Patent ID: 7239222

Claim:
A high frequency circuit module comprising: RF circuit parts mounted on one side of a first dielectric substrate on which other side a first grounding conductive layer is provided; an antenna formed by a second dielectric substrate, a first metallic pattern mounted on one side of the second dielectric substrate and a second grounding conductive layer provided on the other side of the second dielectric substrate; a third dielectric substrate located between the first dielectric substrate and the second dielectric substrate; a first transmission line connecting said RF circuit parts and the antenna and second transmission lines for transmitting an intermediate frequency signal of the RF circuit parts and for providing power to the RF circuit parts, through a third grounding conductive layer located in the third dielectric substrate, wherein the RF circuit parts include an oscillation circuit, a power amplifier configured to amplify a part of an output of said oscillation circuit and supply the amplified output to said antenna, and a mixer configured to mix a signal from said antenna with a signal of the oscillation circuit, the first transmission line has a microstrip transmission line and a coaxial structure transmission line connected to the microstrip transmission line, the microstrip transmission line is composed by the first dielectric substrate, the first grounding conductive layer and a second metallic pattern of which one end is connected with the RF circuit parts, and of which other end is connected with the coaxial structure transmission, and the coaxial structure transmission line has a center conductor and a group of vias surrounding the center conductor, and said group of vias is arranged so that a plurality of vias are distributed around the center conductor at an interval which is equal to or smaller than ¼ wavelength of a signal of said first transmission line, and one end portions of said group of vias are connected with the first grounding conductive layer, and other end portion of said group of vias are connected with the second grounding conductive layer.