Dual-Band Filtering Dielectric Antenna Using High-Quality-Factor Y₃Al₅O₁₂ Transparent Dielectric Ceramic

The Y₃Al₅O₁₂ transparent dielectric ceramic is of permittivity ε_r ≈10.53 and Q × f ≈ 95219 GHz (Q = quality factor = 1/tanδ and f = 7.37 GHz), which is excellent to be applied for the dielectric resonator antenna (DRA). A dual-band filtering DRA (FDRA) is proposed to verify the special dielectric properties of Y₃Al₅O₁₂ transparent dielectric ceramic. The FDRA is designed by seamlessly integrating a dual-band DRA based on rectangular Y₃Al₅O₁₂ transparent ceramic with a quadruple-mode stub-loaded loop resonator (SLLR). The DRA operates at the (Formula presented.) and (Formula presented.) modes excited by a common coupling slot. The SLLR serves as a feeding network, whereas the DRA works as a dual-mode resonator as well as the radiating element. The reflection coefficient, realized gain, and the radiation pattern of the dual-band FDRA are examined. It is observed that the proposed FDRA operates at 3.42 and 5.28 GHz with impedance bandwidths of 5.8% and 4.0%, respectively, which are used for the fifth-generation (5G) network and applications. Good dual-band filtering performance is achieved while realizing radiation efficiency above 84.1% and 85.4% at two bands.