Ultrahigh- <em>Q</em> Sr <sub>1+ <em>x</em> </sub>Y <sub>2</sub>O <sub>4+ <em>x</em> </sub> <em />( <em>x</em>= 0.01&amp;ndash;0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas
Journal of advanced ceramics