Patent ID: 7362576

Claim:
A radio frequency module for wireless communication, the radio frequency module comprising: a first chip forming a heater element; a second chip forming a device whose operating characteristics vary with temperature change or whose maximum operating temperature is lower than the maximum operating temperature of the first chip; and a multilayer substrate which is comprised of a plurality of dielectric layers and a plurality of conductor layers and mechanically supports the first chip and the second chip with some of the conductor layers electrically connected with the first and second chips, wherein the first chip is located on a first conductor pattern made on a first one of said plurality of conductor layers which is provided on the top face of the multilayer substrate or on a second one of said plurality of conductor layers which is not on the top face of the multilayer substrate; wherein the second chip is located on a second conductor pattern made on said first conductor layer or on a said second conductor layer; wherein the module has at least one of the following means: means for conducting the heat generated by the first chip throughout the module; means for guiding the heat generated by the first chip from the module's top face side to its bottom face side; and means for interrupting heat conduction from the first conductor pattern to the second conductor pattern, wherein the multilayer substrate is fixed on another substrate with its bottom face in contact with the other substrate; and wherein the means for guiding the heat generated by the first chip from the module's top face side to its bottom face side conducts the heat through via holes which at least connect the first conductor pattern and the bottom face of the module, and through via holes which connect the bottom face of the module and a part of at least one of the following conductors: a third conductor pattern electrically connected with the first conductor pattern, the second conductor pattern and a fourth conductor pattern electrically connected with the second conductor pattern.