Heejun Park

Metamaterial-embedded beamforming phased-array antennas for degradable GPS links

This paper presents an approach to enable a typical GPS receiver to be much less susceptible to intentional disruption such as jamming and change in link environment. Beamforming GPS receivers comprising 4×4 elements or 8×8 ones are designed using metamaterials, for the placement on the body of an aircraft as an airborne vehicle, to cope with the varying angle of incidence with good antenna gain and the low inter-element interference to make the system more robust and adaptive. The design results show the antenna gain much higher than 5 dBi, and the movable circularly polarized beam with the excellent axial ratio at the resonance frequency and low mutual coupling between the elements.

Low-SAR metasurface-based dipole and its beamforming array

This paper suggests a new planar metamaterial-based dipole with a low SAR. The artificial magnetic conductor(AMC) lies below the dipole through a thin AMC to prevent a high SAR as well as secure a good impedance match, which will become poor near the human tissue by the conventional techniques. The design is conducted for 2.4 GHz WBAN frequency, and shows the strengths at volume miniaturization, return loss and SAR. Also, this method is extended to the beamforming characteristics in an array configuration aiming to build adaptive wearable equipment