Directional filter using meander lines

Claim 2

A frequency selective directional coupler arrangement comprising an insulating substrate, fast wave transmission line means deposited on one side of said substrate, and slow wave transmission line means deposited on the other side of said substrate and overlying said fast wave transmission line means, said slow wave transmission line means having a predetermined pattern which crosses and recrosses the path of said fast wave transmission line means a plurality of times to provide a desired frequency response on the part of one of said transmission line means to signals applied to the other of said transmission line means, said insulating substrate being sufficiently thin to enable electromagnetic coupling between said fast and said slow transmission line means.

Claim 3

A frequency selective directional coupler arrangement as recited in claim 1 wherein said slow wave transmission line has a helical pattern.

Claim 4

A frequency selective directional coupler arrangement as recited in claim 1 wherein said slow wave transmission line has a meander line pattern.

Claim 5

A frequency selective directional coupler arrangement as recited in claim 1 wherein said fast wave transmission line has the pattern of substantially a straight line.

Claim 6

A frequency selective directional coupler as recited in claim 1 wherein said fast wave transmission line has a curved pattern.

Claim 7

A frequency selective directional coupler arrangement comprising: a fast wave transmission line, and a slow wave transmission line adjacent to, and electromagnetically coupled to said fast wave transmission line, said slow wave transmission line having a regular grid pattern with a symmetrical x axis passing through the center of said grid pattern, and a y axis orthogonal thereto, said fast wave transmission line having a pattern which follows the function y Integral (sin x/x) dx, the paths of said fast and slow wave transmission lines relatively crossing and recrossing one another a plurality of times to provide a desired frequency response on the part of one of said transmission lines to signals applied to the other of said transmission lines.

Claim 8

A frequency selective directional coupler arrangement comprising: a fast wave transmission line, and a slow wave transmission line adjacent to, and electromagnetically coupled to said fast wave transmission line, said slow wave transmission line having a regular grid pattern with a symmetrical x axis passing through the center of said grid pattern, and a y axis orthogonal thereto, said fast wave transmission line having a pattern which follows the function y Integral (sin x/x) dx, the paths of said fast and slow wave transmission lines relatively crossing and recrossing one another a plurality of times to provide a desired frequency response on the part of one of said transmission lines to signals applied to the other of said transmission lines.

Claim 9

A frequency selective directional coupler arrangement comprising: a fast wave transmission line, and a slow wave transmission line adjacent to, and electromagnetically coupled to said fast wave transmission line, said slow wave transmission line having a grid pattern with a symmetrical x axis passing through the center of said grid pattern, and a y axis orthogonal thereto, said grid pattern increasing in size in the direction of said y axis as it extends along said x axis, said fast wave transmission line extending along said x axis, and the paths of said fast and slow wave transmission lines crossing and recrossing one another a plurality of times to provide a desired frequency response on the part of one of said transmission lines to signals applied to the other of said transmission lines.

Claim 10

A frequency selective directional coupler arrangement comprising: a fast wave transmission line, and a slow wave transmission line adjacent to, and electromagnetically coupled to said fast wave transmission line, said slow wave transmission line having a grid pattern with a symmetrical x axis passing through the center of said grid pattern, and a y axis orthogonal thereto, said grid pattern increasing in size in the direction of said y axis as it extends along said x axis, said fast wave transmission line extending along said x axis, and the paths of said fast and slow wave transmission lines crossing and recrossing one another a plurality of times to provide a desired frequency response on the part of one of said transmission lines to signals applied to the other of said transmission lines.

Claim 11

A frequency selective directional coupler arrangement comprising: a first substrate having a flat face, a second substrate having a flat face which is parallel to, and spaced a predetermined distance from the flat face of said first substrate, a fast wave transmission line means deposited on the flat face of said first substrate, a slow wave transmission line means deposited on the flat face of said second substrate opposite to the location of the deposit on said first substrate of said fast wave transmission line means, said slow wave transmission line means having a predetermined pattern which crosses and recrosses the path of said fast wave transmission line means a plurality of times to provide a desired frequency response on the part of one of said transmission line means to signals applied to the other of said transmission line means, and the spacing between said first and second substrates being sufficiently close to enable electromagnetic coupling between said fast and said slow transmission line means.

Claim 12

A frequency selective directional coupler arrangement comprising: a first substrate having a flat face, a second substrate having a flat face which is parallel to, and spaced a predetermined distance from the flat face of said first substrate, a fast wave transmission line means deposited on the flat face of said first substrate, a slow wave transmission line means deposited on the flat face of said second substrate opposite to the location of the deposit on said first substrate of said fast wave transmission line means, said slow wave transmission line means having a predetermined pattern which crosses and recrosses the path of said fast wave transmission line means a plurality of times to provide a desired frequency response on the part of one of said transmission line means to signals applied to the other of said transmission line means, and the spacing between said first and second substrates being sufficiently close to enable electromagnetic coupling between said fast and said slow transmission line means.