Radio frequency modules and modules for moving

A radio frequency module comprising:

• a monolithic microwave integrated circuit portion having an amplifier including at least a field effect transistor, said field effect transistor having a channel region with a junction of two or more different kinds of materials, and height of a potential barrier of a junction interface between the different kinds of materials in said channel region being less than 0.22 eV.

A radio frequency module comprising:

• a monolithic microwave integrated circuit portion including at least a field effect transistor, said field effect transistor comprising a first semiconductor layer containing an impurity;
• and a second semiconductor layer having a smaller band gap than that of the first semiconductor layer, said first semiconductor layer and said second semiconductor layer being joined together to form a heterostructure, said second semiconductor layer containing substantially no impurity, at least said second semiconductor layer forming a channel region, and height of a potential barrier of a junction interface between different kinds of materials in said channel region being less than 0.22 eV.

A module for moving target detection comprising:

• monolithic microwave integrated circuits on a single substrate which include at least an oscillator, an amplifier, and a receiver, at least one of said oscillator, said amplifier, and said receiver including a field effect transistor having a channel region with a junction of two or more different kinds of materials.