor, and a high-loss dielectric material between said ground planes and said center conductor for the remainder of the length of said center conductor so that the juncture between said dielectric materials lies in a plane perpendicular to said center conductor and so that said remainder of the length of said center conductor has an effective electrical length l in accordance with the expression when the end of said line is short circuited and when the end of said line is open circuited, where Zin the characteristic impedance of said portion of said line containing said low-loss dielectric material; Zo the characteristic impedance of said remainder of said line containing said high-loss dielectric material; and gamma the propagation constant of the line with said highloss dielectric material.

Claim 3

An energy absorbing termination for one end of a transmission line having a relatively lossless dielectric between two parallel conductors, said termination comprising energy absorbing dielectric material replacing said relatively lossless dielectric material along a length of said line preceding said end of said line so that the juncture between said dielectric material lies in a plane perpendicular to said conductors and, furthermore, so that the portion of said line including said energy absorbing dielectric has an effective electrical length l in accordance with the expression when said end of said line is short circuited and when said end of said line is open circuited, where Zin the characteristic impedance of said line containing said relatively lossless dielectric material; Zo the characteristic impedance of said portion of said line containing said energy absorbing dielectric material; and gamma the propagation constant of said line with said energy absorbing dielectric material.

Claim 4

An energy absorbing termination for one end of a transmission line having a relatively lossless dielectric between two parallel conductors, said termination comprising energy absorbing dielectric material replacing said relatively lossless dielectric material along a length of said line preceding said end of said line so that the juncture between said dielectric material lies in a plane perpendicular to said conductors and, furthermore, so that the portion of said line including said energy absorbing dielectric has an effective electrical length l in accordance with the expression when said end of said line is short circuited and when said end of said line is open circuited, where Zin the characteristic impedance of said line containing said relatively lossless dielectric material; Zo the characteristic impedance of said portion of said line containing said energy absorbing dielectric material; and gamma the propagation constant of said line with said energy absorbing dielectric material.

Claim 5

Means for absorbing the energy at the end of a microwave transmission line having inner and outer parallel conductors, said means comprising high-loss dielectric material in the portion of said line immediately preceding said end with the innermost surface of said material lying in a plane perpendicular to said center conductor and said center conductor encased by said material for an effective electrical length l defined by the expression when said end of said line is short circuited and when said end of said line is open circuited, where Zin the characteristic impedance of the portion of said line not containing said high-loss dielectric material; Zo the characteristic impedance of said portion of said line containing said high-loss dielectric material; and gamma the propagation constant of said line with said high-loss dielectric material.

Claim 6

Means for absorbing the energy at the end of a microwave transmission line having inner and outer parallel conductors, said means comprising high-loss dielectric material in the portion of said line immediately preceding said end with the innermost surface of said material lying in a plane perpendicular to said center conductor and said center conductor encased by said material for an effective electrical length l defined by the expression when said end of said line is short circuited and when said end of said line is open circuited, where Zin the characteristic impedance of the portion of said line not containing said high-loss dielectric material; Zo the characteristic impedance of said portion of said line containing said high-loss dielectric material; and gamma the propagation constant of said line with said high-loss dielectric material.

Claim 7

A microwave transmission line termination comprising a microwave transmission line segment having inner and outer parallel conductors, coupler means connected to one end of said line segment, and high-loss dielectric material in the portion of said line segment preceding its other end with the innermost surface of said material lying in a plane perpendicular to said center conductor and said center conductor encased by said material for an effective electrical length l defined by the expression when said other end of said line segment is short circuited and when said other end of said line segment is open circuited, where Zin the characteristic impedance of the portion of said line segment not containing said high-loss dielectric material; Zo the characteristic impedance of said portion of said line segment containing said high-loss dielectric material; and gamma the propagation constant of said line with said high-loss dielectric material.

Claim 8

A microwave transmission line termination comprising a microwave transmission line segment having inner and outer parallel conductors, coupler means connected to one end of said line segment, and high-loss dielectric material in the portion of said line segment preceding its other end with the innermost surface of said material lying in a plane perpendicular to said center conductor and said center conductor encased by said material for an effective electrical length l defined by the expression when said other end of said line segment is short circuited and when said other end of said line segment is open circuited, where Zin the characteristic impedance of the portion of said line segment not containing said high-loss dielectric material; Zo the characteristic impedance of said portion of said line segment containing said high-loss dielectric material; and gamma the propagation constant of said line with said high-loss dielectric material.

Claim 9

A stripline transmission line for use as a power dissipating termination, said line comprising a center conductor, a low-loss dielectric material having a rectangular cross section and surrounding said center conductor for at least a portion of the length of said center conductor, a high-loss dielectric material having a rectangular cross section and surrounding said center conductor for the remainder of the length of said center conductor so that the juncture between said dielectric materials lies in a plane perpendicular to said center conductor, and ground planes parallel to said center conductor and immediately adjacent to said dielectric material, said high-loss dielectric material surrounding said center condUctor for a length to effect an electrical length l in accordance with the expression when the end of said line is short circuited and when the end of said line is open circuited, where Zin the characteristic impedance of said portion of said line containing said low-loss dielectric material; Zo the characteristic impedance of said remainder of said line containing said high-loss dielectric material; and gamma the propagation constant of said line with said high-loss dielectric material.

Claim 10

A stripline transmission line for use as a power dissipating termination, said line comprising a center conductor, a low-loss dielectric material having a rectangular cross section and surrounding said center conductor for at least a portion of the length of said center conductor, a high-loss dielectric material having a rectangular cross section and surrounding said center conductor for the remainder of the length of said center conductor so that the juncture between said dielectric materials lies in a plane perpendicular to said center conductor, and ground planes parallel to said center conductor and immediately adjacent to said dielectric material, said high-loss dielectric material surrounding said center condUctor for a length to effect an electrical length l in accordance with the expression when the end of said line is short circuited and when the end of said line is open circuited, where Zin the characteristic impedance of said portion of said line containing said low-loss dielectric material; Zo the characteristic impedance of said remainder of said line containing said high-loss dielectric material; and gamma the propagation constant of said line with said high-loss dielectric material.