A connector comprises a coaxial connector and a metallic plate. The coaxial connector has an outer conductor, a dielectric material, a mounting wall, and a center conductor. The space between the two conductors is filled with the dielectric material. The center conductor is extended from the inside of the coaxial connector to the other side of the mounting wall. The metallic plate has a through hole and is attached to the mounting wall of the coaxial connector. The outside center conductor of the coaxial connector is placed within the through hole. Hence, the connector improves the transmission passband of the transition between a coaxial line and a microstrip line at high frequencies.
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