Patent ID: 8219165

Claim:
A radio communication apparatus for conducting a radio communication at a plurality of communication frequencies, comprising: a circuit board arranged in the radio communication apparatus; a first antenna element that conducts a communication at a first frequency band; a first feeding unit provided on the circuit board and connected to the first antenna element, and that feeds communication power to the first antenna element; a first radio unit connected to the first feeding unit, and that conducts a communication: a second antenna element that conducts a communication at a second frequency band different from that of the first antenna element; a second feeding unit provided on the circuit board and connected to the second antenna element, and that feeds communication power to the second antenna element; a second radio unit connected to the second feeding unit, and that conducts a communication; and an antenna grounding unit connected to the second feeding unit, and that connects the second antenna element to the circuit board through an element having predetermined impedance, wherein the second radio unit has a band limiting unit that shuts off the first frequency band and that allows passage of the second frequency band: wherein the antenna grounding unit has a band limiting unit that allows passage of the first frequency band and that shuts off the second frequency band; and wherein the antenna grounding unit regulates a resonance frequency of the second antenna element on a metal plate to the first frequency band.