Flat-type communication cable

A flat-type communication cable for carrying frequencies in excess of 4 MHz comprising:

• a plurality of longitudinally extending conductor passageways, said passageways being positioned side-by-side, the passageways including two end longitudinal conductor passageways and a plurality of side-by-side intermediate conductor passageways,
• each of said passageways having a longitudinally extending opening which opens to an adjacent passageway,
• a plurality of twisted-pair conductors, a different one of said twisted-pair conductors loosely located in each of said passageways with not more than one of said twisted-pair conductors being in each of said passageways;
• each of said twisted-pair conductors having a cross-sectional envelope area less than a cross-sectional envelope area of the passageway in which each twisted-pair conductor is contained;
• at least one of said intermediate passageways has two of said longitudinally extending openings;
• and wherein
• said end passageways consist of a first end passageway and a second end passageway, said first end passageway has a first volume of air, said second end passageway has a second volume of air;
• said intermediate passageways include a first intermediate passageway, said first intermediate passageway has a third volume of air, said first intermediate passageway adjacent to said first end passageway;
• said intermediate passageways include a second intermediate passageway, said second intermediate passageway has a fourth volume of air, said second intermediate passageway adjacent to said second end passageway;
• said first volume of air greater than said third volume of air;
• said second volume of air greater than said fourth volume of air.

A flat-type communication cable for carrying frequencies in excess of 4 MHz comprising:

• a plurality of longitudinally extending conductor passageways, said passageways being positioned side-by-side, the passageways including two end longitudinal conductor passageways and a plurality of side-by-side intermediate conductor passageways;
• each of said passageways having a longitudinally extending opening which opens to an adjacent passageway;
• a plurality of twisted-pair conductors, a different one of said twisted-pair conductors loosely located in each of said passageways with not more than one of said twisted-pair conductors being in each of said passageways;
• each of said twisted-pair conductors having a cross-sectional envelope area less than a cross-sectional envelope area of the passageway in which each twisted-pair conductor is contained;
• and wherein
• at least one of said intermediate passageways has two of said longitudinally extending openings;
• said end passageways consist of a first end passageway and a second end passageway, said first end passageway has a first volume of air, said second end passageway has a second volume of air;
• said intermediate passageways include a first intermediate passageway, said first intermediate passageway has a third volume of air, said first intermediate passageway adjacent to said first end passageway;
• said intermediate passageways include a second intermediate passageway, said second intermediate passageway has a fourth volume of air, said second intermediate passageway adjacent to said second end passageway;
• said first volume of air greater than said third volume of air;
• said second volume of air greater than said fourth volume of air;
• at least one of the twisted-pair conductors is a non-fluorinated polymer insulated twisted-pair conductor;
• and wherein
• one of said longitudinally extending passageways has thicker walls than another of said longitudinally extending passageways having thinner walls;
• the non-fluorinated polymer insulated twisted-pair conductor in said passageway having the thicker walls, the other passageway having the thinner walls containing a fluorinated polymer insulated twisted-pair conductor from said plurality of twisted pairs.

A flat-type communication cable for carrying frequencies in excess of 4 MHz comprising:

• a plurality of longitudinally extending conductor passageways, said passageways being positioned side-by-side, the passageways including two end longitudinal conductor passageways and a plurality of side-by-side intermediate conductor passageways,
• each of said passageways having a longitudinally extending opening which opens to an adjacent passageway,
• a plurality of twisted-pair conductors, a different one of said twisted-pair conductors loosely located in each of said passageways with not more than one of said twisted-pair conductors being in each of said passageways;
• each of said twisted-pair conductors having a cross-sectional envelope area less than a cross-sectional envelope area of the passageway in which each twisted-pair conductor is contained;
• and wherein
• at least one of said intermediate passageways has two of said longitudinally extending openings;
• said end passageways consist of a first end passageway and a second end passageway, said first end passageway has a first volume of air, said second end passageway has a second volume of air;
• said intermediate passageways include a first intermediate passageway, said first intermediate passageway has a third volume of air, said first intermediate passageway adjacent to said first end passageway;
• said intermediate passageways include a second intermediate passageway, said second intermediate passageway has a fourth volume of air, said second intermediate passageway adjacent to said second end passageway;
• said first volume of air greater than said third volume of air;
• said second volume of air greater than said fourth volume of air;
• at least one of the twisted-pair conductors is a non-fluorinated polymer insulated twisted-pair conductor;
• and wherein
• a group of four side-by-side twisted-pair conductors is from said plurality of twisted-pair conductors, each twisted pair from said group of four has two insulated conductors, each twisted pair from said group of four has a center line;
• a distance X is a distance between the center lines of adjacent twisted-pair conductors from said group of four, said distance between the center lines being when the cable is straight;
• each insulated conductor of each twisted pair from said group of four has a diameter of not greater than 0.0395 inches;
• each twisted-pair conductor of said group of four has a twisted-pair lay length of from about 0.4 to about 4.0 inches;
• the relative position of each twisted-pair conductor of said group of four remains within 0.9 times X when the cable has been bent in a semi-circle along a longitudinal axis of the cable, said cable bent around a mandrel measuring 0.3 times the width of the cable;
• and wherein
• each longitudinally extending opening of said plurality of openings forms an arc angle no greater than 70.degree. when the cable is straight;
• one of said longitudinally extending passageways has thicker walls than another of said longitudinally extending passageways which has thinner walls;
• the non-fluorinated polymer insulated twisted-pair conductor is in said passageway having the thicker walls, the other passageway having the thinner walls containing a fluorinated polymer insulated twisted-pair conductor from said plurality of twisted pairs.