Intermediate transition between an antenna and a coplanar waveguide transmission line of a solid state amplifier

An RF feed for a microwave oven having an enclosed cavity, the RF feed comprising:

• an intermediate transition comprising:
• a metal boundary having a first section and a second section having different dimensions than that of the first section;
• a first dielectric disposed in the first section;
• a second dielectric disposed in the second section;
• and
• a center conductor extending from a first side of the metal boundary to a second side of the metal boundary through the first dielectric and the second dielectric, where a first end of the center conductor is connected to an output of a solid state amplifier to receive amplified RF signals therefrom;
• and
• an antenna coupled to a second end of the center conductor for receiving the amplified RF signals and introducing electromagnetic radiation having frequencies and phases of the amplified RF signals into the enclosed cavity.

An RF feed for a microwave oven having an enclosed cavity, the RF feed comprising:

• an intermediate transition comprising:
• a metal boundary having a first section and a second section having different dimensions than that of the first section, wherein the first and second sections have different cross-sectional shapes and different lengths;
• a first dielectric disposed in the first section;
• a second dielectric disposed in the second section, wherein the first and second dielectrics have different dielectric properties;
• and
• a center conductor extending from a first side of the metal boundary to a second side of the metal boundary through the first dielectric and the second dielectric, where a first end of the center conductor is connected to an output of a solid state amplifier to receive amplified RF signals therefrom;
• and
• an antenna coupled to a second end of the center conductor for receiving the amplified RF signals and introducing electromagnetic radiation having frequencies and phases of the amplified RF signals into the enclosed cavity.