Coaxial connector assembly

A coaxial connector assembly including a first coaxial connector configured such that a first center conductor is held by a first external conductor through a first dielectric body, a second coaxial connector configured such that a second center conductor is held by a second external conductor through a second dielectric body, and a third coaxial connector configured such that a third center conductor is held by a third external conductor through a third dielectric body and configured such that the third coaxial connector is fitted in and connected to the first coaxial connector in a single axial direction through the second coaxial connector,

• wherein the first center conductor is configured such that a first receiving portion configured to receive the second center conductor of the second coaxial connector is formed in a tubular hole shape extending straight in the axial direction, the first external conductor has a first holding portion configured to hold the first center conductor through the first dielectric body and a first fitting portion protruding toward the second coaxial connector with respect to the first dielectric body and the first center conductor in the axial direction and fitted onto one end portion of the second external conductor of the second coaxial connector, and the first fitting portion is formed with a smaller inner diameter than an inner diameter of the first holding portion,
• the second center conductor of the second coaxial connector has a second shaft portion held by the second dielectric body in the second external conductor, a right columnar one-end-side contact portion protruding toward the first coaxial connector with respect to the second dielectric body and the second external conductor in the axial direction and provided at one end portion of the second center conductor on a first coaxial connector side to fit in the first receiving portion of the first coaxial connector, and the other-end-side contact portion formed at the other end portion of the second center conductor on a third coaxial connector side to fit in a third center contact portion provided at one end portion of the third center conductor of the third coaxial connector,
• the second center conductor is configured such that an outer diameter of the one-end-side contact portion is formed larger than an outer diameter of the second shaft portion and a distance in a radial direction between the one-end-side contact portion and the first fitting portion of the first external conductor is impedance-matched to an impedance between the first center conductor and a periphery thereof and an impedance between the second shaft portion of the second center conductor and a periphery thereof,
• the third coaxial connector is configured such that the third external conductor is fitted onto the other end portion of the second external conductor, and
• the first and second coaxial connectors and the second and third coaxial connectors form floating structures relatively movable in the axial direction and the radial direction.