Patent ID: 7477118

Claim:
A high frequency device mounting substrate comprising: a circuit board having a conductor layer on a reverse surface or an inner part of an insulator layer; a plurality of terminal electrodes located on a surface of the circuit board for connecting to terminals of a high frequency device; a plurality of signal lines located on the surface of the circuit board and respectively connecting with the terminal electrodes; and a ground conductor layer located on the surface of the circuit board, wherein a gap between the signal line and the ground conductor layer is larger than a distance between the signal line and the conductor layer formed on the reverse surface or the inner part of the insulator layer, and the signal lines respectively radially extending from the terminal electrodes, wherein a straight line that is a virtual extension of the one arbitrary signal line from the terminal electrode and a straight line that is a virtual extension of the other one arbitrary signal line from the terminal electrode not constituting a same straight line.