PURPOSE: To simultaneously use a print antenna at plural frequencies by providing respectively specified dielectric substrate, resonance circuit and ground substrate.

CONSTITUTION: This print antenna is provided with a dielectric substrate 1a forming a conductor pattern 10 to be resonated at a first frequency, resonance circuit 11 inserted into the intermediate part of the conductor pattern 10 so as to be resonated at a second frequency, and ground substrate 1b vertically arranged on the dielectric substrate 1a. The conductor pattern 10 is separated into first and second antenna elements 10a and 10b by the resonance circuit 11 and respectively function as the ground plane antennas of 1/4λ. Since the resonance circuit 11 is resonated to the second frequency, it is equivalent with the state of opening the first antenna 10a to the second frequency and by setting its length L2 so as to resonate to second antenna element 10a at the second frequency, this print antenna is resonated at the second frequency. Since the conductor pattern 10 is resonated to the first frequency, this print antenna can be used as a two-frequency sharing antenna.