This technology is a UHF wideband antenna that connects a feed to a wine-glass-shaped radiator, which widens from one end to the other, and integrates an open-ended stub band-stop filter that acts as a metamaterial phase shifter. Parasitic elements are placed on the sides and back of the radiator to reinforce the low-frequency band.
Widely used wideband monopole antennas are tuned to high bands of 3.2–10.8 GHz, making them difficult to use in the 700 MHz UHF band. Methods such as cutting U- or Y-shaped slits into the radiator or attaching quarter-wave stubs to prevent unwanted band interference have limitations, including increased filter size and degraded antenna radiation performance.
This technology secures a 700 MHz–1.3 GHz wideband using a tapered radiator with four edges of varying tilt angles and parasitic elements that compensate for the insufficient capacitance of thin-film substrates. The lumped-element-based metamaterial stub filter is compact, filtering out only interference frequencies at the feed without affecting the radiator. Applicable to digital broadcast receivers, public safety networks, and RFID readers, it solves low-frequency wideband reception and noise blocking in a single compact antenna.
This invention was developed with support from the Ministry of Science, ICT and Future Planning for the development of a cloud-based SW platform for RF design and EM analysis.
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