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

• Published in: Advanced engineering materials 2021-08, Vol.23 (8), p.n/a
• Main Authors: Liu, Hai-Wen, Tian, Hong-Liang, Du, Chao, Huang, Tao-Tao, Zhao, Zhen-Yu, Zhou, Di
• Format: Article
• Language: English
• Subjects: dual bands; filtering dielectric resonator antennas; high efficiencies; low losses; transparent dielectric ceramics; yttrium aluminum garnet (Y3Al5O12)
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.202100115

The Y3Al5O12 transparent dielectric ceramic is of permittivity εr ≈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 TE111y and TE113y 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. The transparent Y3Al5O12 dielectric ceramic with high quality factor and relatively high permittivity is excellent to be applied for multifunctional dielectric resonator antenna (DRA). A dual‐band filtering dielectric resonator antenna (FDRA) is fabricated to verify the dielectric properties of the Y3Al5O12 dielectric ceramic. Measured results satisfy the acceptance criteria.