Low-profile dual-mode plate-loop antenna

This paper presents an electrically small and low profile plate loop antenna with dual inverted-F resonant modes for mobile satellite communication systems in the VHF band. The proposed antenna consists of a feed element and a parasitic element for dual mode operation. A square patch element attached to an inner loop provides the function to adjust the frequency of higher resonant mode. Its dominant mode is explained by loop-element inverted-F shaped antenna, and the second mode is given by a parasitic loop-element. A prototype plate loop antenna is demonstrated to have dual mode resonances in the VHF band, and measured antenna characteristics are also presented.