Patent ID: 6259930
Filing Date: 2001-07-10
Classification: H01Q,H03H

Abstract:
An antenna circuit for a portable telephone, comprising:an RF (Radio Frequency) module having an impedance of about 50.OMEGA.;an antenna having an impedance of about 450 to 500.OMEGA., for radiating an RF signal output from said RF module into the air and outputting an RF signal captured from the air to said RF module; anda matching circuit connected between said RF module and said antenna to match an impedance characteristic of said RF module with an impedance characteristic of said antenna, wherein said matching circuit includes an inductor having an inductance of about 24 mH directly connected between an output of said RF module and said antenna and a capacitor having a capacitance of about 1 pF directly connected between said antenna and a ground, said capacitor being coupled in parallel to only said inductor.