| 摘要 |
Disclosed is a waveguide type rat-race circuit capable of being used suitably in a high-frequency region; further disclosed is a mixer using said circuit. This waveguide type rat-rate circuit is equipped with a circular waveguide part (30) that is provided with first-fourth ports (11-14) and that is partitioned into a first waveguide part (21) which connects the first and second ports, a second waveguide part (22) which connects the second and third ports, a third waveguide part (23) which connects the third and fourth ports, and a fourth waveguide part (24) which connects the fourth and first ports. The amount of phase shift of the first-third waveguide parts is (2n+1)&pgr;/2, and the difference between the sum of the amounts of phase shift of the first-third waveguide parts and the amount of phase shift of the fourth waveguide part is 2(m−1)&pgr;. This waveguide type rat-rate circuit is capable of being used suitably in a high-frequency region.
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