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Semiconductor device having waveguide-coaxial line transformation structure

  • US 4,868,639 A
  • Filed: 08/10/1987
  • Issued: 09/19/1989
  • Est. Priority Date: 08/11/1986
  • Status: Expired due to Term
First Claim
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1. A semiconductor device, comprising:

  • a metal base of a package, having a hole passing through a base;

    a semiconductor circuit element mounted on the base;

    a cap of the package air-tightly fixed to the base for sealing the circuit element within the package;

    a metal terminal for waveguide-coaxial line transformation, passing through the hole of the base and having an inner end portion at which the terminal is electrically connected to the circuit element, a central transformation portion in the hole of the base, and an outer antenna portion extending toward the outside of the package; and

    a dielectric spacer between the terminal and the base, the terminal being air-tightly fixed directly to the base by the dielectric spacer;

    wherein the hole of the base, the dielectric spacer, and the central transformation portion of the terminal are formed so as to satisfy the following formula;

    ##EQU2## where Z0 is a required inherent impedance of a characteristic frequency, ε

    is a dielectric constant of the dielectric spacer, d1 is a diameter of the central transformation portion of the terminal and d2 is a diameter of a portion, enclosing the central transformation portion of the terminal of the hole of the base, such that said members act as a required waveguide-coaxial line transformer.

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