Patent ID: 7622932

Claim:
A measuring apparatus that measures a characteristic of a device under measurement, comprising: a measuring signal generating section that outputs a forward signal to the device under measurement through a device side terminal; a directional coupler that outputs a backward split signal obtained by splitting a part of a backward signal inputted from the device under measurement through the device side terminal; a backward mixer that outputs a backward detection signal obtained by multiplying a local signal having a predetermined frequency by the backward split signal; and an analysis section that analyzes a characteristic of the device under measurement based on the backward detection signal, wherein the directional coupler is included in a multilayer substrate, the backward mixer is included in a chip provided on a surface of the multilayer substrate, a concave portion is formed on a surface of the multilayer substrate, the chip is disposed on a bottom surface of the concave portion, the measuring apparatus further comprises a conductive lid portion that covers the concave portion, the multilayer substrate further includes a ground pattern formed under the chip, and the ground pattern and the conductive lid portion are electrically connected so as to surround the chip.