Patent ID: 6466180
Filing Date: 2002-10-15
Classification: H01P,H01Q

Abstract:
A matching network for coupling an OEM vehicle antenna comprising antenna mast and base to communications equipment operating at two different frequencies, said network comprising:a) a first transmission line section connected at one end to said antenna; b) a first stub tuner connected to the opposite end of said first transmission line section; c) a second transmission line section connected at one end to the junction of said first transmission line section and said first stub tuner; d) a second stub tuner connected to the opposite end of said second transmission line section; e) and a feedline connected to the junction of said second transmission line section and said second stub tuner for connection to communications equipment operating at two different frequencies; f) the electrical length of each of said first and second transmission line sections is less than one-half wavelength at the lowest operating frequency of the communications equipment and the electrical length of each of said first and second stub tuners is less than one-quarter wavelength at the lowest operating frequency of the communications equipment when the stub tuners have open terminations and between one-quarter wavelength and one-half wavelength at the lowest operating frequency of the communications equipment when the stubs have closed termination; and g) so that operation of the communications equipment at the two frequencies is allowed without any physical modification to the antenna mast and base.