Characteristics of J-shaped monopole antenna array with matching circuit at UHF band

A J-shaped monopole antenna array with matching circuits of a slot transmission line was considered for the purpose of development of compact and thin antennas. The return loss was measured to be about more than 10 dB at UHF band. This performance can guarantee the specification of the digital broadcasting at UHF band, and besides, the size of this J-shaped monopole antenna array is reasonably small to be used for such applications because this antenna was made by 1.6mm-thickness dielectric substrate with an area of 91 mm x 62 mm. This antenna will be expected to play a key role for the mobile terminal device for the receiving the digital broadcasting.