A non-reciprocal apparatus (10; 50; 110) with multiple ports (12, 14; 52, 54, 56; 112, 114, 116, 118) and sequentially switched delay lines (22a, 22b; 68a, 68b; 128a, 128b), comprising: two transmission line segments (22a, 22b; 68a, 68b; 128a, 128b), configured to operate as sequentially switched delay lines, comprising a first transmission line segment (22a; 68a; 128a) and a second transmission line segment (22b; 68b; 128b) having equal delay times; two active switches (16, 26; 58, 70; 120, 132) comprising: a first active switch (16; 58; 120) comprised of one of a single pole double throw switch and a double pole double throw switch; said first active switch (16; 58; 120) being coupled to proximal ends of said first transmission line segment (22a; 68a; 128a) and second transmission line segment (22b; 68b; 128b), and a second active switch (26; 70; 132) comprised of one of a single pole double throw switch and a double pole double throw switch; said second active switch (26; 70; 132) being coupled to distal ends of said first transmission line segment (22a; 68a; 128a) and second transmission line segment (22b; 68b; 128b); wherein each active switch (16, 26; 58, 70; 120, 132) is configured as at least one port (12, 14; 52, 54, 56; 112, 114, 116, 118) of said apparatus (10; 50; 110); and wherein said two active switches (16, 26; 58, 70; 120, 132) are configured for switching between said two transmission line segments (22a, 22b; 68a, 68b; 128a, 128b) for a selected time duration before they are switched to the other transmission line (22a, 22b; 68a, 68b; 128a, 128b) for the selected time duration, so that said apparatus (10; 50; 110) is configured to sequentially turn on and off said two active switches (16, 26; 58, 70; 120, 132) connected to said transmission line segments (22a, 22b; 68a, 68b; 128a, 128b). two transmission line segments (22a, 22b; 68a, 68b; 128a, 128b), configured to operate as sequentially switched delay lines, comprising a first transmission line segment (22a; 68a; 128a) and a second transmission line segment (22b; 68b; 128b) having equal delay times; two active switches (16, 26; 58, 70; 120, 132) comprising: a first active switch (16; 58; 120) comprised of one of a single pole double throw switch and a double pole double throw switch; said first active switch (16; 58; 120) being coupled to proximal ends of said first transmission line segment (22a; 68a; 128a) and second transmission line segment (22b; 68b; 128b), and a second active switch (26; 70; 132) comprised of one of a single pole double throw switch and a double pole double throw switch; said second active switch (26; 70; 132) being coupled to distal ends of said first transmission line segment (22a; 68a; 128a) and second transmission line segment (22b; 68b; 128b); a first active switch (16; 58; 120) comprised of one of a single pole double throw switch and a double pole double throw switch; said first active switch (16; 58; 120) being coupled to proximal ends of said first transmission line segment (22a; 68a; 128a) and second transmission line segment (22b; 68b; 128b), and a second active switch (26; 70; 132) comprised of one of a single pole double throw switch and a double pole double throw switch; said second active switch (26; 70; 132) being coupled to distal ends of said first transmission line segment (22a; 68a; 128a) and second transmission line segment (22b; 68b; 128b); wherein each active switch (16, 26; 58, 70; 120, 132) is configured as at least one port (12, 14; 52, 54, 56; 112, 114, 116, 118) of said apparatus (10; 50; 110); and wherein said two active switches (16, 26; 58, 70; 120, 132) are configured for switching between said two transmission line segments (22a, 22b; 68a, 68b; 128a, 128b) for a selected time duration before they are switched to the other transmission line (22a, 22b; 68a, 68b; 128a, 128b) for the selected time duration, so that said apparatus (10; 50; 110) is configured to sequentially turn on and off said two active switches (16, 26; 58, 70; 120, 132) connected to said transmission line segments (22a, 22b; 68a, 68b; 128a, 128b).